169results about How to "Inhibits hydration swelling" patented technology

The invention relates to foam liquid for drilling, in particular to strong inhibition type anti-collapse foam liquid for drilling, which is characterized by being prepared with the following components in parts by weight: 0.09-0.11 part of foam stabilizer, 0.36-0.44 part of foaming agent, 2.34-2.86 parts of anti-collapse agent, 2.7-3.3 parts of fluid loss additive and 94.51-93.29 parts of water. When complex situations such as formation water occur to gas drilling, the foam liquid of the invention can effectively improve the rock carrying capacity and the water carrying capacity and simultaneously protect the stability of the upper well wall. Laboratory studies shown that the foam liquid has high foaming capacity, the foaming capacity is more than or equal to 500 percent, the half-life is moderate, and the foam liquid can be easily controlled and is conducive to drilling engineering construction.

The invention discloses a high-temperature resistant polymer viscosity reducer for drilling fluid and a preparation method thereof. The polymer viscosity reducer is a copolymer generated by olefine acid, olefine sulfoacid, olefine acid ester and alkenyl quaternary ammonium through chemical reaction, molecules of the copolymer contain 5 to 60 structural units, and viscosity average molecular weight is 2,500 to 30,000. The polymer viscosity reducer can resist temperature of more than 245 DEG C in the drilling liquid, and effectively disperse a grid structure of the drilling liquid, has good viscosity reduction effect in fresh water, aggravated fresh water and a calcium chloride and sodium chloride composite saline water drilling fluid, and can simultaneously inhibit hydration and swelling of clay and reduce filtration loss.

The invention relates to a polymer clay stabilizer containing Beta-cyclodextrin structure and a synthesis method thereof, wherein the polymer clay stabilizer is used for restraining clay hydration swelling of an oil well. The technical scheme is as follows: the polymer clay stabilizer comprises the following materials and monomers in percentage by mass: 35-54.8% of acrylamide AM, 15-25% of sodium acrylate NaAA, 8-20% of 2-acryloyl-methyl-propyl sulfonate AMPS, and 0.2% of 2-O (propenyloxy-2-hydroxy-propyl)-Beta-cyclodextrin XBH; 0.02g of XBH and 2g of AMPS are added into a flask, and then 5.48g AM, 1.915g of AA and 0.585 g of NaOH are added into the flask, so a water solution with the monomer mass percentage concentration of 20% is prepared, and nitrogen is introduced into the water solution for 20 min; (NH4)2S2O8 solution and NaHSO3 solution are then added into the water solution while nitrogen is continuously introduced into the water solution for 10-20 min, and reaction is carried out at the temperature of 35 DEG C for 4-12 hours; and finally, the reacted solution is subjected to washing with absolute ethyl alcohol, smashing and drying to obtain AM / NaAA / AMPS / XBH quaternary polymer. The polymer clay stabilizer has good water solubility, viscosifying capacity, temperature resistance, salt resistance, anti-shearing capacity and clay-swelling restraining capacity, and reaches the swelling prevention rate of 84.37% towards sodium-montmorillonite.

The invention discloses a compound type vegetable oil lubricating agent for a drilling fluid and a preparation method thereof. The compound type vegetable oil lubricating agent for the drilling fluid with favorable oiliness, no toxicity, low fluorescent level and favorable bearing and thermostabilized performance is prepared by taking a vegetable oil leftover which is low in price and easy to obtain, lauryl sodium sulfate, sbane 80, sodium carboxymethylcellulose, polyvinylpyrrolidone and the like as main raw materials, adding a solid lubricating agent which is graphite or serpentine and usinga simple and environment-friendly production method, so that not only the production cost is greatly reduced, but also any toxic and harmful action on the environment is not generated in the production process. The compound type vegetable oil lubricating agent for the drilling fluid is not only applied to drilling, but also can be applied to producing wells, can effectively inhibit the hydrous expansion of mud shale, consolidate the well wall and prevent the sticking accidents and is especially suitable for industrial production on a large scale.

The invention discloses an auxiliary leaching agent applied to the ion-absorbed rare earth ore leaching process and an ore leaching method of the auxiliary leaching agent. The auxiliary leaching agent is a water-soluble surface active agent. Ore leaching liquid prepared through mixing of a leaching agent and the auxiliary leaching agent is used for leaching ion-absorbed rare earth ore, stable rare earth complex can be formed, moistening of the surface of soil is facilitated, and the leaching effect is strengthened. Meanwhile, due to the adding of the auxiliary leaching agent in the ore leaching liquid, clay hydration expansion and particle transferring can be effectively inhibited, and the effect of soil expansion preventing is achieved. The auxiliary leaching agent is used in the ion-absorbed rare earth ore leaching process, the rare earth leaching rate is increased, the use amount of the leaching agent is reduced, production cost is reduced, and ammonia nitrogen pollution is reduced; and in addition, the function of preventing soil expansion is achieved, and the probability of landslides is reduced.

The invention discloses environmentally-friendly high-temperature-resistant synthetic base foam drilling fluid and a preparation method thereof. The drilling fluid comprises the following components in parts by weight: 1-3 parts of organic soil, 1-2 parts of high-temperature oil-based foaming agent, 1-3 parts of self-made high-temperature oil-based foam stabilizer and 92-97 parts of synthetic base liquid namely alpha-olefin. The dispersion medium of the synthetic base foam drilling fluid is foam liquid using alpha-olefin as the main component, the dispersed phase is air, and the drilling fluid is prepared through high-speed stirring. The drilling liquid system has stable performance, good heat resistance and antipollution capability and good compatibility to the reservoir; and the drilling fluid can be used in deep well underbalanced drilling and can be used to effectively inhibit the hydration and expansion of the shale, stabilize the well wall, prevent well leakage and protect the oil and gas formation. In addition, the synthetic base liquid namely alpha-olefin and the foaming agent are both non-toxic, are biodegradable and have no harmful effect on the environment.

The invention discloses a polymer-ionic liquid compounded clay stabilizer and a synthesis method thereof. The method comprises the following steps of copolymerizing (1-dimethylamino)-allyl phosphate containing phosphoric groups, acrylic acid and acrylamide, so as to obtain a terpolymer AA / AM / DMAAPA, preparing 100mL of aqueous solution with the mass concentration of 10,000mg / L from the AA / AM / DMAAPA, putting into a 250mL round-bottomed flask, adding 0.3g of ionic liquid [EMIM]BF4, introducing N2 for 10-20 minutes, carrying out reflux reaction for 2-4 hours at the temperature of 50 DEG C, and after the reaction is ended, carrying out reduced-pressure distillation on a reaction solution at the temperature of 50 DEG C until a gelatinous product is produced; drying the product in a baking oven with the temperature of 60 DEG C for 12 hours, thereby obtaining a polymer-ionic liquid compound AA / AM / DMAAPA-[EMIM]BF4. The polymer-ionic liquid compounded clay stabilizer synthesized by the method is intended to be applied to oilfield development and is used for inhibiting the hydrated expansion of clay.

The invention discloses a high-temperature resistant clay stabilizer and a preparation method thereof. The preparation method comprises the following steps: carrying out initiation reaction on epoxy chloropropane, dimethylamine and unsaturated quaternary ammonium salt with a sulfonate-containing anionic monomer under a certain condition; and then adding a chain transfer agent in the reaction process to control the molecular weight and after reaction, obtaining the clay stabilizer, wherein both the main and side chains contain cations and the side chain further contains anions. The clay stabilizer has the abilities of resisting temperature, preventing salt and resisting pollution; the clay stabilizer is small in use level, scouring resistant and good in anti-swelling effect; and the molecular weight is ranged from 1500 to 6000, so that the high-temperature resistant clay stabilizer is suitable for a low permeability reservoir.

The invention discloses a gas self-production agent, a use of the gas self-production agent, and a self-produced gas foam acidizing method for oil wells and water wells. The gas self-production agent can produce gas in an acid environment or at an oil well bottom temperature. An active ingredient of the gas self-production agent is ammonium carbamate. The gas self-production agent has the advantages of low requirement on gas production conditions, large gas yield, simplification of foam acidizing processes for oil wells and water wells, reduction of a foam acidizing cost, and improvement of acidizing effects.

The invention relates to an anti-collapse plugging agent for drilling fluids, and a preparation method thereof, and a drilling fluid, and belongs to the technical field of oil field drilling fluids. According to the present invention, the anti-collapse plugging agent is selected from a chitosan nano-gel, wherein the chitosan nano-gel has an average particle size (D50) of 50-500 nm, has a zeta potential of 0 to +50 mV, and is prepared by a method selected from a chemical cross-linking method, an ion gel method, a precipitation method and an emulsion drop aggregation method; the use amount of the anti-collapse plugging agent for drilling fluids is 0.1-5 parts by weight, preferably 1-2 parts by weight, by using the water in a drilling fluid as 100 parts by weight; the chitosan nano-gel micro-particles can be deformed, and are positively charged on the surface, such that the chitosan nano-gel micro-particles are easily squeezed into the micro-nano pores and micro-cracks of mud shale underthe action of downhole pressure difference so as to provide the effective anti-collapse plugging effect; and the drilling fluid can be used in various oil-gas wells such as straight wells, directionalwells, large displacement wells, horizontal wells and the like.

The invention discloses slick water applied to shale gas industrialized fracturing exploitation and a preparation method thereof, and solves the problems of long period of fracturing construction and high cost of the existing slick water due to long liquid preparation time and high liquid preparation requirements. The slick water provided by the invention includes 0.05%-0.1% of an emulsion resistance reducing agent, 0.1%-0.2% of a fungicide, 0.1%-0.2% of a clay stabilizer, 0.09%-0.11% of a cleanup agent and the balance of water. The formula of the invention is reasonable in design, the emulsion resistance reducing agent dissolves and glues rapidly and has strong salt resistance, so as to not only greatly shorten the cycle of fracturing construction but also reduce the construction cost to meet the requirements for shale gas industrialized fracturing exploitation. The invention has the advantages of simple process, wide source of raw materials, and high application value and promotion value.

The invention relates to a formula for a strong inhibitive high-density salt resistance drilling fluid capable of resisting the temperature of 220 DEG C and a preparation method of the drilling liquid; in the formula, a high-temperature salt resistant viscosity enhancer is a silicate modified matter, a fluid loss reducer A and a fluid loss reducer B are main chains which are carbon-carbon chains; branched chains are products of sulfonic group, pyrrolidone group and alkane group; an inhibitive anti-sloughing agent is modified natural plant asphalt derivative with high softening point; an inhibitive lubricating agent is a macromolecule non-ionic surface active agent; and a water soluble weighting agent is a composite comprising low carbon alkali metal organic acid salt, organic acid ammonium and organic acid quaternary ammonium. When the drilling fluid is prepared, the corresponding compositions are sequentially added at a fixed stirring speed and a definite concentration according to the formula so as to obtain the drilling fluid. According to the invention, the problems of uncontrollable viscosity, high filtration loss volume, low solid phase volume and poor pollution resistance performance of the drilling fluid with high density are overcome.

The invention provides a polymer oil layer protective agent for a drilling fluid and a preparation method. The method is carried out according to the following steps of (1) adding 85-95 parts by volume of styrene, 5-65 parts by volume of butyl acrylate and 5-40 parts by volume of 2-acrylamido-2-methyl propanesulfonic acid to water, mixing uniformly, and then adding 5 parts by volume of an emulsifier to obtain a mixed liquid; (2) passing nitrogen into the mixed liquid obtained by the step (1) for 25-35 min, heating to a temperature of 70 DEG C, adding 0.01-0.2 part by weight of an initiator, and then reacting for 5-7 h by controlling the temperature at 70-80 DEG C to obtain a reaction liquid; (3) cooling the reaction liquid obtained by the step (2) to a room temperature, then adjusting a pH value of the liquid to 9-10 with a sodium hydroxide solution, putting the obtained solution in methanol with stirring, and precipitating to obtain a white precipitate; and (4) drying the white precipitate obtained by the step (3) at a temperature of 95-105 DEG C, and smashing the dried precipitate to obtain a product.

The invention relates to a formula and preparation method of a 180 DEG C temperature and salt resistant drilling fluid with strong inhibition and high density. The formula is characterized in that in the formula, a high temperature salt resistant shear strength improving agent is a silicate modified substance; fluid loss additives A and B are products with carbon-carbon chains as main chains and sulfonic acid groups, pyrrolidone groups or alkane groups as branched chains; an inhibiting / anti-collapse agent is a modified natural vegetable pitch derivative with a high softening point; an inhibiting / lubricating agent is a high polymer nonionic surfactant; and a water soluble heavy weight additive is a compound of low carbon organic acid salts of alkali metals, organic acid ammonium and organic acid quaternary ammonium. The preparation method is characterized by successively adding corresponding components with determined concentrations to the fresh water at a certain stirring speed according to the formula, thus obtaining the drilling fluid. The formula and the preparation method have the following beneficial effect: the problems of difficulty in control of viscosity, high fluid loss, low solid phase capacity and poor pollution resistance of the drilling fluid with high density are solved.

The invention discloses an application of aromatic amine hydrochloride serving as a shale inhibitor for a drilling fluid. The aromatic amine hydrochloride, specifically dopamine hydrochloride, can be used for effectively inhibiting clay hydration and swelling as well as inhibiting dispersion and flaking of the shale, and also can be used for effectively plugging the pores and micro cracks on the near surface of the shale.

The invention relates to a dendritic quaternary ammonium salt shale inhibitor as well as a preparation method and application thereof. The dendritic quaternary ammonium salt shale inhibitor is a modified product obtained by quaterisation reaction of terminal amino dendritic polymer, cyclic ether and tertiary amine. The preparation method comprises the following steps: dissolving the terminal amine dendritic polymer into a dissolving solvent, then slowly dropwise adding the tertiary amine, stirring for 0.5 to 3 hours at a room temperature, and then slowly dropwise adding the cyclic ether; raising the temperature to be 40 to 90 degree centigrade after dropwise adding is finished, and reacting for 2 to 12 hours; removing the dissolving solvent through evaporation, adding a deposition solvent to deposit out a solid body, and vacuum-drying the solid body, thereby obtaining the dendritic quaternary ammonium salt shale inhibitor. The dendritic quaternary ammonium salt shale inhibitor provided by the invention has excellent inhibition performance, can effectively inhibit hydration dispersion of active clay shale (high montmorillonite content), and can effectively perform an inhibition effect under a low concentration.

The invention relates to foam liquid for drilling, in particular to strong inhibition type anti-collapse foam liquid for drilling, which is characterized by being prepared with the following components in parts by weight: 0.09-0.11 part of foam stabilizer, 0.36-0.44 part of foaming agent, 2.34-2.86 parts of anti-collapse agent, 2.7-3.3 parts of fluid loss additive and 94.51-93.29 parts of water. When complex situations such as formation water occur to gas drilling, the foam liquid of the invention can effectively improve the rock carrying capacity and the water carrying capacity and simultaneously protect the stability of the upper well wall. Laboratory studies shown that the foam liquid has high foaming capacity, the foaming capacity is more than or equal to 500 percent, the half-life ismoderate, and the foam liquid can be easily controlled and is conducive to drilling engineering construction.

The invention relates to a formula and preparation method of a 200 DEG C temperature and salt resistant drilling fluid with strong inhibition and high density. The formula is characterized in that in the formula, a high temperature salt resistant shear strength improving agent is a silicate modified substance; fluid loss additives A and B are products with carbon-carbon chains main chains and sulfonic acid groups, pyrrolidone groups or alkane groups as branched chains; an inhibiting / anti-collapse agent is a modified natural vegetable pitch derivative with a high softening point; an inhibiting / lubricating agent is a high polymer nonionic surfactant; and a water soluble heavy weight additive is a compound of low carbon organic acid salts of alkali metals, organic acid ammonium and organic acid quaternary ammonium. The preparation method is characterized by successively adding corresponding components with determined concentrations to the fresh water at a certain stirring speed according to the formula, thus obtaining the drilling fluid. The formula and the preparation method have the following beneficial effect: the problems of difficulty in control of viscosity, high fluid loss, low solid phase capacity and poor pollution resistance of the drilling fluid with high density are solved.

The invention relates to a fracturing fracture-forming technique and a fracturing fracture-forming method for shale. The fracturing fracture-forming method comprises the following steps: I, arranging a shale well and a pump set on the ground, wherein the shale well comprises a shaft, a shaft wall, a shaft bottom and a horizontal shaft section; an overlying rock layer and a target layer are arranged on the outer side of the shaft wall; a conveying pipeline is arranged in the shale well; a packer is connected to the other end of the conveying pipeline; a perforation channel is formed in the outer wall of the horizontal shaft section; II, arranging a microwave generation device on the ground, arranging a microwave transmission line in the shale well, arranging a pipeline column on the outer side of the transmission line, and enabling a microwave receiving device to be connected to one end of the microwave transmission line; III, arranging the pump set on the ground, arranging the conveying pipeline in the shale wheel, and arranging a ball actuated sliding sleeve structure on the conveying pipeline. By adopting the fracturing fracture-forming technique and the fracturing fracture-forming method for shale, the problem that the cost of fracturing fluid is high in the fracturing process can be solved, and meanwhile, by using a method of microwave heating in combination with liquid nitrogen cooling, the problem that a seepage channel is blocked by water-locking as liquid phase near a well pore is relatively slow in volatilization speed due to the fact that the pressure difference is too small is solved.

The invention relates to an anti-swelling stabilizer for fracturing. The anti-swelling stabilizer is prepared from an organic cationic polymer, inorganic salt, a solubilizer and water. The anti-swelling stabilizer can be directly added to a fracturing fluid for use during oil well and gas well fracturing operation. When the addition mass percentage of the anti-swelling stabilizer in the fracturing fluid is 0.5-1%, an anti-swelling rate of the anti-swelling stabilizer can reach above 90%. The anti-swelling stabilizer has high-efficiency anti-swelling performance and high-temperature resistance, is low in working concentration and low in cost, and has good compatibility with the fracturing fluid.

The invention provides a mud-resistant agent composition for a cement-based binding material. The mud-resistant agent is a powdered solid composition, the total mass part number of the raw materials is 100, and the solid solute part comprises the following raw materials in parts by weight: 45-65 parts of a salt intercalator, 10-25 parts of a cationic clay coagulant agent, 10-15 parts of an anionic clay coagulant agent and 10-20 parts of a clay mineral end-face adsorbent. The clay mineral end-face adsorbent is preferably composed of any one or several of sodium silicate with a modulus of 3.0-3.6 and poly-ferric-silicate. According to the formula in the invention, the clay minerals can be easily subjected to hydration swelling due to surface hydration force, osmotic hydration force and capillary action, the cationic clay coagulant agent and the anionic clay coagulant agent can promote clay dispersion phase particles to be easily agglomerated and precipitated, and formation of a layered clay mineral structure capable of adsorbing the moisture and polycarboxylate superplasticizer molecules is eliminated, so that an intercalating space cannot be provided for PCE, and the consumption of clay expansion on water is reduced.

The invention discloses alkenyl-branched monomers and a preparation method thereof, and belongs to the field of organic synthetic chemistry. The monomers are prepared by the steps of reacting a hydroxyethyl-containing branched polyamide intermediate and acryloyl chloride at a room temperature in presence of an organic solvent and an acid-trapping agent; standing; separating an organic phase; washing for a plurality of times by neutralizing with a saturated sodium bicarbonate solution; drying by using anhydrous sodium sulfate; steaming the organic solvent out to obtain a crude product; and further purifying the crude product to obtain a polymer grade product. The monomers can be used as co-polymerization monomers to prepare hyperbranched polymers used for oilfields and to prepare branched water-soluble polymers for other applications and emulsifiers for emulsion polymerization.

The invention relates to an asphalt type plugging anti-sloughing agent for water-based drilling fluid, and in particular relates to quickly dispersed asphalt powder. The quickly dispersed asphalt powder consists of an asphalt component, oil soluble resin, a modifying agent and a separant. The invention further provides a preparation method of the quickly dispersed asphalt powder. The sample obtained according to the invention has high asphalt component content and good water dispersion stability, improves the quality of mud cakes, effectively restrains hydrous swelling of shale, prevents sloughing of a well wall, and has the characteristics of adjustable softening point and applicable temperature. Moreover, the quickly dispersed asphalt powder for the drilling fluid has simple production technique, high production efficiency, low requirement on equipment and environment condition, high operability, stable product performance, and no generation of waste materials and dust.

The invention belongs to the technical field of inclined well construction, and discloses drilling fluid, and a local crushing formation inclined well inverse well guide hole drilling process adopting same. The drilling fluid comprises bentonite, a coating agent, inorganic salt, a viscosity / filtration loss reducer, a wall protective agent and water, and the components are in synergistic cooperation, so dispersion of clay and rock debris is effectively inhibited, the well wall stabilizing ability is improved and the downhole safety of well drilling is effectively guaranteed. According to the local crushing formation inclined well inverse well guide hole drilling process, the aims of carrying the rock debris and returning slag, balancing the pressure of the bottom layer, stabilizing the well wall and the like are fulfilled by injecting the drilling fluid provided by the invention; and the inverse well guide hole drilling process can perform construction in the fractured formation, so the construction efficiency is increased by above 25 percent and the application range of the reverse well method is widened.

The present invention relates to a multifunctional soil and water conserving agent and its preparation. A superhigh molecular weight absorptive resin prepared through crosslinking and grafting is altered in its chemical bond strength and polymer network structure strength to maintain proper hydrophilic group and crosslinking degree, and proper amount of cationic groups are introduced to the molecular chain to form the novel multifunctional soil and water conserving agent capable of inhibiting the hydration, dispersion and migration of soil. The multifunctional soil and water conserving agent has several functions of absorbing water, maintaining water, conserving soil, keeping fertilizer, etc.

The invention belongs to the technical field of oil-gas field development and particularly relates to an oil well anti-swelling fracturing fluid and a preparation method thereof. The oil well anti-swelling fracturing fluid comprises base fluid and crosslinked fluid, wherein the base fluid is composed of water, a vegetable gum thickening agent, an anti-swelling additive, a bactericide, a conditioning agent and a discharge aiding agent; the crosslinked fluid is composed of water and a crosslinking agent; by using special properties such as charge density, surface adsorption and the like of the efficient anti-swelling fracturing fluid, the water base fracturing fluid is prepared. The cation of an anti-swelling agent acts on the surface of a clay crystal layer to form a good adsorption layer, so that clay minerals can be well separated from external fluid effectively, therefore, the hydrating swelling and transport of the clay minerals are restrained, the hole throat of an oil layer is protected, water-sensitive damage of an external working solution to the oil layer is reduced, and the anti-swelling fracturing fluid has important significance on improving oil layer and increasing and stabilizing yield in the later period.

The invention provides a clay inhibitor which is prepared by uniformly mixing an organic cationic compound A and a polyol amine compound B in a mass ratio of (1-5):1 at normal temperature. The invention also provides a preparation method of the clay inhibitor and an application of the clay inhibitor in inhibiting clay side effects. The clay inhibitor is simple in preparation process, is convenient to use and is low in cost; and the organic cationic compound and the polyol amine compound contained in the clay inhibitor achieve a synergistic effect, so that the negative impact of clay on the performance of a polycarboxylic acid water reducer is effectively reduced.

The invention provides a strong-plugging hydrophobic high-performance water-based drilling fluid. The strong-plugging hydrophobic high-performance water-based drilling fluid comprises bentonite slurry, sodium hydroxide, a polymer coating inhibitor, a filtrate reducer, an anti-collapse agent, a lubricant, a plugging agent, an activity regulator and a tackifying and shear strength improving agent. According to the strong-plugging hydrophobic high-performance water-based drilling fluid of the invention, the polymer coating inhibitor, the filtrate reducer, the anti-sloughing agent, the lubricant,the blocking agent and the tackifying and shear strength improving agent are used as core treating agents, so that the well wall stability, the inhibition capability, the lithology carrying capabilityand the lubricating anti-sticking performance of the obtained water-based drilling fluid completely meet the requirements of a tight gas exploratory well and a development well in a Linxing-Shenfu block; the plugging of micro-nano hole seams is realized; the large-amplitude hydration expansion of shale is avoided; a good lubricating effect is achieved; the underground pressure supporting condition is effectively reduced; the purposes of improving the mechanical drilling speed, reducing the underground accident rate and saving the cost are achieved; the environment-friendly requirement can bemet; the product is a non-toxic pollution-free product; the cost of the product is low; and the economic requirement is met.

The invention discloses a shale inhibitor, which is prepared by mass percentage of raw materials: 15-35% polydimethyldiallylammonium chloride, 10-25% polyetheramine, 10-25% % oxalic acid, 15-35% choline chloride and 15-40% water. The polyamine shale inhibitor obtained by the reaction of polyetheramine, oxalic acid, polydimethyldiallylammonium chloride and choline chloride can effectively inhibit the hydration expansion of mud shale, and has low toxicity and low Ammonia odor, high thermal stability and good compatibility with other treatment agents are currently the most promising amine shale inhibitors. The experimental results show that the rolling recovery rate is above 87.6%, the volume expansion rate is lower than 11.0%, and the water loss is lower than 29.6mL.

The invention relates to a strong-inhibition and strong-cementation well wall stabilizer and a preparation method thereof. The strong-inhibition and strong-cementation well wall stabilizer is characterized by containing a branched polyethyleneimine structure as a main chain and a catechol group grafted to the main chain. The strong-inhibition and strong-cementation well wall stabilizer has the beneficial effects that the strong-inhibition and strong-cementation well wall stabilizer has better well wall stabilization effect, is convenient in control on preparation process, simple to operate andstable in quality of a product and has better action effect when being used under the condition with the temperature being 150 DEG C, and a water-based drilling fluid system formed by taking strong-inhibition and strong-cementation well wall stabilizer as a key treating agent has relatively good rheological property, rejection capability and anti-sloughing property; and a drilling fluid treatingagent which can strongly inhibit hydration swelling of shales, can block consolidated rocks at the same time, improves the mechanical property of the shales and strengthens the pressure-bearing capacity of the well wall can effectively push a water-based drilling fluid to replace an oil-based drilling fluid, more efficiently keeps the well wall stablity and has an important theoretical and practical significance.