58 results about "Gel time" patented technology

The invention discloses temperature-resisting salt-tolerant high-temperature self-cross-linking onsite polymerization water plugging gel which mainly consists of, by mass, main agent 4%-6%, cross-linking agent 1%-2% and the balance saline water. The main agent consists of a monomer A and a monomer B, wherein the monomer A is acrylamide, and the monomer B is ester matter. The cross-linking agent is one of or a mixture of two or more formaldehyde, phenolic resin, resorcinol, hexamethylene tetramine, paraformaldehyde and polyethyleneimine. The temperature-resisting salt-tolerant high-temperature self-cross-linking onsite polymerization water plugging gel spontaneously produces cross-linking polymerization under the condition of high temperature, an initiator is not added, the gelling time can be controlled to be 2 hours to 28 hours at the temperature of 120 DEG C, the water plugging gel can be directly prepared by high-salinity water, the gelling strength can be up to the visual inspection code level I, and synaeresis does not occur after 90 days. The temperature-resisting salt-tolerant high-temperature self-cross-linking onsite polymerization water plugging gel is low in initial viscosity, has the advantages of being few in components, good in instant solubility and pumping injection performance, high plugging strength, good in thermohaline stability, low in cost and the like and has wide application prospect on the aspect of high-temperature high-salinity oil reservoir profile control water plugging.

A water based solution having a controllable gel time is disclosed. The solution has predetermined ratios of a water soluble silicate solution having at least one alkali metal, a predetermined ratio of a water dispersible polymer, and a predetermined ratio of a water soluble initiator containing a reactive carbonyl compound.

A sealant composition for servicing a wellbore, comprising a crosslinkable material, a crosslinking agent, a fluid loss control additive, water, and a cement present in an amount in a range of from about 0% to about 50% by weight of the sealant composition. A method of preparing a sealant composition, comprising combining a crosslinkable material, a crosslinking agent, a fluid loss control additive, water, and a cement, and controlling the amount of cement in the sealant composition such that the sealant composition has a gel time greater than or equal to about 4 hours when exposed to ambient temperatures in a wellbore.

The invention discloses a temperature-resistant salt-resistant profile control plugging agent and a preparation method thereof. The temperature-resistant salt-resistant profile control plugging agent is prepared from the following raw materials in parts by weight: 1-3 parts of temperature-resistant salt-resistant polyacrylamide, 0.15-1.2 parts of crosslinking agent A, 0.03-0.1 part of crosslinking agent B, 0.01-0.1 part of setting retarder, 1-7.5 parts of pH regulator and 988-997 parts of water. The preparation method comprises the following steps: adding the pH regulator into the water, sufficiently dissolving, adding the temperature-resistant salt-resistant polyacrylamide, stirring for 2-4 hours, adding the setting retarder and crosslinking agent B, stirring at normal temperature for 1-2 hours, adding the crosslinking agent A, stirring uniformly, and standing at the constant temperature of 70-90 DEG C for 3-5 days. The profile control plugging agent has the characteristics of temperature resistance, salt resistance, high gel strength, adjustable gelling time and the like, has selectivity for oily water plugging, and can enter the deep part of the oil reservoir after being injected to plug the high-transmissibility paths, thereby improving the waterflooding development effect and enhancing the recovery ratio of the oil reservoir.

The invention discloses a super-slow resin anchoring agent. Unsaturated polyester resin is adopted; one or a plurality of tertiary amine accelerant, quinhydrone, naphthaquinone or other polymerization inhibiting stabilizer with similar functions, and other chemical assistant and filler are added in resin production or later process to be mixed into resin cement; initiator (solidifying agent) is one or a plurality of dibenzoyl peroxide or other similar peroxide, pasty or powdered solidifying agent diluted by water, stone powder or other inert materials; and the mixture is packaged into scrolls by a diplopore film bag or packaged by a barrel or other packaging modes. In the formulation, the super-slow resin anchoring agent produced through fine adjustment, which has gelling time of between 10 and 180 minutes and compressive strength not less than 40MPa, so the super-slow resin anchoring agent can meet special requirements of long engineering construction, high strength requirement, and the like.

The invention relates to a method for preparing a polysaccharide biogum polymer gel profile control agent. The method includes the steps that polysaccharide biogum is dissolved in distilled water for allocating a solution, a monomer and a cross-linking agent are added into the solution, nitrogen is led in, the air is isolated, then an initiating agent is added, and the profile control agent is obtained through thermostatic reaction. The method for preparing the polysaccharide biogum polymer gel profile control agent has the advantages that the cost of raw materials is low, and the raw materials are wide and capable of being obtained easily; various properties such as gelling time, gelling strength, the mobility after gelling, temperature resistance and salt resistance of the profile control system can be controlled by changing the concentration of the polysaccharide biogum, the monomer, the cross-linking agent and the initiating agent in the reaction system or by changing the type and the initiating system of the cross-linking agent; certain mobility is achieved, the profile control agent can be injected under the shaft easily, and a high permeability layer in the stratum can be effectively plugged; the strength is good, and the method is suitable for oil deposit with the formation temperature being below 150 DEG C; the method is suitable for high-salt oil deposit.

The invention discloses a phenolic aldehyde weak gel control and flooding agent for rapid gelling of low temperature oil reservoirs. The control and flooding agent consists of the following components in percentage by mass: 0.05-0.5% of a main component, 0.04-1% of a coagulation accelerator, 0.05-0.5% of a cross-linking agent, 0.01-0.05% of polyphenol and the balance of clear water or salt water. The main component is polyacrylamide HPAM or an acrylamide copolymer; and the acrylamide copolymer is comb salt-resistant polymer KYPAM, acrylic-2-acrylamide-2-methyl propane sulfonic acid copolymer AM / AMPS or acrylic-acrylamide-2-acrylamide-2-methyl propane sulfonic acid copolymer AM / AA / AMPS. According to the control and flooding agent disclosed by the invention, gelling time at normal temperature can be controlled within 5-24h, final gelling strength is high and heat salt stability is good; and the weak gel system is convenient in field preparation, strong in operability and is widely applicable to the control and flooding operation of various low temperature oil reservoirs.

The invention belongs to the field of oilfield chemistry related to the enhanced oil recovery technique, and particularly relates to intercalation delay in-situ polymerization water shutoff gel for a high-temperature oil reservoir. The intercalation delay in-situ polymerization water shutoff gel is prepared from, by mass, 6-8% of host agent, 1-2% of cross-linking agent, 2-8% of intercalation host agent, 0.06-0.1% of initiator, 0.01-2% of gelling regulating agent, and the balance water. The intercalation delay in-situ polymerization water shutoff gel has the advantages that the fast dissolving property of components in the gel system is good, and liquid dosing is convenient; the construction technology is simple, pumpability is high, and injectivity is high; gelling time can be controlled to be 4-30 h at 130 DEG C; long-term stability is high at high temperatures, and synaeresis and strength reduction does not occur on the gel within three months; influence on gelling performance is small, leak-off prevention can be well achieved, and the gel can be used for water shutoff of fractured reservoirs.

The invention discloses a high-temperature resistant secondary cross-linked gel profile control agent and a preparation method thereof, and belongs to the technical field of oilfield chemistry. The profile control agent has good gelling property and high plugging strength and can resist high temperature of 150 DEG C, and the gelling strength and the gelling time can be adjusted. The high-temperature resistant secondary cross-linked gel profile control agent is mainly characterized by the secondary composite crosslinking process, that is, a plugging agent reacts with a first crosslinking agent under the ground condition to form flowable gel similar to weak gel so as to reduce filter loss of the plugging agent in oil deposit during the construction process and reduce the risk of blocking a low-permeability oil flow channel by the plugging agent; and a second crosslinking agent has a second crosslinking reaction under the high-temperature condition of an oil layer to form high-strength gel so as to effectively plug a high-permeability steam flowing channel, and accordingly, steam suction is controlled, and the sweep efficiency is improved. Gelling of the high-temperature resistant secondary cross-linked gel profile control agent is characterized in that micromolecules are inserted into organic macromolecular materials HPAM, and micromolecules and macromolecules mutually permeate, so that a gel system easily performs sizing; and meanwhile, temperature resistance, salt resistance, shear resistance and ageing resistance are enhanced, and the system performance can be well played.

The invention relates to a downhole drilling crosslinked gel leak stopping agent and a leak stopping method thereof. Taking weight percent of the leak stopping agent as 100%, the leak stopping agent comprises 10-30% of a macromolecular polymer, 10-30% of a crosslinking agent, 0-20% of a coagulant or retarder, 10-30% of polymer fibers, 2-10% of a toughening agent and 10-30% of a dispersing agent. In the leak stopping agent, the coagulant is used for shortening crosslinking time, the retarder is used for prolonging the crosslinking time, and the coagulant or retarder also can not be added into a formula. The leak stopping agent has good leak stopping effect and also has retention and pressure-bearing capabilities; meanwhile, the pressure-bearing capability is strong, and gelling time is basically not influenced by salt invasion, drilling cuttings and the like.

The invention discloses a tulobuterol-containing aquogel patch, which comprises tulobuterol, a macromolecular framework material, a crosslinker, a crosslinking regulator, a humectant and distilled water, wherein the crosslinker is a combination of more than two organic acids; and at least one organic acid is tartaric acid and at least the other organic acid is selected from citric acid, gluconic acid, lactic acid, malic acid and malicaicd. The invention also discloses a method for preparing the tulobuterol-containing aquogel patch. The tulobuterol-containing aquogel patch and the preparation method of the invention make the cohesion of aquogel matrix so stable that the matrix avoids cloth penetration, hardening and other phenomena; the patch is proper in viscosity and insusceptible to falling off after being adhered and can be stripped without causing pains; and the method is controllable in gel time and can meet requirements for industrial large-scale production.

A water based solution having a controllable gel time is disclosed. The solution has predetermined ratios of a water soluble silicate solution having at least one alkali metal, a predetermined ratio of a water dispersible polymer, and a predetermined ratio of a water soluble initiator containing a reactive carbonyl compound.

Methods for reducing the amount of water produced from a subterranean formation can include the use of a gellable treatment fluid that comprises a gel-time modifier comprising at least one amino group. The gellable treatment fluids can comprise an aqueous base fluid, a base polymer comprising an acrylamide monomer unit, an organic crosslinking agent, and a get-time modifier comprising at least one amino group.

The present invention relates to plasticizer preparations based on triacetin with short gel time, and to their use, and to polyvinyl chloride preparations.

This invention relates to a production method for flax etc un-woven fabrics and its composite materials including stewing flax, releasing, carding, spreading nets and needling characterizing that the selected flax fiber is 2.8-18.5cm long, mean fineness is 12-40mum, 2-5% weight of the flax fiber and water are uniformly added to be stewed for 24hours, the needling frequency is 600-650r / min, thickness of the no-woven fabric is 2-7mm, weight is 380-860g / sqm, characterizing that needled fabric is taken as the intensifying body of the compound material matched with resin to be prepared by vacuum absorption method, the weight ratio of the resin is: unsaturated polyester resin: initiator: improver=100:0.8-1.2:1.2-1.5, the initiator is Copper I IIperoxide, the improver is Co naphthenate, vacuum pressure of the vacuum absorption method: -0.085-0.095MPa for 10-30min gelling time: 15-30min.

The invention discloses an environment-friendly crosslinking and gelling retarding profile control agent and a preparation method thereof and belongs to the field of enhanced oil recovery technologies for oilfields. The profile control agent comprises a primary agent, i.e. hydrophobic association, a crosslinking agent, i.e. aluminum citrate, an antioxidant, i.e. sodium sulfite, and a retarding agent, i.e. sodium malate, and contains all the ingredients in percentage by weight: 0.1-0.4% of hydrophobic association, 0.01-0.02% of aluminum citrate, 0.015-0.025% of sodium sulfite, 0.005-0.020% of sodium malate and the balance of water. The profile control agent disclosed by the invention has the characteristics that the profile control agent is environment-friendly and is free of damage / injury to environments / human bodies; the crosslinking is retarded, and the gelling time is prolonged, thereby being beneficial to high-dose injection and deep profile control; the plugging rate is high; and the profile control agent has certain temperature-resistant and salt-tolerant performance and scouring resistance. The profile control agent can be used for adjusting a water absorption profile of a water-flood well and improving the water-flood development effect of oilfields.

The invention relates to a method and a device for measuring the gelling time of gel. Based on the phenomenon that in the gelling process of the gel, a gel system can form a spatial meshed structure, and the physical and chemical properties of the gel system can change to cause the changes of resistivity of the system, the changes of the conductivity of gel solution in a reaction kettle under the conditions of high temperature and high pressure are measured by utilizing an avometer and an electrode so as to conveniently and accurately measure the gelling time of various types of gel systems, and the measuring results have good repeatability.

A method of using a water based solution having a controllable gel time. The method includes providing a predetermined ratio of a water soluble silicate solution having at least one alkali metal, providing a predetermined ratio of a water dispersible polymer, and providing a predetermined ratio of a water soluble initiator containing a reactive carbonyl compound. One embodiment of the method also includes combining the water soluble silicate solution, the dispersible polymer, and the water soluble initiator and injecting downhole in a single stage treatment. Another embodiment of the method includes pre-mixing at least the water soluble silicate solution and the dispersible polymer into a mixture, then injecting the water soluble initiator and the mixture downhole separately for a multi-stage treatment with in situ mixing.

The invention relates to a delayed crosslinked chromium gel profile control plugging agent, belonging to the technical field of oilfield profile control plugging. The delayed crosslinked chromium gel profile control plugging agent is formed by crosslinking partially hydrolyzed polyacrylamide and Cr<3+> generated by redox reaction. The delayed crosslinked chromium gel profile control plugging agent is composed of the following components in percentage by weight: 0.3-0.8% of partially hydrolyzed polyacrylamide, 0.02-0.20% of sodium dichromate, 0.15-0.50% of additive and the balance of water. Compared with the reported chromium gel, the delayed crosslinked chromium gel has the advantages of long gelling time, high heat stability and high gel strength. Under the optimal formula, the delayed crosslinked chromium gel has high plugging rate, favorable abrasion resistance and high practicality, and satisfies the demands for on-site construction.

The invention provides a high-temperature profile control temporary plugging agent as well as a preparation method and application thereof. In percentage by weight, the high-temperature profile control temporary plugging agent is prepared from the following raw materials: 1-4% of a melamine type substance, 0.5-5% of aldehyde and / or hexamethylenetetramine, 0.5-2% of acrylamide, 0.05-0.2% of a plasticizer, 0.05-0.2% of persulfate, and the balance of water. The high-temperature profile control temporary plugging agent has the characteristics of good pumping property, temperature resistance, long-term effectiveness, simple preparation, low cost and the like; moreover, the high-temperature profile control temporary plugging agent is adjustable in gelling time and strong in plugging capacity, can adapt to a wide range of oil reservoir types, cannot pollute a stratum layer easily, and can enter deep parts of the stratum layer, thereby effectively solving production problems of uneven steam drive oil reservoir steam absorption profile, inter-well steam channeling and the like.

The invention belongs to karst stratum reinforcement and water blocking technique in tunnel and underground construction. The quick gelling, micro expansion and high strength type injecting grout material is prepared from P.O42.5 cement, and calcium lignosulphonate, soda and calcium sulphoaluminate expanding agent (specially for grout injection) of which the weight percentages account for the weight of the cement are 0.4 percent, 0.4 percent and 8 percent respectively, and the water cement ratio of the grout is as follows: W / C is equal to 1.2 to 1. The injecting grout material prepared by the invention has characteristics of quick gelling, micro expansion and high strength, a plurality of experiments and site tests in tunnel underground construction show that the injecting grout material has relatively ideal gelling time and water blocking reinforcement and seepage preventing effects.

The invention provides a temperature-sensitive gel diverting agent and a preparation method and application of the temperature-sensitive gel diverting agent. The temperature-sensitive gel diverting agent is mainly prepared from the following components in parts by weight: 1-3 parts of acrylamide, 1-3 parts of an inorganic material, 0.5-1.5 parts of potential alkali, 0.05-0.15 part of a cross-linking agent, 0.1-0.2 part of an initiator and the balance of water, wherein the components are 100 parts in total weight. The novel temperature-sensitive gel diverting agent synthesized by the invention also has certain erosion resistance besides the characteristics of certain jelly strength and adjustable gelling time (5-20 hours), and is capable of prolonging the validity period of profile control of a water injection well by the gel, the subsequently injected water is compelled to turn to an oil reservoir with relatively low permeability, and the water injection wave and efficiency and the oil recovery factor can be improved.

The invention discloses a composite hydrogel loaded with an exosome and a preparation method thereof, which belong to the technical field of biomedical engineering. The preparation method comprises the following steps: firstly separating and purifying the exosome from the C57 mouse mesenchymal stem cells, then uniformly dispersing the exosome in an oxidized hyaluronic acid solution, and performinga cross-linked reaction by an aldehyde group of the oxidized hyaluronic acid and a hydrazide group of oxalyl dihydrazide to obtain the composite hydrogel. The preparation method is simple, rapid, andhighly reproducible. The prepared exosomes-loaded composite hydrogel has the advantages of high local concentration and low systemic toxicity, and has tumor permeability and long residence time. In addition, the composite hydrogel has injectability, biodegradability and drug release properties, and the gel time is fast and can be regulated.

A one component moisture-curing polyurethane adhesive composition having a long pot life that does not cause its user to experience breathing difficulty is described. In one embodiment the adhesive is prepared from a mixture of a high molecular weight component selected from the group consisting of polyols, diamines, and mixtures thereof; an isocyanate; and a low molecular weight component selected from the group consisting of diols, diamines, and mixtures thereof.

The present disclosure relates to a curing agent for a curable resin which is a reaction product obtained from the reaction of a liquid epoxy and a polyamine component. The curing agent may be used as part of a two component curable system for the curing of unmodified epoxy resins.

The invention relates to the technical field of water injection well oil extraction and especially relates to a rigid gel plugging agent for plugging a fluid channeling big channel of a medium-temperature oil reservoir. The rigid gel plugging agent comprises, by mass, 3.0% to 5.0% of acrylamide, 3.0% to 5.0% of a molecular chain-grafted enhancer, 0.03% to 0.15% of N, N-methylene bisacrylamide, 0.005% to 0.015% of azobis(isobutyramidine) hydrochloride and the balance of water. The rigid gel plugging agent has good shear and salt resistance, high strength, good thermal stability, good solubility and cold water solubility, and can form a uniform solution which is not easy to settle and has good injection performances. The solution of the rigid gel plugging agent before gelling has a certain viscosity. Through combined action of a gelling control agent and a reservoir temperature, the rigid gel plugging agent forms gel underground and gelling time can be controlled.

The invention relates to a method for preparing a cross-linking acrylamide profile control agent. The method comprises the steps of completely dissolving a cross-linking agent through acid, adding an initiator, leading in N2, adding a mixed solution of acrylamide and sulfonyl-containing monomers, performing free radical polymerization reaction in the closed atmosphere of N2 to form a product, causing the product to undergo the nucleophilic addition reaction, and obtaining polymer gel. The method has the advantages that raw materials are extensive, easy to obtain and low in cost; the cross-linking acrylamide profile control agent has good environmental friendliness compared with frequently-used chromic salt and phenolic aldehyde and the like; the viscosity of a system, gelling time and the performances of gel after gelling are controlled through the changing of the concentration or reaction temperature of the monomers, the cross-linking agent and the initiator; when the environment temperature range is 100-140 DEG C, no obvious degradation occurs, and the viscosity retention rate is high; and when the coarse salt concentration range is 0-2.5*105 mg / L, the cross-linking acrylamide profile control agent can have good stability and is not subjected to gel breaking and precipitation.

The invention discloses stable marble glue. A composition of attapulgite, montmorillonoid and sepiolite is adopted as an anti-sinking agent, a piperidine nitroxide free radical polymerization inhibitor and phenol and quinine polymerization inhibitors are reasonably compounded as a polymerization inhibitor, styrene, divinyl benzene, alpha-methyl styrene and isobornyl acrylate are compounded as an active diluent, and the stability of marble blue is improved from three aspects of sedimentation prevention, polymerization inhibition and 'icicle' prevention. Compared with marble glue of the prior art, the stable marble blue disclosed by the invention has an equivalent gel time, mechanical properties, such as the tension shearing strength, the compression shearing strength, the impact toughness and the bending elastic modulus are all greatly improved, and in addition, the time that a polymer is formed at a marble glue tank opening, the preservation life of the glue at 80 DEG C and the time ofcolloid standing and phase splitting at 30 DEG C are greatly delayed when being compared with those in the prior art.