43results about How to "Easy to break glue" patented technology

The invention discloses fracturing fluid and a preparation method thereof. The fracturing fluid is formed by mixing base fluid and crosslinked fluid according to the crosslinking ratio of 100 to 5; the base fluid consists of the following compositions according to mass percentage: 03 to 0.5 percent of hydroxypropyl guanidine gum HPG-1, 0.4 to 0.5 percent of a temperature stabilizer for the fracturing fluid, 0.05 to 0.15 percent of a low temperature evocating agent for the fracturing fluid, 0.2 to 0.3 percent of a cleanup additive and the balance being sewage water from a crude oil layer; and the crosslinked fluid consists of the following compositions according to mass percentage: 0.5 to 1.5 percent of borax, 0.5 to 1.5 percent of ammonium persulfate and the balance being clear water. The method for preparing the fracturing fluid comprises the following steps: the prepared base fluid and the prepared fracturing fluid are respectively placed for 100 to 120 minutes and are mixed according to the crosslinking rate of 100 to 5 to form the fracturing fluid. The method adopts the sewage water for matching the fracturing fluid, saves cost, has small pollution to the environment and improves the wave and volume of a water-driven reservoir and the oil-sweeping efficiency.

The invention discloses fluid gel for generating seal valve plugging air layers by virtue of formation temperature. The fluid gel is composed of the following ingredients in parts by weight: 10-30 parts of gel crosslinking system and 1 part of gel initiator, wherein the gel crosslinking system is composed of water, an initiator monomer and a crosslinking monomer; and counted by the total mass percentage of the fluid gel, the initiator monomer accounts for 2-15%, the crosslinking monomer accounts for 0.1-5%, the gel initiator accounts for 0.1-2%, and the balance is water. The fluid gel disclosed by the invention is simple in formula, low in cost and high in pressure resistance.

The invention discloses a liquefied polymer fracturing liquid thickener, which has the following evaluation indexes: the density is 1.0-1.3g / cm<3>; the gelling time is less than or equal to 15s; and the viscosity of 1.0% the dissolved liquefied polymer fracturing liquid thickener is greater than or equal to 30mPa.s. The invention also discloses a method for preparing the liquefied polymer fracturing liquid thickener.

The invention relates to a method for preparing a high temperature retarding-type organic boron zirconium cross linking agent, which comprises the following steps of: adding organic zirconium salt into a three-neck flask filled with a mixed solvent of water and glycerol; stirring to ensure the organic zirconium salt to be totally dissolved; then adding a boron compound; performing a reaction for 30 to 60 minutes at a temperature of 60 DEG C; adding polyatomic alcohol, triethanolamine and EDTA-2Na (Ethylene Diamine Tetraacetic Acid-2Na); heating to a temperature of 80 DEG C and performing a reaction for 4 to 5 hours; and regulating the pH to the range of 7 to 9 by aqueous solution of NaOH with the concentration of 20 percent to obtain the boron zirconium cross linking agent. The cross linking agent prepared by the method disclosed by the invention has the characteristics of small using amount, controllable retarding cross-linking time, high temperature resistance, easiness for gel breaking, low damage and low fraction resistance.

The invention provides a quaternary ammonium salt type Gemini surface active agent and preparation, a product and application thereof. The surface active agent is shown as the formula (I), and please see the formula (I) in the description, wherein R1 is a saturated or unsaturated alkyl group with the main chain carbon atom number being 16-26, or a saturated or unsaturated alkyl group with the main chain carbon atom number being 16-26 and containing an amide group; R2 is methyl or ethyl or ethoxyl; R3 is selected from one of ethylidene; X is chlorine or bromine. According to the synthesized Gemini surface active agent, the highest temperature resisted by the surface active agent can reach 160 DEG C, and the temperature resistance is better than that of an existing conventional dimeric surface active agent.

The invention provides an adjustable viscoelastic supramolecular clean fracturing fluid system and a preparation method thereof. The clean fracturing fluid system is composed of the following components in mass percentage: 1.0-6.0% cationic surfactant; 0.2-6.0% organic acid 1.0%; Inorganic salt 0.1-2.0%; Amphiphilic polymer 0.1%-1.0%; Water 98.6-90.0%. When preparing, first prepare super long-chain fatty amide cationic surfactant, dissolve inorganic salt in water, and then Then add amphiphilic polymer, organic acid and cationic surfactant in sequence, and after fully stirring, a supramolecular cleaning fracturing fluid can be obtained; this supramolecular cleaning fracturing fluid has the property of adjustable viscosity, through Join to achieve different performance requirements. At the same time, it can effectively fracture the formation, with simple configuration, small dosing amount, strong sand-carrying property, and good temperature resistance, which avoids the problems of large dosing amount and poor temperature resistance in the existing conventional clean fracturing fluid system, and improves the pressure. Improve fracturing efficiency, reduce fracturing costs, and expand applicable formation conditions.

The invention belongs to the technical field of oilfield chemistry and fracturing stimulation, and provides an elastic sand-carrying fracturing fluid, a thickener used in the fracturing fluid and a preparation method thereof. The raw materials for the preparation of the thickener include the following parts by weight Number of components: 0.5-1.5 parts of acrylamide; 1-5 parts of octadecyltrimethylammonium bromide; 0.05-0.15 parts of potassium persulfate; 0.005-0.015 parts of alkali; diethylene glycol distearate 1-5 parts; 0.5-1.5 parts of tripolyglycerol diisostearate; 0.2-0.8 parts of sodium tetradecyl carboxylate; 0.2-1.5 parts of fatty acid amidopropyl dimethylamine; 0.2-0.8 parts of tertiary amino alcohol The elastic sand-carrying fracturing fluid is composed of the following components in weight percentage: thickener 0.20%-0.55%; crosslinking agent 0.20%-0.55%; drainage aid 0.1%-0.5%; anti-swelling agent 0.1% -0.5%; the balance is water; the preparation method includes the steps of preparing an acrylamide solution, an intermediate solution, a product, and a thickener. The elastic sand-carrying fracturing fluid of the present invention has simple liquid preparation, obvious construction effect and good rheological performance; after the thickener and cross-linking agent are used in combination, the viscosity is low and the sand-carrying ability is strong.

The invention provides a method for improving sand-carrying capacity of fracturing fluid and fiber-containing fracturing fluid. The method for improving the sand-carrying capacity of the fracturing fluid comprises the step of adding fibers into the fracturing fluid, wherein the addition amount of the fibers is 0.3-0.8 weight part based on 100 weight parts of the fracturing fluid; the fibers have the tensile strength of 20-300MPa, the true density of 0.98-1.33g / cm<3>, the length of 3-15mm and the diameter of 25-150 microns; and the fibers refer to soluble fibers. The fiber-containing fracturing fluid provided by the invention refers to fracturing fluid prepared by the method. According to the method for improving the sand-carrying capacity of the fracturing fluid, the sand-carrying capacity can be improved, the amount of a thickening agent is reduced, the viscosity of base solution is reduced, and the damage and cost of the fracturing fluid can be further reduced. Moreover, residues of the fracturing fluid can be reduced, and gel breaking is easily realized by virtue of the fracturing fluid.

The invention discloses fluid gel for generating seal valve plugging air layers by virtue of formation temperature. The fluid gel is composed of the following ingredients in parts by weight: 10-30 parts of gel crosslinking system and 1 part of gel initiator, wherein the gel crosslinking system is composed of water, an initiator monomer and a crosslinking monomer; and counted by the total mass percentage of the fluid gel, the initiator monomer accounts for 2-15%, the crosslinking monomer accounts for 0.1-5%, the gel initiator accounts for 0.1-2%, and the balance is water. The fluid gel disclosed by the invention is simple in formula, low in cost and high in pressure resistance.

The invention provides high-temperature-resistant recyclable clean fracturing fluid for gas wells. The high-temperature-resistant recyclable clean fracturing fluid comprises, by weight, 1%-4% of thickening agents, 0.5%-5% of potassium chloride and the balance water. The high-temperature-resistant recyclable clean fracturing fluid for the gas wells has the advantages that the fracturing construction cost can be reduced, the high-temperature-resistant recyclable clean fracturing fluid can be recycled and is free of residues, good in compatibility and low in friction resistance and harm, gel breaking can be easily implemented, and continuous mixed sand fracturing construction can be implemented by the aid of the high-temperature-resistant recyclable clean fracturing fluid for the gas wells; a certain quantity of defoaming agents can be added into flowback fluid after fracturing construction is completed, so that the high-temperature-resistant recyclable clean fracturing fluid can be used for preparing fracturing fluid, and environment-friendly production and sustainable development of the gas wells can be guaranteed.

The invention relates to the field of oil fields, in particular to a heating electrolysis sewage treatment pool and a sewage treatment method. It includes the pool body, and also includes an exhaust gas discharge structure leading to the interior of the pool body. The exhaust gas discharge structure is used to heat and / or chemically break the sewage in the pool body. Sewage gel breaking in the engine cooling pool body, the chemical gel breaking refers to the chemical components in the exhaust gas and the substances in the sewage combined to break the gel, and the sewage is electrolyzed at the same time. This scheme can not only realize the treatment of the tail gas, but also make full use of the heat in the tail gas to heat the sewage to break the glue. The chemical components can react with the components in the sewage to break the gel, which not only avoids the pollution of the exhaust gas to the atmosphere, but also makes it convenient to break the gel.

The invention discloses a high-salt-resistant viscoelastic surfactant cleaning fracturing fluid and a preparation method thereof. The fracturing fluid contains a cationic surfactant, and the structural formula of the cationic surfactant is: wherein, R 1 'Selected from saturated alkyl groups with 16≤n≤24 carbons, unsaturated alkyl groups with 16≤n≤24 carbons, R 1 Selected from saturated alkyl groups with 16≤n≤24 carbons and unsaturated alkyl groups with 16≤n≤24 carbons, R 2 It is selected from saturated alkyl groups with 3≤C≤7 carbons, unsaturated alkyl groups with 3≤C≤7 carbon atoms, and short-chain (C≤5) alkylbenzenes. The cationic surfactant has good resistance to inorganic salts, the principle is that R 2 The substituents prevent the polar head groups of cationic surfactants from approaching each other under the condition of high salinity, avoid the precipitation of cationic surfactants, make the micelles continue to maintain a dense three-dimensional network structure, and improve the viscosity-increasing performance.

A low-harm thickened acid, based on the total weight of the thickened acid solution, the mass fraction of each component is: acid thickener 2‑10%, acidification corrosion inhibitor 1‑4%, iron ion stabilizer 1-3%, acid 10-28%, and the balance is water; the present invention uses viscoelastic surfactant as a thickening agent in acidification, which can effectively delay the reaction rate of acid rock and produce acid erosion with good flow conductivity Worm holes to achieve deep acidification; compared with polymer thickened acid, surfactant thickened acid system has the advantages of easy to obtain raw materials, simple preparation, easy to break the gel, less damage to the formation, no cross-linking agent added, easy to return Advantages of the row.