The invention relates to a modified expansion-slowing particle profile controlling agent used for deep profile controlling and flooding of an oilfield and water plugging of an oil well, a preparation method thereof and application in the field of oil exploitation The modified expansion-slowing particle profile controlling agent comprises the following components in parts by weight: 4-20 parts of a water-soluble monomer, 10-50 parts of an oil-soluble monomer, 001-1 part of a water-soluble cross-linking agent, 002-2 parts of an oil-soluble cross-linking agent, 1-10 parts of a surfactant, 005-05 part of a water-soluble initiating agent, 0001-025 part of an oil-soluble initiating agent, 005-05 part of a coupling agent, 0-5 parts of alkaline and 30-70 parts of de-ionized water The modified expansion-slowing particle profile controlling agent overcomes the disadvantages of the conventional expansion type particles that water-absorbing expansion speed is high, the particles after expanding are too hard, and the particles cannot be used for deep profile controlling of the oilfield; the particle profile controlling agent is applied to water plugging of the oil well and deep fluid diversion of the oilfield with a high water content, improves displacement effects of water flooding, polymer flooding and surfactant flooding, and increases recovery efficiency of oil accumulation

Modified expansion-slowing particle profile controlling agent and preparation method as well as application thereof

The invention relates to a temperature and salt resistant hydrophobic association polymer oil displacement agent and its preparation method. The preparation scheme of the oil displacement agent is characterized in that the oil displacement agent comprises 57.0-59.8% (g/g) of acrylamide (AM), 39.3-40.0% (g/g) of sodium acrylate (NaAA), 0.1-0.2% (g/g) of N-allylphenylacetamide (NAPA), and 0.1-3.5% (g/g) of N,N-dimethyl-N-allylhexadecyl ammonium chloride (AHAC); and the preparation method comprises the following steps: adding the NAPA, the AHAC and an emulsifier into a reactor, adding water, and completely emulsifying; adding the NaAA and the AM, adjusting the pH value to 7, adding an initiator, reacting, washing, crushing, and drying to obtain a polymer product. The polymer has the characteristics of water solubility, high tackifying capability and high water and shear resistances. The viscosity reservation rate of the polymer solution having a concentration of 0.1wt% at 100DEG C reaches 91.3%, and the polymer can improve the simulation crude oil recovery efficiency by 16.6%.

Temperature and salt resistant hydrophobic association polymer oil displacement agent and its preparation method

Chemical secondary-crosslinking jelly foam water plugging and profile controlling liquid

Viscoelastic weak gel profile control agent

The invention discloses a shale inhibitor for well drilling and a preparation method thereof. A foaming agent comprises nonionic polyether, organic micromolecule quaternary ammonium salt, modified polyacrylamide and water, wherein the molecular weight of the nonionic polyether is 800-5000 and the nonionic polyether is one of polyoxyethylene ether, polyoxypropylene ether, polytetrahydrofuran, and polyoxyethylene propylene block ether or the mixture of the polyoxyethylene ether, polyoxypropylene ether, polytetrahydrofuran and polyoxyethylene propylene block ether; the organic micromolecule quaternary ammonium salt is trimethyl quaternary ammonium salt; and the modified polyacrylamide is cationic polyacrylamide and has a molecular weight of 100- ten million. The preparation method comprises the following steps of adding the nonionic polyether, organic micromolecule quaternary ammonium salt and water into a reaction kettle sequentially, heating up to 40-60 DEG C and stirring slowly; after dissolving, adding the polyacrylamide; and uniformly dissolving to obtain the product. The shale inhibitor for well drilling is applicable to a water-base drilling fluid, has good performance of inhibiting shale from expanding, and can effectively solve the problem of borehole instability caused by hydration of the shale in well drilling.

Shale inhibitor for well drilling and preparation method thereof

The present invention discloses a temperature resistant salt tolerant high efficiency gel and a preparation method and application thereof. The preparation method is characterized in that the preparation method comprises the following steps: preparing a comb-shaped associated copolymer PAH containing macromonomers and functional hydrophobic monomers into an aqueous solution having the concentration of 0.1 to 4g/L, the crosslinking agent concentration of 0.01 to 1.0g/L, the surfactant concentration of 0.01 to 8mmol/L and the sodium sulfite thermal stabilizer concentration of 0.005 to 1.0g/L; adding the aqueous solution into a mixing container with a stirring device; stirring the aqueous solution evenly at the room temperature; regulating the pH value of the solution to be equal to between 4 and 11, and obtaining a temperature resistant salt tolerant high efficiency gel polymer solution system used for tertiary oil recovery and scavenge, displacement modification, profile modification or water shutoff. The polymer solution system has micro-crosslinking to form the gel during the flowage inside the oil reservoir. The gel has good elasticity, not easy dehydration, stable gelling performance, and excellent tackification, temperature resistance, salt tolerance, shearing resistance and ageing resistance.

Temperature-resistant salt-resistant efficient gel, and preparation and use thereof

The invention discloses a method for preparing an allyl surface-active macromonomer, which is characterized by comprising the following steps: adding 20 portions of alkylphenol polyoxyethylene ether (CmH2m+1-C6H4-O-(CH2CH2O)nH, n is equal to 1 to 60, and m is equal to 1 to 20), 10 to 900 portions of solvent and 01 to 15 portions of catalyst into a three-mouth reaction flask with a reflux condensation device, and reacting the mixture for 1 hour under stirring at the room temperature; increasing temperature to 30 to 95 DEG C, adding 05 to 20 portions of allyl chloride into the reaction product, and continuously reacting for 6 to 48 hours; distilling the reaction product under reduced pressure to remove the solvent so as to obtain a crude product; and performing silica gel column chromatographic separation to obtain allyl alkylphenol polyoxyethylene ether with the yield of 70 to 95 percent The allyl alkylphenol polyoxyethylene ether has excellent surface activity, and can be directly used as a surfactant A water-soluble copolymer synthesized by taking the allyl alkylphenol polyoxyethylene ether as a surface-active macromonomer has the function of tackifying, or reducing solution surface tension and water-oil interfacial tension, and can be taken as a tackifying copolymer or a macromolecular surfactant for improving the oil recovery ratio

Shigao Wang

Papers

Temperature-resistant salt-resistant efficient gel, and preparation and use thereof

Method for preparing allyl surface-active macromonomer