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Preparation of high-salt-resistant self-elasticity-increasing type hydrophobic association polymer and application of high-salt-resistant self-elasticity-increasing type hydrophobic association polymer in fracturing fluid

A hydrophobic association and polymer technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of low viscosity retention rate and large viscosity reduction, and achieve convenient operation, increased elasticity and high solution cost Effect

Pending Publication Date: 2022-01-14
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the above-mentioned prior art, the present invention provides a high-salt-resistant self-elasticity hydrophobic association polymer, which can be used in fracturing fluids to solve the problems of traditional fracturing fluids under high salinity conditions. Viscosity decreases greatly, viscosity retention rate is low, etc.

Method used

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  • Preparation of high-salt-resistant self-elasticity-increasing type hydrophobic association polymer and application of high-salt-resistant self-elasticity-increasing type hydrophobic association polymer in fracturing fluid
  • Preparation of high-salt-resistant self-elasticity-increasing type hydrophobic association polymer and application of high-salt-resistant self-elasticity-increasing type hydrophobic association polymer in fracturing fluid
  • Preparation of high-salt-resistant self-elasticity-increasing type hydrophobic association polymer and application of high-salt-resistant self-elasticity-increasing type hydrophobic association polymer in fracturing fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Synthesis of Hydrophobic Monomers Containing Polyethers

[0044] (1) Dissolve oleic acid in dichloromethane, slowly add thionyl chloride solution dropwise at a molar ratio of 1:1.15, reflux reaction under ice bath conditions for 8 hours, pass the generated tail gas into NaOH solution for processing, and react After cooling, the organic solvent dichloromethane was removed by rotary evaporation with a rotary evaporator, and a light yellow solid was obtained by suction filtration, and vacuum-dried to constant weight to finally obtain the intermediate oleic acid chloride;

[0045](2) The intermediate oleic acid chloride obtained in the first step reaction and allyl polyethylene glycol-1000 (APEG-1000) are reacted at a molar ratio of 1:1.1 to 1.2 to obtain a polyether monomer; first, the APEG -1000 was added to a three-neck round bottom flask, and anhydrous ethanol solution was added to dissolve it. After it was completely dissolved, it was transferred to an ice bath, and a ...

Embodiment 2

[0047] Synthesis of Hydrophobic Monomers Containing Polyethers

[0048] (1) Dissolve erucic acid in dichloromethane, slowly add thionyl chloride solution dropwise at a molar ratio of 1:1.15, reflux reaction for 8 hours under ice-bath conditions, pass the generated tail gas into NaOH solution for processing, and react After cooling, use a rotary evaporator to remove the organic solvent dichloromethane, filter with suction to obtain a light yellow solid, dry it in vacuum to constant weight, and finally obtain the intermediate erucic acid chloride;

[0049] (2) The intermediate erucic acid chloride obtained in the first step reaction and allyl polyethylene glycol-1000 (APEG-1000) are reacted at a molar ratio of 1:1.1 to 1.2 to obtain a polyether monomer; first, the APEG -1000 into a three-neck round bottom flask, add absolute ethanol solution to dissolve, after complete dissolution, transfer to ice bath condition, slowly add the mixed solution of absolute ethanol containing inter...

Embodiment 3

[0051] (1) Add 30g of acrylamide, 4g of acrylic acid, 6g of 2-acrylamido-2-methylpropanesulfonic acid, 2g of N,N-dimethylallyl octadecyl ammonium and 0.5g of polyacrylic acid into a 200ml beaker The ether monomer APOA was made into an aqueous solution with a monomer concentration of 30%, and sodium dodecyl sulfate (SDS) accounting for 1% of the total monomer concentration was added at the same time, and stirred until a clear solution was obtained.

[0052] (2) After the solution is fully mixed, pass nitrogen gas for 30 minutes to remove dissolved oxygen in the water.

[0053] (3) With 2,2-azobisisobutylamidine dihydrochloride (V50) as the initiator, the initiator accounts for 0.2% of the total monomer concentration, and the free radical Aqueous solution polymerization, react for 6 hours to get the required hydrophobic association polymer, finally cut the obtained hydrophobic association polymer into pieces, soak and dry with absolute ethanol, grind into powder, and obtain high...

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Abstract

The invention belongs to the technical field of oil gas yield increase, and discloses preparation of a high-salt-resistant self-elasticity-increasing type hydrophobic association polymer and application of the high-salt-resistant self-elasticity-increasing type hydrophobic association polymer in fracturing fluid. The preparation method of the polymer comprises the following steps: (1) synthesizing a hydrophobic monomer with polyether: reacting oleic acid with thionyl chloride to obtain a live intermediate oleic acid acyl chloride, and reacting the intermediate oleic acid acyl chloride with allyl polyethylene glycol to obtain a polyether monomer; and (2) synthesizing the hydrophobic associated polymer, namely polymerizing acrylamide, acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid, a cationic hydrophobic monomer and a polyether hydrophobic monomer APOA according to the mass ratio of (50-60): (20-30): (10-15): (3-5): (0.5-1.5) at the temperature of 1-20 DEG C for 4-8 hours, and drying and pulverizing to obtain polymer powder. The elasticity of the polymer is increased along with the increase of the mineralization degree, the polymer still has excellent elasticity and very high viscosity retention rate under the mineralization degree of 300,000, and when the polymer is applied to the fracturing fluid, the problems of low salt resistance, low sand suspending capacity and the like of the traditional fracturing fluid can be effectively solved.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development, and in particular relates to the preparation of a high-salt-resistant self-elasticity hydrophobic association polymer and its application in fracturing fluid. Background technique [0002] With the continuous development of the oil and gas field development industry, the development of complex reservoirs puts forward new requirements for fracturing fluids. High temperature resistance, high salinity, shear resistance, and low damage to reservoirs have become the new development direction of fracturing fluids. At present, fracturing fluids are generally divided into water-based fracturing fluids, oil-based fracturing fluids, emulsion fracturing fluids, foam fracturing fluids and VES fracturing fluids. A comprehensive comparison shows that oil-based fracturing fluid has poor rheological properties and high cost, foam fracturing fluid construction is inconvenient, emulsified fra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/56C08F220/06C08F220/58C08F226/02C09K8/68
CPCC08F283/065C09K8/685C09K8/887C09K8/882C09K8/607C09K8/608C09K2208/26C09K2208/12C08F220/56C08F220/06C08F220/585C08F226/02
Inventor 毛金成曹会敏杨小江张恒薛金星
Owner SOUTHWEST PETROLEUM UNIV
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