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High temperature resistant polymer thickener for oil field fracturing fluid and its preparation method and application

A high-temperature-resistant polymer and oilfield fracturing technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as unsuitable fracturing, and achieve strong sand-carrying ability, good elasticity, and high shear resistance sexual effect

Active Publication Date: 2018-03-13
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the environment of abnormal high temperature and high pressure in deep wells, the existing domestic fracturing fluid system is not suitable for fracturing such formations

Method used

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  • High temperature resistant polymer thickener for oil field fracturing fluid and its preparation method and application
  • High temperature resistant polymer thickener for oil field fracturing fluid and its preparation method and application
  • High temperature resistant polymer thickener for oil field fracturing fluid and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In this embodiment, AM (acrylamide), AMPS (2-acrylamido-2-methylpropanesulfonic acid), and NVP (N-vinylpyrrolidone) are used for polymerization.

[0032] The weight percent of each monomer component, initiator, chain transfer agent and water: AM: AMPS: NVP: potassium persulfate: sodium formate: H 2 O=15%: 10%: 5%: 0.09%: 0.06%: 69.85%.

[0033] Solution preparation: add 279.4g of deionized water to a 1000ml beaker, first add 7.72g of sodium hydroxide (solid) to it (sodium hydroxide is added mainly to make AMPS have better solubility), completely dissolve Afterwards, add AMPS 60g in the beaker again, slowly adjust pH with sodium hydroxide (40% liquid) to be about 4, then add AM40g in the beaker successively, NVP 20g, and stir to dissolve completely, then add the sodium formate of 0.24g wherein .

[0034] Solution adjustment: add neutralizing agent sodium hydroxide (40% liquid) to the solution, adjust the pH of the solution to 6.3, and raise the temperature of the solut...

Embodiment 2

[0038] In this embodiment, AM (acrylamide), MAA (methacrylic acid), and DMDAAC (methyl diallyl ammonium chloride) are used for polymerization.

[0039] The weight percent of each monomer component, initiator, chain transfer agent and water: AM: MAA: DMDAAC: ammonium persulfate: sodium bisulfite: sodium formate: H 2 O=17%: 8%: 5%: 0.02%: 0.06%: 0.06%: 69.88%.

[0040] Preparation of the solution: Add 279.52g of deionized water to a 1000ml beaker, first add 68g of AM to it, after it is completely dissolved, then add 32g of MAA to the beaker, after it is completely dissolved, add 20g of DMDAAC to it, And stir to dissolve completely, then add 0.24g of sodium formate to it.

[0041] Solution adjustment: add neutralizing agent sodium hydroxide (40% liquid) to the solution, adjust the pH of the solution to 6.8, and raise the temperature of the solution to 35° C.±2.

[0042] Polymerization of the solution: put the system in a water bath at 35°C, and blow nitrogen gas into the soluti...

Embodiment 3

[0045] In this embodiment, AM (acrylamide), AMPS (2-acrylamido-2-methylpropanesulfonic acid), DMC (methacryloyloxyethyltrimethylammonium chloride), DMAA (N, N- Dimethacrylamide) four monomers are polymerized.

[0046] The weight percent of each monomer component and water: AM: AMPS: DMC: DMAA: Ammonium persulfate: Sodium bisulfite: Sodium formate: H 2 O=15%: 5%: 5%: 5%: 0.03%: 0.03%: 0.1%: 69.84%.

[0047] Preparation of the solution: add 280g of deionized water to a 1000ml beaker, first add 3.86g of sodium hydroxide (solid) to it, after completely dissolving, then add 20g of AMPS to the beaker, and use sodium hydroxide (40% liquid) Slowly adjust the pH to about 4, then add AM 60g, DMC 20g, and DMAA 20g to the beaker in turn and stir to dissolve completely, then add 0.40g of sodium formate to it.

[0048] Solution adjustment: add neutralizing agent sodium hydroxide (40% liquid) to the solution, adjust the pH of the solution to 7, and cool the solution to 10° C.±1.

[0049] ...

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Abstract

The invention discloses a high-temperature-resistant polymer thickening agent for an oil field fracturing fluid as well as a preparation method and application of the thickening agent. The preparation method of the thickening agent comprises the following step: polymerizing acrylamide, other olefin monomers, an initiating agent and a chain transfer agent in an aqueous solution by virtue of a solution process, wherein the weight ratio of acrylamide to the other olefin monomers to water is (10-20):(6-18):(62-84); and the other olefin monomers are selected from one or more, preferably two or three, of anionic olefin monomers, cationic olefin monomers or non-ionic olefin monomers. According to the high-temperature-resistant polymer thickening agent disclosed by the invention, free radicals are generated by using an aqueous solution catalyst process so as to ensure that the monomers are subjected to ternary polymerization or quaternary polymerization to form the anionic high molecular polyacrylamide polymer with the molecular weight of 4,000,000-8,500,000. After the thickening agent is crosslinked with a crosslinking agent, the thickening agent can be used for tolerating high temperature of more than 210 DEG C, and has the advantages of good crosslinked gel elasticity, strong sand carrying capacity, anti-shearing performance, salt resistance, no residues and the like.

Description

technical field [0001] The invention relates to a high-temperature-resistant polymer thickener for oil field fracturing fluid and its preparation method and application. The polymer thickener has a temperature resistance of 210-230°C, and has cross-linkable sand-carrying properties, shear resistance and Advantages such as no residue. Background technique [0002] With the increasing depletion of global oil and the increasing difficulty of oil reservoir exploitation, fracturing as a technology for increasing oil production has been paid more and more attention. The purpose of fracturing is to maximize the conductivity of the reservoir to achieve the purpose of increasing oil and gas production. The fracturing fluid used in fracturing must have the characteristics of high viscosity, high shear resistance, excellent sand-carrying ability, and environmental protection without gel breaking and residue. As the main agent of water-based fracturing fluid, the thickener is mainly u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/62C08F220/56C08F220/58C08F226/10C08F220/06C08F226/02C08F220/34C08F2/38
CPCC08F2/38C08F220/56C09K8/62C08F220/585C08F226/10C08F220/34C08F220/54
Inventor 翟文何良好邱晓惠卢拥军方波管保山王海燕
Owner PETROCHINA CO LTD