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Full-suspension cleaning polymer fracturing fluid and preparation method thereof

A polymer and fracturing fluid technology, which is applied in drilling compositions, chemical instruments and methods, earthwork drilling and production, etc., can solve the problems that the fracturing fluid is difficult to meet the requirements, and achieve good shear performance and reservoir damage Low, easy flowback effect

Inactive Publication Date: 2016-07-20
CHENGDU LEARN PRACTICES TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But on the other hand, with the deepening of oil and gas reservoir development, there are more and more high-temperature, medium-low permeability reservoirs, requiring fracturing fluids to resist high temperature, low residue, and low damage. The current common practice is to increase the amount of thickener and increase the The viscosity of the base fluid and the strength of the jelly have a high sand ratio to carry sand, and the fracturing fluid with a high amount of thickener is difficult to meet the requirements

Method used

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  • Full-suspension cleaning polymer fracturing fluid and preparation method thereof
  • Full-suspension cleaning polymer fracturing fluid and preparation method thereof
  • Full-suspension cleaning polymer fracturing fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] formula:

[0057] Deionized water: 40 parts;

[0058] 4 parts of zirconium trichloride;

[0059] 13 parts of ethylene glycol;

[0060] 6 parts of lactic acid;

[0061] Sodium chloride 0.1 part;

[0062] 0.01 parts of ammonium chloride.

[0063] The preparation steps are: heat 40 parts of deionized water to 50°C, add 4 parts of zirconium trichloride, 0.1 part of sodium chloride, and 0.01 part of ammonium chloride in sequence, stir at a speed of 20-40 rpm, and wait for the trichloride to After the zirconium is completely dissolved, add 13 parts of ethylene glycol and stir at a speed of 20-40 rpm. After fully dissolving, continue to add 6 parts of lactic acid, and then drop in 20% sodium hydroxide lye to adjust the pH value to 6. React at constant temperature for 480 minutes to obtain a colorless and transparent organic zirconium crosslinking agent.

[0064] Performance evaluation: the effect of using the above organic zirconium crosslinking agent in water-based frac...

Embodiment 2

[0066] formula:

[0067] Deionized water: 55 parts;

[0068] 18 parts of zirconium trichloride;

[0069] 22 parts of ethylene glycol;

[0070] 8 parts of lactic acid;

[0071] 0.3 parts of sodium chloride;

[0072] 0.02 parts of ammonium chloride.

[0073] The preparation steps are: heat 55 parts of deionized water to 70°C, add 18 parts of zirconium trichloride, 0.3 parts of sodium chloride, and 0.02 parts of ammonium chloride in sequence, stir at a speed of 20-40 rpm, wait for three After the zirconium chloride is completely dissolved, add 22 parts of ethylene glycol and stir at a speed of 20-40 rpm. After fully dissolving, continue to add 8 parts of lactic acid, and then drop in 20% concentration of potassium hydroxide lye to adjust the pH value To 7, constant temperature reaction for 480min, to obtain a colorless and transparent organic zirconium crosslinking agent.

[0074] Performance evaluation: with the same test conditions as in Example 1, the test results are basi...

Embodiment 3

[0076] formula:

[0077] Deionized water: 70 parts;

[0078] 25 parts of zirconium trichloride;

[0079] 28 parts of ethylene glycol;

[0080] 14 parts of lactic acid;

[0081] 0.5 parts of sodium chloride;

[0082] 0.03 parts of ammonium chloride.

[0083] The preparation steps are: heat 70 parts of deionized water to 80°C, add 25 parts of zirconium trichloride, 0.5 parts of sodium chloride, and 0.03 parts of ammonium chloride in sequence, stir at a speed of 20-40 rpm, and wait for the trichloride to After the zirconium is completely dissolved, add 28 parts of ethylene glycol and stir at a speed of 20-40 rpm. After fully dissolving, continue to add 14 parts of lactic acid, and then drop in 20% concentration of potassium hydroxide alkali solution to adjust the pH value to 8. React at a constant temperature for 480 minutes to obtain a colorless and transparent organic zirconium crosslinking agent.

[0084] Performance evaluation: with the same test conditions as in Exampl...

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Abstract

The invention discloses full-suspension cleaning polymer fracturing fluid and a preparation method thereof. The fracturing fluid is prepared from the following components in percentage by weight: polyacrylamide polymers, a cross-linking agent A, a cross-linking agent B, a proppant, an anti-swelling agent, a cleanup additive, a gel breaker and water, and the pH value is 5-7. The preparation method comprises the following steps: compounding a polymer solution of which the concentration is 0.2-0.5%, adding 0.1-0.4% of the cleanup additive, adding the cross-linking agent A and the cross-linking agent B, and performing uniform stirring. The fracturing fluid disclosed by the invention can be widely applied to sand fracturing of various oil and gas wells, and mainly aims to solve the problems that the sand settling speed of the conventional fracturing fluid system under a high temperature and dynamic shear state is high and the proppant is difficult to transport; compared with the conventional fracturing fluid system, the fracturing fluid system has the most significant characteristic that under the condition of simulated formation temperature and dynamic shear, the sedimentation speed of the proppant is basically zero, so that the dosage of the proppant and the dosage of liquid can be greatly reduced, the spreading profile of the proppant is improved, the effective fracture length is increased, and the oil and gas production is increased.

Description

technical field [0001] The invention relates to a polymer fracturing fluid and a preparation method thereof, belonging to the technical field of oil and gas reservoir fracturing transformation. Background technique [0002] Reservoir stimulation is one of the main measures to increase production of oil and gas wells. Fracturing fluid is the liquid used to improve the fluid conductivity in reservoir stimulation. Its main function is to break the formation and carry proppant into the designated position of the fracture, as a reservoir The sand-carrying ability of fracturing fluid plays a key role in fracturing stimulation. With the increasing difficulty of reservoir stimulation, new requirements are put forward for the sand-carrying performance of fracturing fluids. How to transport proppant to the far end of artificial fractures and realize the uniform laying of proppant in artificial fractures is a problem that needs to be solved at present. problem. But on the other hand,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/80
CPCC09K8/685C09K8/665C09K8/80C09K8/882C09K8/887C09K2208/12C09K2208/26
Inventor 任山唐朝钧张邵彬康毅
Owner CHENGDU LEARN PRACTICES TECH CO LTD
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