Method for treating and recycling shale gas fracturing flow-back fluid

A technology of fracturing flowback fluid and flowback fluid, which is applied in degassed water/sewage treatment, mining wastewater treatment, water/sewage treatment, etc. It can solve the problems of low water quality standards, low secondary reuse rate, and foaming rate. Advanced problems, to achieve good anti-compound salt characteristics, good fluid loss control performance, and low cost effects

Active Publication Date: 2020-07-17
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for the treatment and reuse of shale gas fracturing flowback fluid in view of the defects and deficiencies in the above-mentioned prior art. This method can solve the problems in the existing fracturing flowback fluid recycling treatment method. Existing technical problems of low water quality standard after treatment, high foaming rate, and low secondary reuse rate

Method used

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  • Method for treating and recycling shale gas fracturing flow-back fluid
  • Method for treating and recycling shale gas fracturing flow-back fluid

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Embodiment 1

[0035] A method for treating and recycling shale gas fracturing flowback fluid, comprising a step of treating shale gas fracturing flowback fluid and a step of preparing polymer glue,

[0036] Among them: the steps for processing the shale gas fracturing flowback fluid are:

[0037] a. Add an acid-base regulator to the fracturing flowback fluid to adjust the pH value to 7;

[0038] b. Add defoamer to the fracturing flowback fluid and then stir. If there are bubbles, continue to add defoamer. If there are no bubbles, add fungicide;

[0039] c. After adding the fungicide, take a sample for detection, if the bacterial content of sulfate-reducing bacteria SRB≤25 / mL, iron bacteria FB≤10 4Individual / mL, saprophytic bacteria TGB≤10 4 per mL, add metal ion complexing agent, if the bacteria content exceeds the standard, continue to add fungicide;

[0040] d. Stir after adding the metal ion complexing agent, stop stirring after the reaction is complete, take the supernatant for testi...

Embodiment 2

[0044] A method for treating and recycling shale gas fracturing flowback fluid, comprising a step of treating shale gas fracturing flowback fluid and a step of preparing polymer glue,

[0045] Among them: the steps for processing the shale gas fracturing flowback fluid are:

[0046] a. Add an acid-base regulator to the fracturing flowback fluid to adjust the pH value to 8;

[0047] b. Add defoamer to the fracturing flowback fluid and then stir. If there are bubbles, continue to add defoamer. If there are no bubbles, add fungicide;

[0048] c. After adding the fungicide, take a sample for detection, if the bacterial content of sulfate-reducing bacteria SRB≤25 / mL, iron bacteria FB≤10 4 Individual / mL, saprophytic bacteria TGB≤10 4 per mL, add metal ion complexing agent, if the bacteria content exceeds the standard, continue to add fungicide;

[0049] d. Stir after adding the metal ion complexing agent, stop stirring after the reaction is complete, take the supernatant for test...

Embodiment 3

[0053] A method for treating and recycling shale gas fracturing flowback fluid, comprising a step of treating shale gas fracturing flowback fluid and a step of preparing polymer glue,

[0054] Among them: the steps for processing the shale gas fracturing flowback fluid are:

[0055] a. Add an acid-base regulator to the fracturing flowback fluid to adjust the pH value to 8;

[0056] b. Add defoamer to the fracturing flowback fluid and then stir. If there are bubbles, continue to add defoamer. If there are no bubbles, add fungicide;

[0057] c. After adding the fungicide, take a sample for detection, if the bacterial content of sulfate-reducing bacteria SRB≤25 / mL, iron bacteria FB≤10 4 Individual / mL, saprophytic bacteria TGB≤10 4 per mL, add metal ion complexing agent, if the bacteria content exceeds the standard, continue to add fungicide;

[0058] d. Stir after adding the metal ion complexing agent, stop stirring after the reaction is complete, take the supernatant for test...

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Abstract

The invention discloses a method for treating and recycling shale gas fracturing flow-back fluid. The method comprises a step of treating the shale gas fracturing flow-back fluid and a step of preparing a polymer glue solution, wherein the polymer glue solution is prepared by the following steps: adding 0.5%-1.0% by mass of polyacrylamide potassium salt KPAM and 2.0%-3.0% by mass of a polymer filtrate reducer LS-2 into clear water, and hydrating to expand a polymer molecular chain, so as to obtain the polymer glue solution; mixing the polymer glue solution and the treated fracturing flow-backfluid according to the ratio of 7: 3, and the mixed fracturing flow-back fluid is used for preparing drilling fluid. According to the invention, mechanical equipment does not need to be added, operation is directly conducted in the on-site circulating tank, the method is simple, and extra cost is not increased; no secondary pollution waste is generated, and the treated fracturing flow-back fluid is completely recycled, so that the invention is more environment-friendly.

Description

technical field [0001] The invention relates to the technical field of oil and gas drilling, in particular to a method for treating and recycling shale gas fracturing flowback fluid. Background technique [0002] Long-section horizontal wells, staged perforation and slick water volume fracturing technologies are often used in shale gas exploitation. The fracturing fluid consumes a lot of water in hydraulic fracturing. In addition, the fracturing fluid also contains a variety of chemical additives, including anti-scaling Agents, drag reducers, fungicides, surfactants, etc. After the fracturing operation, the flowback fluid accounting for 60% to 80% of the injected fracturing fluid is gradually flowed back to the surface. The fracturing flowback fluid has the characteristics of high chemical oxygen demand, high suspended solids, high salinity, difficult biodegradation and complex composition, so there are great safety and environmental protection risks. First, the fracturing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C09K8/03C02F103/10
CPCC02F9/00C09K8/03C02F1/66C02F1/20C02F1/50C02F1/54C02F1/542C02F1/68C02F2103/10
Inventor 范劲李茂森彭碧强刘政李俊材胡静肖蓝宣贾兴明唐润平
Owner BC P INC CHINA NAT PETROLEUM CORP
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