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Treatment method of continental shale gas well fracturing operation waste liquid

A technology for shale gas wells and treatment methods, which is applied in mining wastewater treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc. problems, to achieve the effect of stable treatment effect, good environmental protection and production safety

Active Publication Date: 2013-04-17
RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complexity of the fracturing waste fluid system, it is very difficult to deal with recycling or reinjection standards, and the selectivity for reinjection wells is strong

Method used

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  • Treatment method of continental shale gas well fracturing operation waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Take a fracturing waste fluid produced during the development of shale gas vertical wells as an example.

[0018] The pH value of the waste liquid is 9.1, wherein the ferrous content is 21 mg / L, the suspended matter is 490 mg / L, the turbidity is 398 NTU, and the viscosity is 5.3 mPa·S.

[0019] The waste liquid is treated by using the waste liquid treatment method of continental shale gas well fracturing operation. The specific treatment steps are as follows:

[0020] Step 1, pH adjustment; add a pH regulator to the waste liquid, choose hydrochloric acid as the pH regulator, that is, add hydrochloric acid to the waste liquid to adjust the pH value of the waste liquid, so that the pH value of the waste liquid reaches 5.5.

[0021] Since the commonly used oxidants are generally acidic oxidants, adjusting the pH value of the waste liquid to weak acidity is beneficial to the implementation of subsequent steps.

[0022] Step 2, oxidative viscosity reduction; add an oxidant ...

Embodiment 2

[0034] Take a fracturing waste fluid produced during the development of shale gas horizontal wells as an example.

[0035] The pH value of the waste liquid is 6, the ferrous iron content is 36 mg / L, the suspended matter is 540 mg / L, the turbidity is 439 NTU, and the viscosity is 4.6 Pa·S.

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Abstract

The invention relates to the technical field of waste liquid treatment, relates to wastewater treatment of development of continental shale gas and especially relates to a treatment method of a continental shale gas well fracturing operation waste liquid. The treatment method of continental shale gas well fracturing operation waste liquid is characterized in that the treatment method is carried out by five steps of: adjusting pH, oxidizing and reducing viscosity, flocculating and settling, separating solid and liquid, absorbing and filtering. The method provided by the invention has the characteristics of simple process, low cost, continuous treatment, safe production, stable treatment effect and no limit of environment condition; the treated water can be recycled; the fracturing liquid or reinjection formation is configured, so that the water resource is saved; and the method provided by the invention is beneficial to environmental conservation.

Description

technical field [0001] The invention relates to the technical field of waste liquid treatment, and relates to waste water treatment of continental shale gas development, in particular to a treatment method for waste liquid from fracturing operations of continental shale gas wells. Background technique [0002] In the process of shale gas development, fracturing is one of the commonly used stimulation measures at present. This method occupies an irreplaceable position in gas testing of new wells, tapping the potential of gas wells in old areas, and stimulation of single wells. The fracturing fluid injected into the well during fracturing construction should have effective suspending and transporting proppants, less fluid loss, low friction, low residue content, easy flowback, good thermal stability and shear resistance, and good compatibility with formation rocks and It has the characteristics of good compatibility with underground liquids. In order to meet the above perform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/10
Inventor 何飞刘立张世君杨志刚李辉胡耀强司小明李建东黄鹤
Owner RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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