Oil and gas well fracturing flow-back fluid treatment method

A technology for fracturing flowback fluid and treatment methods, which is applied in earthwork drilling, wellbore/well components, production fluids, etc., and can solve problems such as limited single treatment volume, poor water quality, and difficulty in reuse

Active Publication Date: 2015-11-18
SHAANXI HAIMO OILFIELD SERVICE +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There must be enough fracturing fluid tanks to store the flowback fluid, otherwise the single treatment volume will be limited; the water quality after treatment is poor and it is difficult to

Method used

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  • Oil and gas well fracturing flow-back fluid treatment method
  • Oil and gas well fracturing flow-back fluid treatment method

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0019] Example 1

[0020] A method for treating oil and gas well fracturing flowback fluid. The fracturing flowback fluid discharged from the wellhead of the oil well enters a buffer tank for oxidation treatment, and a regulator is added to the fracturing flowback fluid that has undergone oxidation treatment. The pH of the fracturing flowback fluid after the oxidation treatment is adjusted to 7.5-9, and the adjusted fracturing flowback fluid is sent to the reactor by the lift pump, and the treatment agent is added to the fracturing flowback fluid in the reactor. Make it fully mixed and react and generate flocs. When the flocs do not increase, pump the reacted mixture into a solid-liquid separation device (centrifugal separator) for solid-liquid separation, and the separated solid phase is directly The solid-liquid separation device is discharged, and the separated liquid phase is refined for recycling or directly discharged to complete the treatment of fracturing flowback liquid;...

Example Embodiment

[0025] Example 2

[0026] On the basis of Example 1, the regulator is sodium hydroxide; the treatment agent includes the following ingredients: oxidant, flocculant, coagulant, and bactericide; the treatment of each side of fracturing flowback fluid The dosage of oxidizer is 1~2kg / square, flocculant is 2~10kg / square, coagulant aid is 1~3kg / square, bactericide is 0.05~0.1kg / square, and the agent in this embodiment is used to achieve rapid flocculation and sedimentation. , 10 minutes can complete more than 95% of the flocculation sedimentation process. After 10 minutes of flocculation and settling time, the treatment result can reach more than 80% of the 6-hour treatment effect of traditional chemical treatment agents. The residue is filtered, the solid phase is filtered out, that is, solid-liquid separation is carried out, the liquid phase is subjected to ion detection, and the refined treatment is carried out according to the results, mainly to remove various ions and suspended s...

Example Embodiment

[0027] Example 3

[0028] On the basis of implementation 2, the treatment agents are hydrogen peroxide, polyaluminum chloride, polyacrylamide, dodecyl dimethyl benzyl ammonium chloride, and the following dosages are added to the cubic fracturing flowback fluid. Hydrogen peroxide 1kg / square, polyaluminum chloride 2kg / square, polyacrylamide 1kg / square, dodecyldimethylbenzylammonium chloride 0.05kg / square, the color (dilution multiple) is 30 after the reaction is completed, The suspended solids SS is 50, the chemical oxygen demand is 80mg / L, and the petroleum product is 5.

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Abstract

The invention relates to an oil and gas well fracturing flow-back fluid treatment method. The method comprises the steps that fracturing flow-back fluid flowing back from an oil well mouth enters a buffer tank to be oxidized, a conditioning agent is added into the oxidized fracturing flow-back fluid, the PH of the oxidized fracturing flow-back fluid is adjusted to range from 7.5 to 9, the adjusted fracturing flow-back fluid is fed into a reactor through a lift pump, a treatment agent is added into the fracturing flow-back fluid in the reactor, sufficient mixing and reaction are achieved to generate floccule, the reacted mixture is pumped into a solid-liquid separation device for solid-liquid separation, solid phases obtained after separation are directly discharged out of the solid-liquid separation device, liquid phases obtained after separation enter a fine treatment device, and suspended matter, chromaticity and large-particle ions are removed further. Up-to-standard release and recycle of discharged water are achieved, the fracturing flow-back fluid is treated, flocculating settling, solid-liquid separation and filtering and clarification are efficiently and continuously achieved for oil and gas well fracturing flow-back fluid in an oil field, and the purposes of recycling, up-to-standard release and reinjection into a reservoir are achieved.

Description

technical field [0001] The invention belongs to the technical field of oil and gas well environmental protection engineering. Specifically, the invention discloses a method for treating oil and gas well fracturing flowback fluid. Background technique [0002] During the development of oilfields, especially low-permeability reservoirs, a large amount of waste liquid will flow back to the ground during the fracturing of gas wells and oil wells. Pollutants such as additives in crude oil and fracturing fluid, the main components of which are solid suspended matter (including formation particles, fracturing sand, gel-breaking residue and water-insoluble matter), crude oil, dissolved organic matter, bacteria, inorganic salts, etc., are It is a stable and complex multi-phase dispersion system, and it is very difficult to meet the standard treatment. In recent years, with the development of volumetric fracturing in horizontal wells in oil fields, the contradiction between the large...

Claims

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Application Information

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IPC IPC(8): E21B43/26
Inventor 杨立君梁庆狄国银李志鹏余海李世英
Owner SHAANXI HAIMO OILFIELD SERVICE
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