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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 reuse: it is difficult for the flowback fluid after pure flocculation and sedimentation treatment to reach the pressure of reconstitution The cracking fluid meets the construction requirements

Method used

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

Examples

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Effect test

Embodiment 1

[0020] A method for treating oil and gas well fracturing flowback fluid. The fracturing flowback fluid discharged through the wellhead of the oil well is put into a buffer tank for oxidation treatment, and a regulator is added to the oxidized fracturing flowback fluid. Adjust the pH of the fracturing flowback fluid after oxidation treatment to 7.5-9, send the adjusted fracturing flowback fluid into the reactor through the lift pump, and add treatment chemicals to the fracturing flowback fluid in the reactor, Make it fully mixed and react to form flocs. When the flocs no longer increase, the reacted mixture is pumped into the solid-liquid separation device (centrifugal separator) for solid-liquid separation. 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 fluid; the refined treatment includes three methods:

[00...

Embodiment 2

[0026] On the basis of Example 1, the regulator is sodium hydroxide; the treatment agent includes the following ingredients: oxidant, flocculant, coagulant, bactericide; The dosing amount is: oxidant 1-2kg / square, flocculant 2-10kg / square, coagulant aid 1-3kg / square, fungicide 0.05-0.1kg / square, using the agents in this example to achieve rapid flocculation and sedimentation , more than 95% of the flocculation and sedimentation process can be completed in 10 minutes. 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. Filter the residue, filter out the incompatible solid phase, that is, perform solid-liquid separation, conduct ion detection on the liquid phase, and perform refined treatment according to the results, mainly to remove various ions and suspended solids, chroma, and COD in the water. After refined treatment, the ion content of the liquid is detect...

Embodiment 3

[0028] On the basis of implementation 2, the treatment agents are hydrogen peroxide, polyaluminum chloride, polyacrylamide, and dodecyldimethylbenzyl ammonium chloride, which are added according to the following dosage per cubic meter of fracturing flowback fluid, Hydrogen peroxide 1kg / square, polyaluminum chloride 2kg / square, polyacrylamide 1kg / square, dodecyl dimethyl benzyl ammonium chloride 0.05kg / square, the chromaticity (dilution factor) is 30 after the reaction is completed, The suspended matter SS is 50, the chemical oxygen demand is 80mg / L, and the petroleum 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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