Treatment agent and treatment method of fracturing flow-back fluid

A technology for fracturing flowback fluid and treatment methods, which is applied in the fields of mining wastewater treatment, oxidized water/sewage treatment, sterilization/microdynamic water/sewage treatment, etc., and can solve high cost, waste of resources, and performance impact of fracturing fluid and other problems, to achieve the effect of simple method, realization of reuse and low cost

Inactive Publication Date: 2020-03-31
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a treatment agent and a treatment method for fracturing flowback fluid, so as to solve the problem of long treatment process flow, high cost, waste of resources, and the occurrence of residual chemicals in the recovery and reuse of fracturing fluid in the prior art. Issues that affect the performance of the subsequent prepared fracturing fluid

Method used

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  • Treatment agent and treatment method of fracturing flow-back fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Take a certain amount of flowback fluid of hydroxypropyl guaridine fracturing fluid from Xinjiang Oilfield, adjust the pH value of the fracturing flowback fluid to 6.5 with a pH regulator, and add a treatment agent accounting for 0.15% of the weight of the fracturing flowback fluid. The treating agent includes sodium chlorite and citric acid, wherein the added amount of sodium chlorite is 0.1%, and the added amount of citric acid is 0.05% (the weight ratio of the two is 10:5). After stirring and filtering, the changes of various indicators of the fracturing flowback fluid before and after the measurement and treatment are shown in Table 1.

Embodiment 2

[0037]The difference from Example 1 is that for the treating agent accounting for 0.0145% of the fracturing flowback fluid, the added amount of sodium chlorite is 0.01%, and the added amount of citric acid is 0.0025% (the weight ratio of the two is 10:2.5) .

Embodiment 3

[0039] The difference from Example 1 is that a treatment agent accounting for 0.112% of the fracturing flowback fluid is added, wherein the added amount of sodium chlorite accounts for 0.1%, and the added amount of citric acid accounts for 0.01% (the weight ratio of the two is 10:1 ), and add partially hydrolyzed polyacrylamide accounting for 0.002% of the fracturing flowback fluid.

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Abstract

The invention provides a treatment agent and a treatment method of a fracturing flow-back fluid. The treatment agent comprises chlorite and organic acid. By adopting the treatment agent provided by the invention, the purposes of rapidly killing bacteria and simultaneously removing sulfide, ferrous ions, iron ions, calcium ions, magnesium ions and suspended solids can be achieved. Meanwhile, the invention further provides a method for treating the fracturing flow-back fluid through the treatment agent. The method is simple in process and low in cost and realizes resource recycling; and the treatment agent does not have adverse effects on the performance of the subsequently-prepared fracturing fluid even if residues exist.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a treatment agent and a treatment method for fracturing flowback fluid. Background technique [0002] After the fracturing operation of the oil and gas well, the fracturing fluid breaks under the action of the formation conditions and the gel breaker, reduces the viscosity, and flows back from the formation to the surface. The fracturing fluid discharged back contains a large amount of additives, formation ions, and mechanical impurities. Direct discharge will seriously pollute the environment, and the cost of harmless treatment is relatively high. Therefore, in recent years, domestic and foreign research on fracturing fluid recovery and reuse technology has been carried out, that is, the fracturing fluid recovered and discharged is recycled and then used again for fracturing construction. The method can not only save water and materials for liquid preparation, but also solve th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/50C02F1/76C02F103/10
CPCC02F1/50C02F1/76C02F2103/10
Inventor 张敬春潘竟军怡宝安邬国栋翟怀建
Owner PETROCHINA CO LTD
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