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Fracturing flowback fluid treatment method

A technology of fracturing flowback fluid and treatment method, which is applied in the treatment of fracturing flowback fluid and the field of fracturing flowback fluid treatment, and can solve the problem of difficult water quality reaching the national first-level discharge standard, unsatisfactory treatment effect, and process steps cumbersome and other problems, to achieve the effect of ideal treatment effect, good pollutant removal effect and simple process flow

Inactive Publication Date: 2013-12-25
南阳油田腾龙实业有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Throughout the current treatment processes of various fracturing flowback fluids at home and abroad, all of them are characterized by high equipment investment, cumbersome process steps, long treatment cycle, and high operating costs, resulting in unsatisfactory treatment effects
It is difficult to make the treated water meet the national first-level discharge standards in a short period of time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] ①. Gel breaking and flocculation: first add SF--Ⅲ compound flocculation dosage of 1.0g / L to the fracturing flowback fluid as a pretreatment agent, then add a gel breaking agent of 1.5g / L, and then add a regulator The amount is 0.5ml / L, the residence and sedimentation time is 3 hours, and the supernatant is discharged into the catalytic oxidation facility for treatment. And timely detect the water quality indicators of the facility's inflow and outflow.

[0040] Among them, the water quality of facility influent (fracturing flowback fluid): CODcr 7553mg / L; PH value 9.1; appearance is light yellow viscous liquid; has pungent smell.

[0041]The effluent water quality after gel breaking and flocculation: CODcr 1259mg / L; removal rate up to 83.2%; PH value 8.5; colorless liquid.

[0042] ②. Catalytic oxidation: Add 0.5ml / L concentrated sulfuric acid with a concentration of 98% to the coagulation effluent, adjust the pH value to 3, enter the catalytic oxidation facility, and ...

Embodiment 2

[0048] ①. Gel breaking and flocculation: first add SF--Ⅲ compound flocculation dosage of 0.8g / L to the fracturing flowback fluid as a pretreatment agent, then add a gel breaking agent of 1.6g / L, and then add a regulator The amount of the solution is 0.4ml / L, the residence and sedimentation time is 3.5 hours, and the supernatant is discharged into the catalytic oxidation facility for treatment. And timely detect the water quality indicators of the facility's inflow and outflow.

[0049] Among them, the water quality of facility influent (fracturing flowback fluid): CODcr 6530mg / L; PH value 9.3; appearance is light yellow viscous liquid; has pungent smell.

[0050] The effluent water quality after gel breaking and flocculation: CODcr 1227.6mg / L; removal rate up to 81.2%; PH value 8.8; colorless liquid.

[0051] ②. Catalytic oxidation: add 0.7ml / L concentrated sulfuric acid with a concentration of 98% to the coagulation effluent, adjust the pH value to 3.3, enter the catalytic o...

Embodiment 3

[0057] ①. Gel breaking and flocculation: first add SF-Ⅲ composite flocculation dosage of 0.8g / L to the fracturing flowback fluid as a pretreatment agent, then add a gel breaking agent of 1.3g / L, and then add a regulator The amount of the solution is 0.7ml / L, the residence and sedimentation time is 2.5 hours, and the supernatant is discharged into the catalytic oxidation facility for treatment. And timely detect the water quality indicators of the facility's inflow and outflow.

[0058] Among them, the water quality of the facility influent (fracturing flowback fluid): CODcr 6409mg / L; PH value 9.5; the appearance is a light yellow viscous liquid; it has a pungent smell.

[0059] The water quality of the effluent after gel breaking and flocculation: CODcr 1190mg / L; the removal rate is 81.4%; the pH value is 8.0; it is a colorless liquid.

[0060] ②. Catalytic oxidation: Add 0.6ml / L concentrated sulfuric acid with a concentration of 98% to the coagulation effluent, adjust the pH...

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Abstract

The invention relates to a treatment method for fracturing flowback fluid in fracturing exploitation of unconventional oil and gas fields of petroleum, natural gas, shale gas, coal seam gas and the like, which is also suitable for treatment of fracturing flowback fluid in conventional oil and gas fields. The method comprises the following steps: in a fracturing flowback fluid process, pretreating a gel breaking and flocculating step of the fracturing flowback fluid by adding a certain amount of composite flocculants and performing coagulation reaction by adding a certain amount of gel breakers and regulators; and treating by catalytic oxidation and electric flocculation oxidation processes, so that the fluid can be discharged outside or reclaimed water can be reused, wherein the indexes of effluent reach the national first grade emission standard. The method for treating the fracturing flowback fluid of the conventional oil and gas fields has the characteristics of extremely good pollutant removing effect, small equipment investment, short treatment period, low operation cost, simple process flow, stability and reliability, ideal treatment effect, convenience for operation and the like, thereby having a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment produced in the exploitation of unconventional oil and gas fields, and specifically relates to a treatment method for fracturing flowback liquid, which is suitable for the fracturing and exploitation of unconventional oil and gas fields such as petroleum, natural gas, shale gas, and coalbed methane. Treatment of fracturing flowback fluid. Background technique [0002] At present, oil and gas field fracturing operation is one of the main measures of oil and gas well stimulation measures commonly used in various oil and gas fields. In particular, the fracturing of unconventional wells requires special techniques and large-scale fracturing techniques. During the fracturing process, a relatively large amount of fracturing flowback fluid will be produced, usually hundreds, thousands or tens of thousands of cubic meters, and its composition is very high. complex. Contains guar gum, formaldehy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F1/52
Inventor 孙向党李静仁陈贡生马世胜王照华忽国全
Owner 南阳油田腾龙实业有限公司
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