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Reutilization method and treatment device for flow-back fracturing fluid

A technology of fracturing flowback fluid and treatment equipment, which is applied in chemical instruments and methods, degassed water/sewage treatment, water/sewage multi-stage treatment, etc., can solve problems such as inoperability and complicated treatment process, and achieve economical installation Compared with the cost of disassembly, the process flow is short, and the effect of avoiding pipeline layout

Active Publication Date: 2015-06-10
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process is greatly affected by the ambient temperature, and it cannot operate when it is lower than 20°C
At the same time, the liquid treated by this process needs to enter the downstream sewage treatment system to be mixed and diluted with other sewage for further treatment, and the treatment process is complicated.

Method used

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  • Reutilization method and treatment device for flow-back fracturing fluid
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  • Reutilization method and treatment device for flow-back fracturing fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment one: if figure 1 , figure 2 As shown, a fracturing flowback fluid reuse method and treatment device.

[0040] Flowback well 1; gas-liquid separation device 2; settling tank 3; lift pump A4; oil storage tank 5; lift pump B6; fracturing flowback fluid treatment device 7; lift pump C8; fracturing fluid distribution tank 9; Flocculation tank 10; agitator 11; online pH meter 12; online TSS (total suspended solids) meter 13; ultraviolet sterilizer 14; chemical tank A15; chemical tank B16; chemical tank C17; metering pump A18; metering pump B19; Pump C20; slag outlet A21; centrifugal device 22; lift pump D23; slag outlet B24; motor 25; control system 26.

[0041] Terminal A is for adding demulsifier, terminal B is for gas combustion device combustion, terminal C is for adding bactericide, terminal D is for adding lost additives, terminal E is for repeated use of fracturing construction, terminal F is for residual concentration analysis of additives, terminal G F...

Embodiment 2

[0068] (1) The fracturing flowback fluid is discharged from the flowback well 1, and is separated from the gas and liquid by the gas-liquid separation device 2, the gas is burned in the gas combustion device, and the liquid enters the settling tank 3;

[0069] (2) There is oil and emulsion in the fracturing flowback fluid, add a measured amount of demulsifier to the liquid inlet of the settlement tank 3 to separate the oil and water after the emulsion is demulsified;

[0070] (3) Turn on the lifting pump A4, pump the separated oil into the oil storage tank 5, and pump the separated oil into the oil storage tank 5 1 to 3 times a day;

[0071] (4) The fracturing flowback fluid is naturally settled in the settlement tank 3 for one day, and the sand, cuttings and large particles of mechanical impurities in the flowback fluid are settled at the bottom of the tank;

[0072] (5) Turn on the lift pump B6 to pump the upper layer liquid in the settling tank 3 into the fracturing flowbac...

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Abstract

The invention provides a reutilization method and a treatment device for flow-back fracturing fluid, belonging to the technical field of cyclic utilization of fracturing fluid and energy saving and emission reduction in the process of oil and gas exploitation. The method comprises the following steps: allowing the flow-back fracturing fluid to flow back from a wellhead and to pass through a gas-liquid separation device for gas-liquid separation; allowing the obtained liquid to enter a sedimentation tank and carrying out desanding and deoiling; allowing the treated liquid to enter the flow-back fracturing fluid treatment device via a lift pump, carrying out on-line water treatment, and enabling the water quality of the treated liquid to meet the requirement of reutilization through process treatments like ultraviolet sterilization, chemical precipitation for removal of high-valence metal ions, and flocculation and centrifugation for removal of suspended matters; allowing the treated liquid to enter a fracturing fluid mixing tank; testing the water quality of the liquid and analyzing the concentration of residual additives; supplementing lost additives; testing the properties of the fracturing fluid; and carrying out fracturing operation. According to the invention, treatment effect is good; when the treated flow-back fracturing fluid is reutilized, the requirement of fracturing operation is met; thus, the cyclic utilization of the fracturing fluid and energy saving and emission reduction are realized.

Description

technical field [0001] The invention relates to a method and a treatment device for reusing fracturing flowback fluid, and belongs to the technical field of fracturing fluid recycling and energy saving and emission reduction in the oil and gas development process. Background technique [0002] After the oil and gas well fracturing operation is completed, the fracturing fluid pumped into the formation will flow back to the surface. This type of fluid is commonly referred to as frac flowback fluid. Fracturing flowback fluid contains a large amount of additives, formation ions, some mechanical impurities and oil, etc. Direct discharge will seriously pollute the environment, and the technology of harmless treatment is difficult and costly. At present, the treatment methods of fracturing flowback fluid are mainly three ways: reinjection, discharge after treatment, and reuse after treatment. Among them, reinjection needs to drill reinjection wells in suitable formations and inst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F1/20C02F1/52C02F1/38E21B43/26
Inventor 熊颖刘友权吴文刚张倩陈鹏飞孙川张亚东
Owner PETROCHINA CO LTD
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