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A kind of oil well recyclable gemini surfactant water-based fracturing fluid and preparation method thereof

A Gemini surface, water-based fracturing technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of high cost, non-recyclable, etc., and achieve small oil layer damage, low water quality requirements, and good salt resistance Effect

Active Publication Date: 2018-09-04
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD CHANGQING DOWNHOLE TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Currently commonly used viscoelastic surfactant fracturing fluid (VES) fracturing fluid is not recyclable, and the cost is high

Method used

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  • A kind of oil well recyclable gemini surfactant water-based fracturing fluid and preparation method thereof
  • A kind of oil well recyclable gemini surfactant water-based fracturing fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Select 98.85 parts of Gemini surfactant fracturing fluid flowback fluid from the second section of Chenping 15-XX well after sand settling, filtering, etc., and then storing in a water storage tank.

[0044] Adjust the flow rate of the fracturing truck circulating pump connected to the storage tank to 600L / min, and slowly add 1 part of clay stabilizer to the filtered Gemini surfactant fracturing fluid flowback fluid, and the fracturing truck circulating pump will circulate Work for 10-12min, then add 0.1 part of micellar enhancer and 0.05 part of micellar enhancer, circulate for 8-10min, let stand for 1h, observe whether the solution has stratification or precipitation, if so, continue to circulate for 15-20min , Until there is no stratification, no precipitation, that is to form a base fluid. Adjust the flow of the fracturing truck circulating pump to between 600-700L / min, and then add 0.5 parts of Gemini surfactant thickener through the funnel-shaped feeding device to mi...

Embodiment 2

[0047] Select 95.8 parts of Gemini surfactant fracturing fluid flowback fluid from the first section of Linping 89-XX well after sand settling, degreasing and filtering, and then stored in a water storage tank.

[0048] Adjust the flow rate of the fracturing truck circulating pump connected to the storage tank to 600L / min, slowly add 2 parts of clay stabilizer to the sedimented Gemini surfactant fracturing fluid flowback fluid, and circulate for 10-12 minutes, then Add 0.55 parts of micellar accelerator and 0.125 parts of micellar synergist, circulate for 8-10 minutes, let stand for 1 hour, observe whether the solution has stratification or precipitation, if so, continue to circulate for 15-20 minutes until no stratification, Without precipitation, the base fluid is formed. Adjust the flow of the fracturing truck circulating pump to between 600-700L / min, and then add 1 part of Gemini surfactant thickener through the funnel-shaped feeding device to mix the thickener with the fract...

Embodiment 3

[0051] Select 95.8 parts of Gemini surfactant fracturing fluid flowback fluid from the 10th section of Well Chuanping 54-XX after sand settling and degreasing, and then stored in a water storage tank.

[0052] Adjust the flow rate of the fracturing truck circulating pump connected to the storage tank to 600L / min, slowly add 3 parts of clay stabilizer to the Gemini surfactant fracturing fluid flowback after precipitation, and circulate for 10-12 minutes, then Add 1 part of micellar accelerator and 0.2 part of micellar synergist, circulate for 8-10min, let stand for 1h, observe whether the solution has stratification or precipitation, if so, continue to circulate for 15-20min, until no stratification, Without precipitation, the base fluid is formed. Adjust the flow of the fracturing truck circulating pump to between 600-700L / min, and then add 1.5 parts of Gemini surfactant thickener through the funnel-shaped feeding device to mix the thickener with the fracturing fluid base fluid, ...

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Abstract

The invention provides a gemini surfactant water-based recoverable fracturing fluid for an oil well and a preparation method thereof. The gemini surfactant water-based recoverable fracturing fluid is prepared from 98.5-99.5 parts of a base fluid and 0.5-1.5 parts of a surfactant thickening agent, wherein the base fluid is prepared from 95.8-98.85 parts of a gemini-surfactant fracturing fluid backflow fluid, 1.0-3.0 parts of a clay stabilizer, 0.05-0.20 parts of a micelle synergist and 0.1-1.0 part of a micelle accelerator. The preparation method of the gemini surfactant water-based recoverable fracturing fluid comprises the following steps: (1) removing mechanical impurities from the gemini-surfactant fracturing fluid backflow fluid; (2) feeding the gemini-surfactant fracturing fluid backflow fluid without impurities into a stirrer; (3) feeding the clay stabilizer, the micelle synergist and the micelle accelerator into the stirrer in sequence; (4) stirring; and (5) adding the gemini-surfactant thickening agent, and further stirring. The viscoelastic fracturing fluid can be prepared by adopting the preparation method provided by the invention, and the temperature resistance, anti-shearing capacity and sand carrying capacity of the gemini surfactant water-based recoverable fracturing fluid can meet the conventional oil-well fracturing requirements.

Description

Technical field [0001] The invention relates to a water-based fracturing fluid of recyclable gemini surfactants for oil wells and a preparation method thereof. Background technique [0002] Fracturing acidification has become an important method for stimulation and improvement of oil and gas wells. At present, water-based fracturing fluids are the main fracturing fluids used in domestic oil wells during fracturing, and plant-based fracturing fluids dominate in water-based fracturing fluids (plant-based fracturing fluids account for approximately More than 60%). Plant glue fracturing fluid has a wide range of sources and low prices, so it has been widely used by major oil fields at home and abroad for many years. Then, with the increase of horizontal oil wells and the application of volume fracturing technology, the vegetable glue fracturing fluid caused a waste of water resources during the flowback process after fracturing, and also brought great pollution to the environment. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68
CPCC09K8/602C09K8/68C09K2208/26C09K2208/30
Inventor 陈亚联廖乐军韩文哲祁俊武樊炜高红平李海波樊启国梁陇霞宋超王科萌王瑜卫娟陈世波申强
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD CHANGQING DOWNHOLE TECH CO