Recyclable surfactant fracturing fluid and reutilization method

A technology of surfactant and fracturing fluid, applied in the field of fracturing fluid, can solve problems that have not occurred yet, and achieve the effects of good technical prospects, good residual fluid recovery and utilization, and saving water for fluid preparation and chemical additives

Inactive Publication Date: 2013-01-02
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At present, domestic research and application reports on the recovery of surfactant fracturing fluid systems have not yet appeared, so

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0032] Example 1

[0033] As a preferred embodiment of the present invention, the recoverable surfactant fracturing fluid includes the following components by weight mixed:

[0034] Recyclable surfactant fracturing fluid thickener: 8 parts;

[0035] Clear water: 100 servings;

[0036] The recyclable surface active agent fracturing fluid thickener is made of 65% C 21 H 49 O 3 N 3 , 10%CH 3 CH 2 OH and 25%H 2 A mixture of O, where C 21 H 49 O 3 N 3 It is a paste of polyhydroxy quaternary ammonium salt, the structural formula is CH 3 -(CH 2 ) 18 -CH-C(NH 2 OH) 3 , Those skilled in the art can formulate it if they know the structural formula and name.

Example Embodiment

[0037] Example 2

[0038] As the most preferred embodiment of the fracturing fluid, the recoverable surfactant fracturing fluid includes the following components by weight mixed:

[0039] Recyclable surface active agent fracturing fluid thickener: 5-10 parts;

[0040] Potassium chloride solution: 100 parts;

[0041] The recyclable surfactant fracturing fluid thickener is composed of a mass ratio of 55-65% C 21 H 49 O 3 N 3 , 5-15%CH 3 CH 2 OH and 25-35%H 2 A mixture of O, where C 21 H 49 O 3 N 3 It is a paste of polyhydroxy quaternary ammonium salt, the structural formula is CH 3 -(CH 2 ) 18 -CH-C(NH 2 OH) 3 , The mass concentration of the potassium chloride solution is 0.5%-4.0%.

Example Embodiment

[0042] Example 3

[0043] As another preferred embodiment of the present invention, the method for reusing the recoverable surfactant fracturing fluid includes the following steps:

[0044] a. Take 5-10 parts of recyclable surfactant fracturing fluid thickener and 100 parts of clean water; the recyclable surfactant fracturing fluid thickener is composed of 55% C by mass 21 H 49 O 3 N 3 , 15%CH 3 CH 2 OH and 30%H 2 O composition mixture;

[0045] b. In step a, the above-mentioned parts by weight of the recyclable surfactant fracturing fluid thickener and the above parts by weight of the water or potassium chloride solution are passed into the sand mixer and directly mixed to form a recyclable surfactant fracturing fluid ;

[0046] c. Fracturing and hydraulically fracturing the recyclable surfactant mixed in step b into the cracks opened in the oil and water well formation at a temperature of 0°C to 150°C;

[0047] d. Shut down the well for 0.5-3.0 hours after fracturing, control the bl...

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PUM

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Abstract

The invention discloses a recyclable surfactant fracturing fluid, relating to the technical field of fracturing fluids used in oil production. The recyclable surfactant fracturing fluid comprises the following components in parts by weight: 5-10 parts of recyclable surfactant fracturing fluid thickener and 100 parts of clear water or potassium chloride solution. The invention also provides a reutilization method of the fracturing fluid. After the fracturing fluid is used for fracturing construction, the viscosity breaking flow-back liquid can be used for fracturing fluid preparation again without chemical treatment, thereby developing a new way for fully utilizing the surfactant fracturing fluid.

Description

[0001] technical field [0002] The invention relates to the technical field of fracturing fluid used in oil exploitation, in particular to a method for reusing surfactant fracturing fluid. Background technique [0003] With the deepening of exploration and development of low-permeability oilfields, a large number of low-permeability and ultra-low-permeability reservoirs have entered the stage of large-scale development. Large-scale fracturing methods such as horizontal well fracturing and volume fracturing have gradually become the main technologies for oil and gas field development. With the expansion of fracture scale, the amount of flowback fluid after fracturing has also increased sharply. The limited well site space and conventional wastewater treatment technology cannot meet the rapid reuse of flowback wastewater after fracturing. How to effectively treat the flowback wastewater after fracturing It has become a bottleneck restricting large-scale fracturing. There...

Claims

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Application Information

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IPC IPC(8): C09K8/68
Inventor 任雁鹏马托徐洋蒋文学赵晨君葛海江柴巧玲王坤黄永章
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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