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A kind of gas well high temperature resistant recyclable clean fracturing fluid

A technology of clean fracturing fluid and high temperature resistance, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of poor high temperature resistance and inability to recycle and reuse, so as to reduce the cost of fracturing construction and ensure green Environmental protection production, good compatibility effect

Active Publication Date: 2017-10-17
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems that existing fracturing fluids have poor high temperature resistance and cannot be recycled and reused after fracturing

Method used

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  • A kind of gas well high temperature resistant recyclable clean fracturing fluid
  • A kind of gas well high temperature resistant recyclable clean fracturing fluid
  • A kind of gas well high temperature resistant recyclable clean fracturing fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A gas well high temperature resistant recyclable clean fracturing fluid, the raw materials used in the fracturing fluid and the weight percentages of each component are as follows:

[0035] Thickener, 1%;

[0036] Potassium chloride, 0.5%;

[0037] Water, 98.5%.

[0038] Described thickening agent is made up of the raw material of following mass ratio:

[0039] 35%, 3-trimeric epoxyhexafluoropropane amidopropyl betaine;

[0040] 10%, coconut oil fatty acid diethanolamine;

[0041] 1%, co-solvent;

[0042] 54%, water.

[0043] The co-solvent is a mixture of methanol and isopropanol, and the mass ratio of methanol to isopropanol is 1:3.

[0044] In this example, the high temperature-resistant recyclable clean fracturing fluid of the gas well has a thickening time of less than 20s, and the viscosity is at least 25mPa·s at normal ground temperature (25°C), and the viscosity is ≤5mPa when the formation temperature is greater than 130°C s; high temperature resistant re...

Embodiment 2

[0046] A gas well high temperature resistant recyclable clean fracturing fluid, the raw materials used in the fracturing fluid and the weight percentages of each component are as follows:

[0047] Thickener, 4%;

[0048] Potassium chloride, 5%;

[0049] Water, 91%.

[0050] Described thickening agent is made up of the raw material of following mass ratio:

[0051] 55%, 3-trimeric epoxyhexafluoropropane amidopropyl betaine;

[0052] 25%, coconut oil fatty acid diethanolamine;

[0053] 5%, co-solvent;

[0054] 15%, water.

[0055] The cosolvent is a mixture of methanol and isopropanol, and the mass ratio of methanol to isopropanol is 1:5.

[0056] In this example, the high temperature-resistant recyclable clean fracturing fluid of the gas well has a thickening time of less than 20s, and the viscosity is at least 25mPa·s at normal ground temperature (25°C), and the viscosity is ≤5mPa when the formation temperature is greater than 130°C s; high temperature resistant recycla...

Embodiment 3

[0058] A gas well high temperature resistant recyclable clean fracturing fluid, the raw materials used in the fracturing fluid and the weight percentages of each component are as follows:

[0059] Thickener, 1.5%;

[0060] Potassium chloride, 1.0%;

[0061] Water, 97.5%.

[0062] Described thickening agent is made up of the raw material of following mass ratio:

[0063] 40%, 3-trimeric epoxyhexafluoropropane amidopropyl betaine;

[0064]14%, coconut oil fatty acid amide;

[0065] 3%, co-solvent;

[0066] 43%, water.

[0067] The cosolvent is a mixture of methanol and isopropanol, and the mass ratio of methanol to isopropanol is 1:10.

[0068] In this example, the high temperature-resistant recyclable clean fracturing fluid of the gas well has a thickening time of less than 20s, and the viscosity is at least 25mPa·s at normal ground temperature (25°C), and the viscosity is ≤5mPa when the formation temperature is greater than 130°C s; high temperature resistant recyclable...

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Abstract

The invention provides high-temperature-resistant recyclable clean fracturing fluid for gas wells. The high-temperature-resistant recyclable clean fracturing fluid comprises, by weight, 1%-4% of thickening agents, 0.5%-5% of potassium chloride and the balance water. The high-temperature-resistant recyclable clean fracturing fluid for the gas wells has the advantages that the fracturing construction cost can be reduced, the high-temperature-resistant recyclable clean fracturing fluid can be recycled and is free of residues, good in compatibility and low in friction resistance and harm, gel breaking can be easily implemented, and continuous mixed sand fracturing construction can be implemented by the aid of the high-temperature-resistant recyclable clean fracturing fluid for the gas wells; a certain quantity of defoaming agents can be added into flowback fluid after fracturing construction is completed, so that the high-temperature-resistant recyclable clean fracturing fluid can be used for preparing fracturing fluid, and environment-friendly production and sustainable development of the gas wells can be guaranteed.

Description

technical field [0001] The invention belongs to the technical field of fracturing fluid for fracturing and increasing production in the process of oil and gas development, and in particular relates to a high-temperature-resistant recyclable clean fracturing fluid for gas wells. Background technique [0002] At present, the water-based fracturing fluid commonly used in fracturing construction in Changqing Oilfield is hydroxypropyl guaridine fracturing fluid system. The situation is grim, and guar gum fracturing fluid cannot be recycled and reused after fracturing, which brings huge pressure to the environmental protection situation. In view of the above problems, there is an urgent need to develop new and alternative fracturing fluids that can be recovered. [0003] At present, there are many sets of fracturing fluid systems at home and abroad. Among them, clean fracturing fluid has been proposed for more than ten years. A series of products with certain temperature resistan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68C09K8/86
CPCC09K8/68C09K8/86
Inventor 孙虎王祖文张冕高燕王改红邵秀丽陈亚联陈世波高红平
Owner BC P INC CHINA NAT PETROLEUM CORP
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