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Clean high-temperature water-base fracturing fluid

A high-temperature water, clean technology, applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as insufficient temperature resistance of clean fracturing fluids, achieve good sand suspension ability, reduce operating costs, and achieve high temperature resistance. The effect of boosting

Inactive Publication Date: 2018-02-09
河北中大永迪生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the above-mentioned defects and problems of the prior art, the present invention provides a clean high-temperature water-based fracturing fluid. The technical problem to be solved is: to solve the problem of insufficient temperature resistance of the current clean fracturing fluid, so that it can meet higher To meet the well temperature requirements, while ensuring the fracturing fluid has a good sand-carrying ability, reduce the amount of surfactant in the fracturing fluid and reduce the cost

Method used

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Examples

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Effect test

Embodiment 1

[0030] Example 1: Add 908.5ml of water into a mixer with a capacity of 1500ml, slowly add 5g of xanthan gum under stirring, and stir at a high speed for 5min; then add 10g of potassium chloride, 10g of absolute ethanol, and 0.5g of glutaraldehyde solution g, 50 g of calcium chloride, 16 g of erucamide propyl hydroxysultaine, and stirring for 3 minutes to 5 minutes to obtain the water-based fracturing fluid of the present invention.

[0031] The viscosity-temperature performance of the fracturing fluid in this embodiment is tested, and the rheological performance of the sample is tested by a Brookfield PVS viscometer, and the shear rate is 170s -1 After shearing for 90min, the viscosity-temperature curve of Example 1 was obtained.

[0032] The viscosity-temperature performance of the fracturing fluid in this implementation case is tested, and the performance is as follows: the test temperature is 150°C, and the shear rate is 170s -1 , after 90 minutes, the viscosity remained s...

Embodiment 2

[0033]Example 2: Add 909.5ml of water into a mixer with a capacity of 1500ml, slowly add 5g of sodium carboxymethylcellulose under stirring, and stir at a high speed for 5min; then add 20g of potassium chloride solution, 9g of absolute ethanol, and Dialdehyde solution 0.5g, calcium chloride solution 50g, erucamide propyl hydroxysulfobetaine solution 6g, stirred for 3min-5min to obtain the water-based fracturing fluid of the present invention.

[0034] The rheological properties of the samples were tested by Brookfield PVS viscometer, the shear rate was 170s -1 After shearing for 60 min, the viscosity-temperature curve of Example 2 was obtained.

[0035] The viscosity-temperature performance of the fracturing fluid in this implementation case is tested, and the performance is as follows: the test temperature is 130°C, and the shear rate is 170s -1 , after one hour, the viscosity remained stable at 30.4mPa·s.

Embodiment 3

[0036] Example 3: Add 908.5ml of water into a mixer with a capacity of 1500ml, slowly add 5g of xanthan gum under stirring, and stir at a high speed for 5min; then add 20g of ammonium chloride solution, 10g of isopropanol, dodecyl 0.5g of trimethylammonium chloride, 50g of calcium chloride solution, 6g of betaine amidopropyl betaine, and stirring for 3min-5min, the water-based fracturing fluid of the present invention is obtained.

[0037] The rheological properties of the samples were tested by Brookfield PVS viscometer, the shear rate was 170s -1 After shearing 90min, obtain the viscosity-temperature curve of embodiment 3 image 3 .

[0038] The viscosity-temperature performance of the fracturing fluid in this implementation case is tested, and the performance is as follows: the test temperature is 140°C, and the shear rate is 170s -1 , After 90 minutes, the viscosity was stable at 32mPa·s.

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Abstract

The invention provides clean high-temperature water-base fracturing fluid. The clean high-temperature water-base fracturing fluid comprises components including, by weight, 0.5%-6% of clay stabilizers, 2%-6% of accelerators, 0.01%-0.1% of bactericides, 0.6%-3.0% of alcohol with a low molecular weight, 0.4%-2% of zwitterionic surfactants, 0%-0.5% of polysaccharide compounds and the balance water. The components are mixed with one another to obtain the clean high-temperature water-base fracturing fluid. The clean high-temperature water-base fracturing fluid has the advantages that as proved by indoor evaluation, the temperature resistance of the clean high-temperature water-base fracturing fluid can reach 150 DEG C at least, and accordingly the clean high-temperature water-base fracturing fluid is superior to general clean fracturing fluid systems; the dosage of betaine is 0.4%-2% (a weight ratio) and is far lower than the dosage (2%-5%) of amphoteric surfactants in formulas for conventional fracturing fluid; the clean high-temperature water-base fracturing fluid is convenient to use and operate, excellent in sand suspension ability and superior to common cross-link guar gum and quaternary ammonium salt systems, and cross-link can be omitted.

Description

technical field [0001] The invention relates to the technical field of oil and gas resource development, in particular to a clean high-temperature water-based fracturing fluid. Background technique [0002] Hydraulic fracturing technology has been widely used as an important means to increase production in oilfields, especially in unconventional oil and gas fields such as shale gas and coalbed methane that have attracted much attention. It has set off a technological revolution. In hydraulic fracturing construction, it plays an important role in transmitting pressure and carrying proppant, and is the key to hydraulic fracturing construction. [0003] Currently commonly used polymer pressure fluid thickeners such as modified guar gum, modified cellulose, and polyacrylamide are all macromolecular polymers, which need to be used after cross-linking with a cross-linking agent. After entering the formation, there will be considerable Part of the cross-linked polymer cannot compl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/90
Inventor 魏振强马广华喻翔
Owner 河北中大永迪生物科技有限公司
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