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Working fluid system suitable for shale oil exploitation and application thereof

A working liquid and liquid mixing technology, which is applied in the direction of mining fluid, earthwork drilling, drilling composition, etc., can solve the problems of difficult oil-water separation, incomplete gel breaking of sand-carrying fluid, and influence on construction effect, etc., to achieve low viscosity , the effect of easily cracking the network

Inactive Publication Date: 2021-09-07
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Most of the currently used sand-carrying fluids are polymers. At the end of fracturing, the sand-carrying fluid is prone to incomplete gel breaking. The produced shale oil contains a large amount of gel-like substances, which makes it difficult to separate oil from water. , affecting the construction effect, the present invention provides a working fluid system suitable for shale oil exploitation

Method used

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  • Working fluid system suitable for shale oil exploitation and application thereof
  • Working fluid system suitable for shale oil exploitation and application thereof
  • Working fluid system suitable for shale oil exploitation and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] A working fluid system suitable for shale oil exploitation, the working fluid system consists of two parts;

[0032] The first part is slick water, which is composed of cationic polyacrylamide and liquid mixing medium; cationic polyacrylamide is obtained by polymerization of dimethyl diallyl ammonium chloride and acrylamide;

[0033] The second part is the sand-carrying liquid. The sand-carrying liquid is composed of a cationic viscoelastic surfactant and a solution medium. The cationic viscoelastic surfactant is 4-amino-3,5-dimethylol-1,2-double ten Hexaalkylammonium bromide;

[0034] The mass fraction of cationic polyacrylamide in the slick water is 0.05%; the mass fraction of cationic viscoelastic surfactant in the sand-carrying fluid is 0.6%; the liquid preparation medium is clear water.

Embodiment 2

[0036] A working fluid system suitable for shale oil exploitation, the working fluid system consists of two parts;

[0037] The first part is slick water, which is composed of cationic polyacrylamide and liquid mixing medium; cationic polyacrylamide is obtained by polymerization reaction of acrylamide and methacryloyloxyethyltrimethylammonium chloride;

[0038]The second part is the sand-carrying liquid. The sand-carrying liquid is composed of a cationic viscoelastic surfactant and a liquid preparation medium. The cationic viscoelastic surfactant is dimethylene-1,2-bis(dodecyl dimethyl bromide ammonium chloride);

[0039] The mass fraction of the cationic polyacrylamide in the slick water is 0.05%; the mass fraction of the cationic viscoelastic surfactant in the sand-carrying liquid is 0.6%; the liquid preparation medium is an aqueous solution containing soluble inorganic salts.

Embodiment 3

[0041] A working fluid system suitable for shale oil exploitation, the working fluid system consists of two parts;

[0042] The first part is slick water, which is composed of cationic polyacrylamide and liquid mixing medium; cationic polyacrylamide is obtained by polymerization of acrylamide and hexadecyl dimethyl allyl ammonium chloride;

[0043] The second part is the sand-carrying liquid, which is composed of a cationic viscoelastic surfactant and a liquid mixing medium, dimethylene-1,2-bis(tetradecyldimethylammonium bromide);

[0044] The mass fraction of the cationic polyacrylamide in the slick water is 0.08%; the mass fraction of the cationic viscoelastic surfactant in the sand-carrying liquid is 0.8%; the liquid preparation medium is an aqueous solution containing soluble inorganic salts.

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Abstract

The invention discloses a working fluid system suitable for shale oil exploitation and an application of the working fluid system, and belongs to the technical field of oil and gas exploitation. The working fluid system consists of two parts; the first part is slickwater, and the slickwater is composed of cationic polyacrylamide and a liquid preparation medium; the second part is sand-carrying fluid, the sand-carrying fluid is composed of a cationic viscoelastic surfactant and a fluid preparation medium, and the number of carbon atoms of a carbon chain in the cationic viscoelastic surfactant is 10-25; the cationic viscoelastic surfactant of which the carbon atom number of a carbon chain is 10-25 is adopted as a small molecule compound, and when the cationic viscoelastic surfactant is diluted by oil or a large amount of formation water, automatic gel breaking can be achieved, gel breaking is thorough, and residues cannot be generated; the slickwater prepared from the cationic polyacrylamide compound has low viscosity, is easier to generate a complex crack network, and is beneficial to flowback after construction is finished.

Description

technical field [0001] The invention belongs to the technical field of oil and gas exploitation, and in particular relates to a working fluid system suitable for shale oil exploitation and the application of the working fluid system. Background technique [0002] With the gradual consumption and depletion of global conventional oil and gas resources and the increasing energy demand for economic and social development, the contradiction between supply and demand of oil and gas has become more and more serious. The exploration and development of oil and gas industry began to focus on unconventional resources. , unconventional resources are more and more people's attention and attention. Shale oil refers to the oil resources contained in shale-based shale formations. It is an important unconventional oil and gas resource and a potential substitute for traditional oil resources. Shale oil includes mud shale pores and oil in fractures, as well as oil resources in tight carbonati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/88E21B43/267
CPCC09K8/68C09K8/602C09K8/882E21B43/267C09K2208/30
Inventor 鲁红升戴姗姗贾振福王愉杨立君吴洋
Owner SOUTHWEST PETROLEUM UNIV