Sea-land transition phase shale gas pressure fracturing fluid, preparation method and applications thereof

A shale and gas pressure technology, which is applied in the fields of fracturing fluid for shale gas fracturing, shale gas tight gas reservoir stimulation, VCR radical fracturing fluid for shale gas fracturing in sea-land transitional facies and its preparation, It can solve the problems of incomplete gel breaking, large reservoir damage, long swelling time, etc., and achieve the effect of strong sand-carrying performance, wide temperature range and complete gel breaking.

Inactive Publication Date: 2018-04-13
陕西森瑞石油技术开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at the same time, due to the small pore throat and low permeability of the reservoir, the fracturing fluid with conventional guar gum and guar gum derivatives takes a long time to swell, the gel is not completely broken, and it is not easy to flow back. Larger, it is easy to cause pore throat blockage, which will cause greater damage to the reservoir

Method used

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  • Sea-land transition phase shale gas pressure fracturing fluid, preparation method and applications thereof
  • Sea-land transition phase shale gas pressure fracturing fluid, preparation method and applications thereof
  • Sea-land transition phase shale gas pressure fracturing fluid, preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] This example provides a preferred shale gas fracturing fluid with transitional marine-terrestrial facies, denoted as 1# fracturing fluid, in terms of mass percentage, its formula consists of: 0.3% thickener, 0.3% anti-swelling agent, auxiliary 0.3% row synergist, 0.3% water lock treatment agent, 0.3% foaming agent, 0.5% potassium chloride, 0.1% organic boron zirconium crosslinking agent, 0.01% gel breaker, and 97.89% water.

[0037] In this embodiment, the thickener is VCR radical polyacrylamide with a molecular weight of 200. The drainage aid synergist is SR18Y fluorocarbon surfactant. The water-locking treatment agent can be composed of fluorocarbon surfactant, gemini quaternary ammonium salt, and water. Described foaming agent selects sodium lauryl sulfate for use. The breaker is ammonium persulfate.

[0038] This system is suitable for the formation temperature within 80°C.

[0039] The preparation method of the shale gas fracturing fluid in transitional marine-...

Embodiment 2

[0055] This example provides a preferred shale gas fracturing fluid with transitional marine-terrestrial facies, which is denoted as 2# fracturing fluid. In terms of mass percentage, its formula consists of: 0.5% thickener, 0.4% anti-swelling agent, 0.35% row synergist, 0.4% water lock treatment agent, 0.4% foaming agent, 0.5% potassium chloride, 0.5% organic boron zirconium crosslinking agent, 0.05% gel breaker, and 96.9% water.

[0056] In this embodiment, the thickener is VCR radical polyacrylamide with a molecular weight of 3 million. The drainage aid synergist is SR18Y fluorocarbon surfactant. Described water locking treatment agent is with embodiment 1. Described foaming agent selects sodium lauryl sulfate for use. The gel breaker is potassium persulfate.

[0057] The system is suitable for fracturing systems with temperatures within 120°C.

[0058] The preparation method of 2# fracturing fluid may further comprise the steps:

[0059] 1) Preparation of base liquid ...

Embodiment 3

[0073] This example provides a preferred shale gas fracturing fluid with transitional marine-terrestrial facies, which is denoted as 3# fracturing fluid. In terms of mass percentage, its formula consists of: 0.6% thickener, 0.5% anti-swelling agent, 0.4% row synergist, 0.5% water lock treatment agent, 0.5% foaming agent, 0.5% potassium chloride, 1% organic boron zirconium crosslinking agent, 0.1% gel breaker, and 95.9% water.

[0074] In this embodiment, the thickener is VCR radical polyacrylamide with a molecular weight of 5 million. The drainage aid synergist is TF-1 fluorocarbon surfactant. Described water locking treatment agent is with embodiment 1. Described foaming agent selects sodium lauryl sulfate for use. The gel breaker is potassium persulfate.

[0075] The preparation method of 3# fracturing fluid may further comprise the steps:

[0076] 1) Preparation of base liquid

[0077] Under stirring conditions, add 0.6kg thickener to 95.9kg water, after the thickener ...

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Abstract

The invention belongs to the technical field of oil-gas field gas extraction production, and discloses a sea-land transition phase shale gas pressure fracturing fluid, which comprises, by mass, 0.3-0.6% of a thickening agent, 0.3-0.5% of an anti-swelling agent, 0.3-0.4% of a cleanup synergist, 0.3-0.5% of a water lock treatment agent, 0.3-0.5% of a foaming agent, 0.5% of an inorganic salt, 0.1-1%of an organic boron-zirconium cross-linking agent, 0.01-0.1% of a gel breaker, and the balance of water. According to the present invention, the VCR radical polymer is used as the thickening agent, and reacts with the organic boron-zirconium cross-linking agent to form the jelly; and the sea-land transition phase shale gas pressure fracturing fluid has advantages of good temperature resistance, good shear resistance, strong sand-carrying performance, complete gel breaking and no residue, and is especially suitable for the fracturing transformation of low permeability and extra low permeabilityreservoirs.

Description

technical field [0001] The invention belongs to the technical field of gas recovery and production in oil and gas fields, and relates to a fracturing fluid for shale gas fracturing, in particular to a VCR free radical fracturing fluid for shale gas fracturing in transitional marine-terrestrial facies and a preparation method thereof. The fracturing fluid of the invention is especially suitable for the reconstruction of tight gas reservoirs of shale gas. Background technique [0002] With the increasing global demand for oil and gas resources, the proportion of unconventional oil and gas resources in oil and gas resources is increasing, and the focus of exploration and development of oil and gas resources is gradually shifting to unconventional ultra-low permeability oil and gas reservoirs. At present, the proven reserves of low-permeability oil reservoirs in my country account for more than 70% of the total reserves, which is the focus and difficulty of future development. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/88
CPCC09K8/602C09K8/685C09K8/887C09K2208/26
Inventor 李养池张永生邢恩袁田义陈杰马林
Owner 陕西森瑞石油技术开发有限公司
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