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Variable-viscosity slickwater and preparation method thereof

A slick water and stick-slip technology is applied in the field of viscous slick water and its preparation, which can solve the problems of large difference in viscosity of slick water systems, and achieve the effects of easy popularization, easy flowback and simple preparation method.

Inactive Publication Date: 2021-08-06
SOUTHWEST PETROLEUM UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a viscous slick water for the current problem that the strong heterogeneity of shale in my country and the large difference in reservoir stress require a large difference in viscosity of the slick water system. Adjustable, strong adaptability, to meet the online mixing requirements of slick water required for different shale gas horizontal well fracturing fluids

Method used

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  • Variable-viscosity slickwater and preparation method thereof

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Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment prepares a viscous and slippery water, and its formula is calculated by mass fraction: acrylamide, acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, dimethyl allyl octadecyl chloride Ammonium 0.05%, sodium dodecylbenzenesulfonate 0.1%, potassium chloride 1%, sodium lauryl lauryl sulfate 1%, and the balance is water.

[0029] Its specific preparation method is:

[0030] S1: preparation of drag reducer;

[0031] S11: first dissolve acrylamide, acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid, dimethyl allyl octadecyl ammonium chloride, etc. In deionized water, 0.02% azobisisobutylamidine hydrochloride was used as an initiator at 45° C. for 4 hours for dispersion polymerization to obtain a drag reducer.

[0032] S2: According to the above formula, add the drag reducer, viscosity-increasing additive, anti-swelling agent, and drainage aid prepared in step S1 into water, and stir and mix evenly to obtain viscous slippery water A.

Embodiment 2

[0034] This embodiment prepares a kind of viscous slippery water, and its formula is counted as in mass fraction: dimethyl allyl octadecyl ammonium chloride is the drag reducing agent 0.2% of hydrophobic monomer, dodecylbenzenesulfonic acid Sodium 1%, potassium chloride 0.3%, sodium lauryl lauryl sulfate 0.3%, and the balance is water.

[0035] Its specific preparation method is:

[0036] S1: preparation of drag reducer;

[0037] S11: First, dissolve acrylamide, acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid, dimethyl allyl octadecyl ammonium chloride, etc. In deionized water, 0.02% azobisisobutylamidine hydrochloride was used as an initiator at 50° C. for 4 hours to carry out dispersion polymerization to synthesize a drag reducer.

[0038] S2: According to the above formula, add the drag reducer, viscosity-increasing additive, anti-swelling agent, and drainage aid prepared in step S1 into water, and stir and mix evenly to obtain viscous slippery water B.

Embodiment 3

[0040] This embodiment prepares a kind of viscous slippery water, and its formula is counted as in mass fraction: dimethyl allyl octadecyl ammonium chloride is the drag reducing agent 0.12% of hydrophobic monomer, dodecylbenzenesulfonic acid Sodium 0.6%, potassium chloride 0.5%, sodium lauryl lauryl sulfate 0.7%, and the balance is water.

[0041] Its specific preparation method is:

[0042] S1: preparation of drag reducer;

[0043] S11: First, dissolve acrylamide, acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid, dimethyl allyl octadecyl ammonium chloride, etc. In deionized water, 0.02% azobisisobutylamidine hydrochloride was used as an initiator at 60° C. for 4 hours to carry out dispersion polymerization to synthesize a drag reducer.

[0044] S2: According to the above formula, add the drag reducer, viscosity-increasing additive, anti-swelling agent, and drainage aid prepared in step S1 into water, and stir and mix evenly to obtain viscous and slippery water C.

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Abstract

The invention discloses variable-viscosity slickwater and preparation method and application thereof, and relates to the technical field of shale gas development. The slickwater is prepared from the following components: 0.05 to 0.2 percent of a drag reducer, 0.1 to 1 percent of a variable-viscosity auxiliary agent, 0.3 to 1 percent of an anti-swelling agent, 0.3 to 1 percent of a cleanup additive and the balance of water. The invention further discloses a preparation method of the variable-viscosity slickwater. The preparation method comprises the following steps: S1, preparing the drag reducer; and S2, according to the formula in the claim 1, adding the drag reducer prepared in the step S1, the variable-viscosity additive, the anti-swelling agent and the discharge aiding agent into water, and uniformly stirring and mixing to obtain the variable-viscosity slickwater. According to the variable-viscosity slickwater, the variable-viscosity auxiliary agent is added into the system so that the viscosity of the variable-viscosity slickwater is adjustable, the adaptability is high, and the on-line blending requirements of the slickwater required by different shale gas horizontal well fracturing fluids are met.

Description

technical field [0001] The invention belongs to the technical field of fracturing fluid for oil and gas development, and in particular relates to viscous slippery water and a preparation method thereof. Background technique [0002] Slippery water is a fracturing fluid system for underwater fracturing of shale oil and gas reservoirs, and is one of the key fluids for shale gas development. Compared with the traditional gel fracturing fluid system, the slick water fracturing fluid system is widely used in shale gas development because of its high efficiency and low cost. Slippery water hydraulic fracturing technology and horizontal well technology are the core technologies mainly adopted in shale gas exploitation in the United States. my country is rich in low-permeability and ultra-low-permeability oil and gas resources, and slickwater fracturing technology plays a pivotal role in the development process , so the slick water fracturing technology is also one of the key fractu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/88C08F220/56C08F220/06C08F220/58C08F226/02
CPCC09K8/68C09K8/882C08F220/56
Inventor 张太亮郑存川付玉龙徐晨阳刘福川
Owner SOUTHWEST PETROLEUM UNIV
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