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Water base fracture drag reducer

A water-based fracturing and liquid blocking technology, applied in the directions of drilling compositions, chemical instruments and methods, etc., can solve the problems such as the inability to effectively increase the construction displacement and the large friction resistance of the liquid pipeline, and achieve fast dispersion speed, Avoid agglomeration, low cost effect

Inactive Publication Date: 2014-06-11
SOUTHWEST PETROLEUM UNIV
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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 provide a water-based fracturing drag reducing fluid, which aims at the problem that the construction displacement cannot be effectively increased due to the high friction of the liquid pipeline during the hydraulic fracturing process. Inverse emulsion is used as drag reducer to reduce pipeline friction during hydraulic fracturing construction, increase construction displacement and reduce construction pressure

Method used

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  • Water base fracture drag reducer
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Examples

Experimental program
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Effect test

Embodiment 1

[0016] Preparation of drag reducer (the following substances are all parts by weight): After dissolving 25 parts of dimethylaminoethyl methacrylate chloroalkyl quaternary ammonium salt and 12 parts of acrylamide monomer in 25 parts of water, slowly add it dropwise to 34.9 parts In a mixed solution of white oil and 3 parts of span80, under the trigger of 0.1 part of azobisisobutyronitrile, stir at 50° C. for 10 h.

[0017] Slowly add 0.02 g of the drag reducer emulsion prepared in the previous step into 99.48 g of water, stir vigorously to completely disperse the emulsion, then add 0.5 g of 3% by weight of FS-300 methanol solution, and stir vigorously for 30 minutes to obtain the pressure reducing agent of the present invention. Cracking resistance fluid.

Embodiment 2

[0019] Slowly add 0.05 g of the drag reducer emulsion prepared in Example 1 to 99.25 g of water dropwise, stir vigorously to completely disperse the emulsion, then add 0.7 g of 3% by weight of FS-300 methanol solution, and stir vigorously for 30 minutes to obtain the present invention Fracturing drag reducing fluid.

Embodiment 3

[0021] Slowly add 0.1 g of the drag reducer emulsion prepared in Example 1 dropwise into 98.9 g of water, stir vigorously to completely disperse the emulsion, then add 1 g of 3% by weight Intechem-06 methanol solution, and stir vigorously for 30 minutes to obtain the pressure reducing agent of the present invention. Cracking resistance fluid.

[0022] 2. Performance test of a water-based fracturing drag reducing fluid

[0023] The samples of Examples 1-3 were tested according to the standard SY / T5107-1995 to test the drag reduction performance of the samples of Examples relative to clear water, and the results are shown in Table 1.

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Abstract

The invention discloses a water base fracture drag reducer which comprises the following components by percentage: 0.02-0.1% of drag reducer, 0.5-1% of conditioner and the balance of water. The drag reducer is an inverse emulsion which is prepared by the following steps of: dissolving 25 parts of methylacrylic acid dimethylamino ethyl ester chloro quaternary ammonium salt and 12 parts of acrylamide monomer in 25 parts of water; slowing dropwise adding to mixed liquor of 34.9 parts of white oil and 3 parts of span80 or span60; and under initiation of 0.1 part of azodiisobutyronitrile, stirring for 10 hours at 50 DEG C. The conditioner is methanol liquor of an ethoxyl non-ionic fluorocarbon surfactant with weight percentage of 3%. In order to solve the problem that friction of a liquid pipeline in the hydrofracture process is great and construction displacement cannot be effectively improved, the inverse emulsion is used as the drag reducer to reduce the friction of the pipeline in the hydrofracture process, so that the construction displacement is improved and the construction pressure is improved.

Description

technical field [0001] The invention relates to a water-based fracturing drag reducing fluid in the field of production stimulation and transformation in the development process of oil and gas fields. Background technique [0002] Hydraulic fracturing in oil field stimulation measures requires the use of high-pressure equipment on the ground to pump liquid into the formation at high speed, forming a fracture in the reservoir, and carrying sand into the reservoir to support the fracture. During the construction process, the flow rate of the fluid is very fast, and the pipeline friction is quite large, which leads to the inability to effectively increase the construction displacement, and affects the sanding intensity and scale of the fracturing process. Therefore, a low-friction fracturing fluid is needed in the hydraulic fracturing process to reduce pipeline friction in the construction process, so as to increase the strength and scale of sand addition, and achieve the optim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68
Inventor 李勇明王松赵金洲王雷申峰张烨米强波乔红军吴金桥
Owner SOUTHWEST PETROLEUM UNIV
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