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Composite water-soluble temporary plugging agent for oilfield steering fracturing construction

A water-soluble, temporary plugging agent technology, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems that it is difficult to increase the degree of reservoir production and cannot open new fractures, so as to prolong the shielding time and prevent Desorption and destabilization, enhanced stability effects

Inactive Publication Date: 2020-02-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the above-mentioned prior art, the present invention provides a composite water-soluble temporary plugging agent used in oil field steering fracturing construction, which solves the problem that the traditional fracturing technology in the oil field cannot open new fractures and it is difficult to improve the overall production degree of the reservoir At the same time, the temperature resistance and water solubility of the existing temporary plugging agent for fracturing in oil fields have been improved, which greatly improves the performance of the temporary plugging agent

Method used

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  • Composite water-soluble temporary plugging agent for oilfield steering fracturing construction
  • Composite water-soluble temporary plugging agent for oilfield steering fracturing construction
  • Composite water-soluble temporary plugging agent for oilfield steering fracturing construction

Examples

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Effect test

Embodiment 1

[0022] Embodiment 1 prepares composite water-soluble temporary plugging agent

[0023] The composition of the raw materials in the proportion by weight is as follows: 53.6 parts of the coating material, 29.7 parts of the temporary plugging particles, and 16.7 parts of the temporary plugging fibers.

[0024] The coating material is sodium polyacrylate. The temporary plugging particles are sea salt particles with a particle diameter of 3 mm to 4 mm. The temporary plugging fibers are polyvinyl alcohol fibers with a length of 6 mm and a diameter of 10 μm.

[0025] The preparation method is as follows: firstly uniformly coat the coating material on the surface of the temporary plugging particles to form coating particles, and then mix the temporary plugging fibers and the coating particles evenly to obtain the product.

Embodiment 2

[0026] Embodiment 2 prepares composite water-soluble temporary plugging agent

[0027] The composition of the raw materials in the proportion by weight is as follows: 45.9 parts of the coating material, 25.5 parts of the temporary plugging particles, and 28.6 parts of the temporary plugging fibers.

[0028] The coating material is sodium polyacrylate. The temporary plugging particles are sea salt particles with a particle diameter of 3 mm to 4 mm. The temporary plugging fibers are polyvinyl alcohol fibers with a length of 6 mm and a diameter of 10 μm.

[0029] The preparation method is the same as in Example 1.

Embodiment 3

[0030] Embodiment 3 prepares composite water-soluble temporary plugging agent

[0031] The composition of the raw materials in the proportion by weight is as follows: 40.2 parts of the coating material, 22.3 parts of the temporary plugging particles, and 37.5 parts of the temporary plugging fibers.

[0032] The coating material is sodium polyacrylate. The temporary plugging particles are sea salt particles with a particle diameter of 3 mm to 4 mm. The temporary plugging fibers are polyvinyl alcohol fibers with a length of 6 mm and a diameter of 10 μm.

[0033] The preparation method is the same as in Example 1.

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Abstract

The invention discloses a composite water-soluble temporary plugging agent for oilfield steering fracturing construction, wherein the composite water-soluble temporary plugging agent comprises the following raw materials by weight: 32.1-53.6 parts of a coating material, 17.9-29.8 parts of temporary plugging particles and 16.7-50.0 parts of temporary plugging fibers, wherein the coating material isselected from sodium polyacrylate, sodium carboxymethyl cellulose, bone glue and gelatin, the temporary plugging particles are selected from sea salt particles, potassium chloride particles, calciumcarbonate particles and calcium chloride particles, and the temporary plugging fibers are selected from polyvinyl alcohol fibers, polyester fibers, asbestos fibers and cotton fibers. According to theinvention, the composite water-soluble temporary plugging agent is suitable for plugging cracks with millimeter-scale crack widths, can resist a temperature of 120-140 DEG C, has a plugging pressure gradient peak value of more than 30 MPa / m, and can be completely dissolved into a clear liquid with a viscosity close to the viscosity of water within 2 h at 140 DEG C; and the composite water-solubletemporary plugging agent has characteristics of large plugging pressure gradient, short plugging removal time, no damage to stratum and the like.

Description

technical field [0001] The invention relates to a composite water-soluble temporary plugging agent used in oilfield diversion fracturing construction, and belongs to the technical field of oilfield diversion fracturing. Background technique [0002] At present, with the increasing degree of development, the water content of thick oil-layer reservoirs gradually increases, and groundwater channels are gradually formed. If the refracturing technology is used to fracturing the reservoir, although the length of the old fractures is extended to a certain extent, and the fractured area is not used for the reservoir, but on the other hand, the technology will reduce the formation water. The expansion of the channel is not conducive to the long-term effective development of the reservoir. Temporary plugging agent diversion fracturing technology can solve this kind of problem. Temporary plugging agent diversion fracturing technology refers to injecting temporary plugging agent downho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/508
CPCC09K8/5086C09K8/5083C09K2208/08
Inventor 李明黄波张子麟周广清张潦源陈勇由庆王华
Owner CHINA PETROLEUM & CHEM CORP
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