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Fracture-hole type water-driven flexible flow regulating particle and preparation method thereof

A water-flooding flexible, fracture-cavity technology, applied in chemical instruments and methods, drilling compositions, etc., to achieve the effects of low cost, adjustable strength, and long stability period

Inactive Publication Date: 2018-09-18
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to overcome the defects of the prior art, the present invention provides a fractured-cavity water flooding with low cost, good performance, long stable period and adjustable strength, which can solve the problem of water channeling in the weathered crust reservoir on the surface of fractured-cavity reservoirs. Flexible flow regulating particles and preparation method thereof

Method used

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  • Fracture-hole type water-driven flexible flow regulating particle and preparation method thereof

Examples

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preparation example Construction

[0039] According to another aspect of the present invention, the present invention provides a method for preparing fracture-cavity water-flooding flexible flow-regulating particles, comprising the following steps:

[0040] (1) After stirring the clear water and the clay evenly, add N-vinylpyrrolidone and acrylamide, stir evenly, and let stand;

[0041] In a preferred embodiment, step (1) is: add clay solution and clear water into the mixing tank, stir until the solution is dispersed and stable, then add N-vinylpyrrolidone and acrylamide and stir evenly, and leave the above solution for 3 Hour;

[0042] The above solution was left to stand for 3 hours in order to better gel.

[0043] The salinity of the above-mentioned clear water is lower than 1000 mg / L, and the clear water can be tap water.

[0044] (2) Add N, N-dimethylene bisacrylamide solution, after stirring evenly, add sodium formaldehyde sulfoxylate and ammonium persulfate solution;

[0045] Wherein, N, N-dimethylene...

Embodiment 1

[0054] Add 4 parts by weight of sodium bentonite in clear water and stir evenly, then add 20 parts by weight of N-vinylpyrrolidone and 40 parts by weight of acrylamide and stir evenly, let stand; add 0.5 parts by weight of N,N-di After stirring the solution of methylenebisacrylamide evenly, a solution containing 0.5 parts by weight of sodium formaldehyde sulfoxylate and 0.3 parts by weight of ammonium persulfate was added to the mixture, stirred; nitrogen gas was introduced for 35 minutes, and heated to After 3 hours at 50°C, it was sheared by a colloid mill to obtain fracture-cavity water flooding flexible flow-regulating particles with a particle size of 2-5 mm, wherein the total content of clean water used was 34.7 parts by weight.

Embodiment 2-7

[0056] The fracture-cavity water flooding flexible flow-regulating particles were prepared according to the same steps as in Example 1, and the technical parameters of each example are shown in the table below.

[0057] Summary of technical parameters of Table 1 Embodiment 2-7

[0058]

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Abstract

The invention relates to the technical field of oil and gas field development, and in particular relates to a fracture-cavity type water-driven flexible flow regulating particle and a preparation method thereof, wherein the fracture-cavity type water-driven flexible flow regulating particle comprises 10%-40% by weight of N-vinylpyrrolidone, 20%-50% by weight of acrylamide, 0.1%-1% by weight of N,N'-methylene bisacrylamide, 0.1%-1% by weight of sodium formaldehyde sulfoxylate, 0.1%-0.5% by weight of ammonium persulfate, 1%-5% of clay and the balance of water. The fracture-cavity type water-driven flexible flow regulating particle has the advantages of low cost, good performance, long stable period and adjustable strength, and can effectively solve and control the water channeling problem of a surface weathering shell reservoir of a fracture-cavity type reservoir.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a fracture-cavity water drive flexible flow regulating particle and a preparation method thereof. Background technique [0002] The limestone reservoir spaces of the Middle-Lower Ordovician Yingshan Formation in Block 4 of Tahe Oilfield are mainly dissolved caves, dissolved pores and fractures, and the storage and seepage spaces are diverse in shape, large in size, uneven in distribution, and extremely heterogeneous . The thickness of the cave reservoir is 454.52m; the average cave height is 10m. Dissolution pores are widely distributed in isolated and dispersed forms in carbonate reservoirs. The main types of effective fractures in Tahe District 4 are late structural fractures and dissolution fractures, which are secondary oil and gas storage spaces in the area. Fractures make little contribution to oil and gas accumulation, but play a certain role in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512C09K8/516C09K8/588
CPCC09K8/5083C09K8/512C09K8/516C09K8/588C09K2208/18
Inventor 王雷钱真焦保雷李子甲杨祖国吴文明常公喜甄恩龙马剡王磊磊杨映达
Owner CHINA PETROLEUM & CHEM CORP
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