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Method for determining organic chrominum cross-linkage gel system based on low molecular weight high concentration polymer

A technology of cross-linking gel and determining method, which is applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of short stable production time, poor development effect, serious flooding, etc. Long glue time, easy to monitor the effect

Inactive Publication Date: 2011-06-08
武侯区巅峰机电科技研发中心
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Problems solved by technology

Conventional water injection is used to exploit low-permeability fractured reservoirs, resulting in severe water channeling and flooding of oil wells, short production stabilization time, and poor development effects

Method used

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  • Method for determining organic chrominum cross-linkage gel system based on low molecular weight high concentration polymer
  • Method for determining organic chrominum cross-linkage gel system based on low molecular weight high concentration polymer
  • Method for determining organic chrominum cross-linkage gel system based on low molecular weight high concentration polymer

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Embodiment

[0024] The purpose of determining the primary cross-linked gel system is to obtain a suitable composition of the primary cross-linked gel system. Study and analyze the gelation properties (gelation time and gelation viscosity) of the primary crosslinking gel under different polymer types and concentrations as well as different primary crosslinking agents and concentrations, so as to ensure that the profile control agent has been Movable gel with a certain network structure formed in advance can meet the priority of entering large and medium fractures at a certain injection speed, and at the same time prevent the fluid loss of the gel system in the fracture.

[0025] (1) Effect of polymer molecular weight and concentration

[0026] Four different low molecular weight HPAMs were used to investigate the effect of polymer molecular weight and concentration on primary gelling properties. Using organic chromium as the first crosslinking agent, the first polycross ratio is 20:1, the...

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Abstract

The invention provides a method for determining an organic chrominum cross-linkage gel system based on low molecular weight high concentration polymers, comprising steps of: selecting chromium acetate as a primary cross-linking agent; selecting high concentration polymers having a low molecular weight of 4 million as raw materials of profile control agents; For the high concentration polymers having a low molecular weight of 4 million, the concentration is 0.6 to 0.8 percent; the concentration ratio between the high concentration polymers and the first cross-linking agent is 25:1 to 35:1; the intensity of formed gel is 190 to 200mPa.s. The invention has a strong selectivity and is simple in a construction process, moreover the invention can neither bring permanent damage to stratums nor obstruct the performing of later measures.

Description

technical field [0001] The invention relates to the technical field of deep profile control in ultra-low permeability fractured reservoirs, in particular to a method for determining an organic chromium cross-linked gel system based on a low-molecular-weight high-concentration polymer in the profile control technology. Background technique [0002] Many low-permeability reservoirs in my country have well-developed reservoir fractures, forming fractured low-permeability sandstone reservoirs. The geological and development characteristics of this type of reservoir are quite different from those of ordinary low-permeability reservoirs, and its main feature is the prominent anisotropy, and the water flooding conditions in different directions are obviously different. In fractured reservoirs, fractures are the main seepage channels, while matrix or micro-fractures are the main oil storage system. During the water injection development of such reservoirs, since the permeability of ...

Claims

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Application Information

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IPC IPC(8): C09K8/44
Inventor 黄友华
Owner 武侯区巅峰机电科技研发中心
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