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Compounded type cationic polyacrylamide profile control agent and preparation method thereof

A polyacrylamide, cationic technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as short validity period, increase rock viscosity, improve the performance of profile control agent, and increase the viscosity of rock and rock. force effect

Inactive Publication Date: 2015-04-01
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] The short validity period is one of the main problems in the field application of the current profile control system. It is necessary to develop a profile control agent that can extend the validity period.

Method used

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  • Compounded type cationic polyacrylamide profile control agent and preparation method thereof
  • Compounded type cationic polyacrylamide profile control agent and preparation method thereof
  • Compounded type cationic polyacrylamide profile control agent and preparation method thereof

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Embodiment Construction

[0023] Embodiments of the present invention are described in further detail below:

[0024] A compound cationic polyacrylamide profile control agent, by mass fraction, comprising 0.2-0.8% compound cationic polyacrylamide and 0.5-0.7% phenol-formaldehyde resin, and the rest is water; wherein, by mass fraction In total, the composite cationic polyacrylamide includes 3-12% cationic polyacrylamide with a molecular weight of 5-15 million and 88-97% non-ionic polyacrylamide with a molecular weight of 8-12 million.

[0025] Preferably, the composite cationic polyacrylamide includes 8-12% cationic polyacrylamide with a molecular weight of 5-15 million and 88-92% non-ionic polyacrylamide with a molecular weight of 8-12 million in terms of mass fraction.

[0026] Preferably, the composite cationic polyacrylamide includes 8% cationic polyacrylamide with a molecular weight of 5-15 million and 92% non-ionic polyacrylamide with a molecular weight of 8-12 million in terms of mass fraction. ...

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Abstract

The invention discloses a compounded type cationic polyacrylamide profile control agent which comprises the following components in percentage by mass: 0.2-0.8% of compounded type cationic polyacrylamide, 0.5-0.7% of a phenolic aldehyde cross-linking agent, and the balance of water, wherein the compounded type cationic polyacrylamide comprises the following components in percentage by mass: 3-12% of cationic polyacrylamide with the molecular weight of 5000-15,000,000, and 88-97% of nonionic polyacrylamide with the molecular weight of 8000-12,000,000. According to the profile control agent disclosed by the invention, cationic polyacrylamide is adopted as a polymer, and due to attraction of the positive charges of cationic polyacrylamide and the negative charges of reservoir stratum rock, the viscous force of the profile control agent with rock is improved, the plugging strength is improved, and the effective period of profile control is prolonged.

Description

technical field [0001] The invention relates to a profile control agent, in particular to a composite cationic polyacrylamide profile control agent and a preparation method thereof. Background technique [0002] The Triassic in Changqing Oilfield is a typical "three-low" reservoir with low permeability, low pressure and low abundance. At present, the main strata of the Triassic reservoir have entered a period of rapid water cut rise, and some blocks and well groups have entered Medium to high water content period. One of the important reasons is that the injected water of water injection wells rushes along natural fractures and high-permeability pore seepage zones of reservoirs. Profile control of water injection wells has become the main production stabilization technology in oilfields. [0003] The short effective period is one of the main problems in the field application of the currently applied profile control system. It is necessary to develop a profile control agent ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512
CPCC09K8/512C08L33/26
Inventor 沈一丁谭俊领王磊赖小娟王新亮
Owner SHAANXI UNIV OF SCI & TECH
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