Profile adjusting and water plugging agent and application, profile adjusting and water plugging system and preparation method and application thereof

A profile control water shutoff agent and a profile control water shutoff technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of limited water shutoff profile control effect, reduced water thickening performance, poor long-term stability, etc. , to achieve the effects of reduced environmental sensitivity, long-term stability, improved plugging strength, and low cost

Active Publication Date: 2018-09-28
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the large-scale development of high-temperature and high-salt reservoirs, the effect of conventional gel-based systems on water plugging and profile control is limited.
The polyacrylamide gel system commonly used at present has poor long-term stability because polyacrylamide is easy to degrade at high temperature; under high-salt conditions, due to the salt-sensitive effect, the thickening performance of water is significantly reduced. Under salt conditions, the application range of polyacrylamide gel systems is limited

Method used

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  • Profile adjusting and water plugging agent and application, profile adjusting and water plugging system and preparation method and application thereof
  • Profile adjusting and water plugging agent and application, profile adjusting and water plugging system and preparation method and application thereof
  • Profile adjusting and water plugging agent and application, profile adjusting and water plugging system and preparation method and application thereof

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preparation example Construction

[0083] According to a third aspect of the present invention, the present invention provides a preparation method for the above-mentioned profile control and water shutoff system, comprising the following steps:

[0084] (a) adding the activator and any regulator into the water and mixing uniformly, then adding the inorganic nanoparticles into the water, mixing uniformly to obtain a dispersion solution;

[0085] (b) Add the amphiphilic polymer and the optional oxygen scavenger into the dispersion solution, mix evenly, then add the crosslinking agent, mix evenly, and obtain the profile control and water shutoff system.

[0086] The preparation method of the profile control and water shutoff system provided by the invention has the advantages of simple process, easy-to-obtain raw materials and convenient operation, and has broad application prospects in oil field development.

[0087] In a further preferred embodiment of the present invention, in step (b), the amphiphilic polymer...

Embodiment 1

[0093] This embodiment provides a profile control water shutoff agent, its raw materials include the following raw materials in parts by mass: 0.5g temperature-increasing amphiphilic polymer, 0.5g SiO 2 Particles (50nm in particle size), 0.1g ethylenediaminetetraacetic acid, 0.2g sodium dodecanoate, 0.015g sodium sulfite and 1g phenolic resin crosslinking agent;

[0094]Wherein the molecular structural formula of temperature-increasing amphiphilic polymer is:

[0095]

[0096] a is 60-80, b is 10-20, c is 20-30, n is 1000-1500;

[0097] The weight-average molecular weight of the warm-tackifying amphiphilic polymer is 2×10 6 .

Embodiment 2

[0099] This embodiment provides a profile control water shutoff agent, its raw materials include the following raw materials in parts by mass: 0.2g salt thickening amphiphilic polymer, 1.5g SiO 2 Particles (particle size is 40nm), 0.5g ethylenediaminetetraacetic acid, 1g sodium dodecanoate, 0.005g sodium sulfite and 0.1g organic chromium crosslinking agent;

[0100] Wherein, the structural formula of salt thickening amphiphilic polymer is:

[0101]

[0102] x is 80-200, y is 4-30, z is 1-5;

[0103] The weight-average molecular weight of the salt-adhesive amphiphilic polymer is 3.58×10 6 .

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Abstract

The invention provides a profile adjusting and water plugging agent and application, a profile adjusting and water plugging system and preparation method and an application thereof, and relates to thetechnical field of oilfield development. The profile adjusting and water plugging agent comprises, by weight, the following raw materials: 5-30 parts of inorganic nano-particles, 2-10 parts of amphiphilic polymer, 2-10 parts of activator and 1-10 parts of cross-linking agent; the profile adjusting and water plugging system comprises profile adjusting and water plugging agent and water; the technical problem of limited application range of the existing polyacrylamide gel water plugging system under the condition of high temperature and high salt is relieved, so that the long-term stability andthe plugging strength of the generated water plugging gel are obviously improved, and the environmental sensitivity is obviously reduced, so that the system has a wide application prospect in the development of high-temperature and high-salt oil reservoirs.

Description

technical field [0001] The invention relates to the technical field of oil field development, in particular to a profile control water shutoff agent and its application, a profile control water shutoff system and its preparation method and application. Background technique [0002] Water injection development has become an essential part of the development process of major oilfields in my country, but in the process of water injection development, due to the heterogeneity of the formation, water flooding and water channeling are very easy to occur in the process of water injection development. The use of gel systems to carry out water plugging and profile control has become one of the most commonly used measures in mines. However, with the large-scale development of high-temperature and high-salt reservoirs, the effect of conventional gel-based systems on water plugging and profile control is limited. The polyacrylamide gel system commonly used at present has poor long-term...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512C09K8/508
CPCC09K8/5083C09K8/512C09K2208/10
Inventor 杨红斌康万利曹长霄朱洲唐雪辰郭书鋆侯小雨黄子桐张向峰
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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