Polymer microsphere water shutoff profile control agent and preparation method thereof

The technology of a water profile control agent and polymer is applied in the field of polymer microsphere water plugging profile control agent and its preparation, which can solve the problems of affecting the oil recovery rate, poor stability of the profile control agent, poor plugging effect, etc. Excellent plugging effect, improved stability, not easy to deform

Active Publication Date: 2020-06-05
ZHENGZHOU INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above two profile control agents have poor stability, especially under the condition of high salinity, the stability time is short, easy to deform in actual operation, produce precipitation, poor plugging effect, and affect the recovery of crude oil

Method used

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  • Polymer microsphere water shutoff profile control agent and preparation method thereof
  • Polymer microsphere water shutoff profile control agent and preparation method thereof
  • Polymer microsphere water shutoff profile control agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] This example provides a polymer microsphere water plugging profile control agent, the parts by weight of each component are shown in Table 1, wherein the main agent is: 25 parts of acrylamide, 12 parts of isooctyl acrylate, and 10 parts of N-vinylpyrrolidone parts; additives are: 3 parts of surfactant, 8 parts of bentonite, 2 parts of calcium carbonate. The surfactant is a mixture of alkyl dimethyl betaine and fatty acid sorbitan; the weight ratio of alkyl dimethyl betaine: fatty acid sorbitan is 1:0.3. The crosslinking agent is crosslinking agent JL-1. The dispersion stabilizer is acryloyloxyethyltrimethylammonium chloride. The initiator is azobisisobutylamidine hydrochloride.

Embodiment 2

[0040] This example provides a polymer microsphere water plugging profile control agent, see Table 1 for the parts by weight of each component, wherein the main agent is: 26 parts of acrylamide, 13 parts of isooctyl acrylate, and 11 parts of N-vinylpyrrolidone parts; additives are: 3.5 parts of surfactant, 10 parts of bentonite, 2.2 parts of calcium carbonate. The surfactant is a mixture of alkyl dimethyl betaine and fatty acid sorbitan; the weight ratio of alkyl dimethyl betaine: fatty acid sorbitan is 1:0.3. The crosslinking agent is crosslinking agent JL-1. The dispersion stabilizer is acryloyloxyethyltrimethylammonium chloride. The initiator is ammonium persulfate.

Embodiment 3

[0042] This example provides a polymer microsphere water plugging profile control agent, the parts by weight of each component are shown in Table 1, wherein the main agent is: 27 parts of acrylamide, 14 parts of isooctyl acrylate, and 12 parts of N-vinylpyrrolidone parts; additives are: 3.8 parts of surfactant, 11 parts of bentonite, 2.5 parts of calcium carbonate. The surfactant is a mixture of alkyl dimethyl betaine and fatty acid sorbitan; the weight ratio of alkyl dimethyl betaine: fatty acid sorbitan is 1:0.4. The crosslinking agent is crosslinking agent JL-1. The dispersion stabilizer is acryloyloxyethyltrimethylammonium chloride. The initiator is ammonium persulfate.

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Abstract

The invention discloses a polymer microsphere water shutoff profile control agent and a preparation method thereof, and belongs to the technical field of oil exploitation. The polymer microsphere water shutoff profile control agent is prepared from the following components: a main agent, a dispersion stabilizer, a cross-linking agent, an initiator, an auxiliary agent and water. The polymer microsphere water shutoff profile control agent has good expansibility, the expansion multiple increases quickly in the first 7 days, the expansion multiple increases slowly after 14 days, and the expansionmultiple of the microsphere is higher and reaches 120 times at most along with temperature rise. In formation water with the temperature of 90 DEG C and the mineralization degree of 20 g/L, the microsphere stabilizing time reaches 6 months or above, and the plugging rate reaches 98.7% or above. The expanded particles have certain elasticity, strength and water retention function, can stay in stratum gaps for a long time to achieve the purposes of profile control and water plugging, can enter the deep part of an oil layer under a certain pressure condition to form effective plugging, and can improve the crude oil recovery rate by 35-42%.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a polymer microsphere water plugging profile control agent and a preparation method thereof. Background technique [0002] As an extremely important non-renewable resource in the natural environment, petroleum plays an irreplaceable role in the economic development of the entire country. As the main energy and raw material of chemical industry in today's society, its proportion in the energy consumption structure is increasing day by day, but the ensuing problem of sharply decreasing reserves has become a bottleneck restricting social development. Therefore, how to improve the recovery rate of crude oil in the formation and make full use of the existing oil resources that can be exploited by humans has become an inevitable problem faced by the whole society. In the process of oilfield development, when the original energy of the oil layer begins to decrease, it is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/516C09K8/512C09K8/508
CPCC09K8/516C09K8/5083C09K8/512
Inventor 王少鹏
Owner ZHENGZHOU INST OF TECH
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