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Heterogeneous system for oil displacement or profile control of heterogeneous reservoirs and preparation method for heterogeneous system

A heterogeneous oil reservoir and heterogeneous phase technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., to achieve the effects of reducing oil and water pollution, saving water resources, and enhancing the ability to divert liquid flow

Inactive Publication Date: 2016-03-09
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] What the present invention aims to solve is the deficiency of the single profile control / displacement control system in the prior art, and provides a heterogeneous system for profile control, flood control or profile control of heterogeneous reservoirs and its preparation method. The system consists of a dispersed phase and a continuous phase. The continuous phase is responsible for carrying the dispersed phase and controlling its mobility in the formation. The dispersed phase uses its particles to expand to seal the high-permeability formation, enhance the ability to divert liquid flow, and better play profile control and oil displacement The continuous phase increases the fluidity and suspension of the system, and the dispersed phase enhances the plugging and liquid flow diversion capabilities of the system. The sum of the two increases the system effect; the system can directly use oilfield reinjection water for liquid preparation, which can Save water resources, reduce environmental pollution of oilfield produced water, and easy to dissolve, simple construction; can be used for profile control / regulation and flooding of water injection wells in oilfield medium and high water cut periods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Accurately weigh (0.8 / 0.9174) g of partially hydrolyzed polyacrylamide polymer (relative molecular mass: 1400×10 4 , solid content: 91.74%, degree of hydrolysis: 27%) was added into 1L oilfield injection water to form a continuous phase solution with a mass percentage of 0.08%. Add the dispersed phase of expandable pre-crosslinked gel polymer particles (particle size: 5-30 μm, solid content: 86%) according to the mass ratio of the continuous phase and the dispersed phase of 3:1, stir and mix to make it fully swell and uniform to obtain Heterogeneous phase modulation and flooding system 1. Using three-layer heterogeneous cores to carry out physical simulation experiments, record the displacement pressure difference and calculate its recovery degree. Simulation results: the total recovery rate reaches 47.5%, and the recovery degree is increased by 9.5% relative to water flooding; at the same time, during the injection process of heterogeneous system, the injection pressu...

Embodiment 2

[0037] Accurately weigh (1.5 / 0.9174) g of partially hydrolyzed polyacrylamide polymer (relative molecular mass: 1400×10 4 , solid content: 91.74%, degree of hydrolysis: 27%) was added into 1L oilfield injection water to form a continuous phase solution with a mass percentage of 0.15%. Add the dispersed phase of expandable pre-crosslinked gel polymer particles (particle size: 30-100 μm, solid content: 86%) according to the mass ratio of the continuous phase and the dispersed phase at 5:1, stir and mix to make it fully swell and uniform to obtain Heterogeneous phase modulation and flooding system II. Using three-layer heterogeneous cores to carry out physical simulation experiments, record the displacement pressure difference and calculate its recovery degree. Simulation results: the total recovery rate reaches 52.1%, and the recovery degree is increased by 14.1% relative to water flooding; at the same time, during the injection process of the heterogeneous system, the injection ...

Embodiment 3

[0039] Accurately weigh (2 / 0.9174) g of the relative molecular mass partially hydrolyzed polyacrylamide polymer (relative molecular mass: 1400×10 4 , solid content: 91.74%, degree of hydrolysis: 27%) was added into 1L oil field injection water to form a continuous phase solution with a mass percentage of 0.2%. Add the dispersed phase of expandable pre-crosslinked gel polymer particles (particle size: 100-300 μm, solid content: 86%) according to the mass ratio of the continuous phase and the dispersed phase of 10:1, stir and mix to make it fully swell and uniform to obtain Heterogeneous phase modulation and flooding system III. Using three-layer heterogeneous cores to carry out physical simulation experiments, record the displacement pressure difference and calculate its recovery degree. Simulation results: The total recovery rate reaches 55.5%, and the recovery degree is increased by 17.5% relative to water flooding. At the same time, during the injection process of heterogen...

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Abstract

The invention relates to heterogeneous systems for profile control / oil displacement of oilfield injection wells and discloses a heterogeneous system for oil displacement or profile control of heterogeneous reservoirs and a preparation method for the heterogeneous system. The heterogeneous system consists of a continuous phase and a disperse phase, wherein the continuous phase is an aqueous solution of partially hydrolyzed polyacrylamide, an aqueous solution of a partially hydrolyzed polyacrylamide emulsion or a flow gel system prepared from partially hydrolyzed polyacrylamide; and the disperse phase is expandable pre-crosslinked gel polymer particles. According to the heterogeneous system, the continuous phase is responsible for carrying the disperse phase and carrying out mobility control in strata, and the disperse phase blocks high-permeability strata through the expansion of the particles, so that the fluid diversion capability is strengthened, and the profile control oil displacement effect is better exerted; according to the system, the solution can be prepared by directly adopting oilfield reinjection water, so that water resources can be conserved, and the environmental pollution caused by oilfield produced water is reduced; the dissolving is convenient, and the construction is simple; and the system can be applied to the profile control / oil displacement of the oilfield injection wells at a high-water-cut stage.

Description

technical field [0001] The invention belongs to the field of petroleum exploitation, and in particular relates to a heterogeneous system for profile control / displacement control of water injection wells in oil fields and a preparation method thereof. Background technique [0002] Various production stimulation and tertiary oil recovery technologies such as profile control / modulation and flooding can restrain the trend of excessively rapid rise of comprehensive water cut in oilfields. At present, the commonly used profile control / displacement control systems in oilfields mainly include polymers, jelly systems, microspheres, etc. Each system has its own advantages and corresponding shortcomings, and the effects of mine implementation are not the same. [0003] The jelly system is a high-strength polymer network structure formed by high molecular polymers and cross-linking agents, which has good stability. It is formed by polymers, cross-linking agents, auxiliary agents, etc. i...

Claims

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Application Information

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IPC IPC(8): C09K8/512C09K8/588
CPCC09K8/512C09K8/5083C09K8/588
Inventor 王成胜翁大丽吴晓燕张润芳陈士佳刘全刚易飞朱洪庆王宏申吕鹏张宁左清泉
Owner CHINA NAT OFFSHORE OIL CORP
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