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High-temperature plugging agent system used for heavy-oil thermal recovery oil reservoir

A technology of thermal oil recovery and high temperature, which is applied in the field of plugging agents, can solve the problems that polyacrylamide gel is not suitable for plugging steam channeling, etc., and achieve the goal of improving the plugging performance of plugging agents, excellent temperature resistance, and less formation damage Effect

Active Publication Date: 2018-09-14
NORTHEAST GASOLINEEUM UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] An object of the present invention is to provide a high-temperature plugging agent system for heavy oil thermal recovery reservoirs, this kind of high-temperature plugging agent system for heavy oil thermal recovery reservoirs is used to solve the problem of polyacrylamide in the prior art Gels are not suitable for blocking steam channeling problems

Method used

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  • High-temperature plugging agent system used for heavy-oil thermal recovery oil reservoir
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  • High-temperature plugging agent system used for heavy-oil thermal recovery oil reservoir

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Embodiment 1

[0034] The solvent used in this high-temperature plugging agent system for heavy oil thermal recovery oil reservoirs is distilled water. A certain mass of polymer powder is stirred and dissolved in a certain amount of water to fully dissolve, and then the cross-linking agent, stabilizer, buffer, chelating agent, and Slowly add the mixture and free radical scavenger into the polymer-containing aqueous solution, and pay attention to rapid stirring when adding solid phase particles. Then the solution was stirred for 2 hours to ensure uniform mixing, and fully stirred and dissolved to obtain a high-temperature plugging agent system for heavy oil thermal recovery reservoirs. The composition of this embodiment is shown in Table 1.

[0035] Table 1

[0036] name

[0037] Scanning electron microscope was used to observe its microscopic morphology. figure 1 The local structure diagram of the high-temperature blocking agent system in Example 1 can be seen, and the prepared ...

Embodiment 2

[0039] The solvent used in this high-temperature plugging agent system for heavy oil thermal recovery oil reservoirs is distilled water. A certain mass of polymer powder is stirred and dissolved in a certain amount of water to fully dissolve, and then the cross-linking agent, stabilizer, buffer, chelating agent, and Slowly add the mixture and free radical scavenger into the polymer-containing aqueous solution, and pay attention to rapid stirring when adding solid phase particles. Then the solution was stirred for 2 hours to ensure uniform mixing, and fully stirred and dissolved to obtain a high-temperature plugging agent system for heavy oil thermal recovery reservoirs. The composition of this embodiment is shown in Table 2.

[0040] Table 2

[0041] name

Embodiment 3

[0043] The solvent used in this high-temperature plugging agent system for heavy oil thermal recovery oil reservoirs is distilled water. A certain mass of polymer powder is stirred and dissolved in a certain amount of water to fully dissolve, and then the cross-linking agent, stabilizer, buffer, chelating agent, and Slowly add the mixture and free radical scavenger into the polymer-containing aqueous solution, and pay attention to rapid stirring when adding solid phase particles. Then the solution was stirred for 2 hours to ensure uniform mixing, and fully stirred and dissolved to obtain a high-temperature plugging agent system for heavy oil thermal recovery reservoirs. The composition of this embodiment is shown in Table 3.

[0044] table 3

[0045] name

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Abstract

The invention relates to a high-temperature plugging agent system used for a heavy-oil thermal recovery oil reservoir. The high-temperature plugging agent system used for the heavy-oil thermal recovery oil reservoir is prepared by the following steps: stirring a main agent in water for full dissolution, slowly adding a cross-linking agent, a stabilizer, a buffering agent, a chelating agent and a free radical scavenger into an aqueous solution containing a polymer, continuing adding solid phase particles, and performing rapid stirring until the system is uniformly mixed and the particles are fully dissolved to obtain the mixed system; and the plugging agent system comprises the following components in percentages by mass: 0.05-5% of the main agent, 0.05-5% of the cross-linking agent, 0.005-0.05% of the stabilizer, 0.01-5% of the buffering agent, 0.01-1% of the chelating agent, 0.01-1% of the free radical scavenger, 1-10% of the solid phase particles and the balance of water, wherein thesolid phase particles build a bridge in the pore throat position of pores of a formation, and permeability of the pores of the formation is decreased by 50%-80%. The system disclosed by the inventioncan resist temperature of 300 DEG C and has good thermal stability; and the system disclosed by the invention has the temperature resistance superior to that of a traditional high-temperature plugging agent.

Description

technical field [0001] The invention relates to a plugging agent used in the exploitation process of heavy oil reservoirs, in particular to a high-temperature plugging agent system used in heavy oil thermal recovery reservoirs. Background technique [0002] Steam huff and puff and steam flooding are important components of thermal oil recovery, and have been widely used in the development of heavy oil reservoirs. However, due to the influence of formation structure, reservoir heterogeneity, unfavorable oil-steam mobility ratio and steam overlay, these two technologies still face outstanding problems in the field application process, such as the absorption of oil-producing layers. Uneven steam profile, steam channeling, serious fingering phenomena, etc. All these problems will lead to the reduction of volumetric sweep efficiency, which greatly affects the recovery effect of heavy oil steam injection. So, how to solve these problems and improve the oil recovery factor in the...

Claims

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Application Information

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IPC IPC(8): C09K8/592C09K8/512
CPCC09K8/512C09K8/592
Inventor 赵法军刘永建田哲熙吴艳平张宇飞李凯欣
Owner NORTHEAST GASOLINEEUM UNIV
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