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A thermal recovery sealing agent for heavy oil

A technology for thermal recovery of heavy oil and sealing channeling agent, which is applied in the directions of drilling compositions, chemical instruments and methods, etc., can solve the problem that the high-temperature steam of 200-300°C cannot be tolerated, and the suspended particle type sealing and channeling agent cannot be injected in large doses. , the problem of poor sealing effect of steam channeling channels, etc., to save the cost of measures, improve the sealing effect, and achieve good sealing effect.

Active Publication Date: 2012-02-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. It can only be used in steam channeling wells without sand control measures, and cannot be used in steam channeling wells after sand control measures are taken, because there are sand control layers or sand control tools in the sand control wells, and the particle size of the granular sealing agent makes it impossible to penetrate Pass through the sand control layer or sand control tools into the steam channel to block the steam channeling
[0005] 2. The squeeze injection pressure is high during construction, and the suspended particle sealing agent cannot be injected into the deep part of the formation in large doses, and the sealing effect on the deep part of the formation is poor.
[0006] Chinese patent application number: 200410029654.3 discloses a solution-type plugging agent, which is mainly used for profile control and water plugging of oil wells. Although the plugging agent can enter deep formations through sand control layers or sand control tools, it cannot withstand 200-300 ℃ high-temperature steam, so it cannot be applied in thermal recovery of heavy oil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The solution blocking channeling agent of the present embodiment is to be made from the raw material of following percentage by weight: water glass 10%, ethyl acetate 3%, ammonium chloride 1%, aluminum citrate 0.005%, EDTA 0.02%, surplus is water . Among them, the modulus of water glass is 2.8 and the specific gravity is 1.37.

[0017] The test of the blocking agent of the present embodiment in the oil well is as follows:

[0018] A certain well is an oil production well. The well produced 5 cycles of oil production, accumulative steam injection of 6345.2 tons, cumulative oil production of 3254 tons, average cycle steam injection of 1269 tons, periodic oil production of 650.8 tons, and oil-gas ratio of 0.51. Because steam channeling occurs between this well and other oil wells and water injection wells, the channeling measures are implemented, and 30 cubic meters of particle type channeling agent and 120 cubic meters of channeling agent of this embodiment are injected ...

Embodiment 2

[0020] The solution blocking channeling agent of the present embodiment is to be made from the raw material of following percentage by weight: water glass 20%, ethyl acetate 2%, ammonium chloride 0.8%, aluminum citrate 0.01%, EDTA disodium salt 0.01%, balance for water. Among them, the modulus of water glass is 3.2 and the specific gravity is 1.35.

[0021] The test of the blocking agent of the present embodiment in the oil well is as follows:

[0022] A certain well is a heavy oil thermal recovery well. The well has been produced for 3 cycles, accumulatively injecting 1775 tons of steam, and accumulatively producing only 25.9 tons of oil. In the third cycle, injecting 541 tons of steam, producing 11.1 tons of oil, with an oil-gas ratio of 0.021. Because this well and other two oil wells have serious steam channeling, measures for sealing channeling were implemented, and 160 cubic meters of channeling sealing agent of the present embodiment were injected, and then waited for ...

Embodiment 3

[0024] The solution blocking agent of the present embodiment is to be made from the raw material of following percentage by weight: water glass 15%, ethyl acetate 1%, ammonium chloride 0.3%, aluminum citrate 0.015%, EDTA disodium salt 0.02%, balance for water. Among them, the modulus of water glass is 3.2 and the specific gravity is 1.35.

[0025] The test of the blocking agent of the present embodiment in the oil well is as follows:

[0026] A certain well is a heavy oil thermal recovery well, and sand control measures are taken by hanging filter for sand removal. After sand control, the well had serious steam channeling with two adjacent oil wells. Due to the presence of metal felt for hanging filters, no granular sealing channeling agent was used. To implement sealing channeling measures, under the premise of not moving the metal felt, 132 cubic meters of channeling sealing agent of the present embodiment were injected, and then waited for 24 hours. After the implementat...

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Abstract

The invention discloses a sealing agent for thermal recovery of heavy oil, which is made of the following raw materials in percentage by weight: 10-30% of water glass, 0.5-3% of ethyl acetate, 0.3-1.3% of ammonium chloride, and 0.005% of aluminum citrate -0.015%, EDTA or EDTA salt 0.01-0.03%, the balance is water. The gelation time of the sealing agent of the present invention is 4-12 hours. After gelling, it can withstand high-temperature steam at 300°C. It can be used in conjunction with the suspended particle type sealing agent, and is used for the implementation of some thermal recovery wells with serious steam channeling. Deep channel sealing can enhance the channel sealing effect; especially it can be used in heavy oil thermal recovery sand control wells, which can directly seal channel in the presence of sand control layers or sand control tools, reducing construction costs and having good results.

Description

technical field [0001] The invention relates to a sealing agent for heavy oil thermal recovery, which belongs to the technical field of petroleum exploitation. Background technique [0002] Heavy oil is a kind of oil with high viscosity and poor fluidity, which is difficult to extract, and the viscosity needs to be reduced to facilitate extraction. Thermal recovery of heavy oil is the main technical means of heavy oil development. Heavy oil thermal recovery technologies mainly include steam huff and puff, steam flooding, cluster directional wells and horizontal wells, burning oil layers and other supporting technologies for heavy oil thermal recovery. Steam huff and puff recovery of heavy oil is a relatively simple and mature steam injection recovery technology. It is still widely used in Venezuela, the United States and Canada. There are also quite a few heavy oil reservoirs in my country's oilfields, such as Shengli, Henan, Liaohe, and Karamay. The method of extraction (he...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/46
Inventor 路群祥张文玉王晓东潘忠贾丽云
Owner CHINA PETROLEUM & CHEM CORP
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