Method and device for reducing viscosity of shaft applicable to extremely-viscous oil recovery

A viscosity-reducing and wellbore technology, applied in the fields of fluid production, earth-moving drilling, wellbore/well components, etc., can solve the problems of imperfect process conditions and poor performance of viscosity-reducing agents, saving thin oil rate and reducing production. cost effect

Active Publication Date: 2013-04-10
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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  • Claims
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Problems solved by technology

However, it has not been widely used. In addition to the poor performance of the viscosity redu

Method used

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  • Method and device for reducing viscosity of shaft applicable to extremely-viscous oil recovery

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Embodiment 1

[0034] The present invention is applied to the TH12329 mechanically pumped well of Tahe Oilfield to carry out the field test of viscous reduction of heavy oil. The solution of SDG-2 composite viscosity reducer (publication number CN102604621A) developed by China University of Petroleum (Beijing) is housed in the drug storage tank 1.

[0035] The preparation steps of this viscosity reducer are:

[0036] (1) Preparation of oil-soluble viscosity reducer:

[0037] Mixed aromatics (50% by mass): toluene, ethylbenzene (1:1)

[0038] Alcohols (50% by mass): ethanol, octanol, pentanol (1:1:1);

[0039] Preparation method: Mix the above components at normal temperature and pressure, and stir to obtain.

[0040] (2) Preparation of water-soluble viscosity reducer

[0041] Fatty alcohol ether carboxylate is: CH 3 (CH 2 ) 8 O(CH 2 CH 2 O) 8 CH 2 COONa.

[0042] Preparation:

[0043] Add 0.1mol structural formula to the reactor AEOs 8 , under strong stirring and slight heat...

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Abstract

The invention relates to a method and device for reducing viscosity of a shaft applicable to extremely-viscous oil recovery. The method comprises the steps that mixed liquid of thin oil and viscosity reduction agent is injected to the bottom of an oil well, and the extraction operation of the oil is carried out after the mixed liquid is mixed with the viscous oil. The device comprises an intersected thin oil pipeline (3) and a viscosity reduction agent pipeline which is connected with a medicine storage tank (1) and a measuring pump (2), and the intersected pipelines are sequentially connected with an annular space of a ground mixing device (5) and an oil well bushing (6). Through the simple technique modification, the viscosity reduction agent is used for substituting partial thin oil, so that a good effect can be realized in the recovery process of the extremely-viscous oil, the thin oil can be saved by more than 70 percent, and the recovery cost of the extremely-viscous oil can be greatly reduced.

Description

technical field [0001] The invention relates to the field of ultra-heavy oil emulsification and viscosity-reducing exploitation, and is a technique for reducing the viscosity of a wellbore during the exploitation of deep-layer ultra-high-viscosity crude oil in an oil field. Background technique [0002] my country has abundant heavy oil reserves in ultra-deep wells, but it is difficult to exploit them. At present, many oil recovery processes have been developed at home and abroad, such as steam injection recovery process, viscosity reduction process mixed with thin oil, viscosity reduction process by heating, and emulsification viscosity reduction process mixed with high-efficiency water-soluble viscosity reducer. However, due to regional differences, the techniques used in different oilfield blocks are also different. The production of heavy oil in Tahe Oilfield accounts for about 57% of the total output. At present, the viscosity reduction process of blending thin oil is ...

Claims

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Application Information

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IPC IPC(8): E21B43/22
Inventor 李子甲王雷任波杨祖国吴文明郭继香范胜程仲富李婷婷何晓庆郭娜
Owner CHINA PETROLEUM & CHEM CORP
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