Bottom water plugging agent system and process for horizontal well

A horizontal well and system technology, applied in the direction of sealing/isolation, wellbore/well components, drilling composition, etc., can solve the problems of lack of mature technology, etc., achieve reasonable selection, increase oil well productivity, and strong erosion resistance Effect

Inactive Publication Date: 2013-01-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most horizontal wells in China have entered the high water-cut development period. Unlike conventional vertical wells, due to the special well structure, completion method, and water discharge type of horizontal wells, the water plugging work of horizontal wells at home and abroad is still not mature. technology

Method used

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  • Bottom water plugging agent system and process for horizontal well
  • Bottom water plugging agent system and process for horizontal well
  • Bottom water plugging agent system and process for horizontal well

Examples

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preparation example Construction

[0058] The preparation method of the inorganic precipitation type system comprises the following steps:

[0059] (1) Put the oil field injection water into the mixing tank first, turn on the mixer in the tank, and the stirring speed is 100-200rpm;

[0060] (2) Add the inorganic precipitation system and slowly pour it in along the vortex stirred in (1);

[0061] (3) After stirring for 30 minutes, reduce the stirring speed to 50-80 rpm, continue stirring for 50 minutes, then stop stirring to obtain an inorganic precipitation type system, and the concentration of the prepared system is 5-35 wt%.

[0062] The preparation method of described polysilicon system or polymer jelly system comprises the following steps:

[0063] (1) Put the oil field injection water into the mixing tank first, turn on the mixer in the tank, and the stirring speed is 1000-2000rpm;

[0064] (2) Add polysilicon system or polymer jelly system and slowly pour in along the vortex stirred in (1);

[0065] (3...

Embodiment 1

[0076] Example 1: Conventional Horizontal Bottomhole Water Plugging Technology of Inorganic Precipitation System and Polymer Jelly System

[0077] A horizontal well bottom water plugging technology mainly includes two slugs, the first slug is an inorganic precipitation system and the second slug is a polymer jelly system with a volume ratio of 1:3.

[0078] The above-mentioned horizontal bottom hole water plugging technology includes the following steps:

[0079] (1) First put a certain amount of oilfield injection water into the mixing tank of the inorganic precipitation system, turn on the mixer in the tank, and the stirring speed is 100-200rpm;

[0080] (2) Add a certain amount of inorganic precipitation system and pour it slowly along the vortex stirred in (1);

[0081] (3) After stirring for 30 minutes, the stirring speed is reduced to 50-80 rpm, and the stirring is stopped after 50 minutes of continuous stirring to obtain a 5-35 wt% inorganic precipitation system;

[0...

Embodiment 2

[0087] Example 2: Conventional Horizontal Bottomhole Water Plugging Technology of Inorganic Precipitation System and Polysilicon System

[0088] A horizontal well bottom water plugging technology mainly includes two slugs, the volume ratio of the first slug inorganic precipitation system and the second slug polysilicon system is 2:1.

[0089] The above-mentioned horizontal bottom hole water plugging technology includes the following steps:

[0090] (1) First put a certain amount of oilfield injection water into the mixing tank of the inorganic precipitation system, turn on the mixer in the tank, and the stirring speed is 100-200rpm;

[0091] (2) Add a certain amount of inorganic precipitation system and pour it slowly along the vortex stirred in (1);

[0092] (3) After stirring for 30 minutes, the stirring speed is reduced to 50-80 rpm, and the stirring is stopped after 50 minutes of continuous stirring to obtain a 5-35 wt% inorganic precipitation system;

[0093] (4) Put a ...

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Abstract

The invention discloses a bottom water plugging agent system and process for a horizontal well. The bottom water plugging agent system for the conventional horizontal well is characterized by comprising an inorganic precipitation type system and a polysilicon system or polymer gel system.The bottom water plugging agent system for the thermal-recovery horizontal well is characterized by comprising an inorganic precipitation type system and a N2 foam system or temperature-sensitive gel system. The bottom water plugging agent process for the horizontal well comprise the following steps: (1) injecting an annular chemical plugging device by using a mechanical packer plugging device on the basis of clarifying a water outlet point so as to ensure the selectivity of the injection; (2) selecting the bottom water plugging agent system according to the temperature, the heterogeneity and other parameters of the oil reservoir at the horizontal well; and (3) injecting the bottom water plugging agent system. The bottom water plugging agent system is selected reasonably and combined properly. The technology of the bottom water plugging agent process can be applied to the horizontal well with high or ultrahigh water content to achieve the purpose of deeply plugging more than 90% of bottom water at high strength, so that the water content of the horizontal well is reduced effectively, and the productivity of the oil well is improved.

Description

technical field [0001] The invention relates to a horizontal well bottom water plugging agent system and a bottom water plugging process. Background technique [0002] Horizontal wells increase the length of the wellbore in the production layer and the drainage area of ​​the production layer, which can develop reservoirs under low pressure difference, increase the rate of reservoir and fracture drilling, and effectively solve various problems in the process of oil and gas field development. At present, most horizontal wells in China have entered the high water-cut development period. Unlike conventional vertical wells, due to the special well structure, completion method, and water discharge type of horizontal wells, the water plugging work of horizontal wells at home and abroad is still not mature. technology. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a horizontal well bottom water plugging agent system a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/42E21B33/13
Inventor 刘承杰刘巍宋岱锋薄纯辉吕西辉田玉芹陈伟张光焰张代森曹嫣镔
Owner CHINA PETROLEUM & CHEM CORP
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