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Horizontal well water shutoff agent formula and using method thereof

A technology for horizontal wells and water plugging agents, which can be used in chemical instruments and methods, earth-moving drilling and production, wellbore/well components, etc., can solve problems such as oil layer damage, and achieve the effects of high plugging strength, safe construction and long validity period

Inactive Publication Date: 2016-03-02
黄志华 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since there is no completely selective water shutoff agent, water shutoff in horizontal wells with this construction method may cause serious reservoir damage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A horizontal well water shutoff agent formula, including main components and chemical activator components:

[0030] The main component includes raw materials in the following weight ratio: 4 parts of blast furnace slag fine powder, 6 parts of bentonite, and 90 parts of water;

[0031] The chemical activator component includes raw materials in the following weight proportions: 3 parts of sodium hydroxide and 97 parts of water.

[0032] The preparation method of the above horizontal well water blocking agent formula is as follows: mixing and stirring the raw materials of the main component to obtain the main component; mixing and stirring the raw materials of the chemical activator to obtain the chemical activator.

[0033] The method of using the above horizontal well water shutoff agent formula is as follows:

[0034] (1) Connect the wellhead tubing, first packer, constant pressure valve, second packer and bottom ball seat together in sequence;

[0035] (2) The main ...

Embodiment 2

[0039] A horizontal well water shutoff agent formula, including main components and chemical activator components:

[0040] The main component includes raw materials in the following weight ratio: 15 parts of blast furnace slag fine powder, 10 parts of bentonite, and 75 parts of water;

[0041] The chemical activator component includes raw materials in the following weight proportions: 5 parts of sodium hydroxide and 95 parts of water.

[0042] The preparation method of the above horizontal well water blocking agent formula is as follows: mixing and stirring the raw materials of the main component to obtain the main component; mixing and stirring the raw materials of the chemical activator to obtain the chemical activator.

[0043] The method of using the above horizontal well water shutoff agent formula is as follows:

[0044] (1) Connect the wellhead tubing, first packer, constant pressure valve, second packer and bottom ball seat together in sequence;

[0045] (2) Inject ...

Embodiment 3

[0049] A horizontal well water shutoff agent formula, including main components and chemical activator components:

[0050] The main component includes raw materials in the following weight proportions: 8 parts of blast furnace slag micropowder, 4 parts of bentonite, 3 parts of calcium carbonate micropowder, 0.05 part of xanthan gum, and 85 parts of water;

[0051] The chemical activator component includes raw materials in the following weight proportions: 7 parts of sodium hydroxide and 93 parts of water.

[0052] The preparation method of the above horizontal well water blocking agent formula is as follows: mixing and stirring the raw materials of the main component to obtain the main component; mixing and stirring the raw materials of the chemical activator to obtain the chemical activator.

[0053] The method of using the above horizontal well water shutoff agent formula is as follows:

[0054] (1) Connect the wellhead tubing, first packer, constant pressure valve, second...

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Abstract

The invention relates to a horizontal well water shutoff agent formula and a using method thereof. The horizontal well water shutoff agent comprises a main component and a chemical activating agent component. The main component is prepared from, by weight, 4-15 parts of blast furnace slag powder, 3-10 parts of bentonite, 0-10 parts of calcium carbonate powder or vermiculite powder and 75-93 parts of water. The chemical activating agent component is prepared from 3-15 parts of strong base and 85-97 parts of water. The horizontal well water shutoff agent formula has the advantages of resisting temperature and salt, being high in shutoff strength and long in water shutoff validity period and the like, and the main technical problems that a gel type water shutoff agent cannot achieve shutoff or is short in water shutoff validity period, however, a particle cementation and solidification type water shutoff agent is large in shutoff strength and unsafe in construction are solved. According to the using method of the horizontal well water shutoff agent formula, a mechanical packer is used in an assisted mode, a two-stage separation injection construction method is adopted, and therefore construction risks such as tubular column clamping and flagpole inserting are avoided.

Description

technical field [0001] The invention relates to the technical field of oilfield chemistry, in particular to a formulation of a water shutoff agent for horizontal wells and a method for using the same. Background technique [0002] Horizontal wells are more and more widely used in the development of low-permeability reservoirs. Cased well completion horizontal wells have the advantages of convenient production management and long stable production period, and have gradually become one of the main production and completion methods. However, after horizontal well fracturing is put into production, it may communicate with natural fractures, resulting in the injection water rushing, the comprehensive water cut rises rapidly or even completely flooded. Water outflow from horizontal wells reduces oil production or even completely loses oil production capacity, so water outflow from horizontal wells must be blocked. [0003] The production section of a horizontal well can reach hun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/504C09K8/514E21B33/13
CPCC09K8/5045C09K8/514E21B33/13
Inventor 黄志华黄硕
Owner 黄志华
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