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Annular chemical packer material for water plugging of horizontal well

A packer and horizontal well technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as thixotropy, unsatisfactory process safety, strong gravity, and poor process controllability.

Active Publication Date: 2010-12-01
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Relying on external factors to improve the self-supporting ability of materials is easy to cause poor controllability of the process due to complex underground factors and other reasons, and the pre-crosslinking effect is easily affected by high shear; the concept of thixotropy is emphasized in the development of inorganic thixotropic cement.
However, the thixotropic cement material itself has a strong gravity effect, the structural recovery speed is about several hundred seconds, and there are certain process risks. It still cannot meet the requirements in terms of thixotropy and process safety. Foreign indoor simulations can fill 90% of the annular space. for craft success

Method used

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  • Annular chemical packer material for water plugging of horizontal well
  • Annular chemical packer material for water plugging of horizontal well
  • Annular chemical packer material for water plugging of horizontal well

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] In parts by weight, add 30 parts of aluminum-iron mixed-layer metal hydroxide and 10 parts of dibromo-bis(dimethyldodecyl)ethylene diammonium to 100 parts of water, stir and dissolve at room temperature, and let it stand still for reaction For 12 hours, synthesize the thixotropic control component; then, add 20 parts of polyacrylamide, N-methylolacrylamide and 0.5 parts of tert-butyl peroxide into the synthesized thixotropic control Components, stir evenly to form ACP material.

[0040] The power law exponent of the ACP material is 0.14, and the final thixotropic structural strength is 0.83Kpa. After shearing, the thixotropic structural strength can be recovered quickly after standing still for about 5 seconds; Become a high-strength viscoelastic solid with a strength of 790.0KPa.

[0041] Prepare a 1-meter-long process model based on the actual wellbore size ( image 3 ). The synthetically prepared ACP material was dyed and injected into the horizontal annulus to ob...

Embodiment 2

[0044]In parts by weight, add 10 parts of aluminum-magnesium mixed-layer metal hydroxide and 1 part of dibromo-bis(dimethyldodecyl)ethylenediammonium to 100 parts of water, stir and dissolve at room temperature, and let it stand still for reaction For 12 hours, synthesize the thixotropic control component; then, add 5 parts of polyoxyethylene ether, N-methylolacrylamide and 0.1 part of tert-butyl peroxide into the synthetic thixotropic In the control component, stir evenly to form ACP material.

[0045] The power law exponent of the ACP material is 0.20, and the final thixotropic structural strength is 0.58Kpa, and the thixotropic structural strength can be recovered rapidly in about 18 seconds after shearing; within 4.5 hours, the thixotropic body with a certain structural strength becomes a high-strength viscous Elastic solid, the strength reaches 207.4KPa.

[0046] Prepare a 1-meter-long process model based on the actual wellbore size ( image 3 ). The synthetically prep...

Embodiment 3

[0049] In parts by weight, add 20 parts of sodium montmorillonite and 5 parts of amide-type gemini quaternary ammonium salt into 100 parts of water, stir and dissolve at room temperature, and leave to stand for reaction for 12 hours to synthesize the thixotropic control component; then, acrylamide 15 parts, 1 part of N-methylolacrylamide and tert-butyl peroxide are added to the synthesized thixotropic control component according to the weight ratio of 1:0.1-5, and stirred evenly to form an ACP material.

[0050] The power law exponent of this ACP material is 0.30, and the final thixotropic structural strength is 0.32Kpa. After shearing, the thixotropic structural strength can be recovered rapidly in about 30 seconds, and the thixotropic body with a certain structural strength will continue to become a high-strength thixotropic substance within 1 hour. Viscoelastic solid, the strength reaches 30.7KPa.

[0051] Prepare a 1-meter-long process model based on the actual wellbore si...

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Abstract

The invention relates to an annular chemical packer material for the water plugging of a horizontal well, which comprises the following components in part by weight: 10 to 30 parts of thixotropy control agent, 0.1 to 10 parts of structure strengthening agent, 5 to 20 parts of strength controlling agent, 0.01 to 1 part of crosslinker assistant and 100 parts of water, wherein the thixotropy control agent is one or more of aluminum-iron mixed layer metal hydroxides, aluminum-magnesium mixed layer metal hydroxides and sodium-based imvite; the structure strengthening agent is one or more of dibromo-bis(dimethyldodecyl)ethyl diammonium and amide gemini quaternary ammonium surfactant; the strength control agent is the polymer of one or more of polyacrylamide, m-phenol and polyoxyethylene ether, which have double bond, methylene or phenyl functional groups; the crosslinker assistant consists of N-methylol acrylamide and a tert-butyl peroxide in a mass ratio of 1:0.1-5; and gelatinization is realized within 1 to 6 hours, and the gelatinization strength is improved by 100 to 1,000 times.

Description

technical field [0001] The invention relates to a material for water plugging in horizontal wells, which can form a high-strength impermeable chemical sealing slug in the horizontal annular space between the slotted screen pipe and the well wall, and act as an annular chemical packer (Annular Cement Packer). Background technique [0002] Horizontal wells have become an important technical means to speed up production capacity construction, improve oil recovery efficiency, and increase recoverable reserves in the development process of the petroleum industry. However, the problem of water production has seriously affected its overall development effect. Water cut wells are shut down, and the comprehensive water cut of horizontal wells put into production in Jidong Oilfield has reached over 95%. Jilin, Liaohe, and Dagang also have this problem to varying degrees. However, due to the special well structure and completion method of horizontal wells, the research on water plugg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/42
Inventor 魏发林刘玉章李宜坤熊春明
Owner PETROCHINA CO LTD
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