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High-strength self-degradable sealing material and preparation method thereof

A self-degrading, high-strength technology, applied in chemical instruments and methods, drilling composition, fermentation, etc., can solve the problems of affecting production capacity, pollution in the production level, low strength, etc., to ensure the isolation effect, good Self-degradable, high-strength effect

Active Publication Date: 2015-09-23
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, the conventional gel material itself has low strength, which is easy to cause "gravity slump" and "vomiting" in the annulus; the density of inorganic thixotropic cement material is high and the gravity is strong, so it is easy to not completely fill the entire annulus, and the process is safe. Still can't meet the requirement
On the other hand, conventional gel materials and thixotropic cement cannot degrade by themselves, both of which will pollute the production horizontal section and cannot restore the original physical properties of the formation, seriously affecting production capacity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Slowly add 1 part of guar gum powder to 66.699 parts of tap water, stir to dissolve; add 30 parts of sodium acrylate solution; then add 0.001 parts of strength regulator, 2.0 parts of peroxide, and finally add 0.3 parts of β-mannanase, stir Evenly, put it in a 60°C incubator to react for 12h.

[0024] The material is a highly elastic solid, the polymerization time is 1 hour, and the maximum shear strength is 500N. After 12 hours, the strength begins to decrease, and after 96 hours, it degrades into a dark brown liquid with a viscosity of less than 5.0MPa·S. The breakthrough pressure gradient and core permeability recovery rate were tested by sand-packing pipe physical model experiments, which were 38MPa / m and 95% respectively.

Embodiment 2

[0026] Slowly add 30 parts of guar gum powder to 50 parts of tap water, stir to dissolve; add 5 parts of potassium acrylate solution and 5 parts of acrylamide solution; add 0.009 parts of strength regulator, 0.001 part of peroxide, and finally add 9.99 parts of β-manna Glycanase, stirred evenly, put in a 60°C incubator to react for 12h.

[0027] The material is a highly elastic solid, the polymerization time is 3 hours, and the maximum shear strength is 800N. After 12 hours, the strength begins to decrease, and after 96 hours, it degrades into a dark brown liquid with a viscosity of less than 5.0MPa·S. The breakthrough pressure gradient and core permeability recovery rate were tested by sand-packing pipe physical model experiments, which were 40MPa / m and 92% respectively.

Embodiment 3

[0029] Slowly add 15 parts of guar gum powder to 50.5 parts of tap water, stir to dissolve; add 30 parts of acrylamide solution; then add 2 parts of strength regulator, 1 part of peroxide, and finally add 1.5 parts of β-mannanase, stir Evenly, put it in a 50°C incubator to react for 12h.

[0030] The material is a viscoelastic solid, the polymerization time is 1.5 hours, and the maximum shear strength is 850N. After 12 hours, the strength begins to decrease, and after 96 hours, it degrades into a light brown liquid with a viscosity of less than 5.0MPa.s. The breakthrough pressure gradient and core permeability recovery rate were tested by sand-filled pipe physical model experiments, which were 43MPa / m and 90% respectively.

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Abstract

The invention discloses a high-strength self-degradation packing material and a preparation method thereof, and relates to chemical water plugging of a high-water-cut horizontal well. The material is prepared from the following components in portion by weight: 5-30 portions of acrylate, 0-30 portions of acrylamide, 1-30 portions of guanidine gum, 0.001-2.0 portions of strength adjusting agent, 0.001-2.0 portions of peroxide, 0.3-10 portions of beta-mannase and 50-75 portions of water. All components are uniformly mixed and stirred according to certain proportion and order, mixed liquor over a moderate amount is poured into the predetermined horizontal section of the horizontal well, and the separation of the horizontal section can be realized after 4-12 hours. The material has high strength and strong water absorbability, and the phenomenon that the conventional gel material has poor annular plugging at the horizontal section of the horizontal well is overcome. The material can be completely self-degraded after 96 hours, and the pollution problem of the conventional water plugging material to the horizontal section of production is solved. Thus, the material can be used as an annular packing material for water plugging of the horizontal well and plugging.

Description

technical field [0001] The invention relates to an annulus sealing material for water plugging and plugging of horizontal wells, which is suitable for segmental plugging of screen pipe (or slotted liner) completion horizontal section water of horizontal wells and injection water of water injection development blocks Channeling into production horizontal wells along the high-permeability zone, and fractured formations, etc. cause high water cut in horizontal wells. Background technique [0002] At present, horizontal wells (highly deviated wells) have low water cut oil production period, short oil production period and fast water cut rise rate. The problem of high water cut is more prominent in the middle and late stages of development, and the production declines rapidly, which seriously affects the productivity of horizontal wells. Horizontal wells in eastern oilfields in my country basically use casing + screen or precision sand filter screen for well completion, and there...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/44C12P19/14
Inventor 程静葛红江雷齐玲刘希君杨卫华张龙江朱杰
Owner PETROCHINA CO LTD
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