Leaking stoppage material used for geological core drilling

A technology of plugging materials and filling materials, which is applied in the directions of drilling compositions, chemical instruments and methods, etc., can solve the problems of inability to seal the orifice, low gel strength, and low success rate of plugging, and achieves a high success rate. Effect

Inactive Publication Date: 2016-06-08
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, special gel ZND plugging technology cannot be directly used in geological core drilling plugging
[0008] In summary, in geological core drilling, the plugging success rate of bridge plugging technology and special gel ZND plugging technology is relatively low, because geological drilling holes are generally shallow (hundreds of meters to two kilometers), and flushing fluid The density is generally low, and it cannot generate enough pressure difference to hydraulically inject the bridge plugging material or special gel slurry into the crack, and the orifice cannot be closed, and the pressure holding operation cannot be performed; resulting in the bridge plugging material or special gel slurry Either it cannot enter the fracture, or it cannot reside and accumulate after entering the fracture to form a plugging layer or the gel strength is low
[0009] Therefore, in view of the shortcomings of bridge plugging technology and special gel plugging technology used in geological core drilling engineering, the plugging success rate is low or even unavailable, a new type of high-efficiency plugging material that can adapt to the characteristics of geological core drilling is provided. Under the existing technical conditions of geological core drilling, it can improve the success rate of malignant leakage plugging in geological core drilling, and effectively seal the new type of high-efficiency plugging material in the lost stratum. The exploration process is of great significance

Method used

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  • Leaking stoppage material used for geological core drilling
  • Leaking stoppage material used for geological core drilling
  • Leaking stoppage material used for geological core drilling

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Embodiment 1, preparation of composite plugging material

[0036] 1. According to the calculation of plugging slurry prepared with 10 liters of clean water, take 80g of polymer, 1200g of bridge plug material, and 1253g of filling material in parts by mass;

[0037] The polymer is: special gel ZND; the bridge plug material is: calcium carbonate particles (calcium carbonate particles with a particle size of 2-0.85 mm in mass ratio: calcium carbonate particles with a particle size of <0.85 mm = 9:7) and walnuts Shells (in terms of mass ratio, walnut shells with a particle size of 4 to 3 mm: walnut shells with a particle size of 3 to 2 mm = 7:8) are compounded at a ratio of parts by mass of 3: 2; the filling material is: high water loss plugging material DTR

[0038] 2. At room temperature, first mix the bridge plug material with the filling material, then put in the polymer, and mix evenly to obtain a composite plugging material.

[0039] 3. Under stirring conditions, sl...

Embodiment 2

[0040] Embodiment two, the preparation of composite plugging material

[0041] 1. According to the calculation of plugging slurry prepared with 10 liters of clean water, take 120g of polymer, 1080g of bridge plug material and 1200g of filling material in parts by mass;

[0042] The polymer is: special gel ZND; the bridge plug material is: calcium carbonate particles (calcium carbonate particles with a particle size of 2-0.85 mm in mass ratio: calcium carbonate particles with a particle size of <0.85 mm = 9:7) and walnuts Shells (in terms of mass ratio, walnut shells with a particle size of 4 to 3 mm: walnut shells with a particle size of 3 to 2 mm = 7:8) are compounded at a ratio of parts by mass of 3: 2; the filling material is: high water loss plugging material DTR2. At room temperature, first mix the bridge plug material with the filling material, then put in the special gel ZND, mix evenly, and get the composite plugging material.

[0043] 3. Under stirring conditions, sl...

Embodiment 3

[0044] Embodiment three, the preparation of composite plugging material

[0045] 1. According to the calculation of plugging slurry prepared with 10 liters of water, take 100g of polymer, 1175g of bridge plug material and 1225g of filling material in parts by mass;

[0046] The polymer is: special gel ZND; the bridge plug material is: calcium carbonate particles (calcium carbonate particles with a particle size of 2-0.85 mm in mass ratio: calcium carbonate particles with a particle size of <0.85 mm = 9:7) and walnuts Shells (in terms of mass ratio, walnut shells with a particle size of 4 to 3 mm: walnut shells with a particle size of 3 to 2 mm = 7:8) are compounded at a ratio of parts by mass of 3: 2; the filling material is: high water loss plugging material DTR2. At room temperature, first mix the bridge plug material with the filling material, then put in the polymer, and mix evenly to obtain a composite plugging material.

[0047] 3. Under stirring conditions, slowly add ...

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Abstract

The invention provides a composite leaking stoppage material capable of adapting to geological core drilling characteristics. The composite leaking stoppage material is prepared from 3-5 parts of special gel ZND polymers, 45-47 parts of a bridge plugging material and 47-50 parts of a filling material. Under the condition of an existing geological core drilling technology, the composite leaking stoppage material overcomes the defects that when a special gel leaking stoppage technology is used for geological drilling engineering, the leaking stoppage success rate is low, and even the technology cannot be applied, and the success rate of stoppage of malignant leakage in geological core drilling can be increased.

Description

technical field [0001] The invention belongs to the field of plugging in geological core drilling, and in particular relates to a composite plugging material and a preparation method and application thereof. Background technique [0002] Formation leakage is a common problem often encountered in geological core drilling and even oil, natural gas, geothermal and other drilling. Due to the particularity of geological core drilling in terms of drilling diameter, drilling method, drilling process and equipment conditions, many plugging technologies that have been successfully implemented in oil drilling cannot be used in geological drilling. When geological core drilling encounters fractured formations, large-porosity formations and other formations, loss-of-return vicious losses often occur. Methods to deal with this kind of malignant leakage include bridge plugging, special gel plugging, cement slurry plugging, chemical plugging, etc. Among them, bridge plugging and special ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467
CPCC09K8/426C09K8/467C09K2208/04
Inventor 李之军董洪栋陈礼仪裴向军王胜叶长文袁进科
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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