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Gel plugging slurry for drilling, preparation method of plugging slurry and slug plugging method

A technology of plugging slurry and gel, which is applied in drilling compositions, chemical instruments and methods, and earth-moving drilling, etc. low success rate

Active Publication Date: 2019-12-03
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problems in the prior art that the success rate of conventional bridge plugging is very low due to the existence of formation fluid in the leakage layer of the reservoir, and the low success rate of single bridge plugging and single condensation In order to solve the problem of low pressure bearing capacity of the rubber, a kind of gel plugging slurry for drilling, a preparation method of the plugging slurry and a slug plugging method are provided. The gel slug plugging method for drilling of the present invention has the advantages of simple construction, The advantage of low environmental requirements; moreover, the bridging material, connecting material and filling material in the gel plugging slurry of the present invention form a stable structure inside the gel, thereby effectively improving the plugging effect of the gel

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  • Gel plugging slurry for drilling, preparation method of plugging slurry and slug plugging method

Examples

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preparation example Construction

[0041] A kind of preparation method of gel plugging slurry for drilling according to a preferred embodiment of the present invention, wherein, the method comprises the following steps:

[0042] (1) Pour water into the mixer and stir evenly at 2000-4000 rpm, add special gel and stir evenly for 10-20 minutes;

[0043] (2) Slowly add the bridging material along the stirring rod and stir evenly for 25-35 minutes;

[0044] (3) Slowly add the connecting material along the stirring rod and stir evenly for 25-30 minutes;

[0045] (4) Finally, slowly add the filling material along the stirring bar and stir evenly for 10-15 minutes.

[0046] Among them, in the present invention, the advantage of adding slowly along the stirring rod is that it can make the solid phase components more uniformly dispersed in the lost circulation slurry.

[0047] Wherein, in the present invention, the slow adding speed may be 0.5-2 g / s, preferably 1-1.5 g / s.

[0048] The third aspect of the present inven...

Embodiment 1

[0061] This example is to illustrate the gel plugging slurry prepared by the preparation method of the present invention

[0062] Add 6g of special gel ZND-2 to 100 ml of tap water (this special gel is a light yellow transparent particle, the particle size is between 8mm, at a shear rate of 1200s -1 Under conditions, the viscosity is 30mPa.s), and after stirring for 15 minutes under the environment of 3000 rev / min at the stirring rate, slowly add 5g glass fiber and 10g asbestos fiber along the stirring rod, and under the environment of 3000 rev / min at the stirring rate After stirring for 30 minutes, slowly add 30g of walnut shells (the particle size of the walnut shells is 5mm) along the stirring rod, and then slowly add 35g of nanobarite powder along the stirring rod after stirring for 27 minutes at a stirring rate of 3000 rpm (The particle size of the nanobarite powder is 5 μm). After stirring for 12 minutes, the plugging slurry A1 was obtained.

[0063] A plugging instrume...

Embodiment 2

[0065] This example is to illustrate the gel plugging slurry prepared by the preparation method of the present invention

[0066] According to the same method as in Example 1 to prepare the plugging slurry, the difference is: 3g of special gel ZND-2 is added to 100 milliliters of tap water (this special gel is light yellow transparent particles, and the particle size is between 5mm between, at a shear rate of 1000s -1 Under conditions, the viscosity is 20mPa s), and after stirring for 10 minutes under the environment of 2000 rev / min at the stirring rate, slowly add 2g glass fiber and 12g asbestos fiber along the stirring rod, and under the environment of 2000 rev / min at the stirring rate Stir for 25 minutes, then slowly add 25g of walnut shells along the stirring rod, stir for 25 minutes at a stirring rate of 2000 rpm, then slowly add 30g of nanobarite powder along the stirring rod, and stir for 10 minutes to obtain plugging Pulp A2.

[0067] A plugging instrument was used t...

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Abstract

Disclosed are a gel plugging slurry for well drilling, a preparation method of the plugging slurry, and a slug plugging method. The gel plugging slurry comprises water, a specialty gel, a bridging material, a jointing material and a filling material, in amounts of 1-15 parts by weight of the specialty gel, 8-20 parts by weight of the bridging material, 20-40 parts by weight of the jointing material and 25-45 parts by weight of the filling material based on 100 parts by weight of water. The gel plugging slurry has a short wait-on-cement time at rest, exhibits a rapid effect, and can quickly form a structure at fractures in a leakage formation; and the bridging material, the jointing material and the filling material can effectively plug various fractures that vary widely in width. In the slug plugging method, a packer is lowered to pack a well bore, so as to ensure that the plugging slurry can accurately reach the leakage formation and to enhance plugging efficiency.

Description

technical field [0001] The invention relates to the field of oil industry drilling plugging, in particular to a gel plugging slurry for drilling, a preparation method of the plugging slurry and a slug plugging method. Background technique [0002] Bridge plugging technology is widely used at home and abroad, and it has the advantages of high speed, low cost, and simple operation. The plugging particles used in bridge plugging can be as large as a few millimeters or even a few centimeters, and as small as tens of microns. , can play a role in slowing down the leakage, or completely blocking the leakage layer and improving the pressure bearing capacity. However, due to the presence of formation fluid in the leakage layer of the reservoir, the success rate of conventional bridge plugging is very low; formation fluid refers to oil, natural gas, water and their mixtures in the formation, such as oilfield water that dissolves inorganic and organic components and natural gas. It ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/44E21B33/13
CPCC09K8/426C09K8/44C09K2208/04C09K2208/08C09K2208/18E21B33/13
Inventor 白杨罗平亚邓嘉丁
Owner SOUTHWEST PETROLEUM UNIV
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