Leak-stopping agent for petroleum drilling, preparation method, and application thereof

A technology for oil drilling and loss-stopping agent, which can be used in chemical instruments and methods, earth-moving drilling, wellbore/well components, etc., and can solve problems such as poor leakage-stopping effect

Active Publication Date: 2012-05-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can solve the problem of poor plugging effect under complex geological conditions

Method used

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  • Leak-stopping agent for petroleum drilling, preparation method, and application thereof
  • Leak-stopping agent for petroleum drilling, preparation method, and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Plugging fluid A:

[0038] water: 100;

[0039] Alginate: 0.5;

[0040] The plugging fluid B is:

[0041] water: 100;

[0042] Oil well cement: 200;

[0043] 3mm polyester fiber: 0.5.

[0044] The configuration method of plugging solution A is: add alginate into water and stir for 15 minutes;

[0045] The configuration method of the plugging fluid B is as follows: water and oil well cement are first configured into cement slurry, and then fibers are added.

[0046] Plugging liquid A and plugging liquid B are sequentially added into the plugging simulation device at a volume ratio of 1:2 (man-made crack width is 2 mm), and slowly pressurized to 7 MPa (the maximum allowable pressure of the instrument is 7 MPa), and after 30 minutes the pressure It is reduced to 6.5MPa, indicating that the pressure-bearing strength of the plugging agent can reach 7MPa.

Embodiment 2

[0048] Plugging fluid A:

[0049] water: 100;

[0050] Alginate: 0.7;

[0051] Fine walnut shells: 3.

[0052] The plugging fluid B is:

[0053] water: 100;

[0054] Oil well cement: 220;

[0055] 3mm polypropylene fiber: 0.5.

[0056] The configuration method of plugging solution A is as follows: first prepare the alginate aqueous solution, stir for 15 minutes, and then add fine walnut shells;

[0057] The configuration method of the plugging fluid B is as follows: first prepare the cement slurry, and then add the fiber.

[0058] Plugging liquid A and plugging liquid B are sequentially added into the plugging simulation device at a volume ratio of 1:2 (man-made fracture width is 3 mm), and slowly pressurized to 7 MPa (the maximum allowable pressure of the instrument is 7 MPa), and after 30 minutes the pressure down to 6.8MPa, indicating that the pressure-bearing strength of the plugging agent can reach 7MPa.

Embodiment 3

[0060] Plugging fluid A:

[0061] water: 100;

[0062]Alginate: 0.7;

[0063] Medium walnut shells: 4.

[0064] The plugging fluid B is:

[0065] water: 100;

[0066] Oil well cement: 225;

[0067] 5mm polyester fiber: 0.6.

[0068] The configuration method of plugging solution A is as follows: first prepare the alginate aqueous solution, stir for 15 minutes, and then add walnut shells;

[0069] The configuration method of the plugging fluid B is: first configure the cement slurry, and then add the fiber;

[0070] Plugging liquid A and plugging liquid B are sequentially added into the plugging simulation device at a volume ratio of 1:2 (man-made fracture width is 4 mm), and slowly pressurized to 7 MPa (the maximum allowable pressure of the instrument is 7 MPa), and after 30 minutes the pressure down to 6.7MPa, indicating that the pressure-bearing strength of the plugging agent can reach 7MPa.

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Abstract

The present invention discloses a leak-stopping agent for petroleum drilling, a preparation method, and an application thereof. The leak-stopping agent comprises a leak-stopping liquid A and a leak-stopping liquid B, wherein the leak-stopping liquid A comprises, by weight, 0.5-0.8 parts of alginate, 0-5 parts of walnut shells and 100 parts of water, the leak-stopping liquid B comprises, by weight, 200-250 parts of oil well cement, 0.5-1 parts of fiber, and 100 parts of water, and a volume ratio of the leak-stopping liquid A to the leak-stopping liquid B is 1:2-1:3. The preparation method comprises: a, dissolving the alginate in the water to prepare a solution, and adding the walnut shells to the solution to prepare the leak-stopping liquid A; b, preparing the oil well cement and the waterinto the cement slurry, and adding the fiber to the cement slurry to prepare the leak-stopping liquid B. With the leak-stopping agent of the present invention, the problem of the poor leak-stopping effects under complex geological conditions of cracks and holes can be solved, and the leak-stopping effects of the stratum with the cracks and the large holes can be ensured.

Description

technical field [0001] The invention relates to the field of oil drilling, and more particularly relates to a plugging agent for oil drilling and a preparation method and application thereof. Background technique [0002] For lost circulation caused by fractures and holes, bridge plugging materials, chemical plugging materials and inorganic gel plugging agents are mainly used. For the pores with unclear formation fractures or large holes, at present, the method of bridge plugging is mainly used to plug the lost zone, and the formation conditions are gradually explored to seal the lost zone, or chemical plugging materials and inorganic gelling plugging agents are used to plug the lost zone. [0003] Bridging plugging is a plugging method that uses inert materials of different shapes and sizes, mixed in mud with different formulations, and directly injected into the leaky layer. When bridging plugging, the proper gradation and concentration should be selected according to the...

Claims

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Application Information

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IPC IPC(8): C09K8/46E21B33/13E21B33/134
Inventor 刘金华刘四海赵素丽石秉忠李胜江山红张凤英
Owner CHINA PETROLEUM & CHEM CORP
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