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Following-drilling plugging agent and preparation technology thereof

A plugging-while-drilling and preparation technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of softening failure, easy gelatinization of resin, etc., achieve low cost, convenient operation, and reduce leakage Effect

Active Publication Date: 2016-01-13
CHINA PETROCHEMICAL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the used husk powder and oil-soluble resin are prone to gelatinization or softening and failure at high temperature

Method used

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  • Following-drilling plugging agent and preparation technology thereof
  • Following-drilling plugging agent and preparation technology thereof
  • Following-drilling plugging agent and preparation technology thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0027] The invention provides a plugging agent while drilling, comprising limestone powder, aluminum oxide, quicklime powder, sodium bentonite, expansion agent, methyl glucoside and mineral fiber, the diameter of the mineral fiber is 50-60 μm, and the length is 0.5- Between 1mm, the temperature resistance is 180°C.

[0028] Preferably, the mass ratio of the limestone powder, alumina, quicklime powder, sodium bentonite, swelling agent and methyl glucoside to the mineral fiber is 85:15.

[0029] Preferably, the mass proportions of limestone powder, alumina, quicklime powder, sodium bentonite, expansion agent and methyl glucoside are respectively: 35%, 20%, 20%, 15%, 5%, and 5%.

[0030] Preferably, the preparation process of the lost circulation agent while drilling comprises the following steps:

[0031] (1) Mixing: First mix 35kg of limestone powder, 20kg of alumina, 20kg of quicklime powder, 15kg of sodium bentonite, 5kg of expansion agent, and 5kg of methyl glucoside;

[0...

Embodiment 2

[0036] The invention provides a plugging agent while drilling, comprising limestone powder, aluminum oxide, quicklime powder, sodium bentonite, expansion agent, methyl glucoside and mineral fiber, the diameter of the mineral fiber is 40-50 μm, and the length is 0.5-50 μm. Between 1mm, the temperature resistance is 190°C.

[0037] Preferably, the mass ratio of the limestone powder, alumina, quicklime powder, sodium bentonite, swelling agent and methyl glucoside to the mineral fiber is 85:15.

[0038] Preferably, the mass proportions of limestone powder, alumina, quicklime powder, sodium bentonite, expansion agent and methyl glucoside are respectively: 34%, 19%, 21%, 14%, 6%, and 6%.

[0039] Preferably, the preparation process of the lost circulation agent while drilling comprises the following steps:

[0040] (1) Mixing: First mix 34kg limestone powder, 19kg alumina, 21kg quicklime powder, 14kg sodium bentonite, 6kg expansion agent, and 6kg methyl glucoside;

[0041] (2) Gri...

Embodiment 3

[0045] The invention provides a plugging agent while drilling, comprising limestone powder, aluminum oxide, quicklime powder, sodium bentonite, expansion agent, methyl glucoside and mineral fiber, the diameter of the mineral fiber is 30-40 μm, and the length is 0.5- Between 1mm, the temperature resistance is 180°C.

[0046] Preferably, the mass ratio of the limestone powder, alumina, quicklime powder, sodium bentonite, swelling agent and methyl glucoside to the mineral fiber is 85:15.

[0047] Preferably, the mass proportions of limestone powder, alumina, quicklime powder, sodium bentonite, expansion agent and methyl glucoside are respectively: 36%, 21%, 19%, 16%, 4%, 4%.

[0048] Preferably, the preparation process of the lost circulation agent while drilling comprises the following steps:

[0049] (1) Mixing: First mix 36kg of limestone powder, 21kg of alumina, 19kg of quicklime powder, 16kg of sodium bentonite, 4kg of expansion agent, and 4kg of methyl glucoside;

[0050]...

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Abstract

The invention provides a following-drilling plugging agent. The following-drilling plugging agent comprises limestone powder, aluminum oxide, quicklime powder, sodium bentonite, an expanding agent, methyl glucosides and mineral fibers; the diameter of the the mineral fibers is smaller than or equal to 60 microns, the length ranges from 0.5 mm to 1 mm, and the mineral fibers can bear the temperature over 170 DEG C. A preparation technology of the following-drilling plugging agent comprises the steps of mixing, grinding and stirring. The following-drilling plugging agent is applied to stratum leakage of pores with the diameters of the pore throat smaller than or equal to 1 mm and microcracks with the widths of cracks smaller than or equal to 1 mm in well drilling, a mud cake can be rapidly formed, the microcracks with different widths can be plugged, and therefore the purposes of following-drilling leakage prevention and leakage stoppage are achieved; good compatibility is achieved, the following-drilling plugging agent can be suitable for drilling fluid with different densities for different systems, effective plugging for leakage of the microcracks can be achieved, the preparation technology is simple, and operation is convenient.

Description

technical field [0001] The invention relates to the technical field of oil drilling plugging, in particular to a plugging agent while drilling and a preparation process thereof. Background technique [0002] During oil drilling operations, due to the existence of cracks or pores in the formation, low formation pressure coefficient and other reasons, lost circulation occurs from time to time. Problems such as well wall instability, collapse, and blowout induced by lost circulation have long been a worldwide problem in the process of oil and gas exploration and development, and are the main technical bottleneck restricting the speed of exploration and development. At the same time, lost circulation caused huge time and economic losses. The damage to the reservoir caused by leakage in the reservoir is even more incalculable. [0003] Lost circulation is the result of the combined action of subjective and objective factors. The existence of pores and fractures in the formation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03C09K8/467
CPCC09K8/03C09K8/426C09K8/467C09K2208/08C09K2208/18
Inventor 许先仿游云武章文斌危胜宏宋金初喻先进周超群方琴
Owner CHINA PETROCHEMICAL CORP
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