Double-fiber fine blocking agent along with drilling, and preparation method thereof

A fiber and while-drilling technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of high cost, complicated process, and leak prevention, and achieve the effects of low cost of use, simple preparation process, and leak prevention

Inactive Publication Date: 2017-03-08
中国石油集团川庆钻探工程有限公司长庆钻井总公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used plugging agents while drilling include one-way pressure temporary plugging agent, sawdust, bridge plugging agent, mica, etc. Some plugging agents have a certain effect of plugging while drilling, but they have high cost, complicated process, and Leakage, poor plugging effect, etc., especially for the formation of Liujiagou Formation in Changqing Oilfield.

Method used

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  • Double-fiber fine blocking agent along with drilling, and preparation method thereof
  • Double-fiber fine blocking agent along with drilling, and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021] In order to overcome the existing problems, the present invention proposes a dual-fiber fine plugging agent while drilling, which includes the following components: 100 parts mica, 30-80 parts wood fiber, and 20-60 parts brucite fiber in parts by mass.

[0022] The mica is one or more of sericite, muscovite, phlogopite, lepidolite, and biotite. Mica is used as filling particles in the dual-fiber while drilling fine plugging agent of the present invention, and is filled in the gaps of the network skeleton formed by long fibers to form denser slugs and reduce drilling fluid and free water penetrating into the formation. According to the size of the pores of the fiber grid and the formation pores or microcracks, the particle size of mica is generally required to be 20-100 mesh.

[0023] The wood fiber is one or more of poplar fiber, willow fiber, pear tree fiber, and locust tree fiber. The wood fiber is a fluffy long fiber with strong flexibility, and plays a role in the skele...

Embodiment 2

[0034] This embodiment provides a dual-fiber fine plugging agent while drilling, which includes the following components: 100 parts sericite, 80 parts poplar fiber, and 60 parts brucite fiber in parts by mass.

[0035] The preparation method of the dual-fiber fine plugging agent while drilling is as follows:

[0036] Step 1) Crush 100 parts of sericite to a particle size of 20-100 mesh;

[0037] Step 2) Soak 80 parts of the trunk and branches of poplar trees in hydrochloric acid with a mass concentration of 25% and a temperature of 95°C. After soaking for 12 hours, wash the acidified trunk and branches with water to a pH of 7, and then dry them. The trunk and branches of poplar trees are crushed to a particle size of 20-40 mesh to obtain poplar fibers;

[0038] Step 3) pulverize 60 parts of brucite fiber to a fiber length of 1-5mm;

[0039] Step 4) 100 parts of sericite, 80 parts of poplar fiber and 60 parts of brucite fiber are mixed uniformly with a kneader to obtain a dual-fiber fin...

Embodiment 3

[0042] This embodiment provides a dual-fiber fine plugging-while-drilling agent as described in Example 2. The dual-fiber fine-plugging-while-drilling agent is mixed with drilling fluid, and the dual-fiber MWD is added at one time per cubic meter of drilling fluid. The mass of the fine plugging agent is 50kg.

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Abstract

The present invention provides a double-fiber fine blocking agent along with drilling, wherein the components comprise, by mass, 100 parts of mica, 30-80 parts of wood fiber, and 20-60 parts of brucite fiber. According to the present invention, the double-fiber fine blocking agent along with drilling provides good rapid leakage blocking effects for osmotic leakage loss or micro-fracture leakage loss, especially for the leakage loss in the Luohe Formation stratum and the Liujiagou formation stratum, can prevent the leakage loss of the drilling fluid in the low pressure bearing stratum, has characteristics of easily available raw material, simple preparation process and low use cost, and does not affect the rheology of the drilling fluid.

Description

Technical field [0001] The invention relates to a drilling fluid treatment agent in the field of petroleum drilling, in particular to a dual-fiber fine plugging agent while drilling and a preparation method thereof. Background technique [0002] In oil drilling production, due to the possibility of pores and fractures in the formation, drilling fluid will be lost from the pores or fractures to the formation. The treatment of lost circulation is generally "combined with blocking prevention". Prevention is a preventive measure. By adding the treatment agent in advance, the pores and cracks near the well wall that have not yet reached the level of leak control are sealed. Plugging means plugging. The commonly used LWD plugging agents include one-way pressure temporary plugging agent, sawdust, bridge plugging plugging agent, mica, etc. Some plugging agents have a certain level of plugging effect while drilling, but they have high costs, complex processes, and prevent Problems such ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/42C09K8/03
CPCC09K8/426C09K8/03
Inventor 胡祖彪金虎陈廷廷简章臣朱明明周波何恩之王清臣贾继国
Owner 中国石油集团川庆钻探工程有限公司长庆钻井总公司
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