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Drilling fluid weighting agent and preparation method thereof

A technology of weighting agent and drilling fluid, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of oil and gas layer damage, high barite settlement rate, uneven density of drilling fluid, etc., and achieve simple preparation method , easy to popularize and apply, and avoid precipitation problems

Active Publication Date: 2014-12-17
天津大港油田海诚泥浆技术服务股份合作公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The particle size of conventional weighting agents (such as barite powder) is usually between 10 μm and 70 μm. During the application process, there are often phenomena such as high barite sedimentation rate and uneven density of drilling fluid.
At the same time, the clogging of formation rock pore throats by solid particles such as barite also causes certain damage to oil and gas formations.

Method used

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  • Drilling fluid weighting agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A weighting agent for drilling fluid, comprising the following components in parts by weight:

[0025] 60 parts of bauxite, 0.5 parts of lapis lazuli, 1 part of ceresite, 10 parts of silicon micropowder, 0.08 parts of cetyl ethylhexanoate, 0.2 parts of polyoxyethylene (20) sorbitan monolaurate , 0.5 parts of sodium metasilicate pentahydrate, 0.5 parts of modified attapulgite, and 20 parts of water.

[0026] The preparation method of the modified attapulgite is to soak the attapulgite with 11% sodium hydroxide for 1.5 hours, then soak it with 11% hydrochloric acid solution for 1 hour, and then wash it with deionized water to neutrality and dried to obtain modified attapulgite.

[0027] The preparation method of the weighting agent for drilling fluid in this embodiment comprises the following steps:

[0028] Step (1), pulverizing the celestite and phosphatite to 100-200 mesh to obtain celestite powder and phosphatite powder;

[0029] Step (2), add the lapis lazuli powd...

Embodiment 2

[0033] A weighting agent for drilling fluid, comprising the following components in parts by weight:

[0034] 80 parts of bauxite, 2 parts of lapis lazuli, 1.5 parts of phosphatite, 15 parts of silicon micropowder, 0.2 parts of cetyl ethylhexanoate, 0.45 parts of polyoxyethylene (20) sorbitan monolaurate , 2 parts of sodium metasilicate pentahydrate, 1 part of modified attapulgite, and 30 parts of water.

[0035] The preparation method of the modified attapulgite is to soak the attapulgite with 13% sodium hydroxide for 2 hours, then soak it with 12% hydrochloric acid solution for 3 hours, and then wash it with deionized water to neutrality and dried to obtain modified attapulgite.

[0036] The preparation method of the weighting agent for drilling fluid in this embodiment comprises the following steps:

[0037] Step (1), pulverizing the celestite and phosphatite to 100-200 mesh to obtain celestite powder and phosphatite powder;

[0038] Step (2), add the lapis lazuli powder...

Embodiment 3

[0042] A weighting agent for drilling fluid, comprising the following components in parts by weight:

[0043] 68 parts of bauxite, 0.9 parts of lapis lazuli, 1.3 parts of ceresite, 12 parts of silicon micropowder, 0.12 parts of cetyl ethylhexanoate, 0.33 parts of polyoxyethylene (20) sorbitan monolaurate , 0.14 parts of sodium metasilicate pentahydrate, 0.78 parts of modified attapulgite, and 24 parts of water.

[0044] The preparation method of the modified attapulgite is to soak the attapulgite with 12% sodium hydroxide for 1.8 hours, then soak it with 11.5% hydrochloric acid solution for 2 hours, and then wash it with deionized water to neutrality and dried to obtain modified attapulgite.

[0045] The preparation method of the weighting agent for drilling fluid in this embodiment comprises the following steps:

[0046] Step (1), pulverizing the celestite and phosphatite to 100-200 mesh to obtain celestite powder and phosphatite powder;

[0047] Step (2), add the lapis la...

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Abstract

The invention relates to a drilling fluid weighting agent and a preparation method thereof, and belongs to the technical field of oil extraction. The weighting agent comprises the following components by weight: 60-80 parts of bauxite, 0.5-2 parts of lapis lazuli, 1-1.5 parts of monazite, 10-15 parts of silicon micro powder, 0.08-0.2 part of cetyl ethyl hexanoate, 0.2-0.45 part of polyoxyethylene(20) sorbitan monolaurate, 0.5-2 parts of a dispersant, 0.5-1 part of modified attapulgite and 20 to 30 parts of water. The preparation method of the drilling fluid weighting agent is simple, the prepared drilling fluid weighting agent is can improve the stability of the structural properties of mud, has good suspension stability, and can avoid the precipitation problem of a common weighting agent, at the same time, the drilling fluid weighting agent solid product can be directly applied to oil base mud weighting, can maintain for 45 days at high temperature, is far more surpass the common weighting agent in the prior art which can only maintain for 7 days, and is easy in popularization and application.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and in particular relates to a weighting agent for drilling fluid and a preparation method thereof. Background technique [0002] China's oil reserves are insufficient, and China's oil imports are far greater than exports, and the ratio is increasing year by year. It is believed that it will be difficult to see improvement in the future. With the rapid economic growth, China's demand for oil is also rising rapidly. Since 1996, China has become the third largest oil consumer after the United States and Japan. [0003] At present, oil fields in many countries around the world are moving towards deep and ultra-deep exploration and development, and high-density drilling and completion technology has become one of the key technologies to ensure safe and smooth drilling operations. High-density drilling and completion fluids need to add a large amount of solid phase weighting materials...

Claims

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Application Information

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IPC IPC(8): C09K8/03
CPCC09K8/03
Inventor 李瑞国
Owner 天津大港油田海诚泥浆技术服务股份合作公司
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