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Well wall film formation anti-sloughing drilling fluid

A drilling fluid and drilling fluid density technology, applied in the directions of drilling compositions, chemical instruments and methods, can solve problems such as wellbore instability, prevent wellbore collapse, reduce environmental pollution, and strongly inhibit plugging capabilities Effect

Inactive Publication Date: 2016-08-17
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is: in order to overcome the problem of wellbore instability when using water-based drilling fluid to drill into shale formations, suppress the hydration and collapse of shale formations, and effectively plug the micro-nano pores and fractures of shale formations. A kind of well wall film-forming anti-slump drilling fluid

Method used

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Examples

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example 1

[0017] Example 1: A preparation method of well wall film-forming anti-collapse drilling fluid.

[0018] First measure 1000 grams of tap water, raise the water temperature to 70°C, add 30 grams of bentonite for drilling fluid under electric stirring at a low speed of 500r / min, stir for 10 minutes, and add 1.5 grams of Na 2 CO 3 Stir for another 30 minutes, and pre-hydrate for 24 hours at normal temperature and pressure; then add 4 grams of drilling fluid with high-efficiency viscosifier 80A51 under high-speed 8000r / min electric stirring and stir for 5 minutes, and add 20 grams of drilling fluid under low-speed 500r / min electric stirring Anti-compound salt fluid loss agent YJB-II and stir for 5 minutes, add 20 grams of drilling fluid with anti-slump fluid loss agent GSP and stir for 5 minutes, add 10 grams of anti-slump lubricant K-31 and stir for 5 minutes, add 20 grams of drilling fluid for film-forming Add CMJ-1 agent and stir for 20 minutes, add 15 grams of drilling fluid i...

example 2

[0019] Example 2: The rolling recovery rate of the well wall film-forming anti-slump drilling fluid system of the present invention was measured by using an XGRL-2 type roller heating furnace.

[0020] Table 2 Rolling recovery rate of rock samples (150°C / 16h)

[0021]

[0022] Table 3. Experimental results of linear expansion of the well wall film-forming anti-slump drilling fluid system

[0023]

[0024] From Table 2 and Table 3, the rolling recovery rate and linear expansion rate experiment of the well wall film-forming anti-collapse drilling fluid system shows that the rolling recovery rate reaches more than 99%, and the 16h linear expansion rate is only 18.17%, which shows that the well wall film-forming anti-collapse drilling fluid system The slump drilling fluid system has good suppression performance.

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Abstract

The invention relates to well wall film formation anti-sloughing drilling fluid applied to shale gas exploitation and shale drilling. The well wall film formation anti-sloughing drilling fluid solves the problem of wellbore instability, restrains hydrated collapse of a shale stratum and effectively plugs micro-nanometer holes of shale. The well wall film formation anti-sloughing drilling fluid is characterized by being prepared from raw materials of the content by mass unit of gram: 900-1000 of tap water, 30-60 of bentonite for drilling fluid, 1.5-2.5 of Na2CO3, 2-4 of high-efficiency thickening agent 80A51 for the drilling fluid, 10-20 of anti-compound salt filtrate reducer YJB-II for the drilling fluid, 10-15 of anti-sloughing filtrate reducer GSP for the drilling fluid, 10-20 of anti-sloughing lubricant K-31, 10-20 of film forming agent CMJ-1 for the drilling fluid and 15-20 of restraining anti-sloughing agent ZNP-I for the drilling agent. NaOH and water are prepared into alkali liquor with a mass percentage concentration as 40%, a system pH is adjusted as 8.5, the raw materials are stirred for 30 minutes, and a system density is aggravated to 1.20g / cm<3> through weighting agent barite for the drilling fluid, and the drilling fluid can be obtained. The drilling fluid system is small in environmental pollution, good in rheological property, strong in restraining and plugging capacity and applied to shale drilling.

Description

technical field [0001] The invention relates to a well wall film-forming anti-collapse drilling fluid for drilling shale, which is particularly suitable for drilling long horizontal well sections of shale with micro-fractures. Background technique [0002] At present, oil-based drilling fluids are commonly used in shale gas wells at home and abroad. Because oil-based drilling fluids can increase the capillary pressure of water-wet shale and prevent drilling fluids from invading shale, oil-based drilling fluids and synthetic-based drilling fluids can be used. Effectively solve the problem of well wall instability. In dealing with the wellbore stability of shale gas horizontal wells, the use of oil-based drilling fluid system is currently the most effective measure abroad. But even if oil-based drilling fluid is used, for shale formations with developed fractures or beddings, it is necessary to strengthen the plugging to reduce the pressure transmission caused by the liquid e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/14
CPCC09K8/14C09K2208/12
Inventor 白杨石晛王平全陈婷陶鹏敬玉娟余冰洋杨萍胡亚琴
Owner SOUTHWEST PETROLEUM UNIV
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