Amphoteric potassium-based polyalcohol water-based drilling fluid for drilling shale

An amphoteric potassium-based drilling fluid technology, which is applied to drilling compositions, chemical instruments and methods, etc., can solve the problems of poor pollution resistance, low cost, high temperature gelation, etc., and achieve easy handling, low cost, and easy handling easy effect
CN104592960AActive Publication Date: 2015-05-06SOUTHWEST PETROLEUM UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SOUTHWEST PETROLEUM UNIV
Publication Date
2015-05-06

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Abstract

The invention relates to an amphoteric potassium-based polyalcohol water-based drilling fluid for drilling shale, which overcomes a problem that a well wall is unstable when a water-based drilling fluid drills into a shale ground layer, restrains the shale ground layer from being hydrated and collapsed, and effectively seals shale micro-nano apertures. According to the technical scheme adopted by the invention, the drilling liquid is prepared from the following raw material components by mass (unit: g): 900-1000 g of tap water, 40-60 g of bentonite, 1-3 g of Na2CO3, 2-4 g of an amphoteric ionic polymer coating agent FA367, 1-2 g of an amphoteric ionic polymer viscosity reducer XY-27, 300-400 g of potassium formate, 50-60 g of highlight calcium carbonate C-L501, 0.5-1 g of calcium oxide, 30-40 g of a lubricating agent JHJC-3, 20-30 g of paraffin emulsion JHNP, 10-20 g of polyalcohol JHGC; and 40% alkaline liquor is prepared by NaOH, the pH of the system is regulated to be 9, and the system is uniformly stirred to prepare the amphoteric potassium-based polyalcohol water-based drilling fluid. The water-based drilling fluid is low in cost, good in inhibition performance and used for drilling a shale long horizontal section with microfracture development.
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Description

technical field

[0001] The invention relates to an amphoteric potassium-based polyalcohol water-based drilling fluid used for drilling shale during shale gas development and drilling, and 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 pluggin...

Claims

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