High-density water-based drilling fluid for drilling shale

A water-based drilling fluid and drilling fluid technology, which are applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as wellbore instability, and achieve low reservoir damage, low cost, and strong high temperature resistance. Effect

Active Publication Date: 2015-04-15
SOUTHWEST PETROLEUM UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem of wellbore instability when using water-based drilling fluids to drill into deep shale formations, and to suppress the hydration and collapse of shale formations. drilling fluid

Method used

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  • High-density water-based drilling fluid for drilling shale
  • High-density water-based drilling fluid for drilling shale
  • High-density water-based drilling fluid for drilling shale

Examples

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Effect test

example 1

[0013] Example 1: A preparation method for drilling shale with high-density water-based drilling fluid.

[0014] First measure 1000 grams of tap water and raise the water temperature to 65°C, add 30 grams of bentonite for drilling fluid under electric stirring at a low speed of 600r / min, stir for 10 minutes and add 2 grams of Na 2 CO 3 Stir for another 30 minutes. After prehydration for 24 hours at normal temperature and pressure, add 1 gram of drilling fluid under electric stirring at a low speed of 500 r / min. Stir carboxymethyl starch GMS-1 for 5 minutes, add 10 grams of high temperature resistant special resin SPNH-Ⅲ and stir for 5 minutes, add 15 grams of high temperature resistant viscosity reducer JNT-1 and stir for 15 minutes, add 30 grams of lubricating nanoemulsion NL-Ⅲ and stir After 15 minutes, add 10 grams of non-fluorescent white asphalt anti-slump agent WBF-II and stir for 5 minutes; add 30 grams of water-dispersed cationic emulsified asphalt powder SFT-I and st...

example 2

[0015] Example 2: The rolling recovery rate of the high-density water-based drilling fluid system of the present invention was measured using an XGRL-2 type roller heating furnace.

[0016] Table 2 Rolling recovery rate of rock samples (150℃ / 16h)

[0017]

[0018] Table 3 Experimental results of linear expansion of this high-density water-based drilling fluid system

[0019]

[0020] From Table 2 and Table 3, the rolling recovery rate and linear expansion rate experiments of this high-density water-based drilling fluid show that the rolling recovery rate is over 99%, and the 16h linear expansion rate is only 18.47%, which shows that the water-based drilling fluid system has a good suppression performance.

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Abstract

The invention relates to a high-density water-based drilling fluid for drilling shale and solves the problem of wellbore instability during shale stratum drilling of a water-based drilling fluid. The technical scheme is that the high-density water-based drilling fluid is prepared from the following raw materials: 900-1,000 g of tap water, 30-60 g of bentonite, 2-4 g of Na2CO3, 1-3 g of a drilling-fluid polymer salt-resistant tackifying inhibitor CP-1, 3-5 g of drilling-fluid carboxymethyl starch GMS-1, 10-30 g of high-temperature-resistant special resin SPNH-III, 15-25 g of a high-temperature-resistant viscosity reducer JNT-1, 10-30 g of a lubricative nano emulsion NL-III, 10-20 g of a fluorescence-free white asphalt anti-collapse agent WBF-II and 10-30 g of water-dispersing cationic emulsified asphalt power SFT-I; an alkali solution with the mass percentage concentration of 40% is prepared from NaOH to adjust the pH of the system to 9; a hydrocarbon reservoir protection weighting agent YB-I is adopted to increase the density of the system to 1.8-2.0 g / cm<3>. The high-density water-based drilling fluid is low in cost and high in inhibition performance, causes little reservoir damage and is used for drilling a deep shale stratum.

Description

technical field [0001] The invention relates to a high-density water-based drilling fluid for shale gas development and drilling into shale, and is particularly suitable for drilling deep formations in long horizontal well sections of shale with micro-fractures. Background technique [0002] At present, with the rise of unconventional energy shale gas in China, after a new round of resource assessment, shale gas has been proved to have a wide range of exploration prospects in my country. , the top priority of ensuring national energy security, at the same time some key scientific issues surrounding shale gas development have also been put on the agenda. In the past, shale formations were studied as non-reservoirs, but as the exploration and development of shale gas entered the substantive stage of industrial exploitation, shale formations were developed as the main reservoir. The Xi Formation and Qiongzhusi Formation reservoirs are both hard and brittle shale formations. Com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/24
CPCC09K8/24
Inventor 白杨王平全王波杜敬国时海涛余冰洋
Owner SOUTHWEST PETROLEUM UNIV
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