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Strong inhibitive drilling fluid for drilling shale

A drilling fluid and strong suppression technology, applied in the direction of drilling composition, chemical instruments and methods, can solve problems such as wellbore instability, and achieve the goals of preventing wellbore collapse, good rheology, and strong suppression and plugging ability Effect

Active Publication Date: 2017-03-22
SOUTHWEST PETROLEUM UNIV
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  • 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 drilling deep shale formations with water-based drilling fluids, and to suppress the hydration and collapse of shale formations, a strong inhibitory drilling method for drilling shale formations is specially provided. liquid

Method used

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  • Strong inhibitive drilling fluid for drilling shale
  • Strong inhibitive drilling fluid for drilling shale
  • Strong inhibitive drilling fluid for drilling shale

Examples

Experimental program
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Effect test

example 1

[0018] Example 1: A preparation method for drilling into shale with strong inhibitory drilling fluid.

[0019] First measure 900-1000 grams of tap water, 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, and pre-hydrate for 24 hours at normal temperature and pressure; then add 0.3 grams of drilling fluid with strong inhibitory fluid loss reducer JT900 under low-speed 500r / min electric stirring, stir for 10 minutes, and add 0.5 grams of strong potassium inhibitor FK- 1 Stir for 5 minutes, add 2 grams of drilling fluid coating agent FK-421 and stir for 5 minutes, add 1 gram of shale inhibitor NF-923 and stir for 15 minutes, add 1 gram of cationic viscosity reducer XH-1 and stir for 15 minutes, add 2 grams of shale stabilizer DLSAS and stirred for 15 minutes; then added 4 grams of reservoir shielding agent QCX-1 and sti...

example 2

[0020] Example 2: XGRL-2 type roller heating furnace was used to measure the rolling recovery rate of the highly inhibited drilling fluid system used for drilling shale.

[0021] Table 2 Rolling recovery rate of rock samples (150°C / 16h)

[0022]

[0023] Table 3. Experimental results of linear expansion of the strongly inhibited drilling fluid system used for drilling shale.

[0024]

[0025] From Table 2 and Table 3, the rolling recovery rate and linear expansion rate experiment of the strong inhibitory drilling fluid system used for drilling shale shows that the rolling recovery rate reaches more than 99%, and the 16h linear expansion rate is only 18.02%, which shows that the water-based drilling The liquid system has better inhibitory properties.

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Abstract

The invention relates to a strong inhibitive drilling fluid for drilling shale for shale gas development and solves the problem of wellbore instability, and hydration collapse of the shale stratum is inhibited. The technical scheme of the strong inhibitive drilling fluid is that the the drilling fluid is prepared from the compositions of, by mass unit, 900-1,000 g of tap water, 30-60 g of bentonite for drilling fluid, 2-4 g of Na2CO3, 0.3-1 g of strong inhibitive filtrate reducer JT900 for drilling fluid, 0.5-1 g of potassium strong inhibitor FK-1, 2-5 g of coating agent FK-421 for drilling fluid, 1-1.5 g of shale inhibitor NF-923, 1-2 g of positive ion viscosity reducer XH-1, 2-3 g of shale stabilizer DLSAS, 4-6 g of reservoir shielding agent QCX-1, 2-4 g of blocking agent DE-1 and 0.5-1 g of lubricant RT-881 for drilling fluid; finally, the alkali liquor with the mass percentage concentration of 40% is prepared by adding water to NaOH, the system PH is adjusted to be 8.5, the drilling fluid weighting agent baryte is used for weighting the the system density to be 1.8-2.0 g / cm<3>, and the drilling liquid is prepared. The drilling fluid system has small environment pollution, and the drilling liquid has excellent rheological property and high sealing capacity and is used for drilling the shale.

Description

technical field [0001] The invention relates to a strong inhibitory drilling fluid for shale gas development and drilling into shale, and is especially suitable for drilling into 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. Compare...

Claims

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Application Information

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IPC IPC(8): C09K8/18C09K8/24
CPCC09K8/18C09K8/24C09K2208/12
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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