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Drill-feeding plugging agent used for oil-based drilling fluid, preparation method and application thereof

An oil-based drilling fluid and plugging technology while drilling, which is applied in the field of drilling plugging agents, can solve the problems of oil-based drilling fluid viscosity increase and poor plugging effect while drilling, and achieve the effect of improving plugging effect

Inactive Publication Date: 2017-05-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are few LWD materials specially used for oil-based drilling fluids at home and abroad. Most of the LWD materials used in oil-based drilling fluids are LWD materials in water-based drilling fluids. In the drilling fluid, it will cause the viscosity of the oil-based drilling fluid to increase, and the plugging effect while drilling is not good.

Method used

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  • Drill-feeding plugging agent used for oil-based drilling fluid, preparation method and application thereof
  • Drill-feeding plugging agent used for oil-based drilling fluid, preparation method and application thereof
  • Drill-feeding plugging agent used for oil-based drilling fluid, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The composition of the plugging agent: mica 2g; calcium carbonate 4g; brucite fiber 2g; styrene-butadiene rubber 0.5g.

[0027] Mix 2g of mica, 4g of calcium carbonate, 2g of brucite fiber and 0.5g of styrene-butadiene rubber to make a plugging agent. The volume-to-mass ratio (volume of oil-based drilling fluid: weight of the plugging agent) is 100:3 Weigh the plugging agent, add it to the base slurry, and stir it on the mixer for 20 minutes to make a plugging slurry for later use. After measuring the six-speed plugging slurry with a six-speed rotary viscometer, take 500mL and pour it into the 20-40 mesh sand bed of the FA non-permeable filter loss meter, slowly pressurize to 0.7MPa, and stabilize the pressure for 30min, the filtrate immersion depth is 3cm; Take 2000mL and put it into the plugging simulation device (the plugging module uses a 0.5mm crack template), pressurize slowly with nitrogen, pressurize to 7MPa, keep the pressure for 30min, and the pressure drop is...

Embodiment 2

[0029] The composition of the plugging agent: 3g of vermiculite; 5g of barium sulfate; 3g of brucite fiber; 1g of ethylene-propylene rubber.

[0030] Mix 3g of vermiculite, 5g of barium sulfate, 3g of brucite fiber and 1g of ethylene-propylene rubber to make a plugging agent. The volume-to-mass ratio (volume of oil-based drilling fluid: mass of plugging agent) is 100:3 Weigh the plugging agent, add it to the base slurry, and stir it on the mixer for 20 minutes to make a plugging slurry for later use. After measuring the six-speed plugging slurry with a six-speed rotary viscometer, take 500mL and pour it into the 20-40 mesh sand bed of the FA non-permeable filter loss meter, slowly pressurize to 0.7MPa, and stabilize the pressure for 30min, the filtrate immersion depth is 2.8cm ; Take 2000mL and add it to the plugging simulation device (the plugging module uses a 0.5mm crack template), pressurize slowly with nitrogen, pressurize to 7MPa, keep the pressure for 30min, and the pre...

Embodiment 3

[0032] The composition of the plugging agent: mica 5g; barium sulfate 6g; sepiolite fiber 4g; nitrile rubber 1.5g.

[0033] Mix 5g of mica, 6g of barium sulfate, 4g of sepiolite mineral fiber and 1.5g of nitrile rubber to make a plugging agent. According to the volume-to-mass ratio (volume of oil-based drilling fluid: quality of plugging agent) 100: 3 Weigh the plugging agent, add it to the base slurry, and stir it on the mixer for 20 minutes to make a plugging slurry for later use. After measuring the six-speed plugging slurry with a six-speed rotary viscometer, take 500mL and pour it into the 20-40 mesh sand bed of the FA non-permeable filter loss meter, slowly pressurize to 0.7MPa, and stabilize the pressure for 30min, the filtrate immersion depth is 2.6cm ; Take 2000mL and add it to the plugging simulation device (the plugging module uses a 0.5mm crack template), pressurize slowly with nitrogen, pressurize to 7MPa, keep the pressure for 30min, and the pressure drop is 0.2M...

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Abstract

The invention discloses a drill-feeding plugging agent used for oil-based drilling fluid, a preparation method and an application thereof. The plugging agent comprises a sheet shape material with fineness less than 200 meshes, a granular material with fineness less than 200 meshes, a fibrous material with fineness less than 100 meshes, and an elastomeric material with fineness less than 100 mesh; wherein the weight ratio of the sheet shape material to the granular material to the fibrous material to the elastomeric material is (2-5): (4-8): (2-5): (0.5-3). The drill-feeding plugging agent can increase the plugging effect of a sand bed and small cracks. The drill-feeding plugging agent is added in the oil-based drilling fluid, in the sand bed with 20-40 meshes, the immersing depth of a filtrate is less than 3 cm, 0.5 mm of cracks are plugged, and the bearing capability is greater than 7 MPa.

Description

technical field [0001] The invention relates to the field of drilling plugging agents, and more specifically relates to a drilling-while-drilling plugging agent for oil-based drilling fluids, a preparation method and an application thereof. Background technique [0002] During the domestic shale gas well drilling construction, the drilling fluid used in the reservoir section is oil-based drilling fluid, and the cost of oil-based drilling fluid is relatively high, reaching about 10,000 yuan / m3. During the drilling process of oil-based drilling fluid, if the daily consumption is high, the drilling cost will be greatly increased. Therefore, it is necessary to add a certain amount of plugging material while drilling during the drilling process to seal small cracks and prevent oil-based drilling. Drilling fluid leakage reduces daily consumption of permeability. [0003] At present, there are few LWD materials specially used for oil-based drilling fluids at home and abroad. Most ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467C09K8/03C09K8/32
CPCC09K8/03C09K8/32C09K8/426C09K8/467C09K2208/08
Inventor 刘金华何恕刘四海李胜王显光张凤英陈曾伟李大奇林永学韩秀贞
Owner CHINA PETROLEUM & CHEM CORP
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