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Marine fracture zone stratum water-based drilling fluid system as well as preparation method and application thereof

A technology of broken zone and formation water, applied in the field of oil drilling, can solve the problems of complex downhole and instability of the wellbore, shorten the drilling cycle, prevent the drilling tool from jamming, and meet the needs of safe drilling.

Pending Publication Date: 2022-05-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems existing in the prior art that the wellbore wall is prone to instability after drilling into the marine fractured zone formation during the above-mentioned drilling process, causing downhole complex problems, the present invention proposes a water-based drilling fluid system for the marine fractured zone formation

Method used

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  • Marine fracture zone stratum water-based drilling fluid system as well as preparation method and application thereof
  • Marine fracture zone stratum water-based drilling fluid system as well as preparation method and application thereof
  • Marine fracture zone stratum water-based drilling fluid system as well as preparation method and application thereof

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preparation example Construction

[0066] The preparation method of high temperature resistant stripping agent refers to the preparation method of stripping agent in Chinese patent cn110066644a, which can specifically include the following steps: add 20g attapulgite and 0.3grh570 to 100ml distilled water, stir at a speed of 300 rpm, stir for 30 minutes, add 2G 2-acrylamide-2-methylpropanesulfonic acid in the stirring state, adjust the pH value to 6 ~ 7 with sodium hydroxide, and then add 0.02g ammonium persulfate and 0.02g sodium bisulfite, The heating temperature is 60 ℃, the stirring speed is maintained for 4 hours, and the resulting mixture is dried and crushed to obtain high temperature resistant cutting agent products for standby.

[0067] Other raw materials are commercially available.

Embodiment 1

[0069] The components of the marine fracture zone formation water-based drilling fluid provided in this embodiment include 400g fresh water, 24g bentonite, 2G sodium carbonate, 2G caustic soda, 12g lignite resin, 12g sulfonated phenolic resin, 2G polyanionic cellulose fluid loss reducer, 8g sulfonated asphalt, 8g (2000 mesh) ultra-fine calcium carbonate, 4G (1250 mesh) ultra-fine calcium carbonate, 4G (800 mesh) ultra-fine calcium carbonate 8g non permeable plugging agent (cotton fiber powder: wood fiber powder: mineral fiber mixed by weight ratio of 3:5:2), 1.2g hydrolyzed polyacrylamide, 12g high temperature resistant cutting agent and 280g barite. The preparation method of the marine fracture zone formation water-based drilling fluid comprises the following steps:

[0070] (1) Base slurry configuration: add bentonite, sodium carbonate and caustic soda into fresh water, mix with a high-speed mixer at 8000-10000 speed for 1h, and then static pre hydration for 24h.

[0071] (2) Ad...

Embodiment 2

[0107] The components of the water-based drilling fluid provided in this embodiment include 400g fresh water, 24g bentonite, 2G sodium carbonate, 2G caustic soda, 16g lignite resin, 16g sulfonated phenolic resin, 4G polyanionic cellulose fluid loss reducer, 12g sulfonated asphalt, 8g (2000 mesh) ultra-fine calcium carbonate, 4G (1250 mesh) ultra-fine calcium carbonate, 4G (800 mesh) ultra-fine calcium carbonate, 12g impermeable plugging agent, 2G hydrolyzed polyacrylamide, 20g high temperature resistant cutting agent 280g barite.

[0108] The preparation method of the marine fracture zone formation water-based drilling fluid comprises the following steps:

[0109] (1) Base slurry configuration: add bentonite, sodium carbonate and caustic soda into fresh water, mix with a high-speed mixer at 8000-10000 speed for 1h, and then static pre hydration for 24h.

[0110] (2) Add temperature resistant fluid loss reducer: successively add lignite resin, sulfonated phenolic resin, polyanionic...

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Abstract

The invention relates to a marine fracture zone stratum water-based drilling fluid system and a preparation method and application thereof in the field of oil drilling. The marine fracture zone stratum water-based drilling fluid system is prepared from the following components in parts by weight: 1000 parts of water, 50-80 parts of bentonite, 1-5 parts of a macromolecular treating agent, 60-120 parts of a temperature-resistant fluid loss agent and 20-50 parts of a flow pattern regulator. The method mainly aims at the characteristic that the well wall of the marine fracture zone stratum is collapsed, falling blocks generated after the marine fracture zone stratum is drilled are carried away from a near-drill-bit area in time so as to achieve the purpose of well hole cleaning, rock debris or the falling blocks in an irregular well hole section in a shaft are effectively removed, the drill bit and a well bottom drilling tool are prevented from being clamped, and the drill jamming accident is avoided; and meanwhile, temperature resistance and plugging are considered, the system is kept stable under the high-temperature condition of a deep well, the safe drilling requirement is met, the drilling period is shortened, and the comprehensive drilling cost is reduced.

Description

technical field [0001] The invention relates to the field of oil drilling, and further relates to a water-based drilling fluid system for marine fracture zone formation and a preparation method and application thereof. Background technology [0002] In recent years, with the acceleration of the exploration and development process of deep marine strata in major domestic oilfields, there are more and more cases of drilling in broken zone strata in the drilling process. The traditional concept of "iron bucket" borehole also has frequent collapse and block falling, and drilling sticking accidents occur frequently. Because the well depth is more than 5000 meters, the accident treatment is not only time-consuming and laborious, but also caused huge economic losses. [0003] Marine strata fracture zone refers to the marine strata in which the non reservoir carbonate strata are affected by the compression movement under the geological tectonic movement, and the rocks are in the state of ...

Claims

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Application Information

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IPC IPC(8): C09K8/24C09K8/14
CPCC09K8/24C09K8/14
Inventor 陈晓飞甄剑武柴龙高书阳韩子轩张亚云
Owner CHINA PETROLEUM & CHEM CORP
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