Drilling device and drilling method

A drilling and drilling fluid technology, applied in the field of petroleum exploration and development, can solve the problems of restricting the large-scale popularization and application of deep strata, short working life of a jet booster device, poor technical application effect, etc., so as to reduce heat exchange and improve heat exchange. Efficiency, effect of reducing trip and trip time

Active Publication Date: 2021-03-16
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional high-pressure water jet rock-breaking threshold pressure is high, and the technical application effect is poor
Although the addition of a downhole jet booster device can improve the rock-breaking effect of water jets, the short working life of the jet booster device limits the large-scale application of this technology in deep formations.

Method used

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  • Drilling device and drilling method
  • Drilling device and drilling method
  • Drilling device and drilling method

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Embodiment Construction

[0038] The present invention will be further described below in conjunction with accompanying drawing.

[0039] The method of thermal rock breaking refers to the use of thermal fluid, radiation flow, particle flow, flame, etc. to generate high temperature and act on the rock surface. Rapid heat transfer inside the rock generates non-uniform stress, and then forms a large number of micro-cracks, eventually leading to rock fragmentation. Research by Potter et al. showed that compared with conventional rock breaking methods, thermal rock breaking methods can save drilling costs better. And the deeper the well, the more cost savings and better economic benefits. This shows that it is more efficient to use the temperature effect to break rocks.

[0040] When the low-temperature fluid contacts the high-temperature rock of the reservoir, the surface temperature of the rock will drop sharply, and the internal particles will shrink to generate tensile stress; when the high-temperature...

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Abstract

The invention provides a drilling device. The drilling device comprises a coiled tubing, a drill bit and a temperature control assembly arranged between the coiled tubing and the drill bit; the temperature control assembly is used for carrying out periodic microwave heating on drilling fluid flowing to the drill bit; and the temperature control assembly is further used for cooling the drilling fluid flowing to the drill bit so alternate cold and hot drilling fluid is provided for the drill bit. According to the drilling device, alternate cold and hot jet flow acts on rock at the bottom of a well, the rock is subjected to fatigue failure under the action of the alternate cold and hot drilling fluid, and broken rock debris is separated from a rock body under the action of alternating load far lower than the tensile / compressive strength of the rock, so that the drill bit is assisted to efficiently break the rock.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration and development, and more specifically, to a drilling device and a drilling method. Background technique [0002] At present, most oilfields in eastern my country have entered the middle and late stages of development, with water cuts as high as 98%, facing the problems of weak production and stable production. However, the potential of oil and gas resources in the west is huge, and the remaining oil and gas resources in superimposed basins account for more than 40% of the total remaining oil and gas in the country. Although the potential of oil and gas resources in the west is huge, about 79% of the oil and gas resources in the western basin are buried in formations deeper than 4,500 meters. The problems of slowness, low efficiency and high cost have greatly restricted the efficient exploration and development of oil and gas resources in western my country. [0003] High-pressure w...

Claims

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Application Information

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IPC IPC(8): E21B7/14E21B7/15E21B7/18E21B36/00
CPCE21B7/14E21B7/15E21B7/18E21B36/001
Inventor 耿黎东蒋海军思娜叶海超光新军
Owner CHINA PETROLEUM & CHEM CORP
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