Method for drilling horizontal well with super-short radius

An ultra-short-radius, horizontal well technology, applied in liquid/gas jet drilling, directional drilling, wellbore/well components, etc., can solve the problem of limited energy of the jet drill bit, and improve single well production and recovery, Improve the permeability and porosity, which is beneficial to the effect of carrying rock

Active Publication Date: 2012-05-30
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Abstract
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Problems solved by technology

After the drilling fluid pressure is lost along the coiled tubing and flexible

Method used

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  • Method for drilling horizontal well with super-short radius
  • Method for drilling horizontal well with super-short radius
  • Method for drilling horizontal well with super-short radius

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Using supercritical CO 2 Fluid-assisted coiled tubing is used to drill ultra-short radius horizontal wells in Mancos shale, and compared with water fluid drilling in Mancos shale, the conditions are shown in Table 1:

[0045] Table 1 Threshold pressure of jet rock breaking

[0046]

[0047] Image 6 It is a comparison result diagram of jet drilling using drilling equipment with a power of 100kw and a diameter of 50mm. The results show that using supercritical CO in the Mancos shale 2 It is 3.3 times the drilling speed of water, and the specific energy SE required for rock breaking (the specific energy SE is the ratio of hydraulic and mechanical energy required for rock breaking to the volume of broken and peeled rock) is only 20% of that of hydraulic drilling. When the pressure is lower than 124MPa, the water jet cannot break the rock, and the supercritical CO 2 The effective pressure of jet rock breaking is as low as 55MPa.

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Abstract

The invention provides a method for drilling a horizontal well with super-short radius, and the method is implemented by taking supercritical CO2 fluid as drilling fluid, and combining the supercritical CO2 fluid with a continuous oil pipe to carry out well drilling. In the invention, the supercritical CO2 fluid is introduced for assisting the continuous oil pipe in performing an action of drilling the horizontal well with super-short radius, so that the respective advantages of the supercritical CO2 fluid and the continuous oil pipe can be fully played.

Description

technical field [0001] The invention relates to a drilling method, in particular to a drilling method for ultra-short radius horizontal wells. Background technique [0002] Ultra-short-radius radial horizontal well technology was first proposed in the 1980s. At that time, it was mainly used in the reconstruction of old wells to enhance oil recovery. At present, ultra-short-radius radial horizontal wells have been widely used in new wells to improve single well production and recovery. Yield has become one of the important means of well pattern optimization. This technology is proposed on the basis of coiled tubing technology. Equipped with special key drilling tools (mainly including jet drill bit, trajectory control device, reamer and steering gear, etc.), it can drill the reservoir section of the main wellbore, The technique of drilling a layer to multi-layer radially branched tiny wellbore. At the beginning of this century, researchers proposed the use of more flexible ...

Claims

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Application Information

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IPC IPC(8): E21B7/04E21B7/18E21B21/00E21B10/61
Inventor LI GENSHENGWANG HAIZHUSHEN ZHONGHOUHUANG ZHONGWEITIAN SHOUZHENGSHI HUAIZHONGSONG XIANZHI
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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