Large curvature radiation horizontal well drilling technique and device

A horizontal well and large curvature technology, applied in drilling equipment, directional drilling, earthwork drilling and production, etc., can solve the problems of high investment and low efficiency, and achieve the goal of increasing daily production, improving recovery, and reducing artificial blockage and restrictions Effect

Inactive Publication Date: 2008-07-02
杜晓瑞
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The purpose of the present invention is to provide a large-curvature radiation horizontal well drilling process and device to solve the problems of high investment and low efficiency in the prior art

Method used

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  • Large curvature radiation horizontal well drilling technique and device
  • Large curvature radiation horizontal well drilling technique and device
  • Large curvature radiation horizontal well drilling technique and device

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Experimental program
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Embodiment Construction

[0046] See figure 1 ~ Figure 8, the specific scheme and steps of the present invention are as follows:

[0047] (1) Drilling a vertical well to the oil layer: newly designed well position, drill a vertical well A into oil layer C according to the conventional method.

[0048] (2) Run casing: run casing 9 in vertical well A, and its lower end is 20 meters ± 2 meters from the top of thin oil layer C; for thick oil layers, casing 9 can be lowered to the top of oil layer C.

[0049] (3) Drilling out casing shoes: the next example figure 1 The reaming drill bit shown in -0 drills the casing shoe (enlarged wellbore) 6, and expands the borehole diameter of the 215 mm vertical well A to 600-1000 mm, and the footage is 3-4 meters (that is, the casing is formed). The length of the shoe 6).

[0050] (4). Directional build-up: run down the build-up tool and drill out such as figure 1 The radial well B (including the curved transition section) shown in the marks 1 to 5, the tilting tool inc...

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Abstract

The invention discloses a large-curvature radioactive level horizontal drilling process and device includes drilling vertical well to oil layer, lowering the sleeve, drilling sleeve shoe, building up angle directionally, washing well, lifting the drill, lowering special sieve vessels, filling with gravels, decoupling the hanger for circulated well washing, lifting the hanger de-coupler and all drilling tools above, drilling other radial wells, etc. Through drilling a plurality of radial wells, the invention enlarges seepage area, expanding seepage range, increasing the daily production for single well and raises final recovery ratio, so as to achieve the purposes of making full use of energy, increasing economic benefits and benefiting the society.

Description

Technical field [0001] The invention relates to a drilling technology and device for a large-curvature radiation horizontal well, which is mainly used for oil and natural gas drilling and development projects. Background technique [0002] At present, there are many existing horizontal well methods in the world. They have their own characteristics and have different needs for oil exploration and development, but they have their own shortcomings. For example: Many horizontal wells with small curvature and long radius are currently used. Because of the slow deflection, a well section of several hundred meters is required to convert the wellbore from vertical to horizontal. This wastes a lot of footage and requires constant adjustment of the well trajectory, which is time-consuming. It is labor intensive and costly. For radial wells with large curvature horizontal wells and rapid deflection rate, horizontal wells can be drilled within 30 cm distance, but it requires special special ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/04E21B7/08
Inventor 杜晓瑞
Owner 杜晓瑞
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