Fish bone type branch well drilling and completing method

A technology for branch wells, drilling and completion, which is applied in drilling equipment and methods, drilling equipment, earthwork drilling, etc., and can solve problems such as difficulties, limitations, and construction difficulties of guide and inclined bases.

Inactive Publication Date: 2006-12-27
LIAOHE GASOLINEEUM EXPLORATION BUREAU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will not only reduce the diameter of the small main wellbore during construction, but also bring difficulties to the construction. In addition, since the main wel

Method used

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  • Fish bone type branch well drilling and completing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Utilizing the present invention, in the process of horizontal sidetracking, the main wellbore 1 entering the horizontal well section from the vertical well section in the wellbore does not need to drill into the bottom of the well all the time when drilling into the oil layer, but uses a single-curved screw rod connected to the top of the drill pipe When the drilling tool (not shown in the figure) reaches the position of the first branch wellbore 2, the first branch wellbore 2 is directly drilled directional. Completion strings or direct open hole completion, and then replace the oil. After the above process is completed, because the completion string of the branch wellbore is thrown in the branch wellbore, it will not affect the main wellbore to continue drilling, and it can still continue Carry out the drilling of the main wellbore 1, when drilling into the position of the second branch wellbore 3, repeat the step of drilling the first branch wellbore, and then complet...

Embodiment 2

[0015] In addition to using the single-curved screw drilling tool for branching and drilling of fishbone branch wells described in Embodiment 1, the present invention can also use a detachable casing window opening guide tool for branch drilling when drilling fishbone branch wells. The method overcomes the disadvantage that the casing window opening guide device currently used in the oil field is not fishable. In the current technology, when drilling the wellbore above the second branch of the branch well, the main wellbore needs to maintain a certain diameter, and it is often necessary to take out the inclined device to be windowed from the well, and then run it into the completion guide. , which is very inconvenient and will prolong the well completion period. The detachable casing window opening guide device is a double-layer detachable structure. The casing can be used as a guide for the completion pipe string. The construction process of this device can save a trip time, ...

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Abstract

The invention relates to a herringbone branch well drilling method, belonging to the side drilling horizontal well method, wherein said invention can improve the yield; and the invention comprises: first drilling the first branch well eye; then inserting the first branch well tube post; when the main well eye drills to the second branch position, drilling into the second branch well eye, until completing all branch well eyes, then drilling into the main well eye and inserting the complete well sleeve. The invention can avoid reducing the size of main well eye, while the branch well is the same as main well eye; and the number of drilled branch wells is not limited, to increase the oil yield.

Description

Technical field: [0001] The invention relates to a method for drilling and completing fishbone branch wells, which belongs to the method category of sidetracking horizontal wells. Background technique: [0002] After the oilfield entered into development, in order to increase the production of oil wells, expand the exposed area of ​​oil layers, and maximize the single-well productivity of oil wells, since the early 1980s, the drilling and completion methods of sidetracking, directional drilling, horizontal wells and branch wells have been widely used. Horizontal wells, especially fishbone branch wells, have become the leading technology of crude oil production technology in the world due to their high single-well production and low crude oil production cost. After the borehole, the sub-wellbore is sidetracked by running a deflector in the casing of the main wellbore to sidetrack the window. This will not only reduce the diameter of the small main wellbore during constructio...

Claims

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Application Information

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IPC IPC(8): E21B15/04E21B7/20
Inventor 杨力强薄珉喻晨李敏周大胜吴兴国由世江王强尚宪飞苏涛朱太辉张海张春雷王宏远张世军
Owner LIAOHE GASOLINEEUM EXPLORATION BUREAU
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