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Fish bone type branch well drilling and completing method

A branch well, drilling and completion technology, applied in drilling equipment and methods, drilling equipment, earth-moving drilling and mining, etc., can solve problems such as difficulty of guide and inclined seat, construction difficulty, limitation and the like

Inactive Publication Date: 2009-10-14
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 wellbore is a horizontal well, it is also very difficult to carry out deflection seat hanging. Therefore, when this method is operated, it is subject to very restrictive

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  • Fish bone type branch well drilling and completing method

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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 pipe string or open hole completion directly, and then replace the drilling fluid. After the above process is completed, because the completion pipe 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 be completed. Continue to drill the main borehole 1. When drilling into the second branch wellbore 3 position, repeat the steps of drilling the first branch wellbore to c...

Embodiment 2

[0015] In addition to the single-curved screw drilling tool described in Embodiment 1 for drilling branched fishbone wells, the present invention can also use a detachable casing window opening guide tool for branched drilling when drilling fishbone branched 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, and a utility mod...

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Abstract

The invention relates to a method for drilling and completing fishbone branch wells, which belongs to the category of sidetracking horizontal well drilling methods. Because fishbone branch wells can increase the single well production of oil wells, at present, after the main wellbore is drilled, a deflector is lowered into the casing of the main wellbore to open a window to sidetrack the branch wellbore, which will reduce the diameter of the main wellbore. It is difficult to mount the deflector. For this reason, the present invention adopts that when the main borehole encounters an oil layer, the first branch borehole is first drilled. After drilling, the first branch completion string is lowered to replace the oil. When drilling to the second branch position, drill the second branch hole until all the branch holes are completed and then drill the main wellbore and run the completion casing. This method will not reduce the size of the main wellbore The branch wells can be the same size as the main wellbore, and the number of branch wells drilled is not limited, which can effectively increase the exposed area of ​​oil layers in a single oil well and increase crude oil production. This method is simple in construction and can be widely used in branch well drilling of sidetracked horizontal wells.

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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Patent Type & Authority Patents(China)
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