Well drilling method of multibranch well

A multi-branched and new technology, applied in wellbore/well components, directional drilling, earth-moving drilling, etc., can solve the problems of unreliable positioning, small main wellbore, can not find, etc., to achieve high operational safety and reliability, construction The effect of obvious signal and low operation difficulty

Inactive Publication Date: 2007-04-18
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Application Information

AI Technical Summary

Problems solved by technology

Most of the multi-lateral wells completed with casing for development in foreign countries are constructed in casings with a size above 95/8″, and the main wellbore is large; however, most of the casings produced in China are 7″, 51/2″ or 5″, and the main wellbore Small, using conventional whipstock technology to drill multi-lateral wells not only limits the number of branches to be drilled, but also makes tool design and construction more difficult
[0005] In addition, conventi

Method used

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  • Well drilling method of multibranch well
  • Well drilling method of multibranch well
  • Well drilling method of multibranch well

Examples

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Embodiment 1

[0038] Example 1: Method for a new multilateral well.

[0039] As shown in Figure 1, it is a positioning device 1 for drilling a multilateral well, which is a permanent positioning device: the positioning device is designed with a sealing part 2 to separate the upper wellbore from the lower wellbore of the main wellbore window; , the diameter of the main wellbore is only reduced by one annular wall thickness of the positioning device 1 .

[0040] As shown in Figure 2, it is for going into the permanent positioning device 1 operation. Run and seal a permanent positioning device 1 at the window opening position of the main wellbore, so as to separate the upper part and the lower part of the window opening position of the main wellbore. The positioning device 1 is connected with the downhole pressing tool 3 through the drill pipe 4 and the pressing equipment at the wellhead. After pressing, the positioning device 1 shown in FIG. On the inner wall of the casing 5, the requiremen...

Embodiment 2

[0049] Embodiment 2: Well sidetracking branch well method.

[0050] When the oil (gas) field is in the production process, due to various reasons, it is necessary to drill a new wellbore and complete the well, so that the oil (gas) and water wells can resume production and achieve normal production. It is necessary to seal a permanent positioning device 1 in the depth of the branch well, carry out the operation of positioning device, the operation of the inclined device, the drilling tool for directional window opening, directional drilling, casing cementing and completion Such as conventional construction operations, recovery inclined device operations.

[0051] Since the positioning device 1 is designed with a sealing member 2 separated from the lower part, the upper part and the lower part of the window opening position of the main wellbore are sealed off. Therefore, after the above operations are completed, if it is necessary to seal off the lower wellbore, it is not nece...

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Abstract

A new multi-branch well drilling and completion method relating to oil and geological exploration is that enters and seals a permanent positioning device 1 in the main well eye; so that the upper eye of the main well window is separated from the down well eye; After the positioning, it makes the oblique machine 6 after adjusting the tool angle on the ground is put into the main well eye, and is hang on the positioning device1. The conventional tool is put into the well to do the directionally opening window, drilling the well and putting the sleeve to fix the well and completing well. After drilling, the cowl milling machine 10 reclaims the overlapping segment of the tail pipe of the main well holes and the oblique machine 6. Repeating above steps, so it drills several horizontal branch well holes or directed branch well holes in the same main well hole, so it realizes the reliable positioning of the oblique machine. It can bear large drilling pressure and drilling torque, so it fully satisfies the opening windows, lateral drilling, milling, cowl milling and other construction sets; and it makes the main well diameter largest so that the oil production, ribbing well and oil layer reforming can perform normally. It can drill several branches in the same main well shaft and the number of branch well is not limited.

Description

Technical field: [0001] The invention relates to a novel multi-branch well drilling and completion method for petroleum and geological exploration. Background technique: [0002] A multilateral well is a well in which several wellbores are drilled at different depths in a main wellbore to exploit oil layers at different depths. The branch well technology can increase the drainage area, improve the production of oil wells, and reduce the cost of reservoir development in an all-round way. The present invention relates to a new type of drilling and completion method for multi-branch wells and its equipment. Well method. [0003] Multilateral well technology is a new drilling technology developed after directional well, sidetracking well and horizontal well technology. Different from ordinary vertical wells and directional wells, multi-branch wells drill several different branches in one main wellbore, which increases the drainage area, which is equivalent to increasing the n...

Claims

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Application Information

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IPC IPC(8): E21B7/04E21B23/00E21B29/00
Inventor 陈健任荣权徐长安张燕萍
Owner BC P INC CHINA NAT PETROLEUM CORP
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