Unidiameter well drilling and completing method

A technology of equal diameter, drilling and completion, applied in drilling equipment and methods, drilling equipment, earthwork drilling, etc., can solve the problems of complex construction process and high construction cost, and achieve the effect of simple construction process and low construction cost

Inactive Publication Date: 2011-05-18
CNPC GREATWALL DRILLING ENG
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It overcomes the shortcomings of the existing diameter drilling and completion technology, which are complex in construction technology and high in construction cost

Method used

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  • Unidiameter well drilling and completing method

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Embodiment Construction

[0008] As shown in the attached figure, it is a drilling and completion method with equal diameter. After the surface casing 1 is run, the wellbore is drilled with a suitable drill bit. down into the expansion tube 2, expand the expansion tube 2 by mechanical or other methods, so that the inner diameter of the expansion tube 2 is as large as the hole drilled by the original drill bit, and then drill with the original size drill bit until the next one that needs to be sealed is encountered. For the well section, repeat the above steps until all the wells are drilled, and run a completion casing 3 of an appropriate size in the wellbore to achieve equal-diameter completion.

[0009] The expansion pipe 2 used in the present invention does not have high requirements on strength and less consumption. The cost of the same well is far lower than that of the existing diameter drilling and completion method, and the construction difficulty is greatly reduced.

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Abstract

The invention relates to the field of a unidiameter well drilling and completing technology for an oil (water) well, in particular to a unidiameter well drilling and completing method. The method comprises the following steps of: after a surface casing (1) is placed, drilling a well borehole with a proper drill; when a well section to be sealed and separated is drilled to, chambering at the well section, placing an expansion pipe (2), and expanding the expansion pipe (2) mechanically or with other methods so that the inner diameter of the expansion pipe (2) is as big as the well borehole drilled by the original drill; drilling with the drill with the same size till a next well section to be sealed and separated is reached; repeating the steps till the whole well is drilled; and placing a well completion sleeve (3) with proper size in a mineshaft to realize unidiameter well completion. The method realizes the unidiameter well drilling and completing, has a simple construction process and a low construction cost, overcomes the defects such as complicated construction process and high construction cost of the traditional diameter well drilling and completing technology.

Description

Technical field: [0001] The invention relates to the technical field of equal-diameter drilling and completion of oil (water) wells, in particular to a method for equal-diameter drilling and completion. Background technique: [0002] At present, the diameter drilling and completion technology is mainly used to drill the wellbore with a suitable drill bit after the surface casing is run, and when the well section that needs to be isolated is drilled, the first-level technical casing is inserted to complete the well, and the casing is run down to the Wellhead; then lower the drill bit into the lower level for drilling. When drilling into the next well section that needs to be isolated, first ream the well section to make it reach the size of the upper wellbore, and then run the expandable The second-level technical casing (the outer diameter of the second-level technical casing is smaller than the inner diameter of the first-level technical casing), which is expanded to be con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/00E21B7/20E21B7/28
Inventor 余雷李敏张馨予孙继光胡素芹
Owner CNPC GREATWALL DRILLING ENG
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