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Underbalance well completion method and apparatus

An underbalanced, wellbore technology, applied in underbalanced well completion devices, well completion methods and devices used, and underbalanced well completion fields, can solve the problems that the purpose of protecting oil and gas layers has not been finally realized, and the protection of oil and gas layers cannot be realized. , to save perforation costs, increase single well production, and overcome damage

Inactive Publication Date: 2007-01-10
SCI & TECH RES INST LTD PETRO CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem that the current well completion technology cannot realize the protection of oil and gas layers, and the purpose of protecting oil and gas layers in underbalanced drilling technology has not been finally realized, the underbalanced well completion technology is proposed

Method used

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  • Underbalance well completion method and apparatus
  • Underbalance well completion method and apparatus
  • Underbalance well completion method and apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Site conditions: The underbalanced drilling has just been completed, and the drilling equipment, derrick, drilling rig, blowout preventer, snubbing device, and expander have passed the inspection. The drilling fluid used in underbalanced drilling has good properties. The diameter of the open-hole wellbore for underbalanced completion construction is 149 mm, the thickness of oil and gas layers is 180 meters, and the depth is 2,300 meters.

[0037] See attached figure 2 . Firstly, under the under-balanced condition, the drilling rig is used to put the expansion pipe string with the lower end closed into the wellbore. The composition of the expansion pipe string: from bottom to top, there is a sealed pipe head (9), 20 well completion devices for underbalanced well completion and a liner hanger. The well completion device used for underbalanced well completion adopts the above-mentioned device embodiment. 20 circular pipes (2) are formed by connecting each other with l...

Embodiment 2

[0043] It is basically the same as the completion method Example 1, the difference is: after the circular pipe (2) expands, the well completion device for underbalanced well completion is closely attached to the well wall (7) of the wellbore. See image 3 .

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Abstract

The invention discloses an underbanlanced well completion method and device. And the device is like a round tube, where the two ends of the round tube are equipped with screwed connection segments, the middle of the round tube wall is provided with several axial grooves, and the device produces plastic deformation by underground expansion tool and clings to the well wall; besides, the expansion of the tube wall makes the middle axial grooves become through holes so as to make the inside and outside of the tube connected, thus playing a role of filter sieve tube. During construction, it need not fix the well with cement, therefore it can make well fixing operation on underblanced condition, putting column in and piercing reservoir. And the device is an underbalanced well completion device applied to various geological conditions, achieving the purposes of scientifically completing well, protecting reservoir and raising output of oil and gas.

Description

Technical field: [0001] The invention relates to the technical field of oil and gas well drilling and well completion, and relates to a well completion method and a used device. In particular, it relates to an underbalanced well completion method and an underbalanced well completion device used in the method. Background technique [0002] In the exploration and development of oil and gas fields, conventional drilling techniques are all overbalanced drilling, which means that the pressure of the drilling fluid in the well is higher than the pore pressure of the reservoir during the drilling process, especially when the reservoir is opened, to prevent blowout. In the conventional overbalanced drilling technology, because the pressure of the drilling fluid at the bottom of the hole is higher than the pore pressure of the formation, the drilling fluid enters the reservoir under the action of the pressure difference, and blocks, damages and pollutes the reservoir. Reservoir pore...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13E21B7/00
Inventor 谢正凯吴仕荣陈刚伍贤柱王忠生王玉明
Owner SCI & TECH RES INST LTD PETRO CHINA
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