Thin interlayer steam injection thermal production well mixing-proof well completion process

A thermal recovery well and interlayer technology, applied in wellbore/well components, production fluids, earthwork drilling, etc., can solve the problems of breaking the cement sheath, isolation failure, and prolonging the well construction period during perforation operations, and achieve economical Significant technical benefits, efficient and reliable isolation, and the effect of increasing construction risks

Inactive Publication Date: 2008-11-19
SHENGLI OILFIELD PETROLEUM DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Steam injection thermal recovery is easy to channel between layers
[0007] (2) The perforation operation will crush the cement sheath, making the isolation invalid and causing water channeling
[0008] (3) Although the ground anchor prestress can effectively prevent the expansion stress of the casing during steam injection thermal recovery, the completion process is complicated and the well construction period is extended by more than 3 days

Method used

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  • Thin interlayer steam injection thermal production well mixing-proof well completion process
  • Thin interlayer steam injection thermal production well mixing-proof well completion process
  • Thin interlayer steam injection thermal production well mixing-proof well completion process

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Embodiment Construction

[0029] combined with Figure 1-3 , to further describe the inventive method:

[0030] The completion string for the anti-channeling completion of the thin interlayer steam injection thermal production well is composed of the casing 1, the casing telescopic compensator 3, the special valve collar 5, the outer packer 6 and the cementing shoe 9; the casing telescopic The compensator, special valve hoop, outer pipe packer and cementing shoes are all connected in series by threads, and the casing, special valve hoop and outer pipe packer are connected by thread.

[0031] Among them, the upper end of the special valve hoop is connected to the casing through threads, and the lower end is connected to the outer pipe packer through threads; The flow channel 5.6 to the outer packer cavity, the cavity 5.7 and the piston cylinder 5.9 are composed of the flow channel, the cavity and the piston cylinder leading to the outer packer cavity in the outer shell, which lead to the tube A one-wa...

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Abstract

The invention relates to a method for completing a thin interlayer steam-injection thermal-recovery well in petroleum engineering. The invention adopts the technical proposal that the method comprises the steps as follows: 1) a particular valve hoop is assembled with an external casing packer, and lengths and positions of tools arranged on a well completion string according to the oil well geologic condition after the drilling is completed; 2) a cementing truck is connected with a cementing head for cementing; 3) a bumping rubber plug is displaced to the position of a cementing shoe for bumping; 4) an inner cavity of a casing is decompressed, so that cement paste in a borehole can enter a cavity body through a one-way valve to drive a piston to compress a piston cylinder; pressure of the inner cavity of the casing is boosted for a certain period to drive the piston to compress the cavity body, so that the cement paste in the cavity body enters a flow passage of the cavity body leading to the external casing packer through the one-way valve, thereby expanding and sealing the external casing packer; 5) the external casing packer is completely expanded and sealed to complete the construction through repeating the step 4. The method has the advantages that: the method realizes that the external casing packer is expanded and sealed by the cement paste in the borehole without changing the cementing process, increasing construction risk or increasing the construction period, and has prominent economic and technological benefits.

Description

1. Technical field: [0001] The invention relates to a well completion method for steam injection and thermal recovery wells with thin interlayers in petroleum engineering, in particular to a method for preventing channeling and completion of steam injection and thermal recovery wells with thin interlayers. 2. Background technology: [0002] combined with Figure 4 , 5 , the current general well completion measure for thermal steam injection wells is ground anchor prestressing-cementing and perforation. The process is realized as follows: [0003] 1. attached Figure 4 An anchor [a5] is connected in series at the bottom of the casing [a1]. First, the anchor is fixed with cement, and the upper cement slurry is circulated through the cementing hole [a3] to control the cement surface below the circulation hole [a3]. The cement stone [a4] of the cement slurry after the cement solidifies makes the entire casing string anchored in the wellbore. [0004] 2. attached Figure 5 Cem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/10E21B43/24
Inventor 张继国赵志勇李安夏张广卿张炜余金铃周向东刘文波
Owner SHENGLI OILFIELD PETROLEUM DEV CENT
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