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Completion technology method for sidetracked well

A side drilling and drill pipe technology, which is applied in the field of oil and gas field exploration and development, can solve the problems of water-blocking oil production, casing damage on the upper part of the opening point, etc., and achieve the effect of improving the pressure bearing capacity.

Active Publication Date: 2020-07-31
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a sidetracking well completion process to solve the multi-stage fracturing construction of the sidetracking well under cementing and completion conditions and the problem of water isolation and oil production if the upper casing at the window opening point is damaged in the later production process

Method used

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  • Completion technology method for sidetracked well
  • Completion technology method for sidetracked well
  • Completion technology method for sidetracked well

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0038] The first embodiment of the present invention relates to a sidetracking well completion method, such as Figure 1-Figure 5 shown, including the following steps:

[0039] S1. Connect the drill pipe 5, the liner suspension and tie-back integrated tool 4, and the small-diameter casing 3 sequentially from top to bottom, and lower them into the sidetracking wellbore 2;

[0040] S2, injecting cement 6 through the drill pipe 5 to carry out the cementing operation, and pulling out the drill pipe 5 after the cementing operation is completed;

[0041] S3, carry out the well flushing operation;

[0042] S4. Connect the sealing cannula 7 with the tie-back casing 8 and lower it into the wellbore, and insert the sealing cannula 7 into the tie-back barrel 4.3 reserved after the liner suspension and tie-back integrated tool 4 is discarded, and carry out Staged fracturing construction.

[0043] In the present invention, an integrated tool for liner suspension and tie-back is installe...

no. 2 approach

[0045] On the basis of the above-mentioned embodiments, such as Figure 7 As shown, the tailpipe suspension and tie-back integrated tool 4 includes a central pipe 4.4, the two ends of the central pipe 4.4 are respectively connected with an upper joint 4.1 and a lower joint 4.9, and the outside of the central pipe 4.4 is from top to bottom Tie-back barrel 4.3, rubber barrel 4.5, liquid cylinder 4.6, vertebral body 4.7 and slips 4.8 are set sequentially. The outer lower end of 4.1 is connected; between the liquid cylinder 4.6 and the central tube 4.4, there is an upper piston for pushing the rubber cylinder 4.5 to move, and between the liquid cylinder 4.6 and the central tube 4.4, there is also a lower piston for pushing the vertebral body 4.7 to move. There is a gap between the upper piston and the lower piston, and the central pipe 4.4 is provided with a pressure transmission hole at the gap.

[0046] Further, the lower part of the upper joint 4.1 is provided with a locking p...

no. 3 approach

[0050] This embodiment provides a sidetracking well completion method, such as Figure 1-Figure 6 shown, including the following steps:

[0051] S1, refer to figure 1 After connecting the drill pipe 5, the integrated tool for tailpipe suspension and tie-back 4, and the small-diameter casing 3 (diameter 88.9-114.3cm) from top to bottom in sequence, run them into the side drilled on the inside of the original well casing 1. Drill in the wellbore 2, and make the liner suspension and tie-back integrated tool 4 above the window opening point;

[0052] S2. Calculate the amount of cement needed for cementing according to the size of the outer annular space of the small-diameter casing 3, inject cement from the drill pipe 5, and after the cement injection is completed, put a cementing plug into the wellhead and continue to inject active water. When the plug is pumped to the bottom of the artificial well by liquid, the cement has filled the outer annular space of the small-diameter c...

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Abstract

The invention provides a completion technology method for a sidetracked well. A tail pipe suspension and tie-back integrated tool is installed on the upper portion of a small-diameter casing pipe, well cementation of the small-diameter casing pipe in an original well bore is completed, and a tie-back barrel is reserved on the upper portion of the small-diameter casing pipe after suspension. Duringfracturing construction, a sealing insertion pipe and the small-diameter casing pipe can be connected and put into the sidetracked well, the sealing insertion pipe is inserted into the tie-back barrel to form a shaft similar to a new well, the full bore of the shaft of the sidetracked well is achieved, the pressure bearing capacity of the whole shaft is improved, and conditions are created for achieving multi-layer and section transformation and water-resisting oil extraction of a subsequent reservoir.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field exploration and development, and relates to a sidetracking well completion method. Background technique [0002] The sidetracking technology refers to opening a window in a certain place of the casing in the old wellbore, and sidetracking a certain distance to form a new well completion, so that the oil well can resume production and re-form the development capability. Sidetracking wells are designed and constructed on the basis of a full understanding of the original production reservoirs, and have the characteristics of strong targeting, low risk, short cycle, quick results, and low cost. An important technical means of yield. [0003] At present, due to the limitation of wellbore conditions, sidetracking wells are mostly completed in the open hole. After the completion of the liner suspension cementing wellbore, due to the problems of the wellbore diameter change at the hanger and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/20E21B33/13E21B43/26E21B23/01E21B23/08E21B43/00
CPCE21B7/20E21B33/13E21B43/26E21B43/261E21B23/01E21B23/08E21B43/121
Inventor 蒙鑫任勇王治国赵粉霞刘忠能冯长青齐银郭超郭瑞安
Owner PETROCHINA CO LTD
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