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Pipe String and Completion Methods

A technology of tubing strings and tubing, applied in the field of oilfield development, can solve problems such as low work efficiency

Active Publication Date: 2019-02-15
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a pipe string and a well completion method to overcome the work efficiency caused by the three functions of acid fracturing or acidizing transformation, self-flowing well completion and sand control in the prior art well completion operation, which requires three trips of drilling low defect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] figure 1 It is a schematic structural diagram of a pipe string provided by an embodiment of the present invention. Refer to attached figure 1 As shown, this embodiment provides a pipe string, and the pipe string in this embodiment is mainly used in gushing wells.

[0046] The tubing string includes: a first tubing 1 , a packer 2 , a second tubing 3 , and a sand control device 4 arranged in sequence from top to bottom.

[0047] Specifically, the top end of the first oil pipe 1 is located at the wellhead, and the bottom end of the first oil pipe 1 communicates with the top end of the packer 2 . That is, the first oil pipe 1 is vertically arranged in the well. The bottom end of the packer 2 communicates with the top end of the second oil pipe 3 . It can be understood that: the packer 2 is a hollow structure, and the open end at the top of the hollow structure matches the bottom opening of the first oil pipe 1, so that the hollow structure communicates with the inside o...

Embodiment 2

[0073] figure 2 It is a schematic flowchart of a well completion method provided by an embodiment of the present invention. Refer to attached figure 2 As shown, this embodiment provides a well completion method, which is realized by using the pipe string provided in Embodiment 1.

[0074] A well completion method comprising:

[0075] S101. Run the pipe string into the well-killing state of the flowing well.

[0076] Specifically, the killing state refers to injecting dense mud into the well to equal or slightly higher than the pore pressure of the formation, so as to suppress the energy of the formation so that it cannot self-spray.

[0077] Run the pipe string into the well so that the sand control device is located at the designed well depth, that is, the sand control device is located in the oil layer.

[0078] S102. Release the kill state.

[0079] Specifically, after the pipe string is run in, the annulus protection fluid with low density is injected into the annul...

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Abstract

The invention provides a string and a well completion method; the string includes a first tube, a packer, a second tube, and a sand preventer arranged sequentially from top to bottom; the bottom end of the first tube is communicated with the top end of the packer; the bottom end of the packer is communicated with the top end of the second tube; the sand preventer includes a sand prevention tube, a sand settling tube and a pressure control switch valve connected sequentially from top to bottom; the top end of the sand prevention tube is communicated with the bottom end of the second tube, the bottom end of the sand prevention tube is communicated with the top end of the sand settling tube, and the side wall of the sand prevention tube is provided with a plurality of through holes admitting oi land gas; the pressure control switch valve is arranged at the bottom of the sand settling tube and may be opened or closed under the action of fluid pressure in the tubing. The functions of acid fracturing or acidifying modification, flowing well completion and sand prevention can be achieved just through the trip-in of the string, operating time is shortened, and working efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a pipe string and a well completion method. Background technique [0002] In the process of oil field development, well completion operations are required. Among them, well completion operations are not only the last process of drilling operations, but also the beginning of oil production operations. Well completion operations play an important role in connecting drilling operations and oil production operations. In the process of well completion, acid fracturing or acidizing technology is usually required to increase the permeability of the formation, so as to achieve the purpose of self-flowing oil and gas wells and increase oil and gas production. In oil recovery operations, the formation of the self-flowing well has the energy to lift oil and gas from the oil and gas layer to the wellhead. In addition, many formations also produce sand while producing oil, so the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B17/00E21B33/12E21B43/08E21B43/27E21B43/00
CPCE21B17/00E21B33/12E21B43/00E21B43/08E21B43/088E21B43/26
Inventor 周建平张雪松李元斌季晓红练以峰张浩
Owner PETROCHINA CO LTD
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