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Pipe string and completion method

A pipe string and oil pipe technology, which is applied in the field of oilfield development, can solve problems such as low work efficiency, and achieve the effect of improving work efficiency and saving operation time.

Inactive Publication Date: 2017-06-09
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 need for three trips of drilling in the prior art well completion operation to realize the acid fracturing or acidizing transformation function, the mechanical recovery pumping completion function and the sand control function. low defect

Method used

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  • Pipe string and completion method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] figure 1 It is a schematic structural diagram of a fixed pipe string assembly in a pipe string provided by an embodiment of the present invention. figure 2 A schematic structural diagram of an oil well pump assembly in a pipe string provided by an embodiment of the present invention. Refer to attached figure 1 And attached figure 2 As shown, this embodiment provides a pipe string, which is mainly used for well completion and oil recovery operations in oil field development. The pipe string includes: a fixed pipe string assembly and an oil well pump assembly 7, wherein:

[0054] The fixed tubing string assembly includes: a first oil pipe 1 , a pump base 2 , a second oil pipe 3 , a packer 4 , a third oil pipe 5 and a sand control device 6 arranged in sequence from top to bottom.

[0055] 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 pump base 2 . The bott...

Embodiment 2

[0086] This embodiment provides a well completion method, which is completed by using the pipe string provided in the above embodiment.

[0087] image 3 For the schematic flow chart of the well completion method provided in this embodiment, refer to the attached image 3 As shown, a well completion method utilizing the above pipe string for well completion includes:

[0088] S101, run the fixed pipe string assembly into the well in the kill state.

[0089] Specifically, the killing state refers to the injection of 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.

[0090] S102. Release the kill state.

[0091] Specifically, after the fixed string assembly is lowered, the annulus protection fluid with low density is injected into the annulus area formed between the casing and tubing in the well to replace the high-density kill mud in the wellbore to complet...

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Abstract

The invention provides a pipe string and a completion method. The pipe string comprises a pipe string fixing component and an oil well pump component, wherein the pipe string fixing component comprises a first oil pipe, a pump base, a second oil pipe, a packer, a third oil pipe and a sand control device which are arranged from the upper part to the lower part in sequence; the sand control device comprises a sand control pipe, a sand setting pipe and a pressure control switching valve which are connected from the upper part to the lower part in sequence; the top end of the sand control pipe is communicated with the bottom end of the third oil pipe; a plurality of through holes for oil gas to enter are formed in the side wall of the sand control pipe; the pressure control switching valve can be opened or closed under the action of the fluid pressure in the oil pipes; the oil well pump component is positioned in the first oil pipe; the bottom end of the oil well pump component is detachably connected with the pump base. Compared with the prior art in which an acid fracturing transformation pipe string or acidizing transformation pipe string is drilled and then is pulled out, and then a sand control pipe string and a mechanical extraction oil pumping completion pipe string are respectively drilled, the pipe string and the completion method can realize acid fracturing or acidizing transformation, mechanical extraction oil pumping completion and sand control functions at the same time, save the working duration, and improve the working efficiency.

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 oilfield development, well completion operations are required in the later stage of drilling operations, and well completion operations are 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, thereby increasing the oil production, and then it is necessary to lower the completion string to prepare for oil production. During the process of oil production, many formations will Sand production, so the sand control function of the completion string should also be considered. [0003] Generally, for oil and gas wells with insufficient fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/00E21B43/22E21B43/02E21B43/08
CPCE21B43/00E21B43/02E21B43/088E21B43/121E21B43/16
Inventor 周建平张雪松李元斌练以峰季晓红
Owner PETROCHINA CO LTD
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