Production method of preset small-diameter pipe for sidetracking well and slim hole well

A technology of small-diameter pipes and production methods, which is applied in wellbore/well components, earth-moving drilling, and fluid production, etc., can solve the problems of short life and large reservoir damage, and achieve extended extension distance, prolong gas well life, and improve The effect of liquid-carrying capacity in gas wells

Active Publication Date: 2021-03-16
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems of short service life of existing gas wells and great damage to reservoirs, the present invention provides a production method of preset small-diameter pipes for sidetracking wells and slimhole wells. Before fracturing, the small-diameter pipes are lowered into casings In the pipe, it avoids the downhole small-diameter pipe during the production process, which can reduce reservoir damage and prolong the life of the gas well

Method used

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  • Production method of preset small-diameter pipe for sidetracking well and slim hole well
  • Production method of preset small-diameter pipe for sidetracking well and slim hole well

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Embodiment 1

[0029] In order to overcome the problems of short service life of existing gas wells and great damage to reservoirs, the present invention provides such as figure 1 and figure 2 Shown is a production method of preset small-diameter pipes for sidetracking and slimhole wells. Before the fracturing reconstruction of the present invention, the small-diameter pipes are lowered into the casing, which avoids the downhole small-diameter pipes being suppressed during the production process, and can reduce storage capacity. layer damage and prolong the life of the gas well. The invention adopts a small-diameter tube instead of a coiled tubing as a velocity string to run into the wellbore, so as to improve the liquid-carrying capacity of the gas well, prolong the production period of the gas well, and greatly reduce the production cost of the gas well.

[0030] A method for producing a preset small-diameter pipe for sidetracking and slimhole wells, the specific steps are:

[0031] Ste...

Embodiment 2

[0041] Based on Example 1, in this example, preferably, in Step 1, the fracturing strings produced by using open hole packers for sidetracked wells and slimhole wells and presetting small-diameter pipes include lost Hand back barrel 3, casing packer 4, tubing 5, multiple reservoir packers, multiple sand blasters, floating hoop 12 and guide screen 13, reservoir packers and sand blasters alternately Setting, the lower end of the throw-back sleeve 3 is connected to the casing packer 4, the casing packer 4 is set at the inner lower part of the casing 1, and the lower end of the casing 1 is an open hole section 14, The open hole section 14 is arranged obliquely; the plurality of reservoir packers are distributed in the open hole section 14 from top to bottom, and each reservoir packer is provided with a sand blaster at the lower end. The uppermost reservoir packer is connected to the lower end of the casing packer 4 through the tubing 5 .

[0042] Preferably, the sand blaster incl...

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Abstract

The invention provides a method for producing a preset small-diameter pipe for a sidetracking well and a slim hole well, which comprises the following specific steps: 1, lowering a fracturing pipe column produced by fracturing the sidetracking well and the slim hole well by using an open hole packer and the preset small-diameter pipe to a preset position of a target reservoir, and ensuring that acasing packer is suspended at a position 10-15m above a sidetracking well windowing position; aligning the sand blaster to a reservoir to be transformed, and the reservoir packers clamp the reservoirtransformation section and avoid the casing joint hoop; 2, locating a pumping large-diameter steel ball at a reducing release tie-back cylinder, and when the pumping large-diameter steel ball is pressed to 25 Mpa, a casing packer and a reservoir packer are subjected to setting; and when the pressure is increased to 35Mpa, releasing the releasing tie-back cylinder for three times, and pulling out the part above the releasing tie-back cylinder. The fracturing fluid is injected from the oil jacket annulus, the construction displacement can reach 6 m < 3 > / min or above, the transformation scale can be enlarged, and the crack extension distance can be prolonged; The liquid carrying capacity of the gas well is improved, and the production cost of the gas well can be greatly reduced while the production period of the gas well is prolonged.

Description

technical field [0001] The invention relates to the technical field of downhole operations in oilfield exploration and development, in particular to a production method for preset small-diameter pipes for sidetracking wells and slimhole wells, and specifically belongs to the technical field of repeated fracturing in oil and gas fields. Background technique [0002] As most oil reservoirs in China are gradually entering the middle and late stage of development, it is extremely urgent to effectively produce remaining oil in the formation and fully tap the potential of the reservoir. It is particularly urgent to maintain stable production in mature areas at low cost. Considering factors such as reducing drilling investment, land acquisition costs, and ground equipment costs, in the original As an effective technology, sidetracking new wellbore in old well intervals has been paid more and more attention. For reservoirs with many formations, it is of great significance to carry o...

Claims

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Application Information

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IPC IPC(8): E21B43/26E21B33/122E21B43/114E21B43/14
CPCE21B43/26E21B33/122E21B43/114E21B43/14
Inventor 姜勇刘汉斌杨志伟张宏福刘锐高伟姬伟唐军吕杨王汝阳
Owner PETROCHINA CO LTD
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