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Horizontal well liquid nitrogen ice crystal temperature plugging staged fracturing method for coalbed methane

A staged fracturing and horizontal well technology, which is applied in the field of oil and gas well fracturing, can solve the problems of high risk of sand burial of packers, difficulty in lifting the pipe string, and poor segmentation pertinence, so as to increase the permeability of coal and rock, The effect of increasing production is obvious and the effect of increasing the deflated area

Active Publication Date: 2016-04-20
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The staged fracturing technology of packer + sliding sleeve sand blaster has the disadvantages of high cementing quality requirements, high risk of sand burial of packer and difficulty in lifting the pipe string
Current-limited fracturing technology is mostly used in horizontal wells with longitudinal fractures, and the pertinence of segmentation is relatively poor; the fracture (reservoir) coverage and the stimulation of horizontal sections are uncertain, and it is difficult to design when the stress and fracture tortuosity of different sections are different ; The initiation and extension of each fracture are not balanced, which will affect the stimulation effect

Method used

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  • Horizontal well liquid nitrogen ice crystal temperature plugging staged fracturing method for coalbed methane
  • Horizontal well liquid nitrogen ice crystal temperature plugging staged fracturing method for coalbed methane
  • Horizontal well liquid nitrogen ice crystal temperature plugging staged fracturing method for coalbed methane

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Embodiment 1

[0072] The staged fracturing method for temporary plugging of liquid nitrogen ice crystals in horizontal coalbed methane wells in this embodiment includes the following steps:

[0073] S11: Shot open the interval, run the heat-insulated tubing 200 into the jacket 100 in the horizontal well, set the interval to be fractured with a single-channel packer 300 , and inject it into the annular space between the jacket 100 and the heat-insulated tubing 200 Inject hot nitrogen to discharge wellbore fluid;

[0074] According to the on-site construction design, all intervals are shot open, the heat-insulated tubing 200 is lowered and the single-channel packer 300 is set (set on the outer wall of the heat-insulated tubing 200 and fixed relatively to the inner wall of the jacket 100 after setting), Make the liquid outlet 201 of the heat-insulated tubing 200 face the perforation hole 101 corresponding to the interval to be fractured on the jacket 100, inject hot nitrogen into the annular spa...

Embodiment 2

[0083] A staged fracturing method for temporary plugging of liquid nitrogen ice crystals in horizontal coalbed methane wells, comprising the following steps:

[0084] S21: Shot open the interval, run the heat-insulated tubing 200 into the jacket 100 in the horizontal well, set the interval to be fractured with a single-channel packer 300 , and run it into the annular space between the jacket 100 and the heat-insulated tubing 200 Inject nitrogen at a temperature of 30°C to discharge wellbore fluid;

[0085] Wherein, in this step, according to the interval to be fractured, two rows of perforation holes 101 are arranged symmetrically along the axial direction on the pipe wall in the horizontal section of the jacket 100 in advance, and in order to facilitate fracturing, the perforation holes 101 The cement sheath outside the corresponding overcoat 100 of the place also drills a small gap.

[0086] S22: Inject hot nitrogen into the heat-insulated oil pipe 200 and the annular space...

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Abstract

The invention provides a horizontal well liquid nitrogen ice crystal temperature plugging staged fracturing method for coalbed methane and belongs to the technical field of well fracturing. The method includes: perforating a stratum interval to discharge wellbore liquid, then using liquid nitrogen to open a stratum crack through pressing, allowing the liquid nitrogen to enter the crack, and injecting water to the inlet of the crack to form ice crystal temperature plugging due to the fact that the water freezes at the inlet of the crack under the effect of the liquid nitrogen so as to complete the fracturing of the stratum interval. The fracturing method has the advantages that the coal rock permeability around the crack can be increased effectively, coalbed methane discharge area can be increased, and yield can be increased evidently; in addition, an extremely-low reservoir environment is produced in a reservoir by using liquid nitrogen fracturing, the injected water freezes at the inlet of the crack and around the inlet of the crack to form the ice crystal temporary plugging, only one single-channel packer is needed to achieve the staged fracturing effect, and the method is simple in procedures, easy to operate, capable of saving time and space and capable of increasing operation efficiency.

Description

technical field [0001] The invention relates to the technical field of oil and gas well fracturing, in particular to a staged fracturing method for temporary plugging of liquid nitrogen ice crystals in horizontal wells of coalbed methane. Background technique [0002] Coalbed methane mainly occurs in the matrix pores of coal rocks in an adsorbed state. As an unconventional oil and gas resource, it has a huge amount of resources in my country, and the amount of coalbed methane resources buried within 2000 meters is 36.81×10 12 m 3 , equivalent to all conventional natural gas resources. [0003] my country's coalbed methane usually has the "three lows" characteristics of low pressure, low permeability, and low saturation, which brings great difficulties to the development process of coalbed methane, and often shows the phenomenon of "high resources and low production capacity". By the end of 2012, a total of more than 11,000 coalbed methane wells had been completed nationwid...

Claims

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Application Information

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IPC IPC(8): E21B43/26
CPCE21B43/26
Inventor 杨兆中贾敏张云鹏李小刚张璐杨苏何睿
Owner SOUTHWEST PETROLEUM UNIV
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