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A combined staged fracturing device, asynchronous dual-path drainage system and method

A segmented fracturing and asynchronous dual-channel technology, which is applied in the direction of mining fluid, earthwork drilling, drilling pipe, etc., can solve the problems of low gas drainage efficiency in soft and low-permeability coal seams, shorten the operation cycle and increase the expansion area , Reduce the effect of downhole fracturing operation cycle

Active Publication Date: 2021-12-14
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the defects and deficiencies in the prior art, the present invention provides a combined segmental fracturing device, an asynchronous two-way drainage system and method to solve the technical problem of low gas drainage efficiency in broken, soft and low-permeability coal seams in the prior art

Method used

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  • A combined staged fracturing device, asynchronous dual-path drainage system and method
  • A combined staged fracturing device, asynchronous dual-path drainage system and method
  • A combined staged fracturing device, asynchronous dual-path drainage system and method

Examples

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Embodiment 1

[0044] Comply with the above technical solutions, such as Figure 2 to Figure 4 As shown, this embodiment provides a downhole coiled tubing united segmental fracturing device, which includes a downhole coiled tubing device transportation platform 1, and a roller lifter is vertically arranged on the downhole coiled tubing device transportation platform 1 along the horizontal direction from front to back. 2. Downhole coiled tubing power transmission device elevator 3 and blowout preventer elevator 4. Drum elevator 2 is provided with drum 5, and downhole coiled tubing 6 is wound around drum 5. Downhole coiled tubing power transmission device elevator 3 is provided with downhole continuous Oil pipe power transmission device 7, blowout preventer 8 is set on the blowout preventer lifter 4;

[0045] The blowout preventer 8 is connected to the orifice device 9, and an annular space is formed between the orifice device 9, the blowout preventer 8 and the downhole coiled tubing power del...

Embodiment 2

[0058] Such as Figure 5 As shown, this embodiment provides an asynchronous two-way combined fracturing gas drainage system, which includes the downhole coiled tubing combined sectional fracturing device disclosed in Embodiment 1, and also includes a downhole fracturing fluid diversion device 21, The input end of the downhole fracturing fluid diversion device 21 is connected to the output end of the surface coiled tubing 22, the first output end of the downhole fracturing fluid diversion device 21 is connected to the annular sanding fracturing fluid pipeline 13, and the downhole fracturing fluid diversion device 21 The second output end of the downhole coiled tubing hydraulic injection fluid pipeline 23 communicates with the downhole coiled tubing 6, and the downhole coiled tubing hydraulic injection fluid pipeline 23 is provided with a downhole coiled tubing liquid delivery control valve 26, and an annular sanding fracturing fluid pipeline 13 An annular sand-adding fracturing...

Embodiment 3

[0068] The mining target coal seam in this embodiment is a high gas outburst coal seam in a coal mine, the coal seam solidity coefficient f value of this coal mine is 0.3, and the gas content of the coal seam is 14~20m 3 / t, belongs to high gas outburst mines, which seriously threatens the safety of coal seams.

[0069] Such as figure 1 As shown, this embodiment provides an asynchronous two-way joint staged fracturing gas drainage method, which is realized by the asynchronous two-way joint staged fracturing gas drainage system disclosed in Embodiment 2, and includes the following steps:

[0070] Step 1. Excavate an underground roadway in the stable rock formation above the coal seam and construct multiple directional long boreholes, and then run the casing to complete the well;

[0071] In this embodiment, as a preference, the long boreholes are arranged according to the distance between adjacent long directional boreholes of 50-60m, the design depth of a single hole is 300-8...

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Abstract

The invention discloses a downhole coiled tubing combined segmental fracturing device, system and method. The device includes a downhole coiled tubing device transportation platform, a drum equipped with downhole coiled tubing installed on the downhole coiled tubing device transportation platform, and downhole coiled tubing power transmission. device and blowout preventer; the downhole coiled tubing power delivery device drives the downhole coiled tubing to reciprocate back and forth in the annulus formed by the orifice device, the blowout preventer and the downhole coiled tubing power delivery device; the system includes downhole coiled tubing combined segmental fracturing The device and the downhole fracturing fluid diversion device, the input end of the downhole fracturing fluid diversion device is connected with the fracturing fluid output end of the surface coiled tubing, and the output end is respectively connected with the annular sanding fracturing fluid pipeline and the downhole coiled tubing; the present invention It also discloses a downhole coiled tubing combined segmental fracturing method, which realizes the combined operation of perforation with pressure at the orifice without blowout and annular space injection fracturing, and shortens the downhole long drilling segmental fracturing operation cycle.

Description

technical field [0001] The invention belongs to the technical field of gas drainage in coal mines, and relates to a gas drainage device and method, in particular to a combined segmental fracturing device, an asynchronous two-way drainage system and a method. Background technique [0002] Surface coalbed methane development and coal mine negative pressure gas drainage are conventional means of coalbed methane drainage. However, the existing surface coalbed methane development methods have high investment costs, long drainage periods, low drainage efficiency, and large terrain restrictions. Disadvantages: The underground negative pressure gas drainage method of coal mines has the disadvantages of small fracturing pump injection displacement, difficult equipment transportation, and poor coal seam permeability enhancement effect due to the limitation of underground operating environment conditions. Utilizing the large-volume sand-adding fracturing technology in the development o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26E21B43/267E21B43/114E21B19/22E21B43/00
CPCE21B43/26E21B43/2607E21B43/267E21B43/114E21B19/22E21B43/006
Inventor 刘磊张群姜在炳程斌舒建生降文萍杨建超李浩哲
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP