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Coal bed gas directional well injection/fall-off well testing device and method thereof

A testing device and directional well technology, which is applied in the direction of wellbore/well valve device, wellbore/well components, measurement, etc., to achieve the effect of convenient operation, wide application and simple structure

Inactive Publication Date: 2017-03-15
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

Coalbed methane directional wells are generally carried out in two-dimensional space, and there is a certain spatial displacement between the target point and the surface wellhead, and there is a certain inclination angle in the stabilizing section; inclined vertical wells are drilled perpendicular to the coal seam, and the wellbore has a certain inclination angle; while the current The CBM well injection / pressure drop test test device and test method can only be carried out in vertical wells, and cannot be carried out in inclined wellbore

Method used

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  • Coal bed gas directional well injection/fall-off well testing device and method thereof
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  • Coal bed gas directional well injection/fall-off well testing device and method thereof

Examples

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Embodiment

[0083] Well SL01 is located in a certain place. It is a coalbed methane directional well. The wellbore is perpendicular to the coal seam. The full angle change rate of 3 consecutive points in the inclined section is ≤3° / 30m. The secondary wellbore structure is adopted. The production casing is φ139.7mm. The perforation position of No. 41 coal seam is 668.20-675.30m, and the thickness of the coal seam is 7.10m.

[0084] Injection / pressure drop test adopts φ105mm lower packer, φ73.0mm screen pipe, φ6.35mm expansion pipeline, φ60.3mm electronic pressure gauge holder, φ82mm downhole switch valve, φ73.0mm ball seat tray, φ60.3mm small Ball seat, φ73.0mm large ball seat, φ105mm upper packer, φ73.0mm tubing, φ73.0mm wellhead device, φ1 / 2in, P=35MPa wellhead high pressure valve, φ19.00mm, P=35MPa high pressure manifold, Q =123L / min, P=25MPa high pressure pump.

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Abstract

The invention belongs to the technical field of coal bed gas well testing, and in particular relates to a coal bed gas directional well injection / fall-off well testing device and a method thereof. The device provided by the invention is simple in structure and convenient to operate, has a better effect and wider application range, and can effectively and reliably obtain coal reservoir parameters when being used for testing a coal bed gas directional well. The device comprises a wellhead device, a test tubular column, an upper packer, a big ball seat, a small ball seat, a ball seat tray, a downhole switch valve, an electronic pressure gauge, a screen tube and a lower packer which are connected from top to bottom in a shaft; the upper packer is communicated with the lower packer through an expansion pipeline, and testing is realized by adopting a certain method.

Description

technical field [0001] The invention belongs to the technical field of coalbed gas well testing, and in particular relates to a coalbed gas directional well injection / pressure drop testing device and a method thereof. Background technique [0002] Well testing is an effective technical means for understanding reservoirs, evaluating reservoirs and monitoring production dynamics. At present, the way to obtain the reservoir parameters of coalbed methane wells in China is mainly to conduct injection / pressure drop tests in vertical wells. The current implementation standard is "Coalbed Gas Well Injection / Pressure Drop Test Methods" GB / T 24504-2009. With the intensification of coalbed methane exploration, as well as the improvement of the understanding of coal reservoir characteristics, coalbed methane drilling technology, drainage technology, etc., when drilling inclined coal seams and steeply inclined coal seams, in order to ensure that the wellbore is perpendicular to the coal ...

Claims

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Application Information

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IPC IPC(8): E21B47/00E21B49/00E21B33/122E21B34/06
CPCE21B47/00E21B33/122E21B34/06E21B49/00
Inventor 杨新辉
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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