CN203584405U - Device for testing stability of drilled hole for coal bed gas extraction - Google Patents
Device for testing stability of drilled hole for coal bed gas extraction Download PDFInfo
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- CN203584405U CN203584405U CN201320739229.8U CN201320739229U CN203584405U CN 203584405 U CN203584405 U CN 203584405U CN 201320739229 U CN201320739229 U CN 201320739229U CN 203584405 U CN203584405 U CN 203584405U
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- drilled hole
- coal bed
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Abstract
The utility model discloses a device for testing stability of a drilled hole for coal bed gas extraction, and belongs to devices for testing stability of drilled holes for coal bed gas extraction. The device for testing stability of the drilled hole for coal bed gas extraction comprises a pressure sensor, a guide rod, a pressure data acquisition instrument and a pressure pump, wherein the pressure sensor is composed of a pressure sensing capsule and a liquid inlet, and the guide rod is composed of a PVC pipe, a clamping groove and a quick coupling. Pressurization is carried out on the pressure sensing capsule by using the pressure pump, so that the pressure sensing capsule expands, but pressure sensing capsule does not make contact with the hole wall of the drilled hole for gas extraction, the drilled hole contracts and deforms under the action of external force, changes of the pressure nearby are sensed through coupling contact between the pressure sensing capsule and the hole wall of the deformed drilled hole, pressure data are acquired through the data acquisition instrument, deformation conditions and hole collapse conditions in the whole drilling process are evaluated through multi-point pressure monitoring in the same drilled hole, and stability of the drilled hole for gas extraction is finally determined, in other words, the effective service life of the drilled hole is determined. The structure and a method are simple, site operation is easy, the dynamic changes of the hole diameter of the drilled hole for gas extraction can be monitored in real time, and thus real-time testing and evaluation of stability of the drilled hole for gas extraction are achieved.
Description
Technical field
The utility model relates to a kind of device and method that is determined at the mash gas pumping drilling stability of constructing in coal seam, particularly a kind of coal bed gas extraction borehole stability system safety testing device.
Background technology
Rich coal resources in China, distributional region is wide, but condition of coal seam occurrence difference is large, and Gas-bearing Coal Seams is many, and gas reserves is large, and meanwhile, mines more than China 90 % is pit mining, more than high gas and coal and gas outburst mine account for 50 % of mine sum.Therefore,, in progress of coal mining, be usually accompanied by gushing out of a large amount of gas.Particularly, along with the high-efficiency intensifying of coal production and the increase of the pit mining degree of depth, gas emission is increasing, and the threat of coal and Gas Outburst and gas explosion is also more and more serious.Gas Disaster has become the greatest factor of restriction China's coal-mine safety, High-efficient Production.
The major measure that solves Gas problem in high gas layer recovery process is gas pumping, and the fundamental policy that has been established as gas control " is first taken out afterwards and adopted " in reinforcement gas pumping, realization.Yet, the complex structure in China coal seam and many strong deformations, many high gas layers all belong to again low-permeable soft seam, this just requires gas pumping to have the enough extraction time, be that extraction borehole has enough stability and effective life, yet coal seam especially soft seam, because rheological characteristic is stronger, is caused after boring moulding be compacted within a short period of time (sometimes may only several hours) and is lost extraction function.
At present, the method of traditional evaluation borehole stability (Acceptable life) mainly realizes by the gas pumping parameter (comprising gas density, flow, scale etc.) of this boring, yet, gas pumping parameter is subject to the impact of the many factors such as sealing quality, string hole, data acquisition, while causing extraction parameter when a boring not satisfactory, cannot effectively judge that problem has appearred in which or which link, can not determine that whether boring is entirely ineffective.
Utility model content
Technical problem: the purpose of this utility model is for the practical problem existing in coal mine gas drainage, provides a kind of low cost, coal bed gas extraction borehole stability system safety testing device simple to operate.
Technical scheme: coal bed gas extraction borehole stability system safety testing device of the present utility model, comprises pressure sensor, guide peg, pressure data Acquisition Instrument and force (forcing) pump; Pressure sensor is connected with guide peg, and guide peg is linked in sequence by conduit road and pressure data Acquisition Instrument, valve and force (forcing) pump.
Described pressure sensor comprises pressure sensitive capsule and is connected to the inlet of a side.
Described guide peg comprises the snap joint at pvc pipe, draw-in groove and pvc pipe two ends; Pvc pipe forms main pipeline network, is surrounded by draw-in groove on main pipeline, is connected with snap joint on main pipeline;
Described pressure sensitive capsule is cylindrical, and length is 80 ~ 120 mm, and maximum swelling external diameter is not more than 60 mm, and inside is filled with gas or 2 kinds of induction mediums of liquid;
Described pvc pipe external diameter is 40 ~ 50 mm, internal diameter is 30 ~ 40 mm, every long 3 ~ 5 m, there is the draw-in groove of placement force induction capsule at positive middle part, draw-in groove size is corresponding with pressure sensitive capsule size, the axially upper size of draw-in groove is slightly larger than the size of pressure sensitive capsule, and pressure sensitive capsule can be snapped in draw-in groove, and footpath is the not expansion of confining pressure induction capsule upwards; Described pvc pipe intensity is greater than the intensity of induction capsule, and has certain suppleness, can meet gas drilling less tortuous variation thing move towards in direction, and meanwhile, pvc pipe two ends are installed snap joint and are convenient to the connection between many pvc pipes;
Described pressure data Acquisition Instrument has 4 passages, can gather the data of 4 sensors simultaneously, the data that gather can be passed through usb data memory real-time storage data, also can be connected with existing KJ Coal Mine Safety Monitoring System substation by standard signal output interface, real-time data transmission is arrived to ground.
Useful achievement: owing to having adopted technique scheme, by near the situation of change of the coal body pressure determination of pressure sensor of mash gas pumping drilling internal placement, amount of contraction, the amount of shifting near of directly near response sensor, holing, thus judge in this position boring whether occur collapse hole phenomenon; In boring, walk upwards every a segment distance, to arrange above-mentioned pressure sensor whether to lose efficacy according to the pressure information synthetic determination boring of each sensor, thereby avoided by gas pumping parameter, indirectly reflecting before the stability of boring.
The described pressure to the pressurization of pressure sensitive capsule is 0.3 ~ 0.5 MPa.When sensor reading corresponding to pressure sensitive capsule rises more than 40 % or be zero (illustrating that coal body is pressed capsule quick-fried under external force herein), illustrate that collapse hole appears in pressure sensitive capsule correspondence position; When 80 % respond to sensor reading that capsule is corresponding above, rise 40 % when above, illustrate that this boring is entirely ineffective.
Its advantage is:
(1) by multiple spot stress monitoring, directly test, assess the stability (being Acceptable life) of mash gas pumping drilling, it is more accurate than other indirect test method, to compare, and then can more effectively instruct the gas pumping practice under similar coal seam and gas bearing condition;
(2) data collecting instrument adopts 4 passages, has saved Acquisition Instrument number, has reduced the manufacturing cost of device;
(3) data collecting instrument can pass through USB interface real-time storage data and be connected with KJ Coal Mine Safety Monitoring System by standard signal output interface simultaneously, make staff can monitor borehole stability aboveground, when data transmission procedure breaks down, can call the data that USB implements storage, unlikely appearance monitoring blind area;
(4) simple in structure, low cost of manufacture, easy to operate, reliability is high.
Accompanying drawing explanation
Fig. 1 is the structure chart of the utility model coal bed gas extraction borehole stability real-time test device.
In figure, 1, pressure sensitive capsule; 2, inlet; 3, pvc pipe; 4, draw-in groove; 5, snap joint; 6, rubber hose; 7, pressure data Acquisition Instrument; 8, valve; 9, force (forcing) pump.
The specific embodiment
Below in conjunction with accompanying drawing, an embodiment of the present utility model is further described:
Coal bed gas extraction borehole stability real-time test device of the present utility model, mainly consists of pressure sensor, guide peg, pressure data Acquisition Instrument 7 and force (forcing) pump 9.Pressure sensor is connected with guide peg, and guide peg is linked in sequence by conduit road and pressure data Acquisition Instrument 7, valve and force (forcing) pump 9.Described pressure sensor comprises pressure sensitive capsule 1 and is connected to the inlet 2 on induction capsule 1, pressure sensitive capsule 1 inside can injecting gas or liquid as induction medium.Described guide peg comprises the snap joint 5 at pvc pipe 3, draw-in groove 4 and pvc pipe two ends; Pvc pipe 3 forms main pipeline network, is surrounded by draw-in groove on main pipeline, is connected with snap joint on main pipeline; Described pressure sensitive capsule 1 is cylindrical, and length is 80 ~ 120 mm, and maximum swelling external diameter is not more than 60 mm, and inside is filled with gas or 2 kinds of induction mediums of liquid; Pvc pipe 3 intensity are greater than the intensity of pressure sensitive capsule, and have certain suppleness, can meet gas drilling less tortuous variation thing move towards in direction; Described pvc pipe external diameter is 40 ~ 50 mm, internal diameter is 30 ~ 40 mm, every long 3 ~ 5 m, there is the draw-in groove 4 of placement force induction capsule 1 at positive middle part, draw-in groove size is corresponding with pressure sensitive capsule size, the axially upper size of draw-in groove is slightly larger than the size of pressure sensitive capsule, and pressure sensitive capsule can be snapped in draw-in groove, and footpath is the not expansion of confining pressure induction capsule upwards; Described pvc pipe intensity is greater than the intensity of induction capsule, and has certain suppleness, can meet gas drilling less tortuous variation thing move towards in direction, and meanwhile, the connection that 3 of many pvc pipes are convenient in snap joint 5 is installed at pvc pipe two ends.Described pressure data Acquisition Instrument 7 has 4 passages, can gather the data of 4 sensors simultaneously, the data that gather can be passed through usb data memory real-time storage data, also can be connected with existing KJ Coal Mine Safety Monitoring System substation by standard signal output interface, real-time data transmission is arrived to ground.
Claims (5)
1. a coal bed gas extraction borehole stability system safety testing device, is characterized in that: this testing arrangement comprises pressure sensor, guide peg, pressure data Acquisition Instrument and force (forcing) pump; Pressure sensor is connected with guide peg, and guide peg is linked in sequence by conduit road and pressure data Acquisition Instrument, valve and force (forcing) pump.
2. coal bed gas extraction borehole stability system safety testing device according to claim 1, is characterized in that: described pressure sensor comprises pressure sensitive capsule and is connected to the inlet of a side; Described pressure sensitive capsule is cylindrical, and length is 80 ~ 120 mm, and maximum swelling external diameter is not more than 60 mm, and inside is filled with gas or liquid strain induction medium.
3. coal bed gas extraction borehole stability system safety testing device according to claim 1, is characterized in that: described guide peg comprises the snap joint at pvc pipe, draw-in groove and pvc pipe two ends; Pvc pipe forms main pipeline network, is surrounded by draw-in groove on main pipeline, is connected with snap joint on main pipeline.
4. coal bed gas extraction borehole stability system safety testing device according to claim 3, it is characterized in that: described pvc pipe external diameter is 40 ~ 50 mm, internal diameter is 30 ~ 40 mm, every long 3 ~ 5 m, there is the draw-in groove of placement force induction capsule at positive middle part, and draw-in groove size is corresponding with pressure sensitive capsule size, and the axially upper size of draw-in groove is slightly larger than the size of pressure sensitive capsule, pressure sensitive capsule can be snapped in draw-in groove, and footpath is the not expansion of confining pressure induction capsule upwards; Described pvc pipe intensity is greater than the intensity of induction capsule, and has certain suppleness, can meet gas drilling less tortuous variation thing move towards in direction, and meanwhile, pvc pipe two ends are installed snap joint and are convenient to the connection between many pvc pipes.
5. coal bed gas extraction borehole stability system safety testing device according to claim 1, it is characterized in that: described pressure data Acquisition Instrument has 4 passages, can gather the data of 4 sensors simultaneously, the data that gather can be passed through usb data memory real-time storage data, also can be connected with existing KJ Coal Mine Safety Monitoring System substation by standard signal output interface, real-time data transmission is arrived to ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320739229.8U CN203584405U (en) | 2013-11-21 | 2013-11-21 | Device for testing stability of drilled hole for coal bed gas extraction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320739229.8U CN203584405U (en) | 2013-11-21 | 2013-11-21 | Device for testing stability of drilled hole for coal bed gas extraction |
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| Publication Number | Publication Date |
|---|---|
| CN203584405U true CN203584405U (en) | 2014-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320739229.8U Expired - Fee Related CN203584405U (en) | 2013-11-21 | 2013-11-21 | Device for testing stability of drilled hole for coal bed gas extraction |
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| CN (1) | CN203584405U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103603651A (en) * | 2013-11-21 | 2014-02-26 | 中国矿业大学 | Device and method for testing stability of coal seam gas extraction drilled hole |
| CN106593412A (en) * | 2017-02-20 | 2017-04-26 | 中国矿业大学(北京) | All-angle dynamic monitoring device for stability of gas extraction drilling hole and monitoring method |
| CN106989849A (en) * | 2017-05-15 | 2017-07-28 | 山东科技大学 | Single hole coal and rock directional stress is distributed and the integral monitoring device of deformation and monitoring method |
-
2013
- 2013-11-21 CN CN201320739229.8U patent/CN203584405U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103603651A (en) * | 2013-11-21 | 2014-02-26 | 中国矿业大学 | Device and method for testing stability of coal seam gas extraction drilled hole |
| CN103603651B (en) * | 2013-11-21 | 2016-08-17 | 中国矿业大学 | Devices and methods for testing the stability of coal seam gas extraction drilled holes |
| CN106593412A (en) * | 2017-02-20 | 2017-04-26 | 中国矿业大学(北京) | All-angle dynamic monitoring device for stability of gas extraction drilling hole and monitoring method |
| CN106593412B (en) * | 2017-02-20 | 2023-12-01 | 中国矿业大学(北京) | Dynamic monitoring device and monitoring method for stability of full-angle gas extraction borehole |
| CN106989849A (en) * | 2017-05-15 | 2017-07-28 | 山东科技大学 | Single hole coal and rock directional stress is distributed and the integral monitoring device of deformation and monitoring method |
| CN106989849B (en) * | 2017-05-15 | 2022-09-13 | 山东科技大学 | Single-hole coal-rock mass directional stress distribution and deformation integrated monitoring device and monitoring method |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140507 Termination date: 20141121 |
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| EXPY | Termination of patent right or utility model |