CN107201893B - A device for testing and grading output contribution rate of multi-coalbed methane wells - Google Patents

Abstract

The invention relates to a multi-coal bed gas well output contribution rate testing and grading device which comprises at least two coal bed gas well output contribution rate testing and grading devices, wherein the coal bed gas well output contribution rate testing and grading devices are arranged in a coal bed gas well, the coal bed gas well penetrates through at least two coal beds, and the coal bed gas well output contribution rate testing and grading devices are arranged at the coal beds and can realize separation and independent metering of all coal bed gas-water mixtures, so that the occupation ratio of all coal beds in the total gas-water mixture is calculated.

Description

A device for testing and grading output contribution rate of multi-coalbed methane wells

technical field

The invention relates to the technical field of output contribution rate testing of coalbed methane wells, in particular to a grading device for output contribution rate testing of multiple coalbed methane wells.

Background technique

Coalbed methane is a new type of clean energy. Its development and utilization not only make up for the shortage of conventional oil and gas resources to a certain extent, but also reduce the degree of mine disasters and reduce greenhouse gas emissions. Due to the characteristics of low pressure, low permeability and low saturation of coal seams in my country, the gas production of single coal seam mining is relatively low. Mining, multi-coal seam stratified fracturing and coal seam drainage technology. The joint drainage and production of multiple coal seams not only reduces the development cost, but also increases the single-well productivity of CBM wells. In the process of multi-coal seam mining, due to the differences in the physical properties of the reservoirs between the coal seams, the gas and water supply capacities between the coal seams are different, resulting in inter-layer interference and affecting the productivity of the coalbed methane wells. Therefore, real-time tracking is required. The dynamic change of the water output of each coalbed methane can make timely adjustments to the working system of coalbed methane well drainage, and can also verify and feedback the development plan of multiple coal seams. Due to the strong sensitivity of the coal seam, the daily gas and water production of a single coal seam is small, and the accuracy of the device is high; and the underground situation of the coalbed methane well is complex, and the flexibility of the device is high. At present, the multi-coal seam stratification test technology is only simulated in the laboratory, and there are few related studies. There is no mature device at home and abroad for the gas-water production test of multi-coal seam. Therefore, it is very necessary to develop a gas-water contribution rate measurement device suitable for multiple coal seams.

SUMMARY OF THE INVENTION

In order to solve the above technical problems, the present invention provides a multi-coalbed methane well production contribution rate test and classification device.

A multi-coalbed methane well output contribution rate test and classification device, comprising at least two coalbed methane well output contribution rate test and classification devices, the coalbed methane well output contribution rate test and classification device is placed in a coalbed methane well, and the coalbed methane well passes through At least two coal seams, and the coalbed methane well output contribution rate testing and grading device is located at the coal seams.

Preferably, there are two CBM well output contribution rate testing and classification devices, and they are respectively a first-level CBM well output contribution rate testing device and a second-level CBM well output contribution rate testing and classifying device, and the CBM well passes through Two coal seams are respectively a first-class coal seam and a second-class coal seam, the first-class stratum is below the first-class coal seam, and the second-class stratum is above it, the second-class stratum is below the second-class coal seam, and the third-class stratum is above, The first-level coalbed methane well output contribution rate test and classification device passes through the first-level coal seam, and the upper end of the first-level coalbed methane well output contribution rate test and classification device is located in the second-level stratum, and the lower end is located in the first-level stratum the secondary coalbed methane well output contribution rate testing and grading device passes through the secondary coal seam, the upper end of the secondary coalbed methane well output contribution rate testing and grading device is located in the tertiary stratum, and the lower end is located in the secondary stratum strata.

Preferably, the CBM well output contribution rate testing and grading device includes a coal seam mining buffer box, both ends of the coal seam mining buffer box are fixed with a sealing adjustment mechanism, and an end of the sealing adjustment mechanism is fixed with a sealing cup, The center of the coalbed methane well output contribution rate test and classification device is provided with a gas-water mixed transportation main pipe with both ends transparent, and the coalbed mining buffer tank is provided with a gas-water mixed storage chamber and a gas-water separation device. The separation device is located above the gas-water mixing storage cavity, and the gas-water mixing storage cavity is an annular cavity including an upper sealing plate and a lower sealing plate, and a plurality of annular uniformly distributed and The gas-water mixing inlet communicated with the gas-water mixing storage cavity, and the gas-water mixing inlet has an arc-shaped groove structure.

Preferably, the gas-water separation device comprises a plurality of annularly arranged gas-water mixing conveying pipes, and the lower part of the gas-water mixing conveying pipes is welded on the upper sealing plate and communicates with the gas-water mixing storage chamber, so The upper part of the air-water mixing conveying pipe is bent inwardly, and a water diversion pipe extending obliquely downward is provided at the bend, the end of the air-water mixing conveying pipe is sealed, and the lower part of the air-water mixing conveying pipe is connected There is a water conveying pipe communicated with the water distribution pipe, and a gas conveying pipe is connected above. The interior of the pipe is provided with a transverse gas-water separation barrier network between the water distribution pipe and the water conveying pipe, a water flow meter is arranged in the middle of the water conveying pipe, and a gas is arranged in the middle of the gas conveying pipe flowmeter.

Preferably, the inside of the gas delivery pipe is provided with a longitudinal gas-water separation barrier screen located below the gas flow meter.

Preferably, the sealing adjustment mechanism includes an annular fixing plate fixedly connected to the coal seam mining buffer tank, an everted edge is arranged above the annular fixing plate, and the sealing cup includes an upper cup and a lower cup , the upper layer cup and the lower layer cup are fixed on the edge of the annular fixing plate with screws, the side surface of the annular fixing plate is provided with a plurality of rectangular grooves that are uniformly distributed in the ring, and the upper part of the rectangular groove is A small hydraulic cylinder is fixed on the end surface, the telescopic rod of the small hydraulic cylinder is connected with a guide rod, the outer side of the guide rod is pierced with a compression spring that is fixedly connected to the guide rod below, and the guide rod is also pierced with a A sliding seat above the compression spring, the sliding seat is hinged with a variable diameter push rod, the annular fixing plate is provided with a fixing seat fixed above the rectangular groove, the fixing seat is hinged with a roller link, and the roller is connected The ends of the rods are forked and connected with variable-diameter rollers by pins. The variable-diameter rollers are evenly distributed under the lower leather cup. There are grooves under the roller connecting rods. The upper end is located in the groove of the roller link.

Preferably, the upper layer cup and the lower layer cup are both magnetic bodies made of rubber and magnetic materials, the material of the gas-water mixing and conveying main pipe is steel, and the upper cup and the lower cup are magnetic bodies. All of them are tightly fitted with the gas-water mixing and conveying main pipe.

The beneficial effects of the present invention are:

The multi-coalbed methane well output contribution rate testing and grading device of the present invention can realize the separation and separate measurement of each coalbed methane-water mixture, so as to calculate the proportion of each coalbed in the total gas-water mixture; sealing adjustment The mechanism and the sealing cup can seal the measured coal seam up and down to prevent the occurrence of the gas-water mixture of each coal seam in the process of coal seam mining at all levels, and ensure the accuracy of the test; the gas-water separation device can skillfully separate the gas and water. separation for easy determination.

Description of drawings

Fig. 1 is the structural representation of the present invention;

Fig. 2 is the front view structure schematic diagram of the CBM output contribution rate test device;

Fig. 3 is the partial enlarged schematic diagram of Fig. 2;

Figure 4 is a schematic cross-sectional structure diagram of a CBM output contribution rate testing device;

Fig. 5 is the partial enlarged schematic diagram of place I in Fig. 4;

Fig. 6 is the partial enlarged schematic diagram of II in Fig. 4;

In the figure: 1. First-class formation, 2. First-class coal seam, 3. Second-class formation, 4. Second-class coal seam, 5. Third-class formation, 6. First-class coalbed methane well output contribution rate test and classification device, 7. Second Class CBM well output contribution rate test and classification device, 8. Coal seam mining buffer box, 801. Gas-water mixing inlet, 802. Gas-water mixing storage cavity, 803. Lower sealing plate, 804. Upper sealing plate, 9. Sealing cup , 901. Upper leather cup, 902. Lower leather cup, 10. Sealing adjustment mechanism, 1001. Ring fixing plate, 1002. Small hydraulic cylinder, 1003. Guide rod, 1004. Sliding seat, 1005. Variable diameter push rod, 1006. Roller connecting rod, 1007. Fixed seat, 1008. Variable diameter roller, 11. Gas-water mixed conveying main pipe, 12. Air-water mixing conveying pipe, 13. Water flow pipe, 14. Horizontal gas-water separation barrier net, 15. Water conveying Pipe, 16. Water flow meter, 17. Gas delivery pipe, 18. Longitudinal gas-water separation barrier net, 19. Gas flow meter.

Detailed ways

The specific embodiment of the present invention is referring to Fig. 1-6:

The present invention mainly discloses a multi-coalbed methane well output contribution rate testing and grading device. The basic principle of the ordinary hydraulic cylinder involved is well known to those skilled in the relevant technical field. Therefore, as described in the following, the ordinary hydraulic cylinder will not be used for further details. full description. At the same time, the drawings compared in the following mainly express the structural schematic diagrams related to the features of the present invention, and are not and do not need to be completely drawn according to the actual size, which are described above.

Embodiment 1, as shown in FIG. 1 , a multi-coalbed methane well output contribution rate testing and grading device includes at least two coalbed methane well output contribution rate testing and grading devices, and the coalbed methane well output contribution rate testing and grading devices are placed in the coalbed methane well. wherein, the coalbed methane well passes through at least two coalbeds, and the coalbed methane well output contribution rate testing and grading device is located at the coalbeds.

Preferably, there are two CBM well output contribution rate testing and classification devices, which are respectively a first-level CBM well output contribution rate testing device 6 and a second-level CBM well output contribution rate testing and classifying device 7. The CBM well It passes through two coal seams and is a first-class coal seam 2 and a second-class coal seam 4 respectively. Below the first-class coal seam 2 is a first-class formation 1, above it is a second-class formation 3, and below the second-class coal seam 4 is a second-class seam The stratum 3, above it is the third-level stratum 5, the first-level coalbed methane well output contribution rate testing and grading device 6 passes through the first-level coalbed 2, and the upper end of the first-level coalbed methane well output contribution rate testing and grading device 6 is located. The secondary formation 3, the lower end is located in the primary formation 1, the secondary coalbed methane well output contribution rate test and classification device 7 passes through the secondary coalbed 4, the secondary coalbed methane well output contribution rate test The upper end of the classification device 7 is located in the tertiary formation 5 , and the lower end is located in the secondary formation 3 .

The first-level coalbed methane well output contribution rate test and classification device 6 tests the coalbed methane of the first-level coalbed 2, and the second-level coalbed methane well output contribution rate test and classification device 7 tests the second-level coalbed 4, which can realize the detection of each coalbed methane and water. The mixtures are separated and individually metered to calculate the proportion of each coal seam in the total gas-water mixture.

The second embodiment, as shown in Figures 2-6, is basically the same as the first embodiment. Further, the CBM well output contribution rate testing and grading device includes a coal seam mining buffer box 8, and both ends of the coal seam mining buffer box 8 are fixed. There is a sealing adjustment mechanism 10, the end of the sealing adjustment mechanism 10 is fixed with a sealing cup 9, and the center of the coalbed methane well output contribution rate testing and grading device is provided with a gas-water mixed conveying main pipe 11 with both ends transparent. The coal seam mining buffer tank 8 is provided with a gas-water mixing storage chamber 802 and a gas-water separation device, the gas-water separation device is located above the gas-water mixing storage chamber 802, and the gas-water mixing storage chamber 802 includes an upper The annular cavity of the sealing plate 804 and the lower sealing plate 803, the side of the coal seam mining buffer tank 8 is provided with a plurality of gas-water mixing inlets 801 which are uniformly distributed in the ring and communicate with the gas-water mixing storage cavity 802. The water mixing inlet 801 has an arc groove structure.

The gas-water separation device includes a plurality of annularly arranged gas-water mixing conveying pipes 12, and the lower part of the gas-water mixing conveying pipes 12 is welded on the upper sealing plate 804 and communicates with the gas-water mixing storage chamber 802, The upper side of the gas-water mixing conveying pipe 12 is bent inwardly, and a water distribution pipe 13 extending obliquely downward is provided at the bend. The end of the gas-water mixing conveying pipe 12 is sealed, and the gas-water mixing conveying The lower part of the pipe 12 is connected with a water delivery pipe 15 that communicates with the water diversion pipe 13, and the upper part is connected with a gas delivery pipe 17. The ends of the water delivery pipe 15 and the gas delivery pipe 17 are both mixed with the gas and water. The main conveying pipe 11 communicates with each other, and the inside of the gas-water mixing conveying pipe 12 is provided with a transverse air-water separation and barrier net 14 located between the water distribution pipe 13 and the water conveying pipe 15. The middle of the water conveying pipe 15 A water flow meter 16 is provided, and a gas flow meter 19 is provided in the middle of the gas conveying pipe 17; the horizontal gas-water separation barrier net 14 is formed by horizontal stacking of multi-mesh barrier nets, which ensures the permeability of the gas but is not effective for water. However, a flow resistance is formed. Since the gas density is less than the liquid density, the gas enters the gas delivery pipe 17 through the gas-water mixing delivery pipe 12, and the water in the gas-water mixing delivery pipe 12 passes through the resistance of the horizontal gas-water separation barrier network 14 and the effect of gravity. It turns downward into the water flow pipe 13 with less resistance, and enters the water conveying pipe 15; the gas-water separation device can skillfully separate the gas and water, and it is convenient to measure the flow of water and gas respectively.

Preferably, the sealing adjustment mechanism 10 includes an annular fixing plate 1001 fixedly connected to the coal seam mining buffer tank 8 , an everted edge is provided above the annular fixing plate 1001 , and the sealing cup 9 includes an upper skin The bowl 901 and the lower layer cup 902, the upper layer cup 901 and the lower layer cup 902 are fixed on the edge of the annular fixing plate 1001 with screws, and the side surface of the annular fixing plate 1001 is provided with a plurality of annular A small hydraulic cylinder 1002 is fixed on the upper end surface of the rectangular groove, and a guide rod 1003 is connected to the telescopic rod of the small hydraulic cylinder 1002. A fixedly connected compression spring, the guide rod 1003 also wears a sliding seat 1004 located above the compression spring, the sliding seat 1004 is hinged with a variable diameter push rod 1005, and the annular fixing plate 1001 is fixed on the A fixed seat 1007 above the rectangular groove, the fixed seat 1007 is hinged with a roller link 1006, the end of the roller link 1006 is forked, and the variable diameter rollers 1008 are connected with a pin, and the variable diameter rollers 1008 are evenly distributed in the Below the lower cup 902, a groove is formed under the roller link 1006, and the upper end of the variable diameter push rod 1005 is located in the groove of the roller link 1006; the upper cup 901 and The lower layer cup 902 is a magnetic body composed of rubber and magnetic material, the material of the gas-water mixing and conveying main pipe 11 is steel, and the upper cup 901 and the lower cup 902 are both compatible with the gas. The water mixing and conveying main pipe 11 is tightly fitted; the sealing adjustment mechanism 10 and the sealing cup 9 can seal the measured coal seam up and down to prevent the occurrence of the occurrence of the coal seam gas-water mixture in the process of coal seam mining at all levels, and ensure the test accuracy.

The third embodiment, as shown in FIGS. 4 and 6 , is basically the same as the first or second embodiment. Further, the inside of the gas delivery pipe 17 is provided with a longitudinal gas-water separation barrier 18 located below the gas flow meter 19 . , further gas-water separation is performed for the gas treated by the horizontal gas-water separation barrier net 14, and the separated water falls into the water conveying pipe 15 under the action of gravity.

Claims (5)

1. The utility model provides a many coal bed gas well output contribution rate test grading plant, its characterized in that includes two at least coal bed gas well output contribution rate test grading plant, coal bed gas well output contribution rate test grading plant places in the coal bed gas well, the coal bed gas well passes two at least coal seams, coal bed gas well output contribution rate test grading plant is located coal seam department, coal bed gas well output contribution rate test grading plant includes the coal bed exploitation buffer tank, the both ends of coal bed exploitation buffer tank all are fixed with sealed adjustment mechanism, sealed adjustment mechanism's end fixing has sealed leather cup, the center of coal bed gas well output contribution rate test grading plant is equipped with the penetrating gas water mixing conveying house steward in both ends, the inside of coal bed exploitation buffer tank is equipped with gas water mixing storage chamber and gas water separator, gas water separator is located the top of gas water mixing storage chamber, the gas-water mixing storage cavity is an annular cavity comprising an upper sealing plate and a lower sealing plate, the side surface of the coal seam mining buffer box is provided with a plurality of annular uniform distributions and is communicated with a gas-water mixing inlet of the gas-water mixing storage cavity, the gas-water mixing inlet is of an arc-shaped groove structure, the gas-water separating device comprises a plurality of annular gas-water mixing conveying pipes, the lower parts of the gas-water mixing conveying pipes are welded on the upper sealing plate and are communicated with the gas-water mixing storage cavity, the upper parts of the gas-water mixing conveying pipes are bent towards the inner side and are provided with water flow dividing pipes extending towards the inclined lower parts at the bent parts, the tail ends of the gas-water mixing conveying pipes are connected with the water conveying pipes communicated with the water flow dividing pipes, the upper parts of the gas conveying pipes are connected with gas conveying pipes, and the tail ends of the, the inside of gas-water mixing conveying pipe is equipped with and is located the water shunt tubes with horizontal gas-water separation barrier net between the water conveying pipe, the middle part of water conveying pipe is equipped with the water flowmeter, the middle part of gas conveying pipe is equipped with gas flowmeter.

2. The multi-coalbed methane well output contribution rate testing and grading device as claimed in claim 1, wherein the coalbed methane well output contribution rate testing and grading device is two and respectively a first-stage coalbed methane well output contribution rate testing and grading device and a second-stage coalbed methane well output contribution rate testing and grading device, the coalbed methane well penetrates through the two coalbeds and respectively comprises a first-stage coalbed layer and a second-stage coalbed layer, the first-stage coalbed layer is below the first-stage coalbed layer and above the first-stage coalbed layer, the second-stage coalbed layer is below the second-stage coalbed layer and above the second-stage coalbed layer, the first-stage coalbed methane well output contribution rate testing and grading device penetrates through the first-stage coalbed layer, the upper end of the first-stage coalbed methane well output contribution rate testing and grading device is located in the second-stage stratum, the lower end, the upper end of the secondary coal-bed gas well output contribution rate testing grading device is located in the third-level stratum, and the lower end of the secondary coal-bed gas well output contribution rate testing grading device is located in the second-level stratum.

3. The multi-coalbed gas well production contribution rate test grading device as claimed in claim 2, wherein a longitudinal gas-water separation blocking net is arranged inside the gas conveying pipe and below the gas flowmeter.

4. The multi-coalbed methane well output contribution rate testing and grading device as claimed in any one of claims 1 to 3, wherein the sealing adjustment mechanism comprises an annular fixing plate fixedly connected with the coalbed mining buffer tank, an outward-turned edge is arranged above the annular fixing plate, the sealing leather cup comprises an upper leather cup and a lower leather cup, the upper leather cup and the lower leather cup are both fixed at the edge of the annular fixing plate by screws, a plurality of rectangular grooves are uniformly distributed in an annular shape are arranged on the side surface of the annular fixing plate, a small hydraulic cylinder is fixed at the upper end surface of each rectangular groove, a telescopic rod of each small hydraulic cylinder is connected with a guide rod, a pressure spring fixedly connected with the guide rod is arranged below the outer side of the guide rod, a sliding seat positioned above the pressure spring is penetrated by the guide rod, a reducing push rod is hinged to the sliding seat, and the annular fixing plate is provided with a fixing seat fixed above the rectangular groove, the fixing base is hinged with a roller connecting rod, the tail end of the roller connecting rod is forked and is connected with a reducing roller through a pin shaft, the reducing roller is uniformly distributed below the lower-layer leather cup, a groove is formed below the roller connecting rod, and the upper end of a reducing push rod is located in the groove of the roller connecting rod.

5. The multi-coalbed methane well output contribution rate testing and grading device as claimed in claim 4, wherein the upper leather cup and the lower leather cup are both made of magnetic bodies compounded by rubber and magnetic materials, the gas-water mixing conveying main pipe is made of steel, and the upper leather cup and the lower leather cup are both attached to the gas-water mixing conveying main pipe in a sealing mode.

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