CN111305837B - Device and method for measuring content of shocking closed core-taking gas - Google Patents
Device and method for measuring content of shocking closed core-taking gas Download PDFInfo
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- CN111305837B CN111305837B CN202010158537.6A CN202010158537A CN111305837B CN 111305837 B CN111305837 B CN 111305837B CN 202010158537 A CN202010158537 A CN 202010158537A CN 111305837 B CN111305837 B CN 111305837B
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000005553 drilling Methods 0.000 claims abstract description 109
- 238000003795 desorption Methods 0.000 claims abstract description 16
- 239000003245 coal Substances 0.000 claims description 40
- 238000007789 sealing Methods 0.000 claims description 39
- 229910000831 Steel Inorganic materials 0.000 claims description 37
- 239000010959 steel Substances 0.000 claims description 37
- 239000000725 suspension Substances 0.000 claims description 31
- 230000005540 biological transmission Effects 0.000 claims description 15
- 230000005484 gravity Effects 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 9
- 238000005070 sampling Methods 0.000 claims description 6
- 238000004458 analytical method Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 5
- 238000004146 energy storage Methods 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 238000003556 assay Methods 0.000 claims 1
- 230000035939 shock Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 5
- 238000000605 extraction Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/02—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells by mechanically taking samples of the soil
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors
- E21B25/10—Formed core retaining or severing means
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Soil Sciences (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a device and a method for measuring the content of jar-shocking closed coring gas, wherein the device for measuring the content of the jar-shocking closed coring gas comprises a drilling coring external system, a coring closed internal system, a feeder capable of feeding the coring closed internal system into the drilling coring external system and a jar-shocking fishing assembly; the drilling coring operation can be completed by the matching of the coring closed inner system and the drilling coring outer system, and the drilling closed inner system and the coring closed inner system can be completed by the matching of the jarring salvaging assembly and the coring closed inner system, and the content of the desorption gas of the sample can be determined by salvaging the core in the ground. The invention has high closed coring efficiency, ensures the integrity of the sample and can effectively improve the determination precision of the content of the analytic gas.
Description
Technical Field
The invention belongs to the technical field of coal mine safety and coal bed gas exploration and development, and particularly relates to a shock type device and method for measuring content of ground closed coring gas.
Background
The content of the coal bed gas is an important parameter for representing the characteristics of a coal reservoir and is an important basis for estimating the coal bed gas resources, predicting the productivity and designing the well pattern arrangement; it is also an important index for characterizing the danger degree of the mine gas. The practice of coal mine production and coal bed gas development shows that the gas content is tested by adopting a desorption method during the exploration of coal bed gas resources and the geological exploration of a coal field, and the test result is obviously lower than the actual gas content in the coal bed. The test gas content of the gas-liquid separator consists of three parts of loss gas content, desorption gas content and residual gas content. The analysis considers that the causes of the low content test of the coal bed gas are mainly that the coal and the core tube are mostly open or semi-closed in the traditional coring method, the obtained coal core is lifted to the ground from the bottom of the well, and the coal bed is exposed in the process of coring from the core tube and filling into a coal bed gas desorption tank on the ground, so that a large amount of gas is dissipated, and the estimation of the content of the lost gas is inaccurate; the method is characterized in that the measurement accuracy of the content of the coal bed gas on the ground is improved, the coring time and the exposure time of the coal core are required to be shortened, so that the gas loss in the coring process is reduced to the maximum extent, the closed coring equipment can keep the integrity of the lithology in the coring process of the coal bed, can completely close the coal core, prevents the coal bed gas from escaping, is combined with rope coring, and can complete the coring work quickly and simply. The mechanical type of the ground closed coring equipment which is researched and reported mainly adopts a power spring to provide core cutting power or adopts hydraulic pushing to provide a power mechanism to realize sealing in a matching way, and a special force application mechanism is required; in addition, the service life of the spring is limited by repeated loading, and the service life of the dynamic seal pushed by hydraulic pressure is difficult to guarantee except for needing a matched hydraulic system.
Disclosure of Invention
Aiming at the defects and shortcomings in the prior art, the invention provides a device and a method for measuring the content of gas generated by closed core extraction through shock, so as to overcome the defects.
In order to achieve the purpose, the invention adopts the following technical scheme:
a device for measuring the content of jar-shocked closed coring gas comprises a drilling coring external system, a coring closed internal system, a feeder capable of feeding the coring closed internal system into the drilling coring external system and a jar-shocking fishing assembly;
the drilling coring external system comprises a coring outer barrel, a positioning hole arranged on the inner wall of the upper part of the coring outer barrel, an upper valve closing clamping table arranged on the inner wall of the middle upper part of the coring outer barrel, a lower valve closing clamping table arranged on the inner wall of the middle lower part of the coring outer barrel and an outer barrel coring drill bit which is arranged at the lower end of the coring outer barrel and is coaxial with the coring outer barrel;
the coring closed internal system comprises a coring internal cylinder, a suspension positioner arranged at the upper end of the coring internal cylinder, an embedded one-way exhaust analysis valve arranged at the upper part of the coring internal cylinder, an internal cylinder coring bit arranged at the lower end of the coring internal cylinder, an upper sealing ball valve and a lower sealing ball valve arranged on the coring internal cylinder, and a coal stopping hoop which is positioned above the lower sealing ball valve and is arranged in the coring internal cylinder; the hanging positioner can pop out a positioning pin key to be clamped into a positioning hole so as to hang and fix the coring closed internal system in the drilling coring external system, the inner cylinder coring bit can rotate along with the outer cylinder coring bit, and the coring inner cylinder does not rotate along with the drilling coring external system, so that the coring closed internal system is matched with the drilling coring external system to complete drilling coring; the upper part of the suspension positioner can be connected with a feeder or a jarring fishing assembly in a hanging manner;
the jarring fishing assembly comprises a jarring weighting seat and a jarring fishing cap connected below the jarring weighting seat through an energy storage safety spring; the jarring fishing cap can lock the hanging positioner and enable the hanging positioner to be hung with the drilling coring external system, and the jarring weighting seat can jar the jarring fishing cap to enable the coring closed internal system to descend, so that the upper sealing ball valve and the lower sealing ball valve are closed through the upper closing valve clamping table and the lower closing valve clamping table to achieve closed coring, and the jarring fishing assembly can be used for fishing the coring closed internal system.
The invention also comprises the following technical characteristics:
specifically, the suspension positioner comprises an upper cavity, a lower cavity, a clamping groove arranged at the top of the upper cavity, a salvaging and releasing key arranged in the upper cavity, a twisted cross transmission connecting rod and a positioning pin key arranged in the lower cavity; the opening of the clamping groove is smaller than the width of the section in the groove so as to realize hanging connection with the feeder;
the two salvaging and unlocking keys can horizontally penetrate through two sides of the upper cavity and are symmetrically arranged; the two positioning pin keys can horizontally penetrate through two sides of the lower cavity, are symmetrically distributed and are positioned in the same vertical plane with the two salvaging and releasing key keys; a horizontal positioning pin spring is arranged between the two positioning pins, so that the positioning pins are in a pop-up state in a normal state;
the upper ends of two connecting rods at the upper part of the twisted-pair cross-shaped transmission connecting rod are respectively connected with two salvaging and unfreezing keys in a sliding way; the lower ends of two connecting rods at the lower part of the twisted-pair cross transmission connecting rod are respectively connected with two positioning pin keys in a sliding way; the double-twisted cross transmission connecting rod enables the fishing unlocking key and the positioning pin key to be linked.
In the jarring fishing assembly, a through hole is formed in the upper end of the jarring weighting seat to be connected with a steel wire rope, and a safety rope is connected between the jarring weighting seat and the jarring fishing cap; the jarring fishing cap is of a cap-shaped structure with a downward opening, two L-shaped fishing pin keys are symmetrically arranged on the cap opening, the fishing pin keys are in a state of closing the cap opening in a normal state by means of gravity, namely two vertical rods of the two fishing pin keys are parallel, and two cross rods are horizontal and positioned between the two vertical rods; the fishing pin key can rotate for 90 degrees around the fishing pin key and the cap opening connecting shaft;
when the upper cavity of the hanging positioner enters the jarring fishing cap, the jarring fishing cap can limit the two fishing releasing keys to be close to each other, and the two positioning pin keys are also close to each other and separated from the positioning holes under the driving of the twisted-pair cross transmission connecting rod, so that the hanging positioner is released from the coring outer barrel.
Specifically, the feeder comprises an elastic clamping hook and an inclined opening releasing clamping ring;
the upper ends of the elastic clamping hooks are provided with through holes for connecting steel wire ropes, and the two clamping hooks of the elastic clamping hooks are in a normally open state and can be clamped in the clamping grooves; the inclined opening releasing clamp ring can be sleeved with a steel wire rope through the inclined opening and slide to the elastic clamping hooks by utilizing gravity to enable the two clamping hooks to retract and then be released from the clamping groove.
Specifically, the upper end of the coring outer cylinder is provided with a coring drill tool interface which is used for being connected with a matched inner drift diameter drill rod; the lower end of the coring outer barrel is connected with the coring drill bit of the outer barrel through a thread; the inner wall of the upper part of the coring outer barrel is provided with a limiting slideway so as to realize the guiding of the coring closed inner system; a positioning boss positioned on the inner wall of the coring outer barrel is arranged below the limiting slide way, and the positioning hole is formed in the positioning boss so as to realize the fixed suspension of the coring closed inner system;
an anti-impact backing ring is arranged at the joint of the coring outer barrel and the coring drill bit of the outer barrel, and is provided with an axial through hole and is communicated with a drill bit waterway in the coring drill bit of the outer barrel so as to circulate drilling fluid;
the upper valve closing clamping table and the lower valve closing clamping table are both annular bosses on the inner wall of the coring outer barrel; the inner wall of the outer barrel coring bit is provided with a clamping groove which can be matched with a boss of the inner barrel coring bit so as to drive the inner barrel coring bit to rotate together to cut a coal seam at the bottom of a hole.
Specifically, the coring closed inner system can penetrate through an inner drift diameter drill rod arranged at the upper end of the drilling coring outer system to enter the drilling coring outer system;
the coring inner cylinder is connected with the inner cylinder coring bit through an inner cylinder bearing, and the coring inner cylinder is connected with the suspension positioner through a suspension bearing, so that the coring inner cylinder does not rotate along with a drilling coring external system in the coring drilling process, and a sample entering the coring inner cylinder is kept complete to the maximum extent;
the outer wall of the coring inner cylinder below the lower sealing ball valve is provided with a falling-stopping limit pin, and the falling-stopping limit pin and the anti-impact backing ring are matched to limit the falling limit position of the coring closed inner system, so that the protection effect is achieved.
Specifically, when the coring closed inner system is suspended and fixed in the drilling coring outer system, the upper sealing ball valve is close to and above the upper valve closing clamping table, and the lower sealing ball valve is close to and above the lower valve closing clamping table.
The invention also provides a method for measuring the content of the shocking closed coring gas, which comprises the steps of conventionally drilling by adopting a drilling coring external system, feeding the coring closed internal system into the drilling coring external system through an internal drift diameter drill rod during coring, then carrying out coring drilling operation, lifting the drilling coring external system for a certain distance after coring is finished, feeding the drilling coring external system into a shocking salvage assembly, closing the upper closed ball valve and the lower closed ball valve through the shocking action of the shocking salvage assembly, salvaging the coring closed internal system to the ground, connecting the upper closed ball valve and the lower closed ball valve with a desorption instrument, and carrying out gas content desorption measurement of closed sampling.
The method specifically comprises the following steps:
step 1, drilling a target coal seam by adopting a drilling coring external system, before coring operation is started, firstly checking whether the air tightness of a coring inner cylinder of a coring closed internal system and a positioning pin key of a suspension positioner are reset, then opening an upper sealing ball valve of the coring inner cylinder and a lower sealing ball valve of the inner cylinder, and connecting the coring closed internal system with a feeder;
step 5, lifting the shock-absorbing fishing assembly by using a steel wire rope, fishing the locked coring closed internal system to the ground, connecting the coring closed internal system with a desorption instrument, and performing gas content desorption measurement of closed sampling;
and 6, repeating the steps to perform closed coring operation and gas content measurement again.
Compared with the prior art, the invention has the beneficial technical effects that:
1. the core-taking closed inner system can be matched with a drilling core-taking outer system to complete drilling core-taking operation, the jarring fishing assembly can be matched with the core-taking closed inner system to complete core-taking closed and core-taking closed inner system fishing operation, and the core-taking closed inner system fishing assembly is fished to the ground to measure the content of desorbed gas of a sample, so that the core-taking efficiency is high, the integrity of the sample is ensured, and the analytic gas content measurement precision can be effectively improved.
2. When the coring closed internal system is sent into the drilling coring external system for coring, the expanded elastic clamping hook of the feeder is connected with the suspension positioner, the inclined opening clamping ring is sleeved into the steel wire rope after the steel wire rope is simultaneously lowered to the target coal seam depth at the bottom of the hole, the inclined opening clamping ring is lowered to the expanded elastic clamping hook along with gravity, the expanded elastic clamping hook is contracted, the internal system feeder is separated from the suspension positioner, the lowering of the coring closed internal system is completed, and the lowering method is simple and easy to realize, and is safe and reliable in operation.
3. The drill rod and the drill bit are integrally lifted for a certain distance after the drilling is stopped, the coal core is broken by the coal stopping hoop, the closed core gas content measuring device is kept a certain distance away from the bottom of the hole, and the operation is simple and easy to realize.
4. When the invention is used for jar salvaging the coring closed internal system, the steel wire rope and the jar salvaging assembly are lowered, and the jar salvaging assembly is ensured to lock the coring closed internal system and disconnect the coring closed internal system and the drilling coring external system by lifting and lowering the jar aggravating seat, and simultaneously, the upper sealing ball valve and the lower sealing ball valve of the coring closed internal system are completely closed.
5. The invention can realize double-cylinder single-action to ensure the integrity of the core, and the suspension bearing of the suspension positioner and the inner cylinder bearing of the inner cylinder of the coring device in the coring closed inner system ensure that the coring inner cylinder does not rotate along with the coring outer cylinder, thereby keeping the integrity of the sample.
Drawings
FIG. 1 is a block diagram of a coring enclosed internal system suspended within a drilling coring external system;
FIG. 2 (base:Sub>A) isbase:Sub>A cross-sectional view A-A of the extracore drilling system; (b) isbase:Sub>A section A-A of the coring closed internal system;
fig. 3 (a) is a schematic diagram of the elastic hook of the feeder, (b) is a front view of the oblique-opening releasing ring, and (c) is a top view of the oblique-opening releasing ring; (d) The oblique opening release snap ring of the feeder is sleeved on the elastic hook to close the elastic hook;
FIG. 4 is a schematic view of the elastic hook of the feeder being hooked with the hanging positioner;
fig. 5 is a schematic view of the inclined-opening releasing ring of the feeder being sleeved on the elastic hook to release the elastic hook from the hanging positioner;
FIG. 6 is a jarring principle diagram of jar salvaging assembly salvaging, wherein, (a) is a schematic diagram that two salvaging pin keys of the jar salvaging cap rotate by the upward thrust of two salvaging releasing keys; (b) The upper cavity of the hanging positioner enters the jar salvaging cap and is locked in the jar salvaging cap; (c) The shock fishing cap is shocked when the shock weighting base falls;
FIG. 7 is a schematic cross-sectional view of the jarring fishing assembly jarring to close the upper and lower sealing ball valves of the coring enclosed internal system;
FIG. 8 is a diagram of the process of using the impact type apparatus for measuring the content of the gas in the ground closed core, wherein (a) is drilling before core extraction, (b) is feeding into the closed core system, (c) is lifting the whole apparatus after core extraction is completed, and (d) is closing the upper sealing ball valve and the lower sealing ball valve by impact.
In the figure, the reference numbers are 1-drilling coring external system, 2-coring closed internal system, 3-feeder and 4-jarring fishing assembly;
11-coring outer cylinder, 12-positioning hole, 13-upper valve closing clamping table, 14-lower valve closing clamping table, 15-outer cylinder coring bit, 16-limiting slide way, 17-positioning boss and 18-anti-impact backing ring;
21-coring inner cylinder, 22-hanging positioner, 23-embedded one-way exhaust analysis valve, 24-inner cylinder coring bit, 25-upper sealing ball valve, 26-lower sealing ball valve, 27-coal stopping hoop and 28-falling stopping limit pin; 221-upper cavity, 222-lower cavity, 223-clamping groove, 224-fishing unlocking key, 225-twisted cross transmission connecting rod, 226-positioning pin key and 227-positioning pin key spring;
31-elastic hook, 32-inclined opening release clasp;
41-a jarring weighting seat, 42-an energy storage safety spring, 43-a jarring fishing cap, 44-a safety rope and 45-a fishing pin key.
The invention is described in detail below with reference to the drawings and the detailed description.
Detailed Description
The present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention fall within the protection scope of the present invention. The present invention will be described in further detail with reference to examples.
Example 1:
as shown in fig. 1 to 7, the present embodiment provides a jar closed coring gas content measuring device, which includes a drilling coring external system 1, a coring closed internal system 2, a feeder 3 capable of feeding the coring closed internal system 2 into the drilling coring external system 1, and a jar salvage assembly 4; the coring closed inner system 2 is matched with the coring outer system 1 to complete the coring operation of drilling, and the jarring fishing assembly 4 is matched with the coring closed inner system 2 to complete the fishing operation of the coring closed and coring closed inner system 2, and the pumping assembly is fished to the ground to measure the content of desorbed gas of a sampled article. The drilling coring external system 1 comprises a coring outer cylinder 11, a positioning hole 12 arranged on the inner wall of the upper part of the coring outer cylinder 11, an upper valve closing clamping table 13 arranged on the inner wall of the middle upper part of the coring outer cylinder 11, a lower valve closing clamping table 14 arranged on the inner wall of the middle lower part of the coring outer cylinder 11 and an outer cylinder coring bit 15 which is arranged at the lower end of the coring outer cylinder 11 and is coaxial with the coring outer cylinder 11. The coring closed internal system 2 comprises a coring internal cylinder 21, a suspension positioner 22 arranged at the upper end of the coring internal cylinder 21, an embedded one-way exhaust analysis valve 23 arranged at the upper part of the coring internal cylinder 21, an internal cylinder coring bit 24 arranged at the lower end of the coring internal cylinder 21, an upper sealing ball valve 25 and a lower sealing ball valve 26 arranged on the coring internal cylinder 21, and a coal stopping hoop 27 which is positioned above the lower sealing ball valve 25 and is arranged in the coring internal cylinder 21; the suspension positioner 22 can pop out the positioning pin key 226 to be clamped into the positioning hole 12 so as to suspend and fix the coring closed internal system 2 in the drilling coring external system 1, the internal cylinder coring bit 24 can rotate along with the external cylinder coring bit 15, and the coring internal cylinder 21 does not rotate along with the drilling coring external system 1, so that the coring closed internal system 2 is matched with the drilling coring external system 1 to complete drilling coring; the upper part of the hanging positioner 22 can be connected with the feeder 3 or the jarring fishing assembly 4 in a hanging way; the jarring fishing assembly 4 comprises a jarring weighting seat 41 and a jarring fishing cap 43 connected below the jarring weighting seat 41 through an energy storage safety spring 42; the jarring fishing cap 43 can lock the hanging positioner 22 and enable the hanging positioner to be hung on the drilling coring external system 1, and the jarring weighting seat 41 can jar the jarring fishing cap 43 to enable the coring closed internal system 2 to descend, so that the upper sealing ball valve 25 and the lower sealing ball valve 26 are closed through the upper closing valve clamping table 13 and the lower closing valve clamping table 14 to achieve closed coring, and the coring closed internal system 2 can be fished through the jarring fishing assembly 4.
In this embodiment, the suspension positioner 22 of the coring enclosed internal system 2 includes an upper cavity 221, a lower cavity 222, a clamping groove 223 disposed at the top of the upper cavity 221, a fishing and unlocking key 224 disposed in the upper cavity 221, a twisted cross transmission link 225, and a positioning pin key 226 disposed in the lower cavity 222; specifically, the upper cavity 221 and the lower cavity 222 are communicated through a neck; and the lower part of the upper cavity body is provided with a necking, and the outer diameter of the neck part is smaller than that of the upper cavity body, so that the two fishing pin keys have enough rotating space to realize 90-degree rotation. The opening of the clamping groove 223 is smaller than the width of the section in the groove so as to realize hanging connection with the feeder 3; the number of the salvaging releasing keys 224 is two, and the two salvaging releasing keys 224 can horizontally penetrate through two sides of the upper cavity 221 and are symmetrically distributed; two positioning pin keys 226 are provided, and the two positioning pin keys 226 can horizontally penetrate through two sides of the lower cavity 222 and are symmetrically arranged and are positioned in the same vertical plane with the two salvaging releasing keys 224; a horizontal positioning pin spring 227 is arranged between the two positioning pin keys 226, so that the positioning pin keys 226 are in a pop-up state in a normal state; the upper ends of two connecting rods at the upper part of the twisted-pair cross-shaped transmission connecting rod 225 are respectively connected with two salvaging releasing keys 224 in a sliding way; the lower ends of two lower connecting rods of the twisted cross transmission connecting rod 225 are respectively connected with two positioning pin keys 226 in a sliding way; a twisted pair cross drive link 225 links the fishing trip key 224 and the locating pin key 226.
In the jar salvaging assembly 4, the upper end of the jar weighting seat 41 is provided with a through hole for connecting a steel wire rope, and a safety rope 44 is connected between the jar weighting seat 41 and the jar salvaging cap 43; the jarring fishing cap 43 is of a cap-shaped structure with a downward opening, two L-shaped fishing pin keys 45 are symmetrically arranged at the cap opening, the fishing pin keys 45 are in a state of closing the cap opening normally by means of gravity, namely two vertical rods of the two fishing pin keys 45 are parallel, and two cross rods are horizontal and positioned between the two vertical rods; the fishing pin key 45 can rotate for 90 degrees around the connecting shaft of the fishing pin key and the cap opening; when the cavity 221 on the hanging positioner 22 enters the jarring fishing cap 43, the jarring fishing cap 43 can limit the two fishing unlocking keys 224 to be close to each other, and the two positioning pin keys 226 are also close to each other and separated from the positioning holes 12 under the driving of the twisted cross transmission connecting rod 225, so that the hanging positioner 22 is hung off from the coring outer barrel 11.
The working principle of the jarring fishing assembly is as follows: as shown in fig. 6, when the jarring salvaging assembly moves downwards, the two salvaging pin keys of the jarring salvaging cap are pushed upwards by the two salvaging release keys, the two salvaging pin keys rotate to be attached to the inner wall of the cap opening so as to open the cap opening, so that the upper cavity of the suspension locator enters the jarring salvaging cap, and then the two salvaging pin keys rotate and reset by gravity to be in a state of closing the cap opening so as to lock the upper cavity in the jarring salvaging cap; meanwhile, the two salvaging and releasing keys are squeezed by the jarring salvaging cap to mutually approach, and the two positioning pin keys mutually approach and are separated from the positioning holes under the driving of the double-twisted cross transmission connecting rod, so that the suspension positioner and the coring outer barrel are released; the rear shock weighting seat falls to perform a shock action on the shock fishing cap, the shock fishing cap is instantaneously released for secondary shock after a set distance is set by lifting the steel wire rope, the shock fishing assembly performs a plurality of shock actions to enable the coring closed internal system to fully descend, the upper closed ball valve and the lower closed ball valve of the coring closed internal system and the upper valve closing clamping table and the lower valve lowering clamping table of the drilling coring external system generate enough relative movement, and the upper closed ball valve and the lower closed ball valve are closed; the fishing of the coring closed internal system is realized by lifting the steel wire rope.
The feeder 3 in this embodiment includes an elastic hook 31 and an oblique-opening releasing ring 32; the upper ends of the elastic hooks 31 are provided with through holes for connecting steel wire ropes, and two hooks of the elastic hooks 31 are in a normally open state and can be clamped in the clamping grooves 223; the bevel opening release ring 32 can be sleeved with a steel wire rope through the bevel opening and slide to the elastic hooks 31 by gravity to enable the two hooks to retract and then be released from the clamping groove 223. The bevel opening design on the bevel opening release snap ring 32 can prevent the bevel opening release snap ring 32 from being separated from the steel wire rope in the sliding process, and the releasing of the feeder 3 and the hanging positioner 22 can be realized more efficiently.
The working principle of the feeder 3 is as follows: as shown in fig. 4 and 5, when the coring closed internal system 2 needs to be lowered, the open elastic hook 31 is connected with the hanging positioner 22, the steel wire rope is together lowered into the positioning hole of the positioning boss of the coring external system for fixing and hanging, then the inclined opening release ring is sleeved into the steel wire rope, the steel wire rope is lowered to the open elastic hook 31 along with gravity, the open elastic hook 31 is contracted, the feeder 3 releases the hanging positioner 22, the steel wire rope is recovered and lifted up and the feeder 3 is lifted to the ground, and the lowering of the coring closed internal system 2 is finished.
In the drilling coring external system 1, the upper end of a coring outer cylinder 11 is a coring drill tool interface which is used for connecting with a matched inner drift diameter drill rod; the lower end of the coring outer barrel 11 is connected with the outer barrel coring bit 15 through a thread; a limiting slide way 16 is arranged on the inner wall of the upper part of the coring outer barrel 11 to realize the guiding of the coring closed inner system; a positioning boss 17 positioned on the inner wall of the coring outer barrel 11 is arranged below the limiting slide way 16, and a positioning hole 12 is arranged on the positioning boss 17 to realize the fixed suspension of the coring closed inner system 1; an anti-impact backing ring 18 is arranged at the joint of the outer barrel 11 and the outer barrel core bit 15, and the anti-impact backing ring 18 is provided with an axial through hole and is communicated with a bit waterway in the outer barrel core bit 15 for the circulation of drilling fluid; the upper valve closing clamping table 13 and the lower valve closing clamping table 14 are both annular bosses on the inner wall of the coring outer barrel; the inner wall of the outer barrel coring bit 15 is provided with a clamping groove which can be matched with a boss of the inner barrel coring bit 24 so as to drive the inner barrel coring bit 24 to rotate together to cut a coal seam at the bottom of a hole.
The coring closed inner system 2 can penetrate through an inner drift diameter drill rod arranged at the upper end of the drilling coring outer system 1 to enter the drilling coring outer system 1; the inner core barrel 21 is connected with the inner barrel core bit 24 through an inner barrel bearing, and the inner core barrel 21 is connected with the suspension positioner 22 through a suspension bearing, so that the inner core barrel 21 does not rotate along with the core drilling and coring external system 1 in the core drilling process, and the integrity of a sample entering the inner core barrel 21 is kept to the maximum extent; the outer wall of the coring inner cylinder 21 below the lower sealing ball valve 25 is provided with a falling-stopping limit pin 28, and the falling-stopping limit pin 28 and the anti-impact backing ring 18 are matched to limit the falling limit position of the coring closed inner system 2, so that the protection effect is achieved.
In this embodiment, the in-line one-way vent valve 23 is vented and can be used to communicate with the analytical equipment.
The coal stopping hoop 27 can enable a coal sample which is drilled and taken to be stored in the core inner barrel 21, and the effects of breaking the coal core and preventing the falling of the internal coal sample can be achieved in the process of lifting the drilling tool.
When the coring closed internal system 2 is suspended and fixed in the drilling coring external system 1, the upper sealing ball valve 25 is adjacent to and above the upper valve clamping platform 13, and the lower sealing ball valve 26 is adjacent to and above the lower valve clamping platform 14. So that the upper closed ball valve and the lower closed ball valve of the coring closed inner system and the upper valve closing clamping table and the lower valve closing clamping table of the drilling coring outer system can generate enough relative movement to close the upper closed ball valve and the lower closed ball valve to complete the sealing of the drilling coring through repeated jarring of the jarring fishing assembly.
Example 2:
as shown in fig. 8, in this embodiment, a method for determining the content of a shocking closed coring gas is provided, in which a drilling coring external system is used for conventional drilling, a feeder is used for feeding a coring closed internal system into the drilling coring external system through an inner drift diameter drill rod during coring, then coring drilling operation is performed, after coring is completed, the drilling coring external system is lifted a certain distance and is fed into a shocking fishing assembly, an upper closed ball valve and a lower closed ball valve are closed under the shocking action of the shocking fishing assembly, the coring closed internal system is fished to the ground and then is connected with a desorption instrument, and desorption determination of the gas content in closed sampling is performed.
The method specifically comprises the following steps:
step 1, drilling a target coal seam by adopting a drilling coring external system, before coring operation is started, firstly checking whether the air tightness of a coring inner cylinder of a coring closed internal system and a positioning pin key of a suspension positioner are reset, then opening an upper sealing ball valve of the coring inner cylinder and a lower sealing ball valve of the inner cylinder, and connecting the coring closed internal system with a feeder;
step 5, lifting the shock-absorbing fishing assembly by using a steel wire rope, fishing the locked coring closed internal system to the ground, connecting the coring closed internal system with a desorption instrument, and performing gas content desorption measurement of closed sampling;
and 6, repeating the steps to perform closed coring operation and gas content measurement again.
Claims (9)
1. A jar closed coring gas content measuring device is characterized by comprising a drilling coring external system (1), a coring closed internal system (2), a feeder (3) capable of feeding the coring closed internal system (2) into the drilling coring external system (1) and a jar salvage assembly (4);
the drilling coring external system (1) comprises a coring external cylinder (11), a positioning hole (12) arranged on the inner wall of the upper part of the coring external cylinder (11), an upper closing valve clamping table (13) arranged on the inner wall of the middle upper part of the coring external cylinder (11), a lower closing valve clamping table (14) arranged on the inner wall of the middle lower part of the coring external cylinder (11) and an external cylinder coring bit (15) which is arranged at the lower end of the coring external cylinder (11) and is coaxial with the coring external cylinder (11);
the coring closed internal system (2) comprises a coring internal cylinder (21), a suspension positioner (22) arranged at the upper end of the coring internal cylinder (21), an embedded one-way exhaust analysis valve (23) arranged at the upper part of the coring internal cylinder (21), an internal cylinder coring drill bit (24) arranged at the lower end of the coring internal cylinder (21), an upper sealing ball valve (25) and a lower sealing ball valve (26) arranged on the coring internal cylinder (21), and a coal stopping hoop (27) which is positioned above the lower sealing ball valve (25) and is arranged in the coring internal cylinder (21); the suspension positioner (22) can eject a positioning pin key (226) to be clamped into the positioning hole (12) to suspend and fix the coring closed inner system (2) in the drilling coring outer system (1), the inner cylinder coring bit (24) can rotate along with the outer cylinder coring bit (15) and the coring inner cylinder (21) does not rotate along with the drilling coring outer system (1), so that the coring closed inner system (2) is matched with the drilling coring outer system (1) to complete drilling coring; the upper part of the hanging positioner (22) can be connected with the feeder (3) or the jarring fishing assembly (4) in a hanging way;
the jarring fishing assembly (4) comprises a jarring weighting seat (41) and a jarring fishing cap (43) connected below the jarring weighting seat (41) through an energy storage safety spring (42); the jarring fishing cap (43) can lock the hanging positioner (22) and enable the hanging positioner to be hung on the drilling coring external system (1) in an unlocking mode, and the jarring weighting base (41) can jar the jarring fishing cap (43) to enable the coring closed internal system (2) to descend, so that the upper sealing ball valve (25) and the lower sealing ball valve (26) are closed through the upper valve closing clamping table (13) and the lower valve closing clamping table (14) to achieve closed coring, and the coring closed internal system (2) can be fished through the jarring fishing assembly (4).
2. The jar closed coring gas content determining apparatus of claim 1, wherein the hanging positioner (22) comprises an upper cavity (221), a lower cavity (222), a slot (223) provided at a top of the upper cavity (221), a salvage release key (224) provided in the upper cavity (221), a double twisted cross drive link (225), and the locating pin key (226) provided in the lower cavity (222); the opening of the clamping groove (223) is smaller than the width of the section in the groove so as to realize hanging connection with the feeder (3);
the number of the salvaging and releasing keys (224) is two, and the two salvaging and releasing keys (224) can horizontally penetrate through the two sides of the upper cavity (221) and are symmetrically arranged; the number of the positioning pin keys (226) is two, and the two positioning pin keys (226) can horizontally penetrate through two sides of the lower cavity (222), are symmetrically distributed and are positioned in the same vertical plane with the two salvaging and releasing keys (224); a horizontal positioning pin spring (227) is arranged between the two positioning pin keys (226), so that the positioning pin keys (226) are in a pop-up state in a normal state;
the upper ends of two connecting rods at the upper part of the twisted pair cross transmission connecting rod (225) are respectively connected with two salvaging and releasing keys (224) in a sliding way; the lower ends of two connecting rods at the lower part of the twisted-pair cross transmission connecting rod (225) are respectively connected with two positioning pin keys (226) in a sliding way; the double-twisted cross transmission link (225) enables the fishing unlocking key (224) and the locating pin key (226) to be linked.
3. The jar closed coring gas content measuring device as set forth in claim 2, wherein in the jar salvaging assembly (4), a through hole is arranged at the upper end of the jar weighting seat (41) to connect with a steel wire rope, and a safety rope (44) is connected between the jar weighting seat (41) and the jar salvaging cap (43);
the jarring fishing cap (43) is of a cap-shaped structure with an opening facing downwards, two L-shaped fishing pin keys (45) are symmetrically arranged at the cap opening, the fishing pin keys (45) are in a state of closing the cap opening normally by means of gravity, namely two vertical rods of the two fishing pin keys (45) are parallel, and two cross rods are horizontal and located between the two vertical rods; the salvaging pin key (45) can rotate for 90 degrees around the connection shaft of the salvaging pin key and the cap opening;
when the upper cavity (221) of the hanging positioner (22) enters the jarring fishing cap (43), the jarring fishing cap (43) can limit the two fishing unlocking keys (224) to be close to each other, and the two positioning pin keys (226) are also close to each other and separated from the positioning holes (12) under the drive of the twisted cross transmission connecting rod (225) to realize the hanging of the hanging positioner (22) and the coring outer barrel (11).
4. The apparatus for determining the content of the hermetically sealed coring gas in accordance with claim 2, wherein the feeder (3) comprises a snap hook (31) and a beveled snap ring (32);
the upper end of the elastic clamping hook (31) is provided with a through hole for connecting a steel wire rope, and two clamping hooks of the elastic clamping hook (31) are in a normally open state and can be clamped in the clamping groove (223); the bevel opening release ring (32) can be sleeved with a steel wire rope through the bevel opening and slides down to the elastic hooks (31) by utilizing gravity to enable the two hooks to retract and then be released from the clamping groove (223).
5. The jar closed coring gas content determining device as set forth in claim 1, wherein the upper end of the coring outer cylinder (11) is a coring drill interface for connecting with a matching inner drift diameter drill rod; the lower end of the coring outer barrel (11) is connected with a coring drill bit (15) of the outer barrel through a thread;
a limiting slide way (16) is arranged on the inner wall of the upper part of the coring outer barrel (11) to realize the guiding of the coring closed inner system; a positioning boss (17) positioned on the inner wall of the coring outer barrel (11) is arranged below the limiting slide way (16), and the positioning hole (12) is formed in the positioning boss (17) to realize the fixed suspension of the coring closed inner system (1);
an anti-impact backing ring (18) is arranged at the joint of the coring outer barrel (11) and the coring drill bit (15) of the outer barrel, an axial through hole is formed in the anti-impact backing ring (18), and the anti-impact backing ring is communicated with a drill bit waterway in the coring drill bit (15) of the outer barrel so as to allow drilling fluid to circulate;
the upper valve closing clamping table (13) and the lower valve closing clamping table (14) are both annular bosses on the inner wall of the coring outer barrel; the inner wall of the outer barrel coring bit (15) is provided with a clamping groove which can be matched with a boss of the inner barrel coring bit (24) so as to drive the inner barrel coring bit (24) to rotate together to cut a coal seam at the bottom of a hole.
6. The jar closed core gas assay device according to claim 5 wherein the core closed inner system (2) is capable of entering the drilling core outer system (1) through an inner bore drill pipe mounted at the upper end of the drilling core outer system (1);
the coring inner cylinder (21) is connected with the inner cylinder coring bit (24) through an inner cylinder bearing, and the coring inner cylinder (21) is connected with the suspension positioner (22) through a suspension bearing, so that the coring inner cylinder (21) does not rotate along with the drilling coring outer system (1) in the coring drilling process, and the integrity of a sample entering the coring inner cylinder (21) is kept to the maximum extent;
the outer wall of the coring inner cylinder (21) below the lower sealing ball valve (25) is provided with a falling-stopping limit pin (28), the falling-stopping limit pin (28) and the anti-impact backing ring (18) are matched to limit the falling limit position of the coring closed inner system (2), and the protection effect is achieved.
7. The jar closed coring apparatus of claim 5, wherein the coring closed inner system (2) is suspended and fixed in the drilling coring outer system (1) with an upper sealing ball valve (25) immediately above the upper valve closing land (13) and a lower sealing ball valve (26) immediately above the lower valve closing land (14).
8. A method for measuring gas content by adopting the jar closed coring gas content measuring device as claimed in any one of claims 1 to 7 is characterized in that a drilling coring external system is adopted for conventional drilling, a feeder is adopted to feed a coring closed internal system into the drilling coring external system through an inner drift diameter drill rod during coring, then coring drilling operation is carried out, the drilling coring external system is lifted a certain distance after coring is completed, the drilling coring external system is fed into a jar fishing assembly, an upper closed ball valve and a lower closed ball valve are closed under the action of the jar fishing assembly, the coring closed internal system is fished to the ground and then is connected with a desorption instrument, and gas content desorption measurement of closed sampling is carried out.
9. The method for determining the content of the jar closed core gas according to claim 8, comprising the steps of:
step 1, drilling a target coal seam by adopting a drilling coring external system, before coring operation is started, firstly checking whether the air tightness of a coring inner cylinder of a coring closed internal system and a positioning pin key of a suspension positioner are reset, then opening an upper sealing ball valve of the coring inner cylinder and a lower sealing ball valve of the inner cylinder, and connecting the coring closed internal system with a feeder;
step 2, the core-taking closed inner system is sent into the drilling core-taking outer system through a steel wire rope by using a feeder, positioning is completed when the core-taking closed inner system reaches a preset position, the inclined opening release clamping ring is sleeved on the steel wire rope and sinks to an elastic clamping hook of the feeder, the opened elastic clamping hook is contracted, the feeder is separated from the core-taking closed inner system, a hanging positioner is hung on the drilling core-taking outer system, and the steel wire rope is lifted to complete the lowering of the core-taking closed inner system and the hanging of the drilling core-taking outer system;
step 3, opening a slurry pump to perform coring drilling operation, stopping drilling after the coring length requirement is met, integrally lifting a drill rod and the closed coring gas content measuring device for a set distance, breaking a coal core, and keeping a distance between the closed coring gas content measuring device and the bottom of a hole;
step 4, a steel wire rope is used for lowering the jarring fishing assembly, a jarring fishing cap of the jarring fishing assembly locks a suspension positioner of the coring closed inner system to be hung on the drilling coring outer system, then the jarring weighting base falls down to jar the jarring fishing cap, and then the jarring is instantly released after the steel wire rope is lifted for a set distance to jar again; the upper closed ball valve and the lower closed ball valve of the coring closed internal system and the upper valve closing clamping table and the lower valve closing clamping table of the drilling coring external system generate enough relative movement, the upper closed ball valve and the lower closed ball valve are closed, and the drilling coring is closed;
step 5, lifting the shock-absorbing fishing assembly by using a steel wire rope, fishing the locked coring closed internal system to the ground, connecting the coring closed internal system with a desorption instrument, and performing gas content desorption measurement of closed sampling;
and 6, repeating the steps to perform closed coring operation again and measuring the gas content.
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