CN204663500U - A kind of automatic intermittent CBM Drainage aquatic products device of air - Google Patents
A kind of automatic intermittent CBM Drainage aquatic products device of air Download PDFInfo
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- CN204663500U CN204663500U CN201520364136.0U CN201520364136U CN204663500U CN 204663500 U CN204663500 U CN 204663500U CN 201520364136 U CN201520364136 U CN 201520364136U CN 204663500 U CN204663500 U CN 204663500U
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Abstract
The utility model relates to a kind of automatic intermittent CBM Drainage aquatic products device of air.Comprise the ground surface platform (5) being arranged on coal bed gas well well head, ground surface platform (5) is provided with the valve (4) for draining and exhaust and pipeline, also be provided with sealing device (3), in the sleeve pipe (6) of coal bed gas well, be provided with water pipe (7); Be connected with pump barrel (13) in the lower end of water pipe (7) by upper variable buckle (12), by lower variable buckle (14), valve mesh wire blocking component (11) be installed in the lower end of pump barrel (13); Also comprise and draw the rods (2) of rolling up and putting by draw-gear (1), rods (2) penetrates the inner chamber of pump barrel (13) via sealing device (3), is provided with pumping piston in the bottom of rods (2); Described rods (2) be wire rope at least partially.The technical program possesses cost advantage compared with draining aerogenesis apparatus of the prior art, improves productivity effect.
Description
Technical field
The utility model belongs to cbm development equipment technical field, particularly relates to a kind of automatic intermittent CBM Drainage aquatic products device of air.
Background technology
Coal bed gas refers to that being stored in coal seam take methane as main component, to be adsorbed on matrix of coal particle surface, part is free in coal hole or the hydrocarbon gas be dissolved in coal seam water, it is the associated minerals resource of coal, belonging to Unconventional forage, is the clean high-grade energy and industrial chemicals that emerge in the world in nearly ten or twenty year.Coal bed gas is commonly called as " gas ", and calorific value is 2-5 times of general coal, 1m
3the calorific value of pure coal bed gas is equivalent to 1.13kg gasoline, 1.21kg standard coal, its calorific value is suitable with natural gas, can mix defeated mixed with natural gas, and very clean after burning, producing any waste gas hardly, is first-class industry, chemical industry, generating and resident living fuel.When coal bed gas air concentration reaches 5%-16%, meeting naked light will explode, and this is the root of Gas Explosion Accidents in Coal Mines.Coal bed gas is directly discharged in air, and its greenhouse effect are about 21 times of carbon dioxide, extremely strong to environmental destruction.Therefore, in advance coal bed gas was exploited before coal mining, coal mine gas from explosion rate can not only be reduced by 70% to 85%, and clear energy sources can be obtained, produce huge economic benefit.
Coal-bed gas exploitation is fully used to ground, typical mining theory is: must reduce reservoir pressure by the means of drainage and step-down and carry out coal-bed gas exploitation, and the process of output is the process of a complicated step-down-parsing-diffusion-seepage flow.
In the recovery process of coal bed gas, it is the important guarantee that coal bed gas well individual well realizes volume production that the artesian water guaranteeing in coal seam is discharged steadily, and in coal seam, the discharge of artesian water is directly reflected in the fluctuation of coal bed gas well sleeve pipe liquid level.
Current most of coal bed gas well have employed with reference to oil exploration equipment the scheme that walking beam type water pump carries out draining, and walking beam type water pump is primarily of part compositions such as horse head, walking beam, connecting rod, crank-link mechanism, reduction box, power-equipment and auxiliary equipment.During work, the power that power-equipment exports becomes moving up and down of horse head through gearbox and crank-link mechanism, and horse head drives the plunger upward and downward of down-hole suction pump through the bar that draws water, thus constantly the water extraction pit shaft in well is bled off side by side.
But, the problems such as there is restriction in stroke jig frequency due to walking beam type water pump and energy waste is large, equipment does not match, sky is taken out, pump detection period is short, have a strong impact on the normal mining of coal bed gas well, directly reduce the returns of investment of coal bed gas, therefore become the bottleneck of coal bed gas commercialization, scale development.
Different from the continuous operation mode in oil exploitation, it is unnecessary that artesian water in coal bed gas well carries out continuously outer row, the pressure of artesian water needs the dynamic balance state keeping resolving for coal bed gas, can meet under the pattern of batch (-type) draining that maintains of above-mentioned equilibrium state, therefore adopting the bailing formula pumping equipment possessing intermittent operation mode to replace traditional walking beam type water pump becomes development trend.
So a kind of automatic intermittent CBM Drainage aquatic products device of air is disclosed in the manual of Chinese utility model patent 201420164701.4, structure comprises the sleeve pipe be arranged in well, in sleeve pipe, pump barrel is installed, the top of pump barrel is connected with tubing round thread with lower variable buckle respectively by upper variable buckle with bottom, the oil pipe of lower variable buckle bottom is connected with valve in turn, screen casing and plug, in pump barrel, aspirator is installed, aspirator comprises the elastic piston with pump barrel matched in clearance, elastic piston is fixedly linked by rods and the reciprocating drive unit driving rods to run up and down.Drive rods volume to put by reciprocating drive unit batch (-type), and then drive the elastic piston lifting of aspirator, the artesian water of coal bed gas well is extracted outer row.
Owing to being directly be applied directly in the development process of coal bed gas by interval bailing formula oil rig, therefore there is following technical characterstic in above-mentioned automatic intermittent CBM Drainage aquatic products device of air:
(1) rods adopts the body of rod of circular cross-section, i.e. wire rope outpacking rubber layer, the reliability of sealing when the ground surface platform of aboveground part arranges sealing device to ensure that rods is slided;
(2) elastic piston adopts expansion sealed piston, and concrete structure is see accompanying drawing 4; Comprise the joint pin 16 of top with connector 15, the inner of joint pin 16 is provided with tapered portion 17, center-pole 22 is connected with at the center of tapered portion 17, the outer wall of center-pole 22 offers multiple axially extended groove 23, is provided with threaded portion 24 at the other end of center-pole 22, on the body of rod of center-pole 22, be arranged with the first adapter sleeve 19, expansion sleeve 20 and the second adapter sleeve 21 successively, three adopts the mode be threaded to form an entirety, is equipped with cone tank 18 in the outer end of both the first adapter sleeve 19 and the second adapter sleeve 21.
Its course of work of elastic piston device of said structure is: when reciprocating drive unit batch (-type) drives rods volume to put, and then when driving the elastic piston of aspirator to rise, first adapter sleeve 19, the entirety that expansion sleeve 20 and the second adapter sleeve 21 three are formed moves to joint pin 16, groove 23 is blocked at axial direction with coordinating of cone tank 18 by tapered portion 17, let out path under the artesian water of top to be blocked, when elastic piston continues to rise, hydraulic pressure in pump barrel 13 raises, expansion sleeve 20 expands and external diameter increases until coordinate with the crush seal of pump barrel 13 inwall, path is let out under the artesian water of further blocking-up top, when elastic piston continues up, the artesian water of top is extracted out, via valve 4 and the pipeline discharge of ground surface platform 5.When elastic piston declines, the entirety that first adapter sleeve 19, expansion sleeve 20 and the second adapter sleeve 21 three are formed moves to the other end of center-pole 22, groove 23 is opened, the artesian water of below can rise to above elastic piston along groove 23, so move in circles intermitten, constantly discharged outside coal bed gas well by artesian water.
There is following defect in the draining aerogenesis apparatus of said structure: (1) is different from oil rig, oil rig adopts the rods of wire rope outpacking rubber Rotating fields and the effect of sealing to be fully prevent oil from revealing via sealing place, oil leakage can work the mischief to surrounding enviroment, cause the waste of resource simultaneously, and draining aerogenesis apparatus extract and discharge be water, also can not pollute surrounding enviroment even if reveal, also the wasting of resources can not be caused, so time adopt the rods of special construction and sealing device and unnecessary, the raising of cost can be caused; (2) because expansion sleeve 20 adopts polyurethane material to make usually, the anti-wear performance of this material own is poor, rub owing to existing with pump barrel 13 inwall and easily damage inefficacy in the long course of work, now must timing be changed by expansion sleeve 20, and for above-mentioned in depth under elastic piston, the replacing of expansion sleeve 20 is very loaded down with trivial details inconvenience.
Utility model content
The utility model provides the automatic intermittent CBM Drainage aquatic products device of air that a kind of structure is simple, running cost is low for solving in known technology the technical problem that exists.
The technical scheme that the utility model is taked for the technical problem existed in solution known technology is: a kind of automatic intermittent CBM Drainage aquatic products device of air comprises the ground surface platform being arranged on coal bed gas well well head, ground surface platform is provided with the valve for draining and exhaust and pipeline, also be provided with sealing device, in the sleeve pipe of coal bed gas well, be provided with water pipe; The lower end of water pipe by variable buckle be connected with pump barrel, by lower variable buckle, valve mesh wire blocking component is installed in the lower end of pump barrel; Also comprise and draw the rods of rolling up and putting by draw-gear, rods penetrates the inner chamber of pump barrel via sealing device, is provided with pumping piston in the bottom of rods; Described rods be wire rope at least partially.
Preferably: pumping piston comprises the multiple piston units be connected in series, be connected with to hang connect termination in the lower end of rods, the piston unit mounting of the top is connected to hang and connects on termination.
Preferably: piston unit comprises top and bottom respectively with the center-pole of upper centralizer and lower centralizer, is provided with upper binding head, is provided with lower union joint in the lower end of lower centralizer in the upper end of upper centralizer; The body of rod of center-pole is arranged with top and bottom respectively with on the sleeve of chuck and lower chuck, entertain multiple armfuls of sheets in the outer wall pressed on ring of sleeve, the two ends up and down of embracing sheet are all shunk and embed upper space between chuck and sleeve and the space between lower chuck and sleeve respectively; Be equipped with fin embracing the outer rim at the upper and lower two ends of sheet, the inwall of upper chuck and lower chuck is equipped with cannelure, and fin embeds in cannelure; Multiple breach is provided with in the top circumference of upper chuck.
Preferably: upper binding head comprises the body of rod affixed with upper centralizer and is molded over the spheroid at body of rod top, lower union joint comprises the cylinder affixed with lower centralizer, offers the ball room supplying the spheroid of upper binding head to fall into and the notch laterally embedded for the body of rod of upper binding head in the bottom of cylinder.
Preferably: described armful of sheet is polytetrafluoroethylene (PTFE) material.
Preferably: be also arranged with the O type circle strutted by each armful of sheet at the middle part of sleeve, be provided with integrated boss, be provided with cannelure at the middle part of boss at the middle part of each armful of sheet Nell wall, O type circle embeds in this cannelure.
Advantage of the present utility model and good effect are:
The utility model provides a kind of automatic intermittent CBM Drainage aquatic products device of air of structure design advantages of simple, the technical program is revealed coal bed gas well artesian water on a small quantity for ground surface platform and can not be destroyed surrounding environment and can not cause the feature of the wasting of resources, by arranging rods at least partially for wire rope material, compared with the rods of outpacking rubber layer, reduce system cost.
Movable device in the middle part of piston unit is designed to be made up of sleeve, upper chuck, lower chuck and multiple armfuls of sheets, compared with adopting expansion sleeve parts with existing draining aerogenesis apparatus, achieve and coordinate by the clearance-type breathing of embracing between sheet the technique effect reaching near-hermetic between pump barrel inwall.
Require hermeticly between piston unit and pump barrel to require different from oil rig, the piston unit of CBM Drainage aquatic products device of air allows that a small amount of artesian water lets out below down again via piston unit, therefore the structure adopting above-mentioned clearance-type to embrace sheet is rational.The pattern of gap breathing is compared with the pattern of swollen envelope, the material making that above-mentioned armful of sheet can possess larger rigidity and select antiwear characteristic stronger, like this in the long operation process of piston unit, embrace the rubbing action that sheet more can sustain pump barrel inwall, application life extends, without the need to carrying out part replacement and maintenance frequently, therefore the cost of operation and maintenance also reduces.
By adopting multi-level piston units in series to connect, can effectively be reduced in the process lifting at every turn and draw water via the pressure-bearing water yield of leaking mistake under piston unit.
By to arrange upper binding head and lower union joint be body of rod top with the form of structure with ball room and notch bottom spheroid and cylinder, improve multi-level piston unit and to connect step by step the convenience of mounting operation, very easily carry out the dismounting of pumping piston.
Accompanying drawing explanation
Fig. 1 is that master of the present utility model looks sectional structure schematic diagram;
Fig. 2 is the main TV structure schematic diagram of piston unit in Fig. 1;
Fig. 3 is the sectional structure schematic diagram in Fig. 2 in the middle part of piston unit;
Fig. 4 is that the master of prior art Elastic piston is depending on partly cuing open structural representation.
In figure: 1, draw-gear; 2, rods; 3, sealing device; 4, valve; 5, ground surface platform; 6, sleeve pipe; 7, water pipe; 8, hang and connect termination; 9, piston unit; 9-1, upper binding head; 9-2, upper centralizer; 9-3, center-pole; 9-4, breach; 9-5, upper chuck; 9-6, armful sheet; 9-7, lower chuck; 9-8, lower centralizer; 9-9, lower union joint; 9-10, O type circle; 9-11, boss; 9-12, sleeve; 10, weight linear meter; 11, valve device for plug of sieve tube assembly; 12, upper variable buckle; 13, pump barrel; 14, lower variable buckle; 15, connector; 16, joint pin; 17, tapered portion; 18, cone tank; 19, the first adapter sleeve; 20, expansion sleeve; 21, the second adapter sleeve; 22, center-pole; 23, groove; 24, threaded portion.
Detailed description of the invention
For summary of the invention of the present utility model, Characteristic can be understood further, hereby exemplify following examples and be described in detail as follows:
Refer to Fig. 1, the utility model comprises the ground surface platform 5 being arranged on coal bed gas well well head and the water pipe 7 being positioned at coal bed gas well sleeve pipe 6, ground surface platform 5 is provided with the valve 4 for draining and exhaust and pipeline, also comprise sealing device 3, wherein drain tap and extract duct are used for aerogenesis, water discharging valve and drainage pipe and are used for draining.
On the lower end of water pipe 7 is passed through, variable buckle 12 is connected with pump barrel 13, by lower variable buckle 14, valve mesh wire blocking component 11 is installed in the lower end of pump barrel 13, wherein valve as the one-way valve element preventing artesian water from refluxing, screen casing for contain in filtering artesian water Large stone impurity, plug for preventing the leakage of pipeline, play the effect of sealing.
Also comprise and draw the rods 2 of rolling up and putting by draw-gear 1, rods 2 penetrates the inner chamber of pump barrel 13 via sealing device 3.Draw-gear 1 can be batch (-type) bailing device, comprises the structures such as frame, reducing motor, reel, brake gear, realizes lift to well inner carrier and below by putting rods 2 toward rewinding.Rods 2 coordinates the sealing realized when rods 2 is slided with sealing device 3, the artesian water extracted in anti-antipriming pipe 7 leaks in a large number at sealing device 3 place, forces artesian water to be discharged via valve 4 and drainage pipe.
Rods 2 has at least a part to be wire rope material, is preferably whole piece rods 2 and is wire rope material.Wire rope material possesses great cost advantage compared with the rods 2 of outpacking rubber layer.Thus, the structure of sealing device 3 also can simplify, coordinated to avoid leaking into allow to there is certain leakage with the rods 2 of outpacking rubber layer by strict guarantee, reduce the complexity of sealing device 3 herein, also just reduce further the cost of system, namely directly reduce the installation cost of draining aerogenesis apparatus and the cost of later stage operation maintenance.
The multiple piston units 9 be connected in series are provided with in pump barrel 13, multiple piston unit 9 forms complete pumping piston, choosing multiple benefit of carrying out being connected in series is can effectively be reduced in the process that lifts at every turn and draw water to leak the pressure-bearing water yield lost 9 times via piston unit, promotes the efficiency of draining aerogenesis.In the present embodiment, can hang connect termination 8 in the affixed setting in the lower end of rods 2, piston unit 9 mounting of the top is connected to hang and connects on termination 8, and this hangs and connects termination 8 can promote pumping piston installation convenience as a kind of quick connector.Weight linear meter 10 can also be set for pumping piston, with promote pumping piston descending along pump barrel 13 time rapidity and stability.
Fig. 2 is the structural representation of piston unit 9, can find out: piston unit 9 comprises top and bottom respectively with the center-pole 9-3 of upper centralizer 9-2 and lower centralizer 9-8, be provided with upper binding head 9-1 in the upper end of upper centralizer 9-2, be provided with lower union joint 9-9 in the lower end of lower centralizer 9-8; The body of rod of center-pole 9-3 is arranged with top and bottom respectively with on the sleeve 9-12 of chuck 9-5 and lower chuck 9-7, entertain multiple armfuls of sheet 9-6 in the outer wall pressed on ring of sleeve 9-12, embrace the two ends up and down of sheet 9-6 and all shrink and embed the space between upper space between chuck 9-5 and sleeve 9-12 and lower chuck 9-7 and sleeve 9-12 respectively; Be equipped with fin in the outer rim of embracing the upper and lower two ends of sheet 9-6, the inwall of upper chuck 9-5 and lower chuck 9-7 is equipped with cannelure, fin embeds in cannelure; Multiple breach 9-4 is provided with in the top circumference of upper chuck 9-5.
Each armful of sheet 9-6 forms the breathing cover of a circumference with multiple gap jointly, embraces sheet 9-6 and adopts as the materials such as polytetrafluoroethylene (PTFE) make, to promote abrasion resistance during CONTACT WITH FRICTION between pump barrel 13 inwall, increase the service life in the present embodiment.
Also be arranged with the O type circle 9-10 strutted by each armful of sheet 9-6 at the middle part of sleeve 9-12, be provided with integrated boss 9-11, be provided with cannelure at the middle part of boss 9-11 at the middle part of each armful of sheet 9-6 Nell wall, O type circle 9-10 embeds in this cannelure.
Be sequentially connected in series for the ease of piston unit 9 at different levels, its upper and lower connector can be set to quick connector form in the present embodiment, particularly: upper binding head 9-1 comprises the body of rod affixed with upper centralizer 9-2 and is molded over the spheroid at body of rod top, lower union joint 9-9 comprises the cylinder affixed with lower centralizer 9-8, offers the ball room supplying the spheroid of upper binding head 9-1 to fall into and the notch laterally embedded for the body of rod of upper binding head 9-1 in the bottom of cylinder.Concrete operations are: the top connection 9-1 of hand-held next piston unit 9, the spheroid of this upper binding head 9-1 and the body of rod notch via the lower union joint 9-9 of a upper piston unit 9 is laterally embedded, make spheroid fall into ball indoor again, the mounting namely completing two-stage piston unit 9 is connected in series.
Distance after each armful of sheet 9-6 struts completely between its outer wall and pump barrel 13 inwall is 0.07mm to 1mm.
The course of work: the reductor of draw-gear 1 controls its spool turns, by rods 2 i.e. wire rope unreeling, under gravity, the pumping piston that piston unit 9 at different levels is formed is descending along pump barrel 13, movable device now in the middle part of piston unit 9 at different levels relatively moves to top, each armful of sheet 9-6 is in relative constriction state, and the artesian water be enclosed in pump barrel 13 by valve is up via the gap between the space of embracing between sheet 9-6 and pump barrel 13 inwall and armful sheet 9-6.Bottom piston unit 9 move to the bottom of pump barrel 13 after, the reductor reversion of draw-gear 1 controls the revolution of its reel, rods 2 i.e. wire rope is wound on reel again, pumping piston is up along pump barrel 13, movable device now in the middle part of piston unit 9 at different levels relatively moves to below, the bottom of lower chuck 9-7 contacts with the upper surface of lower centralizer 9-8, the state of relative distending is under the effect of each armful of sheet 9-6 hydraulic pressure up, and form certain sealing between the inwall of pump barrel 13, when pumping piston continues up, artesian water above it is extracted upwards, through being discharged by valve 4 and drainage pipe after arriving ground surface platform 5.
Can install the pressure sensor of artesian water under coal bed gas well, pressure information be passed to the controller on ground, controller responds draining according to this pressure information according to preset rules timing interval.
Claims (6)
1. an automatic intermittent CBM Drainage aquatic products device of air, comprise the ground surface platform (5) being arranged on coal bed gas well well head, ground surface platform (5) is provided with the valve (4) for draining and exhaust and pipeline, also be provided with sealing device (3), in the sleeve pipe (6) of coal bed gas well, be provided with water pipe (7); It is characterized in that: be connected with pump barrel (13) in the lower end of water pipe (7) by upper variable buckle (12), by lower variable buckle (14), valve mesh wire blocking component (11) is installed in the lower end of pump barrel (13); Also comprise and draw the rods (2) of rolling up and putting by draw-gear (1), rods (2) penetrates the inner chamber of pump barrel (13) via sealing device (3), is provided with pumping piston in the bottom of rods (2); Described rods (2) be wire rope at least partially.
2. automatic intermittent CBM Drainage aquatic products device of air as claimed in claim 1, it is characterized in that: pumping piston comprises the multiple piston units (9) be connected in series, be connected with to hang in the lower end of rods (2) and connect termination (8), piston unit (9) mounting of the top is connected to hang and connects on termination (8).
3. automatic intermittent CBM Drainage aquatic products device of air as claimed in claim 2, it is characterized in that: piston unit (9) comprises top and bottom respectively with the center-pole (9-3) of upper centralizer (9-2) and lower centralizer (9-8), be provided with upper binding head (9-1) in the upper end of upper centralizer (9-2), be provided with lower union joint (9-9) in the lower end of lower centralizer (9-8); The body of rod of center-pole (9-3) is arranged with top and bottom respectively with the sleeve (9-12) of upper chuck (9-5) and lower chuck (9-7), entertain multiple armfuls of sheets (9-6) in the outer wall pressed on ring of sleeve (9-12), the two ends up and down of embracing sheet (9-6) are all shunk and embed upper space between chuck (9-5) and sleeve (9-12) and the space between lower chuck (9-7) and sleeve (9-12) respectively; Be equipped with fin in the outer rim of embracing the upper and lower two ends of sheet (9-6), the inwall of upper chuck (9-5) and lower chuck (9-7) is equipped with cannelure, in fin embedding cannelure; Multiple breach (9-4) is provided with in the top circumference of upper chuck (9-5).
4. automatic intermittent CBM Drainage aquatic products device of air as claimed in claim 3, it is characterized in that: upper binding head (9-2) comprises the body of rod affixed with upper centralizer (9-2) and is molded over the spheroid at body of rod top, lower union joint (9-9) comprises the cylinder affixed with lower centralizer (9-8), offers the ball room supplying the spheroid of upper binding head (9-2) to fall into and the notch laterally embedded for the body of rod of upper binding head (9-2) in the bottom of cylinder.
5. automatic intermittent CBM Drainage aquatic products device of air as claimed in claim 4, is characterized in that: described armful of sheet (9-6) is polytetrafluoroethylene (PTFE) material.
6. automatic intermittent CBM Drainage aquatic products device of air as claimed in claim 4, it is characterized in that: be also arranged with the O type circle (9-10) each armful of sheet (9-6) strutted at the middle part of sleeve (9-12), integrated boss (9-11) is provided with at the middle part of each armful of sheet (9-6) Nell wall, be provided with cannelure at the middle part of boss (9-11), O type circle (9-10) embeds in this cannelure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520364136.0U CN204663500U (en) | 2015-05-26 | 2015-05-26 | A kind of automatic intermittent CBM Drainage aquatic products device of air |
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| CN201520364136.0U CN204663500U (en) | 2015-05-26 | 2015-05-26 | A kind of automatic intermittent CBM Drainage aquatic products device of air |
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| CN204663500U true CN204663500U (en) | 2015-09-23 |
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| CN201520364136.0U Expired - Fee Related CN204663500U (en) | 2015-05-26 | 2015-05-26 | A kind of automatic intermittent CBM Drainage aquatic products device of air |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104863548A (en) * | 2015-05-26 | 2015-08-26 | 王玉 | Automatic intermittent coalbed methane water draining and gas producing device |
| CN111677484A (en) * | 2020-07-22 | 2020-09-18 | 吕学民 | Intelligent ultra-long stroke oil production system |
-
2015
- 2015-05-26 CN CN201520364136.0U patent/CN204663500U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104863548A (en) * | 2015-05-26 | 2015-08-26 | 王玉 | Automatic intermittent coalbed methane water draining and gas producing device |
| CN111677484A (en) * | 2020-07-22 | 2020-09-18 | 吕学民 | Intelligent ultra-long stroke oil production system |
| CN111677484B (en) * | 2020-07-22 | 2023-08-18 | 梅河口市弘业无缝钢管有限公司 | Intelligent ultra-long stroke oil extraction production system |
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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: 20150923 Termination date: 20200526 |
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| CF01 | Termination of patent right due to non-payment of annual fee |