CN105672969A - Fireflood producing well matching device - Google Patents
Fireflood producing well matching device Download PDFInfo
- Publication number
- CN105672969A CN105672969A CN201511006055.4A CN201511006055A CN105672969A CN 105672969 A CN105672969 A CN 105672969A CN 201511006055 A CN201511006055 A CN 201511006055A CN 105672969 A CN105672969 A CN 105672969A
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- check valve
- valve
- producing well
- medicament
- corollary apparatus
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/243—Combustion in situ
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing, limiting or eliminating the deposition of paraffins or like substances
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- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Check Valves (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
Abstract
The present invention discloses a fireflood producing well matching device. The fireflood producing well matching device comprises a liquid storage tank, the top of which is provided with a medicament adding port and a blow hole, and the bottom of which is provided with an opening communicated with a pipeline; and a pump capable of providing the liquid storage tank with medicament through a connecting pipe, wherein the pump comprises a hollow body longitudinally extending in a first direction and a piston slidably disposed in the body, one end of the body is provided with a first one-way valve, one end of the first one-way valve is immersed in the medicament, and a side wall of the body is provided with a second one-way valve communicated with the body. When the piston is far from a first position of the second one-way valve, the first one-way valve is opened; and when the piston is close to the first position of the second one-way valve, the first one-way valve is closed, and the second one-way valve is opened. The fireflood producing well matching device is used for achieving freezing and plugging prevention of a fireflood producing well tail gas system.
Description
Technical field
The present invention relates to a kind of fireflood producing well vent gas treatment field, particularly to a kind of fireflood producing well corollary apparatus.
Background technology
In fireflood exploitation, owing to producing well tail gas humidity is relatively big, exhaust system there will be pipeline frosting undergauge, hydrops frozen block in producing in the winter time, pipeline is obstructed, thus causing system pressure to rise, in turn resulting in whole system and building the pressure. When pressure gradually rises in system, causing that the liquid level in pit shaft declines, oil well pump is likely to gas lock phenomenon, and pump efficiency reduces, and affects well yield.
In existing exhaust system de-plugging voltage reduction method, a kind of good method of effect is injection chemical agent in pipe network, to reduce the overall freezing point that ginseng has the mixed liquor of methanol, makes mixed liquor not easily solidify when low temperature, it is achieved anti-icing fluid. But at present, the process of the chemical agent of exhaust gas flow path is complicated, needs several employee compositions, workload is relatively big, and there is certain risk.
Therefore, it is necessary to propose a kind of special fireflood producing well corollary apparatus, to realize the fireflood anti-frozen block of producing well exhaust system.
Summary of the invention
It is an object of the invention to provide a kind of fireflood producing well corollary apparatus, be used for realizing the fireflood anti-frozen block of producing well exhaust system.
The above-mentioned purpose of the present invention can adopt following technical proposal to realize:
Fireflood producing well corollary apparatus, comprising: fluid reservoir, its top is provided with dosing mouth and spiracle, is provided with the perforate being connected with pipeline bottom it; The pump of medicament can be provided to described fluid reservoir by connecting tube, it includes the hollow body of longitudinal extension along a first direction and is slidably disposed on described intrinsic piston, one end of described body is provided with the first check valve, the described one end submergence arranging the first check valve in a medicament, is provided with the second check valve being connected with described body on the sidewall of described body; When described piston is away from the primary importance of described second check valve, described first one-way valve opens, medicament enters in described body; When described piston is near the primary importance of described second check valve, described first closed check valve, described second one-way valve opens, medicament is flowed in described fluid reservoir by described connecting tube.
In a preferred embodiment, described first check valve includes: the first valve bonnet, the first valve ball, the first valve seat; Described second check valve includes: the second valve bonnet, the second valve ball, the second valve seat; The axis of described first valve bonnet is parallel with described first direction or overlaps, and the axis of described second valve seat is perpendicular with described first direction.
In a preferred embodiment, the other end of described body is provided with gland, and described gland is equipped with pull bar, and described pull bar one end and described piston are fixed, and the other end is provided with handle.
In a preferred embodiment, described the internal locating part that is provided with, described locating part is arranged on described second check valve side away from described first check valve, and the position at described locating part place is described primary importance.
In a preferred embodiment, described locating part is the block with at least one perforate, and it is fixed on described body by fixture.
In a preferred embodiment, described dosing mouth is provided with valve.
In a preferred embodiment, described dosing mouth is provided with snap joint, and described second check valve is provided with pipe joint, and described snap joint, pipe joint are respectively used to and described connecting tube coordinates.
In a preferred embodiment, described fluid reservoir position of opening is provided with volume control device, and it can set the flow of described fluid reservoir position of opening according to the tail gas discharge capacity of oil well.
In a preferred embodiment, the medicament of described fireflood producing well corollary apparatus is methanol.
In a preferred embodiment, it also includes liquidometer, and the lower end of described liquidometer is connected with bottom described fluid reservoir.
The features and advantages of the invention are: the application is provided with piston and the pump of the first check valve, the second check valve, and by connecting tube, pump is connected with fluid reservoir. During use, pull up piston, described piston to the primary importance away from described second check valve move time, described internal generation negative pressure. Now, described first one-way valve opens, medicament enters in the body of described pump. Lower push piston, described piston is to when the primary importance of described second check valve moves, and described first closed check valve, described second one-way valve opens, medicament is by the described connecting tube described fluid reservoir of inflow. By described fluid reservoir to after described pipeline injects medicament, described medicament mixes mutually with tail gas, it is possible to reduces the overall freezing point of mixed liquor in pipeline, makes mixed liquor not easily solidify when low temperature, it is deposited in pipeline thus not being easily formed hydrops, it is to avoid under low temperature, cause the frozen block of pipeline to build the pressure.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of fireflood producing well corollary apparatus in the application embodiment.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, technical scheme is elaborated, it should be understood that these embodiments are merely to illustrate the present invention rather than restriction the scope of the present invention, after having read the present invention, the amendment of the various equivalent form of values of the present invention is each fallen within the application claims limited range by those skilled in the art.
The present invention provides a kind of fireflood producing well corollary apparatus, is used for realizing the fireflood anti-frozen block of producing well exhaust system, during use, and efficient, safety.
Referring to Fig. 1, the application embodiment provides a kind of fireflood producing well corollary apparatus, comprising: fluid reservoir 1, its top is provided with dosing mouth 10 and spiracle 11, is provided with the perforate 12 being connected with pipeline 2 bottom it; The pump 4 of medicament can be provided to described fluid reservoir 1 by connecting tube 3, it includes the hollow body 40 of X longitudinal extension along a first direction and is slidably disposed on the piston 41 in described body 40, one end of described body 40 is provided with the first check valve 5, the described one end submergence arranging the first check valve 5 in a medicament, is provided with the second check valve 6 being connected with described body 40 on the sidewall of described body 40; When described piston 41 is away from the primary importance A of described second check valve 6, described first check valve 5 is opened, and medicament enters in described body 40; Described piston 41 is when the primary importance A of described second check valve 6, and described first check valve 5 is closed, and described second check valve 6 is opened, and medicament is flowed in described fluid reservoir 1 by described connecting tube 3.
In the present embodiment, described fluid reservoir 1 is used for holding medicament. Concrete, it can be the column type of hollow or cuboid or can also for other shape, and the application does not do concrete restriction at this. Described fluid reservoir 1 have back to top and bottom. Along gravity direction, described top is upper relatively, under described bottom is relatively. Described top is provided with dosing mouth 10. Required medicament can be injected in described fluid reservoir 1 by described dosing mouth 10. Described dosing mouth 10 can be provided with valve 16. Valve 16 on described dosing mouth 10 is for closing described dosing mouth 10 easily, in case external object enters liquid storage 1. Additionally, described top is additionally provided with spiracle 11. Described spiracle 11 makes in described fluid reservoir 1 identical with external pressure for guarantee, it is simple to insecticide liquid adds from described dosing mouth 10. Concrete, described spiracle 11 can include at described fluid reservoir 1 top perforate and the bend pipe that arranges along perforate. Described bend pipe one end is connected with described fluid reservoir 1, and the other end is connected with the external world, and opening down, it is prevented that environmental contaminants enters described fluid reservoir 1. The bottom of described fluid reservoir 1 is provided with perforate 12, and the medicament in described fluid reservoir 1 can be flowed in the pipeline 2 treating de-plugging blood pressure lowering by described perforate 12.
In the present embodiment, connecting tube 3 can be passed through between described pump 4 with described fluid reservoir 1 to be connected. Described pump 4 is for providing medicament to described fluid reservoir 1. Described pump 4 mainly includes hollow body 40 and is arranged on the piston 41 in described body 40. One end of described body 40 is provided with the first check valve 5. The described one end submergence arranging the first check valve 5 is in a medicament. The other end of described body 40 is provided with gland 43, and described gland 43 is equipped with pull bar 45, and described pull bar 45 one end is fixed with described piston 41, and the other end is provided with handle 47. Described gland 43 is for sealing the other end of described body 1. Described handle 47, pull bar 45 are fixed with described piston 41 after being connected, by pulling handle 47 that described piston 41 can be driven to slide along described first direction X in described body 40. In the present embodiment, the peripheral outer wall that described piston 41 matches with described body 40 can be provided with sealing member, to realize the sealing of described piston 41 and described body 40.
Described first check valve 5 may include that first valve bonnet the 51, first valve ball the 52, first valve seat 53. Described first valve bonnet 51 can pass through screwed connection in one end of described body 40, and described first valve seat 53 passes through screwed connection in described first valve bonnet 51. Described first valve seat 53 matches with described first valve bonnet 51 and is limited between the two by described first valve ball 52. The function of described first check valve 5 is one-way flow, and when namely described first valve ball 51 abuts against with described first valve seat 53, described first check valve 5 is not turned on; When described first valve ball 51 is separated with described first valve seat 53, described first check valve 5 turns on. Described first valve bonnet 51 can limit described first valve ball 52 displacement away from described first valve seat 53.
The sidewall of described body 40 is provided with the second check valve 6 being connected with described body 40. Described second check valve 6 may include that second valve bonnet the 61, second valve ball the 62, second valve seat 63. Described second valve bonnet 61 can pass through screwed connection on the sidewall of described body 40, and described second valve seat 63 passes through screwed connection in described second valve bonnet 61. Described second valve seat 63 matches with described second valve bonnet 61 and is limited between the two by described second valve ball 62. The function of described second check valve 6 is one-way flow, and when namely described second valve ball 62 abuts against with described second valve seat 63, described second check valve 6 is not turned on; When described second valve ball 62 is separated with described second valve seat 63, described second check valve 6 turns on. Described second valve bonnet 61 can limit described second valve ball 62 displacement away from described second valve seat 63.
When needs inject medicament to pipeline 2, it is possible to by pulling up piston 41, described piston 41 to the primary importance A away from described second check valve 6 move time, produce negative pressure in described body 40, namely body 40 external pressure is more than internal pressure. Now, described first check valve 5 is opened, and medicament enters in described body 40. Lower push piston 41, described piston 41 is to when the primary importance A of described second check valve 6 moves, and described first check valve 5 is closed, and described second check valve 6 is opened, and medicament is flowed in described fluid reservoir 1 by described connecting tube 3. Injected in described pipeline 2 with certain flow by the perforate 12 of described fluid reservoir 1. After unidirectional described pipeline 2 injects medicament, described medicament mixes mutually with tail gas, it is possible to reduces the overall freezing point of mixed liquor in pipeline 2, makes mixed liquor not easily solidify when low temperature, it is deposited in pipeline 2 thus not being easily formed hydrops, it is to avoid under low temperature, cause the frozen block of pipeline 2 to build the pressure.
In one embodiment, the axis 5X of described first check valve 5 first valve bonnet 51 is parallel with described first direction X or overlaps, and the axis 6Y and described first direction X of described second check valve 6 second valve seat 63 are perpendicular.
In the present embodiment, the first valve bonnet 51 of described first check valve 5 can pass through screwed connection in one end of described body 40. Described body 40 can be hollow circuit cylinder, extends along described first direction X. Described first valve bonnet 51 can be overall cylindrical, has axis 5X. Described axis 5X is parallel with described first direction X or overlaps, it is simple to when moving on described piston 41 X along a first direction so that described first valve ball 52 moves along described first direction X.
Second valve seat 63 of described second check valve passes through screwed connection on the sidewall of described body 40. Described second valve seat can be overall cylindrical, has axis 6Y. Described axis 6Y can be perpendicular with described first direction X. Certainly, described axis 6Y can also be at an angle with described first direction X, only need to ensure when X moves down described piston 41 along a first direction, and described second valve ball 62 is separated with described second valve seat 63.
In one embodiment, being provided with locating part 7 in described body 40, described locating part 7 is arranged on described second check valve 6 side away from described first check valve 5, and the position at described locating part 7 place is described primary importance A.
In the present embodiment, on described first direction X, described second check valve 6 is between described locating part 7 and described first check valve 5. Described locating part 7 is for limiting the position of described piston 41 down stroke, when namely described piston 41 moves to the direction near described second check valve 6, when contacting with described locating part 7, stops mobile. For operator, when its gripping handle 47 elapses downwards, when piston 41 runs into described locating part 7, can stop to force, then pull up described handle 47. Additionally, certainly, in another embodiment, the particular location of described piston 41 can also be judged by recording the displacement of described pull bar 45, but with respect to the above-mentioned mode arranging locating part 7, reliability is relatively low, the operation level requirement of operator is higher.
In a specific embodiment, described locating part 7 is the block with at least one perforate, and it is fixed on described body 40 by fixture. In the body 40 of described pump 4, cross section is circular, and the shape of described block can be circular slab. Described locating part 7 can pass through fixture and fix with described body 40. Concrete, described fixture can be fixing screw. Certainly, described locating part 7 can also be other forms, for instance it is at least one projection formed on described body 40 inwall, and described projection can contact with described piston 41, to limit the displacement of its down stroke. Certainly, described locating part 7 is not limited to foregoing description. One of ordinary skill in the art are under the technical spirit of the application is enlightened, it is also possible to make other change, but as long as the function of its realization and effect and the application are same or similar, all should be covered by the application protection domain.
In one embodiment, described dosing mouth 10 is provided with snap joint 14, and described second check valve 6 is provided with pipe joint 31, and described snap joint 14, pipe joint 31 are respectively used to and described connecting tube 3 coordinates.
In the present embodiment, described dosing mouth 10 place is provided with snap joint 14 for connecting with realizing fast and reliable with described connecting tube 3. Described second check valve 6 is provided with pipe joint 31, and what described pipe joint 31 was concrete can be arranged on described second valve bonnet 61. Concrete, its one end can be provided with screw thread and be connected with one end of described connecting tube 3, the other end its can be fixed by the outer wall of screw thread Yu described second valve bonnet 61. After described connecting tube 3 two ends are connected with described snap joint 14 and pipe joint 31 respectively, namely establish the path that described pump 4 connects with fluid reservoir 1.
In one embodiment, described fluid reservoir 1 perforate 12 position can be provided with volume control device 15, and it can set the flow of described fluid reservoir 1 perforate 12 position according to the tail gas discharge capacity of oil well.
In the present embodiment, the flow of described perforate 12 position sets according to the tail gas discharge capacity of different oil wells. The flow of described perforate 12 position is generally about 1st/50th of tail gas discharge capacity. If explosion danger easily occurs in concentration height, concentration is low, does not utilize antifreeze.
In one embodiment, the medicament of described fireflood producing well corollary apparatus can be methanol. The fusing point of methanol is 97 DEG C, flammable, volatile, it is possible to miscible with water, ethanol, ether, benzene, acetone and most of organic solvent. When methanol mixed is in the liquid of other fusing points high (i.e. freezing point height and easily solidification), it is possible to reduce the overall freezing point that ginseng has the mixed liquor of methanol, make mixed liquor not easily solidify when low temperature. Additionally, methanol also has cheap as antifreezing agent, lower-cost advantage. Certainly, described medicament is not limited to foregoing description. One of ordinary skill in the art are under the technical spirit of the application is enlightened, it is also possible to make other change, but as long as the function of its realization and effect and the application are same or similar, all should be covered by the application protection domain.
In one embodiment, described fireflood producing well corollary apparatus can also include liquidometer 8. The lower end of described liquidometer 8 is connected with bottom described fluid reservoir 1. Described liquidometer 8 is used for measuring liquid level in described fluid reservoir 1. Concrete, its material can be transparent material, to facilitate ground staff to observe liquid level in fluid reservoir 1.
Described fireflood producing well corollary apparatus is in use, it is possible to by pulling up piston 41, described piston 41 to the primary importance A away from described second check valve 6 move time, produce negative pressure in described body 40, namely body 40 external pressure is more than internal pressure. Now, described first check valve 5 is opened, and medicament enters in described body 40. Lower push piston 41, described piston 41 is to when the primary importance A of described second check valve 6 moves, and described first check valve 5 is closed, and described second check valve 6 is opened, and medicament is flowed in described fluid reservoir 1 by described connecting tube 3. At this point it is possible to again pull up piston 41, owing to body 40 internal pressure reduces, and in described pipeline 2 under fluid pressure effect, second valve ball 62 of described second check valve 6 is pressed in described second valve seat 63, it is prevented that the liquid in pipeline 2 flows backwards in the body 40 of described pump 4, reduces pump efficiency. When the liquid level of described liquidometer 8 reaches predetermined addition requirement, it is possible to pull down snap joint 14, close valve 16. Due to the accompanying gas having crude oil to produce in pipeline 2, so pipeline 2 has certain pressure, can so that medicament slowly enters in pipeline 2. After injecting medicament in described pipeline 2, described medicament mixes mutually with tail gas, it is possible to reduces the overall freezing point of mixed liquor in pipeline 2, makes mixed liquor not easily solidify when low temperature, it is deposited in pipeline 2 thus not being easily formed hydrops, it is to avoid cause the frozen block of pipeline 2 under low temperature, build the pressure.
Herein described fireflood producing well corollary apparatus in use, only needs operator to be operated, can complete to be added by medicament in pipeline 2, it is ensured that whole fireflood producing well exhaust system preventing freeze in winter blocks up, and does not build the pressure, and then ensure that the effect that fireflood is developed.
In addition; for existing dosing method; owing to original pipeline having certain pressure; during in order to prevent dosing; toxic gas with pressure in pipeline flows out and operator is damaged, and contaminated environment, it is necessary to after being bled off by the pressure in pipeline; carry out adding medicine again, to ensure safety and the protection environment of operation. And volume control device 15 can connect fluid reservoir 1 and pipeline 2 in the application. Before filling medicament in fluid reservoir 1, described volume control device 15 is closed; After filling medicament, described volume control device 15 is opened, medicament enters in pipeline 20, eliminates potential safety hazard, it is to avoid bleed off pressure operation, and therefore processing safety is higher, and does not pollute the environment.
Each embodiment above-mentioned in this specification all adopts the mode gone forward one by one to describe, and between each embodiment, identical similar portion is cross-referenced, and what each embodiment stressed is and other embodiment differences.
The foregoing is only several embodiments of the present invention, although as above, but described content is only to facilitate the embodiment understanding the present invention and adopt, is not intended to limit the present invention for the embodiment that disclosed herein. Any those skilled in the art; under the premise without departing from the spirit and scope that disclosed herein; any amendment and change can be done on the formal of embodiment and details; but the scope of patent protection of the present invention, still must be as the criterion with the scope that appended claims defines.
Claims (10)
1. a fireflood producing well corollary apparatus, it is characterised in that comprising:
Fluid reservoir, its top is provided with dosing mouth and spiracle, is provided with the perforate being connected with pipeline bottom it;
The pump of medicament can be provided to described fluid reservoir by connecting tube, it includes the hollow body of longitudinal extension along a first direction and is slidably disposed on described intrinsic piston, one end of described body is provided with the first check valve, the described one end submergence arranging the first check valve in a medicament, is provided with the second check valve being connected with described body on the sidewall of described body;
When described piston is away from the primary importance of described second check valve, described first one-way valve opens, medicament enters in described body;
When described piston is near the primary importance of described second check valve, described first closed check valve, described second one-way valve opens, medicament is flowed in described fluid reservoir by described connecting tube.
2. fireflood producing well corollary apparatus as claimed in claim 1, it is characterised in that described first check valve includes: the first valve bonnet, the first valve ball, the first valve seat; Described second check valve includes: the second valve bonnet, the second valve ball, the second valve seat; The axis of described first valve bonnet is parallel with described first direction or overlaps, and the axis of described second valve seat is perpendicular with described first direction.
3. fireflood producing well corollary apparatus as claimed in claim 1, it is characterised in that: the other end of described body is provided with gland, and described gland is equipped with pull bar, and described pull bar one end and described piston are fixed, and the other end is provided with handle.
4. fireflood producing well corollary apparatus as claimed in claim 1, it is characterized in that: described internal is provided with locating part, described locating part is arranged on described second check valve side away from described first check valve, and the position at described locating part place is described primary importance.
5. fireflood producing well corollary apparatus as claimed in claim 4, it is characterised in that: described locating part is the block with at least one perforate, and it is fixed on described body by fixture.
6. fireflood producing well corollary apparatus as claimed in claim 1, it is characterised in that: described dosing mouth is provided with valve.
7. fireflood producing well corollary apparatus as claimed in claim 1, it is characterised in that: described dosing mouth is provided with snap joint, and described second check valve is provided with pipe joint, and described snap joint, pipe joint are respectively used to and described connecting tube coordinates.
8. fireflood producing well corollary apparatus as claimed in claim 1, it is characterised in that: described fluid reservoir position of opening is provided with volume control device, and it can set the flow of described fluid reservoir position of opening according to the tail gas discharge capacity of oil well.
9. fireflood producing well corollary apparatus as claimed in claim 1, it is characterised in that: the medicament of described fireflood producing well corollary apparatus is methanol.
10. fireflood producing well corollary apparatus as claimed in claim 1, it is characterised in that: it also includes liquidometer, and the lower end of described liquidometer is connected with bottom described fluid reservoir.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511006055.4A CN105672969B (en) | 2015-12-29 | 2015-12-29 | Fireflood producing well corollary apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511006055.4A CN105672969B (en) | 2015-12-29 | 2015-12-29 | Fireflood producing well corollary apparatus |
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| Publication Number | Publication Date |
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| CN105672969A true CN105672969A (en) | 2016-06-15 |
| CN105672969B CN105672969B (en) | 2018-01-05 |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2101468C1 (en) * | 1996-02-29 | 1998-01-10 | Закрытое акционерное общество "Сибнефтехнология" | Device for removing hydrateparaffine deposits |
| CN203230388U (en) * | 2013-03-13 | 2013-10-09 | 中国石油天然气股份有限公司 | Downhole liquid release device for oil and gas fields |
| CN104047574B (en) * | 2013-03-13 | 2016-12-28 | 中国石油天然气股份有限公司 | A kind of oil gas field down-hole liquid discharges device and method |
| CN204344446U (en) * | 2014-11-18 | 2015-05-20 | 中国石油天然气股份有限公司 | Anticorrosion lubricating fitting |
| CN204592699U (en) * | 2015-03-26 | 2015-08-26 | 联合石油天然气投资有限公司 | Pipeline effusion drainage device |
| CN104775790A (en) * | 2015-04-02 | 2015-07-15 | 张果 | Sleeve gas exhausting device |
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