CN111663917B - Underground dynamic sealing device of ultra-long stroke pumping unit - Google Patents
Underground dynamic sealing device of ultra-long stroke pumping unit Download PDFInfo
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- CN111663917B CN111663917B CN202010708467.7A CN202010708467A CN111663917B CN 111663917 B CN111663917 B CN 111663917B CN 202010708467 A CN202010708467 A CN 202010708467A CN 111663917 B CN111663917 B CN 111663917B
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- oil pipe
- wire rope
- oil
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- 238000005086 pumping Methods 0.000 title claims abstract description 65
- 238000007789 sealing Methods 0.000 title claims abstract description 38
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 55
- 239000010959 steel Substances 0.000 claims abstract description 55
- 238000001802 infusion Methods 0.000 claims abstract description 7
- 238000004804 winding Methods 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims description 23
- 239000003129 oil well Substances 0.000 claims description 12
- 238000005507 spraying Methods 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 4
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 4
- 241001330002 Bambuseae Species 0.000 claims description 4
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 4
- 239000011425 bamboo Substances 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 2
- 230000001174 ascending effect Effects 0.000 claims 1
- 239000003638 chemical reducing agent Substances 0.000 abstract description 7
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 14
- 238000000605 extraction Methods 0.000 description 13
- 238000003825 pressing Methods 0.000 description 8
- 238000009434 installation Methods 0.000 description 4
- 230000002265 prevention Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
Classifications
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/1208—Packers; Plugs characterised by the construction of the sealing or packing means
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/04—Casing heads; Suspending casings or tubings in well heads
-
- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
- E21B43/126—Adaptations of down-hole pump systems powered by drives outside the borehole, e.g. by a rotary or oscillating drive
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses an underground dynamic sealing device of an ultra-long stroke pumping unit, which comprises an inner working cylinder, an outer working cylinder and an oil pipe four-way joint, wherein the outer working cylinder is sleeved on the inner working cylinder, an annular channel is formed between the inner wall of the outer working cylinder and the outer wall of the inner working cylinder, the oil pipe four-way joint is sleeved on the tops of the inner working cylinder and the outer working cylinder, the annular channel between the inner working cylinder and the outer working cylinder is communicated with an infusion channel on the side surface of the oil pipe four-way joint, a first plunger is arranged in the inner cavity of the inner working cylinder, the top of the first plunger is connected with a steel wire rope, and the steel wire rope is connected with a winding device on the ground after passing through the inner working cylinder in the central channel of the oil pipe four-way joint. The beneficial effects are that: the output torque of the speed reducer is reduced by 27%. The safety coefficient can reach 4.26. The cost per meter is only 2/3 of the cost of the steel wire rope in the existing equipment as the sucker rod. The underground dynamic sealing device of the ultra-long stroke pumping unit provided by the invention is applied to the development of deep wells and medium deep wells of the ultra-long stroke pumping unit with more than 12 degrees.
Description
Technical Field
The invention relates to an underground dynamic sealing device, in particular to an underground dynamic sealing device of an ultra-long stroke pumping unit.
Background
At present, in the development and production of oil fields, the mechanical oil extraction of a sucker rod pump accounts for more than 98% of the total number of wells in the oil fields, and all the mechanical oil extraction modes of the sucker rod pump for connecting the ground mechanical oil extraction equipment and the underground sucker rod are through an oil pumping polished rod or a flexible oil pumping polished rod, and at present, the sealing of a wellhead is ensured through an oil extraction wellhead polished rod sealer. In particular, the flexible sucker rod of the steel wire rope is mature day by day, which lays a foundation for the ultra-long stroke (more than or equal to 15 m) oil extraction technology, the flexible steel wire rope sucker rod of the same structure type is used in the ultra-long stroke oil pumping machine which is widely used in the oilfield mining fields at present and has patent numbers of CN201230127009.0 and 201420750926.8, the sucker rod adopts a single steel wire and a single steel wire, the inner gap of the steel wire rope is completely filled with the composite material during weaving, and the special technology is adopted to wholly cover the steel wire rope sucker rod of the wear-resistant composite material on the outer layer of the steel wire rope main body, so that the maximum outer diameter is 30mm. The steel wire rope is characterized in that the steel wire rope is compact in inner structure and smooth in outer part, and can be sealed by a wellhead. The breaking force of the 30mm steel wire rope sucker rod is low by only 200KN (the steel wire rope of the petroleum compacted strand with the same diameter reaches 776 KN), so that the problems are brought, firstly, the model of the super-stroke pumping unit can only reach 8 pumping units, and the development of the super-long-stroke oil extraction technology is seriously restricted; the safety use coefficient is low, the safety coefficient of the 8-type pumping unit is only 2.5, and the safety use coefficient is far lower than the requirement of 4-5 times of the safety use coefficient of the steel wire rope; thirdly, the price of each meter of the 30mm steel wire rope sucker rod is 72 yuan, the service length of a single well of the product in the two patents reaches 100 meters, and the field application result proves that the service life of the steel wire rope sucker rod for sealing a wellhead is only one year, the service life of a sealing packing is 2 months, and the oil extraction production cost and the labor intensity of field operators are greatly increased.
Disclosure of Invention
The invention aims to solve the problems that a steel wire rope is used as an oil pumping polished rod, and the oil pumping polished rod has low breaking force, high safety risk and short wellhead sealing service life in the using process, so that the large-scale popularization and application of an ultra-long stroke oil extraction technology are restricted.
The invention provides an underground dynamic sealing device of an ultra-long stroke pumping unit, which comprises an inner working cylinder, an outer working cylinder and an oil pipe four-way joint, wherein the outer working cylinder is sleeved on the inner working cylinder, an annular channel is formed between the inner wall of the outer working cylinder and the outer wall of the inner working cylinder, the oil pipe four-way joint is sleeved on the tops of the inner working cylinder and the outer working cylinder, the annular channel between the inner working cylinder and the outer working cylinder is communicated with an infusion channel on the side surface of the oil pipe four-way joint, a first plunger is arranged in the inner cavity of the inner working cylinder, the top of the first plunger is connected with a steel wire rope, and the steel wire rope penetrates through the inner working cylinder in the central channel of the oil pipe four-way joint and then is connected with a winding device on the ground.
The upper part of the outer working cylinder is provided with a sleeve four-way joint at the lower part of the oil pipe four-way joint, and an upper flange at the top end of the sleeve four-way joint is fixedly connected with a lower flange at the bottom of the oil pipe four-way joint.
The oil pipe four-way valve is characterized in that an oil pipe hanger is arranged in the oil pipe four-way valve, a liquid outlet is formed in the side face of the oil pipe hanger, the liquid outlet in the side face of the oil pipe hanger is communicated with an infusion channel on the side edge of the oil pipe four-way valve, the upper end and the lower end of the oil pipe hanger are sealed, the upper end of an inner working cylinder is connected with a hanging connector, a lower flange on the hanging connector is fixedly connected with an upper flange of the oil pipe four-way valve, a hanger is arranged in the hanging connector, the hanger and the oil pipe hanger are concentrically and hermetically hung, an anti-spraying gate is connected to the upper flange on the top end of the hanging connector, an anti-static box is assembled on the upper portion of the anti-spraying gate, and a steel wire rope passing through the oil pipe hanger, the anti-spraying gate and the anti-static box in sequence is connected with a winding device on the ground.
The bottom of outer working cylinder is provided with the location water conservancy diversion ware, the location water conservancy diversion ware comprises outer tube and inner tube, the outer tube cover is established on the inner tube, the external diameter of outer tube corresponds with the external diameter of outer working cylinder, the external diameter of inner tube corresponds with the external diameter of inner working cylinder, the passageway that forms between the outer wall of the inner wall of outer tube and inner tube is linked together with the annular channel between outer working cylinder and the inner working cylinder, the inner working cylinder is linked together with the central passageway of location water conservancy diversion ware, the lower part of location water conservancy diversion ware has connected gradually oil pipe and oil pump section of thick bamboo, the bottom of oil pump section of thick bamboo is equipped with fixed valve.
The connector is arranged between the lower end of the steel wire rope and the top of a first plunger in the inner cavity of the inner working cylinder and comprises an upper cone body and a lower cone body, wedge-shaped dies are arranged in the upper cone body and the lower cone body, the upper cone body and the lower cone body are connected through a connector, a locking pressing cap is arranged at the top of the upper cone body, a pressing connector is arranged at the bottom of the lower cone body, the locking pressing cap and the pressing connector tightly clamp the steel wire rope on the wedge-shaped dies in the upper cone body and the lower cone body, the pressing connector is fixedly connected with the first plunger, the lower part of the first plunger is connected with a second plunger, the lower part of the second plunger is connected with a third plunger through an oil pumping rod, the third plunger is assembled in the inner cavity of the oil pumping cylinder, and a movable valve is arranged on the third plunger.
The invention is based on the installation and working principle:
the installation principle is as follows:
the first step: firstly, the sleeve four-way is connected to the upper part of the sleeve head on the ground of the oil well through screw threads, and then the lower flange of the oil pipe four-way is connected with the upper flange of the sleeve four-way through bolts.
And a second step of: the production string is put into the well, and the sequence is as follows:
firstly, the oil pump cylinder is put in, and the oil pipe, the positioning deflector, the outer working cylinder and the oil pipe hanger are connected in sequence and hung on the four-way joint of the oil pipe.
Thirdly, producing a rod column by oil extraction in an oil well, wherein the sequence of the rod column in the oil well is as follows: first, a third plunger is put down, and a pump pull rod and a sucker rod are connected in sequence until the well head is reached.
Fourth step: and a hanging joint of the inner working cylinder is connected with an upper flange of the oil pipe four-way joint.
Fifth step: downhole dynamic sealing:
the inner working cylinder is inserted into the central channel of the positioning deflector at the bottom of the inner working cylinder to realize positioning, and finally the top end of the inner working cylinder is connected with the hanger in the hanging joint.
Sixth step: connecting wire rope and underground sealing plunger
According to the stroke length of the underground oil pump barrel, a part of the oil pumping rod larger than the stroke length is lifted, a steel wire rope sequentially passes through the antistatic box and the blowout prevention gate and then sequentially connected with the first plunger, the second plunger and the oil pumping rod through the inner cavity of the inner working barrel, and is lowered to a proper depth after connection is completed, so that the double-pipe concentric hanging sealing production string and the double-pipe concentric underground sealing production string are completely installed.
The working principle of the invention is as follows:
the invention provides an ultra-long stroke pumping unit underground dynamic sealing device which is connected with a first plunger, a second plunger, a pumping rod and a third plunger through a steel wire rope, wherein the ultra-long stroke pumping unit draws the first plunger and the second plunger to synchronously reciprocate up and down in an inner cavity of an inner working cylinder through the steel wire rope, the third plunger also synchronously reciprocates up and down in a pumping cylinder and a ground pumping unit, a movable valve in the third plunger is closed during the upward stroke of the pumping unit, a fixed valve at the bottom of the pumping cylinder is opened, the third plunger, the second plunger and the first plunger are lifted together under the traction of the steel wire rope, liquid in an oil pipe is lifted to a positioning deflector through the third plunger which is lifted up, a part of liquid enters an annular channel between the outer working cylinder and the inner working cylinder through the positioning deflector, then finally flows into a ground gathering pipeline through an oil pipe hanger and an oil pipe, the part of liquid in the positioning deflector reaches the other part of the positioning deflector, and follows the first plunger and the second plunger to travel into the inner working cylinder, and the part of liquid is sealed in the inner working cylinder under the sealing effect of the first plunger and the second plunger.
The third plunger, the first plunger and the second plunger are downwards moved together under the traction of the steel wire rope, the liquid in the oil pump cylinder enters the oil pipe through the movable valve in the third plunger, and part of the liquid entering the inner cavity of the inner working cylinder during the upstroke is discharged under the sealing action of the downwards moving first plunger and the second plunger, enters the annular channel between the outer working cylinder and the inner working cylinder through the positioning deflector, and finally flows into the ground gathering pipeline of the oil well through the oil conveying channel on the side wall of the oil pipe hanger and the four-way oil pipe.
The oil extraction production of the upper and lower stroke cycles is completed by the pumping unit.
The invention has the beneficial effects that:
the underground dynamic sealing device of the ultra-long stroke pumping unit greatly reduces the manufacturing cost of the ultra-long stroke pumping unit, one of the core components of the mechanical part of the ultra-long stroke pumping unit is a speed reducer, the output torque of the speed reducer is directly related to the production manufacturing cost of the speed reducer and other components, the 8-type pumping unit is taken as an example, the rated load of the 8-type pumping unit is 80KN, the maximum lifting load is 120KN, a steel wire rope with the breaking force of 30mm is used as a pumping polished rod, the diameter of a roller is at least 960mm, the rated output torque of the speed reducer is 57600 N.m, a steel wire rope with the breaking force of 20mm is used as a pumping polished rod, the diameter of the roller is reduced to 700mm, the rated output torque of the speed reducer is 42000 N.m, and the output torque of the speed reducer is reduced by 27%.
The underground dynamic sealing device for the ultra-long stroke pumping unit provided by the invention uses the steel wire rope as the pumping polished rod, so that the safety coefficient is obviously improved, the safety coefficient of the steel wire rope as the pumping polished rod calculated according to rated load can reach 4.26, which is far greater than the standard that the safety coefficient of the steel wire rope in the related equipment used at present can only reach 2.5.
The invention provides a dynamic sealing device for an ultra-long stroke pumping unit underground, which prolongs the service life of a pumping rod, reduces the production and operation cost of oil extraction of an oil well, and the sealing mode of the existing steel wire rope pumping rod as the pumping rod is to seal by means of organic materials covered by the surface of the steel wire rope pumping rod. The steel wire rope provided by the invention is used as an oil pumping polished rod, the sealing of a wellhead is not related to the steel wire rope, and the service life of the steel wire rope provided by the invention is at least 3 years under the same service condition and pumping parameters of the oil pumping unit, and the cost per meter is only 2/3 of that of the steel wire rope in the existing equipment.
The underground dynamic sealing device of the ultra-long stroke pumping unit provided by the invention is applied to the development of deep wells and medium deep wells of the ultra-long stroke pumping unit with more than 12 degrees.
Drawings
Fig. 1 is a schematic diagram of the overall structure of the dynamic sealing device according to the present invention.
Fig. 2 is an enlarged structural cross-sectional view of the upper portion of the dynamic sealing device according to the present invention.
Fig. 3 is an enlarged schematic view of a positioning deflector according to the present invention.
Fig. 4 is an enlarged schematic view of a connector according to the present invention.
The labels in the above figures are as follows:
1. an inner working cylinder 2, an outer working cylinder 3, an oil pipe four-way 4, an annular channel 5 and an infusion channel
6. First plunger 7, wire rope 8, sleeve four-way 9, tubing hanger 10 and hanging joint
11. Hanger 12, blowout prevention gate 13, antistatic box 14, positioning deflector 15, and outer tube
16. Inner tube 17, channel 18, oil tube 19, oil pump cylinder 20, fixed valve
21. Connector 22, upper cone 23, lower cone 24, connector 25, locking press cap
26. Compression joint 27, second plunger 28, sucker rod 29, third plunger 30, traveling valve.
Detailed Description
Please refer to fig. 1 to 4:
the invention provides an ultra-long stroke pumping unit underground dynamic sealing device which comprises an inner working cylinder 1, an outer working cylinder 2 and an oil pipe four-way joint 3, wherein the outer working cylinder 2 is sleeved on the inner working cylinder 1, an annular channel 4 is formed between the inner wall of the outer working cylinder 2 and the outer wall of the inner working cylinder 1, the oil pipe four-way joint 3 is sleeved on the tops of the inner working cylinder 1 and the outer working cylinder 2, the annular channel 4 between the inner working cylinder 1 and the outer working cylinder 2 is communicated with an infusion channel 5 on the side edge of the oil pipe four-way joint 3, a first plunger 6 is arranged in an inner cavity of the inner working cylinder 1, the top of the first plunger 6 is connected with a steel wire rope 7, and the steel wire rope 7 penetrates through the inner working cylinder 1 in a central channel of the oil pipe four-way joint 3 and then is connected with a winding device on the ground.
The upper part of the outer working cylinder 2 is provided with a sleeve four-way joint 8 at the lower part of the oil pipe four-way joint 3, and an upper flange at the top end of the sleeve four-way joint 8 is fixedly connected with a lower flange at the bottom of the oil pipe four-way joint 3.
The oil pipe four-way valve is characterized in that an oil pipe hanger 9 is arranged in the oil pipe four-way valve 3, a liquid outlet is formed in the side face of the oil pipe hanger 9, the liquid outlet in the side face of the oil pipe hanger 9 is communicated with an infusion channel 5 in the side face of the oil pipe four-way valve 3, the upper end and the lower end of the oil pipe hanger 9 are sealed, the upper end of the inner working cylinder 1 is connected with a hanging connector 10, a lower flange on the hanging connector 10 is fixedly connected with an upper flange of the oil pipe four-way valve 3, a hanger 11 is arranged in the hanging connector 10, the hanger 11 and the oil pipe hanger 9 are concentrically and hermetically hung, an anti-spraying gate 12 is connected to an upper flange at the top end of the hanging connector 10, an anti-static box 13 is assembled on the upper portion of the anti-spraying gate 12, and a steel wire rope 7 passing through the oil pipe hanger 9, the hanger 11, the anti-spraying gate 12 and the anti-static box 13 in sequence is connected with a winding device on the ground.
The bottom of the outer working cylinder 2 is provided with a positioning flow director 14, the positioning flow director 14 consists of an outer tube 15 and an inner tube 16, the outer tube 15 is sleeved on the inner tube 16, the outer diameter of the outer tube 15 corresponds to the outer diameter of the outer working cylinder 2, the inner diameter of the inner tube 16 corresponds to the outer diameter of the inner working cylinder 1, a channel 17 formed between the inner wall of the outer tube 15 and the outer wall of the inner tube 16 is communicated with an annular channel 4 between the outer working cylinder 2 and the inner working cylinder 1, the inner working cylinder 1 is communicated with a central channel of the positioning flow director 14, the lower part of the positioning flow director 14 is sequentially connected with an oil tube 18 and an oil pump cylinder 19, and the bottom of the oil pump cylinder 19 is provided with a fixed valve 20.
A connector 21 is arranged between the lower end of the steel wire rope 7 and the top of the first plunger 6 in the inner cavity of the inner working cylinder 1, the connector 21 comprises an upper cone 22 and a lower cone 23, wedge-shaped dies are arranged in the upper cone 22 and the lower cone 23, the upper cone 22 and the lower cone 23 are connected through a connector 24, a locking cap 25 is arranged at the top of the upper cone 22, a pressing connector 26 is arranged at the bottom of the lower cone 23, the steel wire rope 7 is clamped on the wedge-shaped dies in the upper cone 22 and the lower cone 23 through the locking cap 25 and the pressing connector 26, the pressing connector 26 is fixedly connected with the first plunger 6, a second plunger 27 is connected to the lower part of the first plunger 6, a third plunger 29 is connected to the lower part of the second plunger 27 through a sucker rod 28, the third plunger 29 is assembled in the inner cavity of the sucker rod 19, and a valve 30 is arranged on the third plunger 29.
The invention is based on the installation and working principle:
the installation principle is as follows:
the first step: firstly, the sleeve four-way joint 8 is connected to the upper part of an oil well ground surface sleeve head through screw threads, and then the lower flange of the oil pipe four-way joint 3 is connected with the upper flange of the sleeve four-way joint 8 through bolts.
And a second step of: the production string is put into the well, and the sequence is as follows:
firstly, the oil pump barrel 19 is put in, and the oil pipe 18, the positioning deflector 14, the outer working barrel 2 and the oil pipe hanger 9 are connected in sequence and hung on the oil pipe four-way joint 3.
Thirdly, producing a rod column by oil extraction in an oil well, wherein the sequence of the rod column in the oil well is as follows: first, the third plunger 29 is lowered, and the pump rod, sucker rod 28, are sequentially connected to the wellhead.
Fourth step: the hanging joint 10 of the inner working cylinder 1 is connected with the upper flange of the oil pipe four-way joint 3.
Fifth step: downhole dynamic sealing:
the inner working cylinder 1 is inserted into the outer working cylinder 2 corresponding to the depth of the outer working cylinder 2 penetrating into the well, the lower end of the inner working cylinder 1 is inserted into the central channel of the positioning flow director 14 to realize positioning, and finally the top end of the inner working cylinder 1 is connected with the hanger 11 in the hanging joint 10.
Sixth step: connect the wireline 7 and downhole seal plunger:
according to the stroke length of the underground oil pump barrel 19, the oil pumping rod 28 is lifted out to be larger than the stroke length, the steel wire rope 7 sequentially passes through the antistatic box 13 and the blowout prevention gate 12 and then sequentially connects with the first plunger 6, the second plunger 27 and the oil pumping rod 28 through the inner cavity of the inner working barrel 1, and is lowered to a proper depth after connection is completed, so that the double-pipe concentric hanging sealing production string and the double-pipe concentric underground sealing production string are completely installed.
The working principle of the invention is as follows:
the invention provides an ultra-long stroke pumping unit underground dynamic sealing device, which is connected with a first plunger 6, a second plunger 27, a pumping rod 28 and a third plunger 29 through a steel wire rope 7, wherein the ultra-long stroke pumping unit draws the first plunger 6 and the second plunger 27 to synchronously reciprocate up and down in an inner cavity of an inner working cylinder 1 through the steel wire rope 7, the third plunger 29 also synchronously reciprocates up and down in a pumping unit 19 and a ground pumping unit, a traveling valve 30 in the third plunger 29 is closed during the upward stroke of the pumping unit, a fixed valve 20 at the bottom of the pumping unit 19 is opened, the third plunger 29, the first plunger 6 and the second plunger 27 are lifted together under the traction of the steel wire rope 7, liquid in an oil pipe 18 is lifted to a position of a positioning deflector 14 through the third plunger 29 which is lifted, a part of liquid enters an annular channel 4 between the outer working cylinder 2 and the inner working cylinder 1 through the positioning deflector 14, then finally flows into a ground transmission pipeline of an oil well through an oil pipe 9 and a four-way 3, the inside the oil pipe 18 reaches another part of the positioning deflector 14, the first plunger 6 and the second plunger 27 are lifted into the position of the inner working cylinder 1, and the first plunger 6 and the second plunger 27 are sealed in the inner working cylinder 1.
The movable valve 30 in the third plunger 29 is opened during the downstroke of the pumping unit, the fixed valve 20 at the bottom of the oil pump barrel 19 is closed, the third plunger 29, the first plunger 6 and the second plunger 27 descend together under the traction of the steel wire rope 7, the liquid in the oil pump barrel 19 enters the oil pipe 18 through the movable valve 30 in the third plunger 29, and part of the liquid entering the inner cavity of the inner working barrel 1 during the upstroke is discharged under the sealing action of the first plunger 6 and the second plunger 27 which descend, enters the annular channel 4 between the outer working barrel 2 and the inner working barrel 1 through the positioning deflector 14, and finally flows into the oil well ground gathering pipeline through the oil delivery channel 5 on the side wall of the oil pipe hanger 9 and the oil pipe four-way 3.
The oil extraction production of the upper and lower stroke cycles is completed by the pumping unit.
Claims (3)
1. The utility model provides an overlength stroke beam-pumping unit is dynamic sealing device in pit, including interior working cylinder, outer working cylinder and oil pipe cross, wherein outer working cylinder cover is established on interior working cylinder, be formed with annular channel between the inner wall of outer working cylinder and the outer wall of interior working cylinder, oil pipe cross cover is established at the top of interior working cylinder and outer working cylinder, annular channel between interior working cylinder and the outer working cylinder is linked together with the infusion passageway of oil pipe cross side, be provided with first plunger in the inner chamber of interior working cylinder, the top of first plunger is connected with wire rope, wire rope is connected with the hoist device on ground after passing the interior working cylinder in the oil pipe cross central channel, its characterized in that: the oil pipe four-way valve is characterized in that an oil pipe hanger is arranged in the oil pipe four-way valve, a liquid outlet is formed in the side face of the oil pipe hanger, the liquid outlet in the side face of the oil pipe hanger is communicated with a liquid delivery channel on the side face of the oil pipe four-way valve, the upper end and the lower end of the oil pipe hanger are sealed, the upper end of an inner working cylinder is connected with a hanging joint, a lower flange on the hanging joint is fixedly connected with an upper flange of the oil pipe four-way valve, a hanger is arranged in the hanging joint, the hanger and the oil pipe hanger are in concentric sealing hanging, an anti-spraying gate is assembled on the upper part of the anti-spraying gate, a steel wire rope passing through a central channel of the oil pipe four-way valve sequentially passes through the oil pipe hanger, the anti-spraying gate and the anti-static box and then is connected with a winding device on the ground, a connector is arranged between the lower end of the steel wire rope and the top of a first plunger in an inner working cylinder cavity, the connector comprises an upper cone and a lower cone, wedge die is arranged in the upper cone and the lower cone, the upper cone is connected with the upper cone through the connector, the top of the upper cone is provided with a locking cap, the bottom of the hanging joint is provided with a compression cap, the upper cone is provided with a third plunger, the compression cap is connected with the third plunger through the upper cone and the third plunger, and the third plunger is fixedly connected with the upper plunger;
the steel wire rope is connected with the first plunger, the second plunger, the sucker rod and the third plunger, the ultra-long stroke pumping unit draws the first plunger and the second plunger to synchronously reciprocate up and down in the inner cavity of the inner working cylinder through the steel wire rope, the third plunger also synchronously reciprocates up and down in the oil pump cylinder and the ground pumping unit, a traveling valve in the third plunger is closed during the upward stroke of the pumping unit, a fixed valve at the bottom of the oil pump cylinder is opened, the third plunger, the second plunger and the first plunger are lifted together under the traction of the steel wire rope, liquid in an oil pipe is lifted to a positioning deflector through the ascending third plunger, a part of liquid enters an annular channel between the outer working cylinder and the inner working cylinder through the positioning deflector and finally flows into an oil well ground gathering pipeline through an oil pipe hanger and an oil pipe four-way, the other part of liquid in the positioning deflector part in the oil pipe is moved into the inner working cylinder along with the first plunger and the second plunger, and the part of liquid is sealed in the inner working cylinder under the sealing effect of the first plunger and the second plunger;
the third plunger, the first plunger and the second plunger are downwards moved together under the traction of the steel wire rope, the liquid in the oil pump cylinder enters the oil pipe through the movable valve in the third plunger, and part of the liquid entering the inner cavity of the inner working cylinder during the upstroke is discharged under the sealing action of the downwards moving first plunger and the second plunger, enters the annular channel between the outer working cylinder and the inner working cylinder through the positioning deflector, and finally flows into the ground gathering pipeline of the oil well through the oil conveying channel on the side wall of the oil pipe hanger and the four-way oil pipe.
2. The downhole dynamic sealing device of an ultra-long stroke pumping unit according to claim 1, wherein: the upper part of the outer working cylinder is provided with a sleeve four-way joint at the lower part of the oil pipe four-way joint, and an upper flange at the top end of the sleeve four-way joint is fixedly connected with a lower flange at the bottom of the oil pipe four-way joint.
3. The downhole dynamic sealing device of an ultra-long stroke pumping unit according to claim 1, wherein: the bottom of outer working cylinder be provided with the location water conservancy diversion ware, the location water conservancy diversion ware comprises outer tube and inner tube, outer tube cover is established on the inner tube, the external diameter of outer tube corresponds with the external diameter of outer working cylinder, the internal diameter of inner tube corresponds with the external diameter of inner working cylinder, the passageway that forms between the outer wall of the inner wall of outer tube and inner tube is linked together with the annular passageway between outer working cylinder and the inner working cylinder, the inner working cylinder is linked together with the central passageway of location water conservancy diversion ware, the lower part of location water conservancy diversion ware has connected gradually oil pipe and oil pump section of thick bamboo, the bottom of oil pump section of thick bamboo is equipped with fixed valve.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110485971A (en) * | 2019-09-29 | 2019-11-22 | 大庆拓维石油科技开发有限公司 | The ball-screw pumping unit of down-hole drive |
| CN112610180A (en) * | 2020-10-20 | 2021-04-06 | 大庆拓维石油科技开发有限公司 | Long-stroke oil pumping machine installed at wellhead and underground sealing device |
| CN114059973B (en) * | 2021-11-25 | 2024-06-25 | 祥业能源有限公司 | Liquid draining device for oil-gas well |
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