CN111075401A - Gear suspension type parallel double-pump downhole oil production pipe column - Google Patents
Gear suspension type parallel double-pump downhole oil production pipe column Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 119
- 239000000725 suspension Substances 0.000 title claims abstract description 65
- 238000000605 extraction Methods 0.000 claims abstract description 42
- 239000003129 oil well Substances 0.000 claims description 55
- 238000005086 pumping Methods 0.000 claims description 34
- 230000008878 coupling Effects 0.000 claims description 13
- 238000010168 coupling process Methods 0.000 claims description 13
- 238000005859 coupling reaction Methods 0.000 claims description 13
- 230000009977 dual effect Effects 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 11
- 238000003780 insertion Methods 0.000 claims description 9
- 230000037431 insertion Effects 0.000 claims description 8
- 238000002627 tracheal intubation Methods 0.000 claims description 7
- 238000011144 upstream manufacturing Methods 0.000 claims description 5
- 230000003068 static effect Effects 0.000 abstract description 10
- 239000012530 fluid Substances 0.000 abstract description 8
- 229910052799 carbon Inorganic materials 0.000 abstract description 6
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- 238000009434 installation Methods 0.000 abstract 1
- 238000012856 packing Methods 0.000 description 20
- 239000007788 liquid Substances 0.000 description 15
- 238000011084 recovery Methods 0.000 description 11
- 238000005265 energy consumption Methods 0.000 description 8
- 238000003825 pressing Methods 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
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- 230000015572 biosynthetic process Effects 0.000 description 2
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- 239000010902 straw Substances 0.000 description 2
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- 230000000694 effects Effects 0.000 description 1
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- 230000006872 improvement Effects 0.000 description 1
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- 238000005065 mining Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/28—Counterweights, i.e. additional weights counterbalancing inertia forces induced by the reciprocating movement of masses in the system, e.g. of pistons attached to an engine crankshaft; Attaching or mounting same
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H19/00—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion
- F16H19/02—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion for interconverting rotary or oscillating motion and reciprocating motion
- F16H19/04—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion for interconverting rotary or oscillating motion and reciprocating motion comprising a rack
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Abstract
The invention discloses a gear suspension type parallel double-pump downhole oil production pipe column, which is characterized in that: the oil extraction rod column comprises two oil extraction rod columns which can be arranged in a single well, the weight of the two oil extraction rod columns is equal, the lower ends of the two oil extraction rod columns are matched and connected with a release type parallel double pump or matched with a double oil pipe type parallel double pump, polished rods at the upper ends of the two oil extraction rod columns extend out of the well mouth and are respectively connected with polished rod lifting racks, and the two polished rod lifting racks are respectively meshed with a driving gear arranged between the two polished rods, so that the two oil extraction rod columns can drive the two lifting racks to move up and down alternatively and balance the two groups of oil extraction rod columns, and a balance type flexible load-changing and balanced configuration structure is formed. The oil extraction rod columns of the oil extraction pipe column are approximately equal in weight, the sucker rods on two sides are arranged on the suspension points to form seesaws, the suspension point static loads of the double optical rods are approximately symmetrical, the driving gear only needs to play a role of slight inching lifting, the motor power can be approximately regarded as being completely used for lifting well fluid, the balance type flexible balance configuration of load changing is fixed, the motor installation power is smaller, the system efficiency is higher, and low-carbon lifting oil extraction is really realized.
Description
Technical Field
The invention relates to the technical field of oil exploitation, in particular to a gear suspension type parallel double-pump downhole oil production pipe column.
Background
Beam pumping unit lifting oil extraction has always been the dominant artificial lifting mode in the world oil industry. Compared with other lifting modes, the lifting device has the advantages of firmness, durability, high reliability of field working conditions, convenience in maintenance, high standardization degree, high universality and the like. The single pipe column matched with the beam pumping unit in the single-hole well is used for oil extraction, but the combination mode has inherent defects which cannot be overcome. Mainly comprises the following steps: the technical advantages of long-stroke and low-stroke production parameters cannot be fully exerted, the balance principle problem and the suspension point load fluctuation characteristic cause low load balance rate, heavy load starting of the motor, light load working, large torque fluctuation, uneven load of the upper stroke and the lower stroke, even negative torque, low efficiency and high energy consumption. Because the characteristics of the four-link transmission mechanism of the beam pumping unit are not changed essentially, the defects of large horsecar and high energy consumption cannot be fundamentally overcome, and the mechanical mining efficiency is limited in space improvement and energy-saving potential.
At present, the quantity of oil pumping units in each oil field in China is more than 35 thousands of units, the total installed capacity of a motor exceeds 1500 thousands of kilowatts, and the annual power consumption exceeds 250 hundred million degrees. The efficiency of the actual measurement machine acquisition system is only 25% -30%, and some efficiency is even lower than 25%, according to measurement and calculation, if the efficiency can be increased to 31%, the total annual energy saving potential can reach nearly two billion degrees. The novel low-energy-consumption lifting system and the method are researched and developed for meeting the planning and requirements of energy conservation and emission reduction of national industrial production and realizing low-carbon lifting oil production of an oil well.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a gear suspension type parallel double-pump downhole oil production pipe column capable of improving oil production efficiency and reducing lifting energy consumption aiming at the defects in the prior art.
The technical scheme adopted by the invention is as follows: parallel double pump downhole oil production tubular column of gear suspension type, its characterized in that: the oil extraction rod columns of the two oil extraction rod columns are equal in weight, polish rods at the upper ends of the two oil extraction rod columns extend out of a well head and are respectively connected with polish rod lifting racks, and the two polish rod lifting racks are meshed with a driving gear arranged between the two polish rods, so that the two polish rod lifting racks can drive the two lifting racks to move up and down alternately and balance the two groups of oil extraction rod columns, and a balance type variable-load flexible balance configuration structure is formed.
According to the technical scheme, the oil extraction rod column device is further provided with a suspension gear, the suspension gear is meshed with the two polished rod lifting racks respectively, the suspension gear is used for suspending the two oil extraction rod columns in a balanced mode, and the driving gear is used for driving the two lifting racks to move up and down alternately.
According to the technical scheme, the parallel double-pump downhole oil production string is a releasing pipeless double-rod type parallel double-pump downhole oil production string or a double-oil-pipe type parallel double-pump downhole oil production string.
According to the technical scheme, the releasing pipeless double-rod parallel double-pump downhole oil production string comprises two parallel rod-type oil-well pumps, two plungers of the two rod-type oil-well pumps are respectively connected with one oil pumping rod, the two oil pumping rods are respectively connected with corresponding polished rods to form two parallel oil production string bodies, two ends of a pump cylinder of the two rod-type oil-well pumps are respectively connected with a centralizer, and the centralizer positioned at the lower end is hermetically connected with a releasing intubation tube packer through an intubation tube.
According to the technical scheme, the lower ends of the pump cylinders of the two rod-type oil-well pumps are connected with the releasing type single-cannula packer through the tee-joint centralizing joint.
According to the technical scheme, the tee joint centering joint is internally provided with two channels communicated with the pump cylinders of the two rod-type oil well pumps, the lower part of the tee joint centering joint is provided with a central channel communicated with the central insertion pipe, and the central channel is communicated with the two channels to form a tee joint structure.
According to the technical scheme, the lower ends of the pump cylinders of the two rod-type oil-well pumps are hermetically matched with the releasing type double-cannula packer through the two-way centralizer.
According to the technical scheme, the releasing type double-insertion-pipe packer comprises a body, two holes and double-insertion-pipe sealing configuration are arranged in the body, and a packer rubber cylinder and a packer slip are arranged outside the body.
According to the technical scheme, the double-oil-pipe type parallel double-pump oil production pipe column comprises an oil well pump and an oil production rod column which are arranged in parallel, the upper end of each oil well pump cylinder is connected with an oil pipe, the lower end of each oil well pump cylinder is sequentially connected with a sieve pipe and a plug, the oil production rod column comprises a polished rod, an oil pumping rod and an oil well pump plunger which are sequentially connected, and the plunger at the bottom end of each oil production rod column is matched with the corresponding oil well pump cylinder.
According to the technical scheme, the oil pipes are connected through the oil pipe coupling, the oil pumping rods are connected through the oil pumping rod coupling, the oil well pump comprises an oil well pump cylinder, a fixed valve assembly is installed at the bottom of the oil well pump cylinder, a plunger assembly is matched inside the oil well pump cylinder, and the plunger assembly comprises an upper movable valve, a plunger and a lower movable valve.
According to the technical scheme, the two oil production pipes are arranged in parallel and symmetrically.
Because the parallel double-pump downhole oil production pipe is in the same position and under the same working condition and production parameters of the same well, the driving gear (or the suspension gear) is used as a balance support suspension point of the two oil production rod strings, the static loads of the symmetrical oil production rod strings on two sides of the suspension point are approximately equal, and the static loads and the balance of the balance structures are mutually in a balance relationship of a load structure and a balance weight structure. Therefore, the problems of incomplete matching and poor balance degree existing in the balance principle and structural design of the traditional pumping unit are well solved, wherein the characteristics of the pumping unit suspension point load self alternation and the dynamic change along with the formation energy of the stratum. And then make this beam-pumping unit motor work almost all be used for promoting the well fluid and have nothing to do with the weight of pole in the pit, can reduce motor installed power by a wide margin, complete machine load balancing rate and system efficiency obtain the promotion of matter, finally reduce beam-pumping unit oil recovery lifting energy consumption, realized "low carbon" in the true sense and lifted the oil recovery.
The beneficial effects obtained by the invention are as follows:
1. through setting up two oil recovery pole strings that oil recovery pole string weight is nearly equal, two oil recovery pole strings pass through drive gear (or suspension gear) balanced support, constitute "balance formula" variable load flexible balance configuration structure, so only need the drive power of motor to do one-way well fluid and promote for motor installed power is littleer, and system efficiency is higher, realizes "low carbon" in the true sense and lifts the oil recovery. The parallel double-pump downhole oil production string can also be designed in a completely symmetrical manner, so that sucker rod strings on two sides are in a 'see-saw' type structure at the suspension point, the static load of the suspension point of the double optical rods is approximately symmetrical, the gear suspension or the driving gear only needs to play a 'slight' inching lifting role, and the power of the motor can be approximately considered to be completely used for lifting well fluid (and equivalent 'neutral point' lower rod weight, friction force and the like). Therefore, the balance degree is improved by 'quality' (especially intermittent well outlet, intermittent pumping well and insufficient liquid supply well), the system efficiency is improved by more than 10% compared with the traditional system, and the lifting energy consumption is greatly reduced.
2. Realize the deep pumping of 'small rod and small pump', effectively release the potential of oil reservoir. The upper stroke and the lower stroke are symmetrically discharged, the original large pump can be averagely split into small symmetrical pumps under the same liquid production displacement, and the low-permeability low-energy oil reservoir deep pumping and excavating potential can be facilitated.
3. The lifting advantages of long stroke and slow stroke are better exerted. The stroke is convenient to adjust, and only the rotating number of turns of the mandrel (motor) needs to be changed, so that the height and the weight of the whole machine can be designed to be smaller (the stroke of the existing tower crane is not adjustable), the stroke frequency can be further adjusted to be smaller, and eccentric wear is reduced.
4. And the continuous liquid drainage and lifting are beneficial to relieving the sand production degree of the reservoir. The traditional intermittent pulse pumping generates a certain pulse oscillation effect on a reservoir stratum, and the sand production degree of the reservoir stratum can be aggravated to a certain degree, particularly for a low-yield low-liquid well with serious insufficient liquid supply. The novel lifting system drains liquid twice in one stroke, namely the up-down stroke is a continuous progressive liquid suction-liquid drainage process, and the liquid is supplied and drained from the shaft smoothly, so that the sand production is slowed down.
5. The modular balance weight can be symmetrically arranged on two sides, so that the universality of a new machine type is enhanced. The lifting device can prevent the other side from being incapable of normally starting pumping due to balance failure after the single-side rod is broken, and can be used for lifting the common oil production pipe in a biased mode.
Drawings
Fig. 1 is a schematic structural diagram (dual tubing type) of a gear suspension type parallel dual-pump downhole oil production tubing string provided by an embodiment of the invention.
Fig. 2 is a schematic structural diagram (release type) of a gear suspension type parallel double-pump downhole oil production pipe column provided by the embodiment of the invention.
Fig. 3 is a three-dimensional cross-sectional view of an independent liquid outlet production four-way double-optical rod oil recovery wellhead provided in an embodiment of the present invention.
Fig. 4 is a three-dimensional cross-sectional view of an integrated liquid-out production three-way double-optical-rod double-suspension oil production wellhead provided in the embodiment of the invention.
Fig. 5 is a perspective view of an assembly of a gear-suspended gear-driven mirror-image type double-suspension pumping unit provided in the embodiment of the present invention.
Fig. 6 is a plan view of a gear suspension-gear drive mirror image type double-suspension pumping unit provided in the embodiment of the present invention.
Fig. 7 is a sectional view taken along line a-a of fig. 6.
Fig. 8 is a side view of a gear-suspended gear-driven mirror-image type double-suspension pumping unit in an embodiment of the invention.
In the figure: 1-1, 1-2-polish rod anti-drop cap; 2-1, 2-polished rod; 3, a gear suspension gear drive type oil pumping machine main body; 4. 12-a polish rod guide pinch roller; 5-1, 5-2-polish rod lifting rack; 6-1, 6-2-rack roller guide rail; 7-1, 7-2-rack guide rail bolt; 8-suspension gear; 9-1, 9-2-polish rod lifting guide rail; 10. 10-1, 10-2-drive gear; 11-1, 11-2-rack bolt; 13-1, 13-2-double-optical-rod packing box gland; 14-1, 14-2-packing box body; 15-1, 15-2-packing box rubber; 16-double-optical-rod packing box end cover; 17-double-optical-rod packing box end cover bolt; 18-1, 18-2-production gates; 19-sealing the partition plate; 20-production of the cross; 21-producing the four-way bolt; 22-double hanging casing four-way; 23-1, 23-2-casing gate; 24-double-suspension sleeve four-way bolt; 25-a bushing joint; 26-1, 26-2-tubing coupling; 27-1, 27-2-oil pipe; 28-sucker rod coupling; 28-1, 28-2-sucker rod coupling; 29-sucker rod; 30-1, 30-2-upstream dynamic valve; 31-1, 31-2-plunger; 32-1, 32-2-downstream electrovalve; 33-1, 33-2-pump cylinder; 34-a sleeve; 34-1-casing blasthole; 35-1, 35-2-fixed valve; 36-1, 36-2-screen; 37-1, 37-2-plug; 38-double-optical-rod packing bin and adjusting screw rod of packing box; 39-a gearbox; 40-a gearbox input shaft pulley; 41-a belt; 42, a motor; 43-rack rail rollers; 48, producing a tee joint; 49. 50-double pump cylinder centralizer; 51-double cannula; 52-releasing type double-cannula packer; 54-three-way centralizing joint; 55-central cannula; 56-central cannula sealing ring; 57-release type single cannula packer; 57-1-packer rubber cylinder; 57-2-packer slips.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1 and 2, the present embodiment provides a gear-suspended parallel dual-pump downhole oil production string, which includes two oil production strings capable of being placed in a single well, the oil production strings of the two oil production strings have equal weight, plungers at the lower ends of the two oil production strings are matched with two parallel dual pumps or matched with a dual-oil-pipe parallel dual pump, polish rods at the upper ends of the two oil production strings extend out of a well mouth and are respectively connected with polish rod lifting racks (5-1,5-2), and the two polish rod lifting racks (5-1,5-2) are engaged with a driving gear 10 installed between the two polish rods, so that the two polish rod lifting racks can drive the two oil production strings to move up and down alternately and balance the weight of the two oil production strings, thereby forming a "balance type" variable load flexible balance configuration structure.
The invention is used in cooperation with a gear suspension gear driving type oil pumping unit, and realizes alternate oil extraction of two oil extraction pipes through the gear suspension gear driving type oil pumping unit. In this embodiment, the driving gear 10 is installed on the frame 3, the gear-suspended gear-driven pumping unit includes polish rod lifting guide rails (9-1,9-2) respectively fixedly connected with polish rod lifting racks, rack guide rails (6-1,6-2) respectively configured with the polish rod lifting guide rails, a motor 42, and a transmission case 39, the two rack guide rails (6-1,6-2) are installed on the frame 3, an output shaft of the motor 42 is connected with a transmission case input shaft belt wheel 40 through a belt 41, and the transmission case input shaft belt wheel 40 is connected with the driving gear 10.
In this embodiment, a hanging gear 8 is further disposed between the two polish rods on the bracket, the hanging gear 8 is respectively engaged with the two polish rod lifting racks (5-1,5-2), the hanging gear 8 is used as a hanging support balance structure (i.e. a support balance hanging point) of the two oil extraction rod columns, and the driving gear 10 is used for driving the two polish rods to alternately lift up and down for oil extraction, so that the manufacturing precision of the gear is further reduced. Wherein, the suspension gear 8 and the driving gear 10 are positioned on the symmetrical center line of the frame 3 and are arranged at intervals up and down.
At the moment, the suspension gear 8 is used as a balance supporting point of two oil extraction rod columns, the static load of the suspension point of the oil extraction rod is approximately symmetrical, the mirror image type double-suspension oil pumping unit only needs to play a 'one straw type' inching lifting role (the driving gear 10 plays an electric role), and the power of the motor is approximately regarded as being used for lifting well fluid.
In this embodiment, each oil production string may be symmetrically arranged or asymmetrically arranged, as long as the weight of the oil production rod strings on both sides is equal, and this embodiment takes the arrangement of two symmetric oil production strings as an example for description. Namely, as shown in fig. 1, two oil production strings are symmetrically arranged. The parallel double-pump underground oil production pipe column can adopt two structures of a double-oil pipe type and a releasing pipeless double-rod type. The dual tubing string may be suitable for large diameter casing, such as 7 inch or more casing, while the release tubeless dual-stem string may be suitable for casing between 5 inch and 7 inch, or more than 7 inch.
As shown in figure 1, the double-oil-pipe type parallel double-pump downhole oil production pipe comprises two oil production pipes with the same structure, and each oil production pipe comprises a polish rod anti-drop cap (1-1, 1-2); a polish rod (2-1, 2-2); tubing couplings (26-1, 26-2); oil pipes (27-1, 27-2); a sucker rod collar 28; a sucker rod 29; upstream dynamic valves (30-1, 30-2); plungers (31-1, 31-2); downstream electrovalves (32-1, 32-2); a pump cylinder (33-1, 33-2); fixed valves (35-1, 35-2); a screen (36-1, 36-2); the plugs (37-1, 37-2) will now be described by way of example of a specific configuration of one of the production strings. A specific configuration example of one of the production strings will be described. The oil pipe is installed through the double-optical-rod double-suspension oil extraction well head in a suspension mode, the oil pipe 27-1, the oil pumping pump barrel 33-4, the sieve pipe 36-1 and the plug 37-1 are sequentially connected from top to bottom, the oil pipes are connected through the oil pipe coupling 26-1, the oil pipe at the uppermost end is suspended through the double-optical-rod double-suspension oil extraction well head, the oil pipe at the lowermost end is connected with the oil well pump barrel 33-1, the weight of the oil pipe column is borne through the double-optical-rod double-suspension oil extraction well head, and the weight of the oil pipe column is borne through the suspension gear. The upper end of the polish rod 2-1 is connected with a polish rod anti-drop cap 1-1, the lower end is connected with a sucker rod 29, the sucker rods 29 are connected through sucker rod couplings 28, and the sucker rod 29 at the lowest end is connected with a plunger assembly. When the sucker rod is installed, the polish rod is connected with the sucker rod and the plunger assembly to form an oil extraction rod column which is placed in the oil pipe 27-1 until the oil pump cylinder 33-1. The oil well pump is in the prior art, the oil well pump comprises oil well pump cylinders, fixed valve assemblies (35-1 and 35-2) are respectively installed at the bottoms of the two oil well pump cylinders, a plunger assembly is respectively matched in the oil well pump cylinders, and the plunger assembly comprises an upper traveling valve 30, a plunger 31 and a lower traveling valve 32. . Polished rods (1-1, 1-2) at the upper ends of the two oil production strings are suspended through a suspension gear 8 and driven through a driving gear 10, and static loads of the oil production strings symmetrically arranged on two sides of the suspension gear 8 are approximately equal to form a balance type load-variable flexible balance configuration structure.
The releasing pipeless double-rod parallel double-pump downhole oil production string can adopt two structural forms according to the difference of the releasing intubation packer structure, and is divided into a releasing single intubation packer pipeless double-rod parallel double-pump downhole oil production string and a releasing double intubation packer pipeless double-rod parallel double-pump downhole oil production string.
As shown in fig. 2, the pipe-free dual-rod parallel dual-pump downhole production string of the releasing type dual-cannula packer comprises: the anti-drop device comprises polish rod anti-drop caps (1-1 and 1-2), polish rods (2-1 and 2-2), sucker rod coupling rings (28-1 and 28-2), sucker rods (29-1 and 29-2), a double-pump-barrel centralizer 49, a two-rod oil well pump, a double-pump-barrel centralizer 50, a double-cannula 51, a throw-off double-cannula packer 52, a central-cannula sealing ring, a throw-off single-cannula packer, a packer rubber barrel and a packer slip, wherein the two ends of a pump barrel of the two-rod oil well pump are respectively connected with the double-pump-barrel centralizer 49 and a three-way centralizer joint 54, and a plunger assembly of the two-rod oil well pump is packaged in the pump barrel and is the prior art. Upstream movable valves (30-1, 30-2) are respectively arranged in the pump cylinders of the two rod-type oil-well pumps; plungers (31-1, 31-2); downstream electrovalves (32-1, 32-2); fixed valves (35-1, 35-2). The plungers (31-1, 31-2) of the two rod type oil well pumps are respectively connected with one oil well pump rod (29-1, 29-2), and the two oil well pump rods are respectively connected with the corresponding polish rods (2-1, 2-2) to form two oil well rod columns which are arranged in parallel. The structure difference of the double-cylinder pump centralizer and the existing single-cylinder pump centralizer is that double holes for two sucker rod columns to pass through are arranged on the body of the centralizer, and other structures are basically consistent. The lower end of the dual barrel centralizer 50 is connected to a throw-away dual cannula packer 52 by a dual cannula 51. The double insertion pipe 51 is a double insertion pipe 51 hermetically inserted with double center holes of the double-pump-cylinder centralizer 49, and is a parallel structure of two parallel single insertion pipes in the prior art. The releasing type double-cannula packer 52 comprises a body, two holes are formed in the body and are matched with a double-cannula 51, a packer rubber cylinder 52-1 and a packer slip 52-2 are arranged outside the body, the difference between the releasing type double-cannula packer 52 and the existing packer is that two holes are formed inside the body and are matched with the double-cannula 51, and the rest structures are the same. The releasing type double-cannula packer pipeless double-rod parallel double-pump downhole oil production pipe column is put into the shaft to adopt two operations: running a releasing double-cannula packer 52 with a tubing string for the first time, then pressing the setting and releasing the packer; after the tubing string is taken out, the tubing string is used for the second time to drive two oil extraction rod columns, a rod-type oil well pump and a double-insertion pipe 51 to go down, then the packer double-sealing pipe is inserted, and then the packer double-sealing pipe is pressed to release the double pump cylinders; after the tubing string is pulled out. The operations of tool setting and releasing, pressing and releasing are all provided with corresponding technical standards.
Wherein, the double-tube type supporting centralizer is inserted into the double-tube type supporting centralizer at intervals during the synchronous lifting operation of the double tubes, the double rods and the double pumps for preventing twisting and blocking.
The parallel double-pump downhole oil production pipe of pipe-free double-rod of releasing formula single cannula packer includes: polish rod anti-drop caps (1-1, 1-2), polish rods (2-1, 2-2), sucker rod couplings (28-1, 28-2), sucker rods (29-1, 29-2), a double-pump-barrel centralizer 49, a two-rod oil well pump, a three-way centralizing joint 54, a central insertion pipe 55, a central insertion pipe sealing ring 56, a throw-away single-insertion-pipe packer 57, a packer rubber barrel 57-1 and a packer slip 57-2. The two ends of the pump cylinder of the two-rod oil well pump are respectively connected with a double-pump cylinder centralizer 49 and a three-way centralizing joint 54, and the plunger assembly of the two-rod oil well pump is packaged in the pump cylinder and is the prior art. Upstream movable valves (30-1, 30-2) are respectively arranged in the pump cylinders of the two rod-type oil-well pumps; plungers (31-1, 31-2); downstream electrovalves (32-1, 32-2); fixed valves (35-1, 35-2). The plungers (31-1, 31-2) of the two rod type oil well pumps are respectively connected with one oil well pump rod (29-1, 29-2), and the two oil well pump rods are respectively connected with the corresponding polish rods (2-1, 2-2) to form two oil well rod columns which are arranged in parallel. The lower end of the three-way centralizing coupling 54 is sealingly mated to a single throw-away cannula packer 57 via a single cannula (center cannula) 55. The well descending steps are similar to the well descending steps of the pipe-free double-rod parallel double-pump downhole oil production pipe column of the releasing type double-cannula packer, and are not described again.
Specifically, the three-way centering joint 54 has a structure as shown in fig. 2, and has a dual channel therein, which is communicated with the pump cylinders of the two-rod oil-well pump, and a central channel at the lower part thereof, which is communicated with the central insertion tube 55, wherein the central channel is communicated with the dual channel to form a three-way structure. The single-stinger packer 57 of the present embodiment may be an existing stinger packer.
The oil production pipe column is configured with a double-light-rod double-suspension oil production well head, wherein the double-light-rod double-suspension oil production well head is divided into an independent liquid-outlet production four-way double-light-rod double-suspension oil production well head and an integrated liquid-outlet production three-way double-light-rod double-suspension oil production well head. The independent liquid-outlet production four-way double-light-rod double-suspension oil production well head is configured with the double-oil-pipe type parallel double-pump downhole oil production pipe column, and the integrated liquid-outlet production three-way double-light-rod double-suspension oil production well head is correspondingly configured with the releasing pipeless double-rod type parallel double-pump downhole oil production pipe column.
Wherein, as shown in fig. 3, the independent liquid outlet type production four-way double-optical rod double-suspension oil production wellhead comprises: the double-light-rod packing box matched with the double light rods comprises two packing box bodies (14-1 and 14-2) arranged in parallel, a light rod correspondingly penetrates through the interior of each packing box body, a packing box rubber sheet 15 is arranged in each packing box body, the upper end of each packing box body is tightly pressed through a double-light-rod packing box gland 13, the lower end of each packing box body is fastened at the upper end of the production four-way 20 through a double-light-rod packing box end cover 16 and a double-light-rod packing box end cover bolt 17, and double-light-rod packing box filling bins and adjusting screw rods 38 are respectively arranged on the packing box bodies (14-1 and 14-2) and used for adjusting the sealing performance. The dynamic seal of the polish rod and the packing box can be of a standard structure. Two production channels corresponding to the double-oil-pipe type parallel double-pump downhole oil production pipe column in the production four-way joint 20 are provided with longitudinally arranged sealing partition plates 19 for dividing the production four-way joint 20 into two independent cavities, and the two independent cavities in the production four-way joint 20 are respectively communicated with a production gate 18-1 and a production gate 18-2 to realize independent liquid outlet at two sides; the lower end of the production cross 20 is connected with a double-suspension casing cross 22 through a production cross bolt 21, two sides of the double-suspension casing cross 22 are respectively connected with a casing gate 23-1 and a casing gate 23-2, and the double-suspension casing cross 22 is connected with a casing connector 25 through a double-suspension casing cross bolt 24. The double-hanging casing four-way joint 22 is formed by connecting two parallel hanging casing four-ways in the prior art. The double-optical-rod wellhead in the embodiment of the device is provided with independent liquid outlets on two sides, if a single-side pipe column is abnormal, only the single-side pipe column is reduced to be a counterweight, and the single pump on the other side can be used for continuing production with similar discharge capacity after the stroke or stroke is increased, so that the device is more reliable in work, and is beneficial to prolonging and free of maintenance.
As shown in fig. 4, the integrated liquid-out production three-way double-optical-rod double-suspension oil production wellhead is used for being configured with a releasing pipeless double-rod parallel double-pump downhole oil production pipe column. The production tee joint is replaced by the production tee joint 48, a sealing plate is not arranged in the production tee joint 48, namely, one side of the production tee joint 48 is provided with the production gate 18, and liquid is discharged from one side, so that the structure is more compact, and the applicability is better.
Because the static loads of the symmetrical sucker rod strings at two sides of the suspension gear are approximately equal under the same working condition and production parameters of the same well where the parallel double-pump downhole oil production string is located, and the static loads are in a balance relation of a similar balance structure of load and balance weight. Therefore, the problems of incomplete matching and poor balance degree existing in the balance principle and structural design of the traditional pumping unit are well solved, wherein the characteristics of the pumping unit suspension point load self alternation and the dynamic change along with the formation energy of the stratum. And then make the motor work almost all be used for promoting the well fluid and have nothing to do with the weight of pole in the pit, can reduce the installed power by a wide margin, complete machine load balancing rate and system efficiency obtain the promotion of matter, finally reduce the machine and adopted the energy consumption of lifting, realized "low carbon" in the true sense and lifted the oil recovery.
Specifically, as shown in fig. 5-8, the suspension gear 8 is mounted on the frame 3 through a bearing and is located between the two polish rods, at this time, the suspension gear 8 is used as a balance support point (i.e., a weight support point) of the two oil production strings, the static load of the polish rod suspension point is approximately symmetrical, at this time, the driving gear only needs to perform a rice straw type inching lifting action, and the motor power is approximately regarded as being used for lifting well fluid. In this embodiment, the rack rail 6 is a rack roller rail. The reversing driving gear 10 is respectively meshed with the polish rod lifting rack 5-1 and the polish rod lifting rack 5-2, and a longitudinal convex ridge is arranged on each polish rod lifting guide rail 9 and is matched with the roller in the rack roller guide rail 6, so that the polish rod lifting guide rail runs smoothly. The rack roller guide rails (6-1,6-2) are respectively fixed on the rack 3 through rack guide rail bolts (7-1, 7-2). Slip teeth are arranged in the polish rod lifting rack and the polish rod lifting guide rail and used for biting and fixing the polish rod. When the oil extraction device works, the driving gear 10 is matched with the two polished rod lifting racks (5-1 and 5-2) through the driving of the motor to drive the pipe column on one side to move downwards and the pipe column on the other side to move upwards, so that the alternate oil extraction is realized. In addition, in order to adapt to casings with different calibers and oil production pipes with different outer diameters, a T-shaped groove is further formed in the frame 3, and rack and roller guide rails (6-1 and 6-2) are arranged in the T-shaped groove and are adjusted and fixed through rack and roller guide bolts (7-1 and 7-2) respectively so as to be adjusted according to different working conditions. In order to enable the stability of the two parallel polish rods to be better, the polish rod guide pinch roller 4 and the polish rod guide pinch roller 12 are arranged on the support frame and are respectively positioned above and below the two polish rods, the polish rod guide pinch roller 4 and the polish rod guide pinch roller 12 are respectively arranged on the support frame 3 through bearings and can rotate at will in 360 degrees, and after a proper angle is adjusted, the polish rod guide pinch roller and the polish rod guide pinch roller are locked through a locking device, so that the practical performance of the polish rod guide pinch roller is enhanced. The structure of the device is shown in the figure, and the device comprises a pressing wheel frame, pressing wheels are symmetrically arranged on two sides of the pressing wheel frame, and locking devices are correspondingly arranged on a supporting frame.
Through setting up two sets of oil recovery poles that weight is nearly equal, two sets of oil recovery poles pass through drive gear or hang the gear balanced support, constitute "balance formula" and become the flexible balanced configuration structure of load for motor installed power is littleer, and system efficiency is higher, realizes "low carbon" in the true sense and lifts the oil recovery. The parallel double-pump underground oil production pipe is designed to be completely symmetrical, the sucker rods on two sides are in a 'see-saw' type structure at the suspension points, the static load of the suspension points of the double optical rods is approximately symmetrical, the driving gear only needs to play a role of 'slight' inching lifting, and the motor power of the oil pumping unit can be approximately regarded as being completely used for lifting well fluid (and equivalent 'neutral point' lower part rod weight, friction force and the like). Therefore, the balance degree is improved by 'quality' (especially intermittent well outlet, intermittent pumping well and insufficient liquid supply well), the system efficiency is improved by more than 10% compared with the traditional system, and the lifting energy consumption is greatly reduced.
Claims (11)
1. Parallel double pump downhole oil production tubular column of gear suspension type, its characterized in that: the oil extraction rod columns of the two oil extraction rod columns are equal in weight, polish rods at the upper ends of the two oil extraction rod columns extend out of a well head and are respectively connected with polish rod lifting racks, and the two polish rod lifting racks are meshed with a driving gear arranged between the two polish rods, so that the two polish rod lifting racks can drive the two lifting racks to move up and down alternately and balance the two groups of oil extraction rod columns, and a balance type variable-load flexible balance configuration structure is formed.
2. The gear-suspended parallel dual-pump downhole production string according to claim 1, wherein: the oil extraction rod column is characterized by further comprising a suspension gear, the suspension gear is meshed with the two polished rod lifting racks respectively, the suspension gear is used for suspending the two oil extraction rod columns in a balanced mode, and the driving gear is used for driving the two lifting racks to move up and down alternately.
3. A gear suspended parallel dual pump downhole production string according to claim 1 or 2, wherein: the parallel double-pump downhole oil production string is a releasing pipeless double-rod type parallel double-pump downhole oil production string or a double-oil-pipe type parallel double-pump downhole oil production string.
4. The gear-suspended parallel dual-pump downhole production string according to claim 3, wherein: the under well oil extraction pipe column of the releasing pipeless double-rod parallel double-pump comprises two parallel rod oil-well pumps, two plungers of the two rod oil-well pumps are respectively connected with an oil pumping rod, the two oil pumping rods are respectively connected with corresponding polished rods to form two parallel oil extraction rod columns, two ends of a pump cylinder of the two rod oil-well pumps are both connected with centralizers, and the centralizers at the lower ends are hermetically connected with a releasing intubation packer through intubation tubes.
5. The gear-suspended parallel dual-pump downhole production string according to claim 4, wherein: the lower ends of the pump cylinders of the two rod-type oil-well pumps are hermetically connected with the releasing type single-cannula packer through a tee-joint centralizing joint.
6. The gear-suspended parallel dual-pump downhole production string according to claim 5, wherein: the tee joint centralizing joint is internally provided with two channels communicated with the pump cylinders of the two rod-type oil well pumps, the lower part of the tee joint centralizing joint is provided with a central channel communicated with the central insertion tube, and the central channel is communicated with the two channels to form a tee joint structure.
7. The gear-suspended parallel dual-pump downhole production string according to claim 4, wherein: the lower ends of the pump cylinders of the two rod-type oil-well pumps are hermetically matched with the releasing type double-cannula packer through a two-way centralizer.
8. The gear-suspended parallel dual-pump downhole production string according to claim 7, wherein: the releasing type double-insertion-pipe packer comprises a body, two holes and double-insertion-pipe sealing configurations are arranged in the body, and a packer rubber cylinder and a packer slip are arranged outside the body.
9. A gear suspended parallel dual pump downhole production string according to claim 1 or 2, wherein: the double-oil-pipe type parallel double-pump oil production pipe column comprises an oil well pump and an oil extraction rod column which are arranged in parallel, wherein the upper end of each oil well pump cylinder is connected with an oil pipe, the lower end of each oil well pump cylinder is sequentially connected with a sieve pipe and a plug, the oil extraction rod column comprises a polished rod, an oil pumping rod and an oil well pump plunger which are sequentially connected, and the plunger at the bottom end of each oil extraction rod column is matched with the corresponding oil well pump cylinder.
10. The gear-suspended parallel dual-pump downhole production string according to claim 8, wherein: the oil pipes are connected through oil pipe coupling, the sucker rods are connected through sucker rod coupling, the oil well pump comprises an oil well pump cylinder, a fixed valve assembly is installed at the bottom of the oil well pump cylinder, a plunger assembly is matched inside the oil well pump cylinder, and the plunger assembly comprises an upstream movable valve, a plunger and a downstream movable valve.
11. A gear suspended parallel dual pump downhole production string according to claim 1 or 2, wherein: the two oil production pipes are arranged in parallel and symmetrically.
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Address after: 100728 No. 22 North Main Street, Chaoyang District, Beijing, Chaoyangmen Patentee after: CHINA PETROLEUM & CHEMICAL Corp. Patentee after: Jianghan oil field factory of Jianghan Oilfield Branch Company of China Petroleum Chemical Co. Address before: 100728 No. 22 North Main Street, Chaoyang District, Beijing, Chaoyangmen Patentee before: CHINA PETROLEUM & CHEMICAL Corp. Patentee before: Jianghan Oil Production Plant of SINOPEC Jianghan Oilfield Co. |
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Effective date of registration: 20220901 Address after: 100728 No. 22 North Main Street, Chaoyang District, Beijing, Chaoyangmen Patentee after: CHINA PETROLEUM & CHEMICAL Corp. Patentee after: Jianghan oil field factory of Jianghan Oilfield Branch Company of China Petroleum Chemical Co. Patentee after: Sinopec Engineering Quality Monitoring Co.,Ltd. Address before: 100728 No. 22 North Main Street, Chaoyang District, Beijing, Chaoyangmen Patentee before: CHINA PETROLEUM & CHEMICAL Corp. Patentee before: Jianghan oil field factory of Jianghan Oilfield Branch Company of China Petroleum Chemical Co. |