CN101672274B - Easily-installed adjustable type underground double-screw gas-liquid mixed pumping pump - Google Patents

Abstract

The invention relates to an oil extraction machine, in particular to an easily-installed adjustable type underground double-screw gas-liquid mixed pumping pump. The top and the bottom of each section are respectively thrusted by a bearing set, thereby dispersing the axial force of a pump assembly and prolonging the service life of the bearing. In order to conveniently installing a plurality of sections of pumps in series connection, a slide sleeve type structure and a semi-thread and semi-spline sleeve structure are adopted. In order to conveniently install a single section of pump and adjust gaps, an inner shell is provided with two rectangular holes, one helical casing is fixed while the other helical casing moves along the axial direction, and a meshing gap between two helical casings is adjusted to be proper by adjusting compression nuts at two ends of the helical casings. Compared with the other mechanical oil extraction devices, the oil extraction machine has the characteristics of high lift, small discharge amount and high efficiency for conveying high-viscosity fluid, can successfully solve the more and more exploitation problems of current thick oil wells, wells containing high content of gasoline, low-yield oil wells and oil wells with certain sand content. The invention is mainly used for exploiting thick oil wells, wells containing high content of gasoline, low-yield oil wells and oil wells with certain sand content.

Description

The easily-installed adjustable type underground double-screw gas-liquid mixed pumping pump

Technical field

The present invention relates to a kind of oil recovery machiner, particularly be easy to install the underground double-screw gas-liquid mixed pumping pump of adjusting, be used for the exploitation of viscous crude, high gassiness, low yield and certain sand content oil well.

Background technique

At present, most of oil gas fields have entered the exploitation middle and later periods in the world wide, and existing conventional mechanical oil production equipment can't well solve the technical barrier of increasing viscous crude, high gassiness, low yield and certain sand content oil well.Therefore, urgent need can adapt to the novel mechanical oil production equipment of these complex working conditions.Two screw pump is other mechanical oil recovery equip ment relatively, has the proof gold attribute, can carry out the viscous crude high-temp thermal recovery, be more suitable for the conveying of high gas-liquid ratio, highly viscous fluid, and, it also has little discharge capacity, high-lift, conveying highly viscous fluid high-efficiency characteristics, can adapt to the exploitation of above-mentioned complex working condition oil well preferably.Yet, the concentrated push-type of being researched and developed in recent years of downhole double screw pump employing, the bearing bearing load is excessive, and bearing life is short; Self-balancing type, need on pump case, process special runner, the manufacturing difficulty is too big.And existing dispersion push-type, the more piece pump is not easy to be installed in series, and the two screw rods back lash is difficult to regulate, and can not bear axial force upwards, is difficult to apply in the oil field.

Summary of the invention

Technical problem to be solved by this invention is: existing dispersion push-type underground double-screw gas-liquid mixed pumping pump can not bear axial force upwards, and the two screw rods back lash is difficult to regulate, and the more piece pump is not easy to be installed in series.

The technical solution adopted in the present invention is:

As shown in Figure 1, structure of the present invention is mainly by partial thread half spline housing (1), little gland nut (2), sliding sleeve (3), connecting sleeve (4), outlet connection (5), frame (6), upper bearing bracket (7), upper bearing (metal) group (8), middle gland nut (9), inner housing (10), left-handed screw-casing (11), big gland nut (12), step (13), lower bearing group (14), inlet attack (15), pump shaft (16), high temperature resistant " zero " RunddichtringO (17), (22), (23), (24), bearing shim (18), short clamp sleeve (19), right hand helix cover (20), long clamp sleeve (21), pump shaft (25), spline housing (26), flat key (27), locating stud compositions such as (28).

For the ease of being installed in series of more piece pump, partial thread half spline housing structure and sliding bush type structure have been adopted.Partial thread half spline housing (1) is a kind of special connecting sleeve that has internal thread and internal spline.The sliding bush type structure is made up of sliding sleeve (3) and connecting sleeve (4).One end of connecting sleeve (4) links up by screw thread and delivery side of pump joint (5), and the other end links up by screw thread and sliding sleeve (3); One end of sliding sleeve (3) links up by the inlet attack (15) of screw thread and another joint pump, and the other end links up by screw thread and connecting sleeve (4).

Adjusting for the ease of two screw-casing back lashes, right hand helix cover (20) is fixing, left-handed screw-casing (11) is compressed by middle gland nut (9), short clamp sleeve (19) and big gland nut (12), can make the left and right screw-casing back lash of revolving become suitable by gland nut (9) in regulating and big gland nut (12).

Because fluid impacts or the phase sequence of oil-submersible motor connects and causes the two screw rods play that makes progress on the contrary, add a thrust bearing group and a thrust shaft block on the top of pump shaft, i.e. upper bearing (metal) group (8) and upper bearing bracket (7) in order to prevent from just to start shooting.

Description of drawings

Fig. 1 is integrally-built generalized section and three partial sectional views of single-unit pump of the present invention.

Fig. 2 is that the F-F of Fig. 1 is to generalized section.

Fig. 3 is the overall structure generalized section after the two joint series connections of pumps.

Fig. 4 is the partial thread half spline housing structure of Fig. 3 and the partial enlarged view of sliding bush type structure

Embodiment

The present invention relies on synchromesh gear to drive two pump shafts, make two pump shafts do reverse synchronous rotation (according to right-hand man's rule, the left hand screw cover is done and is rotated counterclockwise during proper functioning), two screw-casings are meshing with each other and synchronously rotate under the drive of pump shaft, suction side at pump produces certain degree of vacuum, make working fluid under the effect of atmospheric pressure, arrive the suction side of pump through the oil-through hole of step (13) by suction port, then working fluid enters the spiral chute of two screw-casings and inner housing formation, spiral chute is separated by the theoretical Line of contact of intermeshing screw-casing, become independently Seal cage, along with synchronous the carrying out of rotating of pump shaft, each Seal cage is constantly upwards passed, up to the exhaust end of pump, heterogeneous fluid is discharged from the oil-through hole of upper bearing bracket (7), finish the pressurization of single-unit pump to working fluid, then, working fluid enters the second joint pump, finishes same pressurization, to the last a joint.When the more piece series connection of pumps was used, along with the increase of pump joint number, the pressure that the more piece pump produces constantly increased.

The installation of single-unit pump and the regulating method in gap:

The whole erection process is all carried out under level.At first, successively flat key (27), right hand helix cover (20) and long clamp sleeve (21) are contained on the pump shaft (25).A short clamp sleeve (19) is contained on the pump shaft (16), loads onto another flat key, left-handed screw-casing (11) and another short clamp sleeve more successively.Then, the parallel placement of two pump shafts, and rotate two pump shafts synchronously and make two screw-casings be in engagement.Respectively two middle gland nuts (9) and two big gland nuts (12) are screwed on the pump shaft (16), but do not twist dead.Upper bearing (metal) group (8), lower bearing group (14) are contained in the two ends of two pump shafts respectively, and load onto two bearing shims (18) respectively.Then, be placed on step (13) on the special-purpose Laboratory Furniture of two screw pump and locate, two pump shafts that assembled are installed to step (13) lining, promptly lower bearing group (14) is put into step (13) lining, refill inner housing (10) and upper bearing bracket (7).Locate by locating stud (28) between step (13), inner housing (10) and upper bearing bracket (7) three.Specially add the upper and lower end that clamping tool is enclosed within two pump shafts to two, and afterburning step (13), inner housing (10) and upper bearing bracket (7) three are compressed makes not play vertically of two pump shafts.Rotate two pump shafts synchronously with hand earlier, answer easy and flexible, fluent phenomenon.If frictional force is too big in the time of can't rotating or rotate, middle gland nut (9) and the big gland nut (12) of regulating left pump shaft two ends make that the back lash between two screw-casings is suitable.Test with standard electromotor again, if the back lash between two screw-casings is suitable, just middle gland nut (9) and big gland nut (12) are tightened (when nutting, will note: tighten the gland nut of screwing on for the first time with 80% of the screw-down torque of stipulating earlier, tighten the gland nut of screwing on for the second time with 100% screw-down torque again).If improper, gland nut (9) and big gland nut (12) in regulating are till the back lash between two screw-casings is suitable again.Refill frame (6).High temperature resistant " zero " RunddichtringO (17), (22) are enclosed within on the inlet attack (15), more high temperature resistant " zero " RunddichtringO (22) are enclosed within on the outlet connection (5), and inlet attack (15) upward and on the outlet connection (5) is screwed on the inner housing (10).Afterwards, take off two special clamping tools that add.Sliding sleeve (3) is enclosed within (4) on the connecting sleeve, and on connecting sleeve (4), adds high temperature resistant " zero " RunddichtringO (23), (24), connecting sleeve (4) and outlet connection (5) are linked up by screw thread.Two little gland nuts (2) are contained on the pump shaft (16), partial thread half spline housing (1) are screwed on the pump shaft (16) again, spline housing (26) is contained on the pump shaft (25).So far, a joint pump assembling finishes.

The installation method of more piece pump:

In the following installation process, the pump shaft that left-handed screw-casing is housed in the pump is called left pump shaft; The pump shaft that the right hand helix cover is housed is called right pump shaft.At first,, and make first segment delivery side of pump joint relative with the inlet attack of the second joint pump with two joint pump horizontal positioned, and the left and right pump shaft of the corresponding first segment pump of left and right pump shaft difference of the second joint pump.Then, the spline housing on the first segment pump is pulled out about 15cm, at this moment, the total length that right pump shaft adds spline housing is about 15cm than the total length that left pump shaft adds partial thread half spline housing.Then, make the second joint pump slowly close to the first segment pump vertically, when the spline on the right pump shaft of the second joint pump just will contact with the spline housing on the right pump shaft of first segment pump, rotate two pump shafts of the second joint pump simultaneously with hand, the tooth of spline and the teeth groove of spline housing are aligned, and spline is injected in the spline housing.Make the second joint pump continue to the first segment pump slowly close vertically, when the spline on the second joint pump left side pump shaft just will contact with partial thread half spline housing on the pump shaft of a first segment pump left side, rotate partial thread half spline housing, the teeth groove of partial thread half spline housing and the tooth of spline are aligned, and spline is injected in partial thread half spline housing.Continue to make second the joint pump close to first segment vertically, until can not near till.According to the method for twisting gland nut in the assembly process of single-unit pump, two little gland nuts are tightened.At last, with sliding sleeve slide into second the joint pump the inlet attack place, by screw thread with sliding sleeve and second the joint pump inlet attack link up.So far, the first segment pump and the second joint pump installs.Refill the 3rd joint during pump, it should with the second joint series connection of pumps.And that the second joint pump and the 3rd saves the installation method of the installation method of pump and first and second joint is the same.By that analogy, refill the 4th joint pump, the 5th joint pump ..., total joint number of institute's armored pump is by pump degree of depth decision down.

Attention:, therefore, look down the direction of rotation of the left side pump shaft when sense of rotation when partial thread half spline housing is screwed on the left pump shaft should be with pump work owing to will lean on spline pair and screw pair to come transferring power between pump and the pump by outlet connection.

The present invention compares with existing dispersion push-type downhole double screw pump has following advantage:

1. existing dispersion push-type downhole double screw pump is to come transferring power by spline pair after the more piece series connection of pumps. , there is error man-hour in actual adding, is difficult to two splines are all injected in the spline housing. And the present invention is designed to half-thread half spline housing with one of them spline housing, and has adopted the sleeve type structure, so that being installed in series of more piece pump becomes easy.

2. owing to there is mismachining tolerance, the back lash of single-unit pump two screw-casings after assembling can become improper unavoidably. For existing dispersion push-type downhole double screw pump, want to adjust the back lash and must take pump apart, change and ressemble after screw-casing is adjusted pad. Therefore, must repeated disassembled and assembled until the back lash suitable till. And the present invention can be in assembling process the Mesh Clearance Adjustment with two screw-casings good.

3. existing dispersion push-type downhole double screw pump can not bear axial force upwards, the two screw rods play that can under the effect of the axial force that makes progress, make progress, thereby cause the back lash of two good screw-casings of adjusted to change, and the present invention can bear axial force upwards.

Claims (2)

1. easily-installed adjustable type underground double-screw gas-liquid mixed pumping pump, by inlet attack (15), lower bearing group (14), step (13), inner housing (10), frame (6), left-handed screw-casing (11), right hand helix cover (20), upper bearing (metal) group (8), upper bearing bracket (7), outlet connection (5), partial thread half spline housing (1), sliding sleeve (3), connecting sleeve (4), pump shaft (16,25) form, the use of can connecting of more piece pump, it is characterized in that: adopted partial thread half spline housing structure and sliding bush type structure to make the more piece pump be easy to be installed in series, wherein, half of partial thread half spline housing (1) is internal spline, and second half is an internal thread; The sliding bush type structure is made up of sliding sleeve (3) and connecting sleeve (4), one end of connecting sleeve (4) links up by screw thread and delivery side of pump joint (5), the other end links up by screw thread and sliding sleeve (3), one end of sliding sleeve (3) links up by the inlet attack (15) of screw thread and another joint pump, and the other end links up by screw thread and connecting sleeve (4); By regulate two middle gland nuts (9) and two big gland nuts (12) can in assembly process, adjust the back lash of two screw-casings suitable; Having added upper bearing (metal) group (8) and upper bearing bracket (7) in every joint pump makes pump can bear axial force upwards.

2. easily-installed adjustable type underground double-screw gas-liquid mixed pumping pump according to claim 1, it is characterized in that: right-hand screw cover (20) is fixed on the pump shaft (25), left hand screw cover (11) carries out axially locating by two short clamp sleeves (19), two middle gland nuts (9) and two big gland nuts (12), and has two rectangular openings on inner housing (10).

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