CN108412444B - Rodless Pump Hydraulic Wax Remover Wellhead Putting and Recovery Device - Google Patents

Abstract

The utility model relates to a wellhead throwing recovery device for a rodless pump hydraulic wax remover. The main purpose is to use the device to realize the launch and recovery of the rodless pump oil production well hydraulic automatic wax removal device at the wellhead. It is characterized in that it consists of upper and lower parts, the upper part is a hydraulic cylinder, the lower part is a wax remover recovery unit, and the telescopic hydraulic cylinder is used to push the hydraulic wax remover downward; the hydraulic cylinder connects with the lower part through the flanged cylinder. The wax remover recovery unit is connected, and the wax remover recovery unit is mainly composed of a retractable cylinder, a slide tube, a slip ring, a spring pin, etc.; wherein, the track pin passes through the slip ring and is placed in the track of the slide tube, and the slide tube unfolds into two structures: Different lengths of tracks, under the action of the hydraulic wax remover, the sliding tube can move up and down, the slip ring is fixed by the lower flange and the first-stage retractable barrel; the spring pin structure is composed of the lower flange, steel ball, compression spring , sealing ring, side bolts, and the spring pin structure is used to block the wax remover at the beginning and after the third wax removal of the wax remover.

Description

Rodless Pump Hydraulic Wax Remover Wellhead Putting and Recovery Device

Technical field:

The invention relates to a wellhead hydraulic wax remover feeding and recovery device, which can be applied to the mechanical wax removal process of oil wells to realize automation.

Background technique:

At present, the exploitation of various oil fields has entered the middle and late stages, and the output of waxy crude oil has increased rapidly. During the oil production process, the wax dissolved in the crude oil will be precipitated in the form of crystals and adsorbed on the tubing and downhole equipment. The lifting cross-section becomes smaller, which increases the local resistance of the fluid, and also affects the normal operation of oil well equipment, which greatly increases the cost of oil production in the oil field. Nowadays, electric submersible pumps are commonly used in oil fields. With the continuous development of submersible screw pumps and downhole linear motor oil production system technology, the number of rodless pump pumping wells is increasing. The rodless pump oil production method has changed the liquid flow in the original pipe string Transportation conditions also increase the chance of wax formation. Aiming at the problem of wax deposition in rodless pump well tubing, a hydraulic wax removal device was designed and an invention patent was applied for. During the wax removal process, the hydraulic wax removal device controls the wax removal by changing the annular flow area formed in the tubing. The size of the hydraulic force that the device bears realizes the rise and fall. The hydraulic automatic wax removal device does not need external power, and the scraper retracts when it goes down, the diameter is small, it is easy to lower, and the wax removal diameter is flexible and controllable. The hydraulic paraffin removal device needs to be put into the well at the well head of the rodless pump before working. After the paraffin removal operation is completed, it needs to be recovered from the well. The oil well does not shut down during the whole process of paraffin removal-wax removal-recovery. to achieve the above functions.

Invention content:

In order to solve the technical problems mentioned in the background technology, the present invention provides a rodless pump hydraulic wax remover wellhead release and recovery device, which has a simple structure and ingenious design, and can realize the release and recovery of the hydraulic wax remover process.

The technical solution of the present invention is: this kind of rodless pump hydraulic wax remover wellhead release and recovery device includes a telescopic hydraulic cylinder, a primary retractable cylinder and a secondary retractable cylinder. Its unique features are:

The telescopic hydraulic cylinder is a double-acting secondary telescopic oil cylinder, the oil inlet and outlet are in the cylinder 1, the telescopic hydraulic cylinder has a primary piston rod and a secondary piston rod, the cylinder is a flanged cylinder, and is one piece.

The upper end of the primary retractable cylinder is connected to the flange of the primary retractable cylinder by welding; the lower end of the primary retractable cylinder is connected to the upper flange by welding; the upper end of the secondary retractable cylinder is welded The lower end of the secondary retractable cylinder is connected to the wellhead flange by welding; between the flange of the hydraulic cylinder flange and the flange of the primary retractable cylinder, the first non-metallic Gasket, locked by fastening bolts and nuts.

On the flange of the lower flange, there are at least 4 through holes with internal threads in the radial direction, the through holes are evenly distributed on the flange, and the confluence point of the centerlines of the through holes is located on the lower flange on the center line of the flange plate; the through hole is sequentially provided with steel balls, compression springs, sealing rings and side bolts from the inside to the outside, and the side bolts are connected to the through hole through threads; the top of the side bolts and the compression spring contact, so as to realize the compression of the compression spring; the inner curved surface of the through hole is arc-shaped, so that the part of the steel ball extending out of the through hole is less than 1/2.

The device also includes a slide tube and a slip ring; the slide tube is provided with an upper track and a lower track sunken inward; the upper track is composed of three inverted sawtooths with the same tip angle connected by a circular arc transition, and the three The arc is located at the three stagnation points above, and the angle between the first guide surface and the second guide surface forming the tip of the inverted sawtooth is less than 60 degrees; the lower track is composed of three teeth with the same tip angle. The positive saw teeth are formed by connecting the first vertical groove, the second vertical groove and the third vertical groove in sequence, wherein the second vertical groove and the third vertical groove have the same depth, and the first vertical groove is longer than the other two vertical grooves. The depth of a vertical groove; the angle angle between the third guide surface and the fourth guide surface that constitutes the tip of the positive sawtooth is equal to 60 degrees, and each inverted sawtooth of the upper track corresponds to the lower track in the axial direction a vertical slot, but the axial section of the slide tube passing through the tip of the inverted sawtooth does not coincide with the axial section of the slide tube passing through the centerline of the vertical slot; the plane of the upper track and the lower track on the slide tube is expanded The figure is a closed figure; the slip ring is fixed in the inner cylinder of the upper flange, and there is a pin hole for the track pin to be inserted in the slip ring; the slip ring is set on the outer wall of the slide tube, and the track pin passes through the slip ring and is placed in the slide tube within the track.

The present invention has the following beneficial effects: the release and recovery device mainly includes a telescopic hydraulic cylinder and a wax remover recovery unit, the telescopic hydraulic cylinder is a double-acting two-stage telescopic oil cylinder, the oil inlet and outlet are in the cylinder barrel, through the downhole liquid pressure and three The position four-way valve controls the extension and retraction of the piston rod of the hydraulic cylinder, and the recovery unit of the wax remover mainly includes a slide pipe slip ring structure and a spring pin structure. The outer wall of the slide tube is provided with a track, which is connected with the slip ring through a track pin. Relying on the relative movement of the track pin and the sliding pipe, the control and recovery of the three-stage wax removal of the wax remover can be realized. The spring pin structure is composed of steel balls, springs, sealing rings and bolts, etc., installed in the flange, a total of four, evenly distributed in the flange. The inner side of the through hole in the flange is designed to be arc-shaped to ensure that the leakage of the steel ball is less than 1/2. When the hydraulic cylinder pushes the wax remover down, the steel ball retracts, the spring is compressed, and the wax remover moves downward smoothly. After the wax removal of the wax remover for the third time is completed, the wax remover is stuck on the spring pin, thereby completing the recovery work of the wax remover.

Firstly, this kind of recovery device uses telescopic hydraulic cylinders to push the hydraulic wax remover down, which can effectively reduce the stroke, save space, and effectively use the pressure of the downhole liquid; secondly, the slide pipe slip ring and spring in this kind of recovery device The design of the pin utilizes the characteristics of the hydraulic wax remover to realize the automatic recovery of the wax remover; thirdly, this recovery device can realize the release and recovery of the wax remover without turning off the pump, which improves the work efficiency. Efficiency, greatly reducing work intensity and production costs.

Description of drawings:

Fig. 1 is a longitudinal sectional structural diagram of a hydraulic wax remover throwing recovery device;

Fig. 2 is a three-dimensional view of the appearance of the present invention;

Fig. 3 is a planar development view of the sliding pipe track of the present invention;

Fig. 4 is a schematic diagram of the structure of the slide tube slip ring of the present invention;

Fig. 5 is a structural schematic diagram of the retractable mechanism of the present invention.

1-cylinder; 2-level piston rod; 3-level 2 piston rod; 4-fastening bolt; 5-hydraulic cylinder flange; 6-first non-metallic gasket; 7-level retractable barrel flange; 8-gasket; 9-nut; 10-first-level retractable cylinder; 11-sliding tube; 12-upper flange; 13-second non-metallic gasket 14-lower flange; 15-secondary retractable cylinder; 16-wellhead flange; 17-sealing ring; 18-side bolt; 19-compression spring; 20-steel ball; 21-slip ring; 22-track pin, 23-third guide surface, 24-fourth guide surface, 25 first guide surface, 26-second guide surface.

Detailed ways:

The present invention will be further described below in conjunction with accompanying drawing:

As shown in Figures 1 to 5, this type of rodless pump hydraulic wax remover wellhead release recovery device includes a telescopic hydraulic cylinder, a primary retractable cylinder 10 and a secondary retractable cylinder 15, and its unique features are:

The telescopic hydraulic cylinder is a double-acting secondary telescopic oil cylinder, the oil inlet and outlet are in the cylinder 1, the telescopic hydraulic cylinder has a primary piston rod 2 and a secondary piston rod 3, and the cylinder is a flanged cylinder. And all in one.

The upper end of the primary retractable tube 10 is connected to the flange 7 of the primary retractable tube by welding; the lower end of the primary retractable tube 10 is connected to the upper flange 12 by welding; the secondary retractable tube 15 The upper end of the hydraulic cylinder flange is connected to the lower flange 14 by welding, and the lower end of the secondary retractable barrel 15 is connected to the wellhead flange 16 by welding; the flange of the hydraulic cylinder flange is connected to the flange of the primary retractable barrel 7, place the first non-metallic gasket 6, and lock it by fastening the bolt 4 and the nut 9.

On the flange plate of the lower flange 14, there are at least 4 through holes with internal threads in the radial direction, and the through holes are evenly distributed on the flange plate, and the confluence point of the centerlines of the through holes is located in the lower flange. The center line of the flange of the flange 14; the through hole is sequentially provided with a steel ball 20, a compression spring 19, a sealing ring 17 and a side bolt 18, and the side bolt 18 is threadedly connected to the through hole; The top of the side bolt 18 is in contact with the compression spring 19, so as to realize the compression of the compression spring 19; the inner curved surface of the through hole is arc-shaped, so that the part of the steel ball 20 protruding from the through hole is less than half one.

The device also includes a slide tube 11 and a slip ring 21; the slide tube 11 is provided with an inwardly recessed upper track and a lower track; the upper track is composed of three inverted sawtooths with the same tip angle connected through a circular arc transition, so that The three circular arcs are located at the three stagnation points above, and the included angle between the first guide surface 25 and the second guide surface 26 forming the tip of the inverted sawtooth is less than 60 degrees; the lower track is composed of three The positive saw teeth with the same tooth tip angle are sequentially connected by the first vertical groove a, the second vertical groove b and the third vertical groove c, wherein the depth of the second vertical groove b and the third vertical groove c Same, the first vertical groove is longer than the depth of the other two vertical grooves; the included angle between the third guide surface 23 and the fourth guide surface 24 constituting the positive sawtooth tip is equal to 60 degrees, and each of the upper rails A vertical slot corresponding to the lower track in the axial direction, but the axial section of the slide tube passing through the tip of the inverted serration does not coincide with the axial section of the slide tube passing through the center line of the vertical slot; The above-mentioned upper track and the lower track on the slide tube 11 are closed figures; the slip ring 21 is fixed in the inner cylinder of the upper flange 12, and the slip ring 21 has a pin hole for the track pin 22 to be inserted into; the slip ring 21 Sleeved on the outer wall of the sliding tube 11 , the track pin 22 passes through the slip ring 21 and is placed in the track of the sliding tube 11 .

In a nutshell, this kind of wax remover feeding and recovery device is generally composed of upper and lower parts. The upper part is a telescopic hydraulic cylinder. . The downhole fluid pressure is used to push the piston rod down, and the hydraulic cylinder is connected to the wax remover recovery device below through the flange. The lower part is the recovery unit of the wax remover, which is mainly composed of retractable cylinder, slide pipe, slip ring, spring pin and so on. The track pin 22 passes through the slip ring 21 and is placed at the position a of the track a of the slide tube 11, as shown in FIG. 3 is a schematic structural diagram of the slide tube slip ring. Since the slide tube unfolds into two tracks with different lengths, under the action of the hydraulic wax remover, the slide tube can move up and down, and the slip ring is fixed by the lower flange 14 and the first-stage retractable barrel 10, and the first-stage retractable The release cylinder is connected to the upper flange 12 through welding, the upper flange is connected to the lower flange through bolts, the lower flange is connected to the secondary retractable cylinder 15 through welding, and the secondary retractable cylinder is welded. The connection mode links to each other with wellhead flange 16. The wellhead flange is connected with the upper flange of the Christmas tree wax removal valve through bolts. The spring pin structure is composed of lower flange, steel ball, compression spring, sealing ring, and side bolts. Steel ball 20, compression spring 19, sealing ring 17, and side bolts 18 are installed in the lower flange 14 in sequence. The orchids are connected by threads. The spring pin is used to hold the wax remover initially and after the third removal of the wax remover.

The working process of the hydraulic wax remover feeding and recovery device is as follows: first hang the hydraulic wax remover on the spring pin, hang the hydraulic wax remover by the protruding steel ball, and the slide pipe is placed on the top of the wax remover, then When the track pin is at the long track a position of the slide tube, there is a corresponding track on the outer wall of the slide tube, as shown in Fig. Long track, where the length of the track is determined by the head of the hydraulic wax remover. The top is three stagnant point positions, the included angle between the first guide surface 25 and the second guide surface 26 is 52° during specific implementation, and the included angle between the third guide surface 23 and the fourth guide surface 24 is 60° . According to the designed track size, it is just possible to control the rising distance of the wax remover each time, so as to achieve the effect of three-stage wax removal. The track pin between the slip ring and the slide tube runs along the track. The slip ring does not move, and the slide tube moves up and down. The telescopic hydraulic cylinder pushes the hydraulic wax remover downward, the steel ball retracts, the spring is compressed, and the hydraulic wax remover moves downward. At this time, the slide pipe follows the wax remover downward under the action of its own weight, and the track pin slides in through the long track. Position d, at this time, because the slide pipe is hung by the track pin, the slide pipe no longer follows the wax remover downward, the hydraulic wax remover enters the well for wax removal work, and the telescopic hydraulic cylinder retracts. When the first stage of wax removal is finished, the wax remover will automatically go up under the action of the oil in the oil well string, and push it up after touching the sliding pipe. At this time, the track pin slides from position d along the third guide surface 23 to the short track At position b, due to the structural characteristics of the wax remover itself, the wax remover continues to move downward to perform the secondary wax removal work. When the three-stage wax removal work is completed, during the upward process, the track pin slides back to position a along the track, and the hydraulic wax remover can rise to a higher height, surpassing the spring pin, and is caught by the spring pin again, completing the hydraulic clearing. Wax recovery.

Claims (1)

1. The utility model provides a recovery unit is put in to rodless pump hydraulic paraffin cleaner well head, and the upper portion is flexible pneumatic cylinder, and the lower part is paraffin cleaner recovery unit, its characterized in that:

the telescopic hydraulic cylinder is a double-acting secondary telescopic cylinder, the oil inlet and the oil outlet are arranged in a cylinder barrel, the telescopic hydraulic cylinder is provided with a primary piston rod and a secondary piston rod, and the cylinder barrel is a flange type cylinder barrel and is integrated; the telescopic hydraulic cylinder controls the extension and retraction of a hydraulic cylinder piston rod through underground liquid pressure and a three-position four-way valve, so that the hydraulic paraffin remover is pushed to descend, and the hydraulic paraffin remover passes through a spring pin and smoothly passes through a wellhead valve;

the telescopic hydraulic cylinder is connected with the lower paraffin cleaner recovery unit through a flange cylinder barrel;

the paraffin cleaner recovery unit comprises a winding and unwinding cylinder, a sliding tube, a sliding ring and a spring pin; the retractable cylinder comprises a first-stage retractable cylinder and a second-stage retractable cylinder;

the upper end of the first-stage retractable cylinder is connected with a flange of the first-stage retractable cylinder in a welding mode; the lower end of the first-stage retractable cylinder is connected with the upper flange in a welding mode; the upper end of the secondary winding and unwinding cylinder is connected with the lower flange in a welding mode, and the lower end of the secondary winding and unwinding cylinder is connected with the wellhead flange in a welding mode; a first nonmetal gasket is placed between the flange plate of the hydraulic cylinder flange and the first-stage retractable cylinder flange and is locked by a fastening bolt and a nut;

the sliding tube unfolding structure is composed of two rails with different lengths, and the sliding tube can move up and down under the action of the hydraulic paraffin remover; the outer wall of the sliding tube is provided with a track which is connected with the sliding ring through a track pin;

the two rails with different lengths are respectively an upper rail and a lower rail which are inwards concave and are arranged on the slide tube; the upper track is formed by connecting three inverted saw teeth with the same tooth tip angle through arc transition, wherein the three arcs are three standing point positions positioned above the upper track, and the included angle between a first guide surface and a second guide surface of the inverted saw tooth tip is equal to 52 degrees; the lower track is formed by connecting three positive sawteeth with the same tooth tip angle through a first vertical groove, a second vertical groove and a third vertical groove in sequence, wherein the depths of the second vertical groove and the third vertical groove are the same, and the first vertical groove is longer than the depths of the other two vertical grooves; the included angle between the third guide surface and the fourth guide surface forming the positive sawtooth tooth tip is equal to 60 degrees, and each inverted sawtooth of the upper track axially corresponds to one vertical groove of the lower track, but the axial tangential plane of the sliding tube passing through the inverted sawtooth tooth tip is not overlapped with the axial tangential plane of the sliding tube passing through the central line of the vertical groove; the plane unfolding patterns of the upper rail and the lower rail on the slide tube are closed patterns;

the slip ring is fixed in the inner cylinder of the upper flange, and is provided with a pin hole for inserting a track pin; the sliding ring is sleeved on the outer wall of the sliding tube, the track pin penetrates through the sliding ring and is arranged in a track of the sliding tube, the track pin between the sliding ring and the sliding tube moves along the track, the sliding ring does not move, the sliding tube moves up and down, and the three-stage paraffin removal control and recovery of the paraffin remover are realized by means of the relative movement of the track pin and the sliding tube;

the spring pin consists of a lower flange, a steel ball, a compression spring, a sealing ring and side bolts, wherein at least 4 through holes with internal threads are formed in the radial direction on the flange of the lower flange, the through holes are uniformly distributed on the flange, and a junction point of the central line of the through holes is positioned on the central line of the flange of the lower flange; the steel ball, the compression spring, the sealing ring and the side bolt are sequentially arranged in the through hole from inside to outside, and the side bolt is connected with the through hole through threads; the top end of the side bolt is contacted with the compression spring so as to compress the compression spring; the inner side curved surface of the through hole is arc-shaped, so that the part of the steel ball extending out of the through hole is less than half of the part;

the spring pin is used for clamping the paraffin remover after the paraffin remover is used for removing paraffin for the first time and the third time, the steel ball is retracted when the hydraulic cylinder pushes the paraffin remover to move downwards, the compression spring is compressed, the paraffin remover moves downwards, and the paraffin remover is clamped on the spring pin after the paraffin remover is used for removing paraffin for the third time, so that recovery work of the paraffin remover is completed.

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