CN111927404A - Gravel packing tool capable of being used while being flushed - Google Patents
Gravel packing tool capable of being used while being flushed Download PDFInfo
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- CN111927404A CN111927404A CN202011099791.XA CN202011099791A CN111927404A CN 111927404 A CN111927404 A CN 111927404A CN 202011099791 A CN202011099791 A CN 202011099791A CN 111927404 A CN111927404 A CN 111927404A
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- pipe
- joint
- filling
- hanger
- sleeve
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/04—Gravelling of wells
Abstract
The invention discloses a gravel packing tool while flushing, which relates to the technical field of oil well sand prevention and comprises a hanger, a sand filtering pipe and a bottom well washer which are sequentially connected from top to bottom, wherein the hanger and the sand filtering pipe are connected together through a quick connector, a circulation channel for packing is formed by the hanger, the sand filtering pipe and an inner cavity of the bottom well washer, and a service pipe column is arranged in the circulation channel; the service pipe column comprises a central pipe located in a hanger cavity, the upper end of the central pipe is in threaded connection with an upper joint, a screw thread connected with the hanger is arranged on the outer wall of the central pipe, the lower end of the central pipe is connected with a flushing pipe through a flushing pipe joint, the lower end of the flushing pipe is connected with a sealing plug, and the sealing plug stretches into the bottom well washer through a sand filter pipe cavity. The invention has simple structure, flushing while discharging, high flushing speed, can effectively solve the problem of stratum sand blockage when a pipe column is put in, can avoid hollowing out a shaft pocket during filling construction, and has good construction effect.
Description
Technical Field
The invention relates to the technical field of sand prevention of oil wells, in particular to a tool for filling gravel while flushing.
Background
For a very loose cemented stratum, namely a commonly-known quicksand layer, when liquid flow fluctuates, the stratum can spit a large amount of sand, a perforating gun is often started during sand control operation, stratum sand is buried in a blast hole immediately, so that a subsequent sand control pipe column cannot be put in place, brine is only used for sand washing and killing a well for many times, and sometimes a well needs to be washed repeatedly for many times to put a pipe string in place.
The common sand washing and filling process is adopted, the sand prevention pipe string is put in place, the washing pipe string is taken out, and when the filling pipe string is put in, the screen pipe string is partially buried by formation sand, which affects the filling construction on one hand, and on the other hand, when the formation sand is mixed with the filling sand to form a mixed sand belt, the permeability of the filling layer is directly reduced, and the sand prevention effect is affected. Therefore, a filling tool for solving this problem is urgently needed.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a gravel filling tool capable of being used for flushing while lowering, which has a simple structure, is capable of flushing while lowering, is high in flushing speed, can effectively prevent formation sand from being blocked when a tubular column is lowered, can avoid hollowing a shaft pocket, and is good in construction effect.
The technical scheme of the invention is as follows: the gravel packing tool comprises a hanger, a sand filtering pipe and a bottom well washer which are sequentially connected from top to bottom, wherein the hanger and the sand filtering pipe are connected together through a quick connector, a circulation channel for packing is formed by the hanger, the sand filtering pipe and an inner cavity of the bottom well washer, and a service pipe column is arranged in the circulation channel;
the service pipe column comprises a central pipe positioned in a hanger cavity, the upper end of the central pipe is in threaded connection with an upper joint, the outer wall of the central pipe is provided with a screw thread connected with the hanger, the lower end of the central pipe is connected with a washpipe through a washpipe joint, the lower end of the washpipe is connected with a sealing plug, and the sealing plug extends into the bottom well washer through a sand filter pipe cavity;
the bottom well washer comprises a well washer joint connected with the lower end of a base pipe of the sand filter pipe, the well washer joint is connected with a short joint through a valve sleeve and a sealing connecting sleeve assembly, the lower end of the short joint is sequentially connected with a filling sleeve and a guide shoe, a filling hole communicated with an inner cavity is formed in the filling sleeve, the filling hole is arranged upwards and upwards relative to the surface of the filling sleeve, and a backwashing hole communicated with the inner cavity is formed in the lower end of the guide shoe; the anti-washing device is characterized in that a ball seat used for sealing the filling hole is arranged at the position, located at the filling hole, in the filling sleeve, the ball seat is connected with the filling sleeve through a pin, a ball blocking rod is arranged at an opening at the upper end of the ball seat, a steel ball used for sealing an outlet at the lower end of the ball seat is movably arranged between the ball blocking rod and an outlet at the lower end of the ball seat in the ball seat, and the anti-washing hole, the outlet at the lower end of the.
Preferably, the hanger establishes clamping ring, sheath, packing element, packing ring, packer and the lower clutch in proper order including from top to bottom in the center tube outside, clamping ring and sheath threaded connection, be equipped with the piston between top connection and the clamping ring, be equipped with the hole of suppressing that communicates with the piston up end on the center tube, the inboard of clamping ring has the deblocking cover through shearing pin joint, be equipped with the catch that can dismantle the connection with the center tube on the deblocking cover, be equipped with the screw thread that is connected with the neutral point of center tube on the catch, be equipped with the helmet on the lower clutch.
Preferably, the sand screen pipe comprises a base pipe, a base pipe coupling connected with the quick connector is arranged at the upper end of the base pipe, and the lower end of the base pipe is connected with the well washer joint.
Preferably, quick-operation joint includes regulating tube, loose joint pipe and connecting pipe, the one end of regulating tube is connected with the lower clutch of hanger, be equipped with spacing step on the lower extreme inner wall of loose joint pipe, the other end outside of regulating tube and loose joint pipe upper end threaded connection and with spacing step formation compensation space, be equipped with the compensation step on the outer wall of connecting pipe, the compensation step matches with spacing step and merges the activity setting in the compensation space, the connecting pipe surface contacts with regulating tube inner wall sliding seal, the connecting pipe lower extreme links together with the parent tube coupling.
Preferably, two sand blocking valves are arranged in a valve sleeve of the bottom well washing device, and one end of each sand blocking valve is rotatably connected with the valve sleeve through an elastic piece.
Preferably, the sealing connecting sleeve component comprises a sealing sleeve fixedly connected with the valve sleeve and a connecting sleeve connected with the lower end of the sealing sleeve, and the lower end of the connecting sleeve is connected with the upper end of the short circuit.
Preferably, the guide shoe is in threaded connection with the lower end of the filling sleeve, a conical filling cavity with the inner diameter gradually reduced from the opening to the inside is arranged on the inner wall of the connecting end of the guide shoe, and the conical filling cavity is communicated with the filling hole.
Preferably, the inner wall of the upper joint of the bottom well washing device is provided with a limiting boss for limiting the sealing plug.
Preferably, the connecting thread at the upper end of the central tube is threaded in the opposite direction to the thread at the midpoint.
Preferably, the packer comprises an upper cone, a slip and a lower cone which are sequentially arranged from top to bottom and sleeved outside the locking ring, wherein a slip cover is arranged on the outer side of the slip, and the lower cone is fixedly connected with a lower joint of the hanger.
Compared with the prior art, the invention has the following advantages:
1. the flushing hole can be arranged at the bottommost part of the pipe string through the service pipe column, is directly aligned to a sand surface and is flushed while the sand surface is flushed, the flushing speed is high, and the sewage in the area can be directly used for flushing sand; a washing and filling pipe column connecting mechanism is added; the steel ball is arranged in the well, and ball throwing or ball washing is not needed; the inner drift diameter is 90mm, and the sieve tube can be matched with a 4in precise composite sieve tube for use;
2. the filling channel is close to the upper part, and the filling hole is upward, so that the shaft pocket can be prevented from being hollowed, and the construction effect is good;
3. the valve sleeve can be closed through the two-stage sand blocking valve, so that the closing reliability is ensured;
4. the filling channel is large, and the filling device is suitable for large-discharge filling construction.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the hanger;
FIG. 3 is a schematic structural view of a sand screen;
FIG. 4 is a schematic diagram of a bottom hole washer;
FIG. 5 is a schematic view of the construction of the quick connector;
in the figure: 1. hanger, 2, sand filter pipe, 3, bottom flushing device, 4, quick connector, 5, sealing plug, 6, central pipe, 7, upper joint, 8, flushing pipe coupling, 9, flushing pipe, 10, protective cap, 11, press ring, 12, sheath, 13, rubber cylinder, 14, gasket, 15, lower joint, 16, piston, 17, punching hole, 18, shearing pin, 19, deblocking sleeve, 20, lock ring, 21, base pipe, 22, base pipe coupling, 23, flushing pipe joint, 31, flushing device joint, 32, valve sleeve, 33, short joint, 34, filling sleeve, 35, guide shoe, 36, filling hole, 37, backwashing hole, 38, ball seat, 39, ball blocking rod, 40, steel ball, 41, adjusting pipe, 42, activity, 43, connecting pipe, 44, limiting step, 45, compensation space, 46, compensation step, 47, sand blocking valve, 48, sealing sleeve, 49, connecting sleeve, 50, upper cone, 51. slips, 52, lower cone, 53, slip cover.
Detailed Description
The invention is further illustrated below with reference to the figures and examples.
Example one
Referring to fig. 1-5, the gravel packing tool with flushing and gravel discharging comprises a hanger 1, a sand screen 2 and a bottom well washer 3 which are sequentially connected from top to bottom, wherein the hanger 1 and the sand screen 2 are connected together through a quick connector 4, an inner cavity of the hanger 1, the sand screen 2 and the bottom well washer 3 forms a circulation channel for packing, and a service pipe column is arranged in the circulation channel.
Wherein, the service string is including being located the center tube 6 in 1 cavity of hanger, and the upper end threaded connection of center tube 6 has top connection 7, is equipped with the screw thread that is connected with hanger 1 on the outer wall of center tube 6, and the lower extreme of center tube 6 is connected with the flushing pipe 9 through back of the body cap, loose joint and flushing pipe joint 23, and flushing pipe 9 can be many, and flushing pipe 9 links together by flushing pipe coupling 8 with sealing plug 5, stretches into in bottom well washer 3 through 2 cavities of sand screen.
In addition, the bottom well washer 3 comprises a well washer joint 31 connected with the lower end of the base pipe 21 of the sand screen 2, the well washer joint 31 is connected with a short joint 33 through a valve sleeve 32 and a sealing connection sleeve assembly, the lower end of the short joint 33 is sequentially connected with a filling sleeve 34 and a guide shoe 35, a filling hole 36 communicated with an inner cavity is formed in the filling sleeve 34, the filling hole 36 is arranged in an upward inclined mode relative to the surface of the filling sleeve 34, the filling hole 36 is formed in the filling sleeve 34 and located above a filling channel, and the filling hole 36 is in the direction, so that impact on the well bottom is prevented during filling, the well hole pocket can be prevented from being hollowed, and the construction effect is good. The lower end of the guide shoe 35 is provided with a backwashing hole 37 communicated with the inner cavity, dirt at the flushing blockage part can enter the sealing plug 5 through the backwashing hole 37, and finally the dirt is circulated to the ground; a ball seat 38 used for sealing the filling hole 36 is arranged at the position of the filling hole 36 in the filling sleeve 34, the ball seat 38 and the filling sleeve 34 are connected together through a pin, a ball blocking rod 39 is arranged at the opening at the upper end of the ball seat 38, a steel ball 40 used for sealing the outlet at the lower end of the ball seat 38 is movably arranged between the ball blocking rod 39 and the outlet at the lower end of the ball seat 38 in the ball seat 38, the outlet at the lower end of the ball seat 38 and the flushing pipe 9 are on the same axis, and the functions of early backwashing, seat sealing and later filling can be realized through the ball seat 38 and the steel ball. When the pipe column meets a blockage, the functions of flushing while flushing are utilized, reverse flushing is carried out, liquid flow is pumped in from the casing valve, and is flushed to the position where the pipe column meets the blockage through the oil casing annulus, dirt such as stratum sand forming the blockage is gradually carried together to pass through the backwashing hole 37 at the lowest end of the pipe column, sequentially enter the sealing plug 5, the flushing pipe 9, the flushing pipe coupling 8, the central pipe 6 and the oil pipe, and finally, the circulation flushing is carried out to reach the ground. After the obstructions such as stratum sand and the like are washed clean, the construction pipe column can smoothly descend to reach the designed position.
Hanger 1 is including establishing in proper order from top to bottom the clamping ring 11 in the center tube 6 outside, sheath 12, packing element 13, packing ring 14, packer and lower clutch 15, clamping ring 11 and sheath 12 threaded connection, be equipped with piston 16 between top connection 7 and the clamping ring 11, be equipped with on the center tube 6 with the 16 up end of piston intercommunication beat the pressure hole 17, the inboard of clamping ring 11 is connected with through shearing pin 18 and separates the cover 19, it is equipped with the catch 20 of being connected to dismantle with center tube 6 on the cover 19 to separate, be equipped with the screw thread that is connected with the neutralization point department of center tube 6 on the catch 20, be equipped with helmet 10 on the lower clutch 15. After the pipe column is in place, positive pressing is carried out by using small displacement, the steel ball 40 is pushed by water power to seat on the ball seat 38 to realize sealing, each pressure stabilization time is 2min at 4-6-8-12-14 MPa, at the moment, the piston 16 descends, the pressing ring 11 is pushed to cut off the shearing pin 18, the locking ring 20, the sheath 12, the gasket 14 and the upper cone 50 of the packer are pushed to descend in sequence, the rubber expansion sealing oil sleeve annulus is completed by compressing the rubber sleeve 13, the slip 51 of the packer is propped out, and the seat hanging is completed; and lifting the pipe column, increasing the load by 3-5 tons and confirming that the packer is reliably set and hung.
The sand screen 2 comprises a base pipe 21, the upper end of the base pipe 21 is provided with a base pipe coupling 22 connected with the quick connector 4, and the lower end of the base pipe 21 is connected with a well washer joint 31. The sand filtering pipe 2 is a sand control pipe string consisting of an YFS precise composite screen pipe or an YSS punching and winding double-stage screen pipe.
Example two
As a preferred embodiment, the same as the first embodiment, except that the quick connector 4 includes an adjusting pipe 41, a union pipe 42 and a connecting pipe 43, one end of the adjusting pipe 41 is connected with the lower joint 15 of the hanger 1, a limit step 44 is provided on an inner wall of a lower end of the union pipe 42, an outer side of the other end of the adjusting pipe 41 is in threaded connection with an upper end of the union pipe 42 and forms a compensation space 45 with the limit step 44, a compensation step 46 is provided on an outer wall of the connecting pipe 43, the compensation step 46 is matched with the limit step 44 and movably provided in the compensation space 45, an outer surface of the connecting pipe 43 is in sliding sealing contact with an inner wall of the adjusting pipe 41, and a lower end of the connecting pipe 43 is connected with the. When hanger 1 is connected with sand screen 2, through the upper end of adjusting pipe 41 and the lower clutch 15 threaded connection of hanger 1, and connecting pipe 43 links together with the parent tube coupling 22 of sand screen 2, can adjust the length of quick-operation joint ware 4 according to the length of service string through compensation space 45 like this, the quick-operation joint of being convenient for.
EXAMPLE III
As a preferred embodiment, it is basically the same as the first embodiment except that two sand stop valves 47 are provided in the valve housing 32 of the bottom washer 3, and one end of each sand stop valve 47 is rotatably connected to the valve housing 32 by an elastic member. The valve sleeve 32 is closed through the double-stage sand blocking valve 47, so that the safety and reliability of closing are ensured.
In addition, the sealing connecting sleeve assembly comprises a sealing sleeve 48 fixedly connected with the valve sleeve 32 and a connecting sleeve 49 connected with the lower end of the sealing sleeve 48, and the lower end of the connecting sleeve 49 is connected with the upper end of the short joint 33.
The guide shoe 35 is in threaded connection with the lower end of the filling sleeve 34, a conical filling cavity with the inner diameter gradually reduced from the opening to the inside is arranged on the inner wall of the connecting end of the guide shoe 35, and the conical filling cavity is communicated with the filling hole 36. The opening of the whole filling hole 36 can be increased through the conical filling cavity structure, the direction of the filling hole 36 is upward, the shaft pocket can be effectively prevented from being hollowed, and the construction effect is guaranteed.
And a limiting boss for limiting the sealing joint 5 is arranged on the inner wall of the flushing device joint 31 of the bottom flushing device 3. The lower entering position of the sealing joint 5 can be limited through the limiting boss, so that the lower end opening of the sealing joint is positioned at the connecting position of the short joint 33 and the guide shoe 35.
The connecting thread at the upper end of the central tube 6 is screwed in the opposite direction to the thread at the middle point. Thus, when the top sub 7 is rotated, the top sub 7 becomes more and more threaded with the upper end of the center tube 6, and the midpoint threaded may be separated by rotation, thereby separating the service string from the hanger 1.
The packer comprises an upper cone 50, a slip 51 and a lower cone 52 which are sleeved outside the locking ring 20 and are sequentially arranged from top to bottom, wherein a slip cover 53 is arranged outside the slip 51, and the lower cone 52 is fixedly connected with the lower joint 15 of the hanger 1. Slips 51 are extended out of the slip cap 53 by the downward pressure of the upper cone 50 to achieve a secure seat with the casing.
Before the pipe string is put into the pipe string, the hanger 1 is connected with the sand screen 2 through the quick connector 4, namely the upper end of the adjusting pipe 41 is in threaded connection with the lower joint 15 of the hanger 1, and the connecting pipe 43 is connected with a base pipe coupling 22 of the sand screen 2; then the flushing pipe 9 is connected with the central pipe 6 through the flushing pipe joint 23 and the flushing pipe coupling 8, the lower end of the flushing pipe 9 is connected with the sealing joint 5 through the flushing pipe coupling 8, and the sealing joint 5 is limited through the limiting boss to be located at a proper position, so that service pipe column connection can be completed; and finally, connecting the upper joint 7 with the oil pipe until reaching a wellhead, and finally sending the connected pipe column into the well.
When the pipe column meets a blockage, the functions of flushing while flushing are utilized, reverse flushing is carried out, liquid flow is pumped in from the casing valve, and is flushed to the position where the pipe column meets the blockage through the oil casing annulus, dirt such as stratum sand forming the blockage is gradually carried together to pass through the backwashing hole 37 at the lowest end of the pipe column, sequentially enter the sealing joint 5, the flushing pipe 9, the flushing pipe coupling 8, the central pipe 6 and the oil pipe, and finally, the circulation flushing is carried out to reach the ground. After the obstructions such as stratum sand and the like are washed clean, the construction pipe column can smoothly descend to reach the designed position.
After the pipe column is in place, the pipe column is positively pressed by small displacement, the steel ball 40 is pushed by water power to be seated on the ball seat 38, so that the backwashing hole 37 and the filling hole 36 at the bottom are sealed, then the pressure is stabilized for 2min at 4-6-8-12-14 MPa, at the moment, the piston 16 descends, the pressure ring 11 is pushed to cut off the shearing pin 18, the locking ring 20, the sheath 12, the gasket 14 and the upper cone 50 in the FIG. 2 are pushed to descend in sequence, the rubber cylinder 13 completes rubber expansion to seal the oil sleeve annulus, the slip 51 is propped out, and seating and hanging are completed; and lifting the pipe column, increasing the load by 3-5 tons and confirming that the packer is reliably set and hung.
The oil pipe is continuously positively pressurized to 16-20 MPa, the sealing ball seat 38 cuts off the pin, the ball seat 38 descends, the pressure drops to 0 suddenly, and the filling hole 36 is exposed; lifting the service string to a neutral point (as indicated in fig. 2, which is a threaded connection point of the service string and the well-remaining string), rotating the tubing forward more than fifteen turns to disconnect the service string;
filling operation is carried out according to construction requirements, gravel is filled through a filling channel through a filling hole 36, when the designed sand amount is added or the pressure suddenly rises to reach a pressure limiting value (30 MPa), oil pipe mortar is replaced, a casing pipe gate is slowly opened for pressure relief, a pipe column is lifted for 1-2m, the well is washed in a reverse circulation mode for more than one week, and the outlet is washed clean and free of sand; and (5) taking out the service pipe column, and finishing construction.
The invention has the following advantages: 1. the method is suitable for filling construction of highly deviated wells and horizontal wells, and is especially suitable for oil wells with high permeability on the upper part and not suitable for top filling for multi-layer sand control; 2. the matched tool is simple and convenient, the implementation process is simple, and the method is safe and reliable and can adapt to large-displacement filling construction; 3. the drift diameter of the tool is large, so that later-stage operation is facilitated; 4. the pipe column realizes the simultaneous flushing, simultaneous discharging and gravel packing, thereby not only saving the operation cost, but also ensuring the sand prevention construction effect; 5. the method is particularly suitable for the well type of open hole sand control completion, mud can be circulated at any time in the process of going down the well, the construction safety is greatly improved, and the integrated operation of replacing the mud and filling after going into place ensures the sand control effect; 6. the flushing hole is arranged at the bottommost part and can directly touch the sand surface, the requirement on flushing liquid is low, the flushing speed is high, and the effect is good; 7. the outlet of the filling channel is close to the upper part, and the filling hole 36 is upward, so that the pocket is prevented from being hollowed, the construction effect is prevented from being influenced, and the sleeve is protected to a certain extent; 8. the valve sleeve 32 can be closed through the double-stage sand blocking valve 47, and the multi-closing system ensures safe and reliable closing; it is suitable for sand control of various oil wells.
The present invention is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention, and the contents of the changes still fall within the scope of the present invention.
Claims (10)
1. Gravel packing instrument under limit is washed including hanger, sand screen and the bottom well washer that from top to bottom connects gradually, its characterized in that:
the hanger and the sand filter pipe are connected together through a quick connector, the hanger, the sand filter pipe and an inner cavity of the bottom well washer form a circulating channel for filling, and a service pipe column is arranged in the circulating channel;
the service pipe column comprises a central pipe positioned in a hanger cavity, the upper end of the central pipe is in threaded connection with an upper joint, the outer wall of the central pipe is provided with a screw thread connected with the hanger, the lower end of the central pipe is connected with a washpipe through a washpipe joint, the lower end of the washpipe is connected with a sealing plug, and the sealing plug extends into the bottom well washer through a sand filter pipe cavity;
the bottom well washer comprises a well washer joint connected with the lower end of a base pipe of the sand filter pipe, the well washer joint is connected with a short joint through a valve sleeve and a sealing connecting sleeve assembly, the lower end of the short joint is sequentially connected with a filling sleeve and a guide shoe, a filling hole communicated with an inner cavity is formed in the filling sleeve, the filling hole is arranged upwards and upwards relative to the surface of the filling sleeve, and a backwashing hole communicated with the inner cavity is formed in the lower end of the guide shoe; the anti-washing device is characterized in that a ball seat used for sealing the filling hole is arranged at the position, located at the filling hole, in the filling sleeve, the ball seat is connected with the filling sleeve through a pin, a ball blocking rod is arranged at an opening at the upper end of the ball seat, a steel ball used for sealing an outlet at the lower end of the ball seat is movably arranged between the ball blocking rod and an outlet at the lower end of the ball seat in the ball seat, and the anti-washing hole, the outlet at the lower end of the.
2. The washdown gravel packing tool of claim 1, wherein: the hanger is including establishing clamping ring, sheath, packing element, packing ring, packer and the lower clutch in the center tube outside from top to bottom in proper order, clamping ring and sheath threaded connection, be equipped with the piston between top connection and the clamping ring, be equipped with on the center tube with the hole of suppressing of piston up end intercommunication, the inboard of clamping ring has the deblocking cover through shearing pin joint, be equipped with on the deblocking cover and can dismantle the catch of being connected with the center tube, be equipped with the screw thread that is connected with the neutral point of center tube on the catch, be equipped with the helmet on the lower clutch.
3. The washdown gravel packing tool of claim 2, wherein: the sand screen pipe comprises a base pipe, a base pipe coupling connected with a quick connector is arranged at the upper end of the base pipe, and the lower end of the base pipe is connected with a well washer joint.
4. The downhole gravel pack of claim 3, wherein: quick-operation joint includes regulating tube, loose joint pipe and connecting pipe, the one end of regulating tube is connected with the lower clutch of hanger, be equipped with spacing step on the lower extreme inner wall of loose joint pipe, the other end outside of regulating tube and loose joint pipe upper end threaded connection and with spacing step formation compensation space, be equipped with the compensation step on the outer wall of connecting pipe, the compensation step matches with spacing step and merges the activity setting in the compensation space, connecting pipe surface and regulating tube inner wall sliding seal contact, the connecting pipe lower extreme links together with the parent tube coupling.
5. The washdown gravel packing tool of claim 1, wherein: and two sand blocking valves are arranged in a valve sleeve of the bottom well washing device, and one end of each sand blocking valve is rotatably connected with the valve sleeve through an elastic piece.
6. The washdown gravel packing tool of claim 1, wherein: the sealing connecting sleeve assembly comprises a sealing sleeve fixedly connected with the valve sleeve and a connecting sleeve connected with the lower end of the sealing sleeve, and the lower end of the connecting sleeve is connected with the upper end of the short circuit.
7. The washdown gravel packing tool of claim 1, wherein: the guide shoe is in threaded connection with the lower end of the filling sleeve, a conical filling cavity with the inner diameter gradually reduced from the opening to the inside is arranged on the inner wall of the connecting end of the guide shoe, and the conical filling cavity is communicated with the filling hole.
8. The washdown gravel packing tool of claim 1, wherein: and a limiting boss used for limiting the sealing plug is arranged on the inner wall of the upper joint of the bottom well washing device.
9. The washdown gravel packing tool of claim 1, wherein: the connecting thread at the upper end of the central tube is opposite to the thread direction of the middle point part.
10. The washdown gravel packing tool of claim 1, wherein: the packer comprises an upper cone, a slip and a lower cone which are sequentially arranged outside the locking ring from top to bottom, wherein a slip cover is arranged on the outer side of the slip, and the lower cone is fixedly connected with a lower joint of the hanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011099791.XA CN111927404B (en) | 2020-10-15 | 2020-10-15 | Gravel packing tool capable of being used while being flushed |
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| CN202011099791.XA CN111927404B (en) | 2020-10-15 | 2020-10-15 | Gravel packing tool capable of being used while being flushed |
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| CN111927404B CN111927404B (en) | 2020-12-18 |
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