CN110500065B - Screen pipe structure capable of being floated and lowered into oil-gas well - Google Patents
Screen pipe structure capable of being floated and lowered into oil-gas well Download PDFInfo
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- CN110500065B CN110500065B CN201910894385.3A CN201910894385A CN110500065B CN 110500065 B CN110500065 B CN 110500065B CN 201910894385 A CN201910894385 A CN 201910894385A CN 110500065 B CN110500065 B CN 110500065B
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- 238000007789 sealing Methods 0.000 claims abstract description 76
- 238000007667 floating Methods 0.000 claims abstract description 43
- 238000005553 drilling Methods 0.000 claims abstract description 24
- 239000012530 fluid Substances 0.000 claims abstract description 24
- 239000004576 sand Substances 0.000 claims abstract description 17
- 238000010276 construction Methods 0.000 claims abstract description 11
- 230000002265 prevention Effects 0.000 claims abstract description 9
- 238000006073 displacement reaction Methods 0.000 claims abstract description 7
- 210000000078 claw Anatomy 0.000 claims description 25
- 210000002445 nipple Anatomy 0.000 claims description 17
- 230000007704 transition Effects 0.000 claims description 13
- 238000003825 pressing Methods 0.000 claims description 8
- 238000010008 shearing Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 230000005489 elastic deformation Effects 0.000 claims description 2
- 125000006850 spacer group Chemical group 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 7
- 230000009977 dual effect Effects 0.000 abstract description 4
- 230000005484 gravity Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 4
- 239000002131 composite material Substances 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000002955 isolation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005341 toughened glass Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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
- E21B43/08—Screens or liners
- E21B43/086—Screens with preformed openings, e.g. slotted liners
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to a screen pipe structure capable of being floated and put in an oil-gas well, which comprises a floating screen pipe, wherein the bottom end of the floating screen pipe comprises a first base pipe, a guiding sealing head is arranged at the bottom end of the first base pipe, the circumferential outer wall at the top end of the first base pipe is connected with the bottom end of a second base pipe, the top end of the second base pipe is connected with an upper joint, the pipe wall of the second base pipe is provided with a flow guiding part, the inner side and the outer side of the second base pipe are communicated by the flow guiding part, and a sand prevention screen pipe is arranged outside the first base pipe. The floating sieve tube adopts a double-layer composite technology, the pressure-bearing short section is utilized to connect the floating sieve tube with the upper section sleeve, during the well completion construction process of the horizontal well sieve tube, the pressure-bearing short section is utilized to block drilling fluid on one side of the upper section sleeve, so that the floating sieve tube is kept in a liquid-free state, and the pipe column is lowered to the bottom of the well by utilizing the dual functions of the gravity of the upper section sleeve of the pressure-bearing short section and the drilling fluid and the buoyancy of the floating sieve tube section, thereby solving the problem of difficult lower-pipe-in of the large-displacement horizontal well sieve tube.
Description
Technical Field
The invention relates to a screen pipe structure capable of being floated and lowered into an oil-gas well.
Background
At present, in the sand prevention completion process of a large displacement well or a horizontal well screen pipe with larger water sag, if the screen pipe is used for completion, the problems of difficult pipe string running and even sticking are caused, and the pipe string cannot be smoothly run into a designed position; if the current industry accepted floating casing running technology is used, perforation completion is needed after casing running is completed, but sand prevention effect cannot be achieved, and later oil and gas exploitation is seriously affected.
Disclosure of Invention
The invention provides a screen pipe structure capable of floating in an oil-gas well, which has reasonable structural design, the floating screen pipe adopts a double-layer composite technology, namely, the outer side is a sand-proof screen pipe, the inner side is a high-strength base pipe, the pressure-bearing nipple is used for connecting the floating screen pipe with an upper section sleeve, during the well completion construction process of the screen pipe of a horizontal well, drilling fluid is blocked at one side of the upper section sleeve by the pressure-bearing nipple, so that the floating screen pipe is kept in a liquid-free state, the pipe column is put in the bottom of the well by the dual functions of the gravity of the upper section sleeve of the pressure-bearing nipple and the drilling fluid and the buoyancy of the floating screen pipe section, the floating in technology of the horizontal section screen pipe is adopted, the problem of difficult in-pipe in of the large-displacement horizontal well screen pipe is solved, after the pipe column is put in the designed depth, the diversion part of the floating screen pipe is opened by a special tool for subsequent production or construction operation, and the use operation is convenient and reliable, and the problem in the prior art is solved.
The technical scheme adopted by the invention for solving the technical problems is as follows: a floatable screen structure for an oil and gas well comprising:
the floating screen comprises a first base pipe, a guiding sealing head is arranged at the bottom end of the first base pipe, the circumferential outer wall of the top end of the first base pipe is connected with the bottom end of a second base pipe, the top end of the second base pipe is connected with an upper joint, a flow guiding part is arranged on the pipe wall of the second base pipe, the inner side and the outer side of the second base pipe are communicated through the flow guiding part, a sand prevention screen is arranged outside the first base pipe, the top end of the sand prevention screen is connected with the circumferential outer wall of the second base pipe, and the distance between the connecting position of the sand prevention screen and the second base pipe and the upper joint is smaller than the distance between the flow guiding part and the upper joint; the circumference inner wall of the second base pipe is provided with a sealing pipe, and the sealing pipe is provided with a first state for sealing the flow guiding part and a second state for opening the flow guiding part;
the pressure-bearing nipple is connected with the upper joint, and the inner wall of the pressure-bearing nipple is provided with a pressure-bearing plate;
the upper section of casing is connected with the pressure-bearing short section and is suitable for conveying drilling fluid;
the bearing plate has rated bearing value, and when the pressure of the drilling fluid born by the bearing plate is smaller than the rated pressure value, the bearing plate can limit the drilling fluid to enter the floating screen pipe.
Further, the sealing tube is connected with the inner wall of the second base tube through the shearing pin, an upper sealing ring and a lower sealing ring which are connected with the inner wall of the second base tube are arranged on the outer wall of the circumference of the lower section of the sealing tube along the axial direction of the outer wall of the circumference of the lower section of the sealing tube, and the upper sealing ring and the lower sealing ring are respectively arranged on the two radial sides of the flow guiding part, so that the sealing tube forms a first state for sealing the flow guiding part.
Further, the top of sealed tube is equipped with the elastic claw, the circumference outer wall of elastic claw is equipped with the jump ring, the bottom circumference inner wall of top connection be equipped with can with jump ring matched with draw-in groove, the inner wall of elastic claw is equipped with the recess, the recess can cooperate with professional equipment, can make after professional equipment and the recess cooperation shear pin cut off, makes the sealed tube follow the axial displacement of second base tube, makes the jump ring of elastic claw with the draw-in groove of top connection cooperatees, in order to fix the position of sealed tube makes the sealed tube be in the second state of opening the water conservancy diversion portion.
Further, a plurality of isolation supporting rings are axially arranged between the sand control screen pipe and the first base pipe, and the bottom end of the sand control screen pipe is connected with the guide sealing head.
Furthermore, the flow guiding part is set as a flow guiding port, and a plurality of flow guiding ports are uniformly arranged along the circumferential pipe wall of the second base pipe.
Further, the anti-falling structure comprises a limiting part arranged on the outer wall of the sealing tube, when the sealing tube is in a first state, a transition groove matched with the limiting part is formed in the inner wall of the second base tube, and a non-return groove is formed in the inner wall of the second base tube; when the sealing tube is in the second state, the limiting part of the sealing tube and the check groove are matched with each other so as to limit the sealing tube to move along the axial direction.
Further, the limiting parts are provided with chamfers along the two axial ends of the sealing tube, the notch of the transition groove is provided with a chamfer structure matched with the limiting parts, and the notch position of the check groove close to one side of the transition groove is set to be a right-angle structure.
Further, a flow-assisting groove is formed in the position, corresponding to the flow guiding portion, of the inner wall of the second base pipe, and when the drilling fluid flows outwards from the flow guiding portion, the flow-assisting groove can reduce the drilling fluid pressure born by the flow guiding portion.
Further, the special equipment comprises
A drill pipe joint adapted to be connected to a drill pipe;
the central pipe is connected with the drill pipe joint;
the spring housing, the spring housing sets up the circumference outside of center tube, the circumference outer wall of spring housing is equipped with the jack catch with the recess matched with of elastic claw, the jack catch of spring housing with have the clearance between the center tube, make the jack catch of spring housing can take place elastic deformation along the radial of center tube.
Further, an upper baffle ring is arranged outside the central tube, the top end of the spring sleeve is connected with the upper baffle ring, the bottom end of the spring sleeve is connected with a lower pressing ring, and the lower pressing ring is connected with the central tube; the bottom of the spring sleeve is mutually buckled and connected with the lower pressing ring.
The floating screen pipe has the beneficial effects that the structure is reasonable in structural design, the outer side is the sand-proof screen pipe, the inner side is the high-strength base pipe, the pressure-bearing nipple is used for connecting the floating screen pipe with the upper section sleeve, during the well completion construction process of the horizontal well screen pipe, drilling fluid is blocked at one side of the upper section sleeve by the pressure-bearing nipple, so that the floating screen pipe is kept in a liquid-free state, the pipe column is lowered to the bottom of the well by the dual action of the gravity of the upper section sleeve of the pressure-bearing nipple and the drilling fluid and the buoyancy of the floating screen pipe section, the floating lowering technology of the horizontal section screen pipe is adopted, the problem of difficult lowering of the large-displacement horizontal well screen pipe is solved, after the pipe column is lowered to the design depth, the floating guide part of the floating screen pipe is opened by the special tool, and subsequent production or construction operation is convenient and reliable to use.
Drawings
Fig. 1 is a schematic diagram of the overall structure of the present invention.
Fig. 2 is a schematic structural view of a floating screen of the present invention.
Fig. 3 is a schematic structural view of the pressure-bearing nipple of the present invention.
Fig. 4 is a schematic view of a partial enlarged structure of a portion a in fig. 2.
Fig. 5 is a schematic structural diagram of the special tool of the present invention.
In the figure, 1, a floating screen pipe; 2. a pressure-bearing nipple; 3. an upper casing; 4. a first base pipe; 5. guiding the sealing head; 6. a second base pipe; 7. an upper joint; 8. a flow guiding part; 9. sand control screen pipe; 10. sealing the tube; 11. a pressure bearing plate; 12. shearing pins; 13. an upper sealing ring; 14. a lower sealing ring; 15. an elastic claw; 16. clamping springs; 17. a clamping groove; 18. a groove; 19. isolating the support ring; 20. a limit part; 21. a transition groove; 22. a non-return groove; 23. a flow-aiding groove; 24. a drill pipe joint; 25. a central tube; 26. a spring sleeve; 27. a claw; 28. an upper baffle ring; 29. and (5) pressing down the ring.
Detailed Description
In order to clearly illustrate the technical features of the present solution, the present invention will be described in detail below with reference to the following detailed description and the accompanying drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced otherwise than as described herein, and thus the scope of the present application is not limited by the specific embodiments disclosed below.
In addition, in the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," etc. indicate or refer to an azimuth or a positional relationship based on that shown in the drawings, and are merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus or element in question must have a specific azimuth, be configured and operated in a specific azimuth, and therefore should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
In this application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
As shown in fig. 1-5, the screen pipe structure capable of being floated and lowered into an oil-gas well comprises a floating screen pipe 1, a pressure-bearing short section 2 and an upper section sleeve pipe 3, wherein the floating screen pipe 1 comprises a first base pipe 4, a guiding sealing head 5 is arranged at the bottom end of the first base pipe 4, the circumferential outer wall at the top end of the first base pipe 4 is connected with the bottom end of a second base pipe 6, the top end of the second base pipe 6 is connected with an upper joint 7, the pipe wall of the second base pipe 6 is provided with a flow guiding part 8, the inner side and the outer side of the second base pipe 6 are communicated by the flow guiding part 8, a sand-preventing screen pipe 9 is arranged outside the first base pipe 4, the top end of the sand-preventing screen pipe 9 is connected with the circumferential outer wall of the second base pipe 6, and the distance between the sand-preventing screen pipe 9 and the upper joint 7 is smaller than the distance between the flow guiding part 8 and the upper joint 7; the circumference inner wall of the second base pipe 6 is provided with a sealing pipe 10, and the sealing pipe 10 is provided with a first state for sealing the flow guiding part 8 and a second state for opening the flow guiding part 8; the pressure-bearing nipple 2 is connected with the upper joint 7, and the inner wall of the pressure-bearing nipple 2 is provided with a pressure-bearing plate 11; the upper casing 3 is connected with the pressure-bearing short section 2, and the upper casing 3 is suitable for conveying drilling fluid; the bearing plate 11 has a rated bearing value, and when the bearing plate 11 bears that the pressure of the drilling fluid is smaller than the rated pressure value, the bearing plate 11 can limit the drilling fluid to enter the floating screen 1. When the floating screen pipe 1 is used, a double-layer composite technology is adopted, namely, a sand control screen pipe 9 is arranged at the outer side, a high-strength first base pipe 4 and a high-strength second base pipe 6 are arranged at the inner side, the floating screen pipe 1 and an upper-section sleeve 3 are connected by utilizing a pressure-bearing short section 2, the pressure-bearing short section 2 and the floating screen pipe 1 are connected into the upper-section sleeve 3 according to design requirements, pipe column running operation is carried out according to requirements, grouting is started after the pipe column is run into the position of the pressure-bearing short section 2, the pipe column is run into the bottom of a well by utilizing the dual functions of the gravity of the upper-section sleeve 3 of the pressure-bearing short section 2 and drilling fluid and the buoyancy of the floating screen pipe 1, and the problem of difficulty in running of a large-displacement horizontal well screen pipe is solved by adopting a horizontal-section screen pipe 1 floating running technology; when the pipe column is put into the designed depth, the wellhead is pressed down to destroy the bearing plate 11 of the pressure-bearing nipple joint 2, so that the inside and outside of the floating screen pipe 1 are smooth; finally, the diversion part of the floating sieve tube is opened by using special equipment, the subsequent production or construction operation is carried out, the use operation is convenient and reliable, the wellhead drill rod is connected with the special equipment, the sealing tube 10 is moved from the first state to the second state by being put into the position of the floating sieve tube 1, the diversion part 8 is leaked, the inside and outside of the floating sieve tube 1 are communicated, and the subsequent production or construction operation is carried out, so that the use operation is convenient and reliable.
It is understood that the bearing plate 11 in the bearing nipple 2 is a tempered glass plate. Specifically, the pressure-bearing nipple 2 comprises a casing 201, a pressure-bearing plate 11 is arranged in the casing 201, one axial side of the pressure-bearing plate 11 is abutted against a clamping groove on the inner wall of the casing 201, the other axial side of the pressure-bearing plate 11 is fixed through a pressure ring 202, and the pressure ring 202 is connected with the circumferential inner wall of the casing 201.
In the preferred embodiment, the sealing tube 10 is connected to the inner wall of the second base tube 6 through the shear pin 12, and an upper sealing ring 13 and a lower sealing ring 14 connected to the inner wall of the second base tube 6 are disposed on the outer circumferential wall of the lower section of the sealing tube 10 along the axial direction of the outer circumferential wall, and the upper sealing ring 13 and the lower sealing ring 14 are disposed on two radial sides of the flow guiding portion 8, so that the sealing tube 10 forms a first state of sealing the flow guiding portion 8.
In the preferred embodiment, the top end of the sealing tube 10 is provided with an elastic claw 15, the circumferential outer wall of the elastic claw 15 is provided with a clamping spring 16, the circumferential inner wall of the bottom end of the upper joint 7 is provided with a clamping groove 17 which can be matched with the clamping spring 16, the inner wall of the elastic claw 7 is provided with a groove 18, the groove 18 can be matched with special equipment, the shearing pin 12 can be cut off after the special equipment is matched with the groove 18, the sealing tube 10 can move along the axial direction of the second base tube 6, the clamping spring 16 of the elastic claw 15 is matched with the clamping groove 17 of the upper joint 7, so that the position of the sealing tube 10 is fixed, and the sealing tube 10 is in a second state of opening the diversion part 8.
In the preferred embodiment, a plurality of isolation support rings 19 are axially arranged between the sand control screen 9 and the first base pipe 4, and the bottom end of the sand control screen 9 is connected with the guiding sealing head 5. The annular belt between the first base pipe 4 and the sun-proof screen pipe 9 is supported and fixed through the isolation supporting ring 19, so that the structural integrity of the floating screen pipe 1 is improved, and the compression resistance of the sand-proof screen pipe 9 is improved.
In a preferred embodiment, the flow guiding part 8 is provided as a plurality of flow guiding openings uniformly arranged along the circumferential wall of the second base pipe. It will be appreciated that the flow directing orifice structure may be provided as a circular orifice, slot or other opening structure.
In the preferred embodiment, the anti-falling structure further comprises an anti-falling structure, wherein the anti-falling structure comprises a limiting part 20 arranged on the outer wall of the sealing tube 10, when the sealing tube 10 is in a first state, a transition groove 21 matched with the limiting part 20 is arranged on the inner wall of the second base tube 6, and a non-return groove 22 is arranged on the inner wall of the second base tube 6; when the sealing tube 10 is in the second state, the stopper 20 and the check groove 22 of the sealing tube 10 cooperate with each other to restrict movement of the sealing tube 10 in the axial direction.
In the preferred embodiment, the limiting part 20 is provided with chamfers along the two axial ends of the sealing tube 10, the notch of the transition groove 21 is provided with a chamfer structure matched with the limiting part 20, and the notch position of the non-return groove 22 near one side of the transition groove 21 is provided with a right-angle structure. When the sealing tube 10 is in use, when moving from the first state position to the second state position, the chamfer structures of the transition groove 21 and the limiting part 20 can enable the limiting part 20 of the sealing tube 10 to smoothly move out of the transition groove 21 and be in a pressed state, when the sealing tube 10 is in the second state, namely, the limiting part 20 of the sealing tube 10 moves into the check groove 22, the right-angle structure is arranged on one side of the check groove 22 close to the transition groove 21, the limiting part 20 can be limited in the check groove 22, and the positions of the sealing tube 10 are further fixed by matching with the structures of the clamping springs 16 of the elastic claws 15 and the clamping grooves 17 of the upper connector 7.
In a preferred embodiment, the flow guiding portion 8 is provided with a flow assisting groove 23 at a position corresponding to the inner wall of the second base pipe 6, and the flow assisting groove 23 can reduce the drilling fluid pressure born by the position of the flow guiding portion 8 when the drilling fluid flows outwards from the flow guiding portion 8. In order to reduce the pressure of drilling fluid on the position of the diversion part 8, the second base pipe 6 at the position of the diversion part 8 is prevented from being complete in structure, and the flow-assisting groove 23 is arranged at the opening position of the inner side of the diversion part 8, so that the effect of buffering and flow assisting can be achieved.
In a preferred embodiment, the special equipment comprises a drill pipe joint 24, a central pipe 25 and a spring housing 26, the drill pipe joint 24 being adapted to be connected to a drill pipe; the central pipe 25 is connected with the drill rod joint 24; the spring housing 26 is arranged on the outer circumference of the central tube 25, the outer circumference wall of the spring housing 26 is provided with a claw 27 matched with the groove 18 of the elastic claw 15, and a gap is reserved between the claw 27 of the spring housing 26 and the central tube 25, so that the claw of the spring housing 26 can elastically deform along the radial direction of the central tube 25. When the device is used, after the bearing plate 11 in the pressure-bearing nipple joint 2 is damaged, drilling fluid fills the inside of the floating screen pipe 1, after the drill rod joint 24 is connected with an external drill rod, special equipment is put into the floating screen pipe 1, the claw 27 of the spring sleeve 26 is matched with the groove 18 of the elastic claw 15, the shear pin 12 connected with the sealing pipe 10 and the second base pipe 6 is damaged by the spring sleeve 26, the diversion part 8 is leaked, the internal and external communication of the floating screen pipe 1 is realized, the sealing pipe 10 is moved from the first state position to the second state position, after the clamping spring 16 of the elastic claw 15 is matched with the clamping groove 17 of the upper joint 7, the position of the sealing pipe 10 is fixed, at the moment, the special equipment is continuously lifted, the elastic sleeve 26 is stressed to deform so as to be separated from the groove 18 of the elastic claw 15, the special equipment is taken out, and the construction is completed.
In the preferred embodiment, an upper baffle ring 28 is arranged outside the central tube 25, the top end of the spring sleeve 26 is connected with the upper baffle ring 28, the bottom end of the spring sleeve 26 is connected with the lower pressing ring 2, and the lower pressing ring 29 is connected with the central tube 25; the bottom end of the spring sleeve 26 is mutually buckled with the lower pressing ring 29.
The above embodiments are not to be taken as limiting the scope of the invention, and any alternatives or modifications to the embodiments of the invention will be apparent to those skilled in the art and fall within the scope of the invention.
The present invention is not described in detail in the present application, and is well known to those skilled in the art.
Claims (8)
1. A floatable screen construction for an oil and gas well comprising:
the floating screen comprises a first base pipe, a guiding sealing head is arranged at the bottom end of the first base pipe, the circumferential outer wall of the top end of the first base pipe is connected with the bottom end of a second base pipe, the top end of the second base pipe is connected with an upper joint, a flow guiding part is arranged on the pipe wall of the second base pipe, the inner side and the outer side of the second base pipe are communicated through the flow guiding part, a sand prevention screen is arranged outside the first base pipe, the top end of the sand prevention screen is connected with the circumferential outer wall of the second base pipe, and the distance between the connecting position of the sand prevention screen and the second base pipe and the upper joint is smaller than the distance between the flow guiding part and the upper joint; the circumference inner wall of the second base pipe is provided with a sealing pipe, and the sealing pipe is provided with a first state for sealing the flow guiding part and a second state for opening the flow guiding part;
the pressure-bearing nipple is connected with the upper joint and comprises a shell, a pressure-bearing plate is arranged in the shell, one axial side of the pressure-bearing plate is abutted against a clamping groove on the inner wall of the shell, the other axial side of the pressure-bearing plate is fixed through a pressure ring, and the pressure ring is connected with the circumferential inner wall of the shell;
the upper section of casing is connected with the pressure-bearing short section and is suitable for conveying drilling fluid;
the bearing plate has a rated bearing value, and when the pressure of drilling fluid borne by the bearing plate is smaller than the rated pressure value, the bearing plate can limit the drilling fluid to enter the floating sieve tube;
the sealing tube is connected with the inner wall of the second base tube through a shearing pin, an upper sealing ring and a lower sealing ring which are connected with the inner wall of the second base tube are arranged on the outer wall of the circumference of the lower section of the sealing tube along the axial direction of the sealing tube, and the upper sealing ring and the lower sealing ring are respectively arranged on the two radial sides of the flow guiding part, so that the sealing tube forms a first state of sealing the flow guiding part;
the top of sealed tube is equipped with the elastic claw, the circumference outer wall of elastic claw is equipped with the jump ring, the bottom circumference inner wall of top connection be equipped with can with jump ring matched with draw-in groove, the inner wall of elastic claw is equipped with the recess, the recess can cooperate with professional equipment, can make after professional equipment and the recess cooperation cut off the pin, make the seal pot follow the axial displacement of second base tube, make the jump ring of elastic claw with the draw-in groove of top connection cooperatees, in order to fix the position of sealed tube makes the sealed tube be in the second state of opening water conservancy diversion portion.
2. The floatable screen construction of claim 1 wherein a plurality of spacer support rings are axially disposed between the sand control screen and the first base pipe, the bottom end of the sand control screen being connected to the pilot seal head.
3. The floatable screen pipe structure of claim 2, wherein the flow guiding portion is provided as flow guiding ports, and the flow guiding ports are uniformly provided with a plurality of flow guiding ports along the circumferential pipe wall of the second base pipe.
4. The floatable screen pipe structure for an oil and gas well according to claim 3, further comprising an anti-drop structure, wherein the anti-drop structure comprises a limit part arranged on the outer wall of the sealing pipe, and when the sealing pipe is in a first state, a transition groove matched with the limit part is arranged on the inner wall of the second base pipe, and a non-return groove is arranged on the inner wall of the second base pipe; when the sealing tube is in the second state, the limiting part of the sealing tube and the check groove are matched with each other so as to limit the sealing tube to move along the axial direction.
5. The floatable screen pipe structure of claim 4, wherein the limiting portions are provided with chamfers along the two axial ends of the sealing pipe, the notch of the transition groove is provided with a chamfer structure matched with the limiting portions, and the notch position of the non-return groove close to one side of the transition groove is set to be a right-angle structure.
6. The floatable screen pipe structure of claim 4 or 5, wherein the diversion portion is provided with a flow-assisting groove at a position corresponding to the inner wall of the second base pipe, and the flow-assisting groove is capable of reducing drilling fluid pressure born by the diversion portion when the drilling fluid flows outwards from the diversion portion.
7. The oil and gas well floatable screen construction of claim 6 wherein the special equipment comprises
A drill pipe joint adapted to be connected to a drill pipe;
the central pipe is connected with the drill pipe joint;
the spring housing, the spring housing sets up the circumference outside of center tube, the circumference outer wall of spring housing is equipped with the jack catch with the recess matched with of elastic claw, the jack catch of spring housing with have the clearance between the center tube, make the jack catch of spring housing can take place elastic deformation along the radial of center tube.
8. The floatable screen pipe structure of claim 7, wherein the base pipe is provided with an upper baffle ring, the top end of the spring housing is connected with the upper baffle ring, the bottom end of the spring housing is connected with a lower pressure ring, and the lower pressure ring is connected with the base pipe; the bottom of the spring sleeve is mutually buckled and connected with the lower pressing ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910894385.3A CN110500065B (en) | 2019-09-20 | 2019-09-20 | Screen pipe structure capable of being floated and lowered into oil-gas well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910894385.3A CN110500065B (en) | 2019-09-20 | 2019-09-20 | Screen pipe structure capable of being floated and lowered into oil-gas well |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110500065A CN110500065A (en) | 2019-11-26 |
| CN110500065B true CN110500065B (en) | 2024-03-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910894385.3A Active CN110500065B (en) | 2019-09-20 | 2019-09-20 | Screen pipe structure capable of being floated and lowered into oil-gas well |
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| CN (1) | CN110500065B (en) |
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| CN110500065A (en) | 2019-11-26 |
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