CN112943148A - Double-sealing suspension method and device for speed pipe column - Google Patents
Double-sealing suspension method and device for speed pipe column Download PDFInfo
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- CN112943148A CN112943148A CN202110035878.9A CN202110035878A CN112943148A CN 112943148 A CN112943148 A CN 112943148A CN 202110035878 A CN202110035878 A CN 202110035878A CN 112943148 A CN112943148 A CN 112943148A
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- 238000007789 sealing Methods 0.000 title claims abstract description 126
- 239000000725 suspension Substances 0.000 title claims abstract description 89
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000005520 cutting process Methods 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 230000007774 longterm Effects 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 21
- 238000004519 manufacturing process Methods 0.000 description 13
- 230000000694 effects Effects 0.000 description 10
- 239000007788 liquid Substances 0.000 description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 238000002955 isolation Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 3
- 230000002378 acidificating effect Effects 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 239000009096 changqing Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 239000002343 natural gas well Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000005514 two-phase flow Effects 0.000 description 1
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/04—Casing heads; Suspending casings or tubings in well heads
- E21B33/0422—Casing heads; Suspending casings or tubings in well heads a suspended tubing or casing being gripped by a slip or an internally serrated member
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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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1078—Stabilisers or centralisers for casing, tubing or drill pipes
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Abstract
The invention provides a speed pipe column double-seal suspension method and a device, wherein the seal suspension method comprises the following steps of S1 speed pipe column main suspension and main seal: after the speed pipe column is lowered into a shaft for a preset depth, a main suspension slip is thrown on the hanger body to realize first heavy suspension of the speed pipe column, and a lower jackscrew is screwed to compress a sealing rubber sleeve to realize main sealing; and (S2) auxiliary suspension and auxiliary sealing of the speed pipe column: putting an auxiliary hanging slip on the main hanging slip to realize the second hanging of the speed pipe column; a plurality of sealing rings are sleeved on the centering sleeve, then the centering sleeve is inserted into the upper port of the speed pipe column, the sealing rings sleeved on the centering sleeve are tightly pressed between the outer wall of the centering sleeve and the inner wall of the reducing flange and between the inner wall of the centering sleeve and the outer wall of the speed pipe column, and therefore auxiliary sealing among the centering sleeve, the speed pipe column and the reducing flange is gradually achieved. The invention realizes the long-term stable double suspension and sealing of the speed pipe column by combining the main suspension and the auxiliary suspension.
Description
Technical Field
The invention relates to the technical field of gas field exploitation, in particular to a speed pipe column double-sealing suspension method and device.
Background
Along with the continuous production time of the gas well, the productivity of the gas well is gradually reduced, liquid begins to accumulate at the bottom of the gas well when the production rate is lower than the critical liquid carrying flow rate, and if liquid discharging measures are not taken in time, the gas well can be flooded with water and even stops producing. The speed tubular column water drainage and gas production technology is based on the well bore two-phase flow and the minimum liquid carrying flow theory and is used in gas well
A coiled tubing with a small diameter is put into the tubing to serve as a production string, the coiled tubing is cut off and then hung on a gas production wellhead through a special hanger, the critical liquid carrying flow rate of the gas well can be reduced, the gas flow rate in a shaft is increased, the liquid carrying capacity of the gas well is improved, liquid is not accumulated in the gas well for a long time, and stable production of the gas well is guaranteed.
At present, the technology is applied to 1000 wells in the Changqing oil field with the highest annual output in China in an accumulated way, and the number of applied wells reaches hundreds every year, so that the technology becomes one of three main drainage and gas production technologies of the Changqing oil field. How to stably suspend the coiled tubing on a gas production wellhead for a long time is one of the keys of success and failure of the drainage and gas production process of the speed string. At present, only one slip is hung between a hanging device and a speed pipe column, and the speed pipe column is hung at a gas production wellhead for a long time and has certain safety risk. In addition, the fluids produced by the wells in the currently available devices come into direct contact with the hanging slips and tend to erode the slips, thereby causing the velocity string to hang down.
Disclosure of Invention
Based on the problems in the prior art, the invention aims to provide a speed pipe column double-sealing suspension device, which combines a main suspension and an auxiliary suspension, so as to realize double suspension between a hanger and a speed pipe column.
The invention also aims to provide a double-seal hanging method for the velocity string, wherein an isolation cavity is formed between the main seal and the auxiliary seal in the hanging method, so that the hanging slips are prevented from contacting with acidic gases such as hydrogen sulfide and carbon dioxide, and the hanging slips are protected from being corroded.
In order to achieve the purpose, the invention adopts the following technical scheme:
a speed pipe string double-sealing suspension method comprises the following steps:
s1, main suspension and main sealing of speed pipe column
After the speed pipe column is lowered into a shaft for a preset depth, a main suspension slip is thrown on the hanger body to realize first heavy suspension of the speed pipe column, and a lower jackscrew is screwed to compress a sealing rubber sleeve to realize main sealing;
s2, auxiliary hanging and auxiliary sealing of speed pipe column
Putting an auxiliary hanging slip on the main hanging slip to realize the second hanging of the speed pipe column; a plurality of sealing rings are sleeved on the centering sleeve, then the centering sleeve is inserted into the upper port of the speed pipe column, the sealing rings sleeved on the centering sleeve are tightly pressed between the outer wall of the centering sleeve and the inner wall of the reducing flange and between the inner wall of the centering sleeve and the outer wall of the speed pipe column, and therefore auxiliary sealing among the centering sleeve, the speed pipe column and the reducing flange is gradually achieved.
As a further preferred scheme, the speed string main suspension and main seal specifically comprises the following steps:
s101, mounting a hanger body on a wellhead main control valve;
s102, sequentially connecting a wellhead operation device comprising an operation window, a blowout preventer and an injection head with a hanger body;
s103, lowering the speed pipe column to a specified depth by using a continuous oil pipe operating vehicle, rotating a lower jackscrew, pushing a conical sleeve to move downwards, transmitting force to a sealing rubber sleeve through the conical sleeve, and sealing the annular space between the speed pipe column and the wellhead after the sealing rubber sleeve is compressed, deformed and expanded;
s104, after sealing is completed, opening the operation window, throwing in the main suspension slip, suspending the velocity string, then cutting off the velocity string by using the blowout preventer, and detaching the wellhead operation device arranged on the hanger body to complete the main suspension and main sealing operation of the velocity string.
As a further preferred scheme, the auxiliary suspension and auxiliary sealing of the speed string specifically comprises the following steps:
s201, putting an auxiliary hanging slip on the main hanging slip;
s202, sequentially sleeving a plurality of sealing rings on a centering sleeve, and inserting the centering sleeve into an upper port of a velocity string;
s203, aligning and inserting the center hole of the reducing flange with the upper end opening of the speed pipe column, and then fixedly connecting the reducing flange with the hanger body by using a fastening bolt, so that auxiliary sealing among the centering sleeve, the speed pipe column and the reducing flange is completed.
A speed pipe column double-sealing suspension device at least comprises a speed pipe column, a centering sleeve, a reducing flange and a suspension body, wherein the centering sleeve, the reducing flange and the suspension body are sequentially sleeved on the outer side of the speed pipe column from top to bottom; the improved pipe string speed reducer is characterized in that an auxiliary hanging slip is arranged in the reducing flange, a main hanging slip and a main sealing assembly are arranged in the hanger body, the bottom of the auxiliary hanging slip is abutted to the top of the main hanging slip, the inner wall of the auxiliary hanging slip and the inner wall of the main hanging slip are respectively fixedly clamped with the outer wall of the speed pipe string, the inner wall of the main sealing assembly is righted and is respectively connected with the outer wall of the speed pipe string in a sealing mode, the outer wall of the righting sleeve is connected with the inner wall of the reducing flange in a sealing mode, and the outer wall of the main sealing assembly is connected with the inner wall of the hanger body in a sealing mode.
As a further preferable scheme, the inner wall of the reducing flange is of a stepped structure with the upper inner diameter smaller than the lower inner diameter, the outer wall of the top of the hanger body is provided with a flange structure, and the flange of the reducing flange is fixedly connected with the flange at the top of the hanger body through bolts.
As a further preferable scheme, an annular first limiting boss is arranged on the outer wall of the lower part of the centering sleeve along the circumferential direction of the centering sleeve, and the top surface of the first limiting boss is tightly attached to the stepped surface on the inner wall of the reducing flange; the centering sleeve is sleeved with a plurality of sealing rings, each sealing ring comprises an inner sealing ring and an outer sealing ring, the outer sealing ring is tightly pressed between the outer wall of the centering sleeve and the inner wall of the reducing flange, and the inner sealing ring is tightly pressed between the inner wall of the centering sleeve and the outer wall of the speed pipe column.
As a further preferable scheme, a first through hole is formed in the side wall of the reducing flange, and an upper jackscrew is connected to the outer side of the first through hole in a threaded manner.
As a further preferred scheme, main seal assembly establishes in proper order from top to bottom the taper sleeve, the sealed packing element and the adapter sleeve in the speed tubular column outside, be provided with annular second spacing boss along its circumference on the inner wall of hanger body, the bottom of adapter sleeve with the top looks butt of the spacing boss of second, the sealed packing element compress tightly in between the bottom of taper sleeve and the top of adapter sleeve.
As a further preferable scheme, a plurality of second through holes are formed in the outer wall of the hanger body along the circumferential direction of the hanger body, a lower jackscrew is arranged in each second through hole, one end of each lower jackscrew is located outside the hanger body, and the other end of each lower jackscrew extends into each second through hole and is connected with the top of the corresponding conical sleeve in an abutting mode; annular metal gaskets are arranged between the outer wall of the lower jackscrew and the inner wall of the second through hole, between the top of the connecting sleeve and the bottom of the sealing rubber cylinder and between the bottom of the conical sleeve and the top of the sealing rubber cylinder.
As a further preferable scheme, the top of the conical sleeve is a conical surface, the end of the lower jackscrew is a conical surface matched with the top of the conical sleeve, and the end of the lower jackscrew is connected with the top of the conical sleeve in an abutting mode.
The invention has the beneficial effects that:
1. according to the double-sealing suspension device for the speed pipe column, the secondary suspension slip is put on the main suspension slip to realize the secondary suspension of the speed pipe column, and the upper jackscrew arranged on the side surface of the reducing flange is used for fastening the secondary suspension slip, so that the speed pipe column is prevented from moving upwards when the airflow in a shaft is too large.
2. According to the invention, the main suspension and the auxiliary suspension are combined, so that double suspension between the hanger and the speed pipe column is realized, and the long-term stable suspension and sealing of the speed pipe column at the wellhead of the natural gas well are ensured.
3. According to the speed pipe column double-seal suspension method, an isolation cavity can be formed between the main seal and the auxiliary seal, so that the suspension slip is prevented from contacting with acidic gases such as hydrogen sulfide and carbon dioxide, and the suspension slip is protected from being corroded.
4. This speed tubular column double seal linkage's main seal adopts down jackscrew to adjust and become more meticulous control the compression capacity of sealed packing element, and supplementary seal adopts the sealing ring structure to seal, has both guaranteed the long-term effect of main sealed effect, has simplified supplementary sealed structure again, when making supplementary seal have the secondary seal effect, can play the effect of rightting and guiding to the speed tubular column, and the well head is thrown in the follow-up working process of being convenient for and is blocked up and play operation supporting tools such as pipe and pass through smoothly.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to clearly understand the technical solutions of the present invention and to implement the technical solutions according to the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other designs and drawings without creative efforts.
Fig. 1 is a schematic structural diagram of the velocity string double seal suspension apparatus.
Description of reference numerals:
1. a centralizing sleeve; 2. a seal ring; 3. a variable diameter flange; 4. a secondary suspension slip; 5. a bolt; 6. screwing a jackscrew; 7. a primary suspension slip; 8. a conical sleeve; 9. a top thread is arranged; 10. sealing the rubber cylinder; 11. connecting sleeves; 12. a velocity string; 13. a hanger body.
Detailed Description
The conception, the specific structure, and the technical effects produced by the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the features, and the effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention. In addition, all the coupling/connection relationships mentioned herein do not mean that the components are directly connected, but mean that a better coupling structure can be formed by adding or reducing coupling accessories according to specific implementation conditions.
Example 1:
the embodiment provides a double-sealing suspension method for a speed pipe column, which comprises the following steps:
s1, main suspension and main sealing of speed pipe column
After the speed pipe column 12 is lowered into a shaft for a preset depth, a main suspension slip 7 is thrown on a hanger body 13 to realize first heavy suspension of the speed pipe column 12, and a lower jackscrew 9 is screwed to compress a sealing rubber sleeve 10 to realize main sealing;
s2, auxiliary hanging and auxiliary sealing of speed pipe column
Putting an auxiliary hanging slip 4 on the main hanging slip 7 to realize the second hanging of the speed pipe column 12; the sealing rings 2 are sleeved on the centering sleeve 1, then the centering sleeve 1 is inserted into the upper end opening of the speed pipe column 12, the sealing rings 2 sleeved on the centering sleeve 1 are respectively compressed between the centering sleeve 1 and the reducing flange 3 and between the centering sleeve 1 and the speed pipe column 12, and therefore auxiliary sealing among the centering sleeve 1, the speed pipe column 12 and the reducing flange 3 is gradually achieved.
The speed pipe column double-seal suspension method combines the main suspension and the auxiliary suspension, so that double suspension between the hanger and the speed pipe column is realized, and the sealing method can form an isolation cavity between the main seal and the auxiliary seal, so that the suspension slip is prevented from contacting with acidic gases such as hydrogen sulfide, carbon dioxide and the like, and the suspension slip is protected from being corroded.
Example 2:
on the basis of the embodiment 1, as a further preferable scheme, the speed pipe column main suspension and main seal specifically comprise the following steps:
s101, mounting a hanger body 13 on a wellhead main control valve;
s102, sequentially connecting a wellhead operation device comprising an operation window, a blowout preventer and an injection head with the hanger body 13;
s103, lowering the velocity string 12 to a specified depth by using a coiled tubing operation vehicle, rotating the lower jackscrew 9, pushing the conical sleeve 8 to move downwards, transmitting force to the sealing rubber sleeve 10 through the conical sleeve 8, and sealing the velocity string 12 and an annulus at a wellhead after the sealing rubber sleeve 10 is compressed, deformed and expanded;
s104, after sealing is finished, opening the operation window, putting in the main suspension slip 7, suspending the velocity string 12, then cutting off the velocity string 12 by using the blowout preventer, and detaching the wellhead operation device arranged on the hanger body 13 to finish the main suspension and main sealing operation of the velocity string 12.
As a further preferred scheme, the auxiliary suspension and auxiliary sealing of the speed string specifically comprises the following steps:
s201, putting an auxiliary hanging slip 4 on the main hanging slip 7;
s202, sequentially sleeving a plurality of sealing rings on a centering sleeve 1, and inserting the centering sleeve 1 into an upper port of a velocity string 12;
s203, aligning and inserting a center hole of the reducing flange 3 with an upper end opening of the speed pipe column 12, and then fixedly connecting the reducing flange 3 with the hanger body 13 by using the fastening bolt 5, so that auxiliary sealing among the centralizing sleeve 1, the speed pipe column 12 and the reducing flange 3 is completed.
Example 3:
as shown in fig. 1, the embodiment provides a speed pipe column double-sealing suspension device, which at least comprises a speed pipe column 12, and a centering sleeve 1, a reducing flange 3 and a suspension body 13 which are sequentially sleeved outside the speed pipe column 12 from top to bottom, wherein the centering sleeve 1 is located in the reducing flange 3, and the bottom of the reducing flange 3 is fixedly connected with the top of the suspension body 13; be provided with vice slips 4 that hang in the reducing flange 3, be provided with owner in the hanger body 13 and hang slips 7 and main seal assembly, vice bottom and the main top looks butt that hangs slips 7 that hangs slips 4, and vice inner wall that hangs slips 4 and the main inner wall that hangs slips 7 respectively with the fixed joint of outer wall of speed tubular column 12, right cover 1 the inner wall with main seal assembly's inner wall respectively with the outer wall sealing connection of speed tubular column 12, right cover 1 the outer wall and the inner wall sealing connection of reducing flange 3, main seal assembly's outer wall and hanger body 13's inner wall sealing connection.
The hanger body plays a role in hanging and mainly sealing the speed pipe column, the reducing flange plays a role in reducing, the reducing flange is convenient to be in butt joint with a valve on a gas production tree, and meanwhile, the hanger body also has an auxiliary hanging and sealing effect.
According to the invention, the stability and safety of the speed tubular column suspension are greatly improved by arranging the double-suspension structure of the auxiliary suspension slip and the main suspension slip, and the double-sealing structure of the centering sleeve and the main sealing assembly is arranged, so that the speed tubular column double-sealing suspension device has a good sealing effect, and the isolation capability of the speed tubular column double-sealing suspension device on a production channel is improved.
Example 4:
on the basis of the above embodiment, as a further preferable scheme, the inner wall of the reducing flange 3 is of a stepped structure with an upper inner diameter smaller than a lower inner diameter, the outer wall of the top of the hanger body 13 is provided with a flange structure, and the flange of the reducing flange 3 is fastened and connected with the flange of the top of the hanger body 13 through bolts 5.
As a further preferable scheme, an annular first limiting boss is arranged on the outer wall of the lower part of the centering sleeve 1 along the circumferential direction of the centering sleeve, and the top surface of the first limiting boss is tightly attached to the stepped surface on the inner wall of the reducing flange; the centering sleeve 1 is sleeved with a plurality of sealing rings 2, each sealing ring 2 comprises an inner sealing ring and an outer sealing ring, the outer sealing ring is tightly pressed between the outer wall of the centering sleeve 1 and the inner wall of the reducing flange 3, and the inner sealing ring is tightly pressed between the inner wall of the centering sleeve 1 and the outer wall of the speed pipe column 12.
As a further preferable scheme, a first through hole is formed in the side wall of the reducing flange 3, and an upper jackscrew 6 is connected to the outer side of the first through hole in a threaded manner. The invention provides a hanging slip utilizing an upper jackscrew fastening pair arranged on the side surface of a reducing flange, which can effectively prevent a velocity string from moving upwards when airflow in a shaft is too large.
It should be further noted that the auxiliary hanging slips in the slip hanger can be suspended for standby, the bottom of the auxiliary hanging slips is connected with the top of the main hanging slips in an abutting mode, when the auxiliary hanging slips fail and the speed pipe column slips down, the auxiliary hanging slips take effect immediately and play a role in hanging the speed pipe column, the speed pipe column can drive the main hanging slips to move downwards in the process of slipping down, and therefore axial force generated by pipe weight of the speed pipe column is converted into axial pre-tightening force of the main hanging slips, the main hanging slips are further contracted, the speed pipe column can drive the auxiliary hanging slips to move downwards in the process of slipping down, downward pressing force is provided for the main hanging slips, further contraction of the main hanging slips can be promoted, and the main hanging slips can be restored to a state of stably hanging the speed pipe column.
Example 5:
on the basis of the above embodiment, as a further preferred scheme, the main seal assembly includes that the taper sleeve 8, the sealing rubber sleeve 10 and the connecting sleeve 11 that are established in proper order from top to bottom outside the velocity pipe column 12, be provided with annular second spacing boss along its circumference on the inner wall of hanger body 13, the bottom of connecting sleeve 11 with the top looks butt of second spacing boss, sealing rubber sleeve 10 compress tightly in between the bottom of taper sleeve 8 and the top of connecting sleeve 11.
As a further preferable scheme, a plurality of second through holes are formed in the outer wall of the hanger body 13 along the circumferential direction of the hanger body, a lower jackscrew 9 is arranged in each second through hole, one end of each lower jackscrew 9 is located outside the hanger body 13, and the other end of each lower jackscrew 9 extends into each second through hole and is connected with the top of the corresponding conical sleeve 8 in an abutting mode.
As a further preferable scheme, the top of the conical sleeve 8 is a conical surface, the end of the lower jackscrew 9 is a conical surface matched with the top of the conical sleeve 8, and the end of the lower jackscrew 9 is connected with the top of the conical sleeve 8 in an abutting mode.
It should be further noted that annular metal gaskets are disposed between the outer wall of the lower jackscrew 9 and the inner wall of the second through hole, between the top of the connecting sleeve 11 and the bottom of the sealing rubber cylinder 10, and between the bottom of the conical sleeve 8 and the top of the sealing rubber cylinder 10. And the metal gaskets are correspondingly pressed between the connecting sleeve 11 and the sealing rubber cylinder 10 and between the conical sleeve 8 and the sealing rubber cylinder 10. The conical sleeve 8 and the connecting sleeve 11 are guaranteed not to deform when being extruded, extrusion force can be fully transmitted to sealing, and sealing rubber cylinders are fully compressed.
It is worth mentioning that the side surface of the hanger body is provided with a bypass channel, when the speed pipe column is put into the hanger, the annular space between the original oil pipe and the speed pipe column can be used for production, the well closing is not needed, and the situations that the pressure in the shaft is increased and the pipe descending resistance is increased due to the well closing are avoided.
Example 6:
the using process of the invention is as follows:
1. speed pipe column main suspension and main seal
The main seal assembly is first installed in the hanger body 13, and the end of each lower jackscrew 9 is adjusted to contact the top of the main seal assembly. During operation, the bottom of the hanger body 13 is arranged on a wellhead main valve, wellhead operation devices such as an operation window, a blowout preventer and an injection head are sequentially connected with a flange structure at the top of the hanger body 13, the speed pipe column 12 is lowered into a specified depth position below a wellhead by using a continuous pipe operation machine, and each lower jackscrew 9 is rotated to enable the sealing rubber barrel 10 to be pressed to deform, so that the annular space between the speed pipe column 12 and the wellhead is sealed; after the main sealing assembly completes sealing, a movable window of the operation window is opened, a main suspension slip 7 is thrown into the hanger body 13, after the main suspension slip suspends the speed pipe column 12, the upper portion of the speed pipe column 12 is cut, the well mouth operation device connected to the speed pipe column 12 is disassembled, and main suspension and main sealing of the speed pipe column 12 are completed.
2. Auxiliary hanging and auxiliary sealing of speed pipe column
Reserving a certain length of the sheared velocity pipe column 12 above the wellhead, shearing the upper part of the velocity pipe column 12 again by using a cutting tool, and sleeving the auxiliary suspension slips 4 on the outer side of the velocity pipe column 12; install O type sealing washer 2 on righting cover 1 from last to down in proper order, will right the upper port of cover 1 insertion speed tubular column 12, right 1 upper port of cover and adopt the horn mouth design, the blanking plug that squeezes into during later stage speed tubular column 12 plays the operation of pipe smoothly gets into the inside of speed tubular column 12, then aim at the centre bore of reducing flange 3 and the upper port of speed tubular column 12 and insert, evenly screw up four fastening bolt 5 from four different position, it is fixed with reducing flange 3 and speed tubular column 12 connection to utilize fastening bolt 5, to this end, the subsection has been accomplished and has been right cover 1, speed tubular column 12, the supplementary sealing between the reducing flange 3 three.
In conclusion, the centralizing sleeve and the auxiliary hanging slips are arranged in the reducing flange, and the main hanging slips and the main sealing assembly are arranged in the hanger body, so that the double hanging and double sealing effects on the speed pipe column are achieved, the stability and the safety of the speed pipe column hanging are greatly improved, the anti-vibration capability and the suspension stability maintaining capability of the speed pipe column double sealing hanging device in the speed pipe column hanging state are improved, in addition, the sealing effect is good, the isolation capability of the speed pipe column double sealing hanging device on a production channel is improved, and the speed pipe column double sealing hanging device is suitable for large-scale popularization and use.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that the present invention is not limited to the details of the embodiments shown and described, but is capable of numerous equivalents and substitutions without departing from the spirit of the invention as set forth in the claims appended hereto.
Claims (10)
1. A double-sealing suspension method for a speed pipe column is characterized by comprising the following steps:
s1, main suspension and main sealing of speed pipe column
After the speed pipe column (12) is lowered into a shaft for a preset depth, a main suspension slip (7) is thrown on a hanger body (13) to realize first heavy suspension of the speed pipe column (12), and a lower jackscrew (9) is screwed to compress a sealing rubber sleeve (10) to realize main sealing;
s2, auxiliary hanging and auxiliary sealing of speed pipe column
Putting an auxiliary hanging slip (4) on the main hanging slip (7) to realize the second hanging of the speed pipe column (12); the sealing rings (2) are sleeved on the centering sleeve (1), then the centering sleeve (1) is inserted into an upper port of the speed pipe column (12), the sealing rings (2) sleeved on the centering sleeve (1) are respectively compressed between the centering sleeve (1) and the reducing flange (3) and between the centering sleeve (1) and the speed pipe column (12), and therefore auxiliary sealing among the centering sleeve (1), the speed pipe column (12) and the reducing flange (3) is gradually achieved.
2. The method for double seal suspension of a speed string according to claim 1, wherein the main suspension and main seal of the speed string specifically comprises the steps of:
s101, mounting a hanger body (13) on a wellhead main control valve;
s102, sequentially connecting a wellhead operation device comprising an operation window, a blowout preventer and an injection head with a hanger body (13);
s103, a coiled tubing operation vehicle is used for lowering the speed pipe column (12) to a specified depth, a lower jackscrew (9) is rotated to push the conical sleeve (8) to move downwards, force is transmitted to the sealing rubber sleeve (10) through the conical sleeve (8), and the sealing rubber sleeve (10) is compressed, deformed and expanded to seal the speed pipe column (12) and an annulus at a wellhead;
s104, after sealing is finished, opening the operation window, putting in a main suspension slip (7), suspending a speed pipe column (12), cutting off the speed pipe column (12) by using a blowout preventer, and detaching a wellhead operation device arranged on a hanger body (13) to finish main suspension and main sealing operation of the speed pipe column (12).
3. The speed string double seal suspension method according to claim 1, wherein the speed string auxiliary suspension and auxiliary seal specifically comprises the steps of:
s201, putting an auxiliary suspension slip (4) on the main suspension slip (7);
s202, sequentially sleeving a plurality of sealing rings on a centering sleeve (1), and inserting the centering sleeve (1) into an upper port of a velocity string (12);
s203, aligning and inserting a center hole of the reducing flange (3) with an upper end opening of the speed pipe column (12), and then fixedly connecting the reducing flange (3) with the hanger body (13) by using the fastening bolt (5), so that auxiliary sealing among the centering sleeve (1), the speed pipe column (12) and the reducing flange (3) is completed.
4. The utility model provides a speed tubular column double seal linkage which characterized in that: the device at least comprises a speed pipe column (12), and a centralizing sleeve (1), a reducing flange (3) and a hanger body (13) which are sequentially sleeved on the outer side of the speed pipe column (12) from top to bottom, wherein the centralizing sleeve (1) is positioned in the reducing flange (3), and the bottom of the reducing flange (3) is fixedly connected with the top of the hanger body (13); be provided with vice slips (4) that hang in reducing flange (3), be provided with owner in hanger body (13) and hang slips (7) and main seal assembly, vice bottom and the main top looks butt that hangs slips (7) that hangs slips (4), and vice inner wall that hangs slips (4) and the main inner wall that hangs slips (7) respectively with the fixed joint of outer wall of speed tubular column (12), right the inner wall of cover (1) with main seal assembly's inner wall respectively with the outer wall sealing connection of speed tubular column (12), right the outer wall of cover (1) and the inner wall sealing connection of reducing flange (3), the outer wall of main seal assembly and the inner wall sealing connection of hanger body (13).
5. A speed string double seal suspension as claimed in claim 4 wherein: the inner wall of the reducing flange (3) is of a stepped structure, the inner diameter of the upper portion of the inner wall of the lower portion of the inner wall of the reducing flange is smaller than that of the lower portion of the inner wall of the hanger body (13), and the flange of the reducing flange (3) is tightly connected with the flange of the top of the hanger body (13) through bolts (5).
6. A speed string double seal suspension as claimed in claim 5 wherein: an annular first limiting boss is arranged on the outer wall of the lower part of the centering sleeve (1) along the circumferential direction of the centering sleeve, and the top surface of the first limiting boss is tightly attached to the step surface on the inner wall of the reducing flange (3); the centering sleeve (1) is sleeved with a plurality of sealing rings (2), each sealing ring (2) comprises an inner sealing ring and an outer sealing ring, the outer sealing ring is tightly pressed between the outer wall of the centering sleeve (1) and the inner wall of the reducing flange (3), and the inner sealing ring is tightly pressed between the inner wall of the centering sleeve (1) and the outer wall of the speed pipe column (12).
7. A speed string double seal suspension as claimed in claim 4 wherein: a first through hole is formed in the side wall of the reducing flange (3), and an upper jackscrew (6) is connected to the outer side of the first through hole in a threaded mode.
8. A speed string double seal suspension as claimed in claim 4 wherein: the main seal assembly comprises a taper sleeve (8), a seal rubber sleeve (10) and a connecting sleeve (11) which are sequentially sleeved from top to bottom, wherein the taper sleeve (8), the seal rubber sleeve (10) and the connecting sleeve (11) are arranged on the outer side of the speed pipe column (12), an annular second limiting boss is arranged on the inner wall of the hanger body (13) along the circumferential direction of the inner wall, the bottom of the connecting sleeve (11) is abutted to the top of the second limiting boss, and the seal rubber sleeve (10) is compressed between the bottom of the taper sleeve (8) and the top of the connecting sleeve (11).
9. A speed string double seal suspension as claimed in claim 8 wherein: a plurality of second through holes are formed in the outer wall of the hanger body (13) along the circumferential direction of the hanger body, a lower jackscrew (9) is arranged in each second through hole, one end of each lower jackscrew (9) is located outside the hanger body (13), and the other end of each lower jackscrew (9) extends into the corresponding second through hole and is connected with the top of the corresponding conical sleeve (8) in an abutting mode; annular metal gaskets are arranged between the outer wall of the lower jackscrew (9) and the inner wall of the second through hole, between the top of the connecting sleeve (11) and the bottom of the sealing rubber cylinder (10) and between the bottom of the conical sleeve (8) and the top of the sealing rubber cylinder (10).
10. A speed string double seal suspension as claimed in claim 8 wherein: the top of toper cover (8) is the conical surface, the tip of jackscrew (9) down be with the top matched with conical surface of toper cover (8), the tip of jackscrew (9) down with the top of toper cover (8) is supported and is leaned on the connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110035878.9A CN112943148A (en) | 2021-01-12 | 2021-01-12 | Double-sealing suspension method and device for speed pipe column |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110035878.9A CN112943148A (en) | 2021-01-12 | 2021-01-12 | Double-sealing suspension method and device for speed pipe column |
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| Publication Number | Publication Date |
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| CN112943148A true CN112943148A (en) | 2021-06-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110035878.9A Pending CN112943148A (en) | 2021-01-12 | 2021-01-12 | Double-sealing suspension method and device for speed pipe column |
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| Country | Link |
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| CN (1) | CN112943148A (en) |
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| CN201567998U (en) * | 2009-11-25 | 2010-09-01 | 中国石油天然气股份有限公司 | Drainage gas production well head sealed suspending device |
| CN111364936A (en) * | 2020-04-09 | 2020-07-03 | 中国石油天然气股份有限公司 | Speed tubular column sealing suspension device with auxiliary sealing and sealing method |
| CN211448599U (en) * | 2019-10-12 | 2020-09-08 | 中国石油天然气集团有限公司 | Slip type hanger and continuous pipe completion pipe string mounting structure |
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| CN201567998U (en) * | 2009-11-25 | 2010-09-01 | 中国石油天然气股份有限公司 | Drainage gas production well head sealed suspending device |
| CN211448599U (en) * | 2019-10-12 | 2020-09-08 | 中国石油天然气集团有限公司 | Slip type hanger and continuous pipe completion pipe string mounting structure |
| CN111364936A (en) * | 2020-04-09 | 2020-07-03 | 中国石油天然气股份有限公司 | Speed tubular column sealing suspension device with auxiliary sealing and sealing method |
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