CN110469285B - Rotary sealing wellhead for flushing and reinforcing outside oil-water well production casing - Google Patents
Rotary sealing wellhead for flushing and reinforcing outside oil-water well production casing Download PDFInfo
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- CN110469285B CN110469285B CN201810445448.2A CN201810445448A CN110469285B CN 110469285 B CN110469285 B CN 110469285B CN 201810445448 A CN201810445448 A CN 201810445448A CN 110469285 B CN110469285 B CN 110469285B
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- 238000007789 sealing Methods 0.000 title claims abstract description 103
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 61
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 238000011010 flushing procedure Methods 0.000 title claims abstract description 28
- 230000003014 reinforcing effect Effects 0.000 title description 6
- 238000005406 washing Methods 0.000 claims abstract description 30
- 230000007246 mechanism Effects 0.000 claims abstract description 18
- 230000002787 reinforcement Effects 0.000 claims abstract description 11
- 230000003068 static effect Effects 0.000 claims description 21
- 230000006835 compression Effects 0.000 claims description 16
- 238000007906 compression Methods 0.000 claims description 16
- 230000008878 coupling Effects 0.000 claims description 15
- 238000010168 coupling process Methods 0.000 claims description 15
- 238000005859 coupling reaction Methods 0.000 claims description 15
- 230000002265 prevention Effects 0.000 claims description 15
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 239000000956 alloy Substances 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 230000010354 integration Effects 0.000 claims 1
- 238000005728 strengthening Methods 0.000 claims 1
- 239000002002 slurry Substances 0.000 abstract description 6
- 239000004568 cement Substances 0.000 description 10
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 239000002775 capsule Substances 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 210000002445 nipple Anatomy 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 210000004907 gland Anatomy 0.000 description 2
- 230000033764 rhythmic process Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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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- 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
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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
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Abstract
The invention discloses a rotary sealing wellhead for external flushing reinforcement of an oil-water well production casing, which comprises a lower slip assembly, a casing head shell assembly, a production casing centralizer and an eccentric rotary flushing mechanism, wherein an eccentric rotary plug of the eccentric rotary flushing mechanism rotates relative to a casing head body of the casing head shell assembly and also rotates relative to the production casing centralizer. And the side outlet of the casing head body is connected with a side outlet flat valve. The washing pipe is inserted into the eccentric hole of the eccentric rotary plug, and the lower end of the washing pipe extends into the annular space between the outer sleeve and the production sleeve. The annular space between the outer sleeve (the surface sleeve or the technical sleeve) and the production sleeve is sealed, annular space sundries can be returned from the side outlet when the annular space is cleaned, and meanwhile, the flange can be pushed to rotate through the hydraulic motor and the speed reducing mechanism, so that the annular space is ensured to be cleaned comprehensively by 360 degrees. The well cementing device can be used as a well head device in well cementing, and has the functions of sealing and slurry returning of the side holes.
Description
Technical Field
The invention relates to a technology for flushing and reinforcing the outside of a free casing above the cement return height of the casing in oil-water well production of an oil field, in particular to a rotary seal wellhead for flushing and reinforcing the outside of the casing in oil-water well production.
Background
With the continuous and deep development work of the oil field, the oil field is stepped into the late stage of ultra-high water content development, and the cased broken wells are increased year by year and are aggravated year by year. Especially in recent years, the speed of the shallow sleeve leakage well of the water well is accelerated, and the main reason is that the outside of the sleeve is severely corroded due to no cement reinforcement outside the production sleeve. For example, in the eastern part of China, the water returning shallow sleeve leakage well 337 of the water well is found by 2017, and the average annual growth of the water returning shallow sleeve leakage well 337 is nearly 20 wells.
The current method for treating the sleeve damage of the oil-water well cement after returning to the high temperature mainly comprises three steps: firstly, sleeve replacement is performed. The oil-water well sleeve replacement can keep the diameter of the sleeve, is favorable for the smooth running-in of the post oil-water well rod, pipe, pump and downhole tool, the method is suitable for oil-water wells with good whole-well sleeve and more than 500 m shallow sleeve leakage, but the oil-water well sleeve replacement needs major repair, the construction site is higher in requirement, the cost is higher, the average single-well cost reaches 65 ten thousand yuan, moreover, the oil-water well sleeve replacement is only aimed at sleeve leakage sections, sleeve leakage can occur in the later production process of other sleeves, and sleeve replacement is needed again; and secondly, plugging by cement. The oil-water well casing damage cement plugging can also keep the diameter of the casing, and has low cost, but the shallow casing is in a softer stratum, so that the cement has poor residence property, large dosage, low success rate and short effective period; thirdly, the technology of sticking and reinforcing the inside of the sleeve. The method is to solidify the casing with cement in the casing with smaller inner diameter, but the casing diameter of the oil-water well casing is not uniform after casing damage treatment, which affects the lowering of the oil-water well pump and the downhole tool in the later stage, and can not carry out rhythm layer digging and separate water injection.
In order to meet the requirements of secondary reinforcement treatment of the free casing above the cement return height of the production casing, not only prolonging the service life of the oil-water well shallow casing, but also ensuring the unchanged drift diameter, and meeting the requirements of smooth running of a later-stage pump and a downhole tool, and ensuring the digging and separate-layer water injection of a rhythm layer of an oil-water well, the secondary reinforcement treatment technology of the free casing above the cement return height of the oil-water well production casing is provided, the purpose of prolonging the service life of the oil-water well shallow casing is achieved, the rotary seal wellhead for flushing and secondary reinforcement of the free casing above the cement return height of the oil-water well is invented, the requirements of continuous efficient production and water injection of the oil-water well in the later development stage are met, the long-service life application of the free casing of the oil-water well is achieved, and the oil field is enhanced.
Application number: 201410255755.6 and publication No. 2014-08-13 disclose a rotary sealing device, which comprises a static sealing ring and a rotary sealing ring, wherein the rotary sealing ring is attached to the static sealing ring, and the rotary sealing device is characterized in that a curve groove is formed in a sealing surface of the rotary sealing ring attached to the static sealing ring, the curve groove extends obliquely inwards from the outer circle of the rotary sealing ring but is not connected with the inner circle of the rotary sealing ring, and enters into a gap between the rotary sealing ring and the attaching surface of the static sealing ring and is centrifugally thrown out along with the curve groove when a sealed medium rotates, and the inclination direction of the curve groove is consistent with the rotation direction of the rotary sealing ring. According to the invention, the curved groove is arranged on the sealing surface of the rotary sealing ring, so that the sealed medium which tries to pass through the static pressure sealing area flows to the outer circumference of the sealing end surface and is discharged outwards, and a high-pressure area corresponding to the sealing medium is formed at the outer circumference of the sealing end surface, so that the sealed medium is prevented from passing through the high-pressure area, the sealing performance and the reliability of the device are greatly improved, and the service life is prolonged.
Application number: 201120162968.6, publication No. 2012-06-27 discloses a rotary sealing device for an oil well wellhead, which seals the wellhead when a drill string rotates or stops working in a workover operation in the oil industry. The device comprises an upper shell, a lower shell, a central tube, a square compensating core, a sealing capsule and a gland assembly, wherein the sealing capsule is arranged in the central tube, the central tube is arranged in the upper shell and the lower shell, a thrust bearing and a main bearing are arranged between the central tube and the upper shell, the square compensating core and the gland assembly are arranged at the tops of the central tube and the sealing capsule, a centralizing bearing is arranged below the main bearing, and the central holes of the sealing capsule are concentric in different shapes. The invention additionally provides the centralizing bearing, solves the problem that the lower part of the central tube is longer in bearing supporting point and easy to swing, and also better improves the sealing effect of the lower part of the central tube. Meanwhile, the application range is enlarged, and the drill string is suitable for cylindrical drill strings and square drill strings.
Application number: 201710987834.X, publication No. 2018-02-16 discloses a rotary seal type casing plug for wellhead pressure test, which comprises a hanger, an oil pipe nipple, a lifting sleeve, a rubber cylinder central tube, a base bearing and a screw rod, wherein a jackscrew groove is processed on the side wall of the top surface of the hanger, a hanger sealing rubber is installed on the side surface of the hanger, the oil pipe nipple is connected to the bottom of the hanger, a pressure test hole for pressure test liquid to flow out is drilled on the side wall of the middle part of the hanger, the lifting sleeve is sleeved on the outer side of the bottom of the oil pipe nipple, a wide saw-tooth type transmission thread is processed in an upper through hole of the lifting sleeve, the screw rod penetrates through the whole wellhead pressure test rotary seal type casing plug, the length of the transmission thread on the screw rod is longer than that of the upper through hole, the bottom end of the rubber cylinder central tube is suspended on the upper part of the base bearing, the top of the rubber cylinder central tube is suspended in the lifting sleeve, the rubber cylinder is sleeved on the rubber cylinder central tube, the bottom and the base bearing are wrapped in the base, and a limiting block is installed on the lower part of the screw transmission thread of the screw rod. The wellhead pressure test device ensures that the wellhead pressure test operation is simple, safe and reliable.
By retrieving keywords such as rotary sealing and wellhead cleaning, the technical problems, technical effects and the like of the technical proposal of the above-mentioned several publications are different, and the technical proposal is not provided.
Disclosure of Invention
The invention aims to provide a rotary sealing wellhead for flushing and reinforcing the outside of a production casing of an oil-water well, which seals and separates an annulus between the outside casing (a surface casing or a technical casing) and the production casing, can return annulus sundries from a side outlet when the annulus is cleaned, and can push a flange to rotate through a hydraulic motor and a speed reducing mechanism so as to ensure 360-degree comprehensive cleaning of the annulus. The well cementing device can be used as a well head device in well cementing, and has the functions of sealing and slurry returning of the side holes.
In order to achieve the purpose, the rotary sealing wellhead for external flushing reinforcement of the oil-water well production casing comprises a lower slip assembly, a casing head shell assembly, a production casing centralizer and an eccentric rotary flushing mechanism, wherein the casing head shell assembly comprises a casing head body, at least two radially-through side outlets are formed in the middle of the casing head body, the lower end of the casing head body is connected with the lower slip assembly, the lower slip assembly is sleeved on the outer wall of an outer casing, the upper end of the outer casing stretches into the casing head body, an outer casing static sealing structure is arranged on the inner wall of the casing head body, and the inner wall of the casing head body and the outer wall of the outer casing are in a sealing state through the outer casing static sealing structure; the eccentric rotary flushing mechanism comprises an eccentric rotary plug, a washing pipe and a blowout prevention flange, wherein the eccentric rotary plug is provided with a central hole and an eccentric hole, the production casing centralizer is installed in the central hole, the lower end of the production casing centralizer is connected with the upper end of the production casing, the production casing is concentrically positioned in the outer casing, the washing pipe is inserted in the eccentric hole, the lower end of the washing pipe extends into an annulus between the outer casing and the production casing, the blowout prevention flange is connected with the casing head body through a compression bolt, a compression nut is installed on the compression bolt, the lower end face of the blowout prevention flange is pressed on the upper end face of the eccentric rotary plug, the lower half section of the eccentric rotary plug extends into the casing head body, the inner wall of the casing head body is provided with an eccentric plug rotary sealing structure, the inner wall of the casing head body and the outer wall of the eccentric rotary plug are in a sealing state, the inner wall of the eccentric rotary plug is provided with a centralizer rotary sealing structure, and the rotary sealing structure of the eccentric rotary sealing structure is in a sealing state between the inner wall of the eccentric rotary plug and the production casing centralizer; the eccentric rotary plug rotates both with respect to the casing head body and with respect to the production casing centralizer.
The upper end of the eccentric rotary plug is provided with an expanding edge, the lower end face of the expanding edge and the upper end face of the casing head body are both provided with corresponding raceways, and pressure-bearing steel balls are placed in the raceways.
The pressure generated by the fact that the lower end face of the blowout prevention flange presses on the upper end face of the eccentric rotary plug is guaranteed not to prevent the eccentric rotary plug from freely rotating.
The production sleeve centralizer comprises a coupling joint and a centralizing pull rod, wherein the centralizing pull rod is installed at the upper half section of a central hole formed in the eccentric rotary plug, the coupling joint is installed at the lower half section of the central hole, the centralizing pull rod is connected with the upper end of the coupling joint, the lower end of the centralizing pull rod is connected with the production sleeve outside the central hole, an external wire is formed in the centralizing pull rod, the upper end of the centralizing pull rod is protruded outside the central pipe, a pull rod nut is installed, and the lower end face of the pull rod nut is blocked on the upper end face of the eccentric rotary plug.
The washing pipe is locked at the upper port of the eccentric hole through a washing pipe locking sleeve, and the outer wall of the washing pipe is sleeved with a washing pipe sealing sleeve which enables the outer wall of the washing pipe and the inner wall of the eccentric hole of the eccentric rotary plug to be in a sealing state.
And the side outlet of the casing head body is connected with a side outlet flat valve.
The lower slip assembly comprises a lower slip seat, a lower slip, a body support, a lower slip bolt and a lower slip nut, wherein the lower slip is positioned in the lower slip seat, the lower slip clamping sleeve is sleeved on the outer wall of the outer sleeve, the body support is covered outside the lower slip seat, the lower slip bolt sequentially penetrates through the lower slip seat and the top surface of the body support and then is connected onto the casing head body, and the lower slip nut is installed on the lower slip bolt.
The eccentric plug rotary sealing structure comprises a first annular groove formed in the inner wall of the casing head body and a first rotary sealing ring arranged in the first annular groove; the centralizer rotary sealing structure comprises a second annular groove formed in the inner wall of the eccentric rotary plug and a second rotary sealing ring arranged in the second annular groove; the outer sleeve static sealing structure arranged on the inner wall of the casing head body comprises a third annular groove formed in the inner wall of the casing head body and a static sealing ring arranged in the third annular groove.
Compared with the prior art, the invention has the following beneficial effects:
the device is a key device applied to casing annulus cleaning, and has the main effects of sealing and isolating the annulus between the surface casing or the technical casing and the production casing, returning annulus sundries from a side outlet when the annulus is cleaned, pushing the flange to rotate through the hydraulic motor and the speed reducing mechanism, and ensuring 360-degree comprehensive cleaning of the annulus. The well cementing device can be used as a well head device in well cementing, and has the functions of sealing and slurry returning of the side holes.
Drawings
FIG. 1 is a schematic diagram of a rotary seal wellhead for external flushing reinforcement of an oil-water well production casing;
FIG. 2 is a schematic diagram of a detailed labeling structure of the present invention.
In the figure: a lower slip assembly 1, a production casing centralizer 2, a casing head shell assembly 3 and an eccentric rotary flushing mechanism 4;
a lower slip bolt 10, a lower slip nut 11, a lower slip bowl 12, a lower slip 13, and a body bracket 14;
a coupling joint 20, a righting pull rod 21 and a pull rod nut 22;
casing head body 30, outer sleeve static seal structure 31, side outlet flat valve 32, centralizer rotary seal structure 33, eccentric plug rotary seal structure 34 and bearing steel ball 35;
an eccentric rotary plug 40, a blowout prevention flange 41, a wash pipe locking sleeve 42, a wash pipe sealing sleeve 43, a compression nut 44 and a compression bolt 45.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1 to 2, the rotary sealing wellhead for external flushing reinforcement of oil-water well production casing comprises a lower slip assembly 1, a casing head shell assembly 3, a production casing centralizer 2 and an eccentric rotary flushing mechanism 4, wherein the casing head shell assembly comprises a casing head body 30, at least two radially-through side outlets are formed in the middle of the casing head body, the lower end of the casing head body is connected with the lower slip assembly 1, the lower slip assembly is sleeved on the outer wall of an outer casing, the upper end of the outer casing stretches into the casing head body, an outer casing static sealing structure 31 is arranged on the inner wall of the casing head body, and the inner wall of the casing head body and the outer wall of the outer casing are in a sealing state by the outer casing static sealing structure; the eccentric rotary flushing mechanism comprises an eccentric rotary plug 40, a washing pipe and a blowout prevention flange 41, wherein the eccentric rotary plug is provided with a central hole and an eccentric hole, the production casing centralizer 2 is arranged in the central hole, the lower end of the production casing centralizer 2 is connected with the upper end of the production casing, the production casing is concentrically arranged in the outer casing, the washing pipe is inserted in the eccentric hole, the lower end of the washing pipe extends into an annulus between the outer casing and the production casing, the blowout prevention flange 41 is connected with the casing head body 40 through a compression bolt 45, the compression bolt is provided with a compression nut 44, the lower end face of the blowout prevention flange is pressed on the upper end face of the eccentric rotary plug, the lower half section of the eccentric rotary plug 40 extends into the casing head body 30, the inner wall of the casing head body is provided with an eccentric plug rotary sealing structure 34, the inner wall of the eccentric plug rotary sealing structure enables the inner wall of the casing head body and the outer wall of the eccentric rotary plug to be in a sealing state, the inner wall of the centralizer is provided with a centralizer rotary sealing structure 33, and the inner wall of the eccentric rotary plug and the production casing centralizer are in a sealing state; the eccentric rotary plug rotates both with respect to the casing head body and with respect to the production casing centralizer.
The upper end of the eccentric rotary plug is provided with an edge expansion, the lower end face of the edge expansion and the upper end face of the casing head body are provided with corresponding rollaway nest, and pressure-bearing steel balls 35 are placed in the rollaway nest.
The pressure generated by the fact that the lower end face of the blowout prevention flange presses on the upper end face of the eccentric rotary plug is guaranteed not to prevent the eccentric rotary plug from freely rotating. The upper end surfaces of the blowout prevention flange and the eccentric rotary plug are narrow in space, the upper part cannot be widened, and the flange cannot form complete rotation if the flange is widened due to the blocking of the bolts. The contact surface is narrow, so that the flange hardness and the surface finish are high, and the friction force is small. But may be improved, the following method is selected: the space is limited, the hard alloy is sintered on the contact surface and ground to a higher finish, and the friction between the two contact surfaces is reduced.
The production casing centralizer comprises a coupling joint 20 and a centralizing pull rod 22, wherein the centralizing pull rod 22 is installed on the upper half section of a central hole formed by an eccentric rotary plug, the coupling joint 20 is installed on the lower half section of the central hole, the centralizing pull rod is connected to the upper end of the coupling joint, the lower end of the coupling joint protrudes out of the central hole to be connected with the production casing, an external wire is formed in the centralizing pull rod, the upper end of the centralizing pull rod protrudes out of a central pipe, a pull rod nut 21 is installed, and the lower end face of the pull rod nut is blocked on the upper end face of the eccentric rotary plug.
The washing pipe is locked at the upper port of the eccentric hole through a washing pipe locking sleeve 42, and a washing pipe sealing sleeve 43 is sleeved on the outer wall of the washing pipe and enables the outer wall of the washing pipe to be in a sealing state with the inner wall of the eccentric hole of the eccentric rotary plug.
The lateral outlet of the casing head body is connected to a lateral outlet flat valve 32.
The lower slip assembly comprises a lower slip seat 12, a lower slip 13, a body support 14, a lower slip bolt 10 and a lower slip nut 11, wherein the lower slip is positioned in the lower slip seat, the lower slip is sleeved on the outer wall of the outer sleeve, the body support covers the outer portion of the lower slip seat, the lower slip bolt sequentially penetrates through the lower slip seat and the top surface of the body support and then is connected to the casing head body 30, and the lower slip nut is installed on the lower slip bolt.
The eccentric plug rotary sealing structure comprises a first annular groove formed in the inner wall of the casing head body and a first rotary sealing ring arranged in the first annular groove; the centralizer rotary sealing structure comprises a second annular groove formed in the inner wall of the eccentric rotary plug and a second rotary sealing ring arranged in the second annular groove; the outer sleeve static sealing structure arranged on the inner wall of the casing head body comprises a third annular groove formed in the inner wall of the casing head body and a static sealing ring arranged in the third annular groove.
In a word, the main structure of the invention is composed of four parts of a lower slip assembly 1, a production casing centralizer 2, a casing head shell assembly 3 and an eccentric rotary flushing mechanism 4. The lower slip assembly 1 consists of a lower slip bolt 10, a lower slip nut 11, a lower slip seat 12, a lower slip 13, a body bracket 14 and the like; the production casing centralizer 2 consists of a coupling joint 20, a centralizing pull rod 22, a pull rod nut 21 and the like; the casing head shell assembly 3 consists of a casing head body 30, an outer sleeve static seal structure 31, a side outlet flat valve 32, a centralizer rotary seal structure 33, an eccentric plug rotary seal structure 34, a pressure-bearing steel ball 35 and the like; the eccentric rotary flushing mechanism 4 consists of an eccentric rotary plug 40, a blowout preventer flange 41, a pipe washing locking sleeve 42, a pipe washing sealing sleeve 43, a compression nut 44, a compression bolt 45 and the like.
The working principle is as follows: the lower slips 13 in the lower slip assembly 1 hold the surface sleeve or the technical sleeve seat on the lower slip seat 12, and the lower slip bolts 10 and the lower slip nuts 11 are connected with the sleeve head shell assembly 3, so that the surface sleeve or the technical sleeve and the whole device form a whole; the body support 14 serves as an auxiliary support for the entire device.
The production casing centralizer 2 is connected with a production casing coupling through a coupling joint 20, and the production casing is straightened through a centralizing pull rod 21 and a pull rod nut 22, so that the concentricity of the production casing and a surface casing or a technical casing is ensured; while a seal is formed between the rotary seal 33 and the eccentric rotary flushing mechanism 4 by means of the centralizer.
The casing head shell assembly 3 seals the surface casing or the technical casing through the outer sleeve static sealing structure 31, the sealing is a nonmetallic static sealing structure, and the sealing mode can be injection sealing or non-injection sealing; sealing with the eccentric rotary plug 40 by the eccentric plug rotary seal 34; the side hole has 2 side outlet flat valves 32 to play a role in returning slurry, and the defect of insufficient slurry returning space when the washing pipe rotates to the side hole is effectively avoided.
The eccentric rotary flushing mechanism 4 is connected with the casing head casing assembly 3 through a compression nut 44 and a compression bolt 45, and the annular pressure born by the eccentric rotary plug 40 is transferred to the casing head casing assembly 3 through the compression blowout prevention flange 41, so that the eccentric rotary plug 40 is prevented from being shifted out due to the annular pressure; the eccentric rotary plug 40 and the casing head body 30 are provided with nitriding raceways, and the middle is contacted by the pressure-bearing steel balls 35, so that the sliding friction is changed into rolling friction, the friction coefficient is greatly reduced, and the rotary torque is reduced; the wash pipe locking sleeve 42 and the wash pipe sealing sleeve 43 lock and seal the wash pipe, ensure that the pressure outlet is only arranged on the side outlet of the casing head casing assembly 3, and are beneficial to the flushing and slurry returning effect.
The centralizer rotary sealing structure 33, the eccentric plug rotary sealing structure 34 and the outer sleeve static sealing structure 31 form a sealing structure of the device for sealing the sleeve annulus, and the sleeve annulus is sealed.
The eccentric rotary plug 40 has a radial lever screw hole in the upper portion.
The manual rotation and automatic rotation integrated device has the advantages that the manual rotation and automatic rotation integrated device can be connected with the extension bar, then the extension bar can be manually driven to rotate, meanwhile, the gear structure is machined on the outer circle of the upper portion of the extension bar, and the extension bar can be electrically or hydraulically driven to rotate after being connected with the gear mechanism.
In the description of the present invention, it should be understood that the direction or positional relationship of orientation is based on the direction or positional relationship shown in the drawings, and is merely for convenience of describing the present invention, and does not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the invention.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. The rotary sealing wellhead for the external flushing reinforcement of the oil-water well production casing comprises a lower slip assembly and a casing head shell assembly, and is characterized by further comprising a production casing centralizer and an eccentric rotary flushing mechanism, wherein the casing head shell assembly comprises a casing head body, at least two radially-through side outlets are formed in the middle of the casing head body, the lower end of the casing head body is connected with the lower slip assembly, the lower slip assembly is sleeved on the outer wall of the outer casing, the upper end of the outer casing stretches into the casing head body, an outer casing static sealing structure is arranged on the inner wall of the casing head body, and the inner wall of the casing head body and the outer wall of the outer casing are in a sealing state; the eccentric rotary flushing mechanism comprises an eccentric rotary plug, a washing pipe and a blowout prevention flange, wherein the eccentric rotary plug is provided with a central hole and an eccentric hole, the production casing centralizer is installed in the central hole, the lower end of the production casing centralizer is connected with the upper end of the production casing, the production casing is concentrically positioned in the outer casing, the washing pipe is inserted in the eccentric hole, the lower end of the washing pipe extends into an annulus between the outer casing and the production casing, the blowout prevention flange is connected with the casing head body through a compression bolt, a compression nut is installed on the compression bolt, the lower end face of the blowout prevention flange is pressed on the upper end face of the eccentric rotary plug, the lower half section of the eccentric rotary plug extends into the casing head body, the inner wall of the casing head body is provided with an eccentric plug rotary sealing structure, the inner wall of the casing head body and the outer wall of the eccentric rotary plug are in a sealing state, the inner wall of the eccentric rotary plug is provided with a centralizer rotary sealing structure, and the rotary sealing structure of the eccentric rotary sealing structure is in a sealing state between the inner wall of the eccentric rotary plug and the production casing centralizer; the eccentric rotary plug rotates relative to the casing head body and the production casing centralizer;
the upper end of the eccentric rotary plug is provided with an expanding edge, the lower end face of the expanding edge and the upper end face of the casing head body are provided with corresponding raceways, and pressure-bearing steel balls are placed in the raceways;
the lower end surface of the blowout prevention flange is pressed on the upper end surface of the eccentric rotary plug, hard alloy is sintered on the contact surface and ground to a higher finish degree, so that the free rotation of the eccentric rotary plug is not prevented;
the production casing centralizer comprises a coupling joint and a centralizing pull rod, wherein the centralizing pull rod is arranged at the upper half section of a central hole formed in the eccentric rotary plug, the coupling joint is arranged at the lower half section of the central hole, the upper end of the coupling joint is connected with the centralizing pull rod, the lower end of the coupling joint protrudes out of the central hole and is connected with the production casing, the centralizing pull rod is provided with an external wire, the upper end of the centralizing pull rod protrudes out of the central pipe, a pull rod nut is arranged, and the lower end face of the pull rod nut is blocked on the upper end face of the eccentric rotary plug;
the washing pipe is locked at the upper port of the eccentric hole through a washing pipe locking sleeve, a washing pipe sealing sleeve is sleeved on the outer wall of the washing pipe, and the outer wall of the washing pipe and the inner wall of the eccentric hole of the eccentric rotary plug are in a sealing state through the washing pipe sealing sleeve;
the upper part of the eccentric rotary piston is provided with a radial lever screw hole, the outer circle of the upper part is processed with a gear structure after being connected with the extension rod, and the gear structure is connected with the gear mechanism to drive the component to rotate by electric power or hydraulic power, so that the manual rotation and automatic rotation integration is realized.
2. The rotary seal wellhead for external flushing and strengthening of an oil-water well production casing according to claim 1, wherein a side outlet of the casing head body is connected with a side outlet flat valve.
3. The rotary seal wellhead for external flushing reinforcement of oil-water well production casings according to claim 1, wherein the lower slip assembly comprises a lower slip seat, a lower slip, a body support, a lower slip bolt and a lower slip nut, the lower slip is positioned in the lower slip seat, the lower slip is clamped on the outer wall of the outer casing, the body support is covered outside the lower slip seat, the lower slip bolt sequentially penetrates through the lower slip seat and the top surface of the body support and then is connected to the casing head body, and the lower slip nut is installed on the lower slip bolt.
4. The rotary seal wellhead for external flushing reinforcement of an oil-water well production casing according to claim 1, wherein the eccentric plug rotary seal structure comprises a first annular groove formed in the inner wall of the casing head body and a first rotary seal ring installed in the first annular groove; the centralizer rotary sealing structure comprises a second annular groove formed in the inner wall of the eccentric rotary plug and a second rotary sealing ring arranged in the second annular groove; the outer sleeve static sealing structure arranged on the inner wall of the casing head body comprises a third annular groove formed in the inner wall of the casing head body and a static sealing ring arranged in the third annular groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810445448.2A CN110469285B (en) | 2018-05-10 | 2018-05-10 | Rotary sealing wellhead for flushing and reinforcing outside oil-water well production casing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810445448.2A CN110469285B (en) | 2018-05-10 | 2018-05-10 | Rotary sealing wellhead for flushing and reinforcing outside oil-water well production casing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110469285A CN110469285A (en) | 2019-11-19 |
| CN110469285B true CN110469285B (en) | 2023-10-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810445448.2A Active CN110469285B (en) | 2018-05-10 | 2018-05-10 | Rotary sealing wellhead for flushing and reinforcing outside oil-water well production casing |
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| CN (1) | CN110469285B (en) |
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| CN2346925Y (en) * | 1998-03-06 | 1999-11-03 | 石斌 | Fully enclosed anti-theft light weight eccentric christmas tree wellhead assembly |
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| CN206903613U (en) * | 2017-07-14 | 2018-01-19 | 贾继广 | Well head ring set well-flushing controller |
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| CN207080195U (en) * | 2017-08-24 | 2018-03-09 | 大庆市中航石油机械制造有限公司 | A kind of inclined VI type decentralized wellhead |
| CN208441797U (en) * | 2018-05-10 | 2019-01-29 | 中国石油化工股份有限公司 | Reinforcing rotatory sealing well head is rinsed outside a kind of oil-water well production casing |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8196649B2 (en) * | 2006-11-28 | 2012-06-12 | T-3 Property Holdings, Inc. | Thru diverter wellhead with direct connecting downhole control |
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2018
- 2018-05-10 CN CN201810445448.2A patent/CN110469285B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2346925Y (en) * | 1998-03-06 | 1999-11-03 | 石斌 | Fully enclosed anti-theft light weight eccentric christmas tree wellhead assembly |
| CN203022664U (en) * | 2012-12-13 | 2013-06-26 | 贵州高峰石油机械股份有限公司 | Well mouth head feed device capable of synchronously completing operation of washing well mouth |
| CN206903613U (en) * | 2017-07-14 | 2018-01-19 | 贾继广 | Well head ring set well-flushing controller |
| CN207080195U (en) * | 2017-08-24 | 2018-03-09 | 大庆市中航石油机械制造有限公司 | A kind of inclined VI type decentralized wellhead |
| CN107701142A (en) * | 2017-10-21 | 2018-02-16 | 中国石油集团渤海钻探工程有限公司 | A kind of testing pressure of well head rotary sealing type casing blanking plug |
| CN208441797U (en) * | 2018-05-10 | 2019-01-29 | 中国石油化工股份有限公司 | Reinforcing rotatory sealing well head is rinsed outside a kind of oil-water well production casing |
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| Publication number | Publication date |
|---|---|
| CN110469285A (en) | 2019-11-19 |
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