CN107461160B - Arc-shaped flexible slip tooth long-life casing head - Google Patents
Arc-shaped flexible slip tooth long-life casing head Download PDFInfo
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- CN107461160B CN107461160B CN201710255659.5A CN201710255659A CN107461160B CN 107461160 B CN107461160 B CN 107461160B CN 201710255659 A CN201710255659 A CN 201710255659A CN 107461160 B CN107461160 B CN 107461160B
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- 238000007789 sealing Methods 0.000 claims abstract description 90
- 229910052751 metal Inorganic materials 0.000 claims abstract description 68
- 239000002184 metal Substances 0.000 claims abstract description 68
- 239000002131 composite material Substances 0.000 claims abstract description 12
- 229910001069 Ti alloy Inorganic materials 0.000 claims abstract description 7
- 239000004519 grease Substances 0.000 claims description 11
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 8
- 238000012545 processing Methods 0.000 claims description 8
- 239000000956 alloy Substances 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 4
- 229910019932 CrNiMo Inorganic materials 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 238000003754 machining Methods 0.000 claims description 3
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- 229910052717 sulfur Inorganic materials 0.000 claims description 2
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- 230000035939 shock Effects 0.000 claims 1
- 230000007797 corrosion Effects 0.000 abstract description 9
- 238000005260 corrosion Methods 0.000 abstract description 9
- 229910000851 Alloy steel Inorganic materials 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
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- 239000010410 layer Substances 0.000 description 9
- 230000035882 stress Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 5
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- 229920000459 Nitrile rubber Polymers 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229920006168 hydrated nitrile rubber Polymers 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 239000003921 oil Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
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- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/08—Casing joints
-
- 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
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/10—Slips; Spiders ; Catching devices
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
- Gasket Seals (AREA)
Abstract
The invention discloses an arc-shaped flexible slip tooth long-life casing head which comprises a bottom plate, an annular supporting plate, a manual flat valve, an anti-vibration pressure gauge, a WE-type arc-shaped flexible slip hanger assembly, a C-type composite sealing ring, a casing head body, an H-type metal sealing ring assembly, a lower arc-shaped flexible slip assembly, a sealing backing ring I, a stud bolt, a nut and a sealing backing ring II. Compared with the conventional straight tooth type slip teeth, the arc type flexible slip teeth have larger bearing capacity, so that the bearing capacity is larger, the stress on the outer surface of the sleeve is uniform, the sleeve is not bitten and damaged, the corrosion resistance of the titanium alloy slip teeth is nearly hundreds of times that of common alloy steel, the strength is increased, the weight of the hanger is lightened, the integral sealing structure of the sleeve head basically adopts a metal sealing ring structure, the high temperature resistance and the chemical corrosion resistance are stronger, the long service life of the slip hanger is ensured, the slip hanger is suitable for the combination of the conventional deep well and ultra-deep well wellhead sleeve head, and the application field of the slip hanger is expanded.
Description
Technical Field
The invention relates to the technical field of drilling, in particular to an arc-shaped flexible slip tooth long-life casing head for an ultra-deep high-pressure oil-gas well.
Background
Casing head is the necessary equipment for connecting casing and wellhead device in petroleum and natural gas drilling and production process. The working principle of the casing head is that the weight of the casing in the well is transmitted to the casing head base through the interaction of the casing head slips, the casing and the hanger, so that the casing head is fully loaded with the weight of the casing, and the casing head shell, the slip hanger, the slips and the casing are all loaded with larger acting forces, and the mechanical strength of all parts is required to meet the requirements.
At present, the casing head is usually split type and integral type, and is provided with a reverse slip type hanger or a mandrel type hanger, so that the split type casing head is inconvenient to install and wastes time and labor in the use process; the integral casing head has reasonable structure, saves materials, can simplify the installation procedure of the blowout preventer, and is easy to assemble. The reverse slip type hanger is easy to generate the phenomenon of weak cohesion in the use process, the sleeve can move up and down, the sealing performance and the safety reliability are poor, and the sleeve is easy to be damaged; the mandrel type hanger adopting the PT-CQ air seal buckle has the advantages that the sealing performance, the pressure resistance and the working reliability are improved compared with those of a reverse slip type casing head, but for hanging a surface casing with large pipe diameter and large pipe diameter, the mandrel type hanger is difficult to install in a limited space at the lower part of the casing head due to the limited structure, so that the mandrel type hanger is inconvenient to use. When the casing head is used for drilling oil, gas and water wells, the aims of controlling a fixed wellhead, supporting and fixing a casing string which is put into the well and installing a blowout preventer stack are fulfilled, so that the sealing of the casing head is important for construction safety, and particularly, the casing head can play a key role when blowout phenomena such as overflow, kick and the like occur in the well. The stress and the contact force of various conventional steel-grade sleeves are hung by the conventional 95/8 '-24' sleeve hanger assembly are analyzed, the fact that the sleeves are only suitable for shallow layers and do not meet 300 ton limit loads is found, the maximum contact force of the sleeves occurs at a slip notch, the maximum contact force of the slips and the slip hanger also occurs at the notch, the contact between slip teeth and the outer wall surface of the sleeve is uneven, and the main reason is that the slips tightly clamp the sleeves through circumferential shrinkage, so that the contact force of the slips and the sleeves is asymmetric. Because of the asymmetry of the slips, the stress distribution of the slips and the casing is extremely uneven, and the opposite stress value of the slips notch is maximum.
Thus, the main problems with current slips are: the casing head of the prior art is of a single-layer sealing structure, only the lower end of the slip hanger is provided with a BT sealing ring for sealing, under the condition that the pressure in a well is unstable, the sealing effect of the sealing ring can be influenced, the well blowout phenomenon of a wellhead is not beneficial to being controlled rapidly, the extrusion force of slip teeth on the casing is uneven, the casing strength is reduced and early failure is caused, the common alloy slip teeth are easy to rust and the teeth are stressed unevenly and are easy to damage under severe working condition environments, and frequent replacement is needed.
Disclosure of Invention
Aiming at the defects of the slip structure and the sealing structure, the invention designs a long-life casing head of an arc-shaped flexible slip tooth structure and a metal sealing pressure-bearing structure.
The technical scheme of the invention is as follows:
the invention relates to an arc-shaped flexible slip tooth long-life casing head, which consists of a bottom plate, a supporting backing ring I, an annular supporting plate, a supporting backing ring II, a grease injection one-way valve, a manual flat plate valve, a threaded flange, a plug, a right-angle stop valve, an anti-vibration pressure gauge, an instrument flange, a WE-type arc-shaped flexible slip hanger assembly, a jackscrew assembly, a screw I, a D-type composite sealing ring, a wedge-shaped metal sealing ring I, an inner hexagonal screw, a joint, a casing head body, a metal sealing ring assembly, a lower arc-shaped flexible slip tooth, a wedge-shaped metal sealing ring II, a slip housing, a screw II, a spring washer, a sealing backing ring I, a stud and a sealing backing ring II, wherein the upper part of the bottom plate is welded and fixed with the supporting backing ring, the annular supporting backing plate, the supporting backing ring II and the casing head body are sequentially connected above the manual flat plate, the middle part of the casing head body is provided with a transverse through hole pipeline, the grease injection one-way valve is arranged below the through hole pipeline of the casing head body, the middle part is provided with a threaded fastener, the side of the casing head body is provided with a threaded hole, the grease injection one-way valve and the casing head body are connected with threads by adopting threads, the flat plate body and the left-right-side symmetrical arrangement of the metal sealing ring assembly, the two flat plate heads are connected with the casing head body by the left-side of the sealing ring and the arc-shaped flexible slip tooth ring, the sealing ring is in a rectangular casing head body, the sealing ring F-shaped sealing ring F is matched with the sealing ring is matched with the square flange, the casing head body, the sealing ring is screwed into the casing head body, the square-shaped sealing ring is screwed into the casing head body, the casing head is connected by the casing head is by the casing pipe, and the casing pipe, the casing pipe has and the casing pipe has and the casing. The anti-seismic pressure gauge is connected in a threaded hole of the right-angle stop valve, the jackscrew assembly is installed in a threaded through hole machined in the radial direction of the casing head body, the sealing gasket ring II is installed in a pre-machined sealing groove of the upper end face of the casing head body, the joint is in threaded connection with the threaded flange end face at the left end of the casing head body, and the plug is welded on the threaded flange end face at the right side of the casing head body.
Further, the WE type flexible slip casing inner surface of WE type arc flexible slip hanger assembly is processed and has three-layer step, the outer surface processing of arc type flexible slip tooth has three-layer step to install by the step cooperation with WE type slip casing, the hexagon socket head cap screw circumferencial direction is arranged on WE type slip casing and the flexible slip tooth circumferencial direction of arc type, and fastening WE type slip casing and the flexible slip tooth of arc type, the processing of WE type slip casing up end circumferencial direction has the screw hole, is connected with the cooperation of support backing ring through screw three, metal washer, wedge metal seal ring I and wedge metal seal ring inlay in the wedge groove of the outer surface of the flexible slip tooth of arc type, the flexible slip tooth of WE type arc type flexible slip hanger assembly arc form is pressed to hexagon socket head cap screw, and the flexible slip hanger assembly of WE type arc type is installed on the hole sleeve pipe bell mouth of head body.
Further, the outer surface of the lower arc-shaped flexible slip tooth is processed with a double-layer step, the slip shell is processed with a double-layer step, the lower arc-shaped flexible slip tooth and the slip shell are installed in a matched mode through steps, threaded holes are processed in the circumferential direction of the lower end face of the slip shell, the lower arc-shaped flexible slip tooth is connected with a supporting backing ring II in a matched mode through screws and a spring washer, and a wedge-shaped metal sealing ring II is inlaid in a wedge-shaped groove of the outer surface of the lower arc-shaped flexible slip tooth.
Further, the metal seal ring assembly comprises a metal seal ring upper seat, an H-shaped metal seal ring and a metal seal ring lower seat, wherein the H-shaped metal seal ring is arranged between the metal seal ring upper seat and the metal seal ring lower seat and is in press fit, the metal seal ring upper seat and the metal seal ring lower seat are formed by 12Cr13 in a machining mode, and the H-shaped metal seal ring is made of 15 CrNiMo.
Further, the novel sealing structure is characterized in that the D-type composite sealing ring is formed by matching and injection molding of an O-type sealing ring and a C-type rubber ring, the C-type rubber ring is designed by improving the lip-type sealing ring structure, and can bear the bearing function in six directions in space.
Further, the lower arc-shaped flexible slip teeth are used for processing a cylindrical slip structure along the circumferential direction, then are longitudinally cut into block slips, are installed on the slip shell steps, are the same as the installation method of the common straight slip teeth, and are high in feasibility and convenient to popularize and apply.
Further, in the working process, the plug at the right end part of the casing head body is plugged, and the joint at the left end part of the casing head body can be connected with an external high-pressure pipeline.
The integral sealing part of the invention basically adopts a metal sealing structure, has few rubber sealing elements, is high-temperature resistant and corrosion resistant, prolongs the service life, and reduces the maintenance cost and labor intensity for replacing the rubber sealing element.
The beneficial effects of the invention are as follows:
1) The composite sealing structure of the metal sealing structure is used for replacing a rubber sealing element, so that the pressure bearing effect is ensured, the service life is prolonged, the replacement frequency is reduced, the sealing effect is excellent, a wedge-shaped metal sealing ring is designed between the slip shell and the slip teeth, and the relative abrasion of the contact surfaces of the slip shell and the slip teeth is reduced;
2) The upper sealing element is replaced by a D-shaped composite sealing ring, so that the multi-directional pressure bearing and sealing performance under the action of external load is ensured, the D-shaped composite sealing ring is made of HNBR hydrogenated nitrile rubber material, and the D-shaped composite sealing ring has higher strength, stronger oxidation resistance, ageing resistance, high temperature resistance and chemical acid-base corrosion resistance than the common rubber ring, and longer service life of a sealing structure;
3) The arc-shaped flexible slip teeth are adopted, compared with the conventional straight tooth type slip teeth, the bearing capacity is larger, so that the stress on the outer surface of the sleeve is uniform, the sleeve is hardly bitten and damaged, and the corrosion resistance of the titanium alloy slip teeth is nearly hundred times that of the common alloy steel;
4) The arc-shaped flexible slip teeth are made of titanium alloy materials, have stronger corrosion resistance and high temperature resistance and stronger elastic deformation, so that stress of the slip and the sleeve is uniformly distributed, the stress value of the step surface matched with the slip shell and the slip teeth is not excessively large, the contacted sleeve surface is not damaged, and the teeth of the slip and the sleeve are not damaged;
5) By adopting the slip teeth made of the titanium alloy material, the overall weight of the casing head is reduced, the labor intensity of hoisting and moving is further reduced, the processing and the assembly are easier, the practicability is strong, and the casing head is popularized and applied.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic diagram of a long life casing head of an arcuate flexible slip bowl;
FIG. 2a is a three-dimensional block diagram of the present invention;
FIG. 2b is a three-dimensional block diagram of the prior art;
FIG. 3a is a schematic view of the installation structure of a conventional straight teeth slip bowl;
FIG. 3b is a schematic view of the mounting structure of an arcuate flexible slip bowl;
FIG. 4 is a schematic diagram of an H-shaped metal seal ring assembly of an arcuate flexible slip bowl long life casing head;
FIG. 5 is a schematic illustration of two construction slip teeth installations of an arcuate flexible slip tooth long life casing head;
FIG. 6 is a schematic illustration of a WE type arcuate flexible slip hanger assembly with an arcuate flexible slip bowl long life casing head;
FIG. 7a is a schematic illustration of a change in force on slip bowl according to the present invention;
FIG. 7b is a schematic diagram of a prior art slip bowl force variation.
The figure shows:
1-bottom plate, 2-backing ring, 3-annular supporting plate, 4-grease injection hole, 5-grease injection one-way valve, 6-manual flat valve, 7-screw flange, 8-plug, 9-right angle stop valve, 10-anti-seismic pressure gauge, 11-instrument flange, 12-WE arc-shaped flexible slip hanger assembly, 13-jackscrew assembly, 14-screw I, 15-D-shaped composite sealing ring, 16-wedge-shaped metal sealing ring I, 17-socket head cap screw, 18-joint, 19-casing head body, 20-metal sealing ring assembly, 21-wedge-shaped metal sealing ring II, 22-lower arc-shaped flexible slip teeth, 23-slip shell,
a1, A2-screw spring washers,
a3-a gasket ring I,
a4, A5, A6, A7-stud bolts,
a8-a sealing gasket ring II,
121-WE-slip housing, 122-arcuate flexible slip bowl, 123-metal washer, 124-support backing ring, 125-screw,
151-O type sealing washer, 152-C type rubber circle.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the invention.
As shown in fig. 1 to 7, the long-life casing head of the arc-shaped flexible slip teeth is characterized by comprising a bottom plate 1, a supporting backing ring I2, an annular supporting plate 3, a supporting backing ring II 4, a grease injection one-way valve 5, a manual flat valve 6, a screw thread flange 7, a plug 8, a right-angle stop valve 9, an anti-vibration pressure gauge 10, an instrument flange 11, a WE-type arc-shaped flexible slip hanger assembly 12, a jackscrew assembly 13, a screw I14, a D-type composite sealing ring 15, a wedge-shaped metal sealing ring I16, an inner hexagon screw 17, a joint 18, a casing head 19, a metal sealing ring assembly 20, a lower arc-shaped flexible slip teeth 21, a wedge-shaped metal sealing ring II 22, a slip shell 23, screws, spring washers A1 and A2, a sealing backing ring IA 3, double-headed bolts, nuts A4, A5, A6 and A7 and a sealing backing ring IIA 8; the upper part of the bottom plate 1 is welded and fixed with a supporting backing ring 2 and used for supporting upper parts, the upper surface of an annular supporting plate 3 is in contact with a supporting backing ring II 4, a threaded screw thread is arranged on a grease injection one-way valve 5, a threaded hole is drilled on a casing head body 19, the grease injection one-way valve 5 is in threaded connection with the casing head body 19, two manual flat valves 6 are symmetrically arranged left and right on the casing head body 19, the manual flat valves 6 are oilfield standard PFF78-70 sulfur-resistant flat valves, the left and right parts of the casing head body 19 are fastened and connected with the casing head body 19 through screw thread flanges 7 by stud bolts, nuts A4 and A5, the sealing backing ring IA 3 is embedded in the annular groove of the manual flat valves 6 and the casing head body 19, a metal sealing ring assembly 20 is embedded in the rectangular groove of the casing head body 19, the casing head body 19 is provided with a rectangular groove matched with the metal sealing ring assembly 20, a right-angle stop valve 9 is in threaded connection with an instrument flange 11 through NPT taper pipe, the right-angle stop valve 10 is connected with the square-angle stop valve 9 through the threaded hole, the sealing ring assembly is arranged in the radial direction of the casing head body 19A 7, the end face of the casing head body is welded at the end face of the end face 8 in the radial direction of the casing head body 19, and the end face 8 is welded at the end face of the sealing ring 8 is provided with the end face of the sealing ring 8; the WE type flexible slip hanger assembly 12 is characterized in that three layers of steps are machined on the inner surface of a WE type slip housing 121, three layers of steps are machined on the outer surface of an arc type flexible slip tooth 122, the arc type flexible slip tooth 122 is formed by axially cutting four flaps and is symmetrically installed in a matched mode, the WE type flexible slip hanger assembly is matched with the WE type slip housing 121 in a matched mode, inner hexagonal screws 17 are circumferentially arranged on the WE type slip housing 121 and the arc type flexible slip tooth 122 in the circumferential direction, threaded holes are machined in the circumferential direction on the upper end surface of the WE type slip housing 121, a third screw 125 and a metal gasket 123 are matched and connected with a supporting cushion ring 124, a wedge-shaped metal sealing ring I16 and a wedge-shaped metal sealing ring 161 are embedded in wedge grooves on the outer surface of the arc type flexible slip tooth 122, the inner hexagonal screws 17 compress the WE type flexible slip hanger assembly 12, and the WE type flexible slip hanger assembly 12 are matched and installed on an inner hole conical surface machined in advance of a casing body 19; the outer surface of the lower arc-shaped flexible slip teeth 21 is provided with a double-layer step, the slip shell 23 is provided with a double-layer step, the lower arc-shaped flexible slip teeth 21 and the slip shell 23 are mounted by step fit, threaded holes are formed in the circumferential direction of the lower end surface of the slip shell 23, the lower arc-shaped flexible slip teeth are connected with a supporting backing ring II 4 in a fit manner through screws and spring washers A1 and A2, and a wedge-shaped metal sealing ring II 22 is embedded in a wedge-shaped groove on the outer surface of the lower arc-shaped flexible slip teeth 21; the metal seal ring assembly 20 consists of a metal seal ring upper seat 201, an H-shaped metal seal ring 202 and a metal seal ring lower seat 203, wherein the H-shaped metal seal ring 202 is arranged between the metal seal ring upper seat 201 and the metal seal ring lower seat 203 and is in compression fit, the metal seal ring upper seat 201 and the metal seal ring lower seat 203 are formed by 12Cr13 in a machining mode, and the H-shaped metal seal ring 202 is made of 15 CrNiMo;
as shown in fig. 3a and 3b, the D-type composite sealing ring 15 is formed by matching and injection molding an O-type sealing ring 151 and a C-type rubber ring 15, the C-type rubber ring 152 is designed by improving the lip-type sealing ring structure, and can bear the bearing function in six directions in space, and the D-type composite sealing ring 15 is made of HNBR hydrogenated nitrile rubber material, so that compared with the common rubber ring, the strength is higher, the oxidation resistance, aging resistance, high temperature resistance and chemical acid-base corrosion resistance are stronger, and the service life of the sealing structure is ensured to be longer; the lower arc-shaped flexible slip teeth 21 are used for processing a cylindrical slip structure along the circumferential direction, then are longitudinally cut into block slips, are installed on the steps of the slip shell 23, are the same as the installation method of the common straight slip teeth, and are high in feasibility and convenient to popularize and apply.
In the working process, the plug 8 at the right end part of the casing head body 19 is plugged, and the joint at the left end part of the casing head body 19 can be connected with an external high-pressure pipeline; the whole sealing part of the casing head basically adopts a metal sealing structure, and has few rubber sealing elements, high temperature resistance, corrosion resistance, prolonged service life and reduced maintenance cost and labor intensity for replacing the rubber sealing element; fig. 7 shows that the straight thread tooth slips and the arc flexible slips of the patent are compared with each other under the action of stress, the straight thread tooth slips are found to have huge local influence on the sleeve, the stress distribution is uneven, the upper end and the lower end are large, the middle is small, the influence of the arc flexible thread tooth slips on the sleeve is small, and the stress distribution is even.
The arc-shaped flexible slip tooth long-life casing head provided by the invention is made of titanium alloy materials, has larger bearing capacity compared with the conventional straight tooth type slip tooth, and ensures that the outer surface of the casing is stressed uniformly, so that the biting damage to the casing is hardly caused, the corrosion resistance of the titanium alloy slip tooth is nearly hundred times that of the conventional alloy steel, the sealing structure basically adopts a metal sealing ring structure, the long life of the slip hanger is ensured, the long-life casing head is suitable for the combination of the conventional deep well and ultra-deep well wellhead casing head, and the application field of the slip hanger is expanded.
The present invention is not limited to the above-mentioned embodiments, but is intended to be limited to the following embodiments, and any modifications, equivalents and modifications can be made to the above-mentioned embodiments without departing from the scope of the invention.
Claims (4)
1. The utility model provides an arc-shaped flexible slip tooth long-life casing head which is characterized in that comprises bottom plate (1), support backing ring I (2), annular backing plate (3), support backing ring II (4), annotate fat check valve (5), manual flat valve (6), screw flange (7), end cap (8), right angle stop valve (9), antidetonation manometer (10), instrument flange (11), WE formula arc-shaped flexible slip hanger assembly (12), jackscrew assembly (13), screw one (14), D composite seal circle (15), wedge metal seal ring I (16), hexagon socket head cap screw (17), joint (18), casing head body (19), metal seal circle assembly (20), lower part arc-shaped flexible slip tooth (21), wedge metal seal ring II (22), slip casing (23), screw two, spring washers (A1, A2), seal backing ring I (A3), stud (A4, A5, A6, A7), seal backing ring II (A8), the upper portion and support backing ring (2) of bottom plate (1) are fixed, support backing ring (2) are connected with annular backing ring (19) in proper order, casing head body (19) are equipped with the casing head middle part of casing head (19), the grease injection check valve (5) is arranged on the inner side below a through hole pipeline of the casing head body (19), a threaded screw thread is arranged in the middle of the grease injection check valve, the casing head body (19) is provided with a threaded hole, the grease injection check valve (5) is in threaded connection with the casing head body (19), the casing head body (19) is provided with two manual flat valves (6) which are symmetrically arranged left and right, the manual flat valves (6) are oilfield standard PFF78-70 sulfur-resistant flat valves, the left and right parts of the casing head body (19) are respectively connected with the manual flat valves (6) through screw thread flanges (7) and the casing head body (19) through stud bolts, nuts (A4 and A5) in a fastening mode, a sealing gasket ring I (A3) is embedded in an annular groove of the manual flat valves (6) and the casing head body (19), a metal sealing ring assembly (20) is embedded in a rectangular groove of the casing head body (19), an inner ring of the casing head body (19) is provided with a rectangular groove matched with the metal sealing ring assembly (20), the shock-resistant pressure gauge (10), the right-angle stop valve (9) and the meter (11) are connected with the casing head body (19) through the threaded hole (9) in a radial direction, the sealing groove II is processed in the casing head body (19) through the threaded hole, the joint (18) is in threaded connection with the end face of a threaded flange (7) at the left end of a casing head body (19), a plug (8) is welded on the end face of the threaded flange (7) at the right end of the casing head body (19), three layers of steps are processed on the inner surface of a WE-type slip housing (121) of a WE-type flexible slip hanger assembly (12), three layers of steps are processed on the outer surface of an arc-type flexible slip tooth (122) and are matched with the WE-type slip housing (121) through the steps, an inner hexagon screw (17) is circumferentially arranged on the WE-type slip housing (121) and the arc-type flexible slip tooth (122), threaded holes are processed on the circumferential direction of the upper end face of the WE-type slip housing (121), the WE-type flexible slip housing (121) is matched and connected with a supporting backing ring (124) through a screw III (125), a wedge-shaped metal sealing ring I (16) and a wedge-shaped metal sealing ring (161) are inlaid in a wedge groove on the outer surface of the arc-type flexible slip tooth (122), the inner hexagon screw (17) is circumferentially arranged on the circumferential direction of the WE-type flexible slip housing (121) and the arc-type flexible slip hanger assembly (122), the WE-type flexible slip hanger is tightly pressed by a titanium alloy, the alloy is well-type flexible alloy roll bowl (12 is arranged on the arc-type flexible slip hanger assembly, the arc-type flexible bowl (12 is well, reach flexible slips tooth effect, lower part arc flexible slips tooth (21) surface processing has the bilayer step, and slips casing (23) processing has the bilayer step, and lower part arc flexible slips tooth (21) are installed by the step cooperation with slips casing (23), and the terminal surface circumferencial direction processing has the screw hole under slips casing (23), through screw, spring washer (A1, A2), is connected with support backing ring II (4) cooperation, and wedge metal seal ring II (22) are inlayed in the wedge inslot of the surface of lower part arc flexible slips tooth (21).
2. The long-life casing head of the arc-shaped flexible slip bowl according to claim 1, wherein the metal seal ring assembly (20) is composed of a metal seal ring upper seat (201), an H-shaped metal seal ring (202) and a metal seal ring lower seat (203), the H-shaped metal seal ring (202) is arranged between the metal seal ring upper seat (201) and the metal seal ring lower seat (203) and is in press fit, the metal seal ring upper seat (201) and the metal seal ring lower seat (203) are formed by machining 12Cr13, and the H-shaped metal seal ring (202) is made of 15 CrNiMo.
3. The long-life casing head of the arc-shaped flexible slip teeth according to claim 1, wherein the lower arc-shaped flexible slip teeth (21) are processed into a cylindrical slip structure along the circumferential direction, then are longitudinally cut into block slips, are installed on steps of a slip shell (23), are the same as the installation method of common straight slip teeth, have strong practicability and are convenient to popularize and apply.
4. The long-life casing head of the arc-shaped flexible slip teeth according to claim 1, wherein in the working process, a plug (8) at the right end part of the casing head body (19) is plugged, and a joint at the left end part of the casing head body (19) is connected with an external high-pressure pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710255659.5A CN107461160B (en) | 2017-04-19 | 2017-04-19 | Arc-shaped flexible slip tooth long-life casing head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710255659.5A CN107461160B (en) | 2017-04-19 | 2017-04-19 | Arc-shaped flexible slip tooth long-life casing head |
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| CN107461160A CN107461160A (en) | 2017-12-12 |
| CN107461160B true CN107461160B (en) | 2023-05-09 |
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| CN201710255659.5A Active CN107461160B (en) | 2017-04-19 | 2017-04-19 | Arc-shaped flexible slip tooth long-life casing head |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110761731A (en) * | 2019-11-19 | 2020-02-07 | 威飞海洋装备制造有限公司 | Slip hanger capable of realizing automatic or manual independent excitation |
| CN111963076A (en) * | 2020-08-05 | 2020-11-20 | 中国石油天然气集团有限公司 | Air-tight screw-connected pipe joint |
| CN114293973B (en) * | 2021-12-31 | 2024-03-12 | 杰瑞能源服务有限公司 | Logging tool string and manufacturing process thereof |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4913469A (en) * | 1988-08-08 | 1990-04-03 | Cameron Iron Works Usa, Inc. | Wellhead slip and seal assembly |
| US6412554B1 (en) * | 2000-03-14 | 2002-07-02 | Weatherford/Lamb, Inc. | Wellbore circulation system |
| US6644401B1 (en) * | 2001-10-26 | 2003-11-11 | Kvaerner Oilfield Products, Inc. | Slip type casing hanger with integral high pressure isolation plate |
| US6892810B2 (en) * | 2003-03-25 | 2005-05-17 | Halliburton Energy Services, Inc. | Gripper block for coiled tubing injector with variable tubing size capability |
| CN200958383Y (en) * | 2006-09-11 | 2007-10-10 | 建湖县鸿达阀门管件有限公司 | Double-slips metal integrated sealed sleeved pipe head |
| CN200955371Y (en) * | 2006-09-11 | 2007-10-03 | 建湖县鸿达阀门管件有限公司 | Sleeve-pipe head positive-negative chuck-tile hanger |
| US8573312B2 (en) * | 2010-12-23 | 2013-11-05 | Tesco Corporation | Apparatus for applying an axial force to well pipe slips |
| CN202300275U (en) * | 2011-08-22 | 2012-07-04 | 重庆新泰机械有限责任公司 | Metal sealing structure of well mouth |
| US9260926B2 (en) * | 2012-05-03 | 2016-02-16 | Weatherford Technology Holdings, Llc | Seal stem |
| CN203420656U (en) * | 2013-08-06 | 2014-02-05 | 盐城市鑫源石化机械有限公司 | Hydraulic flexible slip hanger |
| CN105275423B (en) * | 2014-06-15 | 2017-11-14 | 江苏宏泰石化机械有限公司 | It is a kind of can scene change hanger single-stage casing head |
| US10206729B2 (en) * | 2014-12-30 | 2019-02-19 | Kinamed, Inc. | Self-locking cable gripper |
| CN204827330U (en) * | 2015-08-06 | 2015-12-02 | 江苏宏泰石化机械有限公司 | Practical doublestage slips suspension type casing head |
| CN205477497U (en) * | 2016-03-21 | 2016-08-17 | 四川华宇石油钻采装备有限公司 | Well head open type sealing ring seat circle |
| CN106321007B (en) * | 2016-08-31 | 2020-07-17 | 四川宝石机械钻采设备有限责任公司 | WE-type slip-type casing hanger with double U-shaped sealing ring structure |
| CN106522859A (en) * | 2016-12-29 | 2017-03-22 | 江苏省无锡探矿机械总厂有限公司 | Arc-shaped slip |
| CN206655664U (en) * | 2017-04-19 | 2017-11-21 | 西南石油大学 | A kind of arc form flexibility slip insert long-life casing head |
-
2017
- 2017-04-19 CN CN201710255659.5A patent/CN107461160B/en active Active
Non-Patent Citations (1)
| Title |
|---|
| 钟功祥 ; 张天津 ; 肖力彤 ; 李蓓蓓 ; 吴臣德 ; .采油(气)井口装置现状及发展趋势.机电产品开发与创新.2007,(第06期),70-71+74页. * |
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