CN218598183U

CN218598183U - Metal sealing two-stage casing head adopting self-locking hanger

Info

Publication number: CN218598183U
Application number: CN202222663550.4U
Authority: CN
Inventors: 姜金维; 朱春雨; 周健; 张辉; 陈长青; 石星星; 杨培建; 张庭高
Original assignee: JIANGSU HONGTAI PETROCHEMICAL MACHINERY CO Ltd
Current assignee: JIANGSU HONGTAI PETROCHEMICAL MACHINERY CO Ltd
Priority date: 2022-09-29
Filing date: 2022-09-29
Publication date: 2023-03-10
Anticipated expiration: 2032-09-29

Abstract

A metal sealing two-stage casing head adopting a self-locking hanger is characterized in that the casing hangers with self-locking mechanisms are arranged above the central holes of a four-way joint of a lower casing head and an upper casing head, and an elastic sealing ring and a sealing assembly with a rectangular sealing ring are arranged on a cylinder body at the middle lower part of the lower casing hanger; an elastic sealing ring and a metal sealing assembly with three layers of inner and outer sealing lines are arranged on a cylinder body at the middle lower part of the upper casing hanger; the wing valves used on two sides of the four-way of the double-layer casing head all adopt manual non-rising stem flat valves which are formed by combining a flashboard and a valve rod nut in a split mode and are provided with elastic sealing ring sand prevention plates; in the pressure measuring assembly used, a stop buffer valve member is integrally connected to the meter stop valve and the pressure gauge buffer. Therefore, the trouble of compressing and fixing the oil pipe hanger by using a plurality of locking screws and the matched sealing assembly is avoided, and the oil pipe hanger has the characteristics of light weight, good sealing performance, more labor-saving operation, more advanced performance, low cost and price and the like.

Description

Metal sealing two-stage casing head adopting self-locking hanger

Technical Field

The utility model relates to a casing head in oil, natural gas drilling equipment.

Background

The majority of casing heads in the existing oil and gas drilling and production equipment adopt a mandrel type casing hanger; the mandrel type casing hanger is arranged above a central stepped hole of the casing head four-way joint and is pressed and fixed by locking screws with sealing components which are uniformly distributed on the periphery of a flange on the casing head four-way joint; the problems of large number of parts, large and bulky products, multiple leakage links, high production cost, high selling price and the like exist. In addition, the instrument stop valve and the pressure gauge buffer used by the casing head are respectively independent and combined parts, so that the problems of large volume, easy leakage, easy damage by collision, high price and the like of the combined parts exist; the used open-stem or non-open-stem flat valves have the problems of large volume, complex structure, labor-consuming operation, high price, easy sand blockage and the like. The double-stage casing head has a large number of parts, so that the existing problems are amplified, and the work and economic burden of a user are increased.

Disclosure of Invention

The utility model aims at designing a synthesize and adopt novel "from locking casing hanger, metal seal assembly, manual dark pole wafer valve and the doublestage casing head of ending buffer valve part" to further improve the comprehensive properties of this product, alleviate user's work and economic burden.

The utility model is composed of a base, a two-layer casing head four-way joint, casing hangers with two specifications, a cover plate flange above the casing hanger, wing valves on two sides, a threaded instrument flange, a pressure measuring assembly, a threaded flange, a pipe plug, a matched sealing element and a threaded connecting piece; the difference is that: the upper parts of the central holes of the four-way joint of the sleeve head on the lower layer and the upper layer are both provided with sleeve hangers with self-provided locking mechanisms, and an elastic sealing ring and a sealing assembly with a rectangular sealing ring are arranged on a cylinder body at the middle lower part of the sleeve hanger on the lower layer; an elastic sealing ring and a metal sealing assembly with three layers of inner and outer sealing lines are arranged on a cylinder body at the middle lower part of the upper casing hanger; the wing valves used on two sides of the four-way of the double-layer casing head all adopt manual non-rising stem flat valves which are formed by combining a flashboard and a valve rod nut in a split mode and are provided with elastic sealing ring sand prevention plates; in the pressure measuring assembly used, a stop buffer valve member is integrally connected to the meter stop valve and the pressure gauge buffer.

Because the utility model discloses in the centre bore of double-deck casing head cross, all install from the casing hanger of taking locking mechanism, consequently just saved in the casing head cross numerous locking screws that are used for compressing tightly fixed casing hanger and the supporting seal assembly of equipartition on the upper flange periphery, and then avoided increasing the thickness of casing head cross upper flange, avoided the leakage of numerous locking screw sealed departments, avoided the consumption of steel and energy, the rise of cost and price. The metal sealing assembly with three layers of inner and outer sealing lines is arranged on the cylinder body at the middle lower part of the upper casing hanger part, and has better sealing performance compared with the existing metal sealing assembly with one or two sealing lines. The wing valves used on two sides of the four-way of the double-layer casing head are all manual non-rising stem flat valves which are formed by combining flashboards and valve stems and nuts in a split mode and are provided with elastic sealing ring sand prevention plates, and the double-layer casing head four-way valve has the advantages of small operation resistance and good sand prevention performance. In the pressure measuring assembly, the stop buffer valve component is formed by connecting the instrument stop valve and the pressure gauge buffer into a whole, and has the advantages of small volume, complete functions, low price and the like; finally, the overall quality and performance of the double-stage casing head are increased again, and the production cost and the selling price are further reduced.

Drawings

Fig. 1 is a schematic view of the general structure and a central part of the present invention in partial section;

FIG. 2 is an enlarged schematic view of the lower casing hanger of the present invention in a full sectional view;

FIG. 3 is an enlarged schematic view of the upper casing hanger part of the present invention in full section;

FIG. 4 is an enlarged schematic view of a full-section rotary structure of a wing valve component according to the present invention;

FIG. 5 is a schematic side elevation view of the valve stem, stem nut, gate, valve seat and resilient sand control plate assembly within the valve member of FIG. 4;

fig. 6 is an enlarged schematic view of a stop buffer valve assembly according to the present invention in a full-sectional view.

The part names indicated by reference numerals in the drawings are as follows:

1. a base, 2, a lower-layer casing head four-way joint, 3, a lower-layer casing hanger, 3-1, a casing hanger, 3-2, a driving nut, 3-3, an annular wedge block, 3-4, a spring ring, 3-5, an elastic sealing ring, 3-6, a rectangular sealing ring, 3-7, a supporting ring, 3-8, a round nut, 3-9, a set screw, 4, a wing valve, 4-1, a valve body, 4-2, a valve rod, 4-3, a valve rod nut, 4-4, a flashboard, 4-5, a valve seat, 4-6, a sand prevention plate, 4-7, an elastic sealing ring, 5, a threaded instrument flange, 6, a double male joint, 7, a stop buffer valve, 7-1, a valve body, 7-2, a meter joint, 7-3 and a valve rod nut, 7-4 parts of valve rod, 7-5 parts of hand wheel, 7-6 parts of pressure relief screw, 8 parts of upper casing head four-way joint, 9 parts of pressure gauge, 10 parts of upper casing hanger, 10-1 parts of casing hanger, 10-2 parts of drive nut, 10-3 parts of annular wedge block, 10-4 parts of spring ring, 10-5 parts of elastic sealing ring, 10-6 parts of metal sealing ring, 10-7 parts of support ring, 10-8 parts of round nut, 10-9 parts of set screw, 11 parts of grease injection valve, 12 parts of cover plate flange, 13 parts of BT sealing ring, 14 parts of sealing gasket ring, 15 parts of stud nut, 16 parts of pressure relief valve, 17 parts of small stud nut, 18 parts of small sealing gasket ring, 19 parts of thread type flange, 20 parts of pipe plug.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings:

in fig. 1, the present invention is divided into an upper stage and a lower stage. The lower casing head consists of a base 1, a lower casing head four-way joint 2, a lower casing hanger 3, wing valves 4 arranged on two sides of the lower casing head hanger, a threaded instrument flange 5, a pressure measuring assembly, a threaded flange 19, a pipe plug 20, a sealing piece and a threaded connecting piece which are matched with each other for use, and can be independently used as a single-stage casing head. And an upper-layer casing head four-way joint 8, an upper-layer casing hanger 10, a cover plate flange 12, wing valves 4 on two sides of the cover plate flange, a threaded instrument flange 5, a pressure measuring assembly, a threaded flange 19, a pipe plug 20, a sealing piece and a threaded connecting piece which are matched with each other are arranged above the lower-layer casing head, so that a double-stage casing head product is formed.

The utility model discloses a lower floor's casing head cross 2's below, the welding is on base 1, installs on the cement basis of well head. The lower casing head cross joint 2 and the upper casing head cross joint 8, and the upper casing head cross joint 8 and the cover plate flange 12 are connected together by flanges, sealing backing rings 14 with different sizes and stud nuts 15. The left side and the right side of the lower layer sleeve head four-way joint 2 and the upper layer sleeve head four-way joint 8 are connected with a wing valve 4, a threaded instrument flange 5, a threaded flange 19 and a pipe plug 20 by using a small screw column nut 17 and a small sealing gasket ring 18; and pressure measuring assemblies are arranged above the threaded instrument flange 5 and used for measuring the pressure between the sleeves. A mandrel type lower casing hanger 3 and an upper casing hanger 10 are respectively arranged in central holes above a lower casing head four-way 2 and an upper casing head four-way 8, and grooves with thickness larger than or equal to that of the annular wedge blocks 3-3 and 10-3 are cut at positions corresponding to the annular wedge blocks 3-3 and 10-3 in the hangers and are matched and locked with the grooves. Above the upper casing head four-way 8 and the upper casing hanger 10, a cover plate flange 12 can be installed according to the requirements of customers, so as to prevent the environment pollution caused by the fact that a wellhead device is not installed immediately above the casing head after the drilling is finished. Two rectangular grooves are cut below the central holes of the upper-layer sleeve head four-way joint 8 and the cover plate flange 12, and BT sealing rings 13 are arranged in the rectangular grooves; four horizontal stepped holes which are symmetrical up and down and are provided with threads at the inlet ends and communicated with the rectangular grooves in the central hole are drilled on the circumferential edges of the flanges, and a grease injection valve 11 and a pressure release valve 16 are respectively arranged at the orifices and are used for injecting grease to extrude a BT sealing ring 13 so as to seal the extension necks of the lower-layer casing hanger 3 and the upper-layer casing hanger 10, so that the pressure resistance and the corrosion resistance of the product are improved.

In fig. 2 and 3, the lower casing hanger 3 of the present invention is composed of a casing hanger 3-1, a driving nut 3-2, an annular wedge 3-3, a spring ring 3-4, an elastic seal ring 3-5, a rectangular seal ring 3-6, a support ring 3-7, a round nut 3-8 and a set screw 3-9. The upper casing hanger 10 of the utility model is composed of a casing hanger 10-1, a driving nut 10-2, an annular wedge block 10-3, a spring ring 10-4, an elastic sealing ring 10-5, a metal sealing ring 10-6, a support ring 10-7, a round nut 10-8 and a set screw 10-9.

In the lower casing hanger 3 and the upper casing hanger 10 of the utility model, the casing hangers 3-1 and 10-1 are hollow cylindrical parts with thick middle part and thin two ends, the center of the cylindrical part is a through step hole, and the two ends of the step hole are both processed into taper pipe threads; the studs and the grooves at the upper part of the lock body are respectively provided with a locking mechanism consisting of driving nuts 3-2 and 10-2, annular wedges 3-3 and 10-3 and spring rings 3-4 and 10-4. An elastic sealing ring 3-5 and a sealing assembly consisting of a rectangular sealing ring 3-6, a support ring 3-7, a round nut 3-8 and a set screw 3-9 are arranged on a cylinder and a screw cylinder at the lower part in the lower casing hanger 3; an elastic sealing ring 10-5 and a metal sealing assembly with three layers of inner and outer sealing lines are arranged on a cylinder and a screw cylinder at the middle lower part of the upper casing hanger 10; the metal seal assembly with three layers of inner and outer seal lines consists of three layers of superposed metal seal rings 10-6 with splayed cross sections, a support ring 10-7 with a trapezoidal cross section above, a round nut 10-8 and a set screw 10-9; the annular space below the lower casing hanger 3 and the upper casing hanger 10 is sealed under the weight of the suspended casing.

In the lower casing hanger 3 and the upper casing hanger 10 of the present invention, the peripheries of the drive nuts 3-2 and 10-2 are smooth cylinders, the middle is a threaded through hole, 4-6 symmetrical axial grooves are processed at the upper end, and a large chamfer is processed at the lower end. The annular wedge blocks 3-3 and 10-3 are annular assemblies of which the outer diameters are less than or equal to the maximum diameters of the casing hangers 3-1 and 10-1 after being combined; the upper and lower sides of the annular wedge block are planes, chamfers with the angle less than or equal to 30 degrees are processed at the edges of the annular wedge block, a groove is cut in the middle of the outer circumference of the annular wedge block, and most of the central hole of the annular wedge block is processed into a large chamfer with an upward opening and wedged with the lower ends of the driving nuts 3-2 and 10-2; the annular wedges 3-3 and 10-3 are symmetrically cut into 4-6 pieces and are bound together by spring rings 3-4 and 10-4 in grooves in the middle of the outer circumference of the annular wedges.

In fig. 4 and 5, the wing valve 4 used in the present invention is a new type of manual non-rising stem flat valve; in a cylindrical blind hole valve cavity of a valve body 4-1, a screw rod at the lower end of a valve rod 4-2 penetrates through an inverted T-shaped valve rod nut 4-3, an inverted T-shaped groove above a gate plate 4-4 and a cylindrical blind hole to drive the valve to open and close; a pair of sand control plates 4-6 which are filled in the valve cavities at the two sides of the gate plate 4-4 and are provided with elastic sealing rings 4-7 are symmetrically arranged below the valve seats 4-5. The sand control plate 4-6 in the wing valve 4 is a square thick steel plate with a plane at one side and an arc surface at one side, an arc notch is arranged on the steel plate, and a large chamfer is processed at the junction of the lower surface of the steel plate and the arc surface; a through hole with a small diameter is drilled on the vertical bisector of the planes and the arc surfaces at the two sides of the sand control plate 4-6 and close to the circular-arc notch on the upper surface; a square groove with four arc angles is symmetrically processed on the arc surface of the sand control plate 4-6, an elastic sealing ring 4-7 is arranged in the square groove, and after the square groove is contacted with the wall of the valve cavity of the valve body 4-1, an elastic force for pushing the sand control plate 4-6 to be tightly attached to the flashboard 4-4 can be generated.

In fig. 6, the pressure measuring assembly of the present invention comprises a double male connector 6, a stop buffer valve 7 and a pressure gauge 9. The stop buffer valve 7 is an integral part which connects a common instrument stop valve and a pressure gauge buffer. The component is formed by combining six parts, namely a valve body 7-1, a meter connector 7-2, a valve rod nut 7-3, a valve rod 7-4, a hand wheel 7-5 and a pressure relief screw 7-6, and a matched sealing element and a thread connecting piece. The valve body 7-1 of the stop buffer valve 7 is L-shaped, the main body part is a square column body or a cylinder body, a threaded hole is processed at the central part of the lower end, and the upper end is connected with the meter connector 7-2 by a hollow screw column body and a cylinder body which are extended out and two elastic sealing rings carried by the cylinder body; the convex end on one side is cylindrical, and a valve rod nut 7-3, a valve rod 7-4, a sealing washer and a small elastic sealing ring are arranged in a larger threaded hole with a step in the center of the convex end; a pressure relief screw 7-6 is arranged in a smaller threaded hole at the other side corresponding to the protruding end; the outer end of the valve rod 7-4 is fixed with a hand wheel 7-5 by a flat washer and a nut. In the valve body 7-1, the cylindrical deep hole at the upper end, the threaded hole at the lower end, the threaded hole with the step with the larger protruding end and the threaded hole with the smaller other side are communicated with each other by the hole with the small diameter. The valve rod 7-4 is matched with a small-diameter hole communicated with a threaded hole at the lower end of the valve body 7-1, and has the function of a stop valve; the tiny diameter hole in the valve body 7-1 has a buffering function after twice turning and expansion of the threaded hole with the step and the cylindrical deep hole, so that the pressure gauge 9 is protected.

The utility model discloses the used elastic seal circle 3-5, 10-5 of lower floor casing hanger 3, upper casing hanger 10, the used elastic seal circle 4-7 in the wing valve 4 and the used elastic seal circle in ending buffer valve 7, the outside of its cross section is bellied circular arc limit, and the interior limit has a semicircular groove, and all the other both sides are the straight line limit that is parallel to each other. All the elastic sealing rings and the rectangular sealing rings 3-6 are made of FKM fluororubber or HNBR high saturated hydrogenated nitrile rubber to deal with high pressure and corrosive gas.

When the lower casing hanger 3 and the upper casing hanger 10 are installed, the annular wedge blocks 3-3 and 10-3 are reduced to be within the maximum diameter of the casing hangers 3-1 and 10-1 under the action of the spring rings 3-4 and 10-4 by using a sleeve wrench to rotate and drive the screw caps 3-2 and 10-2 to move upwards; conical pipe threaded holes at the upper end and the lower end of the central hole of the casing hangers 3-1 and 10-1 are respectively connected with a suspender and a casing put in a well; with the help of the suspender, the casing head cross joint is placed in the central step holes of the lower-layer casing head cross joint 2 and the upper-layer casing head cross joint 8; sealing components and metal sealing components below the casing hangers 3-1 and 10-1 are set under the gravity action of the suspended casings; then the sleeve spanner and the driving nuts 3-2 and 10-2 are rotated to move downwards, and the annular wedge blocks 3-3 and 10-3 are pushed to be wedged into grooves corresponding to the central holes of the lower-layer casing hanger 3 and the upper-layer casing hanger 10 for locking; then the hanger rod and the socket wrench are removed, and the installation work of other parts can be carried out. When the casing hanger needs to be disassembled, the annular wedge blocks 3-3 and 10-3 are retracted into the maximum diameter of the casing hangers 3-1 and 10-1 only by rotating the driving nuts 3-2 and 10-2 by using a casing wrench to move upwards, and then the annular wedge blocks can be taken out by adopting the hanging rod.

Claims

1. A metal sealing two-stage casing head adopting a self-locking hanger is formed by combining a base, a two-layer casing head four-way joint, casing hangers of two specifications, a cover plate flange above the casing hangers, wing valves on two sides, threaded instrument flanges, a pressure measuring assembly, threaded flanges, a pipe plug, a matched sealing piece and a threaded connecting piece; the method is characterized in that: the upper parts of the central holes of the four-way joint of the sleeve head on the lower layer and the upper layer are both provided with sleeve hangers with self-provided locking mechanisms, and an elastic sealing ring and a sealing assembly with a rectangular sealing ring are arranged on a cylinder body at the middle lower part of the sleeve hanger on the lower layer; an elastic sealing ring and a metal sealing assembly with three layers of inner and outer sealing lines are arranged on a cylinder body at the middle lower part of the upper casing hanger; the wing valves used on two sides of the four-way of the double-layer casing head all adopt manual non-rising stem flat valves which are formed by combining a flashboard and a valve rod nut in a split mode and are provided with elastic sealing ring sand prevention boards; in the pressure measuring assembly used, a stop buffer valve member is integrally connected to the meter stop valve and the pressure gauge buffer.

2. The metal-sealing dual-stage casing head with self-locking hanger of claim 1, wherein: in the lower layer casing hanger and the upper layer casing hanger, the casing hangers are hollow cylindrical parts with thick middle parts and thin two ends, the centers of the cylindrical parts are communicated step holes, and the two ends of the step holes are processed into taper pipe threads; and locking mechanisms consisting of a driving nut, an annular wedge block and a spring ring are arranged at the studs and the grooves at the upper part of the lock body.

3. The metal-sealing dual-stage casing head with self-locking hanger of claim 1, wherein: the metal sealing assembly with three layers of inner and outer sealing lines consists of three layers of superposed metal sealing rings with splayed cross sections, support ring with trapezoidal cross section in the upper part, circular nut and set screw.

4. The metal sealing dual stage casing head with self-locking hanger of claim 2, wherein: in the lower casing hanger and the upper casing hanger, the periphery of a driving nut is a smooth cylinder, the middle of the driving nut is a threaded through hole, 4-6 symmetrical axial grooves are processed at the upper end of the driving nut, and a large chamfer is processed at the lower end of the driving nut; the annular wedge blocks are annular assemblies, and after being combined, the outer diameter of each annular wedge block is smaller than or equal to the maximum diameter of the casing hanger; the upper and lower parts of the annular wedge block are planes, chamfers with the angle of less than or equal to 30 degrees are processed at the edges of the annular wedge block, a groove is cut in the middle of the outer circumference of the annular wedge block, and most of the central hole of the annular wedge block is processed into a large chamfer with an upward opening and wedged with the lower end of the driving nut; the ring-shaped wedge blocks are symmetrically cut into 4-6 blocks and are bound together by a spring ring in a groove in the middle of the outer circumference of the ring-shaped wedge blocks.

5. The metal-sealing dual-stage casing head with self-locking hanger of claim 1, wherein: the wing valve is characterized in that in a cylindrical blind hole valve cavity of a valve body of the wing valve, a valve rod penetrates through an inverted T-shaped valve rod nut, an inverted T-shaped groove above a gate plate and a cylindrical blind hole by using a screw rod at the lower end of the valve rod, and the valve rod drives a valve to open and close; and a pair of sand control plates which are filled in the valve cavities at the two sides of the flashboard and are provided with elastic sealing rings are symmetrically arranged below the valve seat.

6. The metal sealing double stage casing head with self locking hanger of claim 1 or 5, wherein: the wing valve middle sand control plate is a square thick steel plate with a plane at one side and an arc surface at one side, an arc notch is arranged on the steel plate, and a large chamfer is processed at the junction of the lower surface of the steel plate and the arc surface; drilling a through hole with a small diameter on the perpendicular bisector of the planes and the arc surfaces at the two sides of the sand control plate and at the position close to the upper arc-shaped notch; a square groove with four arc angles is symmetrically processed on the arc surface of the sand control plate, and an elastic sealing ring is arranged in the square groove.

7. The metal sealing dual stage casing head with self-locking hanger of claim 1, wherein: the stop buffer valve component is formed by combining six parts, namely a valve body, a meter connector, a valve rod nut, a valve rod, a hand wheel and a pressure relief screw, and a matched sealing element and a thread connecting piece; the valve body of the stop buffer valve is L-shaped, the main body part is a square column body or a cylinder body, a threaded hole is processed at the central part of the lower end, and the upper end is connected with the meter connector by a hollow screw column body and a cylinder body which are extended out and two elastic sealing rings carried by the cylinder body; the convex end on one side is cylindrical, and a valve rod nut, a valve rod, a sealing washer and a small elastic sealing ring are arranged in a larger threaded hole with a step in the center of the convex end; the other side corresponding to the protruding end is provided with a smaller threaded hole in which a pressure relief screw is arranged; a hand wheel is fixed at the outer end of the valve rod by a flat washer and a nut; in the interior of the valve body, the cylindrical deep hole at the upper end, the threaded hole at the lower end, the threaded hole with the step with the larger protruding end and the threaded hole with the smaller other side are communicated with each other by the holes with small diameters.