CN218439303U - Metal sealing single-stage casing head adopting self-locking hanger - Google Patents

Abstract

A metal seal single-stage casing head adopting a self-locking hanger is characterized in that a casing hanger with a self-locking mechanism is arranged above a central hole of a four-way joint of the casing head, and an elastic sealing ring and a metal seal assembly with three layers of inner and outer sealing lines are arranged on a cylinder body at the middle lower part of the casing hanger; the wing valves used on the two sides of the four-way joint of the casing head all adopt manual non-rising stem flat valves which are formed by separately combining flashboards and valve rod nuts and are provided with elastic sealing ring sand prevention plates; in the pressure measuring assembly used, a meter shut-off valve and a pressure gauge buffer are connected to form an integral shut-off buffer valve member. Therefore, the trouble that the fixed sleeve hanger is pressed from the outside by a plurality of locking screws and matched sealing components is avoided; and has the characteristics of light weight, good sealing performance, more labor-saving operation, more advanced performance, low cost price and the like.

Description

Metal sealing single-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 mandrel type casing hangers; the mandrel type casing hanger is arranged above a central step hole of a casing head four-way joint, and locking screws with sealing components are uniformly distributed on the periphery of a flange on the casing head four-way joint and are pressed and fixed from the outside; the problems of large number of parts, large and bulky product, multiple leakage links, high cost 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, and 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, easy sand blockage and the like; these problems increase the workload and economic burden on the user.

Disclosure of Invention

The utility model aims at designing a synthesize and adopt neotype self-locking casing hanger, metal seal assembly, manual dark pole wafer valve and the single-stage casing head of ending buffering valve part to further improve the comprehensive properties of casing head product, alleviate user's work and economic burden.

The utility model is composed of a base, a casing head four-way joint, a casing hanger, wing valves, threaded instrument flanges, a pressure measuring assembly, threaded flanges, a pipe plug, a matched sealing element and a threaded connecting piece on two sides; the difference is that: a casing hanger with a self-contained locking mechanism is arranged above a central hole of the casing head cross joint, and 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 casing hanger; the wing valves used on the two sides of the four-way joint of the casing head all adopt manual non-rising stem flat valves which are formed by separately combining flashboards and valve rod nuts 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 casing head cross, the installation is from the casing hanger of taking locking mechanism, consequently just saved in the casing head cross numerous locking screws that compress tightly fixed casing hanger from the outside of equipartition on the upper flange periphery and its supporting seal assembly, 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 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 the two sides of the four-way joint of the casing head are all manual non-rising stem flat valves which are formed by combining flashboards and valve rod nuts in a split mode and are provided with elastic sealing ring sand prevention plates, and the manual non-rising stem flat valves have 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 single-stage casing head are increased again, and the production cost and the selling price are further reduced.

Drawings

Fig. 1 is a partially sectional view of the overall structure and a central portion of the present invention;

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

fig. 3 is an enlarged schematic view of a full-section rotating structure of the wing valve component of the present invention;

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

fig. 5 is an enlarged schematic view of a stop buffer valve of the present invention in a full section.

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

1. the device comprises a base, 2, a casing head four-way joint, 3, a 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 metal sealing ring, 3-7, a support ring, 3-8, a round nut, 3-9, a set screw, 4, a sealing gasket ring, 5, a stud nut, 6, a wing valve, 6-1, a valve body, 6-2, a valve rod, 6-3, a valve rod nut, 6-4, a flashboard, 6-5, a valve seat, 6-6, a sand control plate, 6-7, an elastic sealing ring, 7, a threaded instrument flange, 8, a double male joint, 9, a stop buffer valve, 9-1, a valve body, 9-2, an instrument joint, 9-3, a valve rod nut, 9-4, a valve rod, 9-5, a hand wheel, 9-6, a screw, 10, a pressure gauge, 11, pressure relief, a threaded flange, 12 and a pipe plug.

Detailed Description

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

in fig. 1, the utility model discloses by base 1, casing head cross 2, casing hanger 3 and the wing valve 6 of its both sides installation, screw thread formula instrument flange 7, pressure measurement assembly, screw thread formula flange 11, plug 12 and supporting sealing member, the threaded connection spare that uses constitute. The lower part of the casing head cross joint 2 is welded on the upper surface of the base 1 and is arranged on a cement foundation of a wellhead; one side of the casing head cross joint 2 is connected with a wing valve 6, a threaded instrument flange 7 and a pipe plug 12 by a sealing gasket ring 4 and a stud nut 5; a pressure measuring assembly is arranged above the threaded instrument flange 7 and is used for measuring the pressure between the sleeves; on the other side of the casing head four-way joint 2, a sealing gasket ring 4 and a stud nut 5 are connected with a wing valve 6, a threaded flange 11 and a pipe plug 12; a mandrel type casing hanger 3 is arranged in a central hole above the casing head four-way joint 2, and a groove with the thickness larger than or equal to that of an annular wedge 3-3 in the hanger is cut at the position corresponding to the annular wedge 3-3 in the hanger and is matched and locked with the annular wedge 3-3.

In fig. 2, a 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 sealing ring 3-5, a metal sealing ring 3-6, a support ring 3-7, a round nut 3-8 and a set screw 3-9; the sleeve hanger 3-1 is a cushion core cylindrical part with a thick middle part and two thin ends, the center of the cylindrical part is a through stepped hole, and two ends of the stepped hole are both processed into conical pipe threads; a locking mechanism consisting of a driving nut 3-2, an annular wedge 3-3 and a spring ring 3-4 is arranged at the stud and the groove at the upper part; an elastic sealing ring 3-5 and a metal sealing component with three layers of inner and outer sealing lines are arranged on the cylinder body and the screw cylinder body at the lower part of the cylinder body. The metal seal assembly with three layers of inner and outer seal lines consists of three layers of superposed metal seal rings 3-6 with splayed cross sections, a support ring 3-7 with a trapezoidal cross section above, a round nut 3-8 and a set screw 3-9; the annular space below the casing hanger 3 is sealed under the gravity of the hanging casing, the extrusion of the steps in the central hole of the casing head four-way 2 and the support rings 3-7 so as to deal with corrosive media from the underground.

The utility model discloses a casing hanger 3, the periphery of drive nut 3-2 is bright and clean cylinder, and the centre is the screw thread through-hole, and the upper end processing has the axial recess of 4 ~ 6 symmetries, and the lower extreme processing has a big chamfer. The annular wedge block 3-3 is an annular assembly with the outer diameter smaller than or equal to the maximum diameter of the casing hanger 3-1 after being combined; the upper and lower parts of the annular wedge block 3-3 are planes, chamfers with the angle less than or equal to 30 degrees are processed at the edges, 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 screw cap 3-2; the annular wedge 3-3 is symmetrically cut into 4-6 pieces and is bound together by a spring ring 3-4 in a groove at the middle part of the outer circumference of the annular wedge.

In fig. 3 and 4, two wing valves 6 used in the present invention are both a new type of manual non-rising stem flat valve; in the cylindrical blind hole valve cavity of the valve body 6-1, the valve rod 6-2 penetrates through an upper-shaped valve rod nut 6-3, an upper-shaped groove above the flashboard 6-4 and the cylindrical blind hole by using a screw rod at the lower end of the valve rod, and drives the valve to open and close; a pair of sand control plates 6-6 which are filled in the valve cavities at the two sides of the gate plate 6-4 and are provided with elastic sealing rings 6-7 are symmetrically arranged below the valve seat 6-5. The sand control plate 6-6 in the wing valve 6 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 perpendicular bisector of the planes and the arc surfaces at the two sides of the sand control plate 6-6 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-proof plate 6-6, an elastic sealing ring 6-7 is arranged in the square groove, and after the square groove is contacted with the wall of a valve cavity hole of the valve body 6-1, elastic force for pushing the sand-proof plate 6-6 to be tightly attached to the flashboard 6-4 can be generated.

In fig. 5, the pressure measuring assembly of the present invention comprises a double male connector 8, a stop buffer valve 9 and a pressure gauge 10. The stop buffer valve 9 is an integral part connecting a common instrument stop valve and a pressure gauge buffer. The component is formed by combining six parts, namely a valve body 9-1, a meter connector 9-2, a valve rod nut 9-3, a valve rod 9-4, a hand wheel 9-5 and a pressure relief screw 9-6, and a matched sealing element and a thread connecting piece. The valve body 9-1 of the stop buffer valve 9 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 9-2 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 at one side is cylindrical, and a valve rod nut 9-3, a valve rod 9-4, a sealing washer and a small elastic sealing ring are arranged in a larger threaded hole with a step at 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 9-6 is arranged; the outer end of the valve rod 9-4 is fixed with a hand wheel 9-5 by a flat washer and a nut. Inside the valve body 9-1, 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 9-4 is matched with a small-diameter hole communicated with a threaded hole at the lower end of the valve body 9-1, and has the function of a stop valve; the small diameter hole in the valve body 9-1 has a buffering function after twice turning and expansion of the stepped threaded hole and the cylindrical deep hole, so that the pressure gauge 10 is protected.

The utility model discloses an elastic sealing ring 3-5 that casing hanger 3 used, elastic sealing ring 6-7 that use in wing valve 6 and by the elastic sealing ring that uses in the cushion valve 9, 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 mutual parallel straight line limits. All elastic sealing rings are made of FKM fluororubber or HNBR high saturated hydrogenated nitrile rubber materials to cope with high pressure and corrosive gases.

When the casing hanger 3 is installed, the sleeve spanner is firstly used for rotating the driving nut 3-2 to move upwards, and the annular wedge block 3-3 can be reduced to be within the maximum diameter of the casing hanger 3-1 under the action of the spring ring 3-4; conical pipe threaded holes at the upper end and the lower end of a central hole of the casing hanger 3-1 are respectively connected with a hanger rod and a casing pipe placed in a well; with the help of the suspender, the casing head cross joint is placed in a central step hole of the casing head cross joint 2; a metal sealing component below the casing hanger 3-1 is used for setting under the gravity action of the suspended casing; then the sleeve spanner and the driving nut 3-2 are rotated to move downwards, and the annular wedge block 3-3 is pushed to be wedged into a groove corresponding to a central hole of the casing hanger 3, so that the casing hanger 3 is locked from the inside; 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 3 needs to be disassembled, the annular wedge 3-3 can be taken out by the hanger rod only by rotating the driving nut 3-2 by a socket wrench to move upwards and retracting the annular wedge 3-3 to the maximum diameter of the casing hanger 3-1.

Claims (7)

1. A metal sealing single-stage casing head adopting a self-locking hanger is formed by combining a base, a casing head four-way joint, a casing hanger, wing valves on two sides, a threaded instrument flange, a pressure measuring assembly, a threaded flange, a pipe plug, a matched sealing piece and a threaded connecting piece; the method is characterized in that: a casing hanger with a self-contained locking mechanism is arranged above a central hole of the casing head cross joint, and 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 casing hanger; the wing valves used on the two sides of the four-way joint of the casing head all adopt manual non-rising stem flat valves which are formed by separately combining flashboards and valve rod nuts 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.

2. The metal-sealed single-stage casing head using a self-locking hanger as claimed in claim 1, wherein: the casing hanger consists of a casing hanger, a driving nut, an annular wedge block, a spring ring, an elastic sealing ring, a metal sealing ring, a support ring, a round nut and a set screw; the casing hanger is a hollow cylindrical part with a thick middle part and thin two ends, and a locking mechanism consisting of a driving nut, an annular wedge block and a spring ring is arranged at a stud and a groove at the upper part of the casing hanger.

3. The metal-sealed single-stage casing head using a self-locking hanger as claimed in 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-sealed single-stage casing head with a self-locking hanger as claimed in claim 2, wherein: in the 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 spring rings in the grooves in the middle of the outer circumference of the ring-shaped wedge blocks.

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

6. The metal sealing single-stage casing head using the self-locking hanger as claimed in claim 1 or 5, wherein: the sand control plate in the wing valve 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; on the arc surface of the sand control plate, a square groove with four arc angles is symmetrically processed, and an elastic sealing ring is arranged in the square groove.

7. The metal-sealed single-stage casing head using a self-locking hanger as claimed in 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; 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.

Images