CN215520830U - High-temperature-resistant and high-sulfur-resistant three-layer casing head - Google Patents

Abstract

A high-temperature-resistant and high-sulfur-resistant three-layer casing head comprises a three-layer casing head assembly from bottom to top, wherein the bottom casing head assembly comprises a bottom casing head body, a bottom mandrel hanger is arranged in the inner cavity of the bottom casing head body, a middle-layer casing head assembly comprises a middle-layer casing head body, a middle-layer mandrel hanger is arranged in the inner cavity of the middle-layer casing head body, the upper-layer casing head assembly comprises an upper-layer casing head body, an upper mandrel hanger is arranged in the inner cavity of the upper-layer casing head body, and a metal and rubber sealing element is adopted between the bottom mandrel hanger and the middle-layer casing head body to form a secondary sealing partition at the bottom of the middle-layer casing head; the middle-layer mandrel type hanger and the upper-layer casing head body are sealed by metal and rubber to form secondary sealing at the bottom of the upper-layer casing head. The three-layer casing head with high temperature resistance and high sulfur resistance is jointly controlled from two aspects of material selection and structural design, has the characteristics of high temperature resistance and high sulfur resistance, and meets the requirements of manufacturing well control devices in three-high areas.

Description

High-temperature-resistant and high-sulfur-resistant three-layer casing head

Technical Field

The utility model belongs to the technical field of oil and gas exploitation well control equipment, relates to a three-layer casing head, and particularly relates to a high-temperature-resistant high-sulfur-resistance three-layer casing head.

Background

At present, the requirement on HSE (high-temperature-resistant, high-sulfur-content and high-yield oil and gas fields) for oil and gas exploitation is known to be more and more severe, the requirement on a drilling well control device for oil and gas exploitation is higher and higher, and the high-temperature-resistant, high-sulfur-content and high-yield oil and gas fields are often explored in many regions. Therefore, the high-temperature resistant (180 ℃) and high-sulfur (H) content₂S content 13% to 17%) are increasingly in demand, and existing devices are not able to withstand high temperature and high sulfur containing environments.

SUMMERY OF THE UTILITY MODEL

In order to solve the existing problems, the utility model aims to provide a high-temperature-resistant and high-sulfur-resistant three-layer casing head, which is manufactured by jointly controlling the material selection and the structural design of the high-temperature-resistant and high-sulfur-resistant three-layer casing head, so that the requirement on manufacturing of a well control device in a three-high area is met.

In order to achieve the purpose, the technical scheme of the utility model is as follows:

a high-temperature-resistant and high-sulfur-resistant three-layer casing head comprises a three-layer casing head assembly, a bottom-layer casing head assembly, a middle-layer casing head assembly and an upper-layer casing head assembly from bottom to top in sequence, the bottom casing head assembly comprises a bottom casing head body, a bottom mandrel type hanger is arranged in the inner cavity of the bottom casing head body, the middle-layer casing head assembly comprises a middle-layer casing head body, a middle-layer mandrel hanger is arranged in the inner cavity of the middle-layer casing head body, the upper layer casing head assembly comprises an upper layer casing head body, an upper layer mandrel type hanger is arranged in the inner cavity of the upper layer casing head body, the bottom layer casing head body and the middle layer casing head body are fixedly connected through a first bolt component, the middle-layer casing head body and the upper-layer casing head body are fixedly connected through a second bolt assembly; a group of first rubber sealing parts and a group of first metal sealing parts are arranged between the middle part of the bottom mandrel type hanger and the inner wall of the bottom casing head body, between the middle part of the middle mandrel type hanger and the inner wall of the middle casing head body, and between the middle part of the upper mandrel type hanger and the inner wall of the upper casing head body, and a metal sealing and rubber sealing ring combined sealing mode is adopted, and the metal sealing is realized by extruding a jackscrew and screwing two flange bolts together; a second metal sealing element and a second rubber sealing element are adopted between the bottom mandrel type hanger and the middle-layer casing head body to form a secondary sealing of the bottom of the middle-layer casing head; and a third metal sealing piece and a third rubber sealing piece are adopted between the middle-layer mandrel type hanger and the upper-layer casing head body to form secondary sealing at the bottom of the upper-layer casing head.

Further, in the above structure, a jackscrew channel is radially opened in the flange on the bottom casing head body, in the flange on the middle casing head body and in the flange on the upper casing head body, and a group of jackscrew assemblies are respectively installed in the three jackscrew channels; two grease injection pressure test pore channels are formed in the lower flange of the middle-layer casing head body and the lower flange of the upper-layer casing head body along the radial direction, and a group of sealing pressure test assemblies are respectively mounted at the outer ports of the grease injection pressure test pore channels; a second rubber sealing element is connected into a grease injection pressure test pore channel I formed in a lower flange of the middle-layer casing head body, and the grease injection pressure test pore channel I, the middle-layer casing head body and the middle-layer mandrel type hanger are sealed through the second rubber sealing element; and a third rubber sealing element is connected in a grease injection pressure test pore channel II arranged in a lower flange of the upper casing head body, and the grease injection pressure test pore channel II is sealed with the upper casing head body and the upper mandrel type hanger through the third rubber sealing element.

Further, in the above structure, the second metal sealing element is composed of a second upper metal sealing ring, a second lower metal sealing ring, a second metal press ring and a second P-type sealing ring; the third metal sealing element consists of a third upper metal sealing ring, a third lower metal sealing ring, a third metal pressure ring and a third P-shaped sealing ring; the second upper metal sealing ring and the second lower metal sealing ring of the second metal sealing element are C-shaped metal sealing rings; the third upper metal sealing ring and the third lower metal sealing ring of the third metal sealing element are C-shaped metal sealing rings; the second rubber sealing piece and the third rubber sealing piece are of BT sealing ring structures made of FKM fluororubber, the HS hardness is 85 +/-5, and sealing is achieved through grease injection; the first rubber sealing element is an O-shaped rubber sealing ring, and the first metal sealing element is a C-shaped metal sealing ring. The secondary packing at the bottom of the casing head adopts a metal and rubber sealing combined sealing mode, wherein the metal sealing depends on tightening two flange bolts, so that the metal sealing ring realizes the expansion inside and outside and further realizes effective sealing.

Further, in the above structure, the jackscrew assembly includes a jackscrew body, a jackscrew sealing ring, a jackscrew filler and a jackscrew pressing cap; the jackscrew body is sequentially connected with the jackscrew sealing ring and the jackscrew filler, and a jackscrew pressing cap is arranged on the right side of the jackscrew; the sealing pressure test assembly comprises a plug connector and a grease injection pressure test valve.

Further, in the above structure, the first bolt assembly and the second bolt assembly each include a stud bolt, a nut, and a gasket ring.

Furthermore, in the above structure, the first manual plate valve and the second manual plate valve are respectively arranged on the two opposite side bypasses of the bottom casing head body, the middle casing head body and the upper casing head body.

Further, in the structure, first manual plate valve includes first dull and stereotyped valve body, first ring flange is connected through the screw thread flange and the casing head body, the relative other end of planting the screw bolt nut subassembly connection corresponding layer to the one end of first dull and stereotyped valve body, first plug joint is connected to the other end of first ring flange, first plug joint is connected to first plug joint, be provided with two scale sulphur-proof antidetonation manometer on the first plug joint, the end connection of first plug joint has square right angle stop valve.

Furthermore, in the structure, the second manual plate valve comprises a second plate valve body, one end of the second plate valve body is connected with the casing head body on the corresponding layer and the other opposite end of the casing head body on the corresponding layer through a screw thread flange and a screw planting bolt and nut assembly, and the end part of the second flange is connected with a second plug connector. And a metal sealing steel ring is also arranged between the screw thread flange and the sleeve head body of the corresponding layer. In addition, the valves of the first manual flat valve and the second manual flat valve are all in FLS structures, valve plates and valve seats of the valves are sealed by metal, and no rubber sealing piece is arranged inside the valves, so that the stability of the sealing performance is ensured.

Furthermore, in the above structure, octagonal ring steel rings are disposed between the bottom casing head body and the middle casing head body, outside the second metal sealing element, between the middle casing head body and the upper casing head body, and outside the third metal sealing element.

Furthermore, in the structure, the metal components of the three-layer casing head with high temperature resistance and high sulfur resistance are all prepared from high temperature resistance and high sulfur resistance alloy, and the parts in contact with the medium are all formed by alloy surfacing.

Specifically, the bottom layer casing head body, the middle layer casing head body, the upper layer casing head body, the first flat valve body and the valve cover, and the second flat valve body and the valve cover are all made of high-temperature-resistant and high-sulfur-resistant alloy steel 4130, the HRC hardness is controlled to be less than or equal to 22, the NACE MR0175 sulfur-resistant requirement is met, the mechanical property meets the 75K requirement, inconel 625 alloy surfacing is carried out on all parts in contact with a medium, and the thickness of a welding layer is not less than 3.5 mm.

In addition, the bottom layer mandrel type hanger, the middle layer mandrel type hanger, the upper layer mandrel type hanger, the jackscrew body, the jackscrew pressing cap, the valve rod, the valve plate and the valve seat of the first flat plate valve and the second flat plate valve are all made of inconel 718 materials, the HRC hardness is 32-40, the unlimited requirement of NACE MR0175 hydrogen sulfide resistance is met, and the mechanical performance meets the 120K requirement.

Moreover, nonmetallic sealing elements such as jackscrew sealing rings, valve rod packing of the first flat plate valve and the second flat plate valve and valve seat sealing rings adopt PEEK + + Elgiloy; the octagonal ring steel ring, the metal sealing steel ring and the C-shaped metal sealing ring forming the secondary sealing at the bottom of the casing head are all made of inconel 825 alloy, and the HRB hardness is less than or equal to 92; the second rubber sealing element and the third rubber sealing element are made of FKM fluororubber.

The technical scheme shows that the utility model has the following beneficial effects: the three-layer casing head with high temperature resistance and high sulfur resistance successfully solves the problem of high temperature resistance of a well control casing head by selecting materials, and has the characteristic of high temperature resistance; the problem of high sulfur content of the well control casing head is successfully overcome through structural design, and the well control casing head has the characteristic of high sulfur corrosion resistance; successfully fills the domestic blank of the high-temperature-resistant high-sulfur-content well control casing head. The nonmetal sealing element is made of PEEK and FKM materials, and has good sealing performance at a high temperature of 180 ℃; all parts of the three-layer casing head, which are in contact with a medium, are made of alloy, the alloy has no upper limit on hydrogen sulfide corrosion, the mandrel type casing hanger and the secondary packing at the bottom of the casing head adopt metal sealing structures, and the material is inconel 825 alloy, so that the sealing performance is ensured.

Drawings

FIG. 1 is a schematic structural view of a three-layer casing head of the present invention with high temperature resistance and high sulfur resistance;

FIG. 2 is a schematic structural view of the upper casing head assembly according to the present invention;

FIG. 3 is a schematic structural view of a middle casing head assembly according to the present invention;

FIG. 4 is a schematic structural view of an underlying casing head assembly according to the present invention;

FIG. 5 is a schematic structural view of the jackscrew assembly of the present invention;

FIG. 6 is a schematic structural view of a second metal seal according to the present invention;

fig. 7 is a schematic structural diagram of a third metal seal according to the present invention.

In the figure: 1 a bottom layer casing head body, 2 a bottom layer mandrel type hanger, 3 a middle layer casing head bottom secondary packing, 31 a second rubber sealing element and 32 a second metal sealing element; 321 a second upper metal sealing ring, 322 a second lower metal sealing ring and 323 a second metal press ring; 324 a second P-ring seal; 621 a third upper metal sealing ring, 622 a third lower metal sealing ring, 623 a third metal press ring and 624 a third P-type sealing ring; 4 a middle-layer casing head body, 5 a middle-layer mandrel type hanger, 6 an upper-layer casing head bottom secondary packing, 61 a third rubber sealing element, 62 a third metal sealing element, 7 an upper-layer casing head body and 8 an upper-layer mandrel type hanger; 9 a first bolt assembly; 10 a second bolt assembly; 11 a first rubber seal, 12 a first metal seal;

14 jackscrew components, 141 jackscrew bodies, 142 jackscrew sealing rings, 143 jackscrew fillers and 144 jackscrew pressing caps; 15, a pressure test component; 16 a first manual flat valve, 161 a first flat valve body, 162 a first flange plate, 163 a first screwed plug connector, 164 a first male-female connector, 165 a double-scale sulfur-proof shock-proof pressure gauge and 166 a square right-angle stop valve; 17 a second manual flat valve, 171 a second flat valve body, 172 a second flange and 173 a second plug connector; 18 octagonal ring steel rings;

43 and 73 are respectively provided with a grease injection pressure test pore channel I and a grease injection pressure test pore channel II.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Example 1

The high-temperature-resistant and high-sulfur-resistant three-layer casing head as shown in fig. 1-7 comprises a three-layer casing head assembly, which comprises a bottom-layer casing head assembly, a middle-layer casing head assembly and an upper-layer casing head assembly from bottom to top in sequence, the bottom casing head assembly comprises a bottom casing head body 1, a bottom mandrel type hanger 2 is arranged in the inner cavity of the bottom casing head body 1, the middle-layer casing head assembly comprises a middle-layer casing head body 4, a middle-layer mandrel type hanger 5 is arranged in the inner cavity of the middle-layer casing head body 4, the upper layer casing head assembly comprises an upper layer casing head body 7, an upper layer mandrel type hanger 8 is arranged in the inner cavity of the upper layer casing head body 7, the bottom layer casing head body 1 and the middle layer casing head body 4 are fixedly connected through a first bolt component 9, the middle-layer casing head body 4 and the upper-layer casing head body 7 are fixedly connected through a second bolt assembly 10; a group of first rubber sealing parts 11 and a group of first metal sealing parts 12 are arranged between the middle part of the bottom mandrel type hanger 2 and the inner wall of the bottom casing head body 1, between the middle part of the middle mandrel type hanger 5 and the inner wall of the middle casing head body 4, and between the middle part of the upper mandrel type hanger 8 and the inner wall of the upper casing head body 7, and a metal sealing and rubber sealing ring combined sealing mode is adopted, and the metal sealing is sealed by extruding a jackscrew and screwing two flange bolts together; a second rubber sealing element 31 and a second metal sealing element 32 are adopted between the bottom layer mandrel type hanger 2 and the middle layer casing head body 4 to form a middle layer casing head bottom secondary seal 3; and a secondary seal 6 at the bottom of the upper-layer casing head is formed between the middle-layer mandrel type hanger 5 and the upper-layer casing head body 7 by adopting a third rubber sealing piece 61 and a third metal sealing piece 62.

In the structure, a jackscrew channel is radially arranged in each of the flange on the bottom casing head body 1, the flange on the middle casing head body 4 and the flange on the upper casing head body 7, and a group of jackscrew assemblies 14 are respectively arranged in the three jackscrew channels; two grease injection pressure test pore channels are formed in the lower flange of the middle-layer casing head body 4 and the lower flange of the upper-layer casing head body 7 along the radial direction, and a group of sealing pressure test assemblies 15 are respectively mounted at the outer ports of the grease injection pressure test pore channels; a second rubber sealing element 31 is connected into a grease injection pressure test pore channel I43 formed in a lower flange of the middle-layer casing head body 4, and the grease injection pressure test pore channel I43, the middle-layer casing head body 4 and the middle-layer mandrel type hanger 5 are sealed through the second rubber sealing element 31; and a third rubber sealing element 61 is connected in a grease injection pressure test pore channel II 73 arranged in a lower flange of the upper casing head body 7, and the grease injection pressure test pore channel II 73 is sealed with the upper casing head body 7 and the upper mandrel type hanger 8 through the third rubber sealing element 61.

In the above structure, the second metal sealing element 32 is composed of a second upper metal sealing ring 321, a second lower metal sealing ring 322, a second metal pressing ring 323 and a second P-type sealing ring 324; the third metal sealing element 62 is composed of a third upper metal sealing ring 621, a third lower metal sealing ring 622, a third metal pressing ring 623 and a third P-shaped sealing ring 624; the second upper metal sealing ring 321 and the second lower metal sealing ring 322 of the second metal sealing element 32 are C-shaped metal sealing rings; the third upper metal sealing ring 621 and the third lower metal sealing ring 622 of the third metal sealing element 62 are C-shaped metal sealing rings; the second rubber sealing element 31 and the third rubber sealing element 61 are BT sealing ring structures made of FKM fluororubber, the HS hardness is 85 +/-5, and sealing is realized by injecting grease; the first rubber sealing element 11 is an O-shaped rubber sealing ring, and the first metal sealing element 12 is a C-shaped metal sealing ring. The secondary packing at the bottom of the casing head adopts a metal and rubber sealing combined sealing mode, wherein the metal sealing depends on tightening two flange bolts, so that the metal sealing ring realizes the expansion inside and outside and further realizes effective sealing.

Further, in the above structure, the jack screw assembly 14 includes a jack screw body 141, a jack screw sealing ring 142, a jack screw packing 143, and a jack screw pressing cap 144; the jackscrew body 141 is sequentially connected with a jackscrew sealing ring 142 and a jackscrew packing 143, and a jackscrew pressing cap 144 is arranged on the right side of the jackscrew; the sealing pressure test assembly 15 comprises a plug connector and a grease injection pressure test valve.

Further, in the above structure, the first bolt assembly 9 and the second bolt assembly 10 each include a stud bolt, a nut, and a gasket ring.

Further, in the above structure, the first manual flat valve 16 and the second manual flat valve 17 are respectively disposed on two opposite side bypasses of the bottom casing head body 1, the middle casing head body 4 and the upper casing head body 7.

Further, in the above structure, first manual plate valve 16 includes first flat valve body 161, first ring flange 162 is connected through screw flange 19 and the bushing head body that the screw bolt nut subassembly 20 was planted to the one end of first flat valve body 161 and the relative other end on corresponding layer, first plug joint 163 is connected to the other end of first ring flange 162, first plug joint 164 is connected to first plug joint 163, be provided with two scales on the first plug joint 164 and prevent sulphur antidetonation manometer 165, the end connection of first plug joint 164 has square right angle stop valve 166.

Further, in the above structure, the second manual plate valve 17 includes a second plate valve body 171, one end of the second plate valve body 171 is connected to the casing head body of the corresponding layer through the screw flange 19 and the screw-nut assembly 20, the opposite end is connected to the second flange 172, and the end of the second flange 172 is connected to the second plug connector 173. And a metal sealing steel ring is also arranged between the screw thread flange 19 and the sleeve head body of the corresponding layer.

In addition, the valves of the first manual flat valve and the second manual flat valve are all in FLS structures, valve plates and valve seats of the valves are sealed by metal, and no rubber sealing piece is arranged inside the valves, so that the stability of the sealing performance is ensured.

Further, in the above structure, the octagonal ring steel rings 18 are disposed between the bottom casing head body 1 and the middle casing head body 4, outside the second metal sealing element 32, between the middle casing head body 4 and the upper casing head body 7, and outside the third metal sealing element 62.

Furthermore, in the structure, the metal components of the three-layer casing head with high temperature resistance and high sulfur resistance are all prepared from high temperature resistance and high sulfur resistance alloy, and the parts in contact with the medium are all formed by alloy surfacing.

Specifically, the bottom layer casing head body 1, the middle layer casing head body 4, the upper layer casing head body 7, the first flat valve body 161, the valve cover, the second flat valve body 171 and the valve cover are all made of high temperature resistant and high sulfur resistant alloy steel 4130, the HRC hardness is controlled to be less than or equal to 22, the NACE MR0175 sulfur resistant requirement is met, the mechanical performance meets the 75K requirement, inconel 625 alloy surfacing welding is carried out on all parts in contact with a medium, and the thickness of a welding layer is not less than 3.5 mm. Here, the mechanical properties of the material meet the requirements of 75K, and the corresponding mechanical property values are as follows: the 0.2% set yield strength (minimum) was 517 MPa (75,000 psi), the tensile strength (minimum) was 655 MPa (95,000 psi), the elongation (minimum) at 50mm was 17%, and the reduction of area (minimum) was 35%.

In addition, the bottom-layer mandrel type hanger 2, the middle-layer mandrel type hanger 5, the upper-layer mandrel type hanger 8, the jackscrew body 141, the jackscrew pressing cap 144, and the valve rod, the valve plate and the valve seat of the first flat plate valve 16 and the second flat plate valve 17 are all made of inconel 718 materials, the HRC hardness is 32-40, the unlimited requirement of NACE MR0175 on hydrogen sulfide resistance is met, and the mechanical performance meets the 120K requirement. Here, it should be noted that: the mechanical property of the material meets the requirement of 120K, and the corresponding mechanical property numerical value is as follows: 0.2% set yield strength (minimum) 827 MPa (120,000 psi), tensile strength (minimum) 1034 MPa (150,000 psi), elongation (minimum) of 50mm 20%, and reduction of area (minimum) 35%.

Moreover, nonmetallic sealing elements such as a jackscrew sealing ring 142, a valve rod packing of the first flat plate valve 16 and a valve seat sealing ring of the second flat plate valve 17 adopt PEEK + + Elgiloy (alloy spring); the octagonal ring steel ring 18, the metal sealing steel ring and the C-shaped metal sealing ring forming the secondary sealing at the bottom of the casing head are made of inconel 825 alloy, and the HRB hardness is less than or equal to 92; the second rubber seal 31 and the third rubber seal 61 are made of FKM fluororubber.

During installation, a bottom layer casing head assembly is installed firstly according to a drilling process, after relevant operations, a bottom layer mandrel type hanger 2 is installed before casing and cementing, after cementing, the bottom layer mandrel type hanger 2 is installed in an inner cavity of a bottom layer casing head body 1, then a middle layer casing head body 4 is installed, and the middle layer casing head body 4 and the bottom layer mandrel type hanger are sealed by adopting metal and rubber combination to form secondary middle layer casing head bottom packing.

After the middle-layer casing head assembly is installed, after relevant operations are carried out, before casing running and well cementing, a middle-layer mandrel type hanger 5 is installed, after well cementing, the middle-layer mandrel type hanger 5 is installed in the inner cavity of the middle-layer casing head body 4, then an upper-layer casing head body 7 is installed, and metal and rubber combination sealing is adopted between the upper-layer casing head body 7 and the middle-layer mandrel type hanger 5 to form secondary sealing at the bottom of the upper-layer casing head.

After the upper-layer casing head assembly is installed, after relevant operation is carried out, before casing is put into a well to fix the well, an upper-layer mandrel type hanger 8 is installed, after the well is fixed, the upper-layer mandrel type hanger 8 is installed in the inner cavity of the upper-layer casing head body 7, then a tubing head assembly (not shown in the figure) is installed, and a sealing neck reserved in the upper-layer mandrel type hanger 8 can form metal and rubber combined sealing with the tubing head (not shown in the figure).

The related operations described above are: installing a drilling cross joint and a blowout preventer group on a casing head, using a pressure testing plug to test the pressure of a steel ring at the upper part of the casing head, the drilling cross joint and the blowout preventer group, taking out the pressure testing plug after the pressure testing is qualified, using a special taking and delivering tool for an anti-abrasion sleeve to lower the anti-abrasion sleeve, drilling a well by a lower drill bit, taking out a drilling tool after the drilling well is drilled to the designed well depth, using the special taking and delivering tool for the anti-abrasion sleeve to take out the anti-abrasion sleeve, installing an upper-layer metal sealing mandrel type hanger after the casing is circulated, and lifting the mandrel type hanger after the casing is in place.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the present invention, and these modifications should also be construed as the protection scope of the present invention.

Claims (10)

1. The utility model provides a three-layer casing head of high temperature resistant high sulphur resistance which characterized in that: high temperature resistant high anti sulphur's three-layer casing head, including three-layer casing head assembly, from the bottom up is bottom casing head assembly, middle level casing head assembly and upper casing head assembly in proper order, bottom casing head assembly includes bottom casing head body (1), bottom casing head body (1) inner chamber is provided with the axle type hanger of bottom core (2), middle level casing head assembly includes middle level casing head body (4), middle level casing head body (4) inner chamber is provided with the axle type hanger of middle level core (5), upper casing head assembly includes upper casing head body (7), upper casing head body (7) inner chamber is provided with the axle type hanger of upper core (8), through first bolt component (9) fixed connection between bottom casing head body (1) and middle level casing head body (4), through second bolt component (10) fixed connection between middle level casing head body (4) and upper casing head body (7) Connecting; a group of first rubber sealing pieces (11) and a group of first metal sealing pieces (12) are arranged between the middle part of the bottom mandrel type hanger (2) and the inner wall of the bottom casing head body (1), between the middle part of the middle mandrel type hanger (5) and the inner wall of the middle casing head body (4), and between the middle part of the upper mandrel type hanger (8) and the inner wall of the upper casing head body (7); a secondary packing (3) at the bottom of the middle-layer casing head is formed between the bottom-layer mandrel type hanger (2) and the middle-layer casing head body (4) by adopting a second rubber sealing element (31) and a second metal sealing element (32); and a secondary packing (6) at the bottom of the upper-layer casing head is formed between the middle-layer mandrel type hanger (5) and the upper-layer casing head body (7) by adopting a third rubber sealing piece (61) and a third metal sealing piece (62).

2. The three-layer casing head of claim 1, wherein: a jackscrew channel is radially arranged in each of a flange on the bottom casing head body (1), a flange on the middle casing head body (4) and a flange on the upper casing head body (7), and a group of jackscrew assemblies (14) are respectively arranged in the three jackscrew channels; two grease injection pressure test pore paths are radially formed in the lower flange of the middle-layer casing head body (4) and the lower flange of the upper-layer casing head body (7), and a group of sealing pressure test assemblies (15) are respectively mounted at the outer ports of the grease injection pressure test pore paths; a grease injection pressure test pore channel I (43) formed in a lower flange of the middle-layer casing head body (4) is internally connected with a second rubber sealing element (31), and the grease injection pressure test pore channel I (43), the middle-layer casing head body (4) and the middle-layer mandrel type hanger (5) are sealed through the second rubber sealing element (31); and a third rubber sealing element (61) is connected in a grease injection pressure test pore channel II (73) arranged in a lower flange of the upper-layer casing head body (7), and the grease injection pressure test pore channel II (73) is sealed with the upper-layer casing head body (7) and the upper-layer mandrel type hanger (8) through the third rubber sealing element (61).

3. The three-layer casing head of claim 2, wherein: the second metal sealing element (32) consists of a second upper metal sealing ring (321), a second lower metal sealing ring (322), a second metal pressing ring (323) and a second P-shaped sealing ring (324); the third metal sealing element (62) consists of a third upper metal sealing ring (621), a third lower metal sealing ring (622), a third metal pressing ring (623) and a third P-shaped sealing ring (624); the second upper metal sealing ring (321) and the second lower metal sealing ring (322) of the second metal sealing element (32) are C-shaped metal sealing rings; a third upper metal sealing ring (621) and a third lower metal sealing ring (622) of the third metal sealing element (62) are C-shaped metal sealing rings; the second rubber sealing element (31) and the third rubber sealing element (61) are of BT sealing ring structures made of FKM fluororubber, the HS hardness is 85 +/-5, and sealing is achieved through grease injection; the first rubber sealing element (11) is an O-shaped rubber sealing ring, and the first metal sealing element (12) is a C-shaped metal sealing ring.

4. The three-layer casing head of claim 2, wherein: the jackscrew component (14) comprises a jackscrew body (141), a jackscrew sealing ring (142), a jackscrew filler (143) and a jackscrew pressing cap (144); the jackscrew body (141) is sequentially connected with the jackscrew sealing ring (142) and the jackscrew packing (143), and a jackscrew pressing cap (144) is arranged on the right side of the jackscrew; the sealing pressure test assembly (15) comprises a plug connector and a grease injection pressure test valve.

5. The three-layer casing head of claim 1, wherein: the first bolt assembly (9) and the second bolt assembly (10) both comprise a stud bolt, a nut and a sealing gasket ring.

6. The three-layer casing head of claim 1, wherein: and the opposite side bypasses of the bottom layer casing head body (1), the middle layer casing head body (4) and the upper layer casing head body (7) are respectively provided with a first manual flat valve (16) and a second manual flat valve (17).

7. The three-layer casing head of claim 6, wherein: first manual wafer valve (16) are including first flat valve body (161), first ring flange (162) are connected to the one end of first flat valve body (161) through screw thread flange (19) and the bushing head body, the relative other end of planting screw bolt nut subassembly (20) connection corresponding layer, first plug connects (163) is connected to the other end of first ring flange (162), first public female joint (164) is connected in first plug connects (163), be provided with two scales on first public female joint (164) and prevent sulphur antidetonation manometer (165), the end connection of first public female joint (164) has square right angle stop valve (166).

8. The three-layer casing head of claim 6, wherein: the second manual flat valve (17) comprises a second flat valve body (171), one end of the second flat valve body (171) is connected with the sleeve head body on the corresponding layer and the other opposite end of the sleeve head body on the corresponding layer through a screw thread flange (19) and a wire planting bolt and nut assembly (20) to form a second flange plate (172), and the end part of the second flange plate (172) is connected with a second plug connector (173).

9. The three-layer casing head of claim 1, wherein: and octagon ring steel rings (18) are arranged between the bottom layer casing head body (1) and the middle layer casing head body (4), outside the second metal sealing element (32), between the middle layer casing head body (4) and the upper layer casing head body (7) and outside the third metal sealing element (62).

10. The three-layer casing head with high temperature resistance and high sulfur resistance according to any one of claims 1 to 9, wherein: the metal components of the three-layer casing head with high temperature resistance and high sulfur resistance are all prepared from high temperature resistance and high sulfur resistance alloy, and the parts in contact with the medium are all formed by alloy surfacing.

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