CN212614622U

CN212614622U - Dual-purpose casing head for thin and thick oil

Info

Publication number: CN212614622U
Application number: CN202021244522.3U
Authority: CN
Inventors: 康克利; 张武涛; 杜彤; 孙新浩; 左建川; 赵益书
Original assignee: China National Petroleum Corp; CNPC Xibu Drilling Engineering Co Ltd
Current assignee: China National Petroleum Corp; CNPC Xibu Drilling Engineering Co Ltd
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2021-02-26
Anticipated expiration: 2030-06-30

Abstract

The utility model relates to a petroleum industry well drilling wellhead assembly technical field, concretely relates to rare, dual-purpose casing head of viscous crude, including the sleeve pipe body, the hanger, connect the nipple joint, bearing ring and seal cover, hanger outside cover is equipped with the sleeve pipe body, sleeve pipe body inboard is equipped with down the ring platform, the hanger is located down the ring platform, the hanger upper end is equipped with the connecting ring platform, threaded connection has the bearing ring on the connecting ring platform, be equipped with the runner on the up end of hanger, the bearing ring lower part is equipped with first spacing ring platform, it is equipped with the spacing ring platform of second to connect nipple joint upper portion, connect nipple joint upper end fixedly connected with ring flange, fixed intercommunication has bypass nipple joint on the sleeve pipe body. The utility model discloses a connection nipple joint and bearing ring are with hanger fixed mounting in the sleeve pipe body, guarantee that the hanger sits completely and hangs and target in place, through add the runner on the hanger, reduce the internal pressure to solve the problem of pressing the hourglass stratum.

Description

Dual-purpose casing head for thin and thick oil

Technical Field

The utility model relates to a petroleum industry well drilling wellhead assembly technical field, concretely relates to dual-purpose casing head of rare, viscous crude.

Background

In the process of petroleum exploration and development, part of blocks are subjected to water injection and multi-element compound flooding development for many years, the physical properties of strata are greatly changed, part of strata are voided, geological complex conditions such as well leakage and the like easily occur in the process of well drilling and well cementation, the casing head structure used by the existing well head is generally of a mandrel type or a slip type, the first part requires pulling and well cementation during well cementation, the well head is flushed after the displacement is finished, the displacement of the general well cementation is small, the pressure in the well is high, the strata are easy to leak, and in addition, the bypass pipelines on the two sides of the body need to be disassembled for flushing the well head, so that the time is wasted, the pipe string is easy to drop, the hanger cannot be completely hung in place, and the post-treatment is also difficult.

Disclosure of Invention

The utility model provides a dual-purpose casing head of rare, viscous crude has overcome above-mentioned prior art not enough, and the hanger that exists in its ability effective solution current casing head use can not sit completely hang the problem of target in place, easily pressing the hourglass stratum when cementing.

The technical scheme of the utility model is realized through following measure: a dual-purpose casing head for thin and thick oil comprises a casing body, a hanger, a connecting short section, a pressure-bearing ring and a sealing sleeve, wherein the casing body is sleeved outside the hanger, a lower ring platform is arranged on the inner side of the casing body corresponding to the position of the outer side of the lower end of the hanger, the top surface of the lower ring platform is in a reversed frustum shape with a wide upper part and a narrow lower part, the outer side of the lower end of the hanger is in a reversed frustum shape with a wide upper part and a narrow lower part matched with the top surface of the lower ring platform, the hanger is arranged on the top surface of the lower ring platform, the inner side of the upper end of the hanger is provided with the connecting ring platform, the outer side of the upper end of the connecting ring platform is in threaded connection with the pressure-bearing ring with the lower end seat on the upper end surface of the hanger, a vertically through flow channel is arranged on the upper end surface of the hanger corresponding to the position of the pressure-, the flange plate used for being connected with a flange at the bottom of the Christmas tree is fixedly connected with the outer side of the upper end of the connecting short section, the outer side of the lower end of the sealing sleeve is in threaded connection with the inner side of the upper end of the hanger, and the bypass short section is fixedly communicated with the sleeve body corresponding to the position below the lower ring platform.

The following are further optimization or/and improvement of the technical scheme of the utility model:

the outer side of the sealing sleeve corresponding to the position above the connecting ring platform can be provided with an outer ring platform, the lower end face of the outer ring platform is contacted with the upper end face of the connecting ring platform, a first sealing ring is arranged between the outer side of the outer ring platform and the inner side of the bearing ring, and the upper end face of the sealing sleeve is provided with an installation screw hole.

And a gate valve can be fixedly arranged on the bypass short section.

A second sealing ring can be arranged between the outer side of the lower end of the hanger and the inner side of the casing pipe body.

The outer side of the upper end of the casing body can be provided with a third sealing ring which can form sealing with the inner side of the lower end of the drilling bi-pass flange.

The upper end surface of the hanger can be higher than the upper end surface of the sleeve body.

The utility model has the advantages of reasonable and compact structure, convenient to use through add the runner on the hanger, reduces the well internal pressure when cementing to the condition of pressure leakage stratum takes place when preventing the well cementation, and need not to carry the pipe string during the well cementation, can not appear leading to the hanger to sit the condition of hanging not arriving because of transferring the pipe string difficulty.

Drawings

Fig. 1 is a schematic sectional view of the preferred embodiment of the present invention.

Fig. 2 is a schematic view of the cross-sectional structure of the best embodiment of the present invention before the installation of the bearing ring in the second-open well cementing process.

The codes in the figures are respectively: the device comprises a casing body 1, a hanger 2, a connecting short section 3, a pressure-bearing ring 4, a sealing sleeve 5, an outer ring platform 6, a lower ring platform 7, a connecting ring platform 8, a flow channel 9, a first limiting ring platform 10, a second limiting ring platform 11, an installation screw hole 12, a flange plate 13, a first sealing ring 14, a second sealing ring 15, a third sealing ring 16, a double-male short section 17, a bypass short section 18, a gate valve 19, a drilling double-pass flange 20 and a feeding short section 21.

Detailed Description

The utility model discloses do not receive the restriction of following embodiment, can be according to the utility model discloses a technical scheme and actual conditions determine concrete implementation.

In the present invention, for convenience of description, the description of the relative position relationship of the components is described according to the layout pattern of fig. 1 of the specification, such as: the positional relationship of front, rear, upper, lower, left, right, etc. is determined in accordance with the layout direction of the drawings of the specification.

The invention will be further described with reference to the following examples and drawings:

as shown in attached figures 1 and 2, the casing head for thin oil and thick oil comprises a casing body 1, a hanger 2, a connecting short section 3, a pressure-bearing ring 4 and a sealing sleeve 5, wherein the casing body 1 is sleeved outside the hanger 2, a lower ring platform 7 is arranged on the inner side of the casing body 1 corresponding to the outer side position of the lower end of the hanger 2, the top surface of the lower ring platform 7 is in a reversed cone platform shape with a wide upper part and a narrow lower part, the outer side of the lower end of the hanger 2 is in a reversed cone platform shape with a wide upper part and a narrow lower part matched with the top surface of the lower ring platform 7, the hanger 2 is seated on the top surface of the lower ring platform 7, the inner side of the upper end of the hanger 2 is provided with a connecting ring platform 8, the outer side of the connecting ring platform 8 is in threaded connection with the pressure-bearing ring 4 with the lower end seated on the upper end surface of the hanger 2, the upper end surface of the hanger 2 corresponding to the position of the pressure-bearing ring, the inboard second spacing ring platform 11 that is equipped with the lower end seat on first spacing ring platform 10 of 3 upper portions of connection nipple joint, 3 upper end outside fixedly connected with of connection nipple joint be used for with the flange dish 13 of production tree end flange joint, 5 lower extreme outside threaded connection of seal cover are inboard in the 2 upper ends of hanger, correspond and fixedly communicate on the sleeve pipe body 1 of 7 below positions of lower ring platform has bypass nipple joint 18. When the first cementing well is to be coagulated, the joint on the surface casing is taken down, then the connection short section 3, the pressure-bearing ring 4 and the hanger 2 are taken down from the casing body 1, the sealing sleeve 5 on the hanger 2 is taken down, the inner side of the lower end of the hanger 2 is in threaded connection with the double-male short section 17, the inner side of the upper end of the hanger 2 is in threaded connection with the feed short section 21, the lower end of the casing body 1 is connected with the surface casing, the upper end of the casing body is in threaded connection with the drilling double-way flange 20, then the hanger 2 and the double-male short section 17 are integrally fed into the casing body 1 through the feed short section 21, the hanger 2 is seated on the top surface of the lower annular table 7, the hanger 2 is hung in place, the upper end of the feed short section 21 is connected with a cement head for supplying cementing well, the upper end of the drilling double-way flange 20 is connected with a circulation pipeline, the bypass short section 18 is connected with the, excess cement slurry and clean water flow into a circulation pipeline through a bypass short section 18, when the discharge capacity is large, the cement slurry and the clean water can enter the circulation pipeline through a flow channel 9 on a hanger 2 through a drilling bi-pass flange 20, so that the pressure in a well is reduced, the stratum is prevented from being pressed and leaked, after two-time well cementation is waited for coagulation, a feeding short section 21 and the drilling bi-pass flange 20 are disassembled, a pressure-bearing ring 4 is fixedly arranged on the outer side of a connecting ring platform 8, the pressure-bearing ring 4 blocks the flow channel 9 on the hanger 2, a connecting short section 3 is fixedly arranged on the outer side of a casing body 1, a second limiting ring platform 11 of the connecting short section 3 is seated on a first limiting ring platform 10 of the pressure-bearing ring 4, the hanger 2 is positioned, the position of the whole pipe string is ensured to be fixed, and finally a sealing; if the thin oil is exploited, the flange plate 13 is directly connected with a flange at the bottom of the thin oil production tree; if thick oil position exploitation is carried out, before the connecting short section 3 is fixedly installed on the outer side of the casing body 1, the gap between the outer side of the hanger 2 and the inner side of the casing body 1 and the gap between the upper end of the hanger 2 and the lower end of the pressure-bearing ring 4 need to be subjected to sealing welding, then the connecting short section 3 is fixedly installed on the outer side of the casing body 1, and finally the flange plate 13 is connected with a thick oil production tree bottom flange to carry out thick oil exploitation operation. The utility model discloses an add runner 9 on hanger 2, the internal pressure in the well when reducing the well cementation to the condition of leaking the stratum takes place when preventing the well cementation, and need not to carry the pipe string during the well cementation, can not appear because of transferring the pipe string difficulty and lead to hanger 2 to sit the condition of hanging not arriving the position.

The first embodiment can be further optimized or/and improved according to actual needs:

as shown in the attached drawing 1, an outer ring table 6 is arranged on the outer side of the sealing sleeve 5 corresponding to the position above the connecting ring table 8, the lower end face of the outer ring table 6 is in contact with the upper end face of the connecting ring table 8, a first sealing ring 14 is arranged between the outer side of the outer ring table 6 and the inner side of the pressure-bearing ring 4, and an installation screw hole 12 is arranged on the upper end face of the sealing sleeve 5. Seal through the clearance of first sealing washer 14 between to seal cover 5 and the bearing ring 4, strengthen the utility model discloses a mechanical seal nature through set up installation screw 12 on seal cover 5, is convenient for install the spanner card and goes into to install seal cover 5 on hanger 2 in installation screw 12.

As shown in fig. 1 and 2, a gate valve 19 is fixedly mounted on the bypass nipple 18. When in use, the circulation pipeline is connected to the gate valve 19.

As shown in fig. 1 and 2, a second sealing ring 15 is arranged between the outer side of the lower end of the hanger 2 and the inner side of the casing body 1. Seal up through the clearance between second sealing washer 15 to sleeve pipe body 1 and hanger 2, can strengthen the utility model discloses a mechanical seal nature.

As shown in figure 2, the outer side of the upper end of the casing body 1 is provided with a third sealing ring 16 which can form a seal with the inner side of the lower end of the drilling double-pass flange 20. Well drilling bi-pass flange 20 installs in the sleeve pipe body 1 upper end outside during the use, seals up the clearance of well drilling bi-pass flange 20 and sleeve pipe body 1 through third sealing washer 16, strengthens the utility model discloses a mechanical seal nature.

As shown in fig. 1, the upper end surface of the hanger 2 is higher than the upper end surface of the casing body 1. The upper end face of the hanger 2 is higher than the upper end face of the casing body 1, so that the gap between the hanger 2 and the casing body 1 is conveniently sealed and welded during thick oil exploitation.

Above technical feature constitutes the utility model discloses a best embodiment, it has stronger adaptability and best implementation effect, can increase and decrease unnecessary technical feature according to actual need, satisfies the demand of different situation.

Claims

1. A dual-purpose casing head for thin and thick oil is composed of casing body, hanger, connecting short segment, pressure-bearing ring and sealing sleeve, the casing body sleeved outside the hanger, lower ring platform on the inner side of casing body, the inverted frustum with wide top and narrow bottom, the pressure-bearing ring with lower end on the upper end of hanger, the flow channel between upper and lower parts of hanger, the first limiting ring platform on the lower part of pressure-bearing ring, the second limiting ring platform on the first limiting ring platform, the flange plate used for being connected with a flange at the bottom of the Christmas tree is fixedly connected with the outer side of the upper end of the connecting short section, the outer side of the lower end of the sealing sleeve is in threaded connection with the inner side of the upper end of the hanger, and the bypass short section is fixedly communicated with the sleeve body corresponding to the position below the lower ring platform.

2. The dual-purpose casing head for thin oil and thick oil as claimed in claim 1, wherein an outer ring table is disposed on the outer side of the sealing sleeve corresponding to the position above the connecting ring table, the lower end surface of the outer ring table contacts with the upper end surface of the connecting ring table, a first sealing ring is disposed between the outer side of the outer ring table and the inner side of the pressure-bearing ring, and an installation screw hole is disposed on the upper end surface of the sealing sleeve.

3. The dual-purpose casing head for thin oil and thick oil as claimed in claim 1 or 2, wherein the bypass short section is fixedly provided with a gate valve.

4. The dual-purpose casing head of thin and thick oil according to claim 1 or 2, wherein a second sealing ring is arranged between the outer side of the lower end of the hanger and the inner side of the casing body.

5. The dual-purpose casing head for thin and thick oil of claim 3, wherein a second sealing ring is arranged between the outer side of the lower end of the hanger and the inner side of the casing body.

6. The dual-purpose casing head of thin oil and thick oil according to claim 1, 2 or 5, characterized in that the outer side of the upper end of the casing body is provided with a third sealing ring which can form a seal with the inner side of the lower end of the drilling bi-pass flange.

7. The dual-purpose casing head for thin oil and thick oil according to claim 3, wherein a third sealing ring capable of forming a seal with the inner side of the lower end of the drilling bi-pass flange is arranged on the outer side of the upper end of the casing body.

8. The dual-purpose casing head for thin oil and thick oil according to claim 4, wherein a third sealing ring capable of forming a seal with the inner side of the lower end of the drilling two-way flange is arranged on the outer side of the upper end of the casing body.

9. The dual-purpose casing head of claim 1, 2, 5, 7 or 8, wherein the upper end surface of the hanger is higher than the upper end surface of the casing body.