CN106050218B

CN106050218B - Annulus testing wellhead device for operation under pressure

Info

Publication number: CN106050218B
Application number: CN201610559280.9A
Authority: CN
Inventors: 申玉壮; 高亮; 王海涛; 邹伟
Original assignee: ENGINEERING TECHNOLOGY Co OF XINJIANG PETROLEUM ADMINISTRATION BUREAU; China National Petroleum Corp
Current assignee: ENGINEERING TECHNOLOGY Co OF XINJIANG PETROLEUM ADMINISTRATION BUREAU; China National Petroleum Corp
Priority date: 2016-07-15
Filing date: 2016-07-15
Publication date: 2023-04-07
Anticipated expiration: 2036-07-15
Also published as: CN106050218A

Abstract

The invention relates to the technical field of under-pressure testing devices, in particular to an under-pressure operation annulus testing wellhead device which comprises a connecting shell and a double-pipe rotating core, wherein an inner annular lug is arranged on the inner side of the lower part of the connecting shell, an outer concave table corresponding to the inner part and the outer part of the inner annular lug is arranged on the outer side of the lower part of the double-pipe rotating core, a double-pipe rotating core seat above the outer concave table is arranged on the inner annular lug, the outer side of the double-pipe rotating core is hermetically installed with the inner side of the connecting shell, the upper end of the double-pipe rotating core is positioned above the connecting shell, and a rotating core flange capable of preventing the double-pipe rotating core from moving upwards is fixedly installed on the connecting shell. The invention has reasonable and compact structure and convenient use, can plug an oil pipe, install a blowout preventer and pull out the oil pipe column in a pressurized state, is convenient for later maintenance of production tools such as the oil pipe column and the like, and does not need to adopt a well killing mode for later maintenance, thereby avoiding the damage of well killing on the oil displacement effect and effectively protecting an oil layer.

Description

Annulus testing wellhead device for operation under pressure

Technical Field

The invention relates to the technical field of under-pressure testing devices, in particular to an under-pressure operation annulus testing wellhead device.

Background

With the continuous improvement and development of the underground operation technology, the well repairing mode of the pressurized operation becomes the development direction of the future underground operation. For the well conditions that a chemical flooding or compound flooding process development block with low formation pressure is not suitable for being controlled by killing well operation, the under-pressure operation shows more superiority and necessity, the annular space testing wellhead tool applied to the field of the oil field at present can meet the operation functions of conventional testing, oil pumping and the like, but the later maintenance (the maintenance of drilling tools, such as the maintenance of oil tubing columns and oil well pumps and the like) can only be realized by the conventional killing well operation mode, and the killing well not only destroys the oil displacement effect, but also has certain influence on the oil layer.

Disclosure of Invention

The invention provides an annulus testing wellhead device for under-pressure operation, which overcomes the defects of the prior art and can effectively solve the problem that the prior annulus testing wellhead tool needs to carry out the well-pressure operation in the later maintenance process.

The technical scheme of the invention is realized by the following measures: the utility model provides a pressure operation annular testing wellhead assembly, including connecting the casing and double-barrelled core that changes, there is interior annular lug in the lower part inboard of connecting the casing, there is the outer concave station that corresponds with interior annular lug inside and outside the lower part outside of double-barrelled core that changes, the double-barrelled core seat that changes of outer concave station top is on including annular lug, the outside of double-barrelled core that changes is in the same place with the inboard sealing installation of connecting the casing, the upper end that double-barrelled core that changes is located the top of connecting the casing, fixed mounting has the core flange that changes that can prevent double-barrelled core that changes to shift up on connecting the casing, from a left side and the right side have vice tube hole and the person in charge hole that link up from top to bottom on double-barrelled core that changes, there is the plug valve at vice tube hole fixed mounting, be responsible for hole fixed mounting and have self-aligning packing centering box.

The following is further optimization or/and improvement of the technical scheme of the invention:

at least one radial through hole is distributed on the upper part of the connecting shell along the circumference, a radial groove corresponding to the inside and the outside of the radial through hole is arranged on the double-tube rotating core, a jackscrew is hermetically arranged in the radial through hole, and the inner end of the jackscrew is tightly propped in the radial groove.

The outer side of the lower part of the inner annular lug is fixedly provided with an inner lug, a mounting cavity is formed between the upper part of the inner annular lug and the upper part of the outer concave table, a bearing is installed in the mounting cavity, a limiting blind hole is formed in the double-tube rotating core corresponding to the inner part and the outer part of the upper part of the inner annular lug, a limiting screw is fixedly installed in the limiting blind hole, and the outer end of the limiting screw is located at the top end of the inner lug.

At least one radial flow hole is distributed in the middle of the double-tube rotating core along the circumference, a radial fixing hole corresponding to the inside and the outside of the radial flow hole is arranged in the middle of the connecting shell, and a pressure relief pipe is fixedly arranged in the radial fixing hole.

At least one sealing ring is fixedly mounted between the rotating core flange on the outer side of the double-pipe rotating core and the connecting shell, at least one sealing ring is fixedly mounted between the outer side of the upper end of the double-pipe rotating core and the inner side of the rotating core flange, at least one sealing ring is fixedly mounted between the outer side of the double-pipe rotating core above the radial flow hole and the inner side of the connecting shell, at least one sealing ring is fixedly mounted between the outer side of the double-pipe rotating core between the radial flow hole and the bearing and the inner side of the connecting shell, and at least one sealing ring is fixedly mounted between the lower part of the outer concave platform and the inner side of the inner convex block.

The outer side of the double-barrelled core that changes that the aforesaid is adjacent with changeing the core flange has the spacing frustum that is interior upper and lower slope form, changes the core flange card on the upper portion of spacing frustum, changes the core flange and passes through bolt and nut fixed mounting with the connecting shell together, is fixed with the connecting plate in the lower extreme outside of connecting the casing, has the connecting hole along circumference interval distribution on the connecting plate, and the plug valve passes through loose joint fixed mounting on vice tube hole, and fixed mounting has the union on the plug valve.

The invention has reasonable and compact structure and convenient use, can plug an oil pipe, install a blowout preventer and pull out the oil pipe column in a pressurized state, is convenient for later maintenance of production tools such as the oil pipe column and the like, and does not need to adopt a well killing mode for later maintenance, thereby avoiding the damage of well killing on the oil displacement effect and effectively protecting an oil layer.

Drawings

FIG. 1 is a schematic sectional view of the preferred embodiment of the present invention in a front view.

The codes in the figures are respectively: 1 is the connecting shell, 2 is double-barrelled commentaries on classics core, 3 is interior annular lug, 4 is changeing the core flange, 5 is the auxiliary pipe hole, 6 is the main pipe hole, 7 is the plug valve, 8 is the aligning packing box, 9 is the jackscrew, 10 is interior convex block, 11 is the bearing, 12 is stop screw, 13 is radial flow hole, 14 is the pressure release pipe, 15 is the sealing washer, 16 is the union, 17 is the union, 18 is the connecting hole, 19 is the connecting plate, 20 is the back valve, 21 is spacing frustum.

Detailed Description

The present invention is not limited by the following examples, and specific embodiments may be determined according to the technical solutions and practical situations of the present invention.

In the present invention, for convenience of description, the description of the relative positional 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 fig. 1 of the specification.

The invention is further described with reference to the following examples and figures:

as shown in the attached figure 1, the annulus testing wellhead device for the operation under pressure comprises a connecting shell 1 and a double-pipe rotating core 2, an inner annular convex block 3 is arranged on the inner side of the lower portion of the connecting shell 1, an outer concave table corresponding to the inner annular convex block 3 is arranged on the outer side of the lower portion of the double-pipe rotating core 2, the double-pipe rotating core 2 above the outer concave table is seated on the inner annular convex block 3, the outer side of the double-pipe rotating core 2 is hermetically mounted with the inner side of the connecting shell 1, the upper end of the double-pipe rotating core 2 is located above the connecting shell 1, a rotating core flange 4 capable of preventing the double-pipe rotating core 2 from moving upwards is fixedly mounted on the connecting shell 1, an auxiliary pipe hole 5 and a main pipe hole 6 which are communicated up and down are arranged on the double-pipe rotating core 2 from left to right, a plug valve 7 is fixedly mounted on the auxiliary pipe hole 5, and an aligning packing box 8 is fixedly mounted on the main pipe hole 6. In the process of using the invention, the oil pipe can be plugged, the blowout preventer can be installed and the oil pipe column can be pulled down under the pressure state, so that the later maintenance of production tools such as the oil pipe column and the like is convenient, and the later maintenance is not required to be carried out by adopting a well killing mode, thereby avoiding the damage of the well killing to the oil displacement effect and effectively protecting an oil layer. The aligning packing box 8 is the prior known technology.

According to actual needs, the annulus testing wellhead device for the under-pressure operation can be further optimized or/and improved:

as shown in the attached figure 1, at least one radial through hole is circumferentially distributed on the upper part of the connecting shell 1, a radial groove corresponding to the inside and the outside of the radial through hole is arranged on the double-tube rotating core 2, a jackscrew 9 is hermetically arranged in the radial through hole, and the inner end of the jackscrew 9 is tightly propped in the radial groove. The jackscrew 9 has further limiting function to the double-tube rotary core 2, and contributes to the operation under pressure of the invention.

As shown in fig. 1, an inner convex block 10 is fixed on the outer side of the lower part of the inner annular convex block 3, a mounting cavity is formed between the upper part of the inner annular convex block 3 and the upper part of the outer concave table, a bearing 11 is installed in the mounting cavity, a limiting blind hole is formed on the double-tube rotary core 2 corresponding to the inner part and the outer part of the upper part of the inner annular convex block 3, a limiting screw 12 is fixedly installed in the limiting blind hole, and the outer end of the limiting screw 12 is seated on the top end of the inner convex block 10. Stop screw 12 can take out bearing 11 together smoothly when lifting double-barrelled commentaries on classics core 2, is convenient for maintain bearing 11, has further guaranteed going on smoothly of later maintenance operation.

As shown in fig. 1, at least one radial flow hole 13 is circumferentially distributed in the middle of the double-pipe rotary core 2, a radial fixing hole corresponding to the inside and the outside of the radial flow hole 13 is formed in the middle of the connecting shell 1, and a pressure relief pipe 14 is fixedly installed in the radial fixing hole.

As shown in fig. 1, at least one sealing ring 15 is fixedly installed between the rotary core flange 4 at the outer side of the double-pipe rotary core 2 and the connecting shell 1, at least one sealing ring 15 is fixedly installed between the outer side of the upper end of the double-pipe rotary core 2 and the inner side of the rotary core flange 4, at least one sealing ring 15 is fixedly installed between the outer side of the double-pipe rotary core 2 above the radial flow hole 13 and the inner side of the connecting shell 1, at least one sealing ring 15 is fixedly installed between the outer side of the double-pipe rotary core 2 between the radial flow hole 13 and the bearing 11 and the inner side of the connecting shell 1, and at least one sealing ring 15 is fixedly installed between the lower part of the outer concave table and the inner side of the inner convex block 10. The arrangement of the sealing ring 15 can ensure the sealing performance of the invention in the process of belt pressing operation.

As shown in the attached figure 1, the outer side of a double-pipe rotary core 2 adjacent to a rotary core flange 4 is provided with a limiting frustum 21 which is inclined from inside to outside, the rotary core flange 4 is clamped on the upper part of the limiting frustum 21, the rotary core flange 4 and a connecting shell 1 are fixedly installed together through bolts and nuts, the outer side of the lower end of the connecting shell 1 is fixedly provided with a connecting plate 19, connecting holes 18 are distributed on the connecting plate 19 at intervals along the circumference, a plug valve 7 is fixedly installed on an auxiliary pipe hole 5 through a movable joint 16, and a union 17 is fixedly installed on the plug valve 7. When the core rotating flange 4 is clamped on the limiting frustum 21, the double-tube rotating core 2 can be prevented from moving upwards.

The above technical features constitute the best embodiment of the present invention, which has strong adaptability and best implementation effect, and unnecessary technical features can be increased or decreased according to actual needs to meet the requirements of different situations.

The application process of the preferred embodiment of the invention is as follows: the invention is connected with an aboveground tool through a connecting plate 19, when in normal production, a main pipe hole 6 is provided with a tubing string, an oil well pump is hung below the tubing string for oil extraction, an auxiliary pipe hole 5 can be put into a testing tool, the testing tool dynamically monitors factors such as well bore annular pressure, media and the like, when in production state under pressure operation is required, a tubing plug is put into the tubing string to complete tubing plug, after a plug valve 7 is closed, the rotating core flange 4 and tools above the rotating core flange 4 are disassembled, then, a double-gate blowout preventer, a blowout preventer and an under pressure operation device are connected on a connecting shell 1 through a fixed installation eccentric conversion flange, then a jackscrew 9 is loosened, the double-tube rotating core 2 and the tubing string are lifted up and the tools connected with the tubing string are maintained, then, under pressure operation is carried out, after under pressure operation is finished, the tubing string is firstly put down, the double-tube rotating core 2 is seated in the connecting shell 1, the jackscrew 9 is tightened, the under pressure operation device is disassembled, the rotating core 4 and the fixing tool above the rotating core flange 4 is installed on the connecting shell to recover the production shell. As shown in fig. 1, the rear valve 20 at the rear of the self-aligning packing box 8 rotates 90 degrees clockwise and then rotates to the right of the self-aligning packing box 8.

Claims

1. The annular testing wellhead device for the under-pressure operation is characterized by comprising a connecting shell and a double-pipe rotating core, wherein an inner annular convex block is arranged on the inner side of the lower part of the connecting shell, an outer concave table which corresponds to the inner side and the outer side of the lower part of the double-pipe rotating core is arranged on the outer side of the lower part of the double-pipe rotating core, a double-pipe rotating core seat above the outer concave table is arranged on the inner annular convex block, the outer side of the double-pipe rotating core is hermetically mounted with the inner side of the connecting shell, the upper end of the double-pipe rotating core is positioned above the connecting shell, a rotating core flange capable of preventing the double-pipe rotating core from moving upwards is fixedly mounted on the connecting shell, an auxiliary pipe hole and a main pipe hole which are vertically communicated are formed in the double-pipe rotating core from left to right, a plug valve is fixedly mounted in the auxiliary pipe hole, and an aligning packing box is fixedly mounted in the main pipe hole; at least one radial through hole is distributed on the upper part of the connecting shell along the circumference, a radial groove corresponding to the inside and the outside of the radial through hole is arranged on the double-pipe rotating core, a jackscrew is hermetically arranged in the radial through hole, and the inner end of the jackscrew is tightly propped in the radial groove; an inner convex block is fixed on the outer side of the lower part of the inner annular convex block, an installation cavity is formed between the upper part of the inner annular convex block and the upper part of the outer concave table, a bearing is installed in the installation cavity, a limiting blind hole is formed in the double-tube rotating core corresponding to the inner part and the outer part of the upper part of the inner annular convex block, a limiting screw is fixedly installed in the limiting blind hole, and the outer end seat of the limiting screw is arranged at the top end of the inner convex block; at least one radial flow hole is circumferentially distributed in the middle of the double-pipe rotating core, a radial fixing hole corresponding to the inside and the outside of the radial flow hole is formed in the middle of the connecting shell, and a pressure relief pipe is fixedly installed in the radial fixing hole; the outer side of a double-pipe rotary core adjacent to the rotary core flange is provided with a limiting frustum which is internally inclined, the rotary core flange is clamped on the upper part of the limiting frustum, the rotary core flange and a connecting shell are fixedly installed together through a bolt and a nut, a connecting plate is fixed on the outer side of the lower end of the connecting shell, connecting holes are distributed on the connecting plate at intervals along the circumference, the plug valve is fixedly installed on an auxiliary pipe hole through a movable joint, and a union is fixedly installed on the plug valve.