CN217270111U - Blowout prevention diversion casing head - Google Patents

Abstract

The utility model relates to an oil exploration, development drilling engineering, coal bed gas and shale gas develop technical field, especially relate to prevent spouting water conservancy diversion casing head, including preventing spouting drilling rod, locking cover one, hexagonal pneumatic locking mechanical system, annular end cap, sleeve pipe well head seat, blowout pipeline line, kill line pipeline, manometer and choke valve. The utility model discloses a to the old district exploitation well in oil field, stratum pore pressure is clear, well head control pressure is less than 25 PMa's production well, carry out well control easy operation with preventing spouting water conservancy diversion casing head, safety and reliability, can practice thrift drilling cost 30 more ten thousand yuan, alleviate workman intensity of labour, can realize multi-level well head control, do not receive the cement height to return and influence a well head, well control operation process, can move about the drilling tool by a wide margin (the range of moving about from top to bottom is 7 meters, also can start carousel activity drilling tool), prevent to glue the card, it is sealed reliable than flashboard blowout preventer, the pressure bearing capacity, the shut-in time is short.

Description

Blowout prevention diversion casing head

Technical Field

The application relates to the technical field of petroleum exploration, development and drilling engineering, coal bed gas and shale gas development, in particular to a blowout prevention diversion casing head.

Background

At present, oil field exploration and development except a few casing heads for exploration wells, most wells are simple casing well heads made of annular iron plates, and annular pressure between an oil layer casing and a technical casing cannot be effectively controlled.

Meanwhile, when the old oil area is developed, because the pore pressure of the stratum is clear, in order to save the development cost of the oil field, a technical casing is not designed, but a deep surface layer (200-300 meters) is put in, but the well plugging devices with the grade of 35PMa are all installed, because the fracture pressure of the stratum is less than 4 PMa, the well closing casing pressure is less than 4 PMa, the well plugging devices do not play a role, the well control cost of nearly 30 more ten thousand yuan/hole of well is increased, the well plugging devices commonly used for the well drilling production at present are provided with annular well plugging devices and flashboard well plugging devices, and the pressing force grades are divided into: the annular blowout preventer is used together with a ram blowout preventer, when a high-pressure oil-gas well overflows, the annular blowout preventer is closed first and then the ram blowout preventer is closed, because the ram blowout preventer is in two semi-circles and is sealed by extruding a sealing rubber, and the sealing rubber is easy to puncture when the high-pressure blowout preventer is closed.

In order to effectively monitor and control the annular pressure between an oil layer and a technical casing, ensure the safety and controllability of an oil well wellhead and greatly reduce the well control cost, a blowout prevention diversion well control casing head is developed.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a prevent spouting water conservancy diversion casing head to solve the problem that proposes in the above-mentioned background art.

The embodiment of the application adopts the following technical scheme:

the blowout prevention diversion casing head comprises a blowout prevention drill rod, a first locking sleeve, a hexagonal pneumatic locking mechanism, an annular plug, a casing well mouth seat, a blowout pipeline, a well killing pipeline, a pressure gauge and a throttle valve, wherein two dick seals are respectively designed on inner and outer circular columns of the annular plug and are sleeved on the blowout prevention drill rod, the annular plug seat is sealed on the casing well mouth seat, and the annular plug seals the annular control of a technical casing and the blowout prevention drill rod.

Preferably, the first locking sleeve is provided with four hexagonal locking mechanisms.

Preferably, the cased well head seat is provided with a wear-resistant surface with the diameter of 225mm and a sealing surface with the diameter of 235mm, is provided with a well killing and blowout pipeline interface, is connected with a locking sleeve through a screw thread, and is provided with an annular plug seat for sealing the drill rod joint.

Preferably, the hexagonal pneumatic locking mechanism comprises a second locking sleeve, a cylinder sleeve, a spring, a spare cap, a hexagonal rod and an air path.

The embodiment of the application adopts at least one technical scheme which can achieve the following beneficial effects:

for a production well with clear formation pore pressure and well mouth control pressure less than 25PMa in an oil field old area development well, the blowout prevention diversion casing head is used for well control, so that the operation is simple, safe and reliable, and the drilling cost can be saved by more than 30 ten thousand yuan;

secondly, the pressure of an oil layer casing and the annular space of a technical casing can be effectively controlled;

thirdly, sealing the well mouth with high-quality setting;

fourthly, alleviate workman intensity of labour, can realize multi-level well head control, do not receive the cement height to return and influence a well head, well control operation process can move about the drilling tool by a wide margin (the range of motion is 7 meters from top to bottom, also can start carousel activity drilling tool), prevents to glue the card, and is sealed reliable, the pressure bearing than flashboard blowout preventer, and shut-in time is short.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is a schematic structural view of the function of the blowout prevention diversion casing head of the utility model;

fig. 2 is a schematic structural view of the blowout prevention diversion casing head assembly of the present invention;

FIG. 3 is a schematic structural view of the blowout prevention drill pipe of the present invention;

fig. 4 is a schematic structural view of the diversion sleeve head locking system of the present invention.

In the figure: 1. blowout prevention drill pipes; 2. a first locking sleeve; 3. a hexagonal pneumatic locking mechanism; 4. an annular plug; 5. a cased well head seat; 6. blowing a pipeline; 7. a kill line; 8. a pressure gauge; 9. a throttle valve; 31. a second locking sleeve; 32. a cylinder liner; 33. a spring; 34. preparing a cap; 35. a hexagonal bar; 36. and (6) air channels.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, the technical solutions of the present application will be clearly and completely described below with reference to specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only a few embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.

Referring to fig. 1, 2, 3 and 4, the blowout prevention diversion casing head comprises a blowout prevention drill rod 1, a locking sleeve I2, a hexagonal pneumatic locking mechanism 3, an annular choke plug 4, a casing well mouth seat 5, a blowout pipeline 6, a kill line 7, a pressure gauge 8 and a throttle valve 9, wherein two dick seals are respectively designed on an inner cylinder and an outer cylinder of the annular choke plug 4 and are sleeved on the blowout prevention drill rod 1, the annular choke plug 4 is seated on the casing well mouth seat 5, the annular choke plug 4 seals the annular control of a technical casing and the blowout prevention drill rod 1, the locking sleeve I2 is provided with four hexagonal locking mechanisms, the casing well mouth seat 5 is provided with a wear-resistant surface with a diameter of 225mm and a sealing surface with a diameter of 235mm, a joint of the kill line and the blowout pipeline 6 is arranged and is connected with a screw thread of the locking sleeve I2, the annular choke plug 4 is provided with a drill rod joint, and the hexagonal pneumatic locking mechanism 3 comprises a locking sleeve II 31, a cylinder sleeve 32, a spring 33, a spare cap 34, a spare cap, Hexagonal rod 35 and gas circuit 36.

When in use, a casing well mouth seat 5 is additionally connected to the uppermost casing of the surface casing or the technical casing (the casing well mouth seat 5 is a hanging seat with variable inner diameter and consists of a sealing surface and a cross joint), a joint top is used for conveying to the ground surface (the upper end surface of the casing well mouth seat 5 is flat with the ground surface), the surface casing or the technical casing is well-cemented, when overflow occurs, the annular plug 4 is connected in a robbing mode and is sealed on the casing well mouth seat 5, the pressure of a shaft is controlled through a throttle valve 9 on a blowout pipeline 6, and grout is balanced and well is pressed, so that the purpose of well control is achieved;

when the oil layer casing pipe overflows, the annular plug 4 is connected in a snatching mode and is sealed on the casing wellhead seat 5, and well control operation during casing pipe descending is achieved;

the annular plug 4 is sleeved on the last oil layer casing, and the casing is fixed and completed, namely the casing can be seated on the casing wellhead seat 5, so that wellhead operation is completed, wellhead pressure is effectively controlled, and the casing wellhead seat is convenient and flexible to operate, safe and reliable;

two dick seals are respectively designed on inner and outer circular columns of the annular plug 4 and sleeved on the blowout prevention drill rod 1, the blowout prevention drill rod 1 is lowered, the annular plug 4 is sealed on the casing wellhead seat 5, gas is supplied to the hexagonal pneumatic locking mechanism 3, the hexagonal locking rod enters the locking sleeve 2, the annular plug 4 is locked on the casing wellhead seat 5, the force of liquid column pressure difference pushing the annular plug 4 to move upwards is overcome, the annular plug 4 blocks the environment control of the technical casing and the blowout prevention drill rod 1, and the purpose of well control is achieved. Because the annular plug 4 is sleeved on the blowout prevention drill rod 1, the drilling tool can be moved up and down during well sealing, and can also be rotated, so that the drilling tool is prevented from being stuck during well sealing;

when casing is put for well completion, the throttle valve 9 is opened, the annular choke plug 4 is sleeved on the last casing and is sealed on the casing wellhead seat 5 for well cementation, and well completion and wellhead welding operation are not needed;

a transition inclined plane of a wear-resistant surface with the diameter of 225mm and a sealing surface with the diameter of 235mm is designed on the cased well head seat 5, and the annular plug 4 is sealed by the seat;

installing a casing wellhead seat 5: 81/2 ' well of 51/2 ' oil reservoir casing under well, it is recommended to select 103/4 ' surface casing, connect casing well head seat 5 on the last surface casing, send to the position of the level with the ground with the joint, fix the surface layer kill, blow-out the pipeline 6 interface with the plug, after fixing the surface layer for 10 hours, remove the plug, connect blow-out and kill the pipeline 7, finish the installation of the casing well head seat 5;

setting a well head: and sleeving an annular plug 4 on the last oil layer casing, conveying the oil layer casing into a casing wellhead seat 5 by using a joint top for 0.5 m, circulating slurry and cementing. Directly lowering the casing seat to seal on the casing wellhead seat 5 after the well cementation is finished, and disassembling the top connection joint and the bell mouth to seal the wellhead;

well control operation: in the drilling process, the annular choke plug 4 blowout prevention drill rod 1 is placed at an obvious position of a drill floor, when overflow occurs, the throttle valve 9 is opened, the blowout prevention drill rod 1 is connected in a robbed mode and is seated on the cased well mouth seat 5, air is supplied to the locking mechanism, the annular choke plug 4 is locked by the hexagonal locking rod, and control over a shaft is completed. The well killing operation is carried out according to the actions of 'four and seven' in the well control management rules, the drilling tool can be moved by 6 meters in the well killing operation process, and the rotary table can also be rotated to move the drilling tool so as to prevent sticking.

The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims (4)

1. Prevent spouting water conservancy diversion casing head, including preventing spouting drilling rod (1), locking cover (2), hexagonal pneumatic locking mechanical system (3), annular end cap (4), casing well head seat (5), blowout line (6), kill line (7), manometer (8) and choke valve (9), its characterized in that: the annular choke plug (4) is provided with two seals on inner and outer cylinders respectively and sleeved on the blowout-preventing drill rod (1), and the annular choke plug (4) is seated on the sleeve well head seat (5).

2. The flow sleeve head of claim 1, wherein: and the first locking sleeve (2) is provided with four hexagonal locking mechanisms.

3. The flow sleeve head of claim 2, wherein: the casing well mouth seat (5) is provided with a wear-resistant surface with the diameter of 225mm and a sealing surface with the diameter of 235mm, is provided with a well killing and blowout pipeline (6) interface, is connected with the locking sleeve I (2) in a threaded manner, and is provided with an annular plug (4) seat to seal a drill rod joint.

4. The flow sleeve head of claim 1, wherein: the hexagonal pneumatic locking mechanism (3) comprises a second locking sleeve (31), a cylinder sleeve (32), a spring (33), a spare cap (34), a hexagonal rod (35) and an air path (36).

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