CN111335839A - Hydraulic controllable casing head - Google Patents

Abstract

A hydraulic controllable casing head relates to petroleum machinery, a hanger (3) is in sealing connection with a casing (1) through a sealing element (4), a casing (2) is in threaded connection with the lower end of the hanger (3), a discharge channel (6) communicated with a casing head annular space (5) is vertically arranged on the upper end face of the hanger (3), a piston cavity (7) which is communicated with the discharge channel (6) in a cross way is transversely arranged on the peripheral surface of the hanger (3), a piston body (8) is arranged in the piston cavity (7) close to the outer side, an injection hole (9) communicated with the piston cavity (7) is transversely arranged on the casing (1) at a position corresponding to the piston cavity (7) of the hanger (3), and an injection connector (10) used for being connected with a hydraulic control device is arranged at the injection hole (9), the piston body (8) can be pushed to move inwards by injecting pressure into the injection hole (9), so that the discharge channel (6) is closed. The novel electric heating furnace has the advantages of simple structure, reasonable design, low manufacturing cost, good use effect and high working efficiency.

Description

Hydraulic controllable casing head

Technical Field

The invention relates to petroleum machinery, in particular to a hydraulic controllable casing head.

Background

Along with the continuous deepening of high temperature high pressure oil gas well, deep water oil gas well exploration development, unusual annular space pressure in the oil gas well pit shaft is more and more outstanding. Abnormal annular pressure in the shaft increases the load of the shaft pipe column, and the casing pipe can be subjected to dangerous accidents such as yielding damage, unstable buckling, crushing and the like under the high annular pressure load. In the process of drilling operation, in order to fix a wellhead of a drilling well, connect wellhead casing strings and seal annular spaces among all layers of casing strings, casing head transition connection is required. The upper end of the casing head is connected with a blowout preventer stack, and the lower end of the casing head is connected with a surface casing. The casing head is provided with a pressure release valve, and if the problem of abnormal annular internal return pressure of the casing occurs in the well cementation process, the annular pressure can be reduced by manually opening the pressure release valve, so that the safety of the shaft can be maintained. The manual operation pressure relief valve has low pressure reduction operation efficiency and is not beneficial to automatic production operation.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the device is used for realizing controllable hydraulic controllable casing head through hydraulic control, and communicating or closing the space of each layer of casing ring of the wellhead of the petroleum drilling well, so as to solve the defect that the abnormal annular pressure cannot be released after the conventional casing seat is sealed.

The technical solution of the invention is as follows: the utility model provides a controllable casing head of hydraulic pressure, is including being used for fixing the casing at the well head and the hanger that is used for adapter sleeve, hanger and casing pass through sealing member sealing connection, and the sleeve pipe spiro union is at the hanger lower extreme, the vertical release passage who communicates with casing head annular space that is equipped with of hanger up end, transversely be equipped with the piston chamber that alternately link up with release passage on the global of hanger, the piston body has been put to the outside in the piston chamber, the casing transversely is equipped with the notes pressure hole with piston chamber intercommunication in the piston chamber position department of corresponding with the hanger, and notes pressure hole department is equipped with the notes pressure connector that is used for being connected with hydraulic control device, can promote the piston body to the inboard removal through annotating pressure to notes pressure hole to turn-off release passage.

The invention has the technical effects that: the automatic well completion system has the advantages of simple structure, reasonable design, low manufacturing cost, good use effect and high working efficiency, can save the step of manually opening the valve to release pressure, achieves the purpose of saving time and labor, and creates powerful conditions for automatic well completion.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Detailed Description

As shown in fig. 1, a hydraulic controllable casing head comprises a casing 1 for fixing at a wellhead and a hanger 3 for connecting a casing 2, wherein the hanger 3 is hermetically connected with the casing 1 through a sealing element 4, the casing 2 is screwed at the lower end of the hanger 3, adischarge passage 6 communicated with a casing head annular space 5 is vertically arranged on the upper end face of the hanger 3, apiston cavity 7 crosswise communicated with thedischarge passage 6 is transversely arranged on the peripheral surface of the hanger 3, a piston body 8 is arranged on the inner side and the outer side of thepiston cavity 7, an injection hole 9 communicated with thepiston cavity 7 is transversely arranged on the casing 1 at a position corresponding to thepiston cavity 7 of the hanger 3, aninjection connection head 10 for connecting with a hydraulic control device is arranged at the injection hole 9, and the injection hole 9 can push the piston body 8 to move to the inner side so as to close thedischarge passage 6.

Thedischarge passage 6 is a plurality of, be equipped with annular 11 on the global of hanger 3 and communicate each other thepiston chamber 7 ofdischarge passage 6, the upper and lower below of annular 11 is sealed through sealing member 4, can annotate to eachpiston chamber 7 simultaneously through annotating pressure hole 9 and press.

The sealing element 4 is an O-shaped sealing ring.

And a thread for connecting asealing plug 12 is arranged at the upper opening of thedischarge channel 6 of the hanger 3, and the thread is used for further plugging thedischarge channel 6 through thesealing plug 12 after well completion.

The housing 1 is provided with apressure relief valve 13.

Thepressure relief valve 13 is a ball valve.

The casing is connected with the end part of the surface casing through lower end threads, the hanger is arranged in the casing and sealed with the casing head casing through a conical surface, the lower end of the hanger is connected with an oil layer casing, a discharge hole is processed on the upper end face of the hanger and communicated with the annular space of the casing head, a discharge channel can be closed through a piston valve, the piston valve is pre-installed in a flange of the casing in an initial state and is in an open state, a sealing plug of the discharge channel of the hanger is removed, the annular space of the casing head is communicated with an upper blowout preventer through the discharge channel, the pressure of the annular space of the surface casing and the oil layer casing is controllable, after well cementing operation is completed, a hydraulic pipeline is connected at a well head and applies pressure, the piston.

Claims (6)

1. A hydraulic controllable casing head comprises a casing (1) fixed at a wellhead and a hanger (3) used for connecting a casing (2), wherein the hanger (3) is in sealing connection with the casing (1) through a sealing element (4), the casing (2) is in threaded connection with the lower end of the hanger (3), the hydraulic controllable casing head is characterized in that a discharge channel (6) communicated with a casing head annular space (5) is vertically arranged on the upper end face of the hanger (3), a piston cavity (7) communicated with the discharge channel (6) in a cross mode is transversely arranged on the peripheral face of the hanger (3), a piston body (8) is arranged on the inner side and the outer side of the piston cavity (7), an injection hole (9) communicated with the piston cavity (7) is transversely arranged at a position corresponding to the piston cavity (7) of the hanger (3) of the casing (1), and an injection connector (10) used for being connected with a hydraulic control device is arranged at the injection hole (9), the piston body (8) can be pushed to move inwards by injecting pressure into the injection hole (9), so that the discharge channel (6) is closed.

2. The hydraulically controllable casing head as claimed in claim 1, characterized in that the relief channel (6) is provided in plurality, the suspension (3) is provided with a circumferential groove (11) on its circumferential surface for interconnecting the piston chambers (7) of the relief channel (6), the upper and lower sides of the circumferential groove (11) are sealed by a sealing element (4), and the piston chambers (7) can be simultaneously injected with pressure through the injection holes (9).

3. The hydraulically controllable casing head as claimed in claim 2, characterized in that the seal (4) is an O-ring seal.

4. The hydraulically controllable casing head as claimed in claim 1, characterized in that the upper opening of the drainage channel (6) of the hanger (3) is provided with a thread for connecting a sealing plug (12) for further sealing off the drainage channel (6) by means of the sealing plug (12) after completion of the well.

5. A hydraulically controllable casing head according to claim 1, 2, 3 or 4, characterized in that the housing (1) is provided with a pressure relief valve (13).

6. A hydraulically controllable casing head according to claim 5, characterized in that the pressure relief valve (13) is a ball valve.

Images