CN201236664Y

CN201236664Y - Special shaft mouth apparatus of thick oil thermal production well

Info

Publication number: CN201236664Y
Application number: CNU2008201090556U
Authority: CN
Inventors: 李熠; 惠卉
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-07-04
Filing date: 2008-07-04
Publication date: 2009-05-13
Anticipated expiration: 2018-07-04

Abstract

The utility model relates to a special type well mouth device for a heavy oil thermal recovery well. The device adopts a non-body design, and comprises a control joint, a lock ring, a tension rod, a slip, a thrust piston, a hanger, a communicating pipe, a compressing spring and a seal ring; threads are designed at the upper end of the interior of the control joint and can be connected with an oil recovery bottom flange; a step is designed at the lower end of the interior of the control joint to press the top part of an oil well casing, thereby controlling the elongation of the oil well casing; the hanger is mounted below a coupling of the oil well casing; components such as the slip, the thrust piston and the communicating pipe are mounted on corner bars on the outer side of the hanger; and as the thrust piston pushes the slip to move upwards along a conical surface and to expand tightly, the oil well casing is fixedly hung on the inner wall of a surface layer casing. Since the oil well casing is hung inside the surface layer casing, the utility model has the advantages of avoiding changing the prior process flow, facilitating the field operation and eliminating the occurrence of the accident in terms of stratum leakage due to overhigh well mouth back pressure caused by small flow area nearby.

Description

The extraordinary wellhead assembly of a kind of thick oil thermal extraction

Technical field

The utility model relates to a kind of extraordinary wellhead assembly of thick oil thermal extraction that is used for field produces, belongs to field of mechanical technique.

Background technology

At present, the on-the-spot thick oil thermal production well mouth device that uses hangs oil well casing when all adopting custom-designed body to connect drilling well well head and surface pipe and completion, exists: 1, complex structure is coupled to each other difficult disadvantage; 2, hanger will show the sealing of cover annular space when well cementation, and mud and cement paste can only circulate by the bypass on the body, owing to the area of passage of bypass is less, cause wellhead back pressure too high, easily suppress Lou the stratum and cause leakage, influence cementing quality; 3, owing to changed circulating path, need additionally connect pipeline and circulation pump, increase labour intensity and operating cost at well head.

Summary of the invention

The purpose of this utility model is to provide a kind of thick oil thermal extraction extraordinary wellhead assembly, it adopts no body design, in surface pipe, hang oil well casing, need not to change existing technological process, be convenient to execute-in-place, eliminated because of the bypass area of passage is little, easily caused wellhead back pressure too high and suppress the Lou generation of stratum accident.

The utility model by control joint 1, pressure ring 2, pull bar 3, slips 4, thrust piston 5, hanger 6, communicating pipe 7, holddown spring 9, and sealing ring 10 etc. form.It is characterized in that: the inner upper end design of control joint 1 has screw thread, can be connected with the end flange that recovers the oil, control joint 1 utilizes the screw thread of its outside lower end and table cover box cupling 12 to link, realization is to the control of oil well casing elongation, hanger 6 is sleeved on the below of oil well casing box cupling 8, be fixedly connected with the box cupling 8 of oil well casing by pressure ring 2, pull bar 3, be equipped with on hanger 6 outside ribs slips 4, thrust piston 5 and communicating pipes 7 assembly, slips 4 is fixed on by holddown spring 9 on the conical surface of hanger 6, and sealing ring 10 is housed on the thrust piston 5.

The utility model hangs oil well casing owing to adopt no body design in surface pipe, eliminated because of the bypass area of passage is little, easily causes wellhead back pressure too high and easily suppress the Lou generation of stratum accident, and is convenient to the connection and the operation at scene.

Description of drawings

Fig. 1 the utility model structural representation.

The specific embodiment

Embodiment 1: as shown in Figure 1, the extraordinary wellhead assembly of the utility model thick oil thermal extraction comprises control joint 1, lock ring 2, pull bar 3, slips 4, thrust piston 5, hanger 6, communicating pipe 7, holddown spring 9, and composition such as sealing ring 10.The inner upper end design of control joint 1 has screw thread, can be connected with the end flange that recovers the oil, the interior lower end design has step to be pressed in the top of oil well casing, control joint 1 utilizes the screw thread of its outside lower end and table cover box cupling 12 to link, realization is to the control of oil well casing elongation, hanger 6 is sleeved on the below of oil well casing box cupling 8, by pressure ring 2, pull bar 3 is realized being fixedly connected with the box cupling 8 of oil well casing, on hanger 6 outside ribs slips 4 is installed, thrust piston 5 and communicating pipes 7 assembly, power fluid drives thrust piston 5 by the bottom that cross over pipe 7 enters the thrust fluid cylinder, promote slips 4 along the up tensioner of the conical surface by thrust piston 5, oil well casing is hung on the inwall that is fixed on table cover 11, and slips 4 is fixed on the conical surface of hanger 6 by holddown spring 9.

The right sectional drawing of Fig. 1 shows slips 4, thrust piston 5 and holddown spring 9, and the up schematic diagram of sealing ring 10.

Embodiment 2: adopt the mode of screw thread to connect between lower end and the top layer box cupling 12 of control joint 1, the connection screw thread can be taper pipe thread, also can be straight thread.

It can be 2 or 3 or 4 or 5 that the outside design of hanger 6 has rib, rib number, and the bottom design of rib has the thrust fluid cylinder, and thrust piston 5 is installed in the thrust fluid cylinder.

Slips 4 is installed on the rib conical surface in hanger 6 outsides,

Slips 4 is pressed abd fixed on by holddown spring 9 on the rib of hanger 6, and holddown spring can be an elastomeric material, also can be metal material.

Hanger 6 is enclosed within the below of the box cupling 8 of oil well casing, is fixedly connected with the box cupling 8 of oil well casing by pressure ring 2, pull bar 3.

Claims

1, the extraordinary wellhead assembly of a kind of thick oil thermal extraction, control joint (1) is arranged, pressure ring (2), pull bar (3), slips (4), thrust piston (5), hanger (6), communicating pipe (7), holddown spring (9), and sealing ring (10), it is characterized in that: the inner upper end design of control joint (1) has screw thread and is connected with the end flange that recovers the oil, the interior lower end design has step to be pressed in the top of oil well casing, control joint (1) utilizes the screw thread of its outside lower end and table cover box cupling (12) to link, hanger (6) is by pressure ring (2), pull bar (3) is fixedly connected with the box cupling (8) of oil well casing, the outside of hanger (6) is equipped with slips (4), thrust piston (5) and communicating pipe (7) assembly, slips (4) is fixed on the conical surface of hanger (6) by holddown spring (9).

2, according to the described thick oil thermal extraction wellhead assembly of claim 1, it is characterized in that: adopt the mode of screw thread to connect between lower end and the top layer box cupling (12) of control joint (1), the connection screw thread is taper pipe thread or straight thread.

3, thick oil thermal extraction wellhead assembly according to claim 1, it is characterized in that: there is rib the outside of hanger (6), the rib number is two or three or four or five, and the bottom design of rib has the thrust fluid cylinder, and thrust piston (5) is installed in the thrust fluid cylinder.

4, thick oil thermal extraction wellhead assembly according to claim 1 is characterized in that: slips (4) is installed on the rib conical surface in hanger (6) outside.

5, thick oil thermal extraction wellhead assembly according to claim 1 is characterized in that: slips (4) is pressed abd fixed on the rib of hanger (6) by holddown spring (9), and holddown spring is an elastomeric material, also or metal material.

6, thick oil thermal extraction wellhead assembly according to claim 1 is characterized in that: hanger (6) is enclosed within the below of the box cupling (8) of oil well casing, is fixedly connected with the box cupling (8) of oil well casing by pressure ring (2), pull bar (3).