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A straight-through thermal recovery casing head and its application method

A casing head, straight-through technology, applied in the field of casing head, can solve the problems of reduced sealing effect, size change of sealing position, and easy generation of gaps, etc., to improve construction safety, extend axial length, and improve sealing effect Effect

Active Publication Date: 2022-03-04
DONGYING XIN HUALIAN PETROLEUM MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, graphite sealing rings are generally used as sealing materials for casing heads in thermal recovery. Graphite sealing rings can withstand high temperatures, but are not elastic. Thermal expansion and contraction, due to the differences in the size and material of each metal part, the degree of thermal expansion and cold contraction of each metal part is different, and gaps are likely to occur between each other, resulting in changes in the size of the sealing position, which eventually leads to a reduction in the sealing effect or even failure
In addition, when high-temperature steam is injected, the thermal expansion of the casing in the oil layer will elongate in the axial direction, pushing and squeezing the Christmas tree on the upper end of the casing in the oil layer, causing potential safety hazards

Method used

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  • A straight-through thermal recovery casing head and its application method
  • A straight-through thermal recovery casing head and its application method
  • A straight-through thermal recovery casing head and its application method

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specific Embodiment approach

[0040] It should be noted that the structures, proportions, sizes, etc. shown in the drawings attached to this specification are only used to match the content disclosed in the specification, for those who are familiar with this technology to understand and read, and are not used to limit the implementation of the present invention Any modification of structure, change of proportional relationship or adjustment of size shall fall within the range covered by the technical content disclosed in the present invention without affecting the effect and purpose of the present invention. within range.

[0041] At the same time, terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit this specification. The practicable scope of the invention and the change or adjustment of its relative relationship shall also be regarded as the practicable scope of the present invention without...

Embodiment 1

[0043] combined with Figures 1 to 5 , this embodiment provides a straight-through thermal recovery casing head, including a casing head body 1, a slip hanger 2 is set inside the casing head body 1, and a compensating flange 4 is connected with a screw nut assembly 9 on the top The compensation flange 4 is provided with a compensation height for expansion and extension of the casing 01 of the oil supply layer, and an annular connection plate 3 coaxial with the casing head body 1 and the compensation flange 4 is clamped, A first graphite sealing ring 5 is embedded between the connecting plate 3 and the casing head body 1, a second graphite sealing ring 6 is embedded between the inner wall of the compensation flange 4, and the slip hanger 2. A third graphite sealing ring 7 is embedded at the setting seal of the casing head body 1.

[0044] In the above technical solution, the top of the compensation flange 4 is connected to the Christmas tree (not shown in the figure), and the ...

Embodiment 2

[0050] combined with Figures 6 to 8 , the present embodiment provides a connecting plate 3 applicable to embodiment 1, the specific technical solution is as follows, the connecting plate 3 includes an upper lifting mechanism 31, a driving mechanism 32 and a lower lifting mechanism 33, and the driving mechanism 32 can be The temperature change pushes the upper elevating mechanism 31 and the lower elevating mechanism 33 to move relative to each other in the axial direction, and when the upper elevating mechanism 31 moves axially, the second graphite sealing ring 6 is pushed into the second graphite sealing ring 6 of the compensating flange 4 tightly. In the sealing ring groove 41.

[0051] In the above technical solution, the connection plate 3 can expand and contract axially with the change of temperature, so as to compensate the axial gap between the metal elements due to thermal expansion and contraction, and at the same time, it can also keep the second graphite sealing rin...

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Abstract

The invention relates to the technical field of casing heads, in particular to a straight-through thermal recovery casing head and a method for using the same. The straight-through thermal recovery casing head includes the casing head body, the inside of the casing head body is set to seal the slip hanger, and the compensation flange is connected to the compensation flange through the screw nut assembly, and the compensation flange is provided with the oil supply layer casing expansion elongated compensation height, an annular connection plate coaxial with the casing head body and the compensation flange is clamped, and a first graphite seal is embedded between the connection plate and the casing head body A second graphite sealing ring is embedded between the inner wall of the compensating flange and a third graphite sealing ring is embedded between the slip hanger and the casing head body. The straight-through thermal recovery casing head provided by the invention has good structural stability, good sealing effect and high construction safety.

Description

technical field [0001] The invention relates to the technical field of casing heads, in particular to a straight-through thermal recovery casing head and a method for using the same. Background technique [0002] The casing head for thermal recovery is mainly used in oil wells for "thermal recovery of heavy oil", that is, injecting high-temperature steam (generally 400°C) into the well to heat the heavy oil at the bottom of the well and reduce its viscosity for easy extraction. The casing head of thermal recovery generally works intermittently. During mining, high-temperature steam at about 400°C is continuously injected into the well for about half a month, and then mining is performed. At present, graphite sealing rings are generally used as sealing materials for casing heads in thermal recovery. Graphite sealing rings can withstand high temperatures, but are not elastic. Thermal expansion and contraction, due to the differences in the size and material of each metal part...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/04
CPCE21B33/0422
Inventor 李沐岩孙荣华李妍慧张天保李振华
Owner DONGYING XIN HUALIAN PETROLEUM MACHINERY
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