阅读说明：本技术 一种可用于斜井的全金属密封双管注汽井口装置 (All-metal sealed double-pipe steam injection wellhead device for inclined shaft ) 是由 刘福东 国聪 马锐 刘文科 李雪野 姜超 雷广财 王东升 雷月鑫 于 2019-10-08 设计创作，主要内容包括：本发明公开了一种可用于斜井的全金属密封双管注汽井口装置,涉及石油开采技术领域,表层套管套设于生产套管外,表层套管顶部焊接有简易套管头组件,生产套管顶部焊接有油管头四通组件,油管头四通组件的四通内腔设有母悬挂器和母悬挂金属密封组件,母悬挂器内腔设有子悬挂器和子悬挂金属密封组件,油管一与母悬挂器连接于油管头四通组件的四通内腔,油管二与子悬挂器连接于母悬挂器内腔,油管头四通组件上方设有注汽树组件,母悬挂器的顶部槽内、子悬挂器的顶部槽内分别设有金属密封圈,金属密封圈连接注汽树组件的垂直通道底部,母悬挂器和子悬挂器均设有自动引正居中定位结构,实现了双管注汽功能,保证倾斜状态下的密封效果。(The invention discloses an all-metal sealed double-pipe steam injection wellhead device for an inclined well, which relates to the technical field of oil exploitation, wherein a surface casing is sleeved outside a production casing, a simple casing head assembly is welded at the top of the surface casing, a tubing head four-way assembly is welded at the top of the production casing, a parent hanger and a parent suspended metal sealing assembly are arranged in a four-way inner cavity of the tubing head four-way assembly, a child hanger and a child suspended metal sealing assembly are arranged in an inner cavity of the parent hanger, a tubing I and the parent hanger are connected with the four-way inner cavity of the tubing head four-way assembly, a tubing II and the child hanger are connected with the inner cavity of the parent hanger, a steam injection tree assembly is arranged above the tubing head four-way assembly, metal sealing rings are respectively arranged in a top groove of the parent hanger and a top groove of the child hanger, the metal sealing rings are connected with the bottom of a vertical channel of the steam injection tree assembly, the double-pipe steam injection function is realized, and the sealing effect in the inclined state is ensured.)

1. The utility model provides an all-metal seal double-barrelled steam injection well head device that can be used to inclined shaft which characterized in that: the production casing pipe (11) is sleeved with a surface casing pipe (12), a simple casing pipe head assembly (1) is welded at the top of the surface casing pipe (12), a tubing head four-way assembly (2) is welded at the top of the production casing pipe (11), a four-way inner cavity of the tubing head four-way assembly (2) is provided with a mother hanger (4) and a mother suspension metal sealing assembly (3), an inner cavity of the mother hanger (4) is provided with a son hanger (6) and a son suspension metal sealing assembly (5), a first oil pipe (9) and the mother hanger (4) are connected to a four-way inner cavity of the tubing head four-way assembly (2), a second oil pipe (10) and the son hanger (6) are connected to an inner cavity of the mother hanger (4), a steam injection tree assembly (7) is arranged above the tubing head four-way assembly (2), metal sealing rings (8) are respectively arranged in a top groove of the mother hanger (4) and a top groove of the son hanger (6), the metal sealing ring (8) is connected with the bottom of a vertical channel of the steam injection tree component (7), and the female hanger (4) and the sub hanger (6) are provided with automatic centering positioning structures.

2. An all-metal sealed dual-tube steam injection wellhead assembly for slant wells according to claim 1, wherein: the simple sleeve pipe head component (1) is internally provided with a sealing filler, and the top of the simple sleeve pipe head component is provided with a filler gland to seal the surface sleeve pipe (12).

3. An all-metal sealed dual-tube steam injection wellhead assembly for slant wells according to claim 1, wherein: the automatic centering and centering structure comprises: the inner cavities of the sub hanger (6) and the female hanger (4) are respectively provided with a first conical surface structure which is matched with each other, and the inner cavities of the female hanger (4) and the oil pipe head four-way component (2) are respectively provided with a second conical surface structure which is matched with each other.

4. An all-metal sealed dual-tube steam injection wellhead assembly for slant wells according to claim 1, wherein: the mother suspension metal sealing component (3) and the son suspension metal sealing component (5) are provided with reducing structures.

Technical Field

The invention relates to the technical field of oil exploitation, in particular to an all-metal sealed double-pipe steam injection wellhead device for an inclined shaft.

Background

In the drilling process of a horizontal well in a shallow oil reservoir layer, because the vertical depth is low, a slant well drilling machine is generally used for ensuring the deflecting requirement. After the process is finished, the well casing and the ground are in an inclined state.

In the Canadian oil sand exploitation process, a large amount of inclined drilling technology is applied, and a completion pipe column forms an included angle of 45 degrees with the ground. Because the sealing assembly is influenced by small axial force and radial force under the special working condition, the sealing assembly has larger difference with a conventional vertical well, the sealing effect is difficult to ensure by the sealing technology used by the conventional vertical well, and the inclined operation mode also easily causes the damage of a sealing element to cause the sealing failure.

Disclosure of Invention

In order to solve the technical problems, the invention provides an all-metal sealing double-pipe steam injection wellhead device for an inclined well, a surface casing is sleeved outside a production casing, a simple casing head assembly is welded on the top of the surface casing, a tubing head four-way assembly is welded on the top of the production casing, a mother hanger and a mother hanging metal sealing assembly are arranged in a four-way inner cavity of the tubing head four-way assembly, a son hanger and a son hanging metal sealing assembly are arranged in an inner cavity of the mother hanger, a first tubing and the mother hanger are connected with the four-way inner cavity of the tubing head four-way assembly, a second tubing and the son hanger are connected with the inner cavity of the mother hanger, a steam injection tree assembly is arranged above the tubing head four-way assembly, a top groove of, the top grooves of the sub-hangers are respectively provided with a metal sealing ring, the metal sealing rings are connected with the bottom of a vertical channel of the steam injection tree assembly, and the main hanger and the sub-hangers are respectively provided with an automatic centering positioning structure.

The technical effects are as follows: the invention designs an all-metal sealed double-pipe steam injection wellhead device which is suitable for inclined well completion working conditions.

The technical scheme of the invention is further defined as follows:

the full-metal sealed double-pipe steam injection wellhead device for the inclined shaft is characterized in that sealing filler is arranged inside the simple sleeve head assembly, and a gland sealing surface sleeve is arranged at the top of the simple sleeve head assembly.

The utility model provides a can be used to the sealed double-barrelled steam injection well head device of all metal of inclined shaft, automatic guide location structure placed in the middle includes: the inner cavities of the sub hanger and the mother hanger are respectively provided with a first conical surface structure which is matched with each other, and the inner cavities of the mother hanger and the tubing head four-way assembly are respectively provided with a second conical surface structure which is matched with each other.

The all-metal sealed double-pipe steam injection wellhead device for the inclined shaft comprises a main suspended metal sealing assembly and a sub suspended metal sealing assembly which are provided with reducing structures.

The invention has the beneficial effects that:

(1) according to the invention, the four-way inner cavity of the four-way assembly of the tubing head is arranged under the mother hanger and the mother suspension metal sealing assembly to complete annular sealing, and the sub hanger and the sub suspension metal sealing assembly are arranged in the inner cavity of the mother hanger to complete sealing of the sub hanger assembly;

(2) the metal sealing ring completes secondary sealing, so that the sealing structure is safe and reliable;

(3) the automatic centering and positioning structure is convenient for inclined installation working conditions, can ensure installation accuracy and offset the influence of the working conditions on radial stress of the primary suspension metal sealing assembly and the secondary suspension metal sealing assembly;

(4) according to the invention, the primary suspension metal sealing assembly and the secondary suspension metal sealing assembly are designed in a reducing structure, so that the collision failure in the process of descending to a target sealing position can be avoided;

(5) the combined design of the primary hanger and the secondary hanger realizes the double-pipe hanging function; all-metal sealing, and safe and reliable sealing.

Drawings

FIG. 1 is a schematic structural view of the present invention;

wherein: 1. a simple casing head assembly; 2. a tubing head four-way assembly; 3. a female suspension metal seal assembly; 4. a female hanger; 5. a sub-suspended metal seal assembly; 6. a sub-hanger; 7. a steam injection tree assembly; 8. a metal seal ring; 9. an oil pipe I; 10. an oil pipe II; 11. producing a sleeve; 12. and (4) a surface sleeve.

Detailed Description

The utility model provides a can be used to double-barrelled steam injection wellhead assembly of all metal seal of inclined shaft, the structure is as shown in figure 1, and outside production casing 11 was located to top casing 12 cover, the welding of 12 tops of top casing has simple and easy casing head subassembly 1, and simple and easy casing head subassembly 1 is inside to be equipped with the packing, and the top is equipped with gland seal surface casing 12. The top of the production casing 11 is welded with an oil pipe head four-way component 2, a four-way inner cavity of the oil pipe head four-way component 2 is provided with a mother hanger 4 and a mother suspension metal sealing component 3, an inner cavity of the mother hanger 4 is provided with a son hanger 6 and a son suspension metal sealing component 5, and the mother suspension metal sealing component 3 and the son suspension metal sealing component 5 are provided with reducing structures. The first oil pipe 9 and the female hanger 4 are connected to a four-way inner cavity of the tubing head four-way assembly 2, the second oil pipe 10 and the secondary hanger 6 are connected to an inner cavity of the female hanger 4, a steam injection tree assembly 7 is arranged above the tubing head four-way assembly 2, metal sealing rings 8 are respectively arranged in a top groove of the female hanger 4 and a top groove of the secondary hanger 6, the metal sealing rings 8 are connected with the bottom of a vertical channel of the steam injection tree assembly 7, the female hanger 4 and the secondary hanger 6 are respectively provided with an automatic centering positioning structure, the primary hanger 6 and the female hanger 4 are respectively provided with a first conical surface structure which is matched with each other, and the primary hanger 4 and the tubing head four-way assembly 2 are respectively provided with a second conical surface structure which is matched with each other, so that the automatic centering function can be realized during installation.

When the wellhead device is installed, the simple casing head assembly 1 is assembled firstly, the production casing 11 is sleeved with the casing head assembly, the casing head assembly is positioned at the top of the surface casing 12 in a welded and fixed mode, the packing gland of the production casing is screwed down, and sealing of the surface casing 12 is completed. And installing the four-way assembly 2 of the oil pipe head, and welding and fixing the four-way assembly with the top of the production casing 11. Putting down the first oil pipe 9, connecting with the female hanger 4 and putting down the first oil pipe into a four-way inner cavity of the four-way assembly 2 of the oil pipe head; and putting down the second oil pipe 10, connecting the second oil pipe with the secondary hanger 6, putting the second oil pipe into the inner cavity of the primary hanger 4, and pressing the jackscrew to complete the sealing of the annular space and the primary hanger 4. And mounting metal sealing rings 8 in grooves at the top of the female hanger 4 and grooves at the top of the sub hanger 6, then positioning the steam injection tree component 7 above the four-way component 2 of the tubing head, and fastening by using bolts, namely finishing the mounting of the whole device.

In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.