CN203321472U - A dual-pipe wellhead device for thermal recovery of heavy oil - Google Patents

Abstract

A double-pipe wellhead device for thermal recovery of thickened oil belongs to the technical field of mechanical oil recovery equipment. The steam injection valve comprises a main body four-way joint and a double-pipe shell, wherein a main pipe oil pipe hanger and an auxiliary pipe oil pipe hanger are arranged in a pipe, the double-pipe shell is connected with the main body four-way joint, the main pipe oil pipe hanger is connected with a production oil pipe, the auxiliary pipe oil pipe hanger is connected with an auxiliary oil pipe, the upper part of the auxiliary pipe oil pipe hanger is a step conical surface and is embedded into the inner wall of the double-pipe shell matched with the auxiliary pipe oil pipe hanger, a screw thread valve shell is connected onto the auxiliary pipe oil pipe hanger, the inner cavity of the auxiliary pipe oil pipe hanger is communicated with a steam injection valve through a through hole in the auxiliary pipe oil pipe hanger, the screw thread valve shell is directly connected with the. The utility model has the advantages of simple structure to can play the auxiliary pipe tubular column under the condition of the double-barrelled casing of immobility, realize oil field operations such as well-flushing, sand washing, test developments data in the pit, thereby reduce workover work load, alleviate workman's intensity of labour, practice thrift workover expense.

Description

A dual-pipe wellhead device for thermal recovery of heavy oil

technical field

The utility model relates to a double-pipe wellhead device for thermal recovery of heavy oil, which belongs to the technical field of mechanical oil recovery equipment. the

Background technique

In the wellhead device of the production well in the prior art, the large cross of the wellhead is connected by bolts before the oil pipe hanging flange, the main and auxiliary oil pipes are hung on the steps of the oil pipe hanging flange, and the double-pipe shell is connected with the oil pipe hanging thread Due to the limitation of this structure, when sand washing, well washing and other operations are carried out or the auxiliary pipe string is deepened, the bolts must be removed first, and all the parts of the tubing hanging flange and the double-pipe casing are removed. The auxiliary pipe string can only be lifted and removed, and then installed in sequence after the operation is completed. In addition, because the structure of the whole wellhead device is complex and there are many sealing parts, the entire operation is complicated and the disassembly workload is large. the

Contents of the invention

In order to overcome the deficiencies of the prior art, the utility model provides a double-pipe wellhead device for thermal recovery of heavy oil. the

A double-pipe wellhead device for thermal recovery of heavy oil, which is composed of a main four-way and a double-pipe casing. The pipe connecting the double-pipe casing and the main four-way has a main oil pipe hanger and an auxiliary pipe oil pipe hanger, and the main oil pipe hanger is connected to the production oil pipe. The auxiliary oil pipe is connected to the auxiliary oil pipe, and the upper part of the auxiliary oil pipe hanger is a stepped cone surface, which is embedded in the inner wall of the double-pipe shell that matches it; the threaded valve shell is connected to the auxiliary oil pipe hanger, and the inner cavity of the auxiliary oil pipe hanger Connect with the steam injection valve through the through hole on the auxiliary oil pipe;

The threaded valve housing is directly connected to the auxiliary pipe oil pipe; the single-head bolt connects the threaded valve housing and the double-pipe housing; the double-head bolt connects the main cross and the double-pipe housing. the

The utility model has the advantages of simple structure, and the auxiliary pipe string can be lifted and lowered without moving the double-pipe shell, so as to realize oil field operations such as well washing, sand washing, and testing of downhole dynamic data, thereby reducing the workover workload, Reduce the labor intensity of workers and save workover costs. the

Description of drawings

A more complete and better understanding of the invention, and many of its attendant advantages, will be readily appreciated by reference to the following detailed description when considered in conjunction with the accompanying drawings, but the accompanying drawings illustrated herein are intended to provide a further understanding of the invention , constituting a part of the utility model, the schematic embodiment of the utility model and its description are used to explain the utility model, and do not constitute an improper limitation of the utility model, as shown in the figure:

Fig. 1 is a structural schematic diagram of the first embodiment of the present utility model. the

Fig. 2 is a schematic structural diagram of the second embodiment of the present invention. the

Below in conjunction with accompanying drawing and embodiment the utility model is further described. the

Detailed ways

Obviously, many modifications and changes made by those skilled in the art based on the gist of the utility model belong to the protection scope of the utility model. the

Embodiment 1: As shown in Figure 1,

A double-pipe wellhead device for thermal recovery of heavy oil, which is composed of a main body cross 8 and a double pipe casing 11. The pipe connecting the double pipe casing 11 and the main body cross 8 has a main oil pipe hanger 10 and an auxiliary oil pipe hanger 5. The oil pipe hanger 10 is connected to the production oil pipe 9, the auxiliary pipe oil pipe hanger 5 is connected to the auxiliary oil pipe 7, and the upper part of the auxiliary pipe oil pipe hanger 5 is a stepped cone surface, which is embedded in the inner wall of the double-pipe housing 11 matching it; the threaded valve housing 1 is connected On the auxiliary pipe oil pipe hanger 5, the inner cavity of the auxiliary pipe oil pipe hanger 5 communicates with the steam injection valve 4 through the through hole 3 on the auxiliary pipe oil pipe hanger 5;

The threaded valve housing 1 is directly connected to the auxiliary pipe oil pipe hanger 5; the single-head bolt 2 is connected to the threaded valve housing 1 and the double-pipe housing 11; the

Embodiment 2: As shown in Figure 2, a double-pipe wellhead device for thermal recovery of heavy oil, the threaded valve housing 1 and the auxiliary pipe tubing hanger 5 are sequentially connected by a conversion joint 14, a small head 13 and a sliding sleeve 12, The through hole 3 on the auxiliary pipe string is on the sliding sleeve;

The sliding sleeve 12 is threadedly connected with the inner cavity of the auxiliary pipe oil pipe hanger 5, and the upper end of the double-pipe housing 11 has a size head 13; the size head 13 is connected to the adapter 14;

The structure of this movable double-tube wellhead can also be that in Embodiment 2, the small head 13 on the top of the double-tube housing 11 and the sliding sleeve 12 are designed as one. the

The structure of this movable double-pipe wellhead can also be that in embodiment 2, the secondary oil pipe hanger 5 and the sliding sleeve 12 are designed as one; other structures and shapes are the same as in embodiment 1. the

Embodiment 3: As shown in Figure 1, a dual-tube wellhead device for thermal recovery of heavy oil, the double-tube casing 11 is directly connected to the main body cross 8 with stud bolts 6, and certain sealing measures are taken at the same time. There are parallel main pipe strings and auxiliary pipe strings in the pipe connecting the main body 11 and the main body spool 8, and the main pipe string is composed of the main tubing hanger 10 and the production tubing 9. The auxiliary pipe string is composed of the auxiliary oil pipe hanger 5 and the auxiliary oil pipe 7. The upper part of the auxiliary oil pipe hanger 5 is a stepped conical surface, which is embedded on the inner wall of the double-pipe shell 11 matching it. The oblong hole of the cloth or the through hole 3 of other shapes that can meet the passage of a certain amount of gas and liquid. The bottom of the auxiliary oil pipe hanging 5 is connected with the auxiliary oil pipe 7. The threaded valve housing 1 is directly connected with the auxiliary pipe oil pipe hanger 5 with a single head bolt 2 . The inner cavity of the auxiliary pipe string communicates with the steam injection valve 4 through the through hole 3 on the auxiliary pipe string. The auxiliary pipe string can be used for oilfield operations such as steam injection, self-spraying, well washing, sand washing, testing, heating, and drug mixing. When carrying out operations such as well washing, sand washing, and testing, when the auxiliary pipe string must be lifted, first remove the single-head bolt 2 on the threaded valve casing 1, and then remove the threaded valve casing 1, and then lift it down. The tool can only put out the auxiliary pipe string through the threaded connection of the auxiliary pipe oil pipe hanging 5 inner cavity. When deepening the auxiliary pipe string, repeat the above steps to connect the lifting tool with the inner cavity of the auxiliary pipe oil pipe hanger 5, then lift the auxiliary pipe oil pipe hanger 5 and the lower pipe string together, and use the elevator to clamp the pipe string , unload the auxiliary pipe tubing hanger 5 and carry down the tool, then connect the pipe string that needs to be increased, and the deepening of the pipe string has just been completed. the

Embodiment 4: As shown in Figure 2, a double-pipe wellhead device for thermal recovery of heavy oil, the double-pipe casing 11 is directly connected to the main body cross 8 with stud bolts 6, and certain sealing measures are taken at the same time, the double-pipe casing The big and small heads 13 above 11 are threadedly connected with the double-pipe housing 11, and in the pipe where the double-pipe housing 11 is connected with the main cross 8, there are main pipe strings and auxiliary pipe strings arranged side by side. The main pipe string is hung by the main oil pipe 10 and The production tubing consists of 9 components. The auxiliary pipe string is composed of a sliding sleeve 12, an auxiliary oil pipe hanger 5 and an auxiliary oil pipe 7. The middle part of the auxiliary pipe oil pipe hanger 5 is a stepped conical surface, which is embedded on the inner wall of the double-pipe shell matching it. The structure of the sliding sleeve 12 , shape are basically the same as the structure and shape of the auxiliary pipe oil pipe hanger 5 top in embodiment 3, that is, there are evenly distributed oblong holes or other shaped through holes that can satisfy certain gas and liquid flow. The bottom of the auxiliary oil pipe hanging 5 is connected with the auxiliary oil pipe 7. The structure, function and operation mode of the main pipe string are the same as those in Embodiment 3. The function and operation mode of the secondary pipe string are also the same as those in Embodiment 3. When the auxiliary pipe string needs to be raised, remove the size head 13 and above parts (transfer joint 14, threaded valve housing 1), and then lower the lifting tool through the sliding sleeve 12 to the inner cavity of the auxiliary pipe oil pipe hanger 5 Connected with the thread, the secondary pipe string can be raised. When the secondary pipe string needs to be deepened, repeat the steps of the above-mentioned embodiment 3. the

The structure of this movable double-tube wellhead can also be that in embodiment 4, the small head 13 on the top of the double-tube housing 11 and the sliding sleeve 12 are designed as one. the

The structure of this movable double-pipe wellhead can also be that in embodiment 4, the secondary tubing tubing hanger 5 and the sliding sleeve 12 are designed as one. the

Embodiment 5: A double-pipe wellhead device, which is mainly composed of a main body cross 8 and a double-pipe casing 11. The double-pipe casing 11 has a main pipe string and an auxiliary pipe string. The auxiliary oil pipe hanger 5 is connected to the auxiliary oil pipe 7, and the outer surface of the auxiliary oil pipe hanger 5 is a stepped cone surface, which is embedded in the inner wall of the double-pipe housing 11 matching it, and the threaded valve housing 1 is connected to the auxiliary pipe column. The auxiliary pipe string communicates with the steam injection valve 4 through the through hole 3 on the auxiliary pipe string;

The through hole 3 on the auxiliary pipe string is on the auxiliary pipe oil pipe hanger 5, and the threaded valve housing 1 is directly connected with the auxiliary pipe oil pipe hanger 5. the

There can also be conversion joint 14, size head 13, sliding sleeve 12 between threaded valve housing 1 and auxiliary pipe oil pipe hanging 5, and the through hole 3 on the auxiliary pipe string is on the sliding sleeve. the

The through hole 3 is an oblong hole. the

The necks of the two wings of the double-tube shell 11 are changed from the welding process to the integral forging process, which not only reduces the processing difficulty and production cycle, but also increases the strength of the double-tube shell. the

As mentioned above, the embodiment of the present invention has been described in detail, but it is obvious to those skilled in the art that many modifications can be made as long as the inventive points and effects of the present invention are not substantially deviated from. Therefore, such modified examples are all included in the protection scope of the present invention. the

Claims (3)

1. A double-pipe wellhead device for thermal recovery of heavy oil is characterized in that it is composed of a main body four-way and a double-pipe casing, and the pipe connecting the double-pipe casing and the main body four-way has a main oil pipe hanger and an auxiliary pipe oil pipe hanger, and the main pipe oil pipe hanger The oil pipe hanger is connected to the production oil pipe, and the auxiliary pipe oil pipe is connected to the auxiliary oil pipe. The upper part of the auxiliary pipe oil pipe hanger is a stepped cone surface, which is embedded in the inner wall of the double-pipe shell that matches it; the threaded valve shell is connected to the auxiliary pipe oil pipe hanger. The inner cavity of the oil pipe hanger of the auxiliary pipe communicates with the steam injection valve through the through hole of the oil pipe hanger of the auxiliary pipe; The threaded valve housing is directly connected to the auxiliary pipe oil pipe; the single-head bolt connects the threaded valve housing and the double-pipe housing; the double-head bolt connects the main cross and the double-pipe housing. the 2. A double-pipe wellhead device for thermal recovery of heavy oil according to claim 1, characterized in that the sliding sleeve is threadedly connected with the auxiliary pipe oil pipe hanging cavity, and the upper end of the double-pipe shell has a small head; connector; Or the big and small heads above the double-tube housing are integrated with the sliding sleeve; Or the auxiliary pipe tubing hanger is integrated with the sliding sleeve. the 3. A dual-pipe wellhead device for thermal recovery of heavy oil according to claim 1 or 2, characterized in that the through hole is an oblong hole. the

Images