CN205743862U - Wellhead device for carbon dioxide flooding production well - Google Patents

Abstract

The utility model discloses a carbon dioxide drives oil recovery well wellhead assembly belongs to oil field mining site and equips technical field. This wellhead assembly includes: a tubing head four-way joint (1), a Christmas tree small four-way joint (13), a casing short joint (8) and a tubing hanger assembly (10); the upper end of the tubing head cross joint (1) is connected with the lower end of the Christmas tree small cross joint (13), and the lower end of the tubing head cross joint (1) is connected with the casing pipe nipple (8); the oil pipe hanger assembly (10) is arranged in the oil pipe head four-way joint (1), and the lower end of the oil pipe hanger assembly (10) is connected with a first double male short joint (18); the left side and the right side of the oil pipe head four-way joint (1) are respectively connected with a first gate (701); the left side and the right side of the small four-way joint (13) of the Christmas tree are respectively connected with a second gate (702). The wellhead device is low in height, the problem that the pumping unit foundation needs to be heightened when the carbon dioxide is replaced for driving the wellhead device of the oil production well is solved, normal operation of the pumping unit is guaranteed, and cost is reduced.

Description

Wellhead device for carbon dioxide flooding production well

technical field

The utility model relates to the technical field of oil field equipment, in particular to a wellhead device for a carbon dioxide flooding oil production well.

Background technique

Carbon dioxide flooding oil recovery technology refers to the oil recovery technology that injects carbon dioxide into the reservoir and uses carbon dioxide to drive the flow of crude oil. The use of carbon dioxide flooding oil recovery technology for crude oil recovery can significantly increase the recovery rate of crude oil and reduce costs. At present, many oil fields transform the traditional oil production wells by replacing the wellhead devices of the traditional oil production wells with the wellhead devices of the carbon dioxide flooding production wells, so as to use the carbon dioxide flooding recovery technology for crude oil recovery.

Existing wellhead devices for carbon dioxide flooding production wells mainly include tubing head spools, christmas tree small spools, and tubing hanger assemblies. Among them, the tubing hanger assembly is set inside the tubing head spool, which is used to connect the downhole tubing string; the lower end of the tubing head spool is connected to the casing nipple through a threaded flange, and the upper end of the tubing head spool is connected through a conversion flange Connect with the small cross of the Christmas tree. The sucker rod of the pumping unit is lowered into the production well through the small cross of the Christmas tree and the tubing hanger assembly.

In the process of realizing the utility model, the designer found that the prior art has at least the following problems: the height of the existing wellhead of the carbon dioxide flooding production well is relatively high, after replacing the traditional wellhead with the wellhead of the carbon dioxide flooding production well, it is necessary to add Normal mining can be carried out only when the foundation of the pumping unit is high. But heightening the foundation of the pumping unit will reduce the stability of the pumping unit, there is a potential safety hazard, and it will increase the cost.

Utility model content

In order to solve the above-mentioned technical problems, the utility model provides a wellhead device of a carbon dioxide flooding production well with a relatively low height.

Specifically, the following technical solutions are included:

A wellhead device for a carbon dioxide flooding production well, the wellhead device comprising: a tubing head spool, a christmas tree small spool, a casing nipple, and a tubing hanger assembly;

The upper end of the tubing head spool is connected to the lower end of the small tree spool, and the lower end of the tubing head spool is connected to the casing nipple;

The tubing hanger assembly is arranged inside the tubing head spool, and the lower end of the tubing hanger assembly is connected with a first double male nipple;

The left and right sides of the oil pipe head cross are respectively connected with first gates;

The left and right sides of the small spool of the Christmas tree are respectively connected with second gates.

Further, the left and right sides of the tubing head spool are connected to the first gate through the second double male nipple and the threaded flange.

Further, the left and right sides of the small spool of the Christmas tree are connected to the second gate through a third double male nipple and a threaded flange.

Further, one side of the oil pipe head spool is also provided with a first instrument flange; the first instrument flange is connected to the end of the first gate away from the oil pipe head spool.

Further, a right-angle stop valve is provided on the first instrument flange; a cloth pressure gauge is connected to the right-angle stop valve.

Further, a second instrument flange is provided on one side of the small spool of the oil tree; the second instrument flange is connected to the end of the second gate away from the small spool of the oil tree.

Further, a straight-through shut-off valve is provided on the second instrument flange; a pressure gauge is connected to the straight-through shut-off valve.

Further, the first gate and the second gate are both manual flat gates.

Further, the tubing hanger assembly is fixed to the tubing head cross through a top screw assembly.

Further, a steel ring is provided between the upper end of the tubing head spool and the lower end of the small tree spool.

The beneficial effect of the technical scheme that the utility model embodiment provides is:

In the wellhead device of the carbon dioxide flooding production well provided by the embodiment of the utility model, the upper end of the tubing head spool is directly connected to the lower end of the small tree cross, and the lower end of the tubing head spool is directly connected to the casing nipple, thereby effectively reducing the The height of the wellhead device of the carbon dioxide flooding production well solves the problem of raising the foundation of the pumping unit when replacing the wellhead device of the carbon dioxide flooding production well, ensures the normal operation of the pumping unit, and reduces the cost of the carbon dioxide flooding production process.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some implementations of the present invention. For example, those of ordinary skill in the art can also obtain other drawings based on these drawings on the premise of not paying creative efforts.

Fig. 1 is the structural representation of the wellhead device of the carbon dioxide flooding production well that the utility model embodiment provides;

Fig. 2 is a schematic diagram of the size of the wellhead device of the carbon dioxide flooding production well provided by the embodiment of the present invention.

The reference signs in the figure represent respectively:

1-Oil pipe head cross; 201-Second double male nipple; 202-Third double male nipple; 3-Stud bolts;

4-nut; 5-threaded flange; 6-steel ring; 701-first gate; 702-second gate; 8-casing pup joint;

9- jacking screw assembly; 10- tubing hanger assembly; 11- second plug; 1201- first instrument flange;

1202-second instrument flange; 13-Xmas tree small cross; 14-straight-through stop valve;

15-Pressure gauge; 16-Silk planting; 17-Joint; 18-First double male short joint; 19-Right angle stop valve;

20-the first plug; 21-the Christmas tree cap.

detailed description

In order to make the technical solutions and advantages of the present utility model clearer, the implementation of the present utility model will be further described in detail below in conjunction with the accompanying drawings. Unless otherwise defined, all technical terms used in the embodiments of the present invention have the same meanings as commonly understood by those skilled in the art.

The embodiment of the utility model provides a wellhead device of a carbon dioxide flooding production well, as shown in Fig. 1, the wellhead device includes: tubing head cross 1, oil tree small cross 13, casing nipple 8 and tubing hanger assembly 10 . The upper end of the tubing head spool 1 is connected to the lower end of the small spool 13 of the Christmas tree, and the lower end of the tubing head spool 1 is connected to the casing nipple 8 . The tubing hanger assembly 10 is arranged inside the tubing head spool 1 , and the lower end of the tubing hanger assembly 10 is connected with a first double male nipple 18 . The left and right sides of the tubing head spool 1 are respectively connected with first gates 701 , and the left and right sides of the small tree spool 13 are respectively connected with second gates 702 .

In the wellhead device of the carbon dioxide flooding production well provided by the embodiment of the utility model, the casing nipple 8 is used to connect with the casing head of the carbon dioxide flooding production well, and the first double male nipple 18 is used to connect with the downhole tubing string. When carrying out oil production operations, the casing nipple 8 is connected to the casing head of the oil production well, the first double male nipple 18 is connected to the downhole tubing string, and the sucker rod is passed through the oil tree small cross 13 and The first double male short joint 18 is lowered into the oil production well, and then the oil production operation can be carried out after connecting the polished rod and the packing box.

In the wellhead device of the carbon dioxide flooding production well provided by the embodiment of the utility model, the upper end of the tubing head spool 1 is directly connected to the lower end of the small tree spool 13, and the lower end of the tubing head spool 1 is directly connected to the casing nipple 8. Thereby effectively reducing the height of the wellhead device of the carbon dioxide flooding production well, solving the problem of needing to increase the foundation of the pumping unit when replacing the wellhead device of the carbon dioxide flooding production well, ensuring the normal operation of the pumping unit, and reducing the cost of the carbon dioxide flooding production process.

Further, referring to FIG. 1 , in the wellhead device provided by the embodiment of the present invention, the left and right sides of the tubing head spool 1 are connected to the first gate 701 through the second double male nipple 201 and the threaded flange 5 . Specifically, one end of the second double-male sub-joint 201 is connected to the horizontal interface of the tubing head spool 1, that is, the interfaces on the left and right sides of the tubing head spool 1, and the other end of the second double-male sub-joint 201 is fixed with a wire At the same time, the two ends of the first gate 701 are respectively fixed with a threaded flange, and the threaded flange of the second double male pup joint 201 and the first The threaded flange of the gate 701 is fixedly connected, so that the first valve 701 is connected with the oil pipe head spool 1 .

Further, referring to FIG. 1 , in the wellhead device provided by the embodiment of the present invention, the left and right sides of the small spool 13 of the Christmas tree are connected to the second gate 702 through the third double male nipple 202 and the threaded flange 5 . Specifically, one end of the third double male sub 202 is connected to the horizontal interface of the small spool 13 of the oil tree, that is, the interfaces on the left and right sides of the small spool 13 of the oil tree, and the other end of the third double male sub 202 is fixed a threaded flange; at the same time, a threaded flange is respectively fixed on both ends of the second gate 702, and the threaded flange of the third double male pup joint 202 and The threaded flange of the second gate 702 is fixedly connected, so as to connect the second valve 702 with the small cross 13 of the Christmas tree.

Those skilled in the art can understand that the second double-male short joint 201 , the third double-male short joint 202 , the first valve 701 and the second valve 702 are connected to the threaded flange through threads. In order to make the connection between the second double male pup joint 201, the third double male pup joint 202, the first valve 701 and the second valve 702 and the threaded flange more firm, you can connect the second double male pup joint 201, The joints of the third double male pup joint 202 , the first valve 701 , the second valve 702 and the threaded flange are welded.

Further, referring to Fig. 1, in the wellhead device provided by the embodiment of the present invention, in order to facilitate the monitoring of the oil field, the side of the oil pipe head spool 1 is also provided with a first instrument flange 1201, and the small spool 13 of the Christmas tree A second instrument flange 1202 is also provided on one side of the pipe, wherein the first instrument flange 1201 is connected to the end of the first gate 701 away from the tubing head spool 1, and the second instrument flange 1202 is connected to the end of the second gate 702 away from the Christmas tree. One end of the small four-way 13 is connected. A right-angle stop valve 19 is provided on the first instrument flange 1201 , and a straight-through stop valve 14 is provided on the second instrument flange 1202 . Both the right-angle stop valve 19 and the straight-through stop valve 14 are connected with a pressure gauge 15 .

Further, in the wellhead device provided by the embodiment of the present utility model, the first gate 701 and the second gate 702 can be manual flat gates, or gates of other forms commonly used in the field.

Further, referring to FIG. 1 , in the wellhead device provided by the embodiment of the present invention, the tubing hanger assembly 10 is fixed to the tubing head spool 1 through the jackscrew assembly 9 .

Further, referring to FIG. 1 , in the wellhead device provided by the embodiment of the present invention, a steel ring 6 is provided between the upper end of the tubing head spool 1 and the lower end of the small spool 13 of the Christmas tree. At the same time, a steel ring 6 is also arranged between two adjacent threaded flanges in the threaded flange 5 .

In addition, referring to Fig. 1, in the wellhead device provided by the embodiment of the present utility model, the upper end of the small spool 13 of the Christmas tree is also provided with a christmas tree cap 21, and the christmas tree cap 21 is connected to the small spool 13 of the christmas tree through the planting wire 16; A joint 17 is also provided on the side of the first instrument flange 1201 away from the oil pipe head spool 1, and a first plug 20 is provided on the joint 17, and a pressure gauge can be installed on the joint 17 after the first plug 20 is removed and other instruments; a second plug 11 is also provided on the side of the second instrument flange 1202 away from the small spool 13 of the Christmas tree.

Further, referring to Fig. 2, the height of the wellhead device provided by the embodiment of the utility model, that is, the distance H between the bottom end of the tubing head spool 1 and the top of the Christmas tree cap 21 can be 830-850 mm, preferably 840 mm; In the wellhead device provided by the example, the length L1 of the second double-male nipple 201 and the length L2 of the third double-male nipple 202 may be 170-180 mm, preferably 175 mm. By optimizing the main dimensions of the wellhead device provided by the embodiment of the present invention, the height of the wellhead device can be further reduced, and the cost of the carbon dioxide flooding oil recovery process can be reduced.

To sum up, the embodiment of the utility model optimizes and improves the structure and size of the wellhead device of the carbon dioxide flooding production well, effectively reduces the height of the wellhead device of the carbon dioxide flooding production well, and solves the need to increase the height of the wellhead device when replacing the carbon dioxide flooding production well. The problems of the foundation of the pumping unit can be solved to ensure the normal operation of the pumping unit and reduce the cost of the carbon dioxide flooding oil recovery process.

The above description is only for those skilled in the art to understand the technical solution of the utility model, and is not intended to limit the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (10)

1. a carbon dioxide drive oil production well wellhead assembly, it is characterised in that described wellhead assembly includes: oil Tube head four-way (1), the little four-way of production tree (13), casing nipple (8) and boll-weevil hanger assembly (10)；

The lower end of upper end four-way little with described production tree (13) of described tubing head four-way (1) is connected, described The lower end of tubing head four-way (1) is connected with described casing nipple (8)；

It is internal that described boll-weevil hanger assembly (10) is arranged on described tubing head four-way (1), and described oil pipe hangs The lower end of hanging device assembly (10) connects the first double male joint (18)；

The left and right sides of described tubing head four-way (1) is connected to the first gate (701)；

The left and right sides of the little four-way of described production tree (13) is connected to the second gate (702).

Wellhead assembly the most according to claim 1, it is characterised in that described tubing head four-way (1) The left and right sides by the second double male joint (201) and thread flange (5) and described first gate (701) Connect.

Wellhead assembly the most according to claim 1, it is characterised in that the little four-way of described production tree (13) The left and right sides by the 3rd double male joint (202) and thread flange (5) and described second gate (702) Connect.

Wellhead assembly the most according to claim 2, it is characterised in that described tubing head four-way (1) Side be additionally provided with first instrument flange (1201)；

Described first instrument flange (1201) and described first gate (701) are away from described tubing head four-way (1) One end connect.

Wellhead assembly the most according to claim 4, it is characterised in that described first instrument flange (1201) On be provided with angle shut-off valve (19)；The upper connection of described angle shut-off valve (19) has Pressure gauge (15).

Wellhead assembly the most according to claim 3, it is characterised in that the little four-way of described production tree (13) Side be additionally provided with second instrument flange (1202)；

Described second instrument flange (1202) and described second gate (702) are away from the little four-way of described production tree (13) one end connects.

Wellhead assembly the most according to claim 6, it is characterised in that described second instrument flange (1202) On be provided with straight-through stop valve (14)；The upper connection of described straight-through stop valve (14) has Pressure gauge (15).

Wellhead assembly the most according to claim 1, it is characterised in that described first gate (701) It is manual platform gate with the second gate (702).

Wellhead assembly the most according to claim 1, it is characterised in that described boll-weevil hanger assembly (10) Fixed with described tubing head four-way (1) by jackscrew assembly (9).

Wellhead assembly the most according to claim 1, it is characterised in that described tubing head four-way (1) Upper end and the lower end of the little four-way of described production tree (13) between be provided with steel ring (6).