CN204754881U - Double -barrelled gas well flow string parallels - Google Patents

Abstract

The utility model discloses a parallel double-pipe gas well production pipe string, which includes a casing pipe, a double-pipe oil pipe hanger, a large oil pipe, a small oil pipe and a double-pipe packer. The large oil pipe and the small oil pipe are hung by the double pipe oil pipe hanger Hanging in the casing, the double-pipe packer packs the casing and fixes the large tubing and the small tubing; the large tubing is equipped with the first downhole safety valve and the first working cylinder; the small tubing is equipped with the first Two downhole safety valves and a second working cylinder. When the initial production capacity of the tubing string is high, the large and small oil pipes are produced at the same time; when the medium-term production capacity drops, the large oil pipes are produced separately; Self-sprinkling uses gas lift drainage to collect gas. It realizes that the gas well does not need to operate the moving string during the whole production process. It has the characteristics of fast gas production speed and low environmental pollution. It does not require well workover in the later stage, reduces reservoir pollution, and reduces operating costs. It has good applicability to the development of high-yield gas fields.

Description

A parallel double-pipe gas well production string

technical field

The utility model relates to oil and gas exploitation equipment, in particular to a gas well production string.

Background technique

The State Intellectual Property Office published the publication number CN203452734U on February 26, 2014, and the patent name is a patent for a high-pressure gas well production and wax removal and prevention integrated pipe string. This patent discloses a high-pressure gas well production and wax removal and prevention. The integrated string structure includes setting a chemical agent injection valve on the oil pipe, which is a one-way valve; in addition, a capillary line is set in the annular space between the oil pipe and the casing, and one end of the capillary line is connected to the chemical agent injection valve The other end protrudes to the ground, which can meet the conditions of protective fluid and packer in the annulus of high-pressure gas wells, and achieve the purpose of wax removal and anti-wax; in addition, a downhole safety valve is installed on the oil pipe above the chemical agent injection valve, and the downhole safety valve is realized by the control pipeline. To open or close, one end of the control pipeline is connected to the downhole control valve, and the other end is connected to the surface equipment. On the one hand, the new string structure reduces the wax plugging of high-wax and high-pressure gas wells; on the other hand, it ensures the safe production of high-pressure gas wells.

The technical solution of the above-mentioned patent is obviously different from that of this patent, and the problems to be solved are also different. Because the above-mentioned patent adopts the traditional single string The production string is optimized according to the production requirements, and the string size is only suitable for the production requirements when the production capacity is high in the initial stage of production. In the middle and later stages of gas well production, with the formation pressure drop, production layer pollution, water discharge and other problems, the original production string will not be able to meet the demand for liquid-carrying production, resulting in liquid accumulation or even water flooding and shutdown of gas wells. At this time, it is necessary to implement the drainage and gas recovery process through workover operations to restore the normal production of the gas well. The workover operation of the gas well requires a large investment, high risk, and great difficulty. The expected goal cannot be achieved after the well, which not only causes economic losses, but also causes environmental pollution.

Utility model content

The purpose of the utility model is to overcome the deficiencies in the prior art and provide a parallel double-pipe gas well production string that can meet the entire life cycle of gas well production. It meets the needs of pressure drop in the middle and late stages and continuous liquid-carrying production after the gas well produces water, without moving string workover operations.

The technical scheme that the utility model solves the problems of the technologies described above is as follows:

A parallel double-pipe gas well production string, which includes a casing, a double-pipe tubing hanger, a large oil pipe, a small oil pipe, a first downhole safety valve, a second downhole safety valve, a double-pipe packer, a first working cylinder and The second working cylinder, the large oil pipe and the small oil pipe are suspended in the casing through the double-pipe oil pipe hanger, and the double-pipe packer packs the casing and fixes the large oil pipe and the small oil pipe; The first downhole safety valve is installed on the large tubing and above the double-pipe packer, and the first working cylinder is installed on the large tubing and below the double-pipe packer; the small tubing is located on the double-pipe packer The second downhole safety valve is installed above the device, and the second working cylinder is installed on the small tubing and below the double-tube packer; the first working cylinder and the second working cylinder are used for the seat of the double-tube packer. Sealing, as well as the plugging of large oil pipes and small oil pipes.

Further, the lower end of the large oil pipe is provided with a first wire guide shoe, and the lower end of the small oil pipe is provided with a second wire guide shoe.

Further, a gas lift valve is installed on the small oil pipe and above the double pipe packer.

Further, the large oil pipe is formed by butting a plurality of oil pipes, and the two ends of the first downhole safety valve and the two ends of the first working barrel are screwed to the oil pipe; the upper end of the first wire guide shoe is connected to the The lowest part of the oil pipe threaded connection.

Further, the first working cylinder is located at the first to second oil pipes below the double-pipe packer.

Further, the small oil pipe is formed by butting a plurality of oil pipes, and the two ends of the second downhole safety valve, the two ends of the second working cylinder and the two ends of the gas lift valve are all threadedly connected with the oil pipe; The upper end of the two steel wire guide shoes is threadedly connected with the oil pipe at the lowest part.

Further, the gas lift valve is connected to the small oil pipe and is located at the first to second oil pipe above the double-pipe packer.

Further, the second working cylinder is located at the first to second oil pipes below the double-pipe packer.

Beneficial effects of the utility model: the string structure can meet the production needs of the gas well in its entire life cycle. When the initial production capacity is high, the large and small oil pipes are produced simultaneously; when the mid-term production capacity declines, the large oil pipes are produced separately; Strong, it can carry liquid alone for production; if there is a lot of liquid and it cannot be self-sprayed, gas extraction will be carried out by gas lift drainage. The pipe string fully considers the water drainage and gas recovery process in the middle and later stages of gas well production, and realizes that the gas well does not need to operate the pipe string during the entire production process. It has the characteristics of fast gas production speed and low environmental pollution. pollution, reduce operating costs, and have good applicability to the development of high-yield gas fields.

Description of drawings

Fig. 1 is a schematic diagram of a parallel double-pipe gas well production string of the present invention.

In the figure: 1. Double tubing hanger; 2. Large tubing; 3. Small tubing; 4. First downhole safety valve; 5. Second downhole safety valve; 6. Gas lift valve; 7. Double tubing packer; 8. The first working cylinder; 9. The second working cylinder; 10. The first steel wire guide shoe; 11. The second steel wire guide shoe; 12. Sleeve.

Detailed ways

As shown in Figure 1, a parallel double-pipe gas well production string includes casing 12, double-pipe tubing hanger 1, large tubing 2, small tubing 3, first downhole safety valve 4, and second downhole safety valve 5 , a gas lift valve 6, a double-pipe packer 7, a first mandrel 8 and a second mandrel 9, the large oil pipe 2 and the small oil pipe 3 are suspended in the casing 12 through the double-pipe oil pipe hanger 1, and the The double-pipe packer 7 packs off the casing 12 and fixes the large tubing 2 and the small tubing 3 .

The first downhole safety valve 4 is installed on the large oil pipe 2 and above the double pipe packer 7, and the first working cylinder 8 is installed on the large oil pipe 2 and below the double pipe packer 7. The large oil pipe 2 The lower end of the first wire guide shoe 10 is equipped with. Specifically, the large oil pipe 2 is formed by butt jointing of multiple oil pipes, both ends of the first downhole safety valve 4 and both ends of the first working cylinder 8 are threadedly connected with the oil pipes, and the first working cylinder 8 is located on the double At the first to second oil pipes below the pipe packer; the upper end of the first wire guide shoe 10 is screwed to the lowest oil pipe.

The second downhole safety valve 5 is installed on the small tubing 3 and above the double-tube packer 7, and the second working cylinder 9 is installed on the small tubing 3 and below the double-tube packer 7, and the second working cylinder 9 It is used for setting the double-tube packer 7. The lower end of the small oil pipe 3 is provided with a second steel wire guide shoe 11 . A gas lift valve 6 is installed on the small oil pipe 3 and above the double pipe packer 7 . Specifically, the small oil pipe 3 is formed by butt jointing of multiple oil pipes, and the two ends of the second downhole safety valve 5, the two ends of the second working cylinder 9, and the two ends of the gas lift valve 6 are all threadedly connected to the oil pipes; The upper end of the second wire guide shoe 11 is threadedly connected to the oil pipe at the lowest part, and the gas lift valve 6 is connected to the small oil pipe 3 and located at the first to second oil pipes above the double pipe packer 7 . The second working cylinder 9 is located at the first to second oil pipes below the double pipe packer 7 .

The application of this patent requires the modification of the wellhead device of the gas well. The wellhead gas tree needs to be replaced with a qualified double-tube gas well gas tree, and the tubing hanger is replaced with a double-pipe gas-sealed tubing hanger. In order to meet the requirements of continuous liquid-carrying production in gas wells, the size of the tubing should be optimized. According to the gas well production allocation and production index prediction data, the inner diameter of the tubing that meets the continuous liquid-carrying production should be analyzed and optimized, and the gas lift valve parameters should be analyzed and designed. At the same time, according to the gas composition, Analyze and optimize the oil pipe material that meets the production requirements.

Working principle: In the early stage of gas well production, large and small double oil pipes are used for simultaneous production, no plugs are placed in the first working cylinder and the second working cylinder, and the large and small double oil pipes work at the same time; in the middle stage, pluggers are put in the second working cylinder to block the oil pipes, and use The large tubing is produced separately; in the later stage, a plug is put in the first working cylinder to block the tubing, and the small tubing is used for independent production; when the formation pressure drops, the gas well accumulates liquid, and the small tubing cannot meet the liquid-carrying production requirements, the annulus is injected with gas, so The injection gas enters the small tubing from the annular space through the gas lift valve 6, and the gas recovery operation is carried out by means of gas lift drainage.

In summary, after reading the document of the utility model, those of ordinary skill in the art can make other corresponding conversion schemes according to the technical scheme and technical concept of the utility model without creative mental work, all of which belong to the protection of the utility model. range.

Claims (8)

1. a two-tube gas well liquid loading tubing string arranged side by side, it is characterized in that: it includes sleeve pipe, two-tube tubing hanger, Big Inch, little oil pipe, the first storm valve, the second storm valve, dual tubing packing, the first seating nipple and the second seating nipple, described Big Inch and little oil pipe are hung in sleeve pipe by two-tube tubing hanger, described dual tubing packing carries out packing to sleeve pipe, and is fixed Big Inch and little oil pipe; On described Big Inch and the first storm valve is equipped with in the top being positioned at dual tubing packing, on Big Inch and the first seating nipple is equipped with in the below being positioned at dual tubing packing; On described little oil pipe and the second storm valve is equipped with in the top being positioned at dual tubing packing, on little oil pipe and the second seating nipple is equipped with in the below being positioned at dual tubing packing; Described first seating nipple and the second seating nipple are used for setting of dual tubing packing, and the shutoff to Big Inch and little oil pipe.

2. two-tube gas well liquid loading tubing string arranged side by side according to claim 1, it is characterized in that: the first steel wire guide shoe is equipped with in the lower end of described Big Inch, the lower end of described little oil pipe is provided with the second steel wire guide shoe.

3. two-tube gas well liquid loading tubing string arranged side by side according to claim 2, is characterized in that: on described little oil pipe and gas lift valve is equipped with in the top being positioned at dual tubing packing.

4. two-tube gas well liquid loading tubing string arranged side by side according to claim 2, is characterized in that: described Big Inch is docked by multiple-tubing string to form, and the two ends of described first storm valve are connected with tubing round thread with the two ends of the first seating nipple; The upper end of described first steel wire guide shoe is connected with the tubing round thread of lowest part.

5. two-tube gas well liquid loading tubing string arranged side by side according to claim 4, is characterized in that: the first seating nipple is positioned at 1st ~ 2 oil pipe places below dual tubing packing.

6. two-tube gas well liquid loading tubing string arranged side by side according to claim 3, it is characterized in that: described little oil pipe is docked by multiple-tubing string to form, and the two ends of described second storm valve, the two ends of the second seating nipple and the two ends of gas lift valve are all connected with tubing round thread; The upper end of described second steel wire guide shoe is connected with the tubing round thread of lowest part.

7. two-tube gas well liquid loading tubing string arranged side by side according to claim 6, is characterized in that: described gas lift valve to be connected on little oil pipe and to be positioned at the oil pipe place, 1st ~ 2, top of dual tubing packing.

8. two-tube gas well liquid loading tubing string arranged side by side according to claim 6, is characterized in that: described second seating nipple is positioned at 1st ~ 2 oil pipe places below dual tubing packing.