RU123824U1 - GAS WELL DESIGN - Google Patents

Abstract

The design of a gas well, including a conductor, production, main and central lift columns, suspended respectively in the column head, the transfer coil of the pipe head and the sub of the lower cross, the root and root valves, the upper cross, the upper and lower crosses are interconnected via pipelines, united in a single pipeline, flow meters are placed on the pipeline from the upper crosspiece and on the common pipeline, and cars are placed on the pipeline from the lower crosspiece mathematical control valve, near the wellhead there is an automatic control complex associated with flowmeters and an automatic control valve.

Description

The device relates to the oil and gas industry, in particular to the design of self-priming gas wells for operation at the final stage of development of gas fields, in particular to the operation of so-called self-priming gas wells, that is, wells in which the gas flow rate is insufficient to remove the liquid from the bottom.

Gas fields are developed by wells, the design of which contains a number of casing strings with an elevator string lowered into the inner production string. The mouth of gas wells is equipped with a column head and fountain fittings, consisting of a pipe head with lateral branches and a fountain tree with root and root valves and a cross with a working and reserve strings. The working strings of the spider of the fountain tree are connected to the lateral branches of the pipe head by pipelines, connected to a single pipeline.

At the final stage of development of gas fields, due to a decrease in the reservoir energy, a liquid plug is formed at the bottom of the well due to the arrival of produced water from the reservoir or loss of produced gas and deposition of condensation water on the bottom. Under the influence of an ever-increasing volume of this fluid, the wells stop, since the reservoir energy and, accordingly, the velocity of the upward gas flow are not enough to carry the fluid to the surface. When a certain column height of this fluid is reached at the bottom, gas from the formation cannot overcome the fluid barrier and the well self-pressures, that is, it shuts off [A. Kustyshev Complicated repairs of gas wells in the fields of Western Siberia .- M .: OOO Gazprom Expo, 2010. - 212 p.].

To prevent this phenomenon and ensure the removal of fluid to the surface, various methods and devices are used: technological development of a well on a torch, injection of surfactants into a well; reducing the diameter of the elevator column; the use of a plunger lift.

In recent years, technology has begun to be used for the simultaneous production of gas through the pipe and annular spaces of the well [A.S. 345266 USSR. E21B 43/00. 1972. Bull. No. 22]. The technology consists in limiting the extraction of gas from the annulus by throttling and ensuring the removal of fluid accumulated at the bottom to the surface through the elevator column.

The disadvantage of this design is the insufficient efficiency of liquid removal from the bottom, leading to its accumulation at the bottom and "self-squeezing", uncontrolled killing of the well, as well as low reliability of the well due to abrasive and corrosive wear of the production string during gas extraction through the annulus, which is prohibited safety rules in the oil and gas industry.

The task of creating a utility model is to increase the reliability of the design of a self-filling gas well.

The achieved technical result, which is obtained as a result of creating a utility model, is to eliminate the causes of self-jamming of a gas well due to automatic removal of fluid from the bottom and to eliminate abrasive and corrosive wear of the production string due to the prevention of gas production through the annulus.

The technical result is achieved by the fact that the design of a self-priming gas well includes a conductor, production, main and central lift columns suspended respectively in the column head, the transfer coil of the pipe head and the sub of the lower cross, the root and root valves, the upper cross, the upper and lower crosses interconnected by pipelines, combined into a single pipeline, on the pipeline from the upper cross and placed on a common pipeline skhodomery, and the pipeline is placed on the lower crosspiece automatic control valve at the wellhead is placed automatic control complex associated with flow and automatic control valve.

In FIG. depicted the claimed design of a self-priming gas well.

The design of a self-priming gas well includes a conductor 1, a production casing 2 concentrically mounted in it, suspended in a casing head 3. Inside the production casing 2 there is a main lift casing (OLK) 4 suspended in a transfer coil 5 of the pipe head 6, which is mounted on the upper flange of the casing heads 3. On the upper flange of the transfer coil 5 there is a lower crosspiece 7. Inside the OLK 4 there is a central lift column (CLK) 8 mounted from pipes of smaller diameter and suspended in a evodnik 9, which is installed on the lower crosspiece 7. Between the main 4 and the central 8 lift columns, an annular space (CP) 10 is formed. 10. On the upper flange of the sub 9 there are installed a root 11 and an over-root 12 valve and an upper cross 13.

The upper crosspiece 13 is connected to the lower crosspiece 7 by pipelines 14 and 15, forming a single pipeline 16 after the connection. Flow meters (P) 17 and 18, for example, of the “Venturi pipe” type, are placed on the pipeline 14 and the single pipeline 16, the signals from which are sent to the automatic control complex (AUK) 19, located near the wellhead. On the pipeline 15 from the lower crosspiece 7 is placed an automatic control valve (PK) 20, controlled by a signal transmitted from the automatic control complex 19.

The well of the claimed design works as follows.

After descent into the inner cavity of the main lift column (OLK) 4 of the central lift column (CLK) 8, suspend it in the sub 9 and complete the installation on the upper flange of the sub 9 of the root 11 and 12 root valves and the upper cross 13 with the pipe 14 and the installation of a single pipeline 6, connecting the pipeline 14 to the pipeline 15 from the lower crosspiece 7, the inflow from the reservoir is called and the well is flared.

The well is put into operation with the simultaneous extraction of gas through the central lift column 8 located in the inner cavity of the main lift column 4 and along the annular space (KP) 10 formed by the main 4 and central 8 lift columns.

During operation, a liquid plug is formed at the bottom of 21 wells due to the arrival of produced water at the bottom of 21 or loss of gas from the gas and deposition of condensation water at the bottom of 21. At certain speeds, for example, above 5 m / s, the liquid from the bottom 21 along with the gas stream is discharged to the wellhead, at a lower speed, the liquid ceases to be discharged and remains at the bottom 21 in the form of a liquid plug. Flow meters 17 and 18 installed on the pipe 14 from the upper crosspiece 13 and the single pipe 16 give signals about the values of the working flow rates to the automatic control complex (AUC) 19. The automatic control complex (AUC) 19 automatically processes the received information and to the automatic control valve ( RK) 20, a signal is received about a change in the flow area of the valve, and therefore about a change in flow rates in the annular space (KP) 10 and in the central lift column (TsLK) 8.

The proposed design allows the operation of a self-squeezing gas well without major repairs, which reduces the cost of operating the well by an order of magnitude.

Example No. 1 of the implementation of the design of a self-priming gas well. The design of a self-filling gas well includes a conductor mounted from casing pipes with a diameter of 324 mm, a production casing mounted from casing pipes with a diameter of 219 mm, suspended in a casing head OKK1-210-324 × 219. Inside the production casing, the main lift casing of lift pipes with a diameter of 168 mm is placed, suspended in the transfer coil of the tube head of the fountain fittings AF6-150 / 100 × 210, which is mounted on the upper flange of the column head. Inside the main lift column there is a central lift column of tubing with a diameter of 89 mm suspended in a sub that is mounted on the lower crosspiece. An annular space is formed between the main lift column with a diameter of 168 mm and the central lift column. An upper crosspiece is installed on the upper flange of the sub with a pipe with a flow-through section of 80 mm, which is connected to the pipeline from the lower crosspiece, forming a single pipeline after connection. On the pipeline from the upper crosspiece and a single pipeline, flow meters of the "Venturi pipe" type are placed, the signals from which are fed to an automatic control complex located near the wellhead. An automatic control valve RK-100 × 21, controlled by a signal transmitted from an automatic control complex, is located on the pipeline from the lower crosspiece.

Example No. 2 of the implementation of the design of a self-priming gas well. The design of a self-filling gas well includes a conductor mounted from casing pipes with a diameter of 245 mm, a production casing mounted from casing pipes with a diameter of 168 mm, suspended in a casing head OKK1-210-245 × 168. Inside the production casing, the main lift casing of elevator pipes with a diameter of 114 mm is located, suspended in the transfer coil of the tube head of the fountain fittings AF6-100 / 100 × 210, which is mounted on the upper flange of the column head. Inside the main lift column there is a central lift column of tubing 73 mm in diameter, suspended in a sub that is mounted on the lower crosspiece. An annular space is formed between the main lift column with a diameter of 114 mm and the central lift column. An upper crosspiece is installed on the upper flange of the sub with a 65 mm cross-section pipe. The upper crosspiece is connected to the lower crosspiece, forming a single pipeline after connection. On the pipeline from the upper cross and a single pipeline there are placed venturi-type flow meters, the signals from which are fed to an automatic control complex located near the wellhead. An automatic control valve RK-80 × 21, controlled by a signal transmitted from an automatic control complex, is located on the pipeline from the lower crosspiece.

Example No. 3 of the implementation of the design of a self-priming gas well. The design of a self-filling gas well includes a conductor mounted from casing pipes with a diameter of 245 mm, a production casing mounted from casing pipes with a diameter of 168 mm, suspended in a casing head OKK1-210-245 × 168. Inside the production casing, the main lift casing of elevator pipes with a diameter of 114 mm is located, suspended in the transfer coil of the tube head of the fountain fittings AF6-100 / 100 × 210, which is mounted on the upper flange of the column head. Inside the main lift column there is a central lift column of tubing 60 mm in diameter, suspended in a sub that is mounted on the lower crosspiece. An annular space is formed between the main lift column with a diameter of 114 mm and the central lift column with a diameter of 60 mm. An upper crosspiece is installed on the upper flange of the sub with a pipe with a bore of 60 mm. The upper crosspiece is connected to the lower crosspiece, forming a single pipeline after connection. On the pipeline from the upper cross and a single pipeline there are placed venturi-type flow meters, the signals from which are fed to an automatic control complex located near the wellhead. An automatic control valve RK-80 × 21, controlled by a signal transmitted from an automatic control complex, is located on the pipeline from the lower crosspiece.

Claims (1)

The design of a gas well, including a conductor, production, main and central lift columns, suspended respectively in the column head, the transfer coil of the pipe head and the sub of the lower cross, the root and root valves, the upper cross, the upper and lower crosses are interconnected via pipelines, united in a single pipeline, flow meters are placed on the pipeline from the upper crosspiece and on the common pipeline, and cars are placed on the pipeline from the lower crosspiece mathematical control valve, near the wellhead there is an automatic control complex associated with flowmeters and an automatic control valve.

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