CN203959096U - Gas storage observation well completion string - Google Patents

Abstract

The utility model provides a gas storage observation well completion tubular column, including the tubular column body, top-down has concatenated upper flow nipple joint, subsurface safety valve, lower flow nipple joint, circulation sliding sleeve, first retrievable packer, first pressure gauge support cylinder, blanking plug seat short circuit and test seat short circuit on the tubular column body in proper order. The pressure gauge is fixed by arranging the pressure gauge support cylinder, so that the monitoring of the formation pressure and the temperature is realized, and the gas storage observation well completion pipe column can also perform fluid sampling analysis during the gas injection and production period so as to monitor the change of the fluid property; additionally, the utility model discloses a gas storage storehouse observation well completion tubular column can realize the multiple operation and link, reduces the operation link, avoids the secondary pollution of reservoir, can realize the purpose of accurate monitoring formation parameter.

Description

Gas storage observation well completion string

technical field

The utility model relates to an oil (gas) production process pipe string, in particular to a gas storage observation well completion pipe string.

Background technique

A gas storage is an artificial gas field or gas reservoir formed by reinjecting commercial natural gas from long-distance pipelines into underground space. Large, edge and bottom water agitation will also affect the gas storage, so it is extremely important to establish a dynamic monitoring system. In order to observe the change of the formation pressure of the gas storage, the pressure change of the edge and bottom water area, and the sealing of the fault, it is necessary to deploy a certain number of observation wells for continuous pressure and temperature monitoring. Perform fluid sampling and analysis in time, monitor changes in fluid properties, analyze whether gas channeling occurs or whether the gas storage is operating normally, and provide basic data for later inventory and calculation of losses.

Utility model content

The purpose of the utility model is to provide a gas storage observation well completion pipe string for monitoring the pressure and temperature of the bottom layer of the gas storage, and to perform fluid sampling during gas injection and production.

In order to achieve the above purpose, the utility model provides a gas storage observation well completion pipe string, including a pipe string body, which is connected in series from top to bottom with an upper flow nipple, a downhole safety valve, a lower Flow sub, recirculation sleeve, first retractable packer, first pressure gauge holder, plug seat short and test seat short.

In the gas storage observation well completion string described above, a second removable packer is also connected between the first pressure gauge holder and the plugging short.

In the gas storage observation well completion string described above, a second pressure gauge holder is further connected between the plugr seat short and the test seat short.

The gas storage observation well completion tubing string as described above, wherein, the tubing body and the upper flow nipple, the downhole safety valve, the lower flow nipple, the circulating sliding sleeve, the first removable packer, Air-tight threaded connections are used between the first pressure gauge support cylinder, the second removable packer, the stopper short connection, the second pressure gauge support cylinder and the test short connection.

The gas storage observation well completion string as described above, wherein, the gas storage observation well completion string further includes a piezometric umbilical, and the piezometric umbilical is fixed to the first pressure gauge support The cylinder is connected to the pressure gauge of the second pressure gauge holder and extends to the ground.

The gas storage observation well completion string as described above, wherein the gas storage observation well completion string further includes a ground control system arranged on the ground, and the ground control system is connected to the piezometer cable connect.

The gas storage observation well completion pipe string described above, wherein the bottom end of the pipe string body is connected with a bell mouth.

The gas storage observation well completion string described above, wherein the string body is an oil pipe with a diameter of 88.9 mm.

The advantage of the gas storage observation well completion string of the utility model is that the pressure gauge is fixed by setting the pressure gauge holder, thereby realizing the monitoring of formation pressure and temperature, and the gas storage observation well completion of the utility model is adopted The pipe string can also be used for fluid sampling and analysis during gas injection and production to monitor changes in fluid properties; in addition, the completion pipe string of the gas storage observation well of the utility model can realize multi-process joint operation, reduce operation links, and avoid storage The secondary pollution of formation can be realized, and the purpose of accurately monitoring formation parameters can be achieved.

Description of drawings

The following drawings are only intended to illustrate and explain the utility model schematically, and do not limit the scope of the utility model. in:

Fig. 1 is a schematic diagram of the observation well completion string of the gas storage of the utility model.

Explanation of main component labels:

1 Pipe string body 2 Upper flow nipple 3 Downhole safety valve

4 Lower flow nipples 5 Circulating sliding sleeve 6 First removable packer

7 The first pressure gauge holder 8 The second removable packer 9 The plug is located and shorted

10 The second pressure gauge holder 11 The test seat is short-circuited 12 The bell mouth

13 Production string 15 Oil layer

Detailed ways

In order to have a clearer understanding of the technical features, purposes and effects of the utility model, the specific implementation of the utility model is now described with reference to the accompanying drawings.

As shown in Figure 1, the utility model provides a gas storage observation well completion pipe string, which is set in the production pipe string 13, including the pipe string body 1, and the upper pipe string body 1 is connected in series from top to bottom. Flow nipple 2, downhole safety valve 3, lower flow nipple 4, circulating sliding sleeve 5, first removable packer 6, first pressure gauge holder 7, stopper seat short 9 and test seat short 11 , that is, the upper flow nipple 2, the downhole safety valve 3, the lower flow nipple 4, the circulation sleeve 5, the first removable packer 6, the first pressure gauge holder 7, the plug seat short 9 and the test seat The shorts 11 are connected in series through the pipe string body 1 .

Among them, the pipe string body 1 adopts L8013Cr stainless steel pipe, which has strong corrosion resistance and can prolong the service life of the pipe string; 2 and the lower flow sub-joint 4 to reduce the impact of disturbance on the downhole safety valve 3, prevent erosion, prolong the service life of the downhole safety valve 3, and enhance the safety of the pipe string; the circulation sliding sleeve 5 can realize circulation flushing , hollowing out to induce blowout and circulation killing; adopting the removable packer is easy to unseal, the workload of unsealing is small, it is convenient for later operation, and will not affect the normal operation of the gas storage. The first removable packer 6 can realize Isolation of the upper oil layer 15 (or the working formation or the formation to be tested) and the annulus of the oil jacket; the first pressure gauge holder 7 is a pressure gauge protection device for fixing the pressure gauge, and the pressure gauge is used to monitor the temperature of the formation at any time and pressure; the plug is located at the short connection 9 for sealing and isolating tools, and the plug is lowered to the plug at the short connection 9 by using steel wire operation, so that the packer can be set and the string can be tested for pressure; test The short-connected 11 work cylinder is located at the bottom of the pipe column body 1, and can be temporarily lowered into the test instrument by using steel wire operation according to the test needs.

As shown in Figure 1, in a preferred technical solution, a second removable packer 8 is also connected between the first pressure gauge support cylinder 7 and the bung plug 9, that is, the first removable packer. The packer 6 and the second removable packer 8 can isolate the two main oil layers 15 respectively.

Further, a second pressure gauge support cylinder 10 is also connected between the plug-seat short-circuit 9 and the test-seat short-circuit 11 . By fixing pressure gauges on the first pressure gauge holder 7 and the second pressure gauge holder 10, the pressure and temperature tests of the two main oil layers 15 can be carried out respectively. But the utility model is not limited thereto, and a plurality of pressure gauge holders and a plurality of removable packers can also be arranged according to actual needs.

In addition, a bell mouth 12 is connected to the bottom of the pipe string body 1. The bell mouth 12 can reserve a large chamfer at the lower end of the completion pipe string. Because of its large opening at the lower part, it can be smoothly inserted into and out of the test instrument or tool.

In this embodiment, the pipe string body 1, the upper flow nipple 2, the downhole safety valve 3, the lower flow nipple 4, the circulating sliding sleeve 5, the first removable packer 6, the first pressure gauge holder 7, The second removable packer 8, the stopper short connection 9, the second pressure gauge holder 10 and the test short connection 11 are all connected with airtight threaded connections, such as VAM-TOP airtight threaded connections. The method still has perfect air-tight performance when bearing compound loads, so as to ensure the air-tightness between various components, and at the same time it has excellent bending resistance, compression resistance, torsion resistance, simple operation and convenient maintenance.

The gas storage observation well completion string also includes a piezometer cable, which is connected to the pressure gauges fixed on the first pressure gauge holder 7 and the second pressure gauge holder 10 and extends to the ground for To achieve the purpose of monitoring formation parameters by transmitting parameter values such as formation pressure and temperature, that is, prefabricate capillary tubes and optical fibers into a pipeline on the ground to make temperature and pressure measurement pipe cables, use capillary tubes to transmit pressure, and use optical fibers to transmit pressure. Transmit temperature to realize downhole pressure and temperature monitoring.

The gas storage observation well completion string also includes a ground control system arranged on the ground. The ground control system includes, for example, interconnected data acquisition devices, data analysis devices, and controllers (computers). connect.

In addition, the downhole safety valve 3 is connected to the surface control system through the steel hydraulic control pipeline, and the opening and closing of the downhole safety valve 3 is realized by controlling the liquid pressure in the hydraulic control pipeline, so as to achieve the purpose of downhole opening and closing.

In this embodiment, the tubing string body 1 is an oil pipe with a diameter of 88.9 mm. The tubing string body with this diameter is convenient for serially connecting pressure gauge holders and other components, which is convenient for installation, and can avoid erosion of the tubing under abnormal conditions. Reduce the risk of gas well unloading.

When in use, the gas storage observation well completion string of the utility model is lowered into the production string 13 and fixed, and the oil pipe make-up torque is within the set range, the oil pipe and the oil pipe, and the oil pipe and each downhole tool must be connected The airtightness is tested and qualified to ensure safety. The observation well completion pipe string of the gas storage of the utility model can not only monitor the formation pressure and temperature continuously, but also conduct regular fluid sampling and analysis combined with steel wire operation to judge whether gas channeling occurs or whether the gas storage is in operation Normal, to achieve the purpose of monitoring, the gas storage observation well completion pipe string of the utility model is composed of the pipe string body 1 and various downhole tools, which can realize multi-process joint operation, reduce operation links, and avoid secondary pollution of the reservoir , can achieve the purpose of accurately monitoring formation parameters. In addition, if the upper pipeline and the control system are connected on the ground, the observation well completion string of the gas storage of the utility model can also play the function of the injection-production string.

The above descriptions are only illustrative specific implementations of the present utility model, and are not intended to limit the scope of the present utility model. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principle of the present utility model shall fall within the protection scope of the present utility model. And it should be noted that each component of the utility model is not limited to the above-mentioned overall application, and each technical feature described in the specification of the utility model can be selected to be used alone or in combination according to actual needs. Therefore, The utility model naturally covers other combinations and specific applications related to the invention point of the case.

Claims (8)

1. a gas storage is observed well completion tubular column, comprise tubing string body, it is characterized in that, on described tubing string body, be serially connected with successively mobile pipe nipple, Down Hole Safety Valve (DHSV), current downflow pipe nipple, circulation slide sleeve, the first retrievable excluder, the first manometer from top to bottom, blanking plug is located short circuit and short circuit is located in test.

2. gas storage as claimed in claim 1 is observed well completion tubular column, it is characterized in that, described the first manometer and described blanking plug are located and between short circuit, are also connected with the second retrievable excluder.

3. gas storage as claimed in claim 1 or 2 is observed well completion tubular column, it is characterized in that, described blanking plug is located short circuit and described test and is located and between short circuit, is also connected with the second manometer.

4. gas storage as claimed in claim 3 is observed well completion tubular column, it is characterized in that, described tubing string body and described mobile pipe nipple, Down Hole Safety Valve (DHSV), current downflow pipe nipple, circulation slide sleeve, the first retrievable excluder, the first manometer, the second retrievable excluder, blanking plug are located short circuit, the second manometer and test and are located between short circuit and all adopt vapor seal to be threaded.

5. gas storage as claimed in claim 3 is observed well completion tubular column, it is characterized in that, described gas storage is observed well completion tubular column and is also comprised pressure measurement umbilical, described pressure measurement umbilical be fixed on described the first manometer and be connected and extend on ground with the pressure gauge of described the second manometer.

6. gas storage as claimed in claim 5 is observed well completion tubular column, it is characterized in that, described gas storage is observed well completion tubular column and also comprised the ground control system that is arranged on ground, and described ground control system is connected with described pressure measurement umbilical.

7. gas storage as claimed in claim 1 is observed well completion tubular column, it is characterized in that, described tubing string body bottom is connected with exit skirt.

8. gas storage as claimed in claim 1 is observed well completion tubular column, it is characterized in that, described tubing string body is that diameter is the oil pipe of 88.9mm.