JP4658111B2 - Piping system manufacturing apparatus, manufacturing method and repair method - Google Patents

Description

The present invention includes a manufacturing apparatus of the piping system relates to a manufacturing method and a repairing method.

  Conventionally, it has been practiced to dig deep wells on the ground to collect groundwater, and to separate and use the water-soluble natural gas dissolved in the groundwater. As a method for collecting groundwater, there is a so-called gas lift method in which compressed gas is injected in a well, the groundwater is raised by the buoyancy of the gas, and pushed out of the well. Usually, a piping system connecting from a well to a gas production plant is configured, and compressed gas for gas lift is supplied to the well through the piping system. Due to the relationship between the location where a well for collecting groundwater is to be dug and the location suitable for installing a gas production plant, the piping system may be extremely long, reaching up to several kilometers.

By the way, Patent Documents 1 to 4 disclose a method of forming a lining resin layer for preventing gas leakage on the inner surface of a pipe disposed mainly in or around a building in order to supply city gas. Has been. These pipes are short in length and are arranged in a relatively good environment in or around the building. Moreover, city gas is dehumidified gas and does not contain moisture (humidity). Under these conditions, there is little risk of corrosion from the inner surface of the pipe. However, even in the configurations of Patent Documents 1 to 4, there is a possibility of corrosion or damage from the outer surface of the pipe due to rain water or the like around the building. In that case, in order to prevent gas from leaking from the inside of the pipe, A lining resin layer for preventing gas leakage is formed on the inner surface.
Japanese Patent No. 3081349 Japanese Patent No. 3107485 Japanese Patent No. 3170271 Japanese Patent No. 2900909

  As described above, when the compressed gas supplied through the pipe for performing the gas lift method when collecting the groundwater in which the water-soluble natural gas is dissolved is a water-soluble natural gas, the gas has a high pressure (for example, 1 MPa or higher) and a high temperature (for example, 30 ° C. to 60 ° C.), contain water (may be in a steam saturated state), and contain a small amount of impurities. For this reason, the pipes constituting this piping system may be corroded from the inner surface by the compressed gas. This pipe is usually a very long metal tube and can be corroded from the inner surface by moisture and impurities.

  The problem of internal corrosion of pipes did not occur with short pipes for supplying city gas such as in Patent Documents 1 to 4, but the gas lift method for collecting groundwater in which water-soluble natural gas was dissolved was used. This occurs in a long pipe through which compressed gas flows for implementation. The lining resin layers disclosed in Patent Documents 1 to 4 are thin layers for preventing gas leakage, and of course, this cannot sufficiently prevent internal corrosion.

Therefore, an object of the present invention is to connect a well for collecting groundwater containing water-soluble natural gas and a gas production plant, and is a pipe that circulates compressed gas containing moisture embedded in the ground. and apparatus for manufacturing a pipe system that can prevent the inner surface corrosion of the pipe consists is to provide a manufacturing method and a repairing method.

A feature of the present invention is a piping system that connects between a well for collecting groundwater containing water-soluble natural gas and a gas production plant, and a lining resin layer for preventing internal corrosion is formed on the inner surface, In an apparatus for manufacturing a piping system configured by connecting a plurality of pipes that circulate compressed gas containing moisture embedded in the ground , a lining resin layer is formed before connecting the plurality of pipes. Temporary temporary connection of pipes other than pipes to be performed is performed, and the temporary connection is arranged in work shafts provided at the positions of both ends of each pipe, and is connected to the ends of each pipe. This is done by connecting the vertical pipes. According to the piping system manufactured by this device, the internal corrosion caused by the flow of compressed gas containing moisture in the pipe connecting the well for collecting groundwater containing water-soluble natural gas and the gas production plant, Problems that have not been recognized in the past can be solved.

When manufacturing such a piping system, the lining resin is injected into the pipe before the step of forming a lining resin layer for preventing internal corrosion on the inner surface of the pipe and the step of forming the lining resin layer. performing the process. In the step of injecting the lining resin into the pipe, a container for containing the lining resin, which includes a drop lid that can move up and down and a rubber plate located below or below the drop lid, is provided at one end of the pipe. In the state where the compressed air source is connected to the container and the compressed air source is connected to the container, the dropped lid is pressed by supplying the compressed air from the compressed air source to the container, and the lining resin located below the dropped lid and the rubber plate is placed in the container. The pressure inside the pipe is pushed out from the inside, and the pressure in the container is measured by the pressure gauge, and the flow rate of the compressed air supplied from the compressed air source to the container is measured by the flowmeter, When the pressure of the compressed air supplied to the container from the compressed air source coincides and the flow rate of the compressed air measured by the flow meter becomes zero, the lining resin in the container It is preferable to detect the completion of the injection into the pipe.

  According to this method, by using the drop lid, it is possible to apply pressure uniformly and evenly to the lining resin in the container and efficiently inject it into the pipe. Furthermore, by monitoring the pressure in the container and the supply amount of compressed air, it is possible to immediately and reliably detect the completion of the lining resin injection. Therefore, when the injection of the lining resin is completed, it is possible to immediately move to the next step (for example, the step of forming the lining resin layer), improve work efficiency, and move to the next step before the lining resin starts to cure. Therefore, the workability of layer formation is good.

  Further, in the manufacturing method of a piping system configured by connecting a plurality of pipes, before the step of connecting the plurality of pipes and before the step of forming the lining resin layer, within the range from the gas production plant to the well. A compressed air source is provided at an arbitrary position of the pipe, and among the plurality of pipes, all the pipes from the pipe adjacent to one pipe for forming the lining resin layer to the pipe closest to the compressed air source, Temporarily connect temporarily by connecting work standpipes arranged in work shafts provided at both ends of each pipe and connected to the ends of each pipe, and compressed air By connecting the pipe closest to the source to the compressed air source, an adjacent pipe is connected from the compressed air source via a temporarily connected pipe other than the pipe that forms the lining resin layer. Constitute a temporary pipe extending into the pipe to perform formation of the plastic lining layer, it is preferable to indirectly connected to adjacent pipes.

  According to this method, the compressed air source can be fixed at a place suitable for transportation and installation, and the transportation of the compressed air source, which has conventionally been a heavy burden, can be eliminated. Thereby, the production of the piping system becomes very easy. In addition, since the pipe before the completion of the piping system is used for supplying compressed air without providing a dedicated pipe for supplying compressed air from a fixed compressed air source, the work cost and time are increased. Can be suppressed.

  The pipe for forming the lining resin layer is connected to the adjacent pipe via the container for storing the lining resin and the compressed air supply mechanism, and the lining resin layer is formed from the compressed air source provided at an arbitrary position. The compressed air is supplied to the container via a temporarily connected pipe other than the pipe that performs the operation and the compressed air supply mechanism, and the lining resin is pressurized by the compressed air supplied to the container and pushed out from the container into the pipe. May be.

  Moreover, the repair method of the piping system of this invention includes the process of forming the lining resin layer for inner surface corrosion prevention in the arbitrary locations of the inner surface of a pipe. Furthermore, before the step of forming the lining resin layer, a step of partially cutting the pipe to separate the region including the portion to be repaired, and a step of injecting the lining resin into the region including the portion to be repaired Including.

  Then, in the step of injecting the lining resin into the region including the portion to be repaired of the pipe, similarly to the above-described manufacturing method of the piping system of the present invention, the drop lid that can move up and down and the lower surface or the lower side of the drop lid A container for housing the lining resin, which is embedded in the rubber plate located in the area, is connected to one end of the region including the portion to be repaired, and the compressed air source is connected to the container. Pressing the drop lid by supplying compressed air from the container, pushes the lining resin located below the drop lid and the rubber plate from the inside of the container to the area including the part to be repaired, The flow rate of the compressed air supplied from the compressed air source to the container is measured by the flow meter, and the pressure measured by the pressure gauge is measured from the compressed air source. When the pressure of the compressed air supplied to the container coincides with the pressure of the compressed air measured by the flow meter becomes zero, the inside of the lining resin in the container including the portion to be repaired It is preferable to detect completion of injection.

  In addition, before the step of injecting the lining resin into the region including the portion to be repaired, a compressed air source is provided at an arbitrary position within the range from the gas production plant to the well, and at a position close to the compressed air source. For cutting the pipe and connecting the cut point to a compressed air source to supply the compressed air from the cut point connected to the compressed air source to the cut point adjacent to the region including the portion to be repaired. It is good also as temporary piping. In that case, one end of the region including the portion to be repaired of the pipe is connected to a cutting point adjacent to the region including the portion to be repaired through the container for storing the lining resin and the compressed air supply mechanism, and repair is performed. In the step of injecting the lining resin into the region including the portion to be supplied, compressed air is supplied to the container from a compressed air source provided at an arbitrary position via a temporary pipe and a compressed air supply mechanism. It is preferable to pressurize the lining resin with compressed air supplied to the container and push it out of the container into the pipe.

  In these repair methods, the entire pipe is divided into regions of a predetermined length or less, and a step of injecting a lining resin and a step of forming a lining resin layer as a region including a portion to be repaired in all the divided regions May be performed sequentially.

  In the piping system, the manufacturing apparatus, the manufacturing method, and the repairing method described above, the thickness of the lining resin layer is preferably 1 mm or more on average in order to enhance the effect of preventing internal corrosion.

  ADVANTAGE OF THE INVENTION According to this invention, the internal corrosion of the pipe which was not regarded as a problem conventionally can be prevented, and durability of the piping system containing this pipe can be improved.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 schematically shows an entire facility including a piping system according to an embodiment of the present invention. Well 1 for pumping out groundwater in which water-soluble natural gas is dissolved, and natural gas is separated from groundwater, although not detailed, and part of the natural gas is used as a raw material for fuel and chemical industry There is a gas production plant 2 to be taken out, a pipeline 3 for transporting the pumped ground water from the well 1 to the gas production plant 2, and a piping system 4 for sending the compressed gas used for pumping the ground water from the gas production plant 2 to the well 1. is doing. The present invention is applied to this piping system 4. However, the present invention is not applied to the pipeline 3. In the gas production plant 2, an operation of taking out a useful component (for example, iodine) from the groundwater after the natural gas is separated may be performed.

  Here, the configuration of the well 1 and the principle of pumping out groundwater will be described with reference to the example shown in FIG. In the example shown in FIG. 2, a casing pipe 16, which is a perforated pipe 16 a having a large number of fine holes in the lower part, is inserted into the well of the well 1. It is connected. The blow pipe 5 connected to the piping system 4 is inserted into the pit via the head opening device 28, and connected to the pipeline 3 above the blow pipe 5 of the head opening device 28. The derivation | leading-out part 28a provided is provided.

  In this structure, gas is spouted from the front-end | tip of the blowing pipe 5 inserted in the mine in the state which the groundwater collected in the mine. Then, when the bubble b rises by buoyancy, the groundwater located above the gas ejection position is pushed up and pushed out. In this way, the technique of pumping out groundwater using the buoyancy of gas is generally called “gas lift method”. The groundwater thus pushed out of the well 1 is sent from the outlet 28 to the gas production plant 2 through the pipeline 3 shown in FIG. And in the gas production plant 2, the natural gas which melt | dissolved in groundwater is isolate | separated, and the part is taken out for using for various uses, such as city gas. On the other hand, of the natural gas, the gas left without being taken out for city gas or the like is returned to the well 1 through the piping system 4 and is blown out from the blowing pipe 5 into the well for performing the gas lift method. The configuration and operation of the gas production plant 2 are the same as those in the prior art, and will not be described in detail here.

  The piping system 4 includes a plurality of pipes 6 having a length of several tens to several kilometers, for example, a plurality of pipes 6 having a length of about 200 m, and extends in the ground between the well 1 and the gas production plant 2. ing. The pipe 6 is a metal tube such as iron, and is a thin tube having a diameter of about 50 mm or less. As shown in FIG. 3, a lining resin layer 7 for preventing internal corrosion having an average thickness of 1 mm or more is provided on the inner surface of the pipe 6. As described above, the water-soluble natural gas containing water (for example, in a steam saturated state) taken out from the ground water flows through the pipe 6. This gas has a high pressure (for example, 1 MPa or more) and a high temperature (for example, 30 ° C. to 60 ° C.), contains moisture (humidity), and contains various impurities. There is a problem that there is a risk of causing. This problem is only a problem when water-soluble natural gas containing impurities and moisture is transported in metal pipes, and is a new problem that has not occurred in various conventional piping systems with different applications. . In the present invention, a thick lining resin layer 7 having an average thickness of 1 mm or more on the inner surface of the pipe 6 that has not been considered in the past is formed to prevent inner surface corrosion. The inner surface of the pipe 6 is protected by the thick lining resin layer 7 for preventing internal corrosion and exhibits an unprecedented effect of improving durability without being corroded by the water-soluble compressed gas flowing inside. Can do.

  Strictly speaking, the pipe 6 having a length of several tens to several kilometers (for example, about 200 m) is also configured by connecting pipe members having a length of several meters (for example, about 3 m). It is common. That is, since it is difficult to form pipes 6 having a length of several tens of meters or more at the same time at the technical level at the time of filing of the present application, a large number of pipe members having a length of several meters are formed. In general, the pipe 6 having a length of several tens of meters or more is formed by connecting the two. Moreover, it is preferable that the pipe burying work or the lining resin layer forming work of the present invention is performed on the pipe 6 of several hundred m or less, specifically 200 m or less, and longer than that. It is difficult to work on the pipe 6 and work efficiency is poor. Therefore, a large number of pipe members having a length of about several meters are connected to form a pipe 6 having a length of about 200 m. The pipe 6 is buried in the ground, and the pipe 6 having a length of about 200 m is used as one unit. Work such as forming a lining resin layer is performed. After that, it is general to connect pipes 6 having a length of about 200 m to form a long piping system having a length of several kilometers. However, in the following description and drawings, for simplification of description, the description and illustration of the pipe 6 being configured by connecting a plurality of pipe members are omitted. If the pipe 6 having a length of several tens to several kilometers (for example, about 200 m) can be formed at a time, the pipe 6 is formed by connecting a plurality of pipe members as described above. There is no need to configure.

  Next, the manufacturing method of this piping system 4 and the apparatus for it are demonstrated. As schematically shown in FIG. 4, this piping system 4 connects a distance of several kilometers between the well 1 and the gas production plant 2, and a pipe 6, which is a metal pipe having a length of about 200 m. It's a combination of several, buried in the ground. A lining resin layer 7 is formed on each inner surface of the pipe 6. Specifically, when digging the ground and burying each pipe 6 in the ground, as shown in FIG. 5, working shafts 8 are provided at positions on both ends of each pipe 6. A work standpipe 9 is disposed inside and connected to both ends of the pipe 6. Then, the lining resin layer 7 for preventing internal corrosion described above is formed on the inner surface of each pipe 6. In forming the lining resin layer 7, a launcher 10, which is a lining resin supply device, is attached to one end of a pipe 6 to be processed via a work standpipe 9. At the other end of the pipe to be processed, a catcher 11 for receiving excess resin overflowing from the work standpipe 9 is disposed. Then, a predetermined amount of lining resin 7 a for preventing internal corrosion is supplied into the pipe 6 from the launcher 10 through the work standpipe 9. When the lining resin 7a is injected into the pipe 6, the ball pig 12 is disposed behind the lining resin 7a. Then, as schematically shown in FIG. 6, the ball pig 12 moves in the pipe 6 by applying pressure to the ball pig 12 in the pipe 6, and at that time, the outer peripheral surface of the ball pig 12 and the inner surface of the pipe 6 are moved. A lining resin layer 7 is formed in the gap therebetween. Therefore, if the inner diameter of the pipe is D1, the diameter of the ball pig is D2, and the thickness of the lining resin layer is T, (D1-D2) / 2 = T. In the present embodiment, for example, a ball pig 12 having D1 = 40 mm, T = 1 mm, and D2 = 38 mm is used.

  The conventional launcher 10 generally includes a container 20, a compressor (compressed air source) 14, and a compressed air supply mechanism 13. However, in the present embodiment, the compressor 14 is not included in the launcher 10 and is provided at an arbitrary position in the range from the well 1 to the gas production plant 2. This will be described below.

  When the compressor 14 is included in the launcher 10 as in the prior art, as shown in FIG. 5, the container 20 and the compression are formed near one end of a pipe (for example, the pipe 6A in FIG. 5) for forming the lining resin layer 7. The air supply mechanism 13 and the compressor 14 are arranged, the catcher 11 is arranged in the vicinity of the other end, and the injection of the lining resin 7a into the pipe 6A and the formation of the lining resin layer 7 in the pipe 6A are performed. Will do. In that case, after the formation of the lining resin layer 7 of one pipe 6A is completed, the container 20, the compressed air supply mechanism 13, and the compressor 14 are moved to one end of an adjacent pipe (for example, the pipe 6B in FIG. 6), and the other The catcher 11 is moved to the end of the lining, and the lining resin 7a is injected into the adjacent pipe 6B and the lining resin layer 7 is formed in the pipe 6B. After forming the lining resin layer 7 on all the pipes 6, the work standpipe 9 is removed and the pipes 6 are connected to each other. Further, as shown in FIG. 4, the pipe 6 at one end is connected to the blowing pipe 5 of the well 1. Then, the pipe 6 at the other end is connected to the gas production plant 2, and the piping system 4 is completed by connecting and processing with other members as necessary.

  By the way, usually, the well 1 for collecting water-soluble natural gas is often provided in an inconvenient area, and a plurality of wells 1 are often connected to one gas production plant 2. As described above, the piping system 4 that connects the gas production plant 2 and the well 1 may be as long as several kilometers, and between these several kilometers, it is difficult to enter a general vehicle such as a mountainous area. There are many. Therefore, as described above, the container 20 and the compressed air supply mechanism 13 and the compressor 14 are arranged at one end of each pipe 6, and each time the operation of one pipe 6 is completed, the container 20 and the compressed air are completed. When moving the supply mechanism 13 and the compressor 14, the carrying work is very difficult. This is because the range in which the container 20, the compressed air supply mechanism 13, and the compressor 14 can be carried on a general vehicle such as a truck is limited, and these can be transported using a special vehicle that can travel even in mountainous areas. This is because it is necessary for the operator to carry the section where the vehicle cannot enter by hand. In particular, in the technical field of the present invention (piping system 4 connected to the well 1 for collecting water-soluble natural gas), the compressor 14 is greatly transported in forming the lining resin layer 7 for preventing internal corrosion of the pipe 6. It is a burden. The catcher 11 can be anything as long as it can catch the overflowing resin and the protruding ball pig 12, and is easy to make a small and lightweight structure. . Further, since the container 20 and the compressed air supply mechanism 13 can be relatively reduced in size and weight, transportation is not so difficult. On the other hand, since it is difficult to reduce the size and weight of the compressor 14, it is very difficult to carry and is the biggest problem.

  Therefore, as a measure for reducing such a burden, the present applicant considered that the compressor 14 is not required to be transported. Specifically, as shown in FIG. 7, the compressor 14 is fixed at an arbitrary position in the range from the well 1 to the gas production plant 2, that is, a position most suitable for carrying in and installing the compressor 14. did. The temporary pipe 15 is temporarily connected from the pipe 6C closest to the compressor to the pipe 6B adjacent to the pipe 6A for forming the lining resin layer 7 to form a temporary pipe 15. Fifteen pipes 6C are connected to the compressor 14. In short, in this embodiment, the compressor 14 is not disposed in the vicinity of the pipe 6 </ b> A for forming the lining resin layer 7, but the compressed air can be supplied from the compressor 14 at a remote position via the temporary pipe 15. As in the case where the compressor 14 is disposed in the vicinity of the pipe 6A, injection of the lining resin 7a into the pipe 6A and formation of the lining resin layer 7 in the pipe 6A are performed using compressed air. I was able to do it. Therefore, since the position of the compressor 14 can be arbitrarily selected, the compressor 14 may be fixed by selecting an optimum position for transportation and installation. And it can utilize for the formation process of the lining resin layer 7 of all the pipes 6 by changing connection of the pipe 6 group which comprises the temporary piping 15 a little, without moving this compressor 14. FIG. The temporary pipe 15 is not formed separately for supplying compressed air, but the pipe 6 before or after the formation of the lining resin layer 7 before the completion of the piping system 4 is used as a working pipe. 9 are temporarily connected to each other temporarily. Therefore, the work cost and work time can be kept low, which is very efficient. As described above, it has never been considered at all to use the pipe 6 itself constituting the piping system 4 as the temporary piping 15 for supplying compressed air for forming the lining resin layer 7 of the pipe 6. Technology.

  Specifically, in the example shown in FIG. 7, the compressor 14 is fixed in the gas production plant 2, and the pipes 6 other than the single pipe 6 </ b> A to be formed with the lining resin layer 7 among the many pipes 6. Temporary pipes 15 extending from the gas production plant 2 to the pipe 6B adjacent to the pipe 6A are formed by temporarily connecting the working stand pipes 9 connected to the ends of the pipes to each other by the connecting portion 15a. That is, all the pipes 6 and the work standpipe 9 from the pipe 6B adjacent to the pipe 6A to be formed with the lining resin layer 7 to the pipe 6C closest to the compressor 14 are temporarily connected, The pipe 15 is formed and connected to a fixed compressor 14 in the gas production plant 2. And this temporary piping 15 is used in order to supply the compressed air used for injection | pouring of the lining resin 7a to the pipe 6A, and formation of the lining resin layer 7 in the pipe 6A. The pipe 6 constituting the temporary piping 15 may be before the lining resin layer 7 is formed or after the lining resin layer 7 is formed. Since the compressed air supplied from the compressor 14 does not normally contain impurities or moisture, there is almost no possibility of internal corrosion occurring in this process even in the pipe 6 before the lining resin layer 7 is formed.

  Here, the specific example of the injection | pouring process to the pipe 6A of the lining resin 7a in this embodiment and the formation process of the lining resin layer 7 in the pipe 6A is demonstrated in detail. First, prior to the step of injecting the lining resin 7a into the pipe 6A, one end of the pipe 6A to be formed with the lining resin layer 7 is connected to the container 20 and the other end is connected to the catcher 11. Then, a temporary pipe 15 is connected to the container 20 via the compressed air supply mechanism 13. As described above, the temporary pipe 15 is connected to the compressor 14 fixed to the gas production plant 2. Similarly to the above-described example, when supplying a predetermined amount of the lining resin 7a for preventing internal corrosion from the container 20 through the work standpipe 9 into the pipe 6A, the compressor 14 is operated, the temporary pipe 15 and the compression pipe 15 are compressed. Compressed air is supplied to the container 20 via the air supply mechanism 13. The lining resin 7a in the container 20 pressurized by the compressed air is injected into the pipe 6A. Subsequently, although not shown, the ball pig 12 is disposed behind the lining resin 7a in the pipe 6A, and the container 20 is removed from between the compressed air supply mechanism 13 and the pipe 6A, and the compressed air supply mechanism 13 and the pipe are removed. Connect 6A directly. Then, compressed air is supplied into the pipe 6 </ b> A through the temporary pipe 15 and the compressed air supply mechanism 13 using the compressor 14. The ball pig 12 pressurized by the compressed air moves in the pipe 6A while pushing the lining resin 7a. At this time, the lining resin layer 7 is formed in the gap between the outer peripheral surface of the moving ball pig 12 and the inner surface of the pipe 6A (see FIG. 5). Thus, both the injection of the lining resin 7a into the pipe 6A and the formation of the lining resin layer 7 by moving the ball pigs 12 are supplied from the fixed compressor 14 via the temporary pipe 15. Air is used. In this configuration, even if the compressor 14 is not located in the vicinity of the pipe 6 </ b> A for forming the lining resin layer 7, the compressed air supply mechanism 13, the temporary pipe 15, and a fixed position provided at an arbitrary position are used. With the compressor 14, it is possible to obtain an applied pressure for injecting the lining resin 7 a and forming the lining resin layer 7.

  As described above, according to the configuration shown in FIG. 7, among the container 20, the compressed air supply mechanism 13, the compressor 14, and the catcher 11, the largest and difficult-to-carry compressor 14 is placed at an arbitrary position (for example, the gas production plant 2 It is fixed to the inside) and transport is unnecessary. Thereby, the operation for forming the lining resin layer 7 on the inner surface of the pipe 6 is facilitated. In particular, when the device for this work is transported in a mountainous area where traffic is inconvenient, the compressor 14, which is the largest factor that is particularly large and heavy and difficult to transport, does not need to be transported, is relatively small and Since only the lightweight container 20, the compressed air supply mechanism 13, and the catcher 11 need to be transported, workability is very good. If only the container 20, the compressed air supply mechanism 13, and the catcher 11 are used, it is relatively easy for an operator to carry by hand without using a special vehicle even in a mountainous area.

  Next, a method for forming the lining resin layer 7 of the pipe 6 in one embodiment of the present invention will be described in detail.

  As described above, the present invention relates to a piping system 4 connected to a well 1 for collecting water-soluble natural gas, and causes a problem that internal corrosion occurs due to a gas containing impurities and moisture flowing in a pipe 6. Yes. Therefore, a lining resin layer 7 for preventing internal corrosion is formed on the inner surface of the pipe 6 (see FIG. 3). This lining resin layer 7 is made of a two-component mixed epoxy resin or the like in order to prevent internal corrosion, and is thicker than a resin layer for preventing gas leakage such as in Patent Documents 1 to 4 (average thickness). 1 mm or more) and highly viscous. In forming the lining resin layer 7, as described above, the lining resin 7 a is injected into the pipe 6 from the container 20, and then the ball pig 12 is injected into the pipe 6, and then the compressed air supply mechanism 13 is supplied from the compressor 14. Then, the lining resin 7a and the ball pig 12 are moved by sending compressed air into the pipe 6 through the pipe 6. In the case of the present invention, since a highly viscous lining resin is formed on the inner surface of the pipe 6 which is longer (about 200 m in length) and thinner (about 50 mm or less in diameter) than in the past, a very large amount is used. It is necessary to inject into the pipe 6 from the container 20 (for example, about 20 liters). In general, it is not easy to inject a large amount of the highly viscous lining resin 7 a into the thin pipe 6. Therefore, in this embodiment, a configuration is adopted in which the resin can be injected efficiently and the completion of the resin injection can be confirmed. One example will be described in detail.

8 and 9 show the configurations of the container 20 and the compressed air supply mechanism 13 of the present embodiment. The container 20 includes a lid 21 and a pressure gauge 17 that detects the pressure in the container 20. Further, the container 20 includes a drop lid 18, a rubber plate 19 positioned below the drop lid 18, and a guide 22 for smoothly moving the drop lid 18 up and down. The drop lid 18 is provided with a handle 27 for lifting manually.
On the other hand, the compressed air supply mechanism 13 connects the container 20 and the compressor 14, and includes a main plug valve 23, an air amount adjustment valve 24, a pressure reducing valve 25, and a flow meter 26.

  First, a predetermined amount (for example, 20 liters) of the lining resin 7a is accommodated in the container 20, and the rubber plate 19 and the drop lid 18 are placed on the lining resin 7a. Then, the main plug valve 23 is opened, and the compressed air of, for example, 0.8 MPa supplied from the compressor 14 is decompressed to, for example, 0.4 MPa by the pressure reducing valve 25. Further, the air flow rate adjustment valve 24 is adjusted while checking the flow meter 26, and the flow rate is set to 80 liters / minute, for example. In this way, pressure is applied to the drop lid 18 by sending compressed air from the compressor 14 through the compressed air supply mechanism 13 into the container 20. The dropping lid 20 to which pressure is applied in this manner descends along the guide 22, and accordingly, the lining resin 7a is injected from the container 20 into the pipe 6a.

  In this way, the lining resin 7a can be injected from the container 20 into the pipe 6 using compressed air. However, in order to efficiently shift to the subsequent lining process using the ball pig 12, the container 20 It is preferable to confirm that all of the inner lining resin 7a has been injected into the pipe 6 without a time lag. Therefore, in the present embodiment, the flow meter 26 and the pressure gauge 17 are monitored. At the start of injection of the lining resin 7a into the pipe 6, the flow meter indicates 80 liters / minute, and the pressure gauge 17 gradually increases from 0 MPa. When the drop lid 18 stops moving in the container 20, the pressure gauge 17 becomes 0.4 MPa, the same as the supplied compressed air, and the flowmeter 26 becomes 0 liter / min. In other words, the pressure gauge 17 indicates 0.4 MPa and the flow meter 26 indicates 0 liter / minute because all of the lining resin 7a in the container 20 disappears, and as shown by the two-dot chain line in FIG. And when the rubber plate 19 is brought into close contact with the lower surface of the container 20 and cannot move. In this way, the pressure in the container 20 measured by the pressure gauge 17 becomes the same pressure as the compressed air supplied from the compressed air supply mechanism 13 and is supplied into the container 20 measured by the flow meter 26. When the air flow rate becomes zero, it can be determined that all the lining resin 7a in the container 20 has been injected into the pipe 6.

  In this configuration, since the rubber plate 19 is disposed below the drop lid 18, if the pressurized drop lid 18 is lowered and the lining resin 7 a is injected into the pipe 6, the bottom of the container 20 Since the rubber plate 19 closes and closes the hole, there is no escape space for the supplied compressed air, and the pressure rises reliably. Then, when the pressure becomes 0.4 MPa, which is the same as the supplied compressed air, the pressure does not change. Further, if the compressed air continues to be supplied in a state where there is no escape space, the compressed air can no longer enter the container 20 after the container 20 is filled. That is indicated by the flow meter 17 indicating 0 liter / min. The completion of the injection of the lining resin 7a can be recognized by only one of the flow meter 26 and the pressure gauge 17, but in this embodiment, when the injection of the lining resin 7a is completed by using the flow meter 26 and the pressure gauge 17 together. The reliability of recognizing can be made very high, and the next process can be immediately performed.

  In order to reconfirm the completion of the injection of the lining resin 7a, although not shown, a liquid level inspection bar is inserted from above the container 20 and brought into contact with the upper surface of the drop lid 18, and the insertion length of the liquid level inspection bar is inserted. It is also possible to measure the thickness. When the insertion length matches the distance from the lid 21 to the upper surface of the drop lid 18 when the container 20 is empty, the completion of the injection of the lining resin 7a is confirmed again.

  As a method for confirming the completion of the injection of the lining resin 7a by a method other than the present embodiment, although not shown, a transparent window is provided in the container 20, and it is confirmed visually that the lining resin 7a has disappeared from the window. It is possible. However, if the highly viscous lining resin 7a adheres to the window portion from the inside, the inside cannot be seen through the window portion, and confirmation becomes impossible. In addition, it is conceivable that the lid 21 is opened and visually confirmed, or only by the liquid level inspection rod described above. In that case, when the lid 21 is opened or the liquid level inspection rod is inserted. If the injection of the lining resin 7a has not been completed, the lid 21 is closed again, or the liquid level inspection rod is removed, and then the compressed air is supplied again to pressurize the dropping lid 18 and inject the lining resin 7a. I have to resume. Accordingly, the work efficiency is very poor. On the other hand, even if the completion of injection of the lining resin 7a can be confirmed only by visual inspection with the lid 21 opened or by insertion of a liquid level inspection rod, the confirmation is not always immediately after completion of the injection of the lining resin. If the injection of the lining resin 7a has been completed and a certain amount of time has passed, if the completion of the injection is confirmed by opening the lid 21 or inserting a liquid level inspection rod, there is a waste of time. It will be. In any case, by confirming the completion of the injection of the lining resin 7a immediately and with high reliability, the effect of greatly improving the work efficiency is only visual inspection with the lid 21 opened and insertion of a liquid level inspection rod. Then it is impossible. Such an effect can be achieved for the first time by the present embodiment using the rubber plate 19 that can seal the hole in combination with the flow meter 26 and the pressure gauge 17.

  It should be noted that the completion of the injection of the lining resin 7a according to the present embodiment can be confirmed even when the compressor 14 is disposed in the vicinity of the container 20 and the compressed air supply mechanism 13, as shown in FIG. Even when it is arranged in the gas production plant 2), it can be adopted.

  In the above description, the lining resin 7a is injected from one end of the pipe 6, and the lining resin layer 7 is formed from one end to the other end using the ball pig 12 as shown in FIG. ing. Theoretically, a desired lining resin layer 7 is completed by such a method. However, in actuality, due to slight irregularities on the inner surface of the pipe 6, the lining resin layer 7 a may not be able to ensure a sufficient thickness over the whole, or application leakage may occur. Therefore, in order to prevent application leakage of the lining resin layer 7 and to ensure a sufficient thickness, after forming the lining resin layer 7 from one end to the other end, the other end to one end It is also possible to form the lining resin layer 7 again by overlapping. In that case, as shown in FIG. 10, the launcher 10 and the catcher 11 are prepared at both ends of the pipe 6, and as described above, the launcher 10 is first connected to one end and the other A catcher 11 is connected to the end of the first end, a predetermined amount of lining resin 7a is injected near one end, and the ball pig 12 is moved to form the lining resin layer 7 from one end to the other end. . The surplus lining resin 7a and the ball pig 12 are discharged from the other end and received by the catcher 11. Then, the catcher 11 is connected to one end, and the launcher 10 is reconnected to the other end. The excess lining resin 7a is injected near the other end, and the ball pig 12 is moved from the other end. The lining resin layer 7 is formed so as to overlap one end. If there is still a slight excess of the lining resin 7a, the lining resin 7a and the ball pig 12 are discharged from one end and received by the catcher 11. Note that the catcher 11 may be used as a substitute for the container 20 when the surplus lining resin 7a is injected near the other end.

  Thus, after forming the lining resin layer 7 from one end part to the other end part with respect to the pipe 6, the method of forming the lining resin layer 7 again from the other end part to the one end part is formed. 7, when the compressor 14 is used in a configuration in which the compressor 14 is disposed at an arbitrary position, the compressor is disposed on both sides (the well 1 side and the gas production plant 2 side) with the pipe 6A forming the lining resin layer 7 as a center. 14 is required. Therefore, considering the formation of the lining resin layer 7 in order for a large number of pipes 6 one by one, as shown in FIG. 11, the vicinity of the well 1 located at both ends of the piping system 4 and the gas production plant It is preferable to arrange the compressors 14 in the two. And the temporary piping 15 is each comprised on the both sides of the pipe 6A which forms the lining resin layer 7. FIG.

  As described above in detail, according to the present invention, a high-pressure (for example, 1 MPa or more) and high-temperature (for example, 30 ° C. to 60 ° C.) gas containing moisture (humidity) and various impurities circulates. Internal corrosion of the pipe 6 used for connecting between the well 1 for collecting groundwater containing water-soluble natural gas and the gas production plant 2 can be prevented by the lining resin layer 7 for preventing internal corrosion, The durability of the piping system 4 including the pipe 6 can be improved.

  Further, as shown in FIGS. 7 and 11, the compressor 14 as a compressed air source is not disposed in the vicinity of the pipe 6 </ b> A itself for forming the lining resin layer 7, but the range from the gas production plant 2 to the well 1. By fixing at an arbitrary position in the inside, that is, a position suitable for transportation and installation, a great amount of labor conventionally caused by transportation of the compressor 14 can be eliminated. Moreover, the supply of compressed air used for forming the lining resin layer 7 of the pipe 6A from the compressor 14 fixed at an arbitrary position is not provided with a dedicated pipe, but a group of pipes 6 other than the pipe 6A. By using the temporary pipe 15 configured by temporarily connecting the pipes 9 using the vertical pipes 9, it is possible to suppress an increase in work cost and work time, which is very efficient.

  As shown in FIGS. 8 and 9, the pressure in the container 20 is measured by the pressure gauge 17 using the container 20 containing the drop lid 18, and the measured value is transferred from the compressor 14 to the compressed air supply mechanism 13. By measuring the flow rate of the compressed air supplied to the container 20 from the compressor 14 via the compressed air supply mechanism 13 by the flow meter 26. It is highly reliable and can immediately detect that all the lining resin 7a in the container 20 has been injected into the pipe 6A. Therefore, it can transfer to the formation process of the following lining resin layer 7 efficiently, and work efficiency can be improved.

  Although the above description relates to a manufacturing method for newly manufacturing a piping system including a pipe having a lining resin layer for preventing internal corrosion on the inner surface, the present invention is a repair of an existing piping system. It can also be applied to.

  As an example, a lining resin layer for preventing internal corrosion is formed on the inner surface of a region including a portion to be repaired among pipes of an existing piping system. That is, as shown in FIG. 12, the pipe 6 is partially cut, and the region 6A including the portion to be repaired is cut off. Then, after the lining resin is injected into the separated region 6A including the portion to be repaired, the injected lining resin is applied to the entire inner surface of the region 6A including the portion to be repaired, and the thickness is increased. A lining resin layer having an average of 1 mm or more is formed. In the present embodiment, since the region including the portion to be repaired substantially corresponds to a pipe for forming the lining resin layer 7, the same symbol “6A” is given.

  More specifically, in the present embodiment, a shaft is formed, and the pipe 6 is partially cut in the shaft, so that the region 6A including a portion to be repaired is separated. In the shaft, a working vertical pipe 9 connected to each end of the pipe 6 is formed. A compressor (compressed air source) 14 is provided at an arbitrary position within the range from the gas production plant 2 to the well 1. In the example shown in FIG. 12, the compressor 14 is fixed in the gas production plant 2. Then, one end of the pipe 6 is connected to the compressor 14. On the other hand, the launcher 10 including the container 20 and the compressed air supply mechanism 13 is connected to the work standpipe 9 connected to the end of the region 6A including the portion to be repaired. Then, the work standpipe 9 connected to the other end of the pipe 6 connected to the compressor 14 is connected to the compressed air supply mechanism 13. Thus, the pipe 6 connected to the compressor 14 is used as a temporary pipe. That is, the pipe 6 connected to the compressor 14 fixed in the gas production plant 2 is used as a temporary pipe, and the compressed air supply mechanism 13 of the launcher 10 is connected to the work stand pipe 9 connected to the other end. Supply compressed air. Then, by using this compressed air, the lining resin is injected from the container 20 into the region 6A including the portion to be repaired, and the inner surface of the region 6A including the portion to be repaired is formed. .

  Although not shown, when the compressor 14 is fixed not at the gas production plant 2 but at an intermediate position of the pipe 6, a shaft is formed at a position close to the fixing position of the compressor 14, and the pipe 6 is partially connected within the shaft. Just cut it. Thereby, the area | region from the cutting location adjacent to the compressor 14 to the cutting location adjacent to the area | region 6A containing the part which should be repaired becomes one separated pipe. A cutting point close to the compressor 14 is connected to the compressor 14 via the work standpipe 9 and a cutting point adjacent to the region 6A including the portion to be repaired is connected via the work standpipe 9 to the launcher 10. Connected to the compressed air supply mechanism 13. Accordingly, the pipe 6 from the cutting point connected to the compressor 14 to the cutting point adjacent to the region 6A including the portion to be repaired is used as a temporary pipe. Then, by using the compressed air supplied from the compressor 14 via the temporary pipe, the lining resin is injected from the container 20 into the region 6A including the portion to be repaired, or the region including the portion to be repaired. The lining resin layer on the inner surface of 6A may be formed.

  According to such a method, since it is not necessary to transport the compressor 14 to the vicinity of the area 6A including the portion to be repaired, the operation can be facilitated.

  The example shown in FIG. 12 is a case where only a part of the piping system is repaired. On the other hand, when repairing the entire existing piping system, it is very difficult to process the entire long pipe constituting the piping system at once. Therefore, the entire pipe constituting the piping system is cut and divided into areas of a predetermined length or less (for example, every 200 m), and all the divided areas include the above-described parts to be repaired. Assuming 6A, the step of injecting the lining resin and the step of forming the lining resin layer may be performed sequentially. In this case, as in the example shown in FIG. 7, the compressor 14 is fixed at one place, and the pipe 6C adjacent to the compressor 14 to the pipe 6B adjacent to the region 6A including the portion to be repaired are intermediate. What is necessary is just to tentatively connect by connecting the standing work pipes 9 and to configure temporary piping. By carrying out like this, each area | region can be processed in order (injection of a lining resin and formation of a lining resin layer), without conveying the compressor 14 one by one. According to this method, workability can be remarkably improved.

  In the step of injecting the lining resin into the area including the portion to be repaired of the pipe, as described with reference to FIGS. A container 20 for containing a lining resin, which contains a rubber plate 19 located on the lower surface or below, is connected to one end of a region including a portion to be repaired. Then, with the compressor (compressed air source) 14 connected to the container 20, the compressed air is supplied from the compressor 14 to the container 20 to press the drop lid 18, and the position is below the drop lid 18 and the rubber plate 19. The lining resin to be extruded is pushed out of the container 20 into the region including the portion to be repaired. At that time, the pressure in the container 20 is measured by the pressure gauge 17, and the flow rate of the compressed air supplied from the compressor 14 to the container 20 is measured by the flow meter 26. When the pressure measured by the pressure gauge 17 matches the pressure of the compressed air supplied from the compressor 14 to the container 20 and the flow rate of the compressed air measured by the flow meter 26 becomes zero, the container 20 It is determined that the injection of the inner lining resin into the region including the portion to be repaired has been completed. Thereby, the completion of the injection of the lining resin can be confirmed immediately and with high reliability, and the working efficiency can be greatly improved.

  The method for forming the lining resin layer for repairing the pipe of the existing piping system may be the same as the step shown in FIG.

It is a schematic diagram of the whole installation containing the piping system of this invention, a well, and a gas production plant. It is sectional drawing which shows an example of the collection method of the groundwater in a well. It is sectional drawing of the pipe which comprises the piping system shown in FIG. It is a schematic diagram which shows the completion state of the piping system shown in FIG. It is a schematic diagram which shows an example of the manufacturing apparatus of the piping system of this invention. It is sectional drawing which shows the formation process of a lining resin layer. It is a schematic diagram which shows the other example of the manufacturing apparatus of the piping system of this invention. It is a block diagram which shows an example of the container of the manufacturing apparatus of the piping system of this invention, and a compressed air supply mechanism. It is a block diagram which shows the member inside the container shown in FIG. It is a schematic diagram which shows the other example of the manufacturing apparatus of the piping system of this invention. It is a schematic diagram which shows the other example of the manufacturing apparatus of the piping system of this invention. It is a schematic diagram for demonstrating the repair method of the piping system of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Well 2 Gas production plant 3 Pipeline 4 Piping system 5 Blowing pipe 6 Pipe 6A Pipe which forms the lining resin layer (area including the part which should be repaired)
6B Adjacent pipe 6C Pipe 7 closest to the compression supply source 7 Lining resin layer 7a Lining resin 8 Vertical shaft 9 Work vertical pipe 10 Launcher 11 Catcher 12 Ball pig 13 Compressed air supply mechanism 14 Compressor (compressed air source)
15 Temporary piping 15a Connection part 16 Casing pipe 16a Perforated pipe 17 Pressure gauge 18 Drop lid 19 Rubber plate 20 Container 21 Lid 22 Guide 23 Main plug valve 24 Air amount adjustment valve 25 Pressure reducing valve 26 Flow meter 27 Handle 28 Anti-mouth device 28a Derived Part b Bubble

Claims (11)

A piping system that connects a well for collecting groundwater containing water-soluble natural gas and a gas production plant, and a lining resin layer is formed on the inner surface to prevent internal corrosion and is embedded in the ground. an apparatus for manufacturing a piping system in which a plurality of pipes is Ru is configured by connecting circulating the compressed gas containing cage moisture,
Before connecting the plurality of pipes, temporary connection of pipes other than the pipe for forming the lining resin layer is performed, and the temporary connection is provided at each end position of each pipe. The piping system manufacturing apparatus which is made | formed by connecting work standing pipes which are arrange | positioned in the working shaft and were respectively connected to the edge part of each said pipe. The piping system manufacturing apparatus according to claim 1, wherein the lining resin layer having an average thickness of 1 mm or more is formed . A pipe system manufacturing method comprising a pipe that circulates compressed gas containing moisture embedded in the ground and connecting a well for collecting groundwater containing water-soluble natural gas and a gas production plant,
Forming a lining resin layer for inner surface corrosion prevention on the inner surface of the pipe ;
Injecting a lining resin into the pipe before the step of forming the lining resin layer,
In the step of injecting the lining resin into the pipe,
A container for containing the lining resin, which incorporates a vertically movable drop lid and a rubber plate located below or below the drop lid, is connected to one end of the pipe and compressed into the container With the air source connected, the drop lid is pressed by supplying compressed air from the compressed air source to the container, and the lining resin positioned below the drop lid and the rubber plate is placed in the container. Extruded into the pipe,
The pressure in the container is measured by a pressure gauge, the flow rate of the compressed air supplied from the compressed air source to the container is measured by a flow meter, and the pressure measured by the pressure gauge is the compressed air. In the pipe of the lining resin in the container when the pressure of the compressed air supplied from the source to the container matches the pressure of the compressed air measured by the flow meter becomes zero Detecting the completion of injection into the
Manufacturing method of piping system. The manufacturing method of the piping system of Claim 3 which forms the said lining resin layer so that thickness may become 1 mm or more on average. A manufacturing method of a piping system configured by connecting a plurality of the pipes,
Before the step of connecting a plurality of the pipes and before the step of forming the lining resin layer,
Provide a compressed air source at any position within the range from the gas production plant to the well,
Out of the plurality of pipes, all the pipes from the pipe adjacent to the one pipe for forming the lining resin layer to the pipe closest to the compressed air source are connected to both ends of each pipe. By connecting work standpipes arranged in work shafts respectively provided at the positions of the pipes and connected to the end portions of the pipes, they are temporarily connected temporarily to the compressed air source. By connecting the pipe close to the compressed air source, the temporary air reaching the adjacent pipe from the compressed air source through the temporarily connected pipe other than the pipe for forming the lining resin layer. Configure the piping,
The manufacturing method of the piping system according to claim 3 or 4 , wherein the pipe for forming the lining resin layer is indirectly connected to the adjacent pipe. The pipe for forming the lining resin layer is connected to the adjacent pipe via a container for storing the lining resin and a compressed air supply mechanism,
Compressed air is supplied to the container from the compressed air source provided at an arbitrary position through the temporarily connected pipe other than the pipe for forming the lining resin layer and the compressed air supply mechanism. And pressurizing the lining resin with compressed air supplied to the container and pushing it out of the container into the pipe,
The manufacturing method of the piping system of Claim 5 . A pipe system for repairing a piping system that connects a well for collecting groundwater containing water-soluble natural gas and a gas production plant, consisting of a pipe that circulates compressed gas containing moisture embedded in the ground,
Look including the step of forming a lining resin layer for preventing the inner surface corrosion anywhere on the inner surface of the pipe,
Before the step of forming the lining resin layer, the step of partially cutting the pipe to separate the region including the portion to be repaired, and injecting the lining resin into the region including the portion to be repaired Including a process,
In the step of injecting the lining resin into the region including the portion to be repaired of the pipe,
Connected to one end of the region including the portion to be repaired is a container for housing the lining resin, which has a built-in drop lid that can be moved up and down and a rubber plate located below or below the drop lid. Then, in a state where a compressed air source is connected to the container, the compressed lid is pressed against the drop lid by supplying compressed air from the compressed air source to the container, and is positioned below the drop lid and the rubber plate. Extruding the lining resin from the container to the inside of the region including the portion to be repaired,
The pressure in the container is measured by a pressure gauge, the flow rate of the compressed air supplied from the compressed air source to the container is measured by a flow meter, and the pressure measured by the pressure gauge is the compressed air. The repair of the lining resin in the container when the pressure of the compressed air supplied from the source to the container matches the pressure of the compressed air measured by the flow meter becomes zero Detecting the completion of the injection into the area containing the part to be
How to repair the piping system. The repair method of the piping system according to claim 7 , wherein the lining resin layer is formed to have an average thickness of 1 mm or more. Before the step of forming the lining resin layer, and cutting the pipe partially, the step of disconnecting the region including the portion to be repaired, the lining resin into the interior of the region including the repaired portion to be implanted Including the steps of:
Before the step of injecting the plastic lining the interior of a region including a portion to be the repair
Provide a compressed air source at any position within the range from the gas production plant to the well,
The pipe is cut at a position close to the compressed air source, the cut portion is connected to the compressed air source, and the cut portion connected to the compressed air source is connected to the region including the portion to be repaired. The repair method for a piping system according to claim 7 or 8 , wherein up to adjacent cutting points are temporary piping for supplying compressed air. One end of a region including the portion to be repaired of the pipe is connected to a cutting portion adjacent to the region including the portion to be repaired through a container for storing the lining resin and a compressed air supply mechanism,
Wherein in the step of injecting the plastic lining the interior of a region including a portion to be repaired, from the compressed air source provided at an arbitrary position, through the provisional piping and said compressed air supply mechanism, the container Compressed air is supplied to the container, and the lining resin is pressurized by the compressed air supplied to the container and pushed out of the container into the pipe.
The piping system repair method according to claim 9 . The entire pipe is divided into regions of a predetermined length or less, and the step of injecting the lining resin and the step of forming the lining resin layer as regions including the parts to be repaired are sequentially performed. carry out,
A method of repairing a pipe system according to any one of claims 7 10.

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