Hot nitrogen unblocking and jam releasing device for oil field exploitation

Abstract

The utility model discloses a hot nitrogen unblocking and jam releasing device for oilfield exploitation. The hot nitrogen unblocking and jam releasing device comprises a nitrogen heating structure, a gas injection structure and a residual gas recovery structure. According to the hot nitrogen blockage and jam releasing device for oil field exploitation, firstly, the heat preservation cylinder is filled with a liquid heat exchange medium, when an external nitrogen supply system inputs nitrogen into the gas inlet pipe, the nitrogen enters the nitrogen heating structure for heat exchange heating, and the heated nitrogen is pressurized by the booster pump and then conveyed into an oil field pipeline along the gas injection pipe; paraffin in the oil field pipeline can be dissolved by utilizing the high-temperature nitrogen, so that the oil field pipeline can be dredged, unblocked and unblocked, and along with the increase of the nitrogen in the oil field pipeline, part of the high-temperature nitrogen can enter the residual gas recovery structure along the exhaust pipe; and the recovered nitrogen is conveyed to the three-way pipe again and then continuously enters the nitrogen heating structure to heat the recovered nitrogen, so that on one hand, the waste of the nitrogen is avoided, and on the other hand, the loss of heat exchange is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of unblocking and unjamming oil field pipelines, in particular to a device for unblocking and unjamming oil field pipelines using hot nitrogen. Background Art

[0002] During oilfield production, paraffin wax, a component of crude oil, crystallizes and precipitates as the oil temperature drops, gradually depositing on the inner walls of oilfield pipelines. For example, during the transportation of produced fluid from relatively low-temperature oil wells, the temperature of the crude oil continuously drops from the bottom of the well to the surface, causing paraffin wax to precipitate and adhere to the pipeline walls. Over time, this accumulation can lead to pipeline blockage.

[0003] China Authorization Publication No. CN213838584U discloses a nitrogen controlled deblocking and unblocking device, comprising a carrier vehicle and a skid-mounted deblocking and unblocking system. The deblocking and unblocking system includes a skid-mounted baseplate, a nitrogen generator, a nitrogen heater, a diesel generator, a high-temperature gas booster pump, a gas storage tank, a gas pressure sensor, an electrical controller, and a distribution box. The nitrogen generator is connected to the nitrogen heater via an outlet pipe, which is in turn connected to the high-temperature gas booster pump via a connecting pipe. The high-temperature gas booster pump is connected to the gas storage tank, which is in turn connected to an exhaust pipe equipped with a solenoid valve and a gas flow meter. A quick connector is installed at the end of the exhaust pipe. The gas pressure sensor is located within the gas storage tank. The outlet pipe and connecting pipe are each equipped with a check valve. The electrical controller is located within the distribution box and is connected to the nitrogen generator, nitrogen heater, high-temperature gas booster pump, gas pressure sensor, and solenoid valve via cables. This device achieves high deblocking efficiency and excellent deblocking results.

[0004] However, this device has the following drawbacks: after injecting high-temperature nitrogen into the oilfield pipeline, some of the high-temperature nitrogen is discharged into the atmosphere along the oilfield pipeline's nozzle, making it impossible to effectively recycle the discharged high-temperature nitrogen. To address this drawback, we propose a device for deblocking and unblocking oilfields using hot nitrogen. Utility Model Content

[0005] The purpose of the utility model is to provide a device for removing blockage and jamming by using hot nitrogen in oil field development, so as to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a device for removing blockages and jams by using hot nitrogen in oilfield development, comprising:

[0007] A nitrogen heating structure comprising an insulation cylinder, an electric heating plate fixedly mounted on the inner wall of the insulation cylinder, and a heat exchange coil fixedly mounted on the inner wall of the insulation cylinder, wherein the left end of the heat exchange coil extends to the outside of the insulation cylinder and is fixedly mounted with a tee pipe;

[0008] An air injection structure, comprising a cover plate threadedly connected to the upper end of the oilfield pipeline, an air injection pipe and an exhaust pipe fixedly mounted on the upper surface of the cover plate, and a booster pump fixedly mounted on the left end of the air injection pipe;

[0009] The residual gas recovery structure includes a recovery cylinder and a recovery pipe fixedly installed on the upper surface of the recovery cylinder, and a filter assembly is arranged inside the recovery cylinder.

[0010] Preferably, the right end of the heat exchange coil extends to the outside of the heat preservation tube and is fixedly connected to the air inlet end of the booster pump.

[0011] Preferably, the left end of the recovery pipe is fixedly connected to the upper end of the tee pipe.

[0012] Preferably, an air intake pipe is fixedly installed at the left end of the three-way pipe, a flow control valve is fixedly installed on the surface of the air intake pipe, and one-way valves are provided on the surfaces of the air intake pipe and the recovery pipe, and the other end of the air intake pipe is connected to an external nitrogen supply system.

[0013] Preferably, one end of the gas injection pipe and the gas exhaust pipe both extend to the interior of the oilfield pipeline.

[0014] Preferably, the filter assembly includes a filter screen fixedly mounted on the top of the recovery cylinder, and a pressure relief pipe fixedly mounted on the surface of the recovery cylinder, and a pressure relief valve is provided on the surface of the pressure relief pipe, and one end of the recovery pipe extends to the interior of the filter screen.

[0015] Preferably, one end of the exhaust pipe away from the cover plate extends to the interior of the recovery cylinder.

[0016] Beneficial effects

[0017] The utility model provides a device for removing blockage and jamming by using hot nitrogen in oil field development, which has the following beneficial effects:

[0018] 1. The oilfield is developed with a hot nitrogen unblocking and unjamming device. By setting up a nitrogen heating structure and a residual gas recovery structure, the liquid heat exchange medium is first filled in the insulation cylinder. When the external nitrogen supply system inputs nitrogen into the air inlet pipe, the nitrogen will enter the nitrogen heating structure for heat exchange and heating. The heated nitrogen will be pressurized by the booster pump and transported to the oilfield pipeline along the air injection pipe. The high-temperature nitrogen can dissolve the paraffin in the oilfield pipeline, thereby clearing the oilfield pipeline and unblocking it. As the nitrogen in the oilfield pipeline increases, some of the high-temperature nitrogen will enter the residual gas recovery structure along the exhaust pipe, and will be re-transported to the tee pipe and continue to enter the nitrogen heating structure to heat the recovered nitrogen. On the one hand, this avoids the waste of nitrogen, and on the other hand, it reduces the loss of heat exchange.

[0019] 2. The oil field uses a hot nitrogen unblocking and unblocking device. By setting a filter component, when the exhaust pipe transports the recovered nitrogen to the recovery cylinder, the nitrogen will pass through the filter and enter the recovery pipe. The filter can filter out impurities carried by the nitrogen. Moreover, when the pressure in the recovery cylinder increases, the pressure relief valve opens and the excess gas in the recovery cylinder will be discharged into the outside atmosphere along the pressure relief pipe, thereby protecting the entire pipeline of the device and avoiding the problem of pipeline damage caused by excessive pressure in the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the three-dimensional structure of the utility model;

[0021] Figure 2 This is a schematic diagram of the front cross-section structure of the insulation tube of the utility model;

[0022] Figure 3 This is a schematic diagram of the side sectional structure of the cover plate of the utility model;

[0023] Figure 4 This is a schematic diagram of the side sectional structure of the recovery drum of the utility model.

[0024] In the figure: 10 insulation cylinder, 11 heating plate, 12 heat exchange coil, 13 tee pipe, 20 oil field pipeline, 21 cover plate, 22 gas injection pipe, 23 exhaust pipe, 24 booster pump, 30 recovery cylinder, 31 recovery pipe, 40 air inlet pipe, 41 flow control valve, 42 one-way valve, 50 filter screen, 51 pressure relief pipe, 52 pressure relief valve. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] See also Figure 1-4 The utility model provides a technical solution: a device for unblocking and unstuck by using hot nitrogen in oil field development, comprising: a nitrogen heating structure, a gas injection structure and a residual gas recovery structure.

[0027] See Figure 2 The nitrogen heating structure includes an insulation tube 10, an electric heating plate 11 fixedly installed on the inner wall of the insulation tube 10, and a heat exchange coil 12 fixedly installed on the inner wall of the insulation tube 10, and the left end of the heat exchange coil 12 extends to the outside of the insulation tube 10 and is fixedly installed with a three-way pipe 13.

[0028] Liquid heat exchange medium is filled into the insulation cylinder 10, and then the electric heating plate 11 is driven to heat the liquid heat exchange medium. When nitrogen passes through the heat exchange coil 12, the liquid heat exchange medium will heat the nitrogen in the heat exchange coil 12.

[0029] An air intake pipe 40 is fixedly mounted on the left end of the tee pipe 13. A flow control valve 41 is fixedly mounted on the surface of the air intake pipe 40. The other end of the air intake pipe 40 is connected to an external nitrogen supply system. When the external nitrogen supply system inputs nitrogen into the air intake pipe 40, the nitrogen will enter the heat exchange coil 12. By adjusting the size of the flow control valve 41, the flow rate of the external nitrogen supply system supplying air to the heat exchange coil 12 can be changed.

[0030] See Figure 1 and Figure 3 The gas injection structure includes a cover plate 21 threadedly connected to the upper end of the oilfield pipeline 20, an injection pipe 22 and an exhaust pipe 23 fixedly mounted on the upper surface of the cover plate 21, and a booster pump 24 fixedly mounted on the left end of the gas injection pipe 22. The right end of the heat exchange coil 12 extends to the outside of the insulation tube 10 and is fixedly connected to the air inlet end of the booster pump 24. One end of the gas injection pipe 22 and the exhaust pipe 23 both extend to the interior of the oilfield pipeline 20.

[0031] When the external nitrogen supply system inputs nitrogen into the air inlet pipe 40, the nitrogen will enter the nitrogen heating structure for heat exchange heating. The heated nitrogen will be pressurized by the booster pump 24 and then transported along the air injection pipe 22 to the oilfield pipeline 20. The high-temperature nitrogen can dissolve the paraffin in the oilfield pipeline 20, thereby clearing the oilfield pipeline 20 and unblocking it.

[0032] See Figure 1 and Figure 4 The residual gas recovery structure includes a recovery cylinder 30, and a recovery pipe 31 fixedly installed on the upper surface of the recovery cylinder 30, and a filter assembly is provided inside the recovery cylinder 30, the left end of the recovery pipe 31 is fixedly connected to the upper end of the three-way pipe 13, and the exhaust pipe 23 extends to the interior of the recovery cylinder 30 at one end away from the cover plate 21, and a one-way valve 42 is provided on the surface of the intake pipe 40 and the recovery pipe 31. The one-way valve 42 on the surface of the intake pipe 40 can prevent the gas in the three-way pipe 13 from entering the intake pipe 40, and the one-way valve 42 on the surface of the recovery pipe 31 can prevent the gas in the three-way pipe 13 from entering the recovery pipe 31.

[0033] The filter assembly includes a filter screen 50 fixedly mounted on the top of the recovery cylinder 30, and a pressure relief pipe 51 fixedly mounted on the surface of the recovery cylinder 30, and a pressure relief valve 52 is provided on the surface of the pressure relief pipe 51, and one end of the recovery pipe 31 extends to the interior of the filter screen 50.

[0034] As the nitrogen in the oilfield pipeline 20 increases, part of the high-temperature nitrogen will be transported along the exhaust pipe 23 to the recovery cylinder 30, and the nitrogen will pass through the filter 50 into the recovery pipe 31, and the filter 50 can filter impurities carried in the nitrogen.

[0035] When part of the high-temperature nitrogen enters the residual gas recovery structure along the exhaust pipe 23, the filtered high-temperature nitrogen can be re-transported to the three-way pipe 13 and then continue to enter the nitrogen heating structure to heat the recovered nitrogen. At this time, it is necessary to adjust the flow control valve 41 to reduce the amount of nitrogen transported by the intake pipe 40, which avoids the waste of nitrogen on the one hand and reduces the loss of heat exchange on the other hand.

[0036] When part of the high-temperature nitrogen continues to enter the residual gas recovery structure along the exhaust pipe 23, the pressure in the recovery cylinder 30 will increase. At this time, the pressure relief valve 52 opens, and the excess gas in the recovery cylinder 30 will be discharged into the outside atmosphere along the pressure relief pipe 51, thereby protecting the entire pipeline of the device and avoiding the problem of pipeline damage caused by excessive pressure in the pipeline.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for removing blockage and jam using hot nitrogen in oil field development, characterized in that: include: A nitrogen heating structure, comprising a heat preservation tube (10), an electric heating plate (11) fixedly mounted on the inner wall of the heat preservation tube (10), and a heat exchange coil (12) fixedly mounted on the inner wall of the heat preservation tube (10), wherein the left end of the heat exchange coil (12) extends to the outside of the heat preservation tube (10) and is fixedly mounted with a three-way pipe (13); An air injection structure, comprising a cover plate (21) threadedly connected to the upper end of an oilfield pipeline (20), an air injection pipe (22) and an exhaust pipe (23) respectively fixedly mounted on the upper surface of the cover plate (21), and a booster pump (24) fixedly mounted on the left end of the air injection pipe (22); The residual gas recovery structure comprises a recovery cylinder (30) and a recovery pipe (31) fixedly mounted on the upper surface of the recovery cylinder (30), and a filter assembly is arranged inside the recovery cylinder (30).

2. The device for removing blockage and jamming by using hot nitrogen in oilfield development according to claim 1, characterized in that: The right end of the heat exchange coil (12) extends to the outside of the heat preservation tube (10) and is fixedly connected to the air inlet end of the booster pump (24).

3. The device for removing blockage and jam using hot nitrogen in oilfield development according to claim 1, characterized in that: The left end of the recovery pipe (31) is fixedly connected to the upper end of the three-way pipe (13).

4. The device for removing blockage and jamming by using hot nitrogen in oilfield development according to claim 3, characterized in that: An air intake pipe (40) is fixedly mounted on the left end of the three-way pipe (13), a flow control valve (41) is fixedly mounted on the surface of the air intake pipe (40), and one-way valves (42) are provided on the surfaces of the air intake pipe (40) and the recovery pipe (31), and the other end of the air intake pipe (40) is connected to an external nitrogen supply system.

5. The device for removing blockage and jam using hot nitrogen in oilfield development according to claim 1, characterized in that: One end of the gas injection pipe (22) and the gas exhaust pipe (23) both extend into the interior of the oilfield pipeline (20).

6. The device for removing blockage and jam using hot nitrogen in oilfield development according to claim 1, characterized in that: The filter assembly comprises a filter screen (50) fixedly mounted on the top of the recovery cylinder (30), and a pressure relief pipe (51) fixedly mounted on the surface of the recovery cylinder (30), wherein a pressure relief valve (52) is provided on the surface of the pressure relief pipe (51), and one end of the recovery pipe (31) extends to the interior of the filter screen (50).

7. The device for removing blockage and jam using hot nitrogen in oilfield development according to claim 1, characterized in that: One end of the exhaust pipe (23) away from the cover plate (21) extends to the interior of the recovery cylinder (30).

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