Vertical total mechanism convenient for pressure test and backflow prevention

Abstract

The utility model discloses a vertical general mechanism convenient for pressure test and backflow prevention, which relates to the technical field of oil and gas gathering and transportation and comprises a single-quantity gathering pipe, an oil gathering pipe and a pipeline from the general mechanism to an accident tank. The single-quantity gathering pipe and the oil gathering pipe are arranged in parallel, two ends of the plurality of pipelines from the main mechanism to the accident tank are connected with the single-quantity gathering pipe and the oil gathering pipe through steel wedge type gate valves, one end of the oil gathering pipe is connected with a heating type ball collecting barrel, the other end of the oil gathering pipe is connected with one end of the dosing pipeline, and the other end of the dosing pipeline is connected with a scale inhibitor dosing tank; the pipeline from the main mechanism to the accident tank is connected with a well group oil incoming pipeline through a swing check valve and a steel wedge gate valve; according to the utility model, the defects that a three-way pipeline, a valve and a ball blocking net need to be disassembled in the process of flow switching, the operation difficulty and workload are high, the operation efficiency is low, and the risk of crude oil and gas leakage exists as the single well group pipeline needs to be decompressed in the disassembly process are overcome.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil and gas gathering and transportation, in particular to a general manifold for oil and gas gathering and transportation processes, and specifically to a vertical general manifold that is convenient for pressure testing and preventing backflow. Background Technique

[0002] In recent years, with the continuous deepening of oilfield development, the risk of pipeline failure and leakage of various oil gathering pipelines has been increasing due to the extension of service time. After individual pipelines leak, the general manifold has backflow due to pressure, and the safety and environmental protection situation is prominent. This problem not only affects the normal production of the oilfield but also poses a severe challenge to the safety and environmental protection situation. Therefore, oilfield enterprises actively promote the work of clean water pressure testing and scale removal to ensure the safe and stable operation of pipelines.

[0003] As a pipe manifold device for the oil coming from well groups during the crude oil production process, the vertical general manifold is widely used in conventional booster stations. Its main function is to realize the switching of processes such as the combination of liquid volumes of different well groups, metering of different well groups, clean water pressure testing, and pipeline scale removal by switching the process. However, it has been found in the use of the existing general manifold that during the scale removal operation and clean water pressure testing operation, during the process switching, it is necessary to disassemble the three-way pipeline, valves, and ball blocking nets, with high operation difficulty and workload, low operation efficiency. At the same time, during the disassembly process, it is necessary to relieve the pressure of the single well group pipeline, and there is a risk of crude oil and gas leakage. Therefore, there is an urgent need for a vertical general manifold that is convenient for pressure testing and preventing backflow, which can solve the problems of high operation difficulty, complex process, large workload, low operation efficiency, and the risk of crude oil and gas leakage during the disassembly process. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a vertical general manifold that is convenient for pressure testing and preventing backflow, by installing a swing check valve and a steel wedge gate valve at the front end of the general manifold to overcome the deficiencies of the prior art that during the scale removal operation and clean water pressure testing operation, during the process switching, it is necessary to disassemble the three-way pipeline, valves, and ball blocking nets, with high operation difficulty and workload, low operation efficiency, and at the same time, during the disassembly process, it is necessary to relieve the pressure of the single well group pipeline, and there is a risk of crude oil and gas leakage.

[0005] The utility model provides a vertical general manifold that is convenient for pressure testing and preventing backflow. To achieve the above purpose, the following technical solutions are adopted:

[0006] It includes a single-volume manifold, an oil gathering manifold, and a pipeline from the general manifold to the accident tank;

[0007] The single - volume manifold is arranged in parallel with the oil - gathering manifold. Steel wedge - type gate valves are provided at both ends of multiple main - manifold - to - accident - tank pipelines and are respectively connected to the single - volume manifold and the oil - gathering manifold. One end of the oil - gathering manifold is connected to a heating - type pig receiver, and the other end of the oil - gathering manifold is connected to one end of a chemical - dosing pipeline. The other end of the chemical - dosing pipeline is connected to a scale inhibitor dosing tank. The chemical - dosing pipeline is used for dosing the liquid gathered from the main - manifold in the station to prevent scale formation and corrosion in the gathering pipeline.

[0008] The main - manifold - to - accident - tank pipeline is connected to a swing - check valve. The swing - check valve is connected to a steel wedge - type gate valve and is also connected to the well - group oil - incoming pipeline. The well - group oil - incoming pipeline is flange - connected to the steel wedge - type gate valve. By opening or closing the steel wedge - type gate valve, the liquid from the well group can be connected to or cut off from the station process, conveniently realizing the process switching for scale cleaning or water pressure testing. The swing - check valve and the steel wedge - type gate valve are flange - connected, which is used to prevent the reverse flow of the oil in other well - group incoming pipelines of the main - manifold through the oil - gathering manifold due to the pressure drop caused by pipeline leakage in the well - group oil - incoming pipeline during normal oil - gathering production, reducing pollution.

[0009] Further, the left end of the single - volume manifold is connected to the main - manifold - to - accident - tank pipeline with a steel wedge - type gate valve, which is used for the emergency liquid - inlet process to the accident tank. The right end of the single - volume manifold is connected to a steel wedge - type gate valve, and a main - manifold purging reserved head is connected to the steel wedge - type gate valve, which is used for the single - well single - volume and the station pipeline purging process. Close the steel wedge - type gate valve on the well - group oil - incoming pipeline connected to the single - volume manifold, open the steel wedge - type gate valve connected to the main - manifold - to - accident - tank pipeline, and connect the pipeline of the cement truck to the main - manifold purging reserved head to clean and purge the single - volume manifold of the main - manifold.

[0010] Further, the right end of the single - volume manifold is connected to the main - manifold - to - in - station single - volume meter pipeline with a steel wedge - type gate valve. The main - manifold - to - in - station single - volume meter pipeline is welded to the single - volume manifold and is used for measuring the single - volume liquid volume.

[0011] Further, one end of the oil - gathering manifold connected to the chemical - dosing pipeline is connected to an oil - gathering manifold purging reserved head.

[0012] Further, well - group oil - incoming sampling ports are connected to the well - group oil - incoming pipelines, through which comprehensive samples of the liquid from the well group can be taken to master the water - cut change of the crude oil in the well group.

[0013] Further, the single - volume manifold is also connected to an internal - thread gate valve, and a pressure transmitter is connected to the internal - thread gate valve. The pressure transmitter is used for monitoring the gathering pressure.

[0014] Further, one side of the heating - type pig receiver is connected to the oil - gathering manifold through a steel wedge - type gate valve. The other side of the heating - type pig receiver is connected to the main - manifold - to - heating - furnace pipeline with a steel wedge - type gate valve. A bypass pipeline is connected between the oil - gathering manifold and the main - manifold - to - heating - furnace pipeline, and a steel wedge - type gate valve is provided on the bypass pipeline.

[0015] Furthermore, flange covers are provided at both ends of the single - volume manifold for blind plugging, which facilitates the cleaning of the pipeline.

[0016] Furthermore, pressure transmitters are installed on each oil pipeline from the well group to be used for transmitting pressure data to the station control system in real - time. Pressure transmitters are also installed on the oil - collecting manifolds on both sides of the heating - type pig receiver and on the pipeline from the main manifold to the heating furnace.

[0017] Furthermore, the swing check valve is connected to the single - volume manifold and the oil - collecting manifold through a tee pipeline and is used for switching the process for gathering and transportation or the liquid volume of the single - volume well group.

[0018] Compared with the prior art, the utility model has the following beneficial technical effects:

[0019] The utility model provides a vertical main manifold that is convenient for pressure testing and preventing back - flow. A swing check valve and a steel wedge - type gate valve are installed at the front end (oil inlet) of the main manifold. By closing the steel wedge - type gate valve connected to the oil pipeline from the well group and disassembling the swing check valve, direct clean - water pressure testing or pipeline scale removal operations can be carried out. During the disassembly process, it is not necessary to relieve the pressure of the oil pipeline from the well group, avoiding the risk of crude oil and gas leakage and reducing the safety and environmental protection risks brought by pipeline pressure relief. During the process of process switching, it is not necessary to remove the tee pipeline, valves, and ball - blocking nets. At the same time, the swing check valve can prevent back - flow leakage caused by the pressure drop due to pipeline leakage of crude oil during daily operation, reducing the operation difficulty, workload, and improving the operation efficiency during the process of daily scale removal of the oil pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of an overall vertical main manifold that is convenient for pressure testing and preventing back - flow in an embodiment of the utility model.

[0021] In the figure, 1. Flange cover; 2. Pressure transmitter; 3. Internal - thread gate valve; 4. Single - volume manifold; 5. Reserved head for purging of the main manifold; 6. Oil - collecting manifold; 7. Heating - type pig receiver; 8. Pipeline from the main manifold to the heating furnace; 9. Pipeline from the main manifold to the in - station single - volume meter; 10. Scale inhibitor dosing tank; 11. Dosing pipeline; 12. Oil pipeline from the well group; 13. Purging head of the oil - collecting manifold; 14. Sampling port for the oil from the well group; 15. Steel wedge - type gate valve; 16. Swing check valve; 17. Pipeline from the main manifold to the accident tank. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] To enable those skilled in the art to better understand the solution of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0023] It should be noted that the terms "first", "second", etc. in the description and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present utility model described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0024] The present utility model provides a vertical main unit that is convenient for pressure testing and anti-backflow, and is used to solve the problems of complicated process switching and low efficiency in the daily work of descaling and pressure testing of oil pipelines.

[0025] Refer to Figure 1 , a vertical main unit that is convenient for pressure testing and anti-backflow, including a single-volume manifold 4, an oil-gathering manifold 6, and a pipeline 17 from the main unit to the accident tank;

[0026] The single-volume manifold 4 is arranged in parallel with the oil-gathering manifold 6. Steel wedge gate valves 15 are provided at both ends of multiple pipelines 17 from the main unit to the accident tank and are respectively connected to the single-volume manifold 4 and the oil-gathering manifold 6. One end of the oil-gathering manifold 6 is connected to a heating type pig receiver 7, and the other end of the oil-gathering manifold 6 is connected to one end of a chemical injection pipeline 11. The other end of the chemical injection pipeline 11 is connected to a scale inhibitor chemical injection tank 10; the scale inhibitor chemical injection tank 10 and the oil-gathering manifold 6 are welded through the chemical injection pipeline 11, which is used for chemical injection of the liquid gathered by the main unit in the station to prevent scaling and corrosion of the gathering pipeline.

[0027] The pipeline 17 from the main control unit to the accident tank is connected to a swing check valve 16, and the swing check valve 16 is connected to a steel wedge gate valve 15 and the oil pipeline 12 from the well group; the oil pipeline 12 from the well group is connected to the steel wedge gate valve 15 by a flange. By opening and closing the steel wedge gate valve 15, the liquid coming from the well group can be connected or cut off from the station process, facilitating the process switching for scale removal or water pressure testing with clean water; the steel wedge gate valve 15 and the swing check valve 16 are connected by a flange, which is used to prevent the reverse flow of the oil from the oil pipeline 12 from the well group connected to the oil collecting manifold 6 of the main control unit due to the drop caused by pipeline leakage during the daily oil collection process.

[0028] The left end of the single - volume manifold 4 is connected to the pipeline 17 from the main control unit to the accident tank provided with a steel wedge gate valve 15, which is used for the emergency liquid inlet to the accident tank process. The right end of the single - volume manifold 4 is connected to a steel wedge gate valve 15, and a blow - through reserved head 5 of the main control unit is connected to the steel wedge gate valve 15; by closing the steel wedge gate valve 15 on the oil pipeline 12 connected to the single - volume manifold 4 and opening the steel wedge gate valve 15 connected to the pipeline 17 from the main control unit to the accident tank, and connecting the pipeline of the cement truck to the blow - through reserved head 5 of the main control unit, the single - volume manifold 4 can be descaled and purged. At the same time, flange covers 1 are provided at both ends of the single - volume manifold 4, which is convenient for cleaning.

[0029] The right end of the single - volume manifold 4 is connected to the pipeline 9 from the main control unit to the in - station single - volume meter provided with a steel wedge gate valve 15. The pipeline 9 from the main control unit to the in - station single - volume meter is connected to the single - volume manifold 4 by welding for single - volume measurement of the liquid volume. By closing the steel wedge gate valve 15 on the oil collecting manifold 6 and opening the steel wedge gate valve 15 on the pipeline 9 from the main control unit to the in - station single - volume meter, through process switching, the liquid coming from all well groups is introduced into the pipeline 9 from the main control unit to the in - station single - volume meter for single - volume measurement of the liquid volume of the liquid coming from the well groups.

[0030] One end of the oil collecting manifold 6 connected to the chemical - adding pipeline 11 is connected with a blow - through reserved head 13 of the oil collecting manifold. The oil collecting manifold 6 is connected to one side of the heated pig receiver 7 through a steel wedge gate valve 15, and the other side of the heated pig receiver 7 is connected to the pipeline 8 from the main control unit to the heating furnace provided with a steel wedge gate valve 15; a bypass pipeline is connected between the oil collecting manifold 6 and the pipeline 8 from the main control unit to the heating furnace, and a steel wedge gate valve 15 is provided on the bypass pipeline; during the in - station purging process, close all the steel wedge gate valves 15 on the oil pipelines 12 from the well groups and the oil collecting manifold 6, close the steel wedge gate valve 15 on the pipeline 9 from the main control unit to the in - station single - volume meter, open the steel wedge gate valve 15 on the single - volume manifold 4, open the steel wedge gate valve 15 connecting the single - volume manifold 4 and the pipeline 17 from the main control unit to the accident tank, connect the cement truck to the blow - through reserved head 13 of the oil collecting manifold, open the bypass of the heated pig receiver 7, and purge the pipeline 8 from the main control unit to the heating furnace and the in - station pipeline process.

[0031] The well group oil pipelines 12 are all connected with well group oil sampling ports 14, and the well group oil sampling ports 14 are connected to the well group oil pipelines 12 by welding, so as to take comprehensive samples of the well group oil and understand the changes in the water content of the well group crude oil.

[0032] The single-volume manifold 4 is also connected to an internally threaded gate valve 3, to which a pressure transmitter 2 is connected, and the pressure transmitter 2 is used to monitor the gathering and transportation pressure; flange covers 1 are provided at both ends of the single-volume manifold 4 to facilitate the cleaning of the pipeline, and a pressure transmitter 2 is provided on each well group oil pipeline 12, and the oil gathering manifolds 6 on both sides of the heated ball collecting barrel 7 and the main machine to the heating furnace pipeline 8 are provided with pressure transmitters 2 for transmitting pressure data to the station control system in real time, and the swing check valve 16 is connected to the single-volume manifold 4 and the oil gathering manifold 6 through a three-way pipeline, and is used to switch the process for gathering and transportation or single-volume well group liquid volume.

[0033] When the cement truck is connected to the well site for the clean water pressure test of the oil pipeline, the steel wedge gate valve 15 connected to the well group oil pipeline 12 is closed, the steel wedge gate valve 15 connected to the single volume manifold 4 is closed, the steel wedge gate valve 15 connected to the flange of the oil gathering manifold 6 is closed, the swing check valve 16 is removed, and a blind plate is installed on the steel wedge gate valve 15 for cleaning the corresponding pipeline, so as to reduce the amount of oil and gas in the total mechanism process when removing the three-way pressure relief.

[0034] When the cement truck is connected to the well site to clean the oil pipeline, the steel wedge gate valve 15 connected to the oil pipeline 12 of the well group is closed, the steel wedge gate valve 15 connected to the single volume manifold 4 is closed, the steel wedge gate valve 15 connected to the flange of the oil collecting manifold 6 is closed, and the swing check valve 16 is removed to reduce the oil and gas spillage during the removal of the three-way pressure relief in the main flow. The steel wedge gate valve 15 for cleaning the corresponding pipeline is connected to the tank truck through the union. During the operation, the steel wedge gate valve 15 is opened to let the scale brought by the cleaning ball in the oil pipeline enter the tank truck.

[0035] The utility model provides a vertical main valve which is convenient for pressure testing and backflow prevention. When switching the process of descaling and clean water pressure testing operations, it is only necessary to close the corresponding steel wedge gate valve 15 and disassemble the swing check valve 16, which can prevent backflow leakage caused by pressure drop due to pipeline damage, and can also reduce pressure relief in the oil collection pipeline, so that the workload of clean water pressure testing or pipeline descaling operations is reduced, the environmental protection risk is reduced, and the operation efficiency is greatly improved.

[0036] The above description is only a preferred embodiment of the prior art type of fixing and installation of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A vertical main switch for pressure testing and backflow prevention, characterized in that: It includes a single volume manifold (4), an oil collecting manifold (6) and a main machine to accident tank pipeline (17); The single-volume manifold (4) is arranged in parallel with the oil collecting manifold (6), and steel wedge-type gate valves (15) are arranged at both ends of the plurality of main engine to accident tank pipelines (17) and are respectively connected to the single-volume manifold (4) and the oil collecting manifold (6), one end of the oil collecting manifold (6) is connected to the heated ball collecting bucket (7), and the other end of the oil collecting manifold (6) is connected to one end of the dosing pipeline (11), and the other end of the dosing pipeline (11) is connected to the scale inhibitor dosing tank (10); The main engine to the accident tank pipeline (17) is connected to a swing check valve (16), and the swing check valve (16) is connected to a steel wedge gate valve (15) and connected to the well group oil pipeline (12).

2. A vertical main switch for pressure testing and backflow prevention according to claim 1, characterized in that: The left end of the single-volume manifold (4) is connected to a steel wedge-type gate valve (15), and the steel wedge-type gate valve (15) is connected to a main engine to an accident tank pipeline (17); the right end of the single-volume manifold (4) is connected to a steel wedge-type gate valve (15), and the steel wedge-type gate valve (15) is connected to a main engine purge reserved head (5).

3. A vertical main switch for pressure testing and backflow prevention according to claim 2, characterized in that: The right end of the single-volume manifold (4) is connected to a main engine equipped with a steel wedge-type gate valve (15) to a single-volume meter pipeline (9) in the station.

4. A vertical main switch for pressure testing and backflow prevention according to claim 1, characterized in that: One end of the oil collecting manifold (6) connected to the dosing pipeline (11) is connected to an oil collecting manifold purge reserve head (13).

5. A vertical main switch for pressure testing and backflow prevention according to claim 1, characterized in that: The well group oil supply pipelines (12) are all connected to well group oil supply sampling ports (14).

6. A vertical main switch for pressure testing and backflow prevention according to claim 1, characterized in that: The single-volume manifold (4) is also connected to an internally threaded gate valve (3), and the internally threaded gate valve (3) is connected to a pressure transmitter (2).

7. A vertical main switch for pressure testing and backflow prevention according to claim 1, characterized in that: The oil collecting manifold (6) is connected to one side of the heating ball collecting bucket (7) through a steel wedge gate valve (15), and the other side of the heating ball collecting bucket (7) is connected to a main pipe to the heating furnace pipeline (8) provided with a steel wedge gate valve (15); a bypass pipeline is connected between the oil collecting manifold (6) and the main pipe to the heating furnace pipeline (8), and a steel wedge gate valve (15) is provided on the bypass pipeline.

8. A vertical main switch for pressure testing and backflow prevention according to claim 1, characterized in that: Flange covers (1) are provided at both ends of the single-volume manifold (4).

9. A vertical main switch for pressure testing and backflow prevention according to claim 1 or 7, characterized in that: Each well group oil pipeline (12) is provided with a pressure transmitter (2), and the oil collecting manifolds (6) on both sides of the heating ball receiving barrel (7) and the pipeline (8) from the main engine to the heating furnace are also provided with pressure transmitters (2).

10. A vertical main switch for pressure testing and backflow prevention according to claim 1, characterized in that: The swing check valve (16) is connected to the single volume manifold (4) and the oil collecting manifold (6) via a three-way pipeline.

Images