Thin oil recycling system
By designing a thin oil recovery and reuse system, the problems of thin oil waste and pipeline corrosion in the oil well mining of ultra-heavy oil blocks have been solved, efficient recycling and reuse of thin oil have been achieved, and the service life of the pipeline has been extended.
Patent Information
- Application Number
- CN202421732164.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-22
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2034-07-22
AI Technical Summary
During the oil well mining process of the ultra-heavy oil block, thin oil resources are seriously wasted, and the single-well pipeline brine sweep leads to pipeline corrosion.
A thin oil recovery and reuse system is designed, including a transfer station with a thin oil storage tank. Through a single well inlet metering valve group, a thin oil heating furnace and a thin oil doped pump, the thin oil recovery and reuse of thin oil is realized, and the brine sweeps are avoided.
Effectively recover and reuse of thin oil resources, reduce pipeline corrosion, extend the service life of the pipeline, and save thin oil resources.
Smart Images
Figure CN222821489U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of heavy oil exploitation, in particular to a thin oil recovery and reuse system. Background Art
[0002] For the super-heavy oil blocks in the oil field, such as the 12th block of Tahe Oilfield, the average viscosity is 1.0045mps, which makes it extremely difficult to mine. At present, after years of exploration, Sinopec Northwest Oilfield Branch has formed a set of relatively mature comprehensive technologies for blending thin oil to reduce viscosity and mine super-heavy oil. However, the shortage of thin oil has brought great constraints to this thin production. In order to meet the normal production of oil wells, the oil pipes and casings of the oil wells need to be filled with thin oil before and after the wells are opened, and thin oil must be continuously added to the wells during the well opening process to ensure normal production. However, the thin oil in the oil pipes and ground pipelines cannot be recovered and directly enters the production system. It is transported to the joint station as mixed oil and sold, wasting a lot of thin oil as a scarce resource. In addition, after the single-well production pipeline is shut down, the single-well pipeline needs to be swept with brine and pump trucks to replace the mixed oil in the single-well pipeline to prevent the pipeline from condensing during the pipeline shutdown, but the brine will cause corrosion to the pipeline. Utility Model Content
[0003] In order to solve the problems of waste of thin oil when viscosifying super-heavy oil by blending thin oil, and pipeline corrosion caused by brine sweeping of single well pipeline, the utility model provides a thin oil recovery and reuse system.
[0004] The technical solution of the utility model is as follows:
[0005] A thin oil recovery and reuse system, characterized in that it includes a metering station with a thin oil storage tank, the metering station includes a single-well inlet metering valve group, the metering manifold outlet is connected to the thin oil heating furnace through a thin oil pipeline from a single well outside the station, the thin oil pipeline from outside the station merges into the thin oil pipeline from the single well outside the station before the inlet of the thin oil heating furnace, the outlet of the thin oil heating furnace is connected to the thin oil storage tank through a heating furnace and thin oil storage tank connecting pipeline, and the thin oil storage tank is connected to the dilution pump through a thin oil storage tank and dilution pump connecting pipeline.
[0006] Preferably, a high-pressure automatic flow meter is provided before the off-station thin oil pipeline merges into the off-station single-well thin oil pipeline.
[0007] Further preferably, the high-pressure automatic flow meter has valves on both sides.
[0008] Further preferably, the high-pressure automatic flowmeter is connected in parallel with a flowmeter bypass.
[0009] Further preferably, a valve is provided on the flow meter bypass pipeline.
[0010] Further preferably, a valve is provided between the confluence inlet of the thin oil pipeline outside the station and the thin oil pipeline from the single well outside the station and the high-pressure automatic flowmeter.
[0011] Preferably, a valve is provided between the confluence of the thin oil pipeline outside the station and the thin oil pipeline from the single well outside the station and the thin oil heating furnace.
[0012] Beneficial technical effects of the utility model:
[0013] The utility model aims at a metering and transfer station with a thin oil storage tank, and changes the outlet direction of the metering manifold in the station. The thin oil flowing in the thin oil inlet from a single well and the thin oil inlet pipeline outside the station are both thin oil, one is the thin oil coming from the wellhead of the single well, and the other is the thin oil coming from the thin oil pipeline network. Finally, through the connecting pipeline, the thin oil coming from the single well and the thin oil coming from the station are gathered together and enter the heating furnace in the station and then enter the thin oil storage tank in the station, so that the process flow of the metering manifold is connected with the process flow of the thin oil inlet in the station, and a metering device is installed before the thin oil inlet pipelines meet, so as to achieve the purpose of entering the thin oil supply process system after the single well output is metered.
[0014] Before the use of the utility model, after the single-well production pipeline is shut down, it is necessary to use brine and a pump truck to sweep the single-well pipeline to replace the mixed oil in the single-well pipeline to prevent the pipeline from condensing during the pipeline shutdown. After the use of this patent, the station dilution pump pressurizes the thin oil in the station and passes through the single-well dilution pipeline to the wellhead of the single well, and then the thin oil enters the production pipeline, and the mixed oil in the production pipeline is replaced with thin oil, so there is no need for brine and pump truck sweeping. When the well is opened next time, the single-well mixed oil pushes the thin oil in the production pipeline from the wellhead to the metering valve group in the station, but then arrives at the thin oil storage tank in the station, forming a thin oil recovery purpose. When the single-well mixed oil is seen from the station inlet valve group, it enters the production valve group through the cutting and modification process, that is, the thin oil recovery and reuse is realized, and the construction of pump trucks and brine sweeping is avoided. Since thin oil can replace brine for single well pipeline sweeping, the pipeline corrosion rate drops from 1.142mm / a to 0.135mm / a, which can extend the service life of the pipeline, significantly reduce the number of pipeline corrosion perforations, and reduce the legal risks of environmental pollution in oil production plants and branches; at the same time, the thin oil recovery process can not only recover the thin oil used for single well production pipeline sweeping, but also recover the thin oil in the tubing (when shutting down a well with heavy oil mixed with dilution to reduce viscosity, it is necessary to inject thin oil to treat the tubing to prevent the tubing from condensing) and the thin oil in part of the annulus (casing). Not only does the sweeping thin oil not get wasted, but it also saves the tubing and part of the annulus thin oil, effectively saving thin oil resources and increasing the reuse rate of thin oil. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 The figure is a schematic diagram of a system for recovering and reusing thin oil according to an embodiment of the present invention.
[0016] The reference numbers in the figure are listed as follows:
[0017] 1- Single well inlet metering valve group; 2- Thin oil pipeline from single well outside the station; 3- High-pressure automatic flowmeter; 4- Flowmeter bypass; 5- Thin oil heating furnace; 6- Pipeline connecting heating furnace and thin oil storage tank; 7- Thin oil storage tank; 8- Pipeline connecting thin oil storage tank and thinning pump; 9- Thin oil pipeline outside the station. DETAILED DESCRIPTION
[0018] The present invention will be described in further detail below with reference to the accompanying drawings. The following represents a preferred embodiment of the present invention, and it should be understood that those skilled in the art can modify the present invention described herein and still achieve the beneficial effects of the present invention. Therefore, the following description should be understood as being widely known to those skilled in the art, and not as a limitation to the present invention.
[0019] Example 1
[0020] like Figure 1 A thin oil recovery and reuse system shown in the figure includes a metering station with a thin oil storage tank 7, the metering station includes a single-well inlet metering valve group 1, the metering manifold outlet is connected to the thin oil heating furnace 5 through a thin oil pipeline 2 from a single well outside the station, and a thin oil pipeline 9 from outside the station merges into the thin oil pipeline 2 from a single well outside the station before the inlet of the thin oil heating furnace 5. The outlet of the thin oil heating furnace 5 is connected to the thin oil storage tank 7 through a heating furnace and thin oil tank connecting pipeline 6, and the thin oil storage tank 7 is connected to the thinning pump through a thin oil storage tank and thinning pump connecting pipeline 8.
[0021] A high-pressure automatic flowmeter 3 is arranged before the off-station thin oil pipeline 9 merges into the off-station single-well thin oil pipeline 2. The high-pressure automatic flowmeter 3 is connected in parallel with a flowmeter bypass 4, which is used as a bypass pipeline for maintenance of the flowmeter.
[0022] Furthermore, valves are provided on both sides of the high-pressure automatic flowmeter and on the pipeline bypassing the flowmeter; valves are provided between the confluence of the off-station thin oil pipeline and the off-station single-well thin oil pipeline and the high-pressure automatic flowmeter, as well as between the thin oil heating furnace.
[0023] In this embodiment, after a single well is shut down, the wellhead process is reversed to connect the wellhead dilution pipeline with the production pipeline, and the single well pipeline is replaced with a thin oil sweep line through the dilution pipeline using the high-pressure dilution system in the metering transfer station. For metering transfer stations with thin oil storage tanks, the first half of the process flow of the metering system in the station is connected in parallel with the second half of the process flow of the thin oil supply system, so as to achieve the effect of recovering the thin oil in the single well pipeline into the thin oil storage tank. Not only can the thin oil of pipeline sweeping be recovered, but also the thin oil of the oil pipe in the wellbore and part of the thin oil in the annulus of the oil well can be recovered, which effectively saves thin oil resources and improves the utilization efficiency of thin oil. Greatly reduces the number of pipeline corrosion perforations;
[0024] The system of this embodiment has been promoted and tried in 25 metering stations, and has recovered 8,393 wells of thin oil, with a total of 335,756 tons of thin oil. After application, there has been no corrosion perforation in the thin oil sweeping pipeline. After the thin oil recovery and reuse process is completed, the operating cost is zero, and only a small amount of work is added to the post personnel. The economic benefit can reach 81.2 million yuan after calculation.
[0025] The above shows and describes the basic principles, main features and advantages of the utility model, so the above is only an embodiment of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and the description only describe the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model also includes various equivalent changes and improvements, which will fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.
Claims
1. A system for recycling and reusing thin oil, characterized in that It comprises a metering station with a thin oil storage tank, the metering station comprises a single-well inlet metering valve group, the metering manifold outlet is connected to the thin oil heating furnace via a thin oil pipeline from a single well outside the station, the thin oil pipeline from outside the station merges into the thin oil pipeline from the single well outside the station before the inlet of the thin oil heating furnace, the outlet of the thin oil heating furnace is connected to the thin oil storage tank via a connecting pipeline between the heating furnace and the thin oil storage tank, and the thin oil storage tank is connected to the thinning pump via a connecting pipeline between the thin oil storage tank and the thinning pump.
2. A system for recycling and reusing thin oil according to claim 1, characterized in that A high-pressure automatic flow meter is arranged before the thin oil pipeline outside the station merges into the thin oil pipeline from the single well outside the station.
3. A system for recycling and reusing thin oil according to claim 2, characterized in that The high-pressure automatic flow meter is provided with valves on both sides.
4. The system for recycling and recovering thin oil according to claim 2 is characterized in that The high-pressure automatic flow meter is connected in parallel with a flow meter bypass.
5. A system for recycling and reusing thin oil according to claim 4, characterized in that A valve is provided on the pipeline bypassing the flow meter.
6. The system for recycling and recovering thin oil according to claim 2, characterized in that A valve is provided between the confluence inlet of the thin oil pipeline outside the station and the thin oil pipeline from the single well outside the station and the high-pressure automatic flowmeter.
7. The system for recovering and reusing thin oil according to claim 1, characterized in that A valve is arranged between the confluence of the thin oil pipeline outside the station and the thin oil pipeline from the single well outside the station and the thin oil heating furnace.