Oil field gas injection boiler steam dryness online detection system

Abstract

The invention relates to the technical field of steam dryness online detection, in particular to an oil field gas injection boiler steam dryness online detection system. The oil field gas injection boiler steam dryness online detection system comprises a boiler water sampling pipe, a cooler boiler water inlet electric control valve, a boiler water manual sampling valve, a cooler, a cooler boiler water outlet pipeline, a boiler water cylinder, a boiler water conductivity sensor, a boiler water cylinder liquid level sensor, a boiler water cylinder emptying electric control valve, a boiler water cylinder overflow pipe and a cooler cooling water inlet electric control valve. The device comprises a cooler cooling water outlet pipeline, a raw water sampling pipe, a raw water inlet electric control valve, a raw water manual sampling valve, a raw water detection cylinder, a raw water conductivity sensor, a raw water cylinder liquid level sensor, a raw water cylinder emptying electric valve, a raw water cylinder overflow pipe and a pollution discharge manifold. The technical connection adopts clamping sleeve quick connection, is convenient to disassemble, assemble and maintain, and is convenient to replace and maintain due to modular design of equipment.

Description

Technical Field

[0001] The invention relates to the technical field of steam quality online detection, and in particular to an oilfield gas injection boiler steam quality online detection system. Background Art

[0002] At present, in the process of heavy oil and super-heavy oil exploitation, oil fields generally adopt the method of injecting high-temperature and high-pressure steam into the oil layer to displace crude oil. The steam used is produced by a gas injection boiler. At the same time, there are strict dryness requirements for steam before it is injected into the oil layer, and the steam dryness must be tested regularly. At present, the commonly used online detection methods include: conductivity method and double vortex street method; the conductivity method uses a conductivity sensor as an electrode to detect the conductivity of boiler water and feed water. Because the conductivity of water is proportional to the salt content in the water, that is, dryness = (boiler water salt content-raw water salt content) / boiler water salt content = (boiler water conductivity-raw water conductivity) / boiler water conductivity. This method is simple in principle, the equipment is cheap, and combined with a reasonable detection process, it can realize online real-time monitoring of steam dryness, and its accuracy can reach 2% to 3%; the invention content of this patent is a detection process for this detection method.

[0003] The current online steam dryness devices or products in use have not achieved satisfactory results during application, and most online dryness measurement devices have been abandoned. Through analysis, we found that the online real-time measurement of dryness has not been effective, mainly because the measurement process is unreasonable and cannot meet the actual application conditions.

[0004] The water used in the gas injection boiler of the oil field is basically the wastewater separated from the crude oil, which has a high hardness. After being heated to a very high temperature, the boiler water separated by the steam-water separator is very easy to scale. At present, the online detection process generally adopts the form of soaking the conductivity probe in the liquid for a long time, which soon scales and fails; in addition, the design of the measuring cylinder is unreasonable, and the reasonable distance of the conductivity sensor cylinder wall is not guaranteed, resulting in inaccurate measurement results; the process layout is poor, and the process pipeline is easy to scale and clog, and the data cannot be accurately measured within the timing of the automatic control program; although the above products have no problems in principle, due to the above reasons, the online detection device will soon fail and be abandoned. Therefore, it is very necessary to study and explore a set of online dryness detection device processes with a reasonable layout and a long maintenance cycle. Summary of the invention

[0005] The purpose of the present invention is to solve the above-mentioned shortcomings in the prior art and to propose an online detection system for steam quality of an oilfield gas injection boiler.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] An online detection system for steam dryness of an oilfield gas injection boiler is designed. The online detection system for steam dryness of an oilfield gas injection boiler includes a boiler water sampling tube, a cooler boiler water inlet electric control valve, a boiler water manual sampling valve, a cooler, a cooler boiler water outlet pipeline, a boiler water cylinder, a boiler water conductivity sensor, a boiler water cylinder level sensor, a boiler water cylinder emptying electric control valve, a boiler water cylinder overflow pipe, a cooler cooling water inlet electric control valve, a cooler cooling water outlet pipeline, a raw water sampling tube, a raw water inlet electric control valve, a raw water manual sampling valve, a raw water detection cylinder, a raw water conductivity sensor, a raw water cylinder level sensor, a raw water cylinder emptying electric valve, a raw water cylinder overflow pipe, and a sewage manifold.

[0008] In detail, a boiler water tank liquid level sensor is arranged on the boiler water tank.

[0009] In detail, a boiler water conductivity detection sensor is also arranged on the boiler water cylinder.

[0010] In detail, the distance between the head of the boiler water conductivity sensor and the boiler water cylinder wall in all directions of up, down, left and right is not less than 50 mm.

[0011] In detail, a boiler water overflow pipe is arranged on the top of the boiler water cylinder.

[0012] In detail, a manual sampling valve is arranged upstream of the electric control valve of the cooler boiler water inlet.

[0013] In detail, a raw water tank liquid level sensor is provided on the raw water tank.

[0014] In detail, a raw water conductivity detection sensor is provided on the raw water tank.

[0015] In detail, the distance between the head of the raw water conductivity sensor and the wall of the raw water tank is no less than 50 mm in all directions of up, down, left and right.

[0016] The design scheme proposed by the present invention has the following beneficial effects during application:

[0017] 1. It can ensure accurate test results, long service life, long maintenance cycle, and save manpower and material resources;

[0018] 2. The process connection adopts ferrule quick connection, which is convenient for disassembly and maintenance. The modular design of the equipment is convenient for replacement and maintenance. The liquid in the detection cylinder is emptied after detection to keep the surface of the conductivity sensor dry, which can effectively extend the maintenance cycle and service life of the conductivity sensor. The overall process is reasonable. Combined with the self-control function of the automatic control system, this process can meet the use environment of long-term online detection and avoid the drawbacks of existing detection process methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1It is a schematic diagram of the implementation process of the present invention.

[0020] Among them: 1. Raw water tank level sensor; 11. Raw water emptying electric control valve; 2. Raw water tank overflow pipe; 3. Raw water tank; 4. Raw water inlet electric control valve; 5. Raw water manual sampling valve; 6. Raw water sampling tube;

[0021] 7. Cooling water inlet electric control valve of cooler; 8. Boiler water sampling tube; 9. Boiler water manual sampling valve; 10. Cooler boiler water inlet electric control valve; 11. Boiler water cooler; 12. Coil; 13. Cooling outlet pipeline of cooler;

[0022] 14. Boiler water inlet pipeline; 15. Boiler water detection cylinder; 16. Boiler water overflow pipe; 17. Boiler water cylinder level sensor; 18. Boiler water conductivity sensor; 19. Boiler water drain electric control valve; 20. Sewage pipe. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0024] Reference Figure 1 The invention discloses an online detection system for steam dryness of an oilfield gas injection boiler. The online detection system for steam dryness of an oilfield gas injection boiler comprises a boiler water sampling tube, a cooler boiler water inlet electric control valve, a boiler water manual sampling valve, a cooler, a cooler boiler water outlet pipeline, a boiler water cylinder, a boiler water conductivity sensor, a boiler water cylinder liquid level sensor, a boiler water cylinder emptying electric control valve, a boiler water cylinder overflow pipe, a cooler cooling water inlet electric control valve, a cooler cooling water outlet pipeline, a raw water sampling tube, a raw water inlet electric control valve, a raw water manual sampling valve, a raw water detection cylinder, a raw water conductivity sensor, a raw water cylinder liquid level sensor, a raw water cylinder emptying electric valve, a raw water cylinder overflow pipe and a sewage manifold.

[0025] The dryness detection process equipment is mainly composed of pipelines, electric control valves, boiler water coolers, boiler water tanks, and raw water tanks.

[0026] Furthermore, a boiler water tank liquid level sensor is arranged on the boiler water tank to control the boiler water level height in the boiler water tank.

[0027] Furthermore, a boiler water conductivity detection sensor is provided on the boiler water cylinder to detect the conductivity of the raw water. The distance between the head of the conductivity sensor and the boiler water cylinder wall in all directions of up, down, left and right is greater than 50 mm, which can effectively avoid interference.

[0028] When testing is required, the cooling water inlet electric control valve of the cooler automatically opens, and the cooling water (raw water) flows into the cooler from the bottom side of the cooler, flows out of the cooler from the top side of the cooler, and flows into the sewage manifold through the cooling water outlet pipeline of the cooler. The cooling water keeps flowing during the boiler water testing cycle. After the boiler water testing cycle ends, the cooling water inlet electric control valve of the cooler automatically closes

[0029] Further open the cooler boiler water inlet electric control valve, the boiler water flows into the cooler internal coil through the boiler water sampling tube, and then enters the boiler water cylinder through the boiler water inlet pipeline. When the liquid level in the boiler water cylinder reaches the set height, the cooler boiler water inlet electric control valve automatically closes.

[0030] A further boiler water conductivity sensor automatically starts detecting the conductivity of the boiler water.

[0031] After further measurement of boiler water conductivity is completed, the boiler water drain electric control valve automatically opens, and the boiler water in the boiler water cylinder is drained to the drain manifold, and automatically closes after draining. The benefit of draining the boiler water in the cylinder after detection is that it can prevent scaling on the surface of the boiler water conductivity sensor, which will affect the detection accuracy in the long run.

[0032] Furthermore, a boiler water overflow pipe is arranged on the top of the boiler water cylinder. When the liquid level is out of control, the boiler water can overflow to the sewage manifold through the overflow pipe, thereby preventing the boiler water cylinder from being subjected to high pressure.

[0033] Furthermore, a manual sampling valve is provided on the sampling pipe upstream of the electric control valve of the cooler boiler water inlet, so that a manual temporary detection method can be adopted in real time when the automatic detection fails.

[0034] A raw water tank liquid level sensor is provided on the raw water tank to control the liquid level height.

[0035] Furthermore, a raw water conductivity detection sensor is provided on the raw water tank to detect the raw water conductivity. The distance between the head of the conductivity sensor and the wall of the raw water tank in all directions of up, down, left and right is greater than 50 mm.

[0036] When the raw water test is further started, the raw water inlet electric control valve automatically opens, and the raw water flows into the raw water tank through the raw water sampling tube. When the liquid level reaches the detection height, the raw water tank liquid level sensor controls the raw water inlet electric control valve to automatically close.

[0037] The raw water conductivity sensor starts to detect further. After the detection is completed, the raw water drain electric valve opens automatically to drain the raw water in the raw water tank. The benefit of draining the raw water in the tank after the detection is that it can prevent scaling on the surface of the boiler water conductivity sensor, which will affect the detection accuracy in the long run.

[0038] The steam dryness is further automatically calculated using the dryness calculation formula [dryness = (boiler water conductivity - raw water conductivity) / boiler water conductivity].

[0039] The process connection adopts the fast connection of the ferrule, which is convenient for disassembly and maintenance. The modular design of the equipment is convenient for replacement and maintenance.

[0040] By draining the liquid in the test cylinder after testing and keeping the surface of the conductivity sensor dry, the maintenance cycle and service life of the conductivity sensor can be effectively extended.

[0041] The overall process is reasonable, and combined with the self-control function of the automatic control system, the process can meet the use environment of long-term online detection and avoid the drawbacks of existing detection process methods.

[0042] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An online detection system for steam quality of oilfield gas injection boiler, characterized in that: The online detection system for steam dryness of oilfield gas injection boiler includes boiler water sampling tube, cooler boiler water inlet electric control valve, boiler water manual sampling valve, cooler, cooler boiler water outlet pipeline, boiler water cylinder, boiler water conductivity sensor, boiler water cylinder level sensor, boiler water cylinder emptying electric control valve, boiler water cylinder overflow pipe, cooler cooling water inlet electric control valve, cooler cooling water outlet pipeline, raw water sampling tube, raw water inlet electric control valve, raw water manual sampling valve, raw water detection cylinder, raw water conductivity sensor, raw water cylinder level sensor, raw water cylinder emptying electric valve, raw water cylinder overflow pipe, and sewage manifold.

2. The online detection system for steam quality of an oilfield gas injection boiler according to claim 1 is characterized by: A furnace water tank liquid level sensor is arranged on the furnace water tank.

3. The online detection system for steam quality of an oilfield gas injection boiler according to claim 1 is characterized by: The boiler water cylinder is also provided with a boiler water conductivity detection sensor.

4. The online detection system for steam quality of an oilfield gas injection boiler according to claim 1 is characterized in that: The distance between the head of the boiler water conductivity sensor and the boiler water cylinder wall in all directions of up, down, left, and right is no less than 50 mm.

5. The online detection system for steam quality of oilfield gas injection boiler according to claim 1 is characterized by: A boiler water overflow pipe is arranged on the top of the boiler water cylinder.

6. The online detection system for steam quality of oilfield gas injection boiler according to claim 1 is characterized by: A manual sampling valve is arranged upstream of the electric control valve for the cooler boiler water inlet.

7. The online detection system for steam quality of oilfield gas injection boiler according to claim 1 is characterized by: The raw water tank is provided with a raw water tank liquid level sensor.

8. The online detection system for steam quality of an oilfield gas injection boiler according to claim 1 is characterized by: The raw water tank is provided with a raw water conductivity detection sensor.

9. The online detection system for steam quality of oilfield gas injection boiler according to claim 1, characterized in that: The distance between the head of the raw water conductivity sensor and the wall of the raw water tank is no less than 50 mm in all directions of up, down, left, and right.

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