Device and method for separating condensate oil containing floccules

Abstract

The invention relates to the technical field of separation of floccule-containing gas condensate, in particular to a floccule-containing gas condensate separation device which comprises a settling tank, a prying type device, a waste liquid tank, a gas condensate tank and a control system, the prying type device comprises a device shell, a centrifugal flow pump, a densimeter, an L-shaped electronic three-way ball valve and a centrifugal machine, wherein the centrifugal flow pump, the densimeter, the L-shaped electronic three-way ball valve and the centrifugal machine are arranged on the device shell. The pumping-in end of the centrifugal flow pump is communicated with the settling tank, the pumping-out end of the centrifugal flow pump is communicated with one end of the densimeter, and three ports of the L-shaped electronic three-way ball valve are connected with the liquid outlet end of the densimeter, the waste liquid tank and a centrifugal machine inlet of the centrifugal machine through pipelines respectively; a pipeline E is communicated between the heavy liquid port of the centrifugal machine and the waste liquid tank, an electromagnetic valve is arranged on the pipeline E, and an oil discharge pipe is communicated between the light liquid port of the centrifugal machine and the condensate oil tank; and the densitometer, the L-shaped electronic three-way ball valve and the electromagnetic valve are all electrically connected with the control system. According to the invention, the condensate oil containing floccules can be conveniently and effectively separated.

Description

Technical Field

[0001] The present invention relates to the technical field of separation of condensate oil containing floccules, and in particular to a device and method for separating condensate oil containing floccules. Background Art

[0002] Natural gas fields can produce high-quality liquid condensate oil by extracting natural gas from underground high-temperature and high-pressure environments and condensing it on the ground. Its main components are a mixture of C4-C10 hydrocarbons, and contain other components such as water and sulfides. In actual production, it is found that the front-end natural gas extraction and related impurity removal processes cause floccules to be produced in the back-end sedimentation tank. The floccules are gray or brown, insoluble in oil and water, and have a density between oil and water.

[0003] At present, workers on site use transparent pipes to connect to the bottom interface of the sedimentation tank, so that the mixed liquid in the tank is discharged in the order of water, flocculent layer, and oil. By observing the color of the fluid in the pipe, the water and flocculent layer are manually judged to be discharged into the waste liquid tank. When light yellow condensate begins to appear in the pipe, it is discharged to the condensate tank for storage. However, this simple separation method still contains floccules in the condensate tank, which does not meet the treatment requirements. The quality of the condensate cannot be guaranteed by workers relying on color judgment. Some oil fields use chemical methods to treat suspended matter in the oil-water intermediate layer, and suppress or destroy the formation of suspended matter by adding demulsifiers, flocculants, etc. However, this method requires precise control of the amount of additives, which is difficult and troublesome to handle, and may not be applicable to the existing technology of the gas field.

[0004] In summary, some natural gas fields currently require a simple and efficient device for floc separation during condensate oil production, and it is urgent to design a condensate oil separation device and method containing flocs. Summary of the invention

[0005] The object of the present invention is to provide a condensate oil separation device containing floccules, aiming to improve the problem in the prior art that it is inconvenient to effectively separate condensate oil during condensate oil production in natural gas oil fields.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A flocculent condensate separation device comprises a settling tank, a skid device, a waste liquid tank, a condensate tank and a control system;

[0008] The pry-type device comprises a device housing and a centrifugal flow pump, a density meter, an L-shaped electronic three-way ball valve and a centrifuge arranged on the device housing;

[0009] The pump inlet end of the centrifugal flow pump is connected to the bottom of the sedimentation tank, and the pump outlet end is connected to one end of the density meter. The three ports of the L-type electronic three-way ball valve are respectively connected to the liquid outlet end of the density meter, the waste liquid tank, and the centrifuge inlet of the centrifuge through pipelines; and a pipeline E is connected between the heavy liquid port of the centrifuge and the waste liquid tank, and a solenoid valve is provided on the pipeline E. The light liquid port of the centrifuge is connected to the condensate oil tank through an oil drain pipe; the density meter, the L-type electronic three-way ball valve and the solenoid valve are all electrically connected to the control system.

[0010] Furthermore, the centrifuge is a disc centrifuge, a tubular centrifuge or a horizontal screw centrifuge.

[0011] Furthermore, it also includes a filter device, which includes an upper shell, a filter cylinder, a lower shell and a base; the lower shell is arranged on the base, the upper shell is detachably arranged above the lower shell, the filter cylinder is located inside the lower shell, the upper shell is provided with a filter device inlet, the upper end of the filter cylinder is connected to the filter device inlet, and the lower shell is connected to the filter device outlet;

[0012] The centrifuge inlet of the centrifuge is connected to the L-type electronic three-way ball valve through a pipeline A, a pipeline B is connected between the inlet of the filter device and the pipeline A, and a solenoid valve is arranged on the pipeline B. The solenoid valve is arranged on the pipe section of the pipeline A along the internal liquid flow direction and crossing the pipeline B; the outlet of the filter device is connected to the oil drain pipe through a pipeline D, and a solenoid valve is arranged on the pipeline D.

[0013] Furthermore, a pipeline C is connected between the centrifuge inlet and pipeline B, a solenoid valve is provided on the pipeline C, the solenoid valve on the pipeline B is located between pipeline A and pipeline C, and a solenoid valve is also provided on the oil discharge pipe section between the centrifuge inlet and pipeline D.

[0014] Furthermore, the filter cylinder is made of stainless steel, non-woven fabric, synthetic fiber or activated carbon.

[0015] Furthermore, the filter cylinder has a mesh size of 600 to 2800.

[0016] The present invention also provides a method for separating condensate oil containing floccules, which is applied to the above-mentioned condensate oil separation device containing floccules, and comprises the following steps:

[0017] S1. The liquid to be treated containing water, flocs and condensate oil is placed in a settling tank for preliminary gravity settling. The settling tank contains condensate oil, flocs and water from top to bottom.

[0018] Preset a density ratio data of the liquid to be treated and the condensate oil, wherein the density ratio data is greater than 1 and less than 1.1;

[0019] S2, transporting the liquid at the bottom of the liquid to be treated to the inside of the skid-type device through a centrifugal flow pump;

[0020] S3, detecting the real-time density of the passing fluid by means of a densitometer;

[0021] S4, calculating in real time the ratio of the real-time density of the fluid to the density of the condensate oil through the control system;

[0022] S5. If the ratio is greater than the preset density ratio data, the L-type electronic three-way ball valve is connected to the pipeline between the waste liquid tank, and the fluid is discharged into the waste liquid tank for storage;

[0023] If the ratio is less than or equal to the preset density ratio data, the L-type electronic three-way ball valve is connected to the pipeline between pipeline A, and the fluid flows into the centrifuge and / or the filter device for floc separation. The fluid after floc separation flows into the condensate oil tank for storage.

[0024] Further, in step S1, the density ratio data is 1.05.

[0025] Further, in step S5,

[0026] If the solenoid valves on pipelines B, C and D are closed, and the solenoid valves on pipelines A, E and the oil drain pipe are opened, the liquid to be treated flows into the centrifuge for separation treatment, the water and flocs in the liquid to be treated are discharged to the waste liquid tank through pipeline E for storage, and the condensate oil flows into the condensate oil tank through the oil drain pipe for storage.

[0027] Furthermore, in step S5, if the solenoid valves on pipeline B and the oil drain pipe are closed, and the solenoid valves on pipeline A, pipeline C, and pipeline D are opened, the liquid to be treated is first separated by the centrifuge, and the condensate oil after separation enters the filtering device for filtering, and the condensate oil after filtering is finally stored in the condensate oil tank;

[0028] If the solenoid valve on pipeline C is closed, and the solenoid valves on pipelines A, B, D and the oil drain pipe are opened, part of the liquid to be treated enters the centrifuge for separation treatment, and the other part enters the filter device for filtration treatment;

[0029] If the solenoid valves on pipeline A, pipeline C and the oil drain pipe are closed and the solenoid valve on pipeline B is opened, all the liquid to be treated will enter the filtering device for filtering treatment.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. The present invention provides a floc-containing condensate oil separation device and method, which provides two floc separation schemes, namely a centrifuge and a filter device, and can realize intelligent, efficient, high-quality multi-scheme separation of flocs in the condensate oil production process to obtain high-quality condensate oil;

[0032] 2. The device adopts a skid-mounted structure, which is easy to install, use and maintain, and can better meet the on-site use requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0034] Figure 1 It is a structural schematic diagram of the present invention;

[0035] Figure 2 It is a schematic diagram of the structure of the filtering device of the present invention;

[0036] Figure 3 It is a structural schematic diagram of the centrifuge of the present invention;

[0037] Figure 4 The figure is a flow chart of a method embodiment of the present invention.

[0038] Marks and corresponding parts names in the attached drawings:

[0039] 1. Sedimentation tank; 2. Skid device; 3. Waste liquid tank; 4. Condensate oil tank; 5. Control system; 201. Material inlet; 202. Centrifugal flow pump; 203. Density meter; 204. L-type electronic three-way ball valve; 205. Waste liquid pipe; 206. Device housing; 207. Centrifuge; 208. Filter device; 209. Oil drain pipe; 210. Filter device inlet; 211. Upper housing; 212. Filter cylinder; 213. Lower housing; 214. Filter device outlet; 215. Base; 216. Drive motor; 217. Centrifuge body; 218. Light liquid port; 219. Centrifuge inlet; 221. Heavy liquid port. DETAILED DESCRIPTION

[0040] 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0041] Example 1

[0042] A condensate oil separation device containing floccules, referring to Figure 1-3 It includes a sedimentation tank 1, a skid device 2, a waste liquid tank 3, a condensate tank 4 and a control system 5;

[0043] The skid-type device 2 includes a device housing 206 and a centrifugal flow pump 202, a density meter 203, an L-shaped electronic three-way ball valve 204 and a centrifuge 207 disposed on the device housing 206;

[0044] The centrifuge 207 includes a driving motor 216, a centrifuge 207 body, a light liquid port 218, a centrifuge 207 inlet, and a heavy liquid port 221. The liquid to be treated is quickly separated and layered under the centrifugal action of the drum. Clean condensate oil is discharged from the light liquid port 218 and finally flows into the condensate tank 4. Floccules and water are discharged from the heavy liquid port 221 and finally flow into the waste liquid tank 3.

[0045] The pump inlet of the centrifugal flow pump 202 is connected to the bottom of the sedimentation tank 1, and the pump outlet is connected to one end of the density meter 203. The three ports of the L-type electronic three-way ball valve 204 are respectively connected to the liquid outlet of the density meter 203, the waste liquid tank 3, and the centrifuge 207 inlet of the centrifuge 207 through pipelines. A waste liquid pipe 205 is connected between one port of the L-type electronic three-way ball valve 204 and the waste liquid tank 3; the heavy liquid port 221 of the centrifuge 207 is connected to the waste liquid pipe 205 through a pipeline E, and the centrifuge 207 is connected to the waste liquid tank 3 through the pipeline E and the waste liquid pipe 205. The pipeline E is provided with a solenoid valve, and the light liquid port 218 of the centrifuge 207 is connected to the condensate tank 4 through an oil discharge pipe 209; the density meter 203, the L-type electronic three-way ball valve 204 and the solenoid valve are all electrically connected to the control system 5. Among them, the density meter 203 can be a tuning fork density meter 203 or a differential pressure density meter 203.

[0046] Furthermore, the centrifuge 207 is a disc centrifuge 207 , a tubular centrifuge 207 or a horizontal screw centrifuge 207 .

[0047] Furthermore, the filter device 208 is also included, and the filter device 208 includes an upper shell 211, a filter cylinder 212, a lower shell 213 and a base 215; the lower shell 213 is arranged on the base 215, the upper shell 211 is detachably arranged above the lower shell 213, the filter cylinder 212 is detachably arranged inside the lower shell 213, the upper shell 211 is provided with an inlet of the filter device 208, the upper end of the filter cylinder 212 is connected to the inlet of the filter device 208, and the lower shell 213 is connected to the outlet of the filter device 208. The filter device 208 can be a vertical tank type or a box type. In this embodiment, it is a vertical tank type filter device 208, and when the filter cylinder 212 is used for a long time, flocs will adhere to the aperture of the filter cylinder 212, blocking the filter cylinder 212, and seriously reducing the filtering speed of the filter cylinder 212. Therefore, after a period of use, the upper shell 211 should be disassembled, and the filter cylinder 212 should be disassembled and taken out for cleaning or replacement to ensure the efficiency of the filter device 208.

[0048] The centrifuge 207 inlet is connected to the L-type electronic three-way ball valve 204 through the pipeline A, the filter device 208 inlet is connected to the pipeline A through the pipeline B, and the pipeline B is provided with a solenoid valve. The pipeline A is provided with a solenoid valve on the pipe section along the internal liquid flow direction and crossing the pipeline B; the filter device 208 outlet is connected to the oil drain pipe 209 through the pipeline D, and the pipeline D is provided with a solenoid valve.

[0049] Furthermore, a pipeline C is connected between the section of the oil drain pipe 209 near one end of the centrifuge 207 and the pipeline B, a solenoid valve is provided on the pipeline C, the solenoid valve on the pipeline B is located between the pipeline A and the pipeline C, and a solenoid valve is also provided on the section of the oil drain pipe 209 located between the pipeline C and the pipeline D.

[0050] Furthermore, the filter cylinder 212 is made of stainless steel, non-woven fabric, synthetic fiber or activated carbon, and the filter cylinder 212 is 600-2800 mesh. In this embodiment, the filter 212 is a 2000 mesh filter made of stainless steel, and the filter pore size is 9 microns, which can effectively filter impurities and flocculents with a particle size of more than 9 microns. The filter can be a single layer or multiple layers with the same or different mesh numbers.

[0051] In this embodiment, the L-type electronic three-way ball valve 204 can be connected to the inlet of the centrifuge 207 through the pipeline A, and is connected to the inlet of the filter device 208 through the pipeline. In addition to being connected to the oil outlet 209, the light liquid port 218 of the centrifuge 207 is also connected to the inlet of the filter device 208 through the pipeline C. It is worth noting that there are electronic valves at the intersection of the pipelines to control the on-off status of the pipelines. They are all automatically controlled by the control system 5, so that the condensate oil containing a small amount of flocs can select pipeline A to use the centrifuge 207 for centrifugal treatment, or select pipeline B to use the filter device 208 for filtering treatment, or select pipelines A and B to use the centrifuge 207 and the filter device 208 for simultaneous treatment, and select pipeline C to use the filter device 208 for filtering treatment after centrifugal treatment using the centrifuge 207.

[0052] The present invention also provides a method for separating condensate oil containing floccules, which is applied to the above-mentioned condensate oil separation device containing floccules, and comprises the following steps:

[0053] S1, loading the liquid to be treated containing water, flocs and condensate into a settling tank 1 for preliminary gravity settling, wherein the settling tank 1 contains condensate, flocs and water from top to bottom;

[0054] A density ratio data of the liquid to be treated and the condensate oil is preset, and the density ratio data is greater than 1 and less than 1.1;

[0055] S2, transporting the liquid at the bottom of the liquid to be treated to the inside of the skid device 2 through the centrifugal flow pump 202;

[0056] S3, detecting the real-time density of the passing fluid by means of a densitometer 203;

[0057] S4. Calculate in real time the ratio of the real-time density of the fluid to the density of the condensate oil;

[0058] S5. If the ratio is greater than the preset density ratio data, the L-type electronic three-way ball valve 204 is connected to the pipeline between the waste liquid tank 3, and the fluid is discharged to the waste liquid tank 3 for storage;

[0059] If the ratio is less than or equal to the preset density ratio data, the L-type electronic three-way ball valve 204 is connected to the pipeline between pipeline A, and the fluid flows into the centrifuge 207 and / or the filter device 208 for floc separation, and the fluid after floc separation flows to the condensate oil tank 4 for storage.

[0060] Further, in step S1, the density ratio data is 1.05.

[0061] Further, in step S5,

[0062] If the solenoid valves on pipelines B, C and D are closed, and the solenoid valves on pipelines A, E and the oil drain pipe 209 are opened, the liquid to be treated flows into the centrifuge 207 for separation treatment, and the water and flocs in the liquid to be treated are discharged to the waste liquid tank 3 through pipeline E for storage, and the condensate oil flows into the condensate oil tank 4 through the oil drain pipe 209 for storage.

[0063] Furthermore, in step S5, if the solenoid valves on pipeline B and the oil drain pipe 209 are closed, and the solenoid valves on pipeline A, pipeline C, and pipeline D are opened, the liquid to be treated is first separated by the centrifuge 207, and the condensate oil after separation enters the filter device 208 for filtering, and the condensate oil after filtering finally enters the condensate tank 4 for storage;

[0064] If the solenoid valve on pipeline C is closed, and the solenoid valves on pipelines A, B, D and the oil drain pipe 209 are opened, part of the liquid to be treated enters the centrifuge 207 for separation treatment, and the other part enters the filter device 208 for filtration treatment;

[0065] If the solenoid valves on pipeline A, pipeline C, and oil drain pipe 209 are closed, and the solenoid valve on pipeline B is opened, all the liquid to be treated will enter the filtering device 208 for filtering treatment.

[0066] Furthermore, the connection line controlling the L-type electronic three-way ball valve 204 can also be manually adjusted according to observations of on-site personnel.

[0067] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A condensate oil separation device containing floccules, characterized in that: It comprises a sedimentation tank (1), a skid device (2), a waste liquid tank (3), a condensate oil tank (4) and a control system (5); The skid-type device (2) comprises a device housing (206) and a centrifugal flow pump (202), a density meter (203), an L-shaped electronic three-way ball valve (204) and a centrifuge (207) arranged on the device housing (206); The pump inlet end of the centrifugal flow pump (202) is connected to the bottom of the sedimentation tank (1), and the pump outlet end is connected to one end of the density meter (203); the three ports of the L-shaped electronic three-way ball valve (204) are respectively connected to the liquid outlet end of the density meter (203), the waste liquid tank (3), and the centrifuge inlet (219) of the centrifuge (207) through pipelines; and a pipeline E is connected between the heavy liquid port (220) of the centrifuge (207) and the waste liquid tank (3), and a solenoid valve is provided on the pipeline E; the light liquid port (218) of the centrifuge (207) is connected to the condensate oil tank (4) through an oil discharge pipe (209); the density meter (203), the L-shaped electronic three-way ball valve (204) and the solenoid valve are all electrically connected to a control system.

2. The condensate oil separation device containing floccules according to claim 1, characterized in that: The centrifuge (207) is a disc centrifuge, a tubular centrifuge or a horizontal screw centrifuge.

3. The condensate oil separation device containing floccules according to claim 1, characterized in that: The invention also comprises a filtering device (208), wherein the filtering device (208) comprises an upper shell (211), a filter cylinder (212), a lower shell (213) and a base (215); the lower shell (213) is arranged on the base (215); the upper shell (211) is detachably arranged above the lower shell (213); the filter cylinder (212) is located inside the lower shell (213); a filtering device inlet (210) is arranged on the upper shell (211); the upper end of the filter cylinder (212) is in communication with the filtering device inlet (210); and the lower shell (213) is in communication with a filtering device outlet (215); The centrifuge inlet (219) of the centrifuge (207) is connected to the L-shaped electronic three-way ball valve (204) via a pipeline A; a pipeline B is connected between the filter device inlet (210) and the pipeline A, and a solenoid valve is arranged on the pipeline B; a solenoid valve is arranged on the pipeline section of the pipeline A along the internal liquid flow direction and crossing the pipeline B; a pipeline D is connected between the filter device outlet (215) and the oil drain pipe (209), and a solenoid valve is arranged on the pipeline D.

4. A flocculent condensate separation device according to claim 3, characterized in that: A pipeline C is connected between the centrifuge inlet (219) and pipeline B, and a solenoid valve is provided on the pipeline C. The solenoid valve on the pipeline B is located between pipeline A and pipeline C. A solenoid valve is also provided on the oil discharge pipe (209) section located between the centrifuge inlet (219) and pipeline D.

5. The flocculent condensate separation device according to claim 3, characterized in that: The filter cylinder (212) is made of stainless steel, non-woven fabric, synthetic fiber or activated carbon.

6. The flocculent condensate separation device according to claim 3, characterized in that: The filter cylinder (212) has a mesh size of 600 to 2800.

7. A method for separating condensate oil containing floccules, characterized in that: The flocculent condensate separation device used in any one of claims 1 to 6 comprises the following steps: S1, placing the liquid to be treated containing water, flocs and condensate oil into a sedimentation tank (1) for preliminary gravity sedimentation, wherein the sedimentation tank (1) contains condensate oil, flocs and water from top to bottom; Preset a density ratio data of the liquid to be treated and the condensate oil, wherein the density ratio data is greater than 1 and less than 1.1; S2, transporting the liquid at the bottom of the liquid to be treated to the inside of the skid-type device (2) through a centrifugal flow pump (202); S3, detecting the real-time density of the passing fluid by means of a densitometer (203); S4, calculating in real time the ratio of the real-time density of the fluid to the density of the condensate oil through the control system; S5. If the ratio is greater than the preset density ratio data, the L-shaped electronic three-way ball valve (204) is connected to the pipeline between the waste liquid tank (3), and the fluid is discharged into the waste liquid tank (3) for storage; If the ratio is less than or equal to the preset density ratio data, the L-type electronic three-way ball valve (204) is connected to the pipeline between the pipeline A, and the fluid flows into the centrifuge (207) and / or the filter device (208) to separate the flocs, and the fluid after the flocs are separated flows into the condensate oil tank (4) for storage.

8. The method for separating condensate oil containing floccules according to claim 7, characterized in that: In step S1, the density ratio data is 1.

05.

9. The method for separating condensate oil containing floccules according to claim 7, characterized in that: In step S5, If the solenoid valves on pipelines B, C and D are closed, and the solenoid valves on pipelines A, E and the oil discharge pipe (209) are opened, the liquid to be treated flows into the centrifuge (207) for separation treatment, and the water and floccules in the liquid to be treated are discharged to the waste liquid tank (3) through pipeline E for storage, and the condensate oil flows into the condensate oil tank through the oil discharge pipe (209) for storage.

10. The method for separating condensate oil containing floccules according to claim 7, characterized in that: In step S5, if the solenoid valves on pipeline B and the oil drain pipe (209) are closed, and the solenoid valves on pipeline A, pipeline C, and pipeline D are opened, the liquid to be treated is first separated by the centrifuge (207), and the condensate oil after separation enters the filtering device (208) for filtering, and the condensate oil after filtering is finally stored in the condensate oil tank; If the solenoid valve on pipeline C is closed, and the solenoid valves on pipelines A, B, D and the oil drain pipe (209) are opened, a portion of the liquid to be treated enters the centrifuge (207) for separation treatment, and the other portion enters the filtering device (208) for filtering treatment; If the solenoid valves on pipeline A, pipeline C and oil drain pipe (209) are closed and the solenoid valve on pipeline B is opened, all the liquid to be treated will enter the filtering device (208) for filtering treatment.

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