CN110778303A - Multistage swing type oil-gas-sand separation device - Google Patents

Abstract

The invention provides a multi-stage swing type oil and gas sand separation device, which belongs to the field of auxiliary tools and equipment for downhole oil production. , Gas and sand inlet and outlet holes, an oil and gas separation mechanism is arranged above the inside of the casing, an oil sand separation mechanism is arranged below the inside of the casing, and a sand discharge port is fixedly connected to the lower end of the casing. The oil and gas separation mechanism is a valve body, A one-way exhaust valve composed of a ball core and a valve seat, an inner spiral channel composed of an exhaust pipe, a small spiral guide plate, and an oil pipe, a joint, and an outer part composed of the upper half of the oil pipe with holes and a large spiral guide plate. The spiral channel is connected from top to bottom. The oil sand separation mechanism is composed of the lower half of the oil pipe with holes, multiple diversion hoods, and multiple sand filters. It provides a super separation effect and is convenient for maintenance. At the same time, the replacement and maintenance costs are not high, and it is not easy to cause the gas well to stop production for a long time.

Description

A multi-stage swing oil and gas sand separation device

technical field

The invention belongs to the field of auxiliary tools and equipment for downhole oil production, in particular to a multi-stage swing type oil and gas sand separation device.

Background technique

At present, in the surface engineering of oil and gas well exploitation, the oil and gas well production fluid is a mixed fluid composed of oil, gas, etc., and mud and sand are also mixed in the mixed fluid. Seriously, it has caused great harm to the ground gathering, transportation and processing system, causing blockage and corrosion of downstream pipelines, valves, separators and other equipment, increasing the workload of sand cleaning and maintenance of equipment and pipelines.

The existing separation device is not suitable for high pressure 30000PSI and high erosion conditions and acid (CO2, H2S, HC1) conditions, and the original flange installation structure is used, which is difficult to disassemble and install. In the original structure, the separation barrel It is easy to be damaged by the impact of sand and gravel, which damages the internal equipment, the separation effect is not good, the replacement and maintenance costs are high, and the cycle is long, causing the gas well to stop production for a long time.

SUMMARY OF THE INVENTION

The object of the present invention is to provide a multi-stage swing type oil and gas sand separation device, which aims to solve the blockage and corrosion of equipment such as downstream pipelines, valves and separators in the prior art, and increases the workload of equipment and pipeline sand cleaning and maintenance. High maintenance cost and low oil yield.

In order to achieve the above purpose, the present invention provides the following technical solutions: a multi-stage swing type oil and gas sand separation device, comprising a casing, the middle and upper walls of the casing are provided with densely distributed oil, gas, sand inlet and outlet holes, The upper part of the casing is provided with an oil and gas separation mechanism, the lower part of the inner part of the casing is provided with an oil sand separation mechanism, and the lower end of the casing is fixedly connected with a sand discharge port, which is characterized in that the oil and gas separation mechanism is a One-way exhaust valve composed of valve body, ball core and valve seat, an inner spiral channel composed of exhaust pipe, small spiral guide plate, oil pipe, a joint, and an upper half section of oil pipe with holes, large spiral guide plate The outer spiral channel is connected from top to bottom. The oil sand separation mechanism is composed of the lower half of the oil pipe with holes, a plurality of diversion hoods, and a plurality of sand filter screens. The lower end of the valve body is composed of It is fixedly connected to the upper end of the sleeve.

In order to facilitate the fixed connection of the valve body in the casing, and the easy connection and disassembly of the valve body with the oil pipe and the joint, as a preferred embodiment of the present invention, the lower end of the valve body is tapered, and the lower end of the valve body is drilled with a circular hole The upper end face of the valve body is machined with a taper pipe threaded hole, and the lower end face of the valve body is machined with a transition taper hole and a taper pipe threaded hole.

In order to make the separated gas flow upwards out of the separator, as a preferred embodiment of the present invention, the small spiral guide plate is fixedly connected to the circumferential surface of the exhaust pipe, and the large spiral guide plate is fixedly connected to the circumferential surface of the perforated oil pipe. , and the large spiral guide plate is drilled with dense ventilation holes.

In order to make the joint better connect the oil pipe and the oil pipe with holes, and facilitate the oil circulation, as a preferred embodiment of the present invention, the joint outline is cylindrical, and the upper and lower ends of the joint are machined with taper pipe threaded holes. A threaded blind hole is machined at the center of the inner middle of the joint, and uniform distribution holes are drilled around the threaded blind hole.

In order to allow the oil pump to absorb more oil when sucking, as a preferred option of the present invention, densely covered oil-penetrating holes are drilled on the pipe string of the lower half of the oil pipe with holes, and the lower half of the oil pipe with holes The circumferential surface of the segment is fixedly connected with a plurality of shrouds and a plurality of sand filter screens.

In order to further separate the oil sand and allow the oil to enter the oil pipe with holes, as a preferred option of the present invention, the plurality of diversion hoods and the plurality of sand filter screens are in the shape of a "half cone", and the diversion The cone surfaces of the hood are all upward, and the cone surfaces of the sand filter screen are all downward.

In order to make the oil waste that has been separated can be directly sucked up by the oil pump, as a preferred option of the present invention, the upper end of the sand discharge port is provided with a sand discharge valve, and the middle of the sand discharge valve is disconnected, so The sand discharge valve is movably connected to the left and right inner walls of the casing.

Compared with the prior art, the beneficial effects of the present invention are:

1. Separation of oil and gas sand The separation of oil and gas sand is carried out for multiple times in the casing, which has super strong separation ability of oil and gas sand, so that the separation of oil and gas sand is more thorough and the oil production is higher.

2. The internal structure is simple, and the material is reduced compared with the previous oil and gas sand separator device, which reduces the production cost and use cost, thereby reducing the replacement cost and maintenance cost. More reserves can be used to prevent a certain equipment from breaking down. Replacement without delaying oil production or shutting down gas wells.

3. There is a sand discharge valve inside, so that the separated oil is directly sucked by the oil pump, which is not easy to cause little waste or even secondary separation.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the specification, and are used to explain the present invention together with the embodiments of the present invention, and do not constitute a limitation to the present invention. In the attached image:

1 is a cross-sectional view of the present invention;

2 is a partial cross-sectional view of the upper part of the one-way exhaust valve 18 of the present invention;

Fig. 3 is the partial sectional view of joint 8 of the present invention;

4 is a partial cross-sectional view of the outer helical channel 16 of the present invention;

FIG. 5 is a partial cross-sectional view of the sand discharge port 14 of the present invention.

In the picture: 1- valve body; 2- ball core; 3- valve seat; 4- exhaust pipe; 5- small spiral guide plate; 6- oil pipe; 7- casing; 8- joint; 9- oil pipe with holes; 10 -Large spiral guide; 11-Guide; 12-Sand filter; 13-Base; 14-Sand discharge port; 15-Sand discharge valve; 16-Outer spiral channel; 17-Inner spiral channel; 18-One-way row air valve.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Example 1

Please refer to Figures 1-5, the present invention provides the following technical solutions:

In a specific embodiment of the present invention, a casing 7 is included. The middle and upper walls of the casing 7 are provided with oil, gas and sand inlet and outlet holes that are evenly distributed, so as to facilitate the entry of oil, gas and sand in large quantities. The oil and gas separation mechanism is provided. The oil and gas separation mechanism is a one-way exhaust valve 18 composed of a valve body 1, a ball core 2, and a valve seat 3, and an inner spiral composed of an exhaust pipe 4, a small spiral guide plate 5, and an oil pipe 6. The channel 17, a joint 8, and an outer spiral channel 16 composed of the upper half of the perforated oil pipe 9 and the large spiral guide plate 10 are connected from top to bottom. The one-way exhaust valve 18 consists of the valve body 1, It consists of a ball core 2 and a valve seat 3. The outer profile of the valve body 1 is cylindrical, and there is a boss at the lower end. The boss is machined with inclined exhaust holes and external threads, which are used to connect with the upper end of the sleeve 7. On the valve body 1 The end face is machined with taper pipe threaded holes, which are used to connect with the oil pump. The lower end face of the valve body 1 is machined with transition taper holes and taper pipe threaded holes, which are used to connect with the oil pipe 6. The middle and upper parts of the valve body 1 are threaded at the center. There are evenly distributed circulation holes around the valve cavity hole. Between the evenly distributed circulation holes, there are 1 to 2 inclined holes that communicate with the middle valve cavity hole. The middle and lower part of the valve body 1 is a circular The hole is used to accommodate the valve seat 3. The valve seat 3 is a hollow rotating body, which is placed in the middle and lower part of the valve body 1. The upper end is connected with the valve cavity hole in the middle of the valve body 1 through threads. The ball core 2 is a smooth poly The tetrafluoroethylene ball is placed in the upper port of the valve seat 3 and the valve cavity hole in the middle of the valve body 1. Under the push of the gas, it can move upward to discharge the gas out of the separator.

The inner spiral channel 17 is composed of an exhaust pipe 4, a small spiral guide plate 5, and an oil pipe 6. The upper end of the exhaust pipe 4 is open and inserted into the valve seat 3 of the one-way exhaust valve 18. The threaded blind hole in the center of the joint 8 is connected; the side of the exhaust pipe 4 is densely covered with ventilation holes from top to bottom, and is surrounded by a small spiral guide plate 5. The upper and lower ends of the oil pipe 6 are processed with external taper threads, which are respectively connected with The lower end of the valve body 1 is connected to the taper pipe threaded hole on the upper end of the joint 8, and the exhaust pipe 4 and the small spiral guide plate 5 are contained in the pipe, and an inner spiral channel 17 is formed between the exhaust pipe 4 and the oil pipe The oil is separated from oil and gas. The joint 8 is the conversion part of the inner spiral channel 17 and the outer spiral channel 16. The outer contour is cylindrical, and the upper and lower ends are machined with taper pipe threaded holes, which are used to connect the oil pipe 6 and the oil pipe with holes respectively. 9. A threaded blind hole is machined at the center of the inner middle for installing the exhaust pipe 4. The threaded blind hole is surrounded by evenly distributed circulation holes to facilitate the passage of oil.

The outer spiral channel 16 is composed of the upper half of the oil pipe with holes 9 and the large spiral guide plate 10. The upper end of the oil pipe with holes 9 is connected with the taper pipe threaded holes on the lower end face of the joint 8 through the outer thread of the tapered pipe. The oil pipe with holes 9 The upper half of the casing is smooth without holes, surrounds the large spiral guide plate 10, and forms an outer spiral channel 16 between the casing 7 and the casing 7. The oil, gas and sand entering from the upper hole in the casing 7 are separated from oil and gas. 10 The inner edge of the continuous surface is densely covered with ventilation holes, so that the separated gas can flow upwards out of the separator.

An oil sand separation mechanism is arranged under the inside of the casing 7. The oil sand separation mechanism is composed of the lower half of the oil pipe 9 with holes, a plurality of diversion hoods 11, a plurality of sand filter screens 12, and a base 13. The oil pipe 9 with holes is composed of The lower half of the pipe string is densely covered with oil-penetrating holes, and the cumulative area of the densely-distributed oil-penetrating holes is larger than the cross-sectional area of the inner hole of the oil pipe 9 with holes. For the multiple guide hoods 11 and the single-layer sand filter screen 12 covering the lower half of the tubing string of the perforated oil pipe 9, the conical surfaces of the guide cover 11 are all upward, and the conical surfaces of the sand filter screen 12 are all downward. During the cycle operation of the oil pump, under the action of gravity and backflow, the sand blocked on the sand filter screen 12 can be automatically removed. The top and bottom ends of the conical surface of the diversion cover 11 are processed with transitional circular steps. A circular arc groove is machined on the top, and at the circular step at the top of each shroud 11, it is connected with the oil pipe 9 with holes by means of interval spot welding. Several single-layer sand filters 12, except for the fixed overlapping parts of the diversion cover 11, have a penetration area larger than the cumulative area of the oil penetration holes densely distributed on the lower half of the tubing string with holes 9 to ensure sufficient oil penetration The lowermost sand filter screen is fixedly connected to the upper end of the base 13 .

The lower end of the casing 7 is fixedly connected with a sand discharge port 14. The separated sand is discharged from the sand discharge port 14 due to the blocking of the sand filter screen 12 and the action of gravity. If it is broken, it will be replaced in time, and the progress of oil production will not be achieved.

Specifically, please refer to Figure 1-5, the lower end of the valve body 1 is tapered, and the lower end of the valve body 1 is drilled with a circular hole, the upper end surface of the valve body 1 is machined with taper pipe threaded holes, and the lower end surface of the valve body 1 is machined with Transition taper holes and taper pipe threaded holes.

In this embodiment, the lower end of the valve body 1 is tapered to facilitate fixed connection to the inner wall of the casing 7, and the lower end surface of the valve body 1 is machined with transition cone holes and taper pipe threaded holes to facilitate connection and disassembly with the oil pipe 6 and the joint 8.

Specifically, please refer to FIGS. 1-5, the small spiral guide plate 5 is fixedly connected to the circumferential surface of the exhaust pipe 4, the large spiral guide plate 10 is fixedly connected to the circumferential surface of the oil pipe 9 with holes, and the large spiral guide plate 10 is densely drilled. Ventilation holes.

In this embodiment, the small spiral guide plate 5 and the large spiral guide plate 10 play the role of breaking the air bubbles in the oil layer, so that the gas oil and gas can be better separated and flow out upward.

Specifically, please refer to Figures 1-5. The outline of the joint 8 is cylindrical, and the upper and lower ends of the joint 8 are machined with taper pipe threaded holes, and a threaded blind hole is machined in the center of the inner middle of the joint 8. The threaded blind hole There are evenly distributed circulation holes around it.

In this embodiment, the joint 8 is used as a conversion part between the inner helical channel 17 and the outer helical channel 16, and plays the role of connecting the oil pipe 6 and the perforated oil pipe 9. The threaded blind holes drilled through the joint 8 make the oil flow more smoothly.

Specifically, please refer to FIGS. 1-5 , the plurality of shrouds 11 and the plurality of sand filters 12 are all in the shape of “half cones”, the conical surfaces of the shrouds 11 are all upward, and the conical surfaces of the sand filters 12 are all downward .

In this embodiment, the deflector hood 11 plays the role of diversion, and the sand filter screen 12 plays the role of separating oil and sand.

Specifically, please refer to 1-5, the upper end of the sand discharge port 14 is provided with a sand discharge valve 15 , the middle of the sand discharge valve 15 is disconnected, and the two movable links of the sand discharge valve 15 are connected to the left and right inner walls of the casing 7 .

In this embodiment: the sand discharge valve 15 plays the role of controlling the sand discharge from the sand discharge port 14. When the separated sand accumulates to a certain level, it will automatically open due to gravity reasons, so that some of the separated oil will not be accompanied by the sand. Discharge to avoid secondary separation.

The working principle and use process of the present invention: the mixed liquid of natural oil (solid arrow), gas (dotted arrow) and sand (dotted arrow) enters the separator from the densely covered holes in the upper part of the casing 7, under the action of gravity When flowing down along the annular space of the oil pipe 6 and the casing 7, the bubbles first burst, separated from the oil sand, floated up, and discharged from the lower end of the valve body 1. The oil sand went down through the joint 8 and entered the outer spiral channel 16, where Under the apportioning action of the large spiral guide plate 10, the medium bubbles in the oil layer are ruptured, the gas passes through the ventilation holes on the inner edge of the large spiral guide plate 10, and flows out of the separator upward, and the oil sand continues to descend along the outer edge of the large spiral guide plate 10, entering The oil sand separation mechanism, due to the different specific gravity of the oil sand, will form a situation where the sand is outside and the oil is inside when it descends along the conical surface of the diversion cover 11. When the oil pump sucks, the oil will pass through the sand filter screen 12. 2. Enter the perforated oil pipe 9 and go up. The sand is accumulated on the sand discharge valve 15 under the action of the sand filter screen 12 and gravity. When a certain amount is reached, it is discharged through the sand discharge port 14. The upward oil passes through the interior of the joint 8. The flow hole of the cloth enters the inner spiral channel 17, and under the apportioning action of the small spiral guide plate 5, the small bubbles contained in it are split, and the gas enters the middle exhaust pipe 4, and pushes the ball core 2 upward to discharge the separator. Under the action of centrifugal force, it goes upward along the outer edge of the small spiral guide plate 5, passes through the periphery of the valve seat 3 and the flow hole of the valve body 1, and enters the output well of the oil pump.

Finally, it should be noted that the above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, the The technical solutions described in the foregoing embodiments may be modified, or some technical features thereof may be equivalently replaced. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (7)

1. A multi-stage swing type oil and gas sand separation device: comprising a casing (7), the middle and upper walls of the casing (7) are provided with well-distributed oil, gas, sand inlet and outlet holes, the casing An oil and gas separation mechanism is arranged above the inside of (7), an oil sand separation mechanism is arranged below the inside of the casing (7), and a sand discharge port (14) is fixedly connected to the lower end of the casing (7). It is: the oil and gas separation mechanism is a one-way exhaust valve (18) composed of a valve body (1), a ball core (2), and a valve seat (3), a one-way exhaust valve (18) composed of an exhaust pipe (4), a small spiral guide plate (5) ), an inner spiral channel (17) composed of an oil pipe (6), a joint (8), and an outer spiral channel (16) composed of the upper half of the oil pipe (9) with holes and a large spiral guide plate (10). Connected from top to bottom, the oil sand separation mechanism is composed of the lower half of the oil pipe (9) with holes, a plurality of diversion hoods (11), a plurality of sand filter screens (12), and a base (13). , the lower end of the valve body (1) is fixedly connected to the upper end of the sleeve (7). 2. A multi-stage swing type oil and gas sand separation device according to claim 1, characterized in that: the lower end of the valve body (1) is tapered, and the lower end of the valve body (1) is drilled with a circular hole The upper end face of the valve body (1) is machined with a taper pipe threaded hole, and the lower end face of the valve body (1) is machined with a transition taper hole and a taper pipe threaded hole. 3. A multi-stage swing type oil and gas sand separation device according to claim 2, characterized in that: the small spiral guide plate (5) is fixedly connected to the circumferential surface of the exhaust pipe (4), and the large spiral guide plate (5) The spiral guide plate (10) is fixed and connected to the circumferential surface of the perforated oil pipe (9), and the large spiral guide plate (10) is drilled with dense ventilation holes. 4. A multi-stage swing type oil and gas sand separation device according to claim 3, characterized in that: the outer profile of the joint (8) is cylindrical, and the upper and lower ends of the joint (8) are machined with cones As for the pipe threaded hole, a threaded blind hole is machined at the inner center of the joint (8), and evenly distributed circulation holes are drilled around the threaded blind hole. 5. A multi-stage swing type oil and gas sand separation device according to claim 4, characterized in that: the pipe string of the lower half section of the oil pipe with holes (9) is drilled with dense oil-penetrating holes, and the A plurality of diversion covers (11) and a plurality of sand filter screens (12) are fixedly connected to the circumferential surface of the lower half of the oil pipe with holes (9). 6. A multi-stage swing type oil and gas sand separation device according to claim 5, characterized in that: the plurality of diversion hoods (11) and the plurality of sand filter screens (12) are formed into "half cones" The conical surfaces of the shroud (11) are all upward, and the conical surfaces of the sand filter screen (12) are all downward. 7. A multi-stage swing type oil and gas sand separation device according to claim 6, characterized in that: the upper end of the sand discharge port (14) is provided with a sand discharge valve (15), and the sand discharge valve ( 15), the sand discharge valve (15) is movably connected to the left and right inner walls of the casing (7).

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