CN117108277A - Wellhead full liquid sampling device - Google Patents

Abstract

The invention provides a wellhead full-liquid sampling device, which belongs to the technical field of oil well sampling, and comprises a production pipe; the supercharging assembly is provided with a plurality of groups, each group of supercharging assembly comprises a closed groove, an oil storage groove, an oil inlet, a water pressure groove, an air pressure groove, a differential pressure pushing plate, a sealing plate and a first oblique angle, the oil inlet is formed in the circumferential surface of the oil extraction pipe, the closed groove is formed in the oil extraction pipe and is communicated with the oil inlet, the oil storage groove is formed in the lower inner wall of the closed groove, the water pressure groove is formed in the lower inner wall of the oil storage groove, the air pressure groove is formed in the lower inner wall of the water pressure groove, the differential pressure pushing plate is slidably connected in the water pressure groove, the sealing plate is respectively closed with the oil storage groove when the oil extraction pipes are located at different depths, and crude oil of different depth oil layers can be collected and sampled at one time.

Description

Wellhead full liquid sampling device

Technical field

The invention belongs to the technical field of oil well sampling, and specifically relates to a wellhead full liquid sampling device.

Background technique

Taking oil samples at the wellhead of a pumping unit is the most basic operational skill in daily management of oil wells. Through laboratory analysis of the oil samples taken, the physical parameters of the oil well produced fluid are obtained, which provides a basis for dynamic analysis of oil well production and improvement of oil well management measures.

After searching, it was found that an automatic oil well sampling device is disclosed in the Chinese patent with the authorization announcement number "CN108316921B". The automatic oil well sampling device includes: a pipe sleeve. The pipe sleeve is a cylindrical tube with one end open. The pipe The open end of the sleeve is provided with a connecting portion, the closed end of the pipe sleeve is provided with a first iron core, and a winding coil is provided on the iron core; a movable core, the movable core is arranged inside the pipe sleeve, and the The outer wall of the movable core is in close contact with the inner wall of the pipe sleeve. The movable core can move along the axial direction of the pipe sleeve. A second iron core is provided on the upper part of the movable core. There is a second iron core on the second iron core. There is a winding coil, the second iron core is arranged opposite to the first iron core; a sampling tube, the sampling tube is detachably connected to the pipe sleeve through the connecting part; wherein, by controlling the first iron core The direction of the energizing current of the winding coils of the core and the second iron core is used to control the first iron core and the second iron core to move closer or farther away.

The above invention controls the direction of the energizing current of the winding coils of the first iron core and the second iron core, so that the second iron core is close to the first iron core, that is, the movable core is lifted upward to extract the petroleum solution into the sampling tube. However, the above invention and the present invention In the existing technology, oil from one oil layer can only be sampled in one sampling operation. When it is necessary to detect the quality of oil at different depths in the same oil field, it is necessary to go deep into the oil well multiple times for sampling, which reduces the efficiency of oil well sampling.

Contents of the invention

The purpose of the present invention is to provide a wellhead full-liquid sampling device, aiming to solve the problem in the prior art that oil in one oil layer can only be sampled in one sampling operation. When it is necessary to detect oil quality at different depths in the same oil field, it is necessary to go deep into the oil well multiple times. Sampling reduces the problem of oil well sampling efficiency.

In order to achieve the above objects, the present invention provides the following technical solutions:

Wellhead full liquid sampling device, including:

oil production pipe;

A boosting assembly is provided with multiple groups. Each group of the boosting assembly includes a closed tank, an oil storage tank, an oil inlet, a water pressure tank, an air pressure tank, a differential pressure push plate, a closing plate and a first Bevel angle, the oil inlet is opened on the circumferential surface of the oil production pipe, the closed groove is opened in the oil production pipe and connected with the oil inlet, the oil storage tank is opened on the lower inner wall of the closed groove, the water pressure tank is opened On the lower inner wall of the oil storage tank, the air pressure tank is opened on the lower inner wall of the water pressure tank. The pressure difference push plate is slidingly connected in the water pressure tank. The closing plate is fixedly connected to the upper end of the pressure difference push plate and is connected with the sealing plate. The grooves match, and the first bevel is opened at both ends of the differential pressure push plate;

Push components, the push components are provided in multiple groups, each group of push components includes a connecting hole, a push slot, a push rod, a first push rod, a second push rod, a spring groove and a push spring, and the first push component There are two rods, second push rods, spring grooves and pushing springs. The connecting hole is opened on one side of the inner wall of the water pressure tank. The pushing groove is opened on one side of the inner wall of the connecting hole. The pushing rod slides Connected in the connecting hole, one end of the push rod is in contact with the first bevel, the two second push rods are respectively connected to the inner walls of both sides of the push groove through rotation of the rotating shaft, and the two spring grooves are respectively Opened at one side end of the two second push rods, the two first push rods are respectively connected to the two side ends of the push rod through a rotating shaft and slide in the two spring grooves respectively, and the two push springs are respectively Fixedly connected to one inner wall of two spring grooves and one side end of two first push rods;

Limiting components, the limiting components are provided in multiple groups, and each group of the limiting components includes a connecting groove, a limiting chute, a connecting rod, a limiting insert block and a limiting slot, and the connecting groove is opened at One end of the differential pressure push plate, the limit chute is opened on one inner wall of the connecting groove, the connecting rod is fixedly connected to one end of the first bevel and slides in the connecting groove, the limiting chute is The slot is opened on one inner wall of the limit chute, and the limit insert block is fixedly connected to the upper end of the connecting rod and matches the limit slot.

As a preferred solution of the present invention, a second bevel is provided at one end of the limiting insert block.

As a preferred solution of the present invention, one side end of the first push rod is fixedly connected to a limiting ring, and the diameter of the limiting ring is larger than the side end opening of the spring groove.

As a preferred solution of the present invention, a pressing groove is provided on one side of the inner wall of the plurality of pushing grooves, and a pressing plate is fixedly connected to one end of the plurality of pushing rods. The plurality of pressing plates are respectively Slide in multiple push grooves.

As a preferred solution of the present invention, a plurality of closing grooves are provided on the side inner walls of the plurality of pressing grooves, a plurality of closing plates are slidably connected in the plurality of closing grooves, and the side ends of a plurality of the closing plates are provided with frictional grooves. piece.

As a preferred solution of the present invention, valve cores are provided in each of the plurality of air pressure grooves.

As a preferred solution of the present invention, an oil production base is provided on the upper side of the oil production pipe. A runner is rotatably connected to the upper end of the oil production base. A motor holder is fixedly connected to a side end of the oil production base. The motor holder is A driving motor is fixedly connected inside, and the output end of the driving motor is connected with the runner.

As a preferred solution of the present invention, a pull rope is fixedly connected to the circumferential surface of the runner, a pull block is fixedly connected to the lower end of the pull rope, a threaded groove is provided at the lower end of the pull block, and the upper end of the oil production pipe is fixed A threaded rod is connected, and the threaded rod is threadedly connected to the thread groove.

As a preferred solution of the present invention, a third bevel is provided at the lower end of the oil production base.

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

1. Through this device, the air pressure in the air pressure tank is adjusted before oil production to increase the air pressure in different air pressure tanks step by step. After the oil production pipe slowly penetrates into the oil layer, the sealing plate is squeezed according to the water pressure at different depths of the oil production pipe. The oil storage tank is closed at different depths so that the oil production pipe can collect and sample crude oil from oil layers at different depths at one time.

2. Through this device, the air pressure tank is connected to the valve core to change the pressure in the air pressure tank, and then control the water pressure required when the closing plate completely closes the oil storage tank to change the sampling depth of each oil storage tank.

3. With this device, after the closing plate is closed, the push rod pulls the limit insert block and inserts it into the limit slot. When the oil production pipe is pulled up, the pressure difference push plate is fixed by the limit insert block so that the closing plate cannot be The air pressure in the pressure tank opens, and the operator can press the push plate to push the limit insert block out of the limit slot to release the fixed restriction on the pressure difference push plate, allowing the crude oil in the oil storage tank to flow out to complete sampling.

Description of drawings

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

Figure 1 is a structural perspective view of the present invention;

Figure 2 is a cross-sectional view of the first structure in the present invention;

Figure 3 is a cross-sectional exploded view of the first structure in the present invention;

Figure 4 is a second cross-sectional view in the present invention;

Figure 5 is a second cross-sectional exploded view in the present invention;

Figure 6 is a third cross-sectional exploded view of the present invention;

Figure 7 is a fourth cross-sectional exploded view in the present invention;

Figure 8 is an enlarged view of position A in Figure 6 of the present invention;

Figure 9 is an enlarged view of B in Figure 6 of the present invention;

Figure 10 is an enlarged view of C in Figure 7 of the present invention;

Figure 11 is a cross-sectional view of the internal structure of the oil production pipe in the present invention.

In the picture: 1. Oil production pipe; 2. Closed tank; 3. Oil storage tank; 4. Oil inlet; 5. Water pressure tank; 6. Air pressure tank; 7. Pressure difference push plate; 8. Closed plate; 9. Connection Hole; 10, push groove; 11, push rod; 12, first push rod; 13, second push rod; 14, spring groove; 15, push spring; 16, limit ring; 17, first bevel; 18 , connecting groove; 19. limit chute; 20. connecting rod; 21. limit insert; 22. limit slot; 23. push groove; 24. push plate; 25. closing slot; 26. closed Plate; 27. Friction block; 28. Valve core; 29. Oil production base; 30. Runner; 31. Motor holder; 32. Drive motor; 33. Pull rope; 34. Pulling block; 35. Threaded groove; 36. Threaded rod; 37, second bevel; 38, third bevel.

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 some 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 fall within the scope of protection of the present invention.

Example 1

Please refer to Figures 1-11. The present invention provides the following technical solutions:

Wellhead full liquid sampling device, including:

Production pipe 1;

There are multiple sets of boosting components. Each set of boosting components includes a closed tank 2, an oil storage tank 3, an oil inlet 4, a water pressure tank 5, an air pressure tank 6, a differential pressure push plate 7, and a closing plate 8. and the first bevel 17, the oil inlet 4 is opened on the circumferential surface of the oil production pipe 1, the closed groove 2 is opened in the oil production pipe 1 and connected with the oil inlet 4, the oil storage tank 3 is opened on the lower inner wall of the closed groove 2, The water pressure tank 5 is opened on the lower inner wall of the oil storage tank 3, the air pressure tank 6 is opened on the lower inner wall of the water pressure tank 5, the pressure difference push plate 7 is slidingly connected in the water pressure tank 5, and the closing plate 8 is fixedly connected to the pressure difference push plate The upper end of 7 matches the closed groove 2, and the first bevel 17 is opened at both ends of the differential pressure push plate 7;

The push assembly is provided with multiple groups. Each push assembly includes a connecting hole 9, a push slot 10, a push rod 11, a first push rod 12, a second push rod 13, a spring slot 14 and a push spring 15. The first There are two push rods 12, second push rods 13, spring grooves 14 and pushing springs 15. The connecting hole 9 is opened on one inner wall of the hydraulic tank 5, and the pushing groove 10 is opened on one inner wall of the connecting hole 9. The push rod 11 is slidably connected in the connecting hole 9. One end of the push rod 11 is in contact with the first bevel 17. The two second push rods 13 are respectively connected to the inner walls of both sides of the push groove 10 through rotating shafts. The spring grooves 14 are respectively opened at one side end of the two second push rods 13. The two first push rods 12 are respectively connected to both sides of the push rod 11 through rotation shafts and slide in the two spring grooves 14 respectively. Each push spring 15 is fixedly connected to one side inner wall of the two spring grooves 14 and one side end of the two first push rods 12;

The limit components are provided with multiple groups. Each group of limit components includes a connecting groove 18, a limiting chute 19, a connecting rod 20, a limiting insert block 21 and a limiting slot 22. The connecting groove 18 is opened at On one side of the differential pressure push plate 7, the limit chute 19 is opened on one side of the inner wall of the connecting groove 18. The connecting rod 20 is fixedly connected to one end of the first bevel 17 and slides in the connecting groove 18 to limit the position. The slot 22 is opened on one inner wall of the limiting chute 19 . The limiting insert block 21 is fixedly connected to the upper end of the connecting rod 20 and matches the limiting slot 22 .

In a specific embodiment of the present invention, the oil production pipe 1 is used to collect and sample crude oil in the underground oil layer. The oil production pipe 1 is equipped with a multi-layer oil production mechanism. Each layer of oil production mechanism samples the crude oil of the oil layer at different depths. The oil storage tank 3 in an oil production layer is used to store and collect crude oil. The air pressure in the air pressure tank 6 is greater than one atmosphere. The pressure difference push plate 7 slides in the water pressure tank 5 and blocks the air pressure tank 6 to avoid high-pressure air in the air pressure tank 6. Leakage, the air pressure in the air pressure tank 6 pushes the pressure difference push plate 7 to make the sealing plate 8 resist the upper inner wall of the sealing groove 2. The shape of the sealing groove 2 and the sealing plate 8 is the same. When the sealing plate 8 closes the sealing groove 2, the oil storage tank The crude oil collected in 3 is sealed in the oil storage tank 3. Specifically, according to Figure 10 of the accompanying drawings of the description, when the air pressure in the air pressure tank 6 pushes the pressure difference push plate 7 to make the closing plate 8 resist the upper inner wall of the closing tank 2, The first push rod 12 is located on the right side of the second push rod 13. The push spring 15 is in a compressed state. The thrust of the push spring 15 pushes the push rod 11 to always resist the hypotenuse of the first bevel 17. The push rod 11 is in contact with the first bevel. The contact surface of the bevel 17 is an inclined surface so that when the pressure difference push plate 7 slides downward, it will push the push rod 11 to slide into the push groove 10. When it is necessary to collect crude oil from oil layers of different depths, the oil production pipe 1 is put into the oil well. And slowly falling, the oil is poured into the oil storage tank 3 from the oil inlet 4. As the oil production pipe 1 continues to decline, the water pressure also increases. What resists the pressure difference push plate 7 and the closing plate 8 is the pressure in the air pressure tank 6. The air pressure and push spring 15 push the push rod 11 against the thrust of the first bevel 17. When the water pressure at the upper end of the pressure difference push plate 7 is greater than the sum of the air pressure and thrust in the air pressure tank 6, the pressure difference will push the pressure difference push plate. 7. Slide toward the lower end of the water pressure tank 5 and the air pressure tank 6, and squeeze one side of the push rod 11 through the first bevel 17 to push the push rod 11 to slide toward the left end of the push tank 10. At this time, the first push rod 12. The angle between the second push rod 13 and the push rod 11 gradually becomes vertical, and the distance between the first push rod 12 and the second push rod 13 continues to shrink, so that the push spring 15 further contracts. With the water pressure gradually increases, when the first bevel angle 17 completely pushes the push rod 11 into the connecting hole 9, at this time the first push rod 12 slides to the left side of the second push rod 13 in Figure 10 of the description, and was squeezed before The contracted push spring 15 rebounds to push the push rod 11 to slide to the left, and pulls the limit component to fix the pressure difference push plate 7. The limit insert 21 and the connecting rod 20 are fixed in the limit chute 19 and connected with the limit When the pressure difference push plate 7 slides down and pushes the push rod 11 to slowly slide back into the connecting hole 9 to the left, the limit plug 21 is also driven to slide to one side of the limit slot 22. When the first push rod 12 slides to the other side of the second push rod 13 and is pushed by the pushing spring 15 to the other side of the pushing slot 10 , the limiting insert block 21 is pulled by the pushing rod 11 and inserted into the limiting slot 22 inside, and then complete the fixation of the pressure difference push plate 7, so that the pressure difference push plate 7 cannot move up and down, so that the closing plate 8 can firmly seal the oil storage tank 3. At this time, the closing plate 8 follows the direction of the previous pressure difference push plate 7. The downward movement has been completely inserted into the closed tank 2 and the oil storage tank 3 is closed. The limit assembly fixes the pressure difference push plate 7 and the crude oil in the oil storage tank 3 will no longer flow to the outside, thereby sealing the crude oil stored in the oil storage tank 3. The crude oil stored in this oil storage tank 3 is the crude oil at the depth of the oil production pipe 1 when the sealing plate 8 is closed. When the oil production pipe 1 is pulled back to the wellhead, the water pressure drops, and the pressure difference push plate 7 is stuck by the limit component. It will no longer move, so that the crude oil in the oil storage tank 3 will not flow out of the oil storage tank 3 as the water pressure decreases. By adjusting the air pressure in the air pressure tank 6 before oil production, the air pressure in the air pressure tank 6 at different pressures will be stepped up. In the oil production pipe 1 After slowly penetrating into the oil layer, the oil production pipe 1 squeezes the sealing plate 8 according to the water pressure at different depths to close the oil storage tank 3 at different depths, so that the oil production pipe 1 can collect and sample crude oil from oil layers at different depths at one time.

Specifically, please refer to FIGS. 1 to 11 . A second bevel 37 is formed on one end of the limiting plug 21 .

In this embodiment: the second bevel 37 is provided on one side of the limit insert block 21, and the limit slot 22 side is a bevel. When the limit insert block 21 is pulled by the push rod 11, it is in contact with the bevel of the limit slot 22. When the inner walls are in contact, the pulling force of the push rod 11 on the limit insert block 21 causes the second bevel 37 to squeeze the limit slot 22 to push the pressure difference push plate 7 down a certain distance until the limit insert block 21 is fully inserted into the limit block. In the slot 22, as the pressure difference push plate 7 slides down, the sealing plate 8 is driven to be completely inserted into the sealing groove 2 to close the oil storage tank 3.

Specifically, please refer to FIGS. 1 to 11 . One side end of the first push rod 12 is fixedly connected to a limiting ring 16 , and the diameter of the limiting ring 16 is larger than the side end opening of the spring groove 14 .

In this embodiment: the limit ring 16 is set on the outer surface of one end of the first push rod 12, and the sliding of the first push rod 12 is limited by the limit ring 16. When the push spring 15 pushes the first push rod 12 Until the limit ring 16 blocks the opening of the spring groove 14, the push rod 11 no longer slides, preventing the first push rod 12 from sliding out of the spring groove 14.

Specifically, please refer to Figures 1 to 11. Push grooves 23 are provided on one side of the inner wall of the push grooves 10, and push plates 24 are fixedly connected to one end of the push rods 11. The push plates are 24 slide in the plurality of pressing grooves 23 respectively.

In this embodiment: when crude oil is not poured into the differential pressure push plate 7, the push plate 24 is pushed by the spring 15 against the inner wall of one side of the push groove 23, and when the push rod 11 is pushed toward the push groove by the push spring 15 When the other side of 10 slides, the pressing plate 24 slides to the other side of the pressing groove 23. After the oil production pipe 1 is pulled out of the wellhead, the operator can press the pressing plate 24 from the outside to drive the push rod 11 to slide back to its original position. position and push the limit plug 21 out of the limit slot 22 to release the fixed restriction on the pressure difference push plate 7. The air pressure in the air pressure slot 6 compressed by the pressure difference push plate 7 pushes the pressure difference push plate 7 upward until it is closed. The plate 8 resists the upper inner wall of the closed tank 2, thereby opening the oil storage tank 3, and pouring the crude oil in the oil storage tank 3 from the oil inlet 4 to complete sampling.

Specifically, please refer to Figures 1 to 11. The plurality of pressing grooves 23 are provided with closing grooves 25 on the side inner walls thereof. The plurality of closing grooves 25 are slidably connected with closing plates 26. The side ends of the plurality of closing plates 26 are provided with There are friction blocks 27.

In this embodiment: the closing plate 26 slides in the closing groove 25 to seal the pressing groove 23 to prevent the water pressure from the pressing plate 24 from affecting the downward pressure of the differential pressure push plate 7. When it is necessary to take out the sampled oil, the closing plate 26 will be closed. The plate 26 slides upward and presses the push plate 24 from the outside to push the push rod 11 back to the original position to take out the sampled oil. The friction block 27 is provided on the surface of the closing plate 26. When the oil adheres to the outside of the oil production pipe 1, the friction block 27 increases the friction. .

Specifically, please refer to Figures 1 to 11. Valve cores 28 are provided in the plurality of air pressure grooves 6.

In this embodiment: the valve core 28 is disposed in the oil production pipe 1 to supercharge the air supply in the air pressure tank 6. The air pressure pipe is connected to the valve core 28 to adjust the air pressure in multiple air pressure tanks 6 so that each air pressure tank is closed. The plate 8 can be closed to seal the crude oil when it reaches different depths in the oil well.

Please refer to Figures 1 to 11 for details. An oil production base 29 is provided on the upper side of the oil production pipe 1. A runner 30 is rotatably connected to the upper end of the oil production base 29. A motor holder 31 is fixedly connected to the side end of the oil production base 29. The motor is fixed. A driving motor 32 is fixedly connected to the seat 31 , and the output end of the driving motor 32 is connected to the runner 30 .

In this embodiment: the oil production base 29 is fixed at the wellhead of the oil well, the runner 30 rotates on the upper end of the oil production base 29 through the rotating shaft, and the motor holder 31 is fixed on one side of the oil production base 29 to support the driving motor 32 and the output of the driving motor 32 The end is connected to the rotating shaft of the runner 30, and the driving motor 32 is started to drive the runner 30 to rotate to make the oil production pipe 1 go deep into the oil well or to pull the oil production pipe 1 back to the wellhead.

Specifically, please refer to Figures 1 to 11. A pull rope 33 is fixedly connected to the circumferential surface of the runner 30. A pull block 34 is fixedly connected to the lower end of the pull rope 33. A threaded groove 35 is provided at the lower end of the pull block 34. The oil production pipe 1 A threaded rod 36 is fixedly connected to the upper end, and the threaded rod 36 is threadedly connected to the threaded groove 35 .

In this embodiment, the pull rope 33 is provided on the surface of the runner 30 for pulling the oil production pipe 1. The oil production pipe 1 and the pull rope 33 are connected through the pulling block 34 and the threaded rod 36. When crude oil sampling is required, the oil production pipe 1 can be rotated. Screw the threaded rod 36 into the threaded groove 35 to complete the fixation of the oil production pipe 1, and then put the oil production pipe 1 into the oil well for sampling.

Specifically, please refer to Figures 1 to 11. The lower end of the oil production base 29 is provided with a third bevel 38.

In this embodiment: the third bevel 38 is provided at the lower end of the oil production base 29 to prevent the lower end of the oil production base 29 from being stuck when the oil production pipe 1 is pulled up.

It should be noted that the valve core 28 and the drive motor 32 used in this device are existing technologies and will not be described in detail here.

The working principle and usage process of the present invention: when it is necessary to collect crude oil from oil layers of different depths, the oil production pipe 1 is put into the oil well and slowly falls. The oil is poured into the oil storage tank 3 from the oil inlet 4. As the oil production pipe 1 moves As the water pressure continues to drop, it also increases. What resists the pressure difference push plate 7 and the closing plate 8 is the air pressure in the air pressure tank 6 and the thrust of the push spring 15 pushing the push rod 11 against the first bevel 17. When the pressure difference After the water pressure at the upper end of the push plate 7 is greater than the sum of the air pressure and thrust in the air pressure tank 6, the water pressure will push the pressure difference push plate 7 to slide toward the lower end of the water pressure tank 5 and the air pressure tank 6, and squeeze through the first bevel 17 Press one side of the push rod 11 to push the push rod 11 to slide toward the left end of the push groove 10. At this time, the angle between the first push rod 12, the second push rod 13 and the push rod 11 gradually becomes vertical, and the first push rod 12 and the second push rod 13 gradually become vertical. The distance between the push rod 12 and the second push rod 13 continues to shrink and the push spring 15 is squeezed to further shrink. As the water pressure gradually increases, when the first bevel 17 completely pushes the push rod 11 into the connecting hole 9, this When the first push rod 12 slides to the left side of the second push rod 13 in Figure 10 of the description, the push spring 15 that was previously squeezed and contracted rebounds to push the push rod 11 to slide to the left, and pulls the limiting insert 21 Insert into the limit slot 22 to fix the pressure difference push plate 7. At this time, the closing plate 8 has been completely inserted into the closing groove 2 and the oil storage tank 3 is closed with the downward movement of the pressure difference push plate 7. The limit assembly will After the pressure difference push plate 7 is fixed, the crude oil in the oil storage tank 3 will no longer circulate with the outside, thereby sealing the crude oil stored in the oil storage tank 3, so that the crude oil stored in this oil storage tank 3 is the oil production pipe 1 when the sealing plate 8 is closed. For the crude oil at the depth, when the oil production pipe 1 is pulled back to the wellhead, the water pressure drops, and the pressure difference push plate 7 is stuck by the limit component and will not move anymore, so that the crude oil in the oil storage tank 3 will not flow out as the water pressure decreases. In the oil storage tank 3, the air pressure in the air pressure tank 6 is adjusted before oil production, so that the air pressure in the different air pressure tanks 6 is stepped up. After the oil production pipe 1 slowly penetrates into the oil layer, it is squeezed and sealed according to the water pressure at different depths of the oil production pipe 1. The plate 8 closes the oil storage tank 3 at different depths respectively, so that the oil production pipe 1 can collect and sample crude oil from oil layers at different depths at one time.

Finally, it should be noted that the above 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, those skilled in the art can still The technical solutions described in the foregoing embodiments may be modified, or some of the technical features may be equivalently replaced. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims (9)

1. Well head full liquid sampling device, its characterized in that: comprising the following steps:

a production pipe (1);

the pressure boosting assembly is provided with a plurality of groups, each group of pressure boosting assembly comprises a closed groove (2), an oil storage groove (3), an oil inlet (4), a water pressure groove (5), an air pressure groove (6), a differential pressure pushing plate (7), a sealing plate (8) and a first bevel angle (17), the oil inlet (4) is formed in the circumferential surface of the oil extraction pipe (1), the closed groove (2) is formed in the oil extraction pipe (1) and is communicated with the oil inlet (4), the oil storage groove (3) is formed in the lower inner wall of the closed groove (2), the water pressure groove (5) is formed in the lower inner wall of the oil storage groove (3), the air pressure groove (6) is formed in the lower inner wall of the water pressure groove (5), the differential pressure pushing plate (7) is slidably connected in the water pressure groove (5), the sealing plate (8) is fixedly connected to the upper end of the differential pressure pushing plate (7) and is matched with the closed groove (2), and the first bevel angle (17) is formed in the two side ends of the differential pressure pushing plate (7);

the pushing assembly is provided with a plurality of groups, each group of pushing assembly comprises a connecting hole (9), a pushing groove (10), a pushing rod (11), a first pushing rod (12), a second pushing rod (13), a spring groove (14) and a pushing spring (15), the first pushing rod (12), the second pushing rod (13), the spring groove (14) and the pushing spring (15) are respectively provided with two pushing springs, the connecting hole (9) is formed in one side inner wall of the water pressure groove (5), the pushing groove (10) is formed in one side inner wall of the connecting hole (9), the pushing rod (11) is connected in the connecting hole (9) in a sliding mode, one side end of the pushing rod (11) is in contact with a first oblique angle (17), the two second pushing rods (13) are respectively connected to two side inner walls of the pushing groove (10) through rotating shafts, the two spring grooves (14) are respectively formed in one side ends of the two second pushing rods (13), the two first pushing rods (12) are respectively connected to two side inner walls of the two springs (14) through rotating shafts in the two side ends of the pushing rod (11) respectively, and the two first pushing rods are respectively connected to one side inner walls of the two springs (14) respectively;

the limiting assembly is provided with a plurality of groups, each group of limiting assembly comprises a connecting groove (18), a limiting sliding groove (19), a connecting rod (20), a limiting inserting block (21) and a limiting inserting groove (22), one side end of the differential pressure push plate (7) is arranged at the connecting groove (18), the limiting sliding groove (19) is arranged at one side inner wall of the connecting groove (18), the connecting rod (20) is fixedly connected with one side end of the first bevel angle (17) and slides in the connecting groove (18), the limiting inserting groove (22) is arranged at one side inner wall of the limiting sliding groove (19), and the limiting inserting block (21) is fixedly connected with the upper end of the connecting rod (20) and is matched with the limiting inserting groove (22).

2. The wellhead fluid sampling device of claim 1, wherein: one side end of the limiting plug block (21) is provided with a second bevel angle (37).

3. The wellhead fluid sampling device of claim 2, wherein: one side end of the first push rod (12) is fixedly connected with a limiting ring (16), and the diameter of the limiting ring (16) is larger than the opening of the side end of the spring groove (14).

4. A wellhead fluid sampling device according to claim 3, characterised in that: a plurality of pushing grooves (23) are formed in the inner wall of one side of each pushing groove (10), a plurality of pushing plates (24) are fixedly connected to one side end of each pushing rod (11), and the pushing plates (24) slide in the pushing grooves (23) respectively.

5. The wellhead fluid sampling device of claim 4, wherein: the side inner walls of the pressing grooves (23) are provided with closing grooves (25), the closing grooves (25) are internally and slidably connected with closing plates (26), and the side ends of the closing plates (26) are provided with friction blocks (27).

6. The wellhead fluid sampling device of claim 5, wherein: and valve cores (28) are arranged in the air pressure grooves (6).

7. The wellhead fluid sampling device of claim 6, wherein: the oil extraction base (29) is arranged on the upper side of the oil extraction pipe (1), the rotating wheel (30) is rotatably connected to the upper end of the oil extraction base (29), the motor fixing seat (31) is fixedly connected to the side end of the oil extraction base (29), the driving motor (32) is fixedly connected to the inside of the motor fixing seat (31), and the output end of the driving motor (32) is connected with the rotating wheel (30).

8. The wellhead fluid sampling device of claim 7, wherein: the circumference surface fixedly connected with stay cord (33) of runner (30), the lower extreme fixedly connected with pulling block (34) of stay cord (33), thread groove (35) have been seted up to the lower extreme of pulling block (34), the upper end fixedly connected with threaded rod (36) of production string (1), threaded rod (36) and thread groove (35) threaded connection.

9. The wellhead fluid sampling device of claim 8, wherein: the lower end of the oil extraction base (29) is provided with a third bevel angle (38).