Multifunctional sampler for oil field

Abstract

The invention relates to the technical field of oil field sampling, in particular to a multifunctional sampler for an oil field, which is integrated by an upper half part and a lower half part, the upper half portion comprises an umbrella-shaped step sliding sleeve, a switch control rod is installed at the lower end of the umbrella-shaped step sliding sleeve in a matched mode, the switch control rod is installed in an upper outer cylinder and a lower outer cylinder in a vertically movable mode, an upper return spring matched with the switch control rod is arranged in the upper outer cylinder, and the lower outer cylinder is provided with a liquid inlet groove and a locking block. And the lower half part comprises an upper joint and a lower joint which are respectively arranged at the upper end and the lower end of the sampler outer cylinder. The sampler not only has three closing modes of inertia closing, hammering closing and impact closing, but also can help an operator to judge whether the sampler is closed or not on the ground, so that the use reliability of the sampler when samples are obtained from different types of wells is improved, repeated construction is avoided, the construction time is shortened, and the production cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of oilfield sampling, in particular to a multifunctional sampler for oilfields. Background Art

[0002] The information disclosed in the background of the invention is only intended to enhance the understanding of the overall background of the invention and should not be necessarily regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art.

[0003] When taking samples from ordinary oil and water wells and ultra-high temperature steam injection wells in oil fields, the sampler is suspended by a steel cable on a winch and lowered to a predetermined position underground to obtain underground liquid samples. Currently, there are six main types of samplers: hammer type, clock-controlled type, electronic type, lifting and hanging type, release bomb gas push type, and pier impact type. All of these control methods have certain disadvantages.

[0004] Hammer type: Use the heavy hammer in the upper blowout plug of the wellhead blowout device to slide down along the steel wire cable connected to the sampler to the top of the sampler, and hit the controller to close the sampler sample barrel. This method can be applied to ordinary oil and water wells and high-temperature steam injection wells to obtain samples at any depth. The disadvantage is that the operator cannot determine whether the sample barrel is closed on the ground.

[0005] Clock-controlled type: The mechanical clock inside the sampler is used to control the closing of the sampler barrel. It can be applied to ordinary oil and water wells to obtain samples of any depth. The disadvantage is that it is not suitable for sampling high-temperature steam injection wells, and the operator on the ground cannot determine whether the sample barrel is closed.

[0006] Electronic type: The electronic clock in the sampler is used to control the motor to close the sampler sample barrel. It can be applied to ordinary oil and water wells to obtain samples at any depth. The disadvantage is that it is not suitable for sampling high-temperature steam injection wells, and the operator on the ground cannot determine whether the sample barrel is closed.

[0007] Lifting and hanging type: using the cam on the upper part of the sampler and the one-way tongue on the cam, when the sampler is lowered to the sampling position, the sampler is pulled up, and when the one-way tongue on the cam is hung on the gap in the coupling connecting the two pipe strings downhole, the cam rotates until the sampler sample barrel is closed. This method can be applied to ordinary oil and water wells and ultra-high temperature steam injection wells to obtain samples at any depth. The disadvantage is that the operator cannot determine whether the sample barrel is closed on the ground.

[0008] Release bomb gas push type: use electronic clock to control the gas generated by the explosion of electric detonator to push the sampler sample tube to close. It can be applied to ordinary oil and water wells to obtain samples of any depth. The disadvantage is: it is not suitable for high-temperature steam injection well sampling, and the operator on the ground cannot determine whether the sample tube is closed.

[0009] Punching type: using the lower part of the sampler to punch the bottom hole tool to close the sampler sample tube, which can be applied to ordinary oil and water wells. The disadvantages are: only bottom hole samples can be obtained, and samples at any depth cannot be obtained. It is not suitable for high-temperature steam injection well sampling, and the operator cannot determine whether the sample tube is closed on the ground.

[0010] The sampler of the above control method has a single function and is affected by high temperature. Except for the two control methods of hammering and hanging, the other four methods of clock control, electronic control, release elastic gas push and pier impact are not suitable for dryness sampling in ultra-high temperature steam injection wells.

[0011] At present, the safety department prohibits operators from climbing the wellhead to release the heavy hammer for blowout release operation. A self-lifting blowout preventer must be used. The sampler needs to be placed in the blowout preventer when it is in a horizontal state, and then hydraulically lifted to stand upright. In this way, the sampler will move up and down in the blowout preventer and touch the controller, causing the sample barrel to close. It must be readjusted and installed repeatedly, and its reliability is poor. Operators on the ground cannot judge whether the sample barrel of the downhole sampler is closed. They can only know whether it is closed after waiting for the sampler to be pulled out of the wellhead. If the sample barrel is not closed underground and there is no remedial measure, it will cause repeated construction and affect oil field production.

[0012] In addition, there are the following patents in the prior art:

[0013] CN110513108A, an oil field downhole sampler, uses connecting bolts, cables and servo motors to connect multiple devices together through connecting bolts and connecting holes. The servo motor stretches the cable to make the device located at different depths in the oil field, thereby performing stratified sampling of crude oil at different depths, avoiding repeatedly inserting the device into different depths in the oil field for sampling again after sampling is completed.

[0014] CN114778206A, an oilfield sampler used for oilfield exploration, can filter the drilling fluid collected by the sampling barrel to avoid blockage of the feed joint through the filter structure on the side of the filter cover, and use the first plug body, the second plug body and the third plug body to enable the sampling barrel to complete the sampling operation of the drilling fluid at the upper, middle and lower layers in one diving process.

[0015] CN114961718A, an oilfield downhole sampler with good sealing performance, comprises a shell, the interior of the shell is divided into a power chamber, a second collection chamber, a sliding chamber and a first collection chamber by a first partition, a second partition and a third partition, a transmission mechanism for providing power for collecting samples is arranged in the sliding chamber, a second piston slides in a connecting hole to reduce the air pressure in the first collection chamber, an external oilfield sample enters the first collection chamber, a rubber ball is reset to prevent the oilfield sample in the first collection chamber from leaking out, after the first feed pipe corresponds to the position of the strip hole, the external oilfield sample enters the second collection chamber, after the position of the second feed pipe corresponds to the second feed hole, a control valve is adjusted to allow the oilfield sample to enter the third collection chamber, so that the oilfield downhole sampler can perform three oilfield sampling operations after one trip down the well, thereby improving the sampling efficiency and reducing the leakage of the oilfield sample. Summary of the invention

[0016] In order to solve the above technical problems, the present invention provides a multifunctional sampler for oil fields, which not only has three closing methods: inertial closing, hammer closing, and impact closing, but also can help operators determine whether the sampler is closed on the ground, thereby improving the reliability of the sampler when obtaining samples in different types of wells.

[0017] To achieve the above object, the technical solution adopted by the present invention is:

[0018] A multifunctional sampler for oil fields, which is integrated with an upper part and a lower part;

[0019] The upper part includes an umbrella-shaped step sliding sleeve with a switch control rod mounted on the lower end thereof. The switch control rod is mounted in the upper outer tube and the lower outer tube so as to be movable up and down. The upper outer tube is provided with an upper return spring that matches the switch control rod. The lower outer tube is provided with a liquid inlet groove and a locking block.

[0020] The lower half includes an upper joint and a lower joint installed at the upper and lower ends of the sampler outer tube, respectively; the lower end of the upper joint is installed with a first valve matched in the sampler outer tube, an adjustable control sleeve is arranged above the first valve, and a sampler inner tube is arranged below, and a central transmission control connecting rod matched with the first valve is arranged in the sampler inner tube; the upper end of the lower joint has a second valve inside, and the lower end is connected to the liquid inlet joint;

[0021] The locking block is associated with the switch control rod and the adjustable control sleeve to cooperate with each other to realize the opening and closing of the sampler.

[0022] Furthermore, the upper half and the lower half are connected by a lower outer tube and an upper joint;

[0023] The top of the umbrella-shaped step sliding sleeve is provided with a wire threading hole penetrating downward, a supporting spring and a disassembly-free rope cap are installed in sequence in the umbrella-shaped step sliding sleeve, the disassembly-free rope cap body is provided with a rope knot hole penetrating horizontally, a longitudinal groove is opened from the center of the top of the disassembly-free rope cap body to the rope knot hole, the switch control rod is installed at the lower part of the disassembly-free rope cap, a connecting wire sleeve is sleeved on the switch control rod and connected to the lower end of the umbrella-shaped step sliding sleeve, a return spring is sleeved on the outside of the switch control rod, a positioning pin fixed to the outside of the switch control rod is provided above the return spring, and a pressure cap with a longitudinal keyway is installed at the upper end of the upper outer cylinder.

[0024] Furthermore, threads are provided inside the two ends of the lower outer tube, and locking block movable grooves for matching the locking block are symmetrically provided on both sides of the middle of the lower outer tube;

[0025] The upper part of the locking block is provided with a cutting surface that cooperates with the switch control rod and a locking block mounting hole that is hinged and fixed with a pin, the middle part is provided with a spring positioning hole and a spring fixing hole that cooperate with the installation of a release spring, and the lower part is provided with an external positioning claw and a locking head that can be closed together.

[0026] Furthermore, a bell-mouthed sleeve is provided at the lower portion of the first valve, a first rotatable spiral impeller is installed at the upper portion of the bell-mouthed sleeve body, the first valve is conical, a first sealing ring is installed at the conical portion, a first adjusting screw is provided at the upper portion of the first valve, an upper joint, a first return spring, a first return spring adjusting nut and an adjustable control sleeve are installed on the first adjusting screw in sequence, and a gap is provided between the first valve and the upper joint under compression of the first return spring for fluid to pass through.

[0027] Furthermore, the center of the upper joint is a through hole, and a conical sealing surface matching the first valve cone surface is provided inside the lower end of the upper joint, and the sampler outer tube, the lower joint and the liquid inlet joint are installed in sequence at the lower part of the upper joint.

[0028] Furthermore, a locking base is installed in the outer tube of the sampler, and the locking base body is provided with an external thread for connecting the inner wall of the outer tube of the sampler and the sampling inner tube. A threaded hole is provided through the center of the locking base body, and a locking sleeve with multiple longitudinal cutting seams is installed on the upper end of the threaded hole.

[0029] Furthermore, a central tube is installed in the sampling inner cylinder for the central transmission control connecting rod to pass through, and a liquid inlet annular cavity is provided between the central tube and the inner wall of the sampling inner cylinder;

[0030] A plurality of penetrating injection holes are arranged around the central threaded hole of the locking base body, and the injection holes are communicated with the liquid inlet annular cavity.

[0031] The upper end of the central transmission control connecting rod is in the shape of a date pit, and the upper end of the central transmission control connecting rod passes through the central tube inside the sampling inner cylinder and is located in the locking sleeve above the locking base.

[0032] Furthermore, a second spiral impeller is sleeved between the central transmission control connecting rod and the second valve, the second valve at the lower part of the second spiral impeller is a conical part, and a second sealing ring is installed at the conical part. Under the compression of the first return spring, the second valve has a gap between it and the lower joint for fluid to pass through.

[0033] Further, the second adjusting screw under the second valve is sequentially installed with a lower joint, the center of the lower joint is a through hole, and the upper end of the lower joint is provided with a conical sealing surface matching the conical surface of the second valve, a second return spring and a second spring adjusting nut;

[0034] Furthermore, a liquid inlet joint is connected to the lower end of the lower joint, and a liquid inlet hole is provided on the liquid inlet joint body.

[0035] Beneficial effects: The invention has reasonable structure, high sampling success rate, low failure rate and reliable use, etc., avoiding repeated construction, reducing construction time and reducing production costs. The invention can be used not only for downhole dryness sampling of ultra-high temperature steam injection wells, but also for downhole sampling of ordinary oil and water wells. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the upper part structure of the present invention;

[0037] Figure 2 It is a schematic diagram of the structure of the lower half of the present invention;

[0038] Figure 3 It is a schematic diagram of the structure of the inner cylinder part of the sampler of the present invention;

[0039] Figure 4 It is a schematic diagram of the external structure of the non-disassembly rope cap part of the present invention;

[0040] Figure 5 It is a schematic diagram of the internal structure of the non-disassembly rope cap part of the present invention;

[0041] Figure 6 It is a schematic diagram of the partial structure of the locking block of the present invention.

[0042] The reference numerals in the drawings indicate the following:

[0043] 1. Umbrella-shaped step sliding sleeve; 2. Wire threading hole; 3. Support spring; 4. Non-disassembly rope cap; 5. Groove; 6. Rope knot hole; 7. Connecting wire sleeve; 8. Switch control lever; 9. Positioning pin; 10. Pressure cap with longitudinal keyway; 11. Upper outer cylinder; 12. Upper return spring; 13. Lower outer cylinder; 14. Pin; 15. Spring fixing hole; 16. Release spring; 17. Locking block; 17-1. Cutting surface; 17-2. Locking block mounting hole; 17-3. Spring fixing hole; 17-4. External positioning claw; 17-5. Locking head; 18. Locking block movable groove; 19. Liquid inlet groove; 20. Adjustable control sleeve; 21. First return spring adjusting nut; 22. Upper joint; 23. First return Spring; 24, first adjusting screw; 25, first sealing ring; 26, first valve; 27, first spiral impeller; 28, bell-mouth sleeve; 29, cutting seam; 30, locking sleeve; 31, upper end of central transmission control connecting rod; 32, locking sleeve mounting hole; 33, injection hole; 34, locking base; 35, sampler inner tube; 35-1, center tube; 35-2, liquid inlet annular cavity; 36, sampler outer tube; 37, central transmission control connecting rod; 38, second spiral impeller; 39, second valve; 40, second sealing ring; 41, second return spring; 42, second adjusting screw; 43, lower joint; 44, second spring adjusting nut; 45, liquid inlet joint; 46, liquid inlet hole. DETAILED DESCRIPTION

[0044] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0045] Figures 1 to 6 A multifunctional sampler for oil fields is presented, which is integrally formed of an upper part and a lower part;

[0046] The upper part includes an umbrella-shaped step sliding sleeve 1, the lower end of which is matched with a switch control rod 8, and the switch control rod 8 is movably mounted in an upper outer tube 11 and a lower outer tube 13, and an upper return spring 12 matching the switch control rod 8 is arranged in the upper outer tube 11, and a liquid inlet groove 19 and a locking block 17 are arranged in the lower outer tube 13;

[0047] The lower half includes an upper joint 22 and a lower joint 43 installed at the upper and lower ends of the sampler outer tube 36, respectively. The lower end of the upper joint 22 is installed with a first valve 26 matched in the sampler outer tube 36, an adjustable control sleeve 20 is arranged above the first valve 26, and a sampler inner tube 35 is arranged below, and a central transmission control connecting rod 37 matched with the first valve 26 is arranged in the sampler inner tube 35; the upper end of the lower joint 43 has a second valve 39 inside, and the lower end is connected to the liquid inlet joint 45;

[0048] The locking block 17 is associated with the switch control rod 8 and the adjustable control sleeve 20 to cooperate with each other to realize the opening and closing of the sampler.

[0049] In another preferred embodiment, the upper half and the lower half are connected by the lower outer tube 13 and the upper joint 22;

[0050] The top of the umbrella-shaped step sleeve 1 is provided with a wire hole 2 penetrating downward, and a support spring 3 and a disassembly-free rope cap 4 are installed in sequence in the umbrella-shaped step sleeve 1. The body of the disassembly-free rope cap 4 is provided with a rope knot hole 6 penetrating horizontally, and a longitudinal groove 5 is opened from the center of the top of the body of the disassembly-free rope cap 4 to the rope knot hole 6. The switch control rod 8 is installed at the lower part of the disassembly-free rope cap 4, and a connecting wire sleeve 7 is sleeved on the switch control rod 8 and connected to the lower end of the umbrella-shaped step sleeve 1. A return spring is sleeved on the outside of the switch control rod 8, and a positioning pin 9 fixed to the outside of the switch control rod 8 is provided above the return spring. A pressure cap 10 with a longitudinal keyway is installed at the upper end of the upper outer cylinder 11.

[0051] In another preferred embodiment, both ends of the lower outer cylinder 13 are internally threaded, and both sides of the middle of the lower outer cylinder 13 are symmetrically provided with movable grooves of the locking block 17 for matching the locking block 17;

[0052] The upper part of the locking block 17 is provided with a cutting surface 17-1 cooperating with the switch control rod 8 and a locking block mounting hole 17-2 hingedly fixed with the pin 14, the middle part is provided with a spring positioning hole 15 and a spring fixing hole 17-3 cooperating with the installation of the release spring 16, and the lower part is provided with an external positioning claw 17-4 and a locking head 17-5 that can be closed together.

[0053] In another preferred embodiment, a bell-mouth sleeve 28 is provided at the lower portion of the first valve 26, a first rotatable spiral impeller 27 is installed at the upper portion of the bell-mouth sleeve 28 body, the first valve 26 is conical, a first sealing ring 25 is installed at the conical portion, a first adjusting screw 24 is provided at the upper portion of the first valve 26, an upper joint 22, a first return spring 23, a first return spring 23 adjusting nut 21 and an adjustable control sleeve 20 are installed on the first adjusting screw 24 in sequence, and a gap is provided between the first valve 26 and the upper joint 22 under compression of the first return spring 23 for fluid to pass through.

[0054] In another preferred embodiment, the center of the upper joint 22 is a through hole, and a conical sealing surface matching the conical surface of the first valve 26 is provided inside the lower end of the upper joint 22, and the sampler outer tube 36, the lower joint 43 and the liquid inlet joint 45 are installed in sequence at the lower part of the upper joint 22.

[0055] In another preferred embodiment, a locking base 34 is installed in the sampler outer tube 36, and the locking base 34 body is provided with an external thread for connecting the inner wall of the sampler outer tube 36 and the sampling inner tube, and the center of the locking base 34 body is provided with a threaded hole penetrating therethrough, and a locking sleeve 30 with multiple longitudinal cutting seams 29 is installed at the upper end of the threaded hole.

[0056] In another preferred embodiment, a central tube 35-1 is installed in the sampling inner tube for the central transmission control connecting rod 37 to pass through, and a liquid inlet annular cavity 35-2 is provided between the central tube 35-1 and the inner wall of the sampling inner tube;

[0057] A plurality of through-holes 33 are arranged around the central threaded hole of the locking base 34 body, and the injection holes 33 are communicated with the liquid inlet annular cavity 35 - 2 .

[0058] The upper end portion 31 of the central transmission control connecting rod is in the shape of a date pit. The upper end portion 31 of the central transmission control connecting rod passes through the central tube 35 - 1 inside the sampling inner cylinder and is located in the locking sleeve 30 above the locking base 34 .

[0059] In another preferred embodiment, a second spiral impeller 38 is sleeved between the central transmission control connecting rod 37 and the second valve 39, the second valve 39 at the lower part of the second spiral impeller 38 is a conical portion, and a second sealing ring 40 is installed at the conical portion. Under the compression of the first return spring 23, the second valve 39 has a gap between the lower joint 43 for fluid to pass through.

[0060] In another preferred embodiment, the second adjusting screw 42 below the second valve 39 is sequentially mounted with a lower joint 43, the center of the lower joint 43 is a through hole, and the upper end of the lower joint 43 is provided with a conical sealing surface matching the conical surface of the second valve 39, a second return spring 41, and a second spring adjusting nut 44;

[0061] In another preferred embodiment, the lower end of the lower joint 43 is connected to a liquid inlet joint 45 , and a liquid inlet hole 46 is provided on the body of the liquid inlet joint 45 .

[0062] In another specific embodiment, a multifunctional sampler for oil fields is composed of an upper half and a lower half;

[0063] An umbrella-shaped step sleeve 11 is arranged at the upper part of the upper half, a wire threading hole 2 is arranged at the top of the umbrella-shaped step sleeve 1 and penetrates downward, a support spring 3 and a non-disassembly rope cap 4 are sequentially installed in the umbrella-shaped step sleeve 1, a rope knot hole 6 is horizontally penetrated in the body of the non-disassembly rope cap 4, a longitudinal groove 5 is opened from the center of the top of the body of the non-disassembly rope cap 4 to the rope knot hole 6, a switch control rod 8 is installed at the lower part of the non-disassembly rope cap 4, a connecting wire sleeve 7 is sleeved on the switch control rod 8 and screwed on the lower end of the umbrella-shaped step sleeve 1, a return spring is sleeved on the outside of the switch control rod 8, a positioning pin 9 is arranged above the return spring and fixed on the outside of the switch control rod 8, an upper outer cylinder 11 and a lower outer cylinder 13 are arranged on the outside of the switch control rod 8, and a pressure cap 10 with a longitudinal keyway is installed at the upper end of the upper outer cylinder 11;

[0064] The lower outer tube 13 has threads at both ends. The middle of the lower outer tube 13 has symmetrically opened movable grooves for locking blocks 17 on both sides. The two movable grooves for locking blocks 17 are respectively installed with locking blocks 17.

[0065] A spring positioning hole for fixing the release spring 16 is designed on the body of the lower outer cylinder 13, which is located between the spring fixing holes 17-3 of the two locking blocks 17; and an upright L-shaped liquid inlet groove 19 is symmetrically formed on the body of the lower outer cylinder 13;

[0066] The upper ends of the two locking blocks 17 have the same cutting surface 17-1 and locking block mounting hole 17-2. The two locking blocks 17 are fixed in the movable groove of the locking block 17 in the middle of the lower outer tube 13 by screwing the pin 14 into the pin 14 hole and the locking block mounting hole 17-2 on the upper part of the body;

[0067] The middle part of the locking block 17 body has a spring fixing hole 17-3 for installing the release spring 16 and the release spring 16, the outer side of the lower end of the locking block 17 body has a triangular outer positioning claw 17-4, and the locking head 17-5 at the lower end of the locking block 17 body can be closed;

[0068] A first valve 26 is provided at the upper part of the lower half, a bell-mouth sleeve 28 is provided at the lower part of the first valve 26, a rotatable first spiral impeller 27 is installed at the upper part of the bell-mouth sleeve 28 body, the first valve 26 is conical, a first sealing ring 25 is installed at the conical part, a gap is provided between the first valve 26 and the upper joint 22 under the compression of the first return spring 23, and a first adjusting screw 24 is provided at the upper part of the first valve 26, and an upper joint 22, a first return spring 23, an adjusting nut 21 of the first return spring 23, and an adjustable control sleeve 20 are installed in sequence on the first adjusting screw 24;

[0069] The center of the upper joint 22 is a through hole, and the lower end of the upper joint 22 has a conical sealing surface that matches the conical surface of the first valve 26. The sampler outer cylinder 36, the lower joint 43 and the liquid inlet joint 45 are screwed in sequence at the lower part of the upper joint 22; the sampler outer cylinder 36, the lower joint 43 and the liquid inlet joint 45 are screwed in sequence at the lower part of the upper joint 22; a locking base 34 is installed in the sampler outer cylinder 36, and the locking base 34 body has an external thread for connecting the inner wall of the sampler outer cylinder 36 and the upper end of the sampling inner cylinder. A threaded hole is provided through the center of the locking base 34 body as a locking sleeve mounting hole 32, and a locking sleeve 30 with multiple longitudinal cutting seams 29 is installed at the upper end of the threaded hole, and the sampler inner cylinder 35 is screwed at the lower end of the locking base 34 body;

[0070] The upper end of the sampling inner cylinder has an internal thread, and a central tube 35-1 is installed inside the sampling inner cylinder for the central transmission control connecting rod 37 to pass through. There is a liquid inlet annular cavity 35-2 between the central tube 35-1 and the inner wall of the sampling inner cylinder. The lower end of the sampling inner cylinder is closed except for the central tube 35-1. The internal thread of the upper end of the sampling inner cylinder is screwed into the thread at the lower end of the locking base 34.

[0071] A plurality of through-holes 33 are formed around the central threaded hole of the locking base 34 body, and the injection holes 33 are communicated with the liquid inlet annular cavity 35-2 between the inner wall of the sampling inner cylinder;

[0072] The upper end portion 31 of the central transmission control connecting rod is in the shape of a date pit. The upper end portion 31 of the central transmission control connecting rod is located in the locking sleeve 30 at the upper end of the locking base 34. The upper portion of the central transmission control connecting rod 37 is located in the central tube 35-1 inside the sampling inner cylinder.

[0073] A second spiral impeller 38 is sleeved between the central transmission control connecting rod 37 and the second valve 39. The second valve 39 at the lower part of the second spiral impeller 38 is conical, and a second sealing ring 40 is installed at the conical part. Under the compression of the first return spring 23, there is a gap between the second valve 39 and the lower joint 43 for fluid to pass through. The second adjusting screw 42 at the lower part of the second valve 39 is sequentially installed with the lower joint 43, the second return spring 41, and the second spring adjusting nut 44; the center of the lower joint 43 is a through hole, and the upper end of the lower joint 43 has a conical sealing surface that matches the conical surface of the second valve 39. A lower liquid inlet joint 45 is screwed at the lower part of the lower joint 43, and the liquid inlet joint 45 body has symmetrical liquid inlet holes 46;

[0074] The upper half and the lower half of the sampler are connected together through the lower outer cylinder 13 and the upper joint 22 .

[0075] Before using the device, first pull the switch control rod 8 together with the upper return spring 12 on the switch control rod 8 upwards. When the positioning pin 9 on the switch control rod 8 is pulled along the keyway to the upper part of the pressure cap 10 with the longitudinal keyway, it is rotated at a certain angle, and the positioning pin 9 is stuck on the upper end surface of the non-keyway part of the pressure cap 10 with the longitudinal keyway. At this time, the upper return spring 12 on the switch control rod 8 is in a compressed state. Due to the obstruction of the positioning pin 9, the switch control rod 8 will not go down due to the action of the upper return spring 12.

[0076] Then, the second return spring 41 at the lower part of the second adjusting screw 42 of the second valve 39 in the lower joint 43 is compressed, so that the central transmission control connecting rod 37 moves upward. When the jujube-shaped head of the upper end portion 31 of the central transmission control connecting rod located in the locking sleeve 30 is exposed from the locking sleeve 30, the adjustable control sleeve 20 is pressed down. The adjustable control sleeve 20 together with the first adjusting screw 24 and the first return spring adjusting nut 21 compress the first return spring 23, and the bell-mouth sleeve 28 at the lower part of the first valve 26 moves downward, so that the locking sleeve 30 enters the bell-mouth sleeve 28, and the two locking blocks 17 are retracted, so that the locking head 17-5 at the lower end is completely entered into the body of the lower outer tube 13, and the locking head 17-5 is pressed on the top of the adjustable control sleeve 20 and cannot move upward. At this time, there are gaps for fluid to pass between the first valve 26 and the upper joint 22, and between the second valve 39 and the lower joint 43.

[0077] Rotate the switch control rod 8 to lower the positioning pin 9 on the switch control rod 8 along the key slot until the lower end of the switch control rod 8 completely enters the cutting surface 17-1 position on the inner side of the upper ends of the two locking blocks 17. The two locking block cutting surfaces 17-1 are then spread apart by the switch control rod 8, and the locking head 17-5 at the lower end cannot be opened. At this time, the sampler enters a waiting-to-close state.

[0078] Remove the umbrella-shaped step sleeve 1, pass the steel wire through the steel wire hole 2 and the support spring 3 of the umbrella-shaped step sleeve 1 in sequence, and after the installation requirements are made, put the made rope knot head into the rope knot hole 6 that passes horizontally through the body of the non-removal rope cap 4, and put the steel wire on the upper part of the rope knot into the longitudinal groove 5 from the center of the top of the non-removal rope cap 4 body to the rope knot hole 6, and the umbrella-shaped step sleeve 1 is sleeved on the outside of the non-removal rope cap 4 body, and then connected with the connecting wire sleeve 7. The longitudinal groove 5 from the center of the top of the rope cap 4 body to the knot hole is in a straight line, and the gap between the umbrella-shaped step sleeve 1 and the non-disassembly rope cap 4 body is smaller than the diameter of the steel wire. Therefore, the steel wire knot cannot fall out. When replacing the second sampler for sampling, you only need to remove the umbrella-shaped step sleeve 1, take out the knot, and install it on the next sampler. There is no need to make a new knot, which effectively saves the construction preparation time. At this time, the sampler oil field is in an open state, and the preparation for the sampler to go down the well is completed.

[0079] When the inertial closing method is used: the rope cap of this multifunctional sampler for oil fields is connected to the steel wire on the ground winch drum, and lowered into the well where sampling is required. The steam in the well flows from the L-shaped liquid inlet groove 19, through the gap between the first valve 26 and the upper joint 22 to the first spiral impeller 27 on the bell sleeve 28. The first spiral impeller 27 rotates under the impact of the steam flow, and some water with a larger specific gravity is thrown to the inner wall of the outer cylinder of the sampler, and flows into the inner cylinder 35 of the sampler along the inner wall through the sampling hole 33. The remaining fluid enters the gap between the central tube and the central transmission control connecting rod, and flows out through the gap between the second valve and the lower joint. When the sampling depth and time are reached, the ground winch brake is quickly braked to achieve an emergency stop. At this time, the switch control rod, rope cap joint, umbrella-shaped step sliding sleeve, support spring, and connecting silk sleeve of the upper part stop moving, and other parts of the sampler continue to descend together. When the elastic force of the return spring is overcome, the switch control rod disengages from the cutting surface position at the upper ends of the two locking blocks, and the two locking blocks lose the obstruction of the switch control rod. The locking heads of the two locking blocks open outward under the action of the release spring. After the adjustable control sleeve loses the obstruction of the two locking heads, under the action of the first return spring, the adjustable control sleeve moves up quickly together with the first valve and the bell-mouth sleeve, so that the first valve enters the lower joint to achieve the closure of the first valve. At the same time, after the locking sleeve disengages from the center hole of the lower sleeve of the first valve, the jujube-shaped head at the top of the central transmission control connecting rod forces the locking sleeve to open under the action of the return spring. After losing the restraint of the locking sleeve, the central transmission control connecting rod moves down together with the second valve, so that the second valve enters the lower joint to achieve the closure of the lower valve and the sampling is completed.

[0080] When the hammer closing method is used: the rope cap of the multifunctional sampler for oil fields is connected to the steel wire on the ground winch drum, and lowered into the well where sampling is required. The steam in the well flows from the L-shaped liquid inlet groove, through the gap between the first valve and the upper joint, and reaches the impeller on the trumpet-shaped sleeve. The impeller rotates under the impact of the steam flow, and some water with a larger specific gravity is thrown to the inner wall of the sampler outer tube 36, and flows into the sampler inner tube 35 along the inner wall through the sampling hole 33. The remaining fluid enters the gap between the central tube 35-2 and the central transmission control connecting rod 37, and flows out through the gap between the second valve 39 and the lower joint 43. When the sampling depth and time are reached, a heavy hammer is released from the wellhead, and the heavy hammer slides down along the steel wire and hits the umbrella-shaped step sleeve 1 at the top of the multifunctional sampler for oil fields. After the umbrella-shaped step sleeve 1 overcomes the elastic force of the supporting spring 3, the connecting wire sleeve 7 at the lower end quickly hits the pressure cap 10 with a longitudinal key groove. At this time, the switch control rod 8 and the non-disassembly rope cap 4 joint of the upper part stop moving, and the other parts of the sampler continue to descend together. When the elastic force of the upper return spring 12 is overcome, the switch control rod 8 escapes from the cutting surface 17-1 position at the upper end of the two locking blocks 17, and the two locking blocks 17 lose the obstruction of the switch control rod 8. The locking heads 17-5 of the two locking blocks 17 open outwardly under the action of the release spring 16. After the adjustable control sleeve 20 loses the obstruction of the two locking heads 17, under the action of the first return spring 23, the adjustable control sleeve 20 together with the first valve 26 and the bell-mouth sleeve 28 quickly move upward, so that the first valve 26 enters the lower joint 43, and the first valve 26 is closed. At the same time, after the locking sleeve 30 escapes from the center hole of the lower sleeve of the first valve 26, the jujube-shaped head of the upper end portion 31 of the central transmission control connecting rod forces the locking sleeve 30 to open under the action of the first return spring 23. After losing the restraint of the locking sleeve 30, the central transmission control connecting rod 37 moves downward together with the second valve 39, so that the second valve 39 enters the lower joint 43, and the lower valve is closed.

[0081] When the impact top closing method is used: the rope cap of this multifunctional sampler for oil fields is connected to the steel wire on the ground winch drum, and when the sample to be obtained at the wellhead is lowered, the steam in the well flows from the L-shaped liquid inlet groove 19, through the gap between the first valve 26 and the upper joint 22 to the first spiral impeller 27 on the bell-mouth sleeve 28. The first spiral impeller 27 rotates under the impact of the steam flow, and throws part of the water with a larger specific gravity to the inner wall of the sampler outer tube 36, and flows into the sampler inner tube 35 along the inner wall through the sampling hole, and the remaining fluid enters the gap between the central tube 35-1 and the central transmission control connecting rod 37, and flows out through the gap between the second valve 39 and the lower joint 43. When the sampling time is reached, the steel wire connected to the sampler is pulled, and the top of the umbrella-shaped step sleeve 1 of the multifunctional sampler for oil fields hits the lower end of the anti-blowout plug. After the umbrella-shaped step sleeve 1 overcomes the elastic force of the supporting spring 3, the connecting wire sleeve 7 at the lower end quickly hits the pressure cap 10 with a longitudinal keyway. At this time, the switch control rod 8 and the non-disassembly rope cap 4 joints on the upper part stop moving, and the other parts of the sampler continue to descend together. When the elastic force of the upper return spring 12 is overcome, the switch control rod 8 escapes from the cutting surface 17-1 position at the upper end of the two locking blocks 17, and the two locking blocks 17 lose the obstruction of the switch control rod 8. The two locking blocks 17 immediately open outward under the action of the release spring 16. After the adjustable control sleeve 20 loses the obstruction of the two locking blocks 17, under the action of the first return spring 23, the adjustable control sleeve 20 together with the first valve 26 and the bell-mouth sleeve 28 quickly move up, so that the first valve 26 enters the first conical valve seat, and the first valve is closed. At the same time, the locking sleeve 30 escapes from the center hole of the lower sleeve of the first valve 26, and the jujube-shaped head of the upper end portion 31 of the central transmission control connecting rod is forced to open under the action of the first return spring 23. After losing the restraint of the locking sleeve 30, the central transmission control connecting rod 8 moves downward together with the second valve 39, so that the second valve 39 enters the second conical valve seat, and the lower valve is closed, and the sampling is completed.

[0082] Adjustment of the sampler when different samples need to be obtained: When a liquid sample needs to be obtained, the sampling inner cylinder at the lower end of the locking base 34 can be removed as needed to obtain other liquid samples;

[0083] Confirm whether the sample barrel of the above three control samplers is closed: In order to determine whether the sample barrel of the sampler is closed, the sampler needs to be lowered, and the outer 17-4 positioning claws at the lower ends of the two opened locking blocks 17 will slide down along the pipe wall. When entering the middle gap of the two pipe column joints at the pipe column coupling, the outer positioning claws 17-4 enter the middle gap of the two pipe column joints, and the sampler is forced to stop descending. It can be confirmed that the sampling barrel has been closed and can be started for operation. Otherwise, repeat the slight upward movement of the sampler, and then quickly brake the ground winch brake to achieve an emergency stop until the sampler can no longer descend, thereby achieving the purpose of confirming whether the sample barrel is closed on the ground.

[0084] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other.

[0085] The terms "upper", "lower", "outer side", "inner side", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish the relative relationship in position if they exist, and do not need to be qualitative. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0086] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multifunctional sampler for oil fields, characterized in that: It is made up of an upper and lower part; The upper part includes an umbrella-shaped step sliding sleeve with a switch control rod mounted on the lower end thereof. The switch control rod is mounted in the upper outer tube and the lower outer tube so as to be movable up and down. The upper outer tube is provided with an upper return spring that matches the switch control rod. The lower outer tube is provided with a liquid inlet groove and a locking block. The lower part includes an upper joint and a lower joint installed at the upper and lower ends of the sampler outer cylinder respectively, the lower end of the upper joint is installed with a first valve matched in the sampler outer cylinder, an adjustable control sleeve is arranged above the first valve, and a sampler inner cylinder is arranged below, and a central transmission control connecting rod matched with the first valve is arranged in the sampler inner cylinder; the upper end of the lower joint has a second valve inside, and the lower end is connected to the liquid inlet joint; the locking block is associated with the switch control rod and the adjustable control sleeve to cooperate to realize the opening and closing of the sampler.

2. The multifunctional sampler for oil fields according to claim 1, characterized in that: The upper part and the lower part are connected by a lower outer tube and an upper joint; The top of the umbrella-shaped step sliding sleeve is provided with a wire threading hole penetrating downward, a supporting spring and a disassembly-free rope cap are installed in sequence in the umbrella-shaped step sliding sleeve, the disassembly-free rope cap body is provided with a rope knot hole penetrating horizontally, a longitudinal groove is opened from the center of the top of the disassembly-free rope cap body to the rope knot hole, the switch control rod is installed at the lower part of the disassembly-free rope cap, a connecting wire sleeve is sleeved on the switch control rod and connected to the lower end of the umbrella-shaped step sliding sleeve, a return spring is sleeved on the outside of the switch control rod, a positioning pin fixed to the outside of the switch control rod is provided above the return spring, and a pressure cap with a longitudinal keyway is installed at the upper end of the upper outer cylinder.

3. The multifunctional sampler for oil fields according to claim 2, characterized in that: The two ends of the lower outer tube are internally provided with threads, and the two sides of the middle of the lower outer tube are symmetrically provided with locking block movable grooves for matching the locking block; The upper part of the locking block is provided with a cutting surface that cooperates with the switch control rod and a locking block mounting hole that is hinged and fixed with a pin, the middle part is provided with a spring positioning hole and a spring fixing hole that cooperate with the installation of a release spring, and the lower part is provided with an external positioning claw and a locking head that can be closed together.

4. The multifunctional sampler for oil fields according to claim 3, characterized in that: A bell-mouthed sleeve is provided at the lower part of the first valve, a first rotatable spiral impeller is installed at the upper part of the bell-mouthed sleeve body, the first valve is conical, a first sealing ring is installed at the conical part, a first adjusting screw is provided at the upper part of the first valve, an upper joint, a first return spring, a first return spring adjusting nut and an adjustable control sleeve are installed on the first adjusting screw in sequence, and a gap is provided between the first valve and the upper joint for fluid to pass through when the first return spring is compressed.

5. The multifunctional sampler for oil fields according to claim 4, characterized in that: The center of the upper joint is a through hole, and a conical sealing surface matching the first valve conical surface is provided inside the lower end of the upper joint. The sampler outer tube, the lower joint and the liquid inlet joint are sequentially installed at the lower part of the upper joint.

6. The multifunctional sampler for oil fields according to claim 5, characterized in that: A locking base is installed in the sampler outer tube, and the locking base body is provided with an external thread for connecting the inner wall of the sampler outer tube and the sampling inner tube. A threaded hole is penetrated through the center of the locking base body, and a locking sleeve with multiple longitudinal cutting seams is installed on the upper end of the threaded hole.

7. The multifunctional sampler for oil fields according to claim 6, characterized in that: A central tube is installed in the sampling inner cylinder for the central transmission control connecting rod to pass through, and a liquid inlet annular cavity is provided between the central tube and the inner wall of the sampling inner cylinder; A plurality of penetrating injection holes are arranged around the central threaded hole of the locking base body, and the injection holes are communicated with the liquid inlet annular cavity. The upper end of the central transmission control connecting rod is in the shape of a date pit, and the upper end of the central transmission control connecting rod passes through the central tube inside the sampling inner cylinder and is located in the locking sleeve above the locking base.

8. The multifunctional sampler for oil fields according to claim 7, characterized in that: A second spiral impeller is sleeved between the central transmission control connecting rod and the second valve. The second valve at the lower part of the second spiral impeller is a conical part. A second sealing ring is installed at the conical part. Under the compression of the first return spring, a gap is provided between the second valve and the lower joint for fluid to pass through.

9. The multifunctional sampler for oil fields according to claim 8, characterized in that: The second adjusting screw below the second valve is sequentially installed with a lower joint, the center of the lower joint is a through hole, and the upper end of the lower joint is internally provided with a conical sealing surface matching the conical surface of the second valve, a second return spring and a second spring adjusting nut.

10. The multifunctional sampler for oil fields according to claim 9, characterized in that: The lower end of the lower joint is connected with a liquid inlet joint, and a liquid inlet hole is arranged on the liquid inlet joint body.

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