Downhole steam injection collection tool and drilling collection equipment

Abstract

A downhole steam injection collection tool and drilling collection equipment in the field of oil and gas collection. The downhole steam injection collection tool comprises an outer cylinder (12) and a plunger apparatus arranged in the outer cylinder (12). The plunger apparatus comprises a plunger cylinder (2) forming a steam injection annulus with the outer cylinder (12). A steam injection hole (122) in communication with the steam injection annulus is provided in a lower part of the outer cylinder (12), and a vent hole in communication with the steam injection annulus is provided in an upper part of the plunger cylinder (2). The plunger apparatus comprises a traveling valve assembly arranged in the plunger cylinder (2). The traveling valve assembly is operable to axially move relative to the plunger cylinder (2) so as to open or close the traveling valve assembly, thereby allowing oil and gas to pass through the plunger cylinder (2). The downhole steam injection collection tool can separately carry out steam injection and collection. After steam injection is completed, no apparatus needs to be removed, and a steam injection state is directly switched into an oil pumping state, which shortens the switching time, reduces heat loss, and saves costs.

Description

Downhole steam injection collection tools and drilling collection equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of Chinese patent application No. 202311140292.4 filed on September 5, 2023, the contents of which are incorporated herein by reference. Technical Field

[0003] The present invention relates to oil and gas collection, in particular to a downhole steam injection collection tool, and also to a drilling collection device. Background Art

[0004] Heavy oil development technology is increasingly demanding. Due to the high flow resistance of highly viscous, high-freezing-point heavy oil, heavy oil has difficulty penetrating reservoirs into wellbores or being lifted to the surface. Therefore, technical means must be employed to artificially reduce factors such as viscosity and freezing point, which significantly influence its flow rate. Heavy oil thermal recovery, currently the world's largest engineering project for enhancing crude oil and heavy oil recovery, has experienced rapid growth. Thermal recovery primarily includes steam stimulation, steam flooding, steam-assisted gravity drainage (SAGD), hot water flooding, and reservoir thermal combustion.

[0005] Steam-assisted gravity drainage (SAGD) involves first injecting steam into the reservoir to increase the pressure, and then using the higher pressure to collect oil and gas. Different tools need to be switched between steam injection and collection, increasing tool costs and the number of operational steps.

[0006] Summary of the Invention

[0007] The purpose of the present invention is to overcome the problem in the prior art that tools need to be replaced during steam injection and collection.

[0008] In order to achieve the above-mentioned objectives, the present invention provides, on the one hand, a downhole steam injection and collection tool, which includes an outer tube and a plunger device arranged in the outer tube, the plunger device includes a plunger tube forming a steam injection annulus with the outer tube, the lower part of the outer tube is provided with a steam injection hole connected to the steam injection annulus, the upper part of the plunger tube is provided with a vent hole connected to the steam injection annulus, the plunger device includes a floating valve assembly arranged in the plunger tube, and the floating valve assembly can be operated to move axially relative to the plunger tube to open or close the floating valve, thereby allowing oil and gas to pass through the plunger tube.

[0009] In some embodiments, the floating valve assembly includes a piston outer cylinder, a piston inner cylinder arranged in the piston outer cylinder, a downstream floating valve gasket arranged at the upper end of the piston inner cylinder, a downstream floating valve arranged on the upper side of the downstream floating valve gasket, a piston joint spring arranged between the piston inner cylinder and the piston outer cylinder, and a limit pin radially passing through the piston outer cylinder, a spring sheet elastically acting on the limit pin is provided on the outer periphery of the piston outer cylinder, a groove is provided on the inner periphery of the plunger cylinder, the piston outer cylinder can move axially between an upper position and a lower position, in the upper position, the spring sheet is located in the groove, the limit pin moves radially outward to allow the piston inner cylinder to move downward, the downstream floating valve disengages and opens the downstream floating valve gasket; in the lower position, the spring sheet disengages from the groove, the limit pin limits the downward movement of the piston inner cylinder, and the downstream floating valve engages and closes the downstream floating valve gasket.

[0010] In some embodiments, a first boss is provided at the lower portion of the outer periphery of the piston inner tube, a second boss is provided at the middle portion of the inner periphery of the piston outer tube, and the piston joint spring is provided between the first boss and the second boss to enable the piston inner tube to move upward and press the downstream movable valve gasket onto the downstream movable valve.

[0011] In some embodiments, a third boss is provided on the upper portion of the outer periphery of the piston inner tube, and in the upper position, the limit pin is located radially outside the third boss, and in the lower position, the limit pin is located axially below the third boss.

[0012] In some embodiments, the limit pin includes a nail head and a nail tail rotatably hinged to the nail head, the nail tail can rotate upward under the pressure of oil and gas to reduce the radial dimension of the limit pin, and the nail tail can rotate downward under the action of gravity to increase the radial dimension of the limit pin.

[0013] In some embodiments, the floating valve assembly includes a piston connector connected to the upper end of the piston outer tube, an axially movable downstream floating valve base is provided on the piston connector, the downstream floating valve is connected to the downstream floating valve base, and a downstream floating valve spring is provided between the downstream floating valve and the piston connector.

[0014] In some embodiments, the upper end of the piston connector is connected to a tubular exhaust member, and the exhaust member is provided with an exhaust hole.

[0015] In some embodiments, the upper end of the steam exhaust part is connected to an upstream movable valve base having a flow groove, an upstream movable valve gasket is arranged between the upstream movable valve base and the steam exhaust part, and an axially movable upstream movable valve and an upstream movable valve spring elastically acting on the upstream movable valve are arranged on the upstream movable valve base.

[0016] In some embodiments, the upstream movable valve seat can be connected to a sucker rod.

[0017] In some embodiments, the plunger device further comprises a pressure regulating retaining ring disposed on the lower side of the traveling valve assembly, wherein a pressure regulating nozzle is disposed in the pressure regulating retaining ring.

[0018] In some embodiments, the lower end of the plunger cylinder is connected to a fixed valve outer cylinder, a fixed valve axially movably arranged in the fixed valve outer cylinder, a fixed valve spring elastically acting on the fixed valve, and a fixed valve gasket arranged at the lower end of the fixed valve outer cylinder.

[0019] In some embodiments, the lower end of the fixed valve outer cylinder is connected to a lower joint.

[0020] In some embodiments, the upper end of the outer cylinder is connected to an upper joint.

[0021] On the other hand, this solution also provides a drilling and collection equipment, wherein the drilling and collection equipment includes a pipe string and the downhole steam injection and collection tool described in the above solution.

[0022] Through the above technical solution, the downhole steam injection and collection tool can perform steam injection and collection separately. After the steam injection is completed, there is no need to remove any device, and it can directly switch from the steam injection state to the oil pumping state, shortening the switching time, reducing heat loss, and saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1 is a cross-sectional view of a downhole steam injection and collection tool according to an embodiment of the present invention.

[0024] FIG2 is a schematic structural diagram of the outer cylinder according to an embodiment of the present invention.

[0025] FIG3 is a schematic structural diagram of the limit pin according to an embodiment of the present invention.

[0026] FIG4 is a schematic structural diagram of the upstream movable valve base according to an embodiment of the present invention.

[0027] FIG5 is a schematic structural diagram of the pressure regulating retaining ring according to an embodiment of the present invention.

[0028] FIG6 is a schematic structural diagram of the piston connector according to an embodiment of the present invention.

[0029] FIG7 is a schematic structural diagram of the piston outer cylinder according to an embodiment of the present invention.

[0030] FIG8 is a schematic structural diagram of the fixed valve outer cylinder according to an embodiment of the present invention.

[0031] FIG9 is a partially enlarged view of the downhole steam injection and collection tool described in an embodiment of this solution.

[0032] Explanation of the accompanying drawings: 1-upper joint, 2-plunger cylinder, 3-steam exhaust device, 4-piston connecting part, 5-spring sheet, 6-limit pin, 7-piston lower part, 8-piston outer cylinder, 9-first limit part, 10-pressure regulating retaining ring, 11-second limit part, 12-outer cylinder, 13-fixed valve outer cylinder, 14-lower joint, 15-fixed valve gasket, 16-fixed valve, 17-fixed valve spring, 18-piston lower joint, 19-piston joint spring, 20-downstream movable valve gasket, 21-downstream movable valve, 22-downstream movable valve spring, 23-downstream movable valve base, 24-upstream movable valve gasket, 25-upstream movable valve, 26-upstream movable valve spring, 27-upstream movable valve base. DETAILED DESCRIPTION

[0033] The following embodiments of the present disclosure are further described in detail with reference to the accompanying drawings and examples. The detailed description of the following examples and the accompanying drawings are intended to illustrate the principles of the present disclosure, but are not intended to limit the scope of the present disclosure. The present disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but rather includes all technical solutions within the scope of the claims.

[0034] The present disclosure provides these embodiments in order to make this disclosure thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that: unless otherwise specifically stated, the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values ​​set forth in these embodiments should be interpreted as merely exemplary, and not as limiting.

[0035] It should be noted that, in the description of this disclosure, unless otherwise specified, "plurality" means greater than or equal to two; terms such as "upper," "lower," "left," "right," "inner," and "outer" indicating directions or positional relationships are intended solely to facilitate and simplify the description of this disclosure, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this disclosure. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0036] In addition, the terms "first," "second," and similar terms used in this disclosure do not denote any order, quantity, or importance, but are merely used to distinguish different parts. "Perpendicular" does not mean perpendicular in the strict sense, but rather means within the tolerance range. "Parallel" does not mean parallel in the strict sense, but rather means within the tolerance range. "Include" or "comprising" and similar terms mean that the elements preceding the term include the elements listed after the term, and do not exclude the possibility of also including other elements.

[0037] It should also be noted that, in the description of this disclosure, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this disclosure depending on the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intervening device between the specific device and the first or second device.

[0038] All terms used in this disclosure have the same meaning as understood by one of ordinary skill in the art to which this disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in, for example, common dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and should not be interpreted in an idealized or highly formal sense, unless explicitly defined as such herein.

[0039] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0040] Referring to Figures 1 to 9, the present solution provides a downhole steam injection and collection tool, which includes an outer tube 12 and a plunger device arranged in the outer tube 12. The plunger device includes a plunger tube 2 that forms a steam injection annulus with the outer tube 12. The lower part of the outer tube 12 is provided with a steam injection hole connected to the steam injection annulus. The upper part of the plunger tube 2 is provided with a vent hole connected to the steam injection annulus. The plunger device includes a floating valve assembly arranged in the plunger tube 2. The floating valve assembly can be operated to move axially relative to the plunger tube 2 to open the floating valve, thereby allowing oil and gas to pass through the plunger tube 2.

[0041] The outer tube 12 is the external structure of the downhole steam injection and collection tool. The plunger tube 2 is concentrically arranged in the outer tube 12, and a steam injection annulus is formed between the two. The steam injected into the plunger tube 2 can enter the steam injection annulus through the vent hole and be discharged through the steam injection hole at the lower part of the outer tube 12 and injected into the reservoir.

[0042] A flow guide cover may be provided on the outside of the outer cylinder 12, with its opening facing downward to protect the steam injection holes so that the steam injection airflow flows downward.

[0043] The plunger device also includes a floating valve assembly arranged in the plunger barrel 2. By operating the floating valve assembly, it can be opened or closed, thereby allowing oil and gas to flow upward through the plunger device when the floating valve assembly is opened, thereby realizing oil and gas collection.

[0044] The steam injection and collection process of the downhole steam injection and collection tool can be as follows: the floating valve assembly remains closed, at this time, steam is injected into the plunger tube 2 to inject steam into the reservoir through the steam injection hole of the outer tube 12, thereby increasing the pressure in the reservoir; after stopping the steam injection, the floating valve assembly is opened, and the oil and gas flow upward at high pressure, thereby passing through the plunger device to realize the collection of oil and gas; repeat the above operations to realize the steam injection and collection cycle.

[0045] It should be noted that the flow area of ​​the vent is relatively small. When oil and gas pass through the plunger device, only a small amount of oil and gas enters the steam injection annulus through the vent, which will not affect the collection of oil and gas. Moreover, when the oil and gas pressure is too high, the presence of the vent can avoid or alleviate blowouts.

[0046] In this solution, steam injection and oil collection can be carried out separately. After the steam injection is completed, there is no need to remove any equipment, and the state can be directly switched from steam injection to oil extraction, which shortens the switching time, reduces heat loss, and saves costs.

[0047] In which, the floating valve assembly includes a piston outer tube 8, a piston inner tube arranged in the piston outer tube 8, a downstream floating valve gasket 20 arranged at the upper end of the piston inner tube, a downstream floating valve 21 arranged on the upper side of the downstream floating valve gasket 20, a piston joint spring 19 arranged between the piston inner tube and the piston outer tube 8, and a limit pin 6 radially passing through the piston outer tube 8. A spring sheet 5 elastically acting on the limit pin 6 is provided on the outer periphery of the piston outer tube 8. A groove is provided on the inner periphery of the plunger tube 2. The piston outer tube 8 can move axially between an upper position and a lower position. In the upper position, the spring sheet 5 is located in the groove, the limit pin 6 moves radially outward to allow the piston inner tube to move downward, and the downstream floating valve 21 disengages from and opens the downstream floating valve gasket 20; in the lower position, the spring sheet 5 disengages from the groove, the limit pin 6 limits the downward movement of the piston inner tube, and the downstream floating valve 21 engages and closes the downstream floating valve gasket 20.

[0048] As shown in Figure 1, the piston inner tube includes a piston lower joint 18 and a piston lower component 7, which are inserted into the piston outer tube 8. A piston joint spring 19 is arranged between the two. The piston joint spring 19 can move the piston inner tube downward, thereby driving the downstream movable valve gasket 20 to disengage from the downstream movable valve 21.

[0049] As shown in Reference Figure 7, a rectangular groove 82 is provided on the outer periphery of the piston outer tube 8 to accommodate the curved spring sheet 5, and a through hole 83 is provided in each rectangular groove 82 to accommodate the limit pin 6 to pass through. The spring sheet 5 can act on the limit pin 6 so that the limit pin 6 can intervene in the interior of the piston outer tube 8 to limit the axial movement of the piston inner tube; when the piston outer tube 8 moves to allow the spring sheet 5 to enter the groove of the plunger tube 2, the limit pin 6 moves radially outward, thereby releasing the axial limiting effect on the piston inner tube (piston lower component 7), thereby allowing the piston lower component 7 and the piston lower joint 18 to move downward.

[0050] The lower end of the downstream movable valve 21 is roughly spherical, and the downstream movable valve gasket 20 forms a circular hole. When the downstream movable valve 21 is pressed against the circular hole, the downstream movable valve is in a closed and disconnected state. When the downstream movable valve gasket 20 moves downward, the downstream movable valve 21 disengages from the circular hole to open the downstream movable valve, thereby allowing oil and gas to pass through.

[0051] When it is necessary to open the plunger device, the plunger device can be operated to move the piston outer tube 8 upward to reach a position where the spring sheet 5 is aligned with the groove of the plunger tube 2. Under the action of the piston joint spring 19, the piston lower component 7 and the piston lower joint 18 move downward; when it is necessary to close the plunger device, the plunger device can be operated to move the piston outer tube 8 downward, the spring sheet 5 is staggered with the groove of the plunger tube 2, and the piston lower component 7 and the piston lower joint 18 move upward.

[0052] The lower portion of the outer circumference of the piston inner tube is provided with a first boss, and the middle portion of the inner circumference of the piston outer tube 8 is provided with a second boss. The piston joint spring 19 is positioned between the first and second bosses, enabling the piston inner tube to move upward and compress the downstream movable valve gasket 20 against the downstream movable valve 21. A first boss 81 is provided on the inner circumference of the piston outer tube 8. The piston lower joint 18 is partially inserted into the piston lower component 7, with the uninserted portion being larger than the outer diameter of the piston lower component 7 to form a second boss. The piston inner tube, consisting of the piston lower joint 18 and the piston lower component 7, is constructed for ease of processing and assembly.

[0053] A third boss is provided on the upper portion of the outer periphery of the piston inner tube. In the upper position, the limit pin 6 is located radially outward of the third boss, and in the lower position, the limit pin 6 is located axially below the third boss. The third boss is provided on the piston lower component 7. When the spring sheet 5 does not enter the groove of the plunger tube 2, the limit pin 6 is located at its radially inward limit position, axially below the third boss, to limit the downward movement of the piston lower component 7. When the spring sheet 5 enters the groove of the plunger tube 2, the limit pin 6 moves radially outward, allowing the piston lower component 7 to move downward, driving the downstream movable valve gasket 20 to move and disengage from the downstream movable valve 21.

[0054] The stop pin 6 includes a head 61 and a tail 63 rotatably hinged to the head 61. The tail 63 can rotate upward under oil and gas pressure to reduce the radial dimension of the stop pin 6, and can rotate downward under gravity to increase the radial dimension of the stop pin 6. As shown in FIG3 , the tail 63 is rotatably hinged to the head 61 via a hinge shaft 62. The tail 63 has an L-shaped stop structure. Under gravity, the stop structure is limited by a mating structure on the head 61, allowing the tail 63 to extend horizontally. Under oil and gas pressure, the tail 63 is pushed upward by the oil and gas, reducing the length of the stop pin 6, thereby allowing the boss of the piston lower component 7 to pass over the stop pin 6.

[0055] When the plunger device needs to be opened, the piston outer tube 8 can be driven upward, so that the spring sheet 5 enters the groove of the plunger tube 2, and the limit pin 6 moves radially outward. At the same time, the nail tail 63 rotates upward under the upward pressure of the oil and gas, and the length of the limit pin 6 inserted into the piston outer tube 8 becomes smaller. Under the elastic force of the piston joint spring 19, the piston lower part 7 moves downward, and the third boss above the limit pin 6 can pass over the limit pin 6 downward, and the downstream movable valve gasket 20 disengages from the downstream movable valve 21 to allow oil and gas to flow upward through the downstream movable valve gasket 20; when the plunger device needs to be closed, the piston outer tube 8 can be driven downward, the spring sheet 5 disengages from the groove of the plunger tube 2, and when the piston lower joint 18 collides with the structure located on its lower side, the piston lower joint 18 and the piston lower part 7 move upward relative to the piston outer tube 8. The third boss moves to the upper side of the stop pin 6, and the nail tail 63 rotates downward under the action of gravity. At the same time, the spring plate 5 pushes the stop pin 6 radially inward, and the stop pin 6 once again locks the piston lower part 7. When the plunger device needs to be closed, generally after collecting oil and gas, the oil and gas pressure drops, so the nail tail 63 can rotate downward under the action of gravity.

[0056] In addition, the floating valve assembly includes a piston connector 4 connected to the upper end of the piston outer tube 8. An axially movable downstream floating valve seat 23 is provided on the piston connector 4. The downstream floating valve 21 is connected to the downstream floating valve seat 23. A downstream floating valve spring 22 is provided between the downstream floating valve 21 and the piston connector 4. The upper portion of the downstream floating valve 21 passes through the downstream floating valve seat 23. The downstream floating valve spring 22 is located between the lower end ball of the downstream floating valve 21 and the downstream floating valve seat 23, allowing the downstream floating valve 21 to move to its downward limit position. When the piston inner tube moves upward, the downstream floating valve gasket 20 collides with the downstream floating valve 21. The downstream floating valve spring 22 acts as a buffer and presses the downstream floating valve 21 against the circular hole of the downstream floating valve gasket 20.

[0057] In addition, the upper end of the piston connector 4 is connected to a tubular exhaust member 3, which is provided with an exhaust hole. An annulus is formed between the exhaust member 3 and the plunger barrel 2. After the collected oil and gas enter the exhaust member 3, the gas can be allowed to enter the annulus between the exhaust member 3 and the plunger barrel 2 through the exhaust hole, and then enter the steam injection annulus through the vent hole on the plunger barrel 2, thereby discharging the gas back into the reservoir. In addition, when the oil and gas pressure is too high, some of the oil and gas can also be returned to the reservoir in this way, avoiding or alleviating blowouts.

[0058] Furthermore, the upper end of the steam exhaust component 3 is connected to an upstream movable valve seat 27 with a flow groove 273. An upstream movable valve gasket 24 is disposed between the upstream movable valve seat 27 and the steam exhaust component 3. The upstream movable valve seat 27 is equipped with an axially movable upstream movable valve 25 and an upstream movable valve spring 26 that elastically acts on the upstream movable valve 25. The flow groove 273 allows collected oil and gas to enter the annulus between the upstream movable valve seat 27 and the plunger cylinder 2, allowing further upward flow and collection. The upstream movable valve 25 and upstream movable valve gasket 24 cooperate in the same manner as the downstream movable valve 21 and downstream movable valve gasket 20, and will not be repeated here. When oil and gas enter the steam exhaust component 3, the pressure of the oil and gas causes the upstream movable valve 25 to move upward, opening the circular hole in the upstream movable valve gasket 24 and allowing the oil and gas to pass through. The oil and gas then enter the upstream movable valve seat 27 and are then discharged through the flow groove 273.

[0059] The upstream movable valve base 27 can be connected to the sucker rod. In addition, the upstream movable valve base 27 can be connected to the sucker rod so that the upstream movable valve base 27, the exhaust member 3, the piston connector 4, and the piston outer tube 8 can be driven by the sucker rod to axially move, thereby realizing the opening and closing of the plunger device.

[0060] The plunger assembly also includes a pressure-regulating retaining ring 10 disposed on the underside of the traveling valve assembly. A pressure-regulating nozzle 103 is provided within the retaining ring 10. Referring to Figure 5 , the retaining ring 10 is provided with the pressure-regulating nozzle 103 to regulate the pressure of the oil and gas. Furthermore, a wear ring 101 and a sealing ring 102 may be provided on the outer circumference of the retaining ring 10.

[0061] A first limiting member 9 and a second limiting member 11 may be provided on the upper and lower sides of the pressure regulating retaining ring 10 , respectively, so that the pressure regulating retaining ring 10 is fixed in the plunger cylinder 2 .

[0062] In addition, the lower end of the plunger tube 2 is connected to a fixed valve outer tube 13, a fixed valve 16 axially movably disposed within the fixed valve outer tube 13, a fixed valve spring 17 elastically acting on the fixed valve 16, and a fixed valve gasket 15 disposed at the lower end of the fixed valve outer tube 13. Specifically, a valve assembly is disposed at the lower end of the plunger tube 2. When the oil and gas pressure in the reservoir is high, particularly when the piston outer tube 8 and the piston lower joint 18 are moved upward, the space between the piston lower joint 18 and the fixed valve outer tube 13 increases, and the pressure decreases. The oil and gas pressure can act on the fixed valve 16, causing it to move upward, thereby opening the circular hole in the fixed valve gasket 15. The oil and gas then pass through the fixed valve outer tube 13 and reach the piston lower joint 18. The oil and gas can then further act on the nail tail 63 of the stop pin 6, causing it to rotate upward, allowing the piston lower component 7 to move downward.

[0063] In addition, a lower joint 14 is connected to the lower end of the fixed valve outer tube 13 . The lower joint 14 can be connected to a lower device, and the lower joint 14 can support a fixed valve gasket 15 in the fixed valve outer tube 13 .

[0064] In addition, the upper end of the outer tube 12 is connected to the upper joint 1. The upper joint 1 can be inserted into the upper end of the outer tube 12, and the plunger tube 2 can be inserted into the lower end of the upper joint 1, so that a steam injection annulus is formed between the outer tube 12 and the plunger tube 2.

[0065] Example 1

[0066] Figure 2 is a schematic diagram of the structure of the outer tube 12. The upper and lower ends of the outer tube 12 are provided with internal threads. The first internal thread 121 and the second internal thread 125 are respectively connected to the upper joint 1 and the fixed valve outer tube 13. In addition, the third thread 124 is used to connect the lower end of the plunger tube 2. There are four steam injection holes 122 in the lower section of the outer tube 12. A steam guide cover 123 is provided above each steam injection hole 122. The steam injection holes 122 are in a normally open state, providing a circulation path for the steam, and can act as an oil drain to a certain extent, reducing the possibility of blowout. Both ends of the steam exhaust part 3 are provided with external threads. The upper and lower ends are respectively connected to the fifth internal thread 274 of the upstream movable valve base 24 and the seventh internal thread 45 on the upper part of the piston connector 4, and four steam exhaust holes are opened in the circumferential direction.

[0067] As shown in Figure 4 , the upstream movable valve base 27 is provided with a fourth internal thread 271 and a fifth internal thread 274, which are used to connect to the sucker rod and the steam exhaust component 3, respectively. The central portion of the upstream movable valve base 27 is divided into two layers. The inner cylinder 272, whose inner diameter matches the cylindrical portion of the upstream movable valve 25, houses the upstream movable valve 25 and limits its axial displacement. The interlayer between the inner cylinder 272 and the outer shell of the upstream movable valve 25 houses the upstream movable valve spring 26. Four flow grooves 273 are defined at the bottom of the upstream movable valve base 27 for oil and gas circulation.

[0068] Referring to Figure 6, the piston connector 4 includes an upper section and a lower section. Four first flow holes 43 (which can be fan-shaped) are provided on the connecting plates of the two sections. A through-hole 42 is provided in the center of the lower section for installing the downstream movable valve 21. The interlayer formed between the through-hole 42 and the downstream movable valve 21 is used to install the downstream movable valve spring 22; a sixth internal thread 41 is provided in the through-hole 42, and a seventh internal thread 45 is provided at the upper end of the upper section for connecting to the exhaust part 3. A first external thread 44 is provided at the lower end for connecting to the piston outer tube 8.

[0069] Referring to Figure 7 , the upper portion of the piston outer tube 8 is provided with a third internal thread 84, which engages with the first external thread 44 on the exterior of the piston connector 4. A second boss 81 is provided on the interior of the lower end of the piston outer tube 8 for limiting the position of the piston lower component 7 and the piston lower joint 18. Four rectangular grooves 82 are evenly distributed circumferentially on the exterior of the lower end for mounting and limiting the spring sheet 5. Each rectangular groove 82 has a through-hole 83 at its center for mounting a limiting pin 6, which can move radially within the through-hole 83 as the spring sheet 5 contracts and expands. The piston lower component 7 and the piston lower joint 18 are connected by a threaded connection. The first boss of the piston lower joint 18 engages with the second boss 81 of the piston outer tube 8 to accommodate the piston joint spring 19. When an external force pushes on the piston lower joint 18, the piston joint spring 19 is compressed. When the piston joint spring 19 expands and recovers, it pushes the piston lower joint 18 downward.

[0070] 8 , the upper and lower ends of the fixed valve outer tube 13 are provided with threads, and the second external thread 133 and the eighth internal thread 131 are respectively connected to the second internal thread 125 at the lower end of the outer tube 12 and the external thread of the lower joint 14 to achieve axial fixation; the upper part of the fixed valve outer tube 13 is provided with four second flow holes 134 to provide a path for oil and gas, and a cylinder 132 with an inner diameter the same as the diameter of the cylindrical part of the fixed valve 16 is provided on the inner side for installing the fixed valve 16 and limiting its axial displacement.

[0071] Example 2

[0072] Figure 2 is a schematic diagram of the structure of the outer tube 12. The upper and lower ends of the outer tube 12 are provided with internal threads. The first internal thread 121 and the second internal thread 125 are respectively connected to the upper joint 1 and the fixed valve outer tube 13. In addition, the third thread 124 is used to connect the lower end of the plunger tube 2. There are five steam injection holes 122 in the lower section of the outer tube 12. A steam guide cover 123 is provided above each steam injection hole 122. The steam injection hole 122 is in a normally open state, providing a flow path for the steam, and can act as an oil drain to a certain extent, reducing the possibility of blowout. Both ends of the steam exhaust part 3 are provided with external threads. The upper and lower ends are respectively connected to the fifth internal thread 274 of the upstream movable valve base 124 and the seventh internal thread 45 on the upper part of the piston connector 4, and five steam exhaust holes are opened in the circumference.

[0073] As shown in Figure 4 , the upstream movable valve base 27 is provided with a fourth internal thread 271 and a fifth internal thread 274, which are used to connect to the sucker rod and the steam exhaust component 3, respectively. The central portion of the upstream movable valve base 27 is divided into two layers. The inner cylinder 272, whose inner diameter matches the cylindrical portion of the upstream movable valve 25, houses the upstream movable valve 25 and limits its axial displacement. The interlayer between the inner cylinder 272 and the outer shell of the upstream movable valve 25 houses the upstream valve spring 26. Five flow grooves 273 are defined at the bottom of the upstream movable valve base 27 for oil and gas circulation.

[0074] Referring to Figure 6, the piston connector 4 includes an upper section and a lower section. Five first flow holes 43 (which can be fan-shaped) are provided on the connecting plates of the two sections. A through-hole 42 is provided in the center of the lower section for installing the downstream movable valve 21. The interlayer formed between the through-hole 42 and the downstream movable valve 21 is used to install the downstream movable valve spring 22; a sixth internal thread 42 is provided in the through-hole 42, and a seventh internal thread 45 is provided at the upper end of the upper section for connecting to the exhaust part 3. A first external thread 44 is provided at the lower end for connecting to the piston outer tube 8.

[0075] Referring to Figure 7 , the upper portion of the piston outer tube 8 is provided with a third internal thread 84, which engages with the first external thread 44 on the exterior of the piston connector 4. A second boss 81 is provided on the interior of the lower end of the piston outer tube 8 for limiting the position of the piston lower component 7 and the piston lower joint 18. Five rectangular grooves 82 are evenly distributed circumferentially on the exterior of the lower end for mounting and limiting the spring sheet 5. Each rectangular groove 82 has a through-hole 83 at its center for mounting a limiting pin 6, which moves radially within the through-hole 83 as the spring sheet 5 contracts and expands. The piston lower component 7 and the piston lower joint 18 are connected by threads. The first boss of the piston lower joint 18 engages with the second boss 81 of the piston outer tube 8 to accommodate the piston joint spring 19. When an external force pushes on the piston lower joint 18, the piston joint spring 19 is compressed. When the piston joint spring 19 expands and recovers, it pushes the piston lower joint 18 downward.

[0076] 8 , the upper and lower ends of the fixed valve outer tube 13 are provided with threads, and the second external thread 133 and the eighth internal thread 131 are respectively connected to the second internal thread 125 at the lower end of the outer tube 12 and the external thread of the lower joint 14 to achieve axial fixation; the upper part of the fixed valve outer tube 13 is provided with five second flow holes 134 to provide a path for oil and gas, and a cylinder 132 with an inner diameter the same as the diameter of the cylindrical part of the fixed valve 16 is provided on the inner side for installing the fixed valve 16 and limiting its axial displacement.

[0077] Example 3

[0078] Figure 2 is a schematic diagram of the structure of the outer tube 12. The upper and lower ends of the outer tube 12 are provided with internal threads. The first internal thread 121 and the second internal thread 125 are respectively connected to the upper joint 1 and the fixed valve outer tube 13. In addition, the third thread 124 is used to connect the lower end of the plunger tube 2. There are 6 steam injection holes 122 in the lower section of the outer tube 12. There is a steam guide cover 123 above each steam injection hole 122. The steam injection holes 122 are in a normally open state, providing a circulation path for the steam, and can act as an oil drain to a certain extent, reducing the possibility of blowout. Both ends of the steam exhaust part 3 are provided with external threads. The upper and lower ends are respectively connected to the fifth internal thread 274 of the upstream movable valve base 124 and the seventh internal thread 45 on the upper part of the piston connector 4, and 6 steam exhaust holes are opened in the circumference.

[0079] As shown in Figure 4 , the upstream movable valve base 27 is provided with a fourth internal thread 271 and a fifth internal thread 274, which are used to connect to the sucker rod and the steam exhaust component 3, respectively. The central portion of the upstream movable valve base 27 is divided into two layers. The inner cylinder 272, whose inner diameter matches the cylindrical portion of the upstream movable valve 25, houses the upstream movable valve 25 and limits its axial displacement. The interlayer between the inner cylinder 272 and the outer shell of the upstream movable valve 25 houses the upstream movable valve spring 26. Six flow grooves 273 are defined at the bottom of the upstream movable valve base 27 for oil and gas circulation.

[0080] Referring to Figure 6, the piston connector 4 includes an upper section and a lower section. Six first flow holes 43 (which can be fan-shaped) are provided on the connecting plates of the two sections. A through-hole 42 is provided in the center of the lower section for installing the downstream movable valve 21. The interlayer formed between the through-hole 42 and the downstream movable valve 21 is used to install the downstream movable valve spring 22; a sixth internal thread 42 is provided in the through-hole 42, and a seventh internal thread 45 is provided at the upper end of the upper section for connecting to the exhaust part 3. A first external thread 44 is provided at the lower end for connecting to the piston outer tube 8.

[0081] Referring to Figure 7 , the upper portion of the piston outer tube 8 is provided with a third internal thread 84, which engages with the first external thread 44 on the exterior of the piston connector 4. A second boss 81 is provided on the interior of the lower end of the piston outer tube 8 for limiting the position of the piston lower component 7 and the piston lower joint 18. Six rectangular grooves 82 are evenly distributed circumferentially on the exterior of the lower end for mounting and limiting the spring sheet 5. Each rectangular groove 82 has a through-hole 83 at its center for mounting a limiting pin 6, which can move radially within the through-hole 83 as the spring sheet 5 contracts and expands. The piston lower component 7 and the piston lower joint 18 are connected by threads. The first boss of the piston lower joint 18 engages with the second boss 81 of the piston outer tube 8 to accommodate the piston joint spring 19. When an external force pushes on the piston lower joint 18, the piston joint spring 19 is compressed. When the piston joint spring 19 expands and recovers, it pushes the piston lower joint 18 downward.

[0082] 8 , the upper and lower ends of the fixed valve outer tube 13 are provided with threads, and the second external thread 133 and the eighth internal thread 131 are respectively connected to the second internal thread 125 at the lower end of the outer tube 12 and the external thread of the lower joint 14 to achieve axial fixation; the upper part of the fixed valve outer tube 13 is provided with 6 second flow holes 134 to provide a path for oil and gas, and a cylinder 132 with an inner diameter the same as the diameter of the cylindrical part of the fixed valve 16 is provided on the inner side for installing the fixed valve 16 and limiting its axial displacement.

[0083] On the other hand, this solution also provides a drilling and collection equipment, wherein the drilling and collection equipment includes a pipe string and the downhole steam injection collection tool described in the above solution. The downhole steam injection collection tool is connected to the pipe string and driven by a sucker rod.

[0084] Thus far, various embodiments of the present disclosure have been described in detail. To avoid obscuring the concept of the present disclosure, some details known in the art have not been described. Based on the above description, those skilled in the art can fully understand how to implement the technical solutions disclosed herein.

[0085] Although some specific embodiments of the present disclosure have been described in detail through examples, those skilled in the art will understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present disclosure. Those skilled in the art will understand that the above embodiments may be modified or some technical features may be replaced with equivalents without departing from the scope and spirit of the present disclosure. In particular, as long as there are no structural conflicts, the various technical features mentioned in the various embodiments may be combined in any manner.

Claims

1. A downhole steam injection and collection tool, characterized in that: The invention comprises an outer cylinder (12) and a plunger device arranged in the outer cylinder (12), wherein the plunger device comprises a plunger cylinder (2) forming a steam injection annulus with the outer cylinder (12), a steam injection hole connected to the steam injection annulus is arranged at the lower part of the outer cylinder (12), and a vent hole connected to the steam injection annulus is arranged at the upper part of the plunger cylinder (2), and the plunger device comprises a floating valve assembly arranged in the plunger cylinder (2), and the floating valve assembly can be operated to move axially relative to the plunger cylinder (2) to open or close the floating valve, thereby allowing oil and gas to pass through the plunger cylinder (2).

2. The downhole steam injection and collection tool according to claim 1, characterized in that: The floating valve assembly comprises a piston outer cylinder (8), a piston inner cylinder arranged in the piston outer cylinder (8), a downstream floating valve gasket (20) arranged at the upper end of the piston inner cylinder, a downstream floating valve (21) arranged on the upper side of the downstream floating valve gasket (20), a piston joint spring (19) arranged between the piston inner cylinder and the piston outer cylinder (8), a limit pin (6) radially penetrating the piston outer cylinder (8), a spring sheet (5) elastically acting on the limit pin (6) is arranged on the outer periphery of the piston outer cylinder (8), and the inner periphery of the plunger cylinder (2) is provided with a plurality of spring sheets (5) elastically acting on the limit pin (6). A groove is provided on the periphery, and the piston outer tube (8) can move axially between an upper position and a lower position. In the upper position, the spring sheet (5) is located in the groove, and the limit pin (6) moves radially outward to allow the piston inner tube to move downward, and the downstream movable valve (21) disengages from and opens the downstream movable valve gasket (20); in the lower position, the spring sheet (5) disengages from the groove, and the limit pin (6) limits the downward movement of the piston inner tube, and the downstream movable valve (21) engages with and closes the downstream movable valve gasket (20).

3. The downhole steam injection and collection tool according to claim 2, characterized in that: A first boss is provided at the lower part of the outer circumference of the piston inner tube, a second boss is provided at the middle part of the inner circumference of the piston outer tube (8), and the piston joint spring (19) is provided between the first boss and the second boss so that the piston inner tube moves upward and presses the downstream movable valve gasket (20) onto the downstream movable valve (21).

4. The downhole steam injection and collection tool according to claim 3, characterized in that: A third boss is provided at the upper part of the outer periphery of the piston inner tube. At the upper position, the limit pin (6) is located radially outside the third boss. At the lower position, the limit pin (6) is located axially below the third boss.

5. The downhole steam injection and collection tool according to claim 4, characterized in that: The limit pin (6) comprises a nail head (61) and a nail tail (63) rotatably hinged to the nail head (61); the nail tail (63) can rotate upward under the pressure of oil and gas to reduce the radial size of the limit pin (6); and the nail tail (63) can rotate downward under the action of gravity to increase the radial size of the limit pin (6).

6. The downhole steam injection and collection tool according to claim 2, characterized in that: The floating valve assembly comprises a piston connector (4) connected to the upper end of the piston outer tube (8), an axially movable downstream floating valve base (23) is provided on the piston connector (4), the downstream floating valve (21) is connected to the downstream floating valve base (23), and a downstream floating valve spring (22) is provided between the downstream floating valve (21) and the piston connector (4).

7. The downhole steam injection and collection tool according to claim 6, characterized in that: The upper end of the piston connecting member (4) is connected to a tubular exhaust member (3), and the exhaust member (3) is provided with an exhaust hole.

8. The downhole steam injection and collection tool according to claim 7, characterized in that: The upper end of the exhaust component (3) is connected to an upstream movable valve base (27) having a flow groove (273), an upstream movable valve gasket (24) is arranged between the upstream movable valve base (27) and the exhaust component (3), and an axially movable upstream movable valve (25) and an upstream movable valve spring (26) elastically acting on the upstream movable valve (25) are arranged on the upstream movable valve base (27).

9. The downhole steam injection and collection tool according to claim 8, characterized in that: The upstream movable valve base (27) can be connected to a sucker rod.

10. The downhole steam injection and collection tool according to claim 2, characterized in that: The plunger device further comprises a pressure regulating retaining ring (10) arranged at the lower side of the traveling valve assembly, and a pressure regulating nozzle (103) is arranged in the pressure regulating retaining ring (10).

11. The downhole steam injection and collection tool according to claim 1, characterized in that: The lower end of the plunger cylinder (2) is connected to a fixed valve outer cylinder (13), a fixed valve (16) axially movably arranged in the fixed valve outer cylinder (13), a fixed valve spring (17) elastically acting on the fixed valve (16), and a fixed valve gasket (15) arranged at the lower end of the fixed valve outer cylinder (13).

12. The downhole steam injection and collection tool according to claim 11, characterized in that: The lower end of the fixed valve outer cylinder (13) is connected to a lower joint (14).

13. The downhole steam injection and collection tool according to claim 1, characterized in that: The upper end of the outer cylinder (12) is connected to an upper joint (1).

14. A drilling and collection equipment, characterized in that: The drilling and collection equipment comprises a pipe string and a downhole steam injection and collection tool as described in any one of claims 1-13.

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