Drain and method of use

Abstract

This application relates to the field of oil production tools, and more specifically, to an oil drainer with blowout and sand prevention functions, and a method for using the oil drainer. In this application, when the foot valve is engaged with the main body, crude oil cannot be drawn. Thus, during well workover operations, the second drain hole is aligned with the first drain hole to drain the oil, allowing the well fluid containing crude oil in the tubing to be discharged, for example, into the annular space between the tubing and casing. This prevents blowout accidents caused by excessive bottom hole pressure during workover operations. When the foot valve is separated from the main body, crude oil can be drawn, ensuring the normal operation of oil pumping. When the drainage volume of the two drain holes is insufficient, pressure can be applied to the well from the wellhead. When the force acting on the rupture disc reaches the rupture pressure, the rupture disc breaks, connecting the drain holes and effectively increasing the drainage volume. In some embodiments of this application, a filter screen is disposed inside the main body, and the filter screen has mesh openings for sand prevention. During oil pumping operations, the filter screen is always in operation to prevent sand and gravel at the bottom of the well from clogging the drain holes.

Description

Technical Field

[0001] This application relates to the field of oil production tools, and more specifically, to an oil drainer with blowout prevention and sand control functions, and a method for using the oil drainer. Background Technology

[0002] In downhole maintenance and drilling operations, the ejection of liquids and crude oil from the well casing is a major cause of environmental pollution and maintenance difficulties. Effective solutions and prevention measures are lacking, severely impacting construction efficiency, safety, and environmental value. In the event of an oil spill, the ejected crude oil is extremely difficult to clean up, causing irreversible damage to surface vegetation and water bodies, and increasing safety risks during construction.

[0003] Oil drainers drain crude oil from pipes, preventing it from leaking onto the ground and causing environmental pollution. Currently, there are four main types of oil drainers: hydraulic, pull-up, impact, and rotary. Pull-up and impact drainers are widely used in oilfields due to their simple structure and practicality. Existing oil drainers either lack integrated blowout and sand control functions or their functions are inadequate, requiring redesign. Summary of the Invention

[0004] In view of the above, this application provides an oil drainer and a method of using it to solve one or more technical problems in the related art or to provide technical support for solving the technical problems. This application is implemented as follows:

[0005] In a first aspect, embodiments of this application provide an oil drain device, comprising a main body, an upper connector, a guide head, a connecting pipe, a return spring, and a bottom valve:

[0006] The upper end of the main body is provided with a first guide rail protruding from the inner surface of the main body. The number of the first guide rails is multiple and they are distributed at intervals on the inner surface of the main body. The lower end of the first guide rail is formed with a first V-shaped inclined surface and a first single-sided inclined surface.

[0007] The guide head has a second guide rail protruding from its outer surface. The second guide rail is multiple and spaced apart on the outer surface of the guide head. The first guide rail engages with the second guide rail to limit the movement direction of the second guide rail to be along the first guide rail. The lower end of the second guide rail has a second V-shaped inclined surface, and the first V-shaped inclined surface is located outside the second V-shaped inclined surface.

[0008] The connecting pipe is located inside the main body, and at least a portion of the guide head is located inside the main body. A third guide rail protruding from the outer surface of the connecting pipe is formed at the upper end of the connecting pipe. The upper end of the third guide rail has a second single-sided inclined surface. The outer portion of the second single-sided inclined surface engages with both the first V-shaped inclined surface and the first single-sided inclined surface, while the inner portion of the second single-sided inclined surface engages with the second V-shaped inclined surface. The guide head moves downward under the force of the sucker rod. Under the action of the second V-shaped inclined surface, the second single-sided inclined surface slides into the first V-shaped inclined surface. When the sucker rod acts on the guide head again, and the second single-sided inclined surface slides out from the first single-sided inclined surface under the action of the second V-shaped inclined surface, the third guide rail meshes with the first guide rail and moves upward along the first guide rail.

[0009] The connecting tube is connected to the main body via a return spring. When the return spring is compressed downward, it releases its elastic potential and pushes the connecting tube upward, thereby driving the guide head to move upward.

[0010] The upper connector is sleeved on the outside of the main body, the main body is provided with a first oil drain hole, and the upper connector is provided with a second oil drain hole; the rotation of the upper connector drives the second oil drain hole to rotate, and the oil drain is opened when the second oil drain hole coincides with the first oil drain hole, and the oil drain is closed when the second oil drain hole is misaligned with the first oil drain hole.

[0011] In some embodiments, the body and the upper connector are connected by threads, and a pin fixes the body and the upper connector; the upper connector rotates around the body under the action of an external force to shear the pin and release the fixation between the body and the upper connector;

[0012] Preferably, the upper end of the main body has a first reduction portion, the upper connector has a second reduction portion, both the first reduction portion and the second reduction portion are provided with threads, and the second reduction portion limits the main body;

[0013] Preferably, the upper connector is connected to the oil pipe, and the rotation of the oil pipe drives the upper connector to rotate;

[0014] Preferably, the upper part of the guide head is in direct contact with the sucker rod, and the sucker rod pushes the guide head to move upward or downward.

[0015] In some embodiments, the number of the first drain holes is multiple, and some of the first drain holes are provided with rupture discs, which block the corresponding first drain holes;

[0016] The rupture disc is connected to a pressure cap. Under external force, the pressure cap moves downward, which in turn drives the rupture disc downward, making the rupture disc more tightly connected to the corresponding first drain hole. When the force acting on the rupture disc reaches its burst pressure, the rupture disc ruptures, connecting the first drain hole to the second drain hole, increasing the oil drainage volume. If the drain holes on the upper connector cannot meet the oil drainage requirements, pressure can be pumped into the well from the wellhead. When the burst pressure of the rupture disc is reached, the rupture disc opens, increasing the number of working first drain holes and increasing the oil drainage volume.

[0017] In some embodiments, the oil drainer also includes a filter screen tube;

[0018] The filter screen tube is connected inside the main body, and the filter screen tube has sieve holes for sand prevention. The filter screen tube also blocks the first oil drain hole.

[0019] Preferably, the main body has an upward-facing first protrusion inside, and the filter screen tube has an edge that overlaps the first protrusion. The return spring ensures a better connection between the filter screen tube and the first protrusion. The return spring prevents the filter screen tube from detaching from the first protrusion, maintaining its relatively fixed position within the main body and preserving its sand-proof effect.

[0020] Preferably, the sieve opening extends through the filter screen tube, and the sieve opening includes an outer opening formed on the outer surface of the filter screen tube and an inner opening formed on the inner surface of the filter screen tube, wherein the inner opening is higher than the outer opening.

[0021] In some embodiments, the bottom valve is provided with a second connection hole;

[0022] The bottom of the connecting pipe is provided with a first connecting hole and an oil outlet hole. The sealing member passes through the first connecting hole and the second connecting hole from top to bottom. The sealing member is slidably connected to the first connecting hole and detachably connected to the second connecting hole. A buffer spring is sleeved on the outside of the sealing member. The top of the buffer spring is connected to the sealing member, and the bottom of the buffer spring is connected to the bottom of the connecting pipe. When the connecting pipe moves, it drives the buffer spring and the sealing member to move up and down, so that the bottom valve can be engaged and disengaged from the main body.

[0023] Preferably, the bottom valve has a constricted portion, and a downward-facing second protrusion is formed inside the main body, the constricted portion fitting into the second protrusion.

[0024] In some embodiments, the connecting pipe has an oil delivery channel inside, which communicates with the oil outlet; the connecting pipe has a side wall through hole, which communicates with the first oil drain hole; and a filter screen is arranged between the side wall through hole and the first oil drain hole.

[0025] Preferably, the first oil drain holes are evenly distributed in the circumferential direction of the main body, and the second oil drain holes are evenly distributed in the circumferential direction of the upper connector, and the number of the first oil drain holes and the second oil drain holes are the same.

[0026] In some embodiments, the tip of the second V-shaped bevel faces upward; or,

[0027] The tip of the first V-shaped ramp points upward; or,

[0028] The second single-sided inclined plane extends to the lower right as a whole.

[0029] Secondly, embodiments of this application provide a method of using the oil drainer described in any of the technical solutions of the first aspect, the method comprising:

[0030] During oil pumping operations, the sucker rod acts downward on the upper part of the guide head, pushing the guide head, connecting pipe, and bottom valve to move downward along the first guide rail, and the return spring is compressed downward by the connecting pipe;

[0031] When the sucker rod is lifted, the return spring releases its elastic potential energy, pushing the guide head, the connecting pipe, and the bottom valve upward along the first guide rail. The second single-sided inclined surface of the connecting pipe moves along one surface of the first V-shaped inclined surface, causing the connecting pipe to rotate. When the third guide rail is stuck in the first V-shaped inclined surface, the bottom valve separates from the main body.

[0032] In some embodiments, the method of use includes:

[0033] During well workover, the sucker rod acts downward on the upper part of the guide head, pushing the guide head, the connecting pipe, and the bottom valve downward along the first guide rail, and the return spring is compressed downward by the connecting pipe;

[0034] When the sucker rod is lifted, the return spring releases its elastic potential energy, pushing the guide head, the connecting pipe, and the bottom valve upward along the first guide rail. The second single-sided inclined surface of the connecting pipe moves along the first single-sided inclined surface, causing the connecting pipe to rotate. When the second single-sided inclined surface slides out from the first single-sided inclined surface, the third guide rail meshes with the first guide rail and moves upward along the first guide rail. The bottom valve moves upward and engages with the main body.

[0035] In some embodiments, the method of use includes:

[0036] When draining oil, rotate the oil pipe to rotate the upper connector, causing the pin between the upper connector and the main body to break off.

[0037] Continue rotating the oil pipe to drive the upper connector to rotate, and start draining oil when the second drain hole coincides with the first drain hole;

[0038] Furthermore, pressure is applied from the wellhead into the well. When the force acting on the rupture disc reaches the bursting pressure of the rupture disc, the rupture disc ruptures, connecting the first drain hole and the second drain hole, thereby increasing the oil discharge. There are multiple first drain holes, some of which are equipped with rupture discs that block the corresponding first drain holes.

[0039] The beneficial effects of some embodiments of this application are:

[0040] In this application, when the foot valve is engaged with the main body, the crude oil at the bottom of the well cannot be drawn. Therefore, during well workover operations, the second bleed hole can be aligned with the first bleed hole to drain the oil, allowing the well fluid containing crude oil in the tubing to be discharged, for example, into the annular space between the casing and tubing. This prevents a blowout due to excessive bottom-hole pressure during workover operations. When the foot valve is separated from the main body, the crude oil at the bottom of the well can be drawn. This allows the second bleed hole to be aligned with the first bleed hole during normal pumping operations, further reducing bottom-hole pressure and preventing a blowout during normal pumping operations.

[0041] In some embodiments of this application, the filter screen is disposed inside the main body and has screen holes for sand prevention. During oil pumping operations, the filter screen is always in working condition to prevent sand and gravel at the bottom of the well from blocking the oil drain hole.

[0042] In some embodiments of this application, the oil drainer can not only smoothly discharge the well fluid in the tubing to the bottom of the well during well workover operations, but also ensure that a blowout accident is avoided due to excessive bottom pressure during workover operations.

[0043] Other features and advantages of this application will either be set forth in the following description, become apparent from the description, or be learned by practicing specific embodiments of the application. The objectives and other advantages of this application will be realized and obtained through the portion particularly pointed out in the description, claims, and drawings. Attached Figure Description

[0044] The following sections will describe some specific embodiments of this application in detail by way of example and not limitation, with reference to the accompanying drawings. The drawings are used to better understand the present solution and do not constitute a limitation of the present application. The same reference numerals in the drawings indicate the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. Dashed lines indicate perspective of the currently hidden state. In the drawings:

[0045] Figure 1 This is a schematic diagram of the structure of the oil drain device in some embodiments of this application;

[0046] Figure 2 This is a schematic diagram showing the installation relationship of the guide head, connecting pipe, and main body in some embodiments of this application;

[0047] Figure 3 Perspective views of the main body of some embodiments of this application;

[0048] Figure 4 These are cross-sectional views of the main body of some embodiments of this application;

[0049] Figure 5 This is a schematic diagram of the structure of the filter screen tube in some embodiments of this application;

[0050] Figure 6 This is a schematic diagram of the structure of the filter screen tube in some other embodiments of this application;

[0051] Figure 7 This is a schematic diagram of the structure of the header in some embodiments of this application;

[0052] Figure 8 This is a cross-sectional view of the header of some embodiments of this application;

[0053] Figure 9 This is a schematic diagram of the connecting pipe structure in some embodiments of this application;

[0054] Figure 10 This is a cross-sectional view of the connecting pipe in some embodiments of this application;

[0055] Figure 11 This is a schematic diagram of the bottom valve structure in some embodiments of this application;

[0056] Figure 12 This is a flowchart illustrating the usage method of the oil drainer in some embodiments of this application.

[0057] Explanation of key component symbols:

[0058] 01-Oil drainer;

[0059] 1-Main body, 101-First guide rail, 1011-First V-shaped inclined surface, 1012-First single-sided inclined surface, 102-First oil drain hole, 103-First boss, 104-Second boss;

[0060] 2-Upper connector, 201-Second drain hole;

[0061] 3-Filter screen tube, 301-Sieve eye, 3011-Outer opening, 3012-Inner opening, 302-Outer edge;

[0062] 4-Pin;

[0063] 5-Guide head, 501-Oil delivery hole, 502-Second guide rail, 503-Second V-shaped bevel;

[0064] 6-Connecting pipe, 601-Third guide rail, 6011-Second single-sided inclined surface, 602-Side wall through hole, 603-First connecting hole, 604-Oil outlet hole, 605-Oil delivery channel;

[0065] 7-Return spring;

[0066] 8-Cap;

[0067] 9-Fracturing fragments;

[0068] 10-Buffer spring;

[0069] 11-Bottom valve, 1101-Second connecting hole, 1102-Enlarged part, 1103-Constricted part;

[0070] 12-Sealing component. Detailed Implementation

[0071] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings, including many details of the embodiments of this application to aid understanding. The described embodiments are only possible technical implementations of this application and should be considered merely exemplary, not all possible implementations. Similarly, for clarity and conciseness, some descriptions of well-known functions and structures are omitted in the following description.

[0072] Exemplary application scenarios

[0073] Before introducing the technical solutions of this application, we will first introduce exemplary application scenarios of the technical solutions of the embodiments of this application.

[0074] As mentioned above, pull-type and impact-type oil flushers are widely used in oilfields due to their simple structure and practicality. However, as oilfield development enters the mid-to-late stages, the complex and variable downhole conditions lead to a lower success rate for both types of oil flushers. The main reasons are: ① In horizontal wells and highly deviated wells, the large wellbore inclination results in high friction between the rod and tubing, leading to low kinetic energy during rod impact; ② In wells producing sand, situations such as sand burying the pump rod, rod jamming, and rod breakage occur; ③ In heavy oil wells, the produced fluid has high viscosity, resulting in a slow rod drop speed. Furthermore, due to the mechanical characteristics of these two types of oil flushers, the internal sealing device is damaged after one use, making them unusable and thus requiring only one-time use, further increasing operating costs.

[0075] One objective of this application is to solve the problem of difficulty in draining oil when the drain port is blocked by sand during pump inspection operations, and to avoid leakage of a large amount of well fluid in the tubing when the tubing is lifted; another objective of this application is to enable the drain device to have a blowout prevention function during well repair.

[0076] Exemplary technical solution x

[0077] Based on the above considerations, according to the first aspect of this application, an oil drainer is provided, comprising a main body 1, an upper connector 2, a guide head 5, a connecting pipe 6, a return spring 7, and a bottom valve 11.

[0078] like Figure 3 and Figure 4 As shown, the upper end of the main body 1 is provided with a first guide rail 101 protruding from the inner surface of the main body. There are multiple first guide rails 101 and they are distributed at intervals on the inner surface of the main body. The lower end of the first guide rail 101 forms a first V-shaped inclined surface 1011 and a first single-sided inclined surface 1012.

[0079] like Figure 7 and Figure 8 As shown, a second guide rail 502 protruding from the outer surface of the guide head 5 is formed on the outer surface of the guide head. Multiple second guide rails 502 are spaced apart on the outer surface of the guide head. The first guide rail 101 engages with the second guide rail 502 to limit the movement direction of the second guide rail 502 to along the first guide rail 101. A second V-shaped inclined surface 503 is formed at the lower end of the second guide rail 502. Clearly, when the first guide rail 101 engages with the second guide rail 502, the first V-shaped inclined surface 1011 is located outside the second V-shaped inclined surface 503, thus forming a double-layered sawtooth structure.

[0080] like Figure 1 As shown, the connecting pipe 6 is located inside the main body 1, and at least a portion of the guide head 5 is located inside the main body 1; as Figure 9 and Figure 10As shown, a third guide rail 601 protruding from the outer surface of the connecting pipe 6 is formed at the upper end of the connecting pipe. The upper end of the third guide rail 601 has a second single-sided inclined surface 6011. The second single-sided inclined surface 6011 is used to cooperate with the double-layer sawtooth structure. Specifically, the outer part of the second single-sided inclined surface 6011 cooperates with the first V-shaped inclined surface 1011, and the inner part of the second single-sided inclined surface 6011 cooperates with the second V-shaped inclined surface 503. When the second single-sided inclined surface 6011 slides out from the first single-sided inclined surface 1012, the third guide rail 601 meshes with the first guide rail 101 and moves upward along the first guide rail 101. The guide head 5 moves downward under the force of the sucker rod, and the second single-sided inclined surface 6011 slides into the first V-shaped inclined surface 1011 under the action of the second V-shaped inclined surface 503. When the sucker rod acts on the guide head 5 again, the second single-sided inclined surface 6011 slides out from the first single-sided inclined surface 1012 under the action of the second V-shaped inclined surface 503. The third guide rail 601 meshes with the first guide rail 101 and moves upward along the first guide rail 101. The upward movement of the third guide rail 601 drives the bottom valve 11 to move upward at the same time. When the bottom valve 11 is engaged with the main body 1, the crude oil at the bottom of the well cannot be sucked up. At this time, the blowout prevention function starts to work. When the bottom valve 11 is separated from the main body 1, the crude oil at the bottom of the well can be sucked up.

[0081] like Figure 1 As shown, the connecting pipe 6 is connected to the main body 1 via a return spring 7. After the return spring 7 is compressed downwards, it releases its elastic force, pushing the connecting pipe 6 upwards, which in turn drives the guide head 5 upwards. The upward movement of the connecting pipe 6 drives the bottom valve 11 upwards, while the buffer spring 10 makes the bottom valve 11 more smoothly connected to the main body 1 and provides continuous elastic force to make the two more tightly connected.

[0082] like Figure 1 As shown, the upper connector 2 is sleeved on the outside of the main body 1. The main body 1 is provided with a first oil drain hole 102, and the upper connector 2 is provided with a second oil drain hole 201. The rotation of the upper connector 2 drives the second oil drain hole 201 to rotate. When the second oil drain hole 201 coincides with the first oil drain hole 102, the oil drain is opened. When the second oil drain hole 201 is misaligned with the first oil drain hole 102, the oil drain is closed.

[0083] refer to Figure 1 The lower part of the upper connector 2 is flared to accommodate the main body 1, while the upper part of the upper connector 2 is constricted. (Reference) Figure 7 , Figure 8The upper part of the guide head 5 is also constricted to facilitate insertion into the upper part of the upper connector 2. The outer diameter of the guide head 5, including the second guide rail 502, is basically the same as the inner diameter of the upper part of the upper connector 2. This allows the guide head 5 to be straightened when it is inserted into the upper part of the upper connector 2. The second guide rail 502 also reduces the contact area between the guide head 5 and the upper part of the upper connector 2, reducing friction and making it easier to insert.

[0084] As an optional implementation, for example, the sucker rod acts upward on the upper part of the guide head 5, causing the guide head 5 to move upward and extend into the upper part of the upper connector 2. The first guide rail 101 and the second guide rail 502 disengage, and the inner part of the second single-sided inclined surface 6011 disengages from the second V-shaped inclined surface 503. The guide head 5 rotates a certain angle, and then moves downward to re-engage the inner part of the single-sided inclined surface 6011 with the second V-shaped inclined surface 503. During this process, the connecting pipe 6 is actuated to rotate at the same angle as the guide head 5. Subsequently, the second single-sided inclined surface 6011 can be brought into contact with the first single-sided inclined surface 1012 and slid out as needed. As an illustrative example, the rotation of the guide head 5 can be achieved by, for example, by having a vertical guide rail on the upper connector 2. When the guide head 5 extends into the upper connector 2, the vertical guide rail engages with the second guide rail 502. Rotating the oil pipe causes the upper connector 2 to rotate, which in turn causes the guide head 5 to rotate.

[0085] In this application, when the foot valve 11 is engaged with the main body 1, the crude oil at the bottom of the well cannot be extracted. Therefore, during well workover operations, the second drain hole 201 is aligned with the first drain hole 102 to drain the oil, allowing the well fluid containing crude oil in the tubing to be discharged, for example, into the annular space between the tubing and casing. This reduces the amount of crude oil in the wellbore during workover operations, facilitating the process and preventing large amounts of well fluid from being carried to the wellhead when the sucker rod is pulled, thus avoiding environmental pollution. When the foot valve 11 is separated from the main body 1, the crude oil at the bottom of the well can be extracted.

[0086] In some embodiments, the main body 1 and the upper connector 2 are connected by threads, and the pin 4 fixes the main body 1 and the upper connector 2; the upper connector 2 rotates around the main body 1 under the action of external force to cut the pin 4 and release the fixation between the main body 1 and the upper connector 2.

[0087] In some specific implementations, such as Figure 1 As shown, the upper end of the main body 1 has a first reduction portion, and the upper connector 2 has a second reduction portion. Both the first reduction portion and the second reduction portion are provided with threads. The second reduction portion limits the main body 1, allowing blind operation without causing the main body 1 and the upper connector 2 to seize up. The threaded connection also facilitates the rotation of the upper connector 2.

[0088] In some specific embodiments, the upper connector 2 is connected to the oil pipe, and the rotation of the oil pipe drives the upper connector 2 to rotate.

[0089] In some specific embodiments, the upper part of the guide head 5 is in direct contact with the sucker rod of the oil pumping unit, and the sucker rod pushes the guide head 5 to move upward or downward.

[0090] In some embodiments, the number of the first drain holes 102 is multiple, in Figure 3 There are three first drain holes 102. Figure 1 As shown, a rupture disc 9 is provided inside part of the first oil drain hole 102, and the rupture disc 9 blocks the corresponding first oil drain hole 102. The rupture disc 9 should be removable, and the blocked first oil drain hole 102 can be opened as needed. In some specific embodiments, the rupture disc 9 is connected to a pressure cap 8. The pressure cap 8 moves downward under the action of external force, thereby driving the rupture disc 9 to move downward, so that the rupture disc 9 and the corresponding first oil drain hole 102 are more tightly connected. When the force acting on the rupture disc 9 reaches the bursting pressure of the rupture disc 9, the rupture disc 9 ruptures, so that the first oil drain hole 102 is connected to the second oil drain hole 201, increasing the oil drain volume. For example, when the first drain hole 102 and the second drain hole 201 on the main body 1 and the upper connector 2 cannot meet the oil drainage work, pressure can be applied from the wellhead to the well to provide the external force required by the pressure cap 8. When the bursting pressure of the rupture disc is reached, the rupture disc 9 no longer blocks the first drain hole 102, increasing the number of working first drain holes 102 and the number of working second drain holes 201, thereby increasing the amount of oil drained.

[0091] In some embodiments, such as Figure 5 and Figure 6 As shown, the oil drainer 01 also includes a filter screen 3 for sand prevention; the filter screen 3 is connected to the inside of the main body 1, and the filter screen 3 has screen holes 301 for sand prevention. The filter screen 3 blocks the first oil drain hole 102. During normal oil pumping operations, the filter screen 3 is always in working condition to prevent sand and gravel at the bottom of the well from blocking the oil drain hole. The filter screen 3 plays a sand prevention role.

[0092] like Figure 4 As shown, an upward-facing first protrusion 103 is formed inside the main body 1; as Figure 5 and Figure 6 As shown, the filter screen tube 3 has an edge 302 that overlaps the first boss 103. A return spring 7 ensures a better connection between the filter screen tube 3 and the first boss 103, forming a stable mounting structure. The return spring 7 prevents the filter screen tube 3 from detaching from the first boss 103, maintaining the relative fixation of the filter screen tube 3 within the main body 1 and preserving its sand-proof effect.

[0093] In some specific embodiments, the filter screen tube 3 has a certain thickness, which facilitates the arrangement of the opening directions of the outer opening 3011 and the inner opening 3012. Specifically, the sieve eye 301 extends through the filter screen tube 3, and the sieve eye 301 includes an outer opening 3011 formed on the outer surface of the filter screen tube 3, an inner opening 3012 formed on the inner surface of the filter screen tube 3, and an oil passage between the outer opening 3011 and the inner opening 3012. The inner opening 3012 is higher than the outer opening 3011, so that the oil passage from the outside to the inside is generally upward, which can more effectively prevent sand and gravel accumulation. Specifically, the outer opening 3011 can face upward and the inner opening 3012 can face downward.

[0094] like Figure 11 As shown, in some embodiments, the bottom valve 11 is provided with a second connecting hole 1101, the bottom of the connecting pipe 6 is provided with a first connecting hole 603 and an oil outlet hole 604, and the sealing member 12 can be, for example, a bolt, passing through the first connecting hole 603 and the second connecting hole 1101 from top to bottom. The sealing member 12 is slidably connected to the first connecting hole 603, and the sealing member 12 is detachably connected to the second connecting hole 1101, for example, by a threaded connection. A buffer spring 10 is sleeved on the outside of the sealing member 12. The top of the buffer spring 10 is connected to the sealing member 12 by, for example, a bolt nut, and the bottom of the buffer spring 10 is connected to the bottom of the connecting pipe 6. When the connecting pipe 6 moves, it drives the buffer spring 10 and the sealing member 12 to move up and down, so that the bottom valve 11 can be engaged and disengaged from the main body 1. Figure 1 In the middle, the sealing member 12 passes through the first connecting hole 603 from top to bottom and is fixedly connected to the bottom valve 11. The buffer spring 10 is located at the bottom of the connecting pipe 6. The upward movement of the connecting pipe 6 drives the bottom valve 11 to move upward, while the buffer spring 10 makes the bottom valve 11 more stable when it is combined with the main body 1, and provides continuous elastic force to make the two more tightly combined, thereby improving the anti-spraying effect.

[0095] In some specific implementations, such as Figure 11 As shown, the bottom valve 11 has an enlarged portion 1102, which is located below the second connecting hole 1101. The bottom valve 11 has a constricted portion 1103, and a downward-facing second boss 104 is formed inside the main body 1, as shown. Figure 1 As shown, the constricted portion 1103 is fitted into the second boss 104 to achieve a seal between the bottom valve 11 and the main body 1, that is, the bottom valve 11 is combined with the main body 1.

[0096] like Figure 10As shown, in some embodiments, the connecting pipe 6 has an oil delivery channel 605 inside, which communicates with the oil outlet 604; the connecting pipe 6 has a side wall through hole 602, which communicates with the first oil drain hole 102; the filter screen tube 3 is arranged between the side wall through hole 602 and the first oil drain hole 102. Preferably, the first oil drain holes 102 are evenly distributed in the circumferential direction of the main body 1, and the second oil drain holes 201 are evenly distributed in the circumferential direction of the upper connector 2. This facilitates the rotation of the upper connector 2 and allows the second oil drain holes 201 to be aligned with the first oil drain holes 102 more quickly. It should be noted that when the number of first oil drain holes 102 and second oil drain holes 201 is the same and they are evenly distributed in the circumferential direction, all the second oil drain holes 201 can be aligned with the corresponding first oil drain holes 102.

[0097] like Figure 3 and Figure 4 As shown, the tip of the first V-shaped inclined surface 1011 points upwards. Figure 7 and Figure 8 As shown, the tip of the second V-shaped inclined surface 503 points upwards. Figure 9 and Figure 10 As shown, the second single-sided inclined plane 6011 extends to the lower right as a whole.

[0098] Based on the same concept, embodiments of the second aspect of this application also provide a method of using the oil drainer 01 of any of the technical solutions of the first aspect. This method of use also achieves the technical effects of the oil drainer 01 of any of the technical solutions of the first aspect, and will not be elaborated further here.

[0099] In some embodiments, such as Figure 12 The diagram shows a usage method 100, which includes:

[0100] S101, during the oil pumping operation, the sucker rod acts downward on the upper part of the guide head 5, pushing the guide head 5, connecting pipe 6, and bottom valve 11 to move downward along the first guide rail 101, and the return spring 7 is compressed downward by the connecting pipe 6.

[0101] S102, lift the sucker rod, and the return spring 7 releases its elastic potential energy to push the guide head 5, the connecting pipe 6, and the bottom valve 11 to move upward along the first guide rail 101.

[0102] S103, the second single-sided inclined surface 6011 of the connecting pipe 6 moves along one surface of the first V-shaped inclined surface 1011, causing the connecting pipe 6 to rotate. When the third guide rail 601 is stuck in the first V-shaped inclined surface 1011, the bottom valve 11 separates from the main body 1. The bottom valve 11 is in the open state, the blowout preventer is closed, and the crude oil at the bottom of the well enters the oil delivery channel 605 opened inside the connecting pipe 6 through the oil outlet 604. The crude oil at the bottom of the well can be normally drawn, and the oil pumping operation can be carried out normally. During the normal oil pumping operation, the filter screen 3 is always in working state to prevent sand and gravel at the bottom of the well from blocking the drain hole.

[0103] In some embodiments, the method of use includes:

[0104] When performing well workover operations, such as when the well needs to be shut down for workover operations, the sucker rod acts downward on the upper part of the guide head 5, pushing the guide head 5, the connecting pipe 6, and the bottom valve 11 to move downward along the first guide rail 101, and the return spring 7 is compressed downward by the connecting pipe 6.

[0105] When the sucker rod is lifted, the return spring 7 releases its elastic potential energy, pushing the guide head 5, the connecting pipe 6, and the bottom valve 11 upward along the first guide rail 101. The second single-sided inclined surface 6011 of the connecting pipe 6 moves along the first single-sided inclined surface 1012, causing the connecting pipe 6 to rotate. When the second single-sided inclined surface 6011 slides out from the first single-sided inclined surface 1012, the third guide rail 601 meshes with the first guide rail 101 and moves upward along the first guide rail 101. The bottom valve 11 moves upward and engages with the main body 1. That is, the bottom valve 11 is closed, the blowout preventer is activated, crude oil cannot enter the oil outlet 604 and the oil delivery channel 605, the crude oil at the bottom of the well cannot be extracted, the pumping operation stops, and preparation is made for the next well workover operation.

[0106] In some embodiments, the method of use includes:

[0107] When draining oil, rotating the oil pipe causes the upper connector 2 to rotate, causing the pin 4 between the upper connector 2 and the main body 1 to break.

[0108] Continue rotating the oil pipe to drive the upper connector 2 to rotate, and start draining oil when the second drain hole 201 coincides with the first drain hole 102.

[0109] In some embodiments, pressure is applied from the wellhead into the well. When the force acting on the rupture disc 9 reaches the bursting pressure, the rupture disc 9 ruptures, causing the first drain hole 102 to connect with the second drain hole 201, increasing the number of working first drain holes 102 and second drain holes 201, and increasing the amount of oil drained.

[0110] The blowout and sand-prevention drain device 01 of this application can not only smoothly discharge the well fluid in the tubing to the bottom of the well during well workover operations, but also ensure that blowout accidents are avoided due to excessive bottom pressure during workover operations.

[0111] It should be noted that, in the absence of conflict, the various embodiments and features in each embodiment of this application can be combined with each other. This application provides some combined embodiments to illustrate possible combinations.

[0112] Example 1:

[0113] An oil drain device for oil pipes that prevents blowouts and sand. It includes: a first guide rail 101 inside the upper end of a main body 1, with a first V-shaped inclined surface 1011 at the lower end of the guide rail inside the main body 1; a second guide rail 502 outside the guide head 5 that meshes with the inside of the main body 1, with a second V-shaped inclined surface 503 at the lower end of the second guide rail 502 outside the guide head 5; a connecting pipe 6 connected to the lower end of the guide head 5; a third guide rail 601 on the outer side of the upper end of the connecting pipe 6, with a second single-sided inclined surface 6011 tilting to the right at the upper end of the third guide rail 601; the connecting pipe 6 and the main body 1 interact via a return spring 7, which pushes the guide head 5 and the connecting pipe 6 upwards inside the main body 1; a filter screen tube 3 installed between the return spring 7 and the main body 1; a bottom valve 11 connected to the bottom end of the connecting pipe 6 by bolts, with a buffer spring 10 sleeved in the middle of the bolts; an upper connector 2 connected to the upper end of the main body 1 by threads; and a pin 4 between the main body 1 and the upper connector 2. During oil pumping operations, the filter screen can effectively prevent sand and gravel from adhering to the first drain hole 102 and the second drain hole 201.

[0114] During oil drainage, the first drain hole 102 and the second drain hole 201 can be opened smoothly, allowing the oil drainage work to proceed smoothly. At the same time, the bottom valve 11 is closed, which can prevent blowout accidents during well workover operations.

[0115] It should be noted that:

[0116] The terms "first," "second," etc., used in this application are used to distinguish similar objects, not to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate, and the objects distinguished by "first," "second," etc., are usually of the same class, without limiting the number of objects; for example, the first object can be one or more. In this application, "or / and," "and / or," and "or" indicate that the object is at least one of them, while "or" indicates that the object is one of them.

[0117] In this application, "up," "down," "front," "back," "vertical," "high," and "low" are used in the context of... Figure 1The description is provided as a baseline and is primarily intended to better describe this application and its embodiments, and is not intended to limit the indicated devices, elements, or components to having a particular orientation, or to be constructed and operated in a particular orientation. The term "a plurality of" should be understood as two or more.

[0118] It should be understood that the terms "comprising" and "including" as used in this application indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0119] The embodiments of this application have been described in detail above with reference to the accompanying drawings. It should be noted that implementations not illustrated or described in the drawings or the main text of the specification are forms known to those skilled in the art and have not been described in detail.

[0120] The above description is merely a partial embodiment of this application and an explanation of the technical principles employed, and is not intended to limit this application in any way. Those skilled in the art should understand that the scope of disclosure in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described concept. For example, technical solutions formed by substituting the above features with, but not limited to, technical features disclosed in this application that have similar functions are also within the scope of protection of this application.

Claims

1. An oil drainer (01), characterized in that, Includes main body (1), upper connector (2), guide head (5), connecting pipe (6), reset spring (7), and bottom valve (11); The upper end of the main body (1) is provided with a first guide rail (101) protruding from the inner surface of the main body. The number of the first guide rails (101) is multiple and they are distributed at intervals on the inner surface of the main body. The lower end of the first guide rail (101) is formed with a first V-shaped inclined surface (1011) and a first single-sided inclined surface (1012). The guide head (5) has a second guide rail (502) protruding from its outer surface. The second guide rail (502) is multiple and spaced apart on the outer surface of the guide head. The first guide rail (101) meshes with the second guide rail (502) to limit the movement direction of the second guide rail (502) to be along the first guide rail (101). The lower end of the second guide rail (502) has a second V-shaped inclined surface (503). The first V-shaped inclined surface (1011) is located outside the second V-shaped inclined surface (503). The connecting pipe (6) is located inside the main body (1), and at least a portion of the guide head (5) is located inside the main body (1). A third guide rail (601) protruding from the outer surface of the connecting pipe (6) is formed at the upper end of the connecting pipe. The upper end of the third guide rail (601) has a second single-sided inclined surface (6011). The outer portion of the second single-sided inclined surface (6011) engages with the first V-shaped inclined surface (1011) and with the first single-sided inclined surface (1012). The inner portion of the second single-sided inclined surface (6011) engages with the second V-shaped inclined surface (1012). 503) cooperate; the guide head (5) moves downward under the force of the sucker rod, and the second single-sided inclined surface (6011) slides into the first V-shaped inclined surface (1011) under the action of the second V-shaped inclined surface (503). When the sucker rod acts on the guide head (5) again, the second single-sided inclined surface (6011) slides out from the first single-sided inclined surface (1012) under the action of the second V-shaped inclined surface (503). The third guide rail (601) meshes with the first guide rail (101) and moves upward along the first guide rail (101). The connecting tube (6) is connected to the main body (1) through a return spring (7). After the return spring (7) is compressed downward, the return spring (7) releases elastic potential energy to push the connecting tube (6) upward, thereby driving the guide head (5) upward. The upper connector (2) is sleeved on the outside of the main body (1). The main body (1) is provided with a first oil drain hole (102), and the upper connector (2) is provided with a second oil drain hole (201). The upper connector (2) rotates, causing the second oil drain hole (201) to rotate. When the second oil drain hole (201) coincides with the first oil drain hole (102), the oil drain is opened. When the second oil drain hole (201) is misaligned with the first oil drain hole (102), the oil drain is closed. The main body (1) and the upper connector (2) are connected by threads, and the pin (4) fixes the main body (1) and the upper connector (2); the upper connector (2) rotates around the main body (1) under the action of external force to cut the pin (4) and release the fixation between the main body (1) and the upper connector (2); The upper end of the main body (1) has a first reduction portion, and the upper connector (2) has a second reduction portion. Both the first reduction portion and the second reduction portion are provided with threads, and the second reduction portion limits the main body (1). The upper connector (2) is connected to the oil pipe, and the rotation of the oil pipe drives the upper connector (2) to rotate. The upper part of the guide head (5) is in direct contact with the sucker rod, and the sucker rod pushes the guide head (5) to move upward or downward.

2. The oil drainer (01) according to claim 1, characterized in that: There are multiple first oil drain holes (102), and some of the first oil drain holes (102) are provided with rupture discs (9), which block the corresponding first oil drain holes (102); The rupture disc (9) is connected to a pressure cap (8). The pressure cap (8) moves downward under the action of external force, thereby driving the rupture disc (9) to move downward, so that the rupture disc (9) and the corresponding first drain hole (102) are more tightly connected.

3. The oil drainer (01) according to claim 1, characterized in that, It also includes filter screen tubes (3); The filter screen tube (3) is connected inside the main body (1), and the filter screen tube (3) has a screen hole (301) for sand prevention. The filter screen tube (3) blocks the first oil drain hole (102). The main body (1) has an upward first protrusion (103) inside, and the filter screen tube (3) has an edge (302) which overlaps the first protrusion (103) and the filter screen tube (3) is better connected to the first protrusion (103) by the reset spring (7). The sieve hole (301) extends through the filter screen tube (3). The sieve hole (301) includes an outer opening (3011) formed on the outer surface of the filter screen tube (3) and an inner opening (3012) formed on the inner surface of the filter screen tube (3). The inner opening (3012) is higher than the outer opening (3011).

4. The oil drainer (01) according to claim 1, characterized in that: The bottom valve (11) is provided with a second connection hole (1101). The bottom of the connecting pipe (6) is provided with a first connecting hole (603) and an oil outlet hole (604). The sealing member (12) passes through the first connecting hole (603) and the second connecting hole (1101) from top to bottom. The sealing member (12) is slidably connected to the first connecting hole (603) and detachably connected to the second connecting hole (1101). A buffer spring (10) is sleeved on the outside of the sealing member (12). The top of the buffer spring (10) is connected to the sealing member (12), and the bottom of the buffer spring (10) is connected to the bottom of the connecting pipe (6). When the connecting pipe (6) moves, it drives the buffer spring (10) and the sealing member (12) to move up and down, so that the bottom valve (11) can be combined and separated from the main body (1). The bottom valve (11) has a constricted portion (1103), and a downward-facing second boss (104) is formed inside the main body (1). The constricted portion (1103) is fitted into the second boss (104).

5. The oil drainer (01) according to claim 4, characterized in that: The connecting pipe (6) has an oil delivery channel (605) inside, which is connected to the oil outlet (604); the connecting pipe (6) has a side wall through hole (602), which is connected to the first oil drain hole (102); the filter screen tube (3) is arranged between the side wall through hole (602) and the first oil drain hole (102); The first oil drain hole (102) is evenly distributed in the circumferential direction of the main body (1), and the second oil drain hole (201) is evenly distributed in the circumferential direction of the upper connector (2). The number of the first oil drain hole (102) and the second oil drain hole (201) are the same.

6. The oil drainer (01) according to claim 1, characterized in that: The tip of the second V-shaped inclined plane (503) points upward; or, The tip of the first V-shaped inclined plane (1011) points upward; or, The second single-sided inclined plane (6011) extends to the lower right as a whole.

7. A method of using the oil drainer (01) according to any one of claims 1-6, characterized in that, include: When the oil pumping operation is carried out, the sucker rod acts downward on the upper part of the guide head (5), pushing the guide head (5), connecting pipe (6), and bottom valve (11) to move downward along the first guide rail (101), and the return spring (7) is compressed downward by the connecting pipe (6); Lifting the sucker rod causes the return spring (7) to release its elastic potential energy, pushing the guide head (5), the connecting pipe (6), and the bottom valve (11) upward along the first guide rail (101). The second single-sided inclined surface (6011) of the connecting pipe (6) moves along one surface of the first V-shaped inclined surface (1011), causing the connecting pipe (6) to rotate. When the third guide rail (601) is stuck in the first V-shaped inclined surface (1011), the bottom valve (11) separates from the main body (1).

8. The method of use according to claim 7, characterized in that, Also includes: When performing well repair operations, the sucker rod acts downward on the upper part of the guide head (5), pushing the guide head (5), the connecting pipe (6), and the bottom valve (11) to move downward along the first guide rail (101), and the return spring (7) is compressed downward by the connecting pipe (6); Lifting the sucker rod releases the elastic potential energy of the return spring (7), which pushes the guide head (5), the connecting pipe (6), and the bottom valve (11) upward along the first guide rail (101). The second single-sided inclined surface (6011) of the connecting pipe (6) moves along the first single-sided inclined surface (1012), causing the connecting pipe (6) to rotate. When the second single-sided inclined surface (6011) slides out from the first single-sided inclined surface (1012), the third guide rail (601) meshes with the first guide rail (101) and moves upward along the first guide rail (101). The bottom valve (11) moves upward and combines with the main body (1).

9. The method of use according to claim 8, characterized in that, Also includes: When draining oil, rotate the oil pipe to drive the upper connector (2) to rotate, causing the pin (4) between the upper connector (2) and the main body (1) to break off; Continue to rotate the oil pipe to drive the upper connector (2) to rotate. When the second drain hole (201) coincides with the first drain hole (102), the oil drain will be opened. Furthermore, pressure is applied from the wellhead into the well. When the force acting on the rupture disc (9) reaches the rupture pressure, the rupture disc (9) ruptures, connecting the first drain hole (102) with the second drain hole (201), thereby increasing the amount of oil drained. There are multiple first drain holes (102), and some of the first drain holes (102) are equipped with the rupture disc (9), which blocks the corresponding first drain hole (102).

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