RD multifunctional valve suitable for offshore high-temperature and high-pressure formation testing operation

Abstract

The invention provides an RD multifunctional valve suitable for offshore high-temperature and high-pressure formation testing operation. The multifunctional valve comprises an upper connector, a mandrel and a connecting connector. The locking block mechanism is arranged between the upper joint and the mandrel; the upper pressure driving mechanism is arranged on the lower side of the locking block mechanism; the upper end of the spring mechanism is limited on the upper pressure driving mechanism, and the lower end is connected with the upper ball valve mechanism; the upper ball valve mechanism is arranged between the spring mechanism and the upper bypass mechanism in a manner of moving up and down; the upper bypass mechanism is connected between the upper ball valve mechanism and the lower circulating mechanism; a lower circulation mechanism; the lower pressure driving mechanism is positioned between the lower circulating mechanism and the lower ball valve mechanism; and the lower ball valve mechanism is positioned between the lower pressure driving mechanism and the lower joint. The device can carry out multiple upper oil pipe pressure testing operations, is provided with a hydraulic bypass mechanism, can close a circulation hole after pressure testing is completed, does not communicate with an annular space any more, and keeps the tool in a full-bore state.

Description

Technical Field

[0001] This invention relates to the field of drill pipe formation testing technology, and more specifically, to an RD multi-functional valve suitable for offshore high-temperature and high-pressure formation testing operations. Background Technology

[0002] Formation testing refers to the testing of oil and gas reservoirs during drilling or after well completion to obtain various parameters of the formation and fluids under dynamic conditions. This allows for timely and accurate evaluation of the producing layer, interpreting its characteristics and productivity. Specifically, testing tools (including pressure and temperature recorders, packers, and test valves) are lowered into the test section using drill pipe or tubing. The packer's rubber sleeve expands and sets on the upper part of the test layer, isolating other sections and drilling fluid from it. Then, controlled from the surface, the bottomhole test valve is opened, allowing the fluid from the test layer to flow into the tubing string through the screen pipe's channels and the test valve until it reaches the surface.

[0003] The most commonly used tool for pressure testing upper tubing is the valve plate type (specifically, test fluid is introduced from the top of the testing tool to check the sealing pressure between various connections and the overall pressure of the borehole). The maximum test pressure is 70 MPa, and after multiple pressure tests, the sealing effect deteriorates as impurities accumulate between the sealing surfaces. When circulation operations are required (specifically, the circulation of test fluid within the circulation port mechanism to remove downhole impurities), it needs to be used in conjunction with other tools. These tools have relatively limited functions; for example, the pressure testing tool can only perform its own pressure testing, and the circulation tool can only perform circulation operations within the well. Multiple tools are usually required, such as changing the circulation port mechanism after the pressure test for further circulation. Tool operation is relatively complex, extending the overall operation cycle and affecting the downhole sealing performance, thus increasing operating costs. Summary of the Invention

[0004] In view of this, the present invention proposes an RD multi-functional valve suitable for offshore high-temperature and high-pressure formation testing operations, aiming to solve the above problems. This tool can perform upper tubing pressure testing operations, and can also perform multiple circulation operations before and after pressure testing. In case of emergency, it can perform reverse circulation well killing operations. At the same time, after the pressure test is completed, it can close the circulation hole, no longer communicate with the annulus, and keep the tool in full-bore state, so that other operations can be carried out subsequently.

[0005] This invention proposes an RD multi-functional valve suitable for high-temperature and high-pressure formation testing operations at sea. The multi-functional valve includes: an upper connector (1), a spindle (3), a connecting spindle (18), a connecting connector (20), and a lower connector (39) arranged sequentially; wherein the direction from the upper connector (1) to the lower connector (39) is from top to bottom; a locking block mechanism, which is disposed and connected between the upper connector (1) and the spindle (3), for locking the spindle (3) onto the upper connector (1) after the spindle (3) has moved upward by a predetermined stroke relative to the upper connector (1); an upper pressure drive mechanism, disposed below the locking block mechanism and connected to the locking block mechanism, and the upper pressure drive mechanism is sleeved on... The outer periphery of the mandrel (3) is used to open the upper pressure drive mechanism and communicate with the annular pressure when the annular pressure is greater than or equal to the first preset pressure, and drive the mandrel (3) to move upward under the action of the annular pressure; the spring mechanism is coaxially mounted on the mandrel (3), with the upper end limited to the upper pressure drive mechanism and the lower end connected to the upper ball valve mechanism. The spring mechanism acts on the upper ball valve mechanism to make the upper ball valve mechanism initially in the closed position. When the pump is turned on, the upper ball valve mechanism compresses the spring mechanism so that the upper ball valve mechanism as a whole can move upward. During the pressure test, the spring mechanism resets, the upper ball valve mechanism as a whole resets, and the upper bypass mechanism is closed; the upper ball valve mechanism is set on the spring mechanism in a way that allows it to move up and down. Between the upper bypass mechanism and the lower circulation mechanism, the upper part of the multi-functional valve is sealed to conduct an upper pressure test, and opens under the action of the mandrel (3) when the mandrel (3) moves upward, realizing the upper passage and then performing circulation operation; the upper bypass mechanism is connected between the upper ball valve mechanism and the lower circulation mechanism, initially in a closed state, and when the downhole pressure is greater than or equal to the threshold, it drives the upper ball valve mechanism to move upward, thereby opening the upper bypass mechanism so that the fluid in the lower part of the upper ball valve mechanism can flow along the upper bypass mechanism to the upper part of the upper ball valve mechanism, realizing upper bypass; the lower circulation mechanism is located between the upper bypass mechanism and the lower pressure drive mechanism, and is used to connect or disconnect the annulus and the passage. The system includes a connecting channel between the annulus and the through-hole, allowing fluid to circulate through this channel when it is open. A lower pressure drive mechanism, located between the lower circulation mechanism and the lower ball valve mechanism, is used to apply annulus pressure to the lower circulation mechanism when the annulus pressure is greater than or equal to a second preset pressure, thereby cutting off the connecting channel between the annulus and the through-hole. The second preset pressure is greater than the first preset pressure. The lower ball valve mechanism, located between the lower pressure drive mechanism and the lower connector, is initially closed to block the lower part of the multi-functional valve, allowing fluid to flow upwards. It opens when the lower circulation mechanism cuts off the connecting channel between the annulus and the through-hole, achieving full-bore operation of the valve body.

[0006] Furthermore, the aforementioned RD multi-functional valve suitable for offshore high-temperature and high-pressure formation testing operations includes a locking mechanism comprising: a connecting outer cylinder (2) sleeved on the outer periphery of the spindle (3), wherein the connecting outer cylinder (2) is connected to the upper connector (1), and there is a gap between the upper end of the connecting outer cylinder (2) and the upper connector (1) along the axial direction of the upper connector (1); a plurality of arc-shaped locking blocks (28) arranged along the axial direction of the spindle (3) at the gap between the upper end of the connecting outer cylinder (2) and the upper connector (1), and arranged radially between the spindle (3) and the connecting outer cylinder (2), wherein the plurality of arc-shaped locking blocks (28) are arranged at intervals along the circumferential direction of the spindle (3); and a tension spring (27). The mandrel (3) is fitted around the outer periphery of each of the arc-shaped locking blocks (28) to apply an inner radial force to the arc-shaped locking blocks (28); the mandrel (3) has an arc-shaped locking groove (3a) on its outer peripheral wall that corresponds to and is adapted to each of the arc-shaped locking blocks (28). When the mandrel (3) moves to the position where the arc-shaped locking groove (3a) is adapted to the arc-shaped locking block (28), each of the arc-shaped locking blocks (28) can move towards the axis of the mandrel (3) under the action of the tension spring (27) so that part of the arc-shaped locking block (28) is locked in the corresponding arc-shaped locking groove (3a), and part of it is limited and locked between the connecting outer cylinder (2) and the upper connector (1) to achieve the locking of the mandrel (3).

[0007] Furthermore, the aforementioned RD multi-functional valve suitable for offshore high-temperature and high-pressure formation testing operations includes an upper pressure drive mechanism comprising: a rupture disc outer cylinder (4), sleeved on the outer periphery of the mandrel (3), with an upper drive channel (101) between the rupture disc outer cylinder (4) and the mandrel (3), and one end of the rupture disc outer cylinder (4) connected to the connecting outer cylinder (2); and a shear pin (29), disposed between the rupture disc outer cylinder (4) and the mandrel (3), with both ends connected to the rupture disc outer cylinder (4) and the mandrel (3) respectively, for use... When the spindle (3) moves relative to the outer cylinder (4) of the rupture disc under the action of external force, it can be sheared; the rupture disc (30) is provided on the outer cylinder (4) of the rupture disc and is used to break when the annular pressure is greater than or equal to the first preset pressure, so that the fluid can enter the upper drive channel (101) from the rupture hole of the rupture disc (30) to achieve communication with the annular pressure, and can drive the spindle upward and shear the shear pin (29); the seat cap (32) is provided at the lower end of the spindle (3) and is used to drive the upper ball valve mechanism to move upward and open.

[0008] Furthermore, the RD multi-functional valve applicable to marine high-temperature and high-pressure formation testing operations has a spring mechanism comprising: a spring (6), a split spring sleeve (8), and a spring retaining ring (7) fitted around the spring sleeve (8).

[0009] Furthermore, the aforementioned RD multi-functional valve suitable for high-temperature and high-pressure formation testing operations at sea includes an upper ball valve mechanism comprising: a ball valve outer cylinder (5); a differential piston (9) disposed inside the ball valve outer cylinder (5); and a connector (10) disposed below the differential piston (9). The bottom end of the connector (10) is sequentially connected to an upper operating pin (11), a first upper seat ring (12), a C-shaped sleeve (13), and a first lower seat ring (14). Both ends of the C-shaped sleeve (13) are respectively connected to the first upper seat ring (12) and the first lower seat ring (14) for tightening the first upper seat ring. The upper ball valve assembly (25) is rotatably disposed on the inner circumference of the upper ball valve assembly (12) and the lower ball valve assembly (14). The upper operating pin (11) is also connected to the first ball valve assembly (25) and is used to drive the first ball valve assembly (25) to rotate when the upper operating pin (11) moves up and down with the connector (10) and the differential piston (9), so that the first ball valve assembly (25) can be opened or closed, thereby realizing the conduction and cut-off of the upper and lower passages of the first ball valve assembly (25).

[0010] Furthermore, the above-mentioned RD multi-functional valve applicable to marine high temperature and high pressure formation testing operations, the upper bypass mechanism includes: a limiting sleeve (19) connected to the first lower seat ring (14) of the upper ball valve mechanism, the limiting sleeve (19) being sleeved on the outer periphery of the connecting spindle (18), and the outer wall of the connecting spindle (18) having a retaining ring (17) protruding therefrom, for limiting the travel of the limiting sleeve (19) as it moves with the first lower seat ring (14);

[0011] A retaining sleeve (15) is disposed on the upper side of the limiting sleeve (19) and sandwiched between the connecting spindle (18) and the first lower seat ring (14); the connecting spindle (18) and the retaining sleeve (15) are provided with corresponding first bypass holes (102), and the first lower seat ring (14) is provided with a first bypass hole (102), and the first upper seat ring (12) is provided with a second bypass hole (12a). The first bypass hole (102) on the first lower seat ring (14) and the first bypass hole (102) on the retaining sleeve (15) are arranged opposite to each other, so that when the limiting sleeve (19) moves upward to the retaining ring (17), the retaining sleeve (15) and the first lower seat ring (14) move synchronously to the first bypass hole (102) on the first lower seat ring (14) and the first bypass hole (12a) on the retaining sleeve (15). 02) All of them are directly opposite to the first bypass hole (102) on the connecting mandrel (18), so that the fluid can pass through the first bypass hole (102) on the connecting mandrel (18), the first bypass hole (102) on the sleeve (15) and the first bypass hole (102) on the first lower seat ring (14) in sequence, enter the gap between the first lower seat ring (14) and the outer cylinder of the ball valve (5), and flow upward from the second bypass hole (12a) to the upper part of the first ball valve assembly (25) to form a bypass channel. After the first lower seat ring (14) is reset with the differential piston (9), the first bypass hole (102) on the first lower seat ring (14) and the sleeve (15) are misaligned with the first bypass hole (102) on the connecting mandrel (18), so that the bypass channel is closed.

[0012] Furthermore, the RD multi-functional valve applicable to marine high-temperature and high-pressure formation testing operations, wherein the lower circulation mechanism includes: a circulation outer cylinder (21) connected to the connecting joint (20); a circulation mandrel (22) disposed inside the circulation outer cylinder (21), wherein a shearing pin (29) capable of shearing is provided between the circulation mandrel (22) and the circulation outer cylinder (21), and wherein aligned circulation holes (103) are provided on both the circulation outer cylinder (21) and the circulation mandrel (22).

[0013] Furthermore, the RD multi-functional valve applicable to marine high-temperature and high-pressure formation testing operations, wherein the lower pressure mechanism includes: a lower drive channel (104), disposed between the outer circulation cylinder (21) and the circulation mandrel (22); and a rupture disc (30), disposed on the outer circulation cylinder (21), used to break the annular pressure when it is greater than or equal to a second preset pressure, so that fluid can enter the lower drive channel (104) from the rupture hole of the rupture disc (30), thereby achieving communication with the annular pressure, and being able to drive the circulation mandrel (22) downward and shear the shear pin (29) between the outer circulation cylinder (21) and the circulation mandrel (22).

[0014] Furthermore, the RD multifunctional valve applicable to high-temperature and high-pressure formation testing operations at sea, wherein the lower ball valve mechanism includes: a connecting claw (26), a lower operating pin (35), a second upper seat ring (36), and a second lower seat ring (38) connected in sequence to the circulating mandrel (22), the lower end of the second lower seat ring (38) being connected to the lower connector (39); a second ball valve assembly (37), which is rotatably disposed on the inner circumference of the second upper seat ring (36) and the second lower seat ring (38), wherein the lower operating pin (35) is also connected to the second ball valve assembly (37), and is used to drive the second ball valve assembly (37) to rotate when the lower operating pin (35) moves downward with the connecting claw (26), so that the second ball valve assembly (37) opens or closes, thereby realizing the through diameter or cut-off diameter of the circulating mandrel (22) and the lower connector (39).

[0015] The RD multi-functional valve provided by this invention is suitable for high-temperature and high-pressure formation testing operations at sea. After a single well run, it can perform upper tubing pressure testing, with a maximum test pressure of 103.5 MPa. It features a built-in hydraulic bypass mechanism; when the downhole pressure reaches 0.92 MPa, the upper bypass mechanism opens, reducing downhole resistance. In emergencies, it can perform reverse circulation well control. Because the pump operation is a dynamic process, the sealing assembly crosses the bypass hole multiple times. Through the bidirectional spring-energy-storing sealing assembly, it can seal against bidirectional absolute pressures of 103.5 MPa. Testing has shown excellent sealing performance and stable sealing capabilities. After the pressure test is completed, the annulus is pressurized to break the upper rupture disc, causing the upper ball valve mechanism to lock and open, allowing for forward and reverse circulation operations. After the cycle operation is completed, the annulus is pressurized. Under the action of the lower pressure drive mechanism, the lower circulation mechanism closes, cutting off communication with the annulus. The lower ball valve mechanism opens, and the tool is now in full-bore condition, ready for further operations. This RD multi-functional valve solves the problems of current tools having a simple structure, complex operation, and prolonged operation cycles, while also affecting the tool's downhole sealing and increasing operating costs. It also allows for flexible selection of different operational procedures. Attached Figure Description

[0016] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0017] Figure 1 This is a schematic diagram of a portion of the RD multi-functional valve for offshore high-temperature and high-pressure formation testing operations provided in an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of another part of the RD multi-functional valve for offshore high-temperature and high-pressure formation testing operations provided in an embodiment of the present invention;

[0019] Figure 3 For the present invention Figure 1 Enlarged view of the structure at point A in the middle;

[0020] Figure 4 For the present invention Figure 1 Enlarged view of the structure at point B in the middle;

[0021] Figure 5 For the present invention Figure 1 Enlarged view of the structure at point C;

[0022] Figure 6 For the present invention Figure 1 Enlarged view of the structure at point D;

[0023] Figure 7 For the present invention Figure 1 Enlarged view of the structure at point E in the middle;

[0024] Figure 8 For the present invention Figure 2 Enlarged view of the structure at point F in the middle;

[0025] Figure 9 For the present invention Figure 2 Enlarged view of the structure at point G in the middle;

[0026] Figure 10 For the present invention Figure 2 Enlarged view of the structure at point H in the middle;

[0027] Figure 11 For the present invention Figure 2 Enlarged view of the structure at point I in the middle;

[0028] Figure 12 A schematic diagram of the structure of the tension spring, arc-shaped locking block, and mandrel provided in an embodiment of the present invention;

[0029] Figure 13 This is a schematic diagram of the ball valve assembly provided in an embodiment of the present invention;

[0030] Figure 14 This is a schematic diagram of the structure of the operating pin provided in an embodiment of the present invention;

[0031] Figure 15 This is a connection structure diagram of the upper ball valve mechanism provided in an embodiment of the present invention;

[0032] Explanation of reference numerals in the attached drawings: 31 - rectangular sealing ring, (40-51) - support seal, (52-60) - O-ring. Detailed Implementation

[0033] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0034] See Figures 1 to 15 This illustrates a preferred structure of an RD multi-functional valve for offshore high-temperature and high-pressure formation testing operations provided by an embodiment of the present invention. As shown in the figure, the RD multi-functional valve includes: an upper connector 1 (which is the upper end of the entire valve), a spindle 3, a connecting spindle 18, a connecting connector 20, and a lower connector 39 arranged sequentially. That is, in this embodiment, the arrangement direction from the upper connector 1 to the connecting connector 20 is from top to bottom. Figure 1 The vertical direction shown also includes, based on this structure:

[0035] Locking mechanism ( Figure 1 Part A is configured and connected between the upper connector 1 and the spindle 3. After the spindle 3 moves upwards relative to the upper connector 1 by a preset stroke, it is locked, i.e., the spindle 3 is locked to the upper connector 1, so that the upper ball valve mechanism can be locked in the open state, allowing the upper passage of the RD multi-functional valve to open and thus perform cyclic operation. The preset stroke can be determined according to actual conditions; in this embodiment, the preset stroke is a fixed value after the RD multi-functional valve is manufactured. The passage refers to the internal cavity along the diameter direction of the RD multi-functional valve.

[0036] In this embodiment, as Figure 3 ,and Figure 12As shown, the locking mechanism includes: a connecting outer cylinder 2, multiple arc-shaped locking blocks 28, a tension spring 27, and an arc-shaped locking groove 3a; wherein, the connecting outer cylinder 2 is sleeved on the outer periphery of the spindle 3, and the connecting outer cylinder 2 is connected to the upper connector 1, and there is a gap between the upper end of the connecting outer cylinder 2 and the upper connector 1 along the axial direction of the upper connector 1; multiple arc-shaped locking blocks 28 are arranged along the axial direction of the spindle 3 at the gap between the upper end of the connecting outer cylinder 2 and the upper connector 1, and are arranged radially between the spindle 3 and the connecting outer cylinder 2, and the multiple arc-shaped locking blocks 28 are arranged at intervals along the circumference of the spindle 3; A tension spring 27 is sleeved on the outer periphery of each of the arc-shaped locking blocks 28 to apply an inward radial force to the arc-shaped locking blocks 28. The outer peripheral wall of the spindle 3 is provided with arc-shaped locking grooves 3a that correspond one-to-one with and are adapted to the arc-shaped locking blocks 28. When the spindle 3 moves to the position where the arc-shaped locking grooves 3a are adapted to the arc-shaped locking blocks 28, each of the arc-shaped locking blocks 28 can move towards the axis of the spindle 3 under the action of the tension spring 27, so that part of the arc-shaped locking block 28 is locked in the corresponding arc-shaped locking groove 3a, and part is limited and locked between the connecting outer cylinder 2 and the upper connector 1, thereby realizing the locking of the spindle 3.

[0037] Specifically, the arc-shaped locking blocks 28 are fitted to the outer circumferential surface of the spindle 3 along the circumferential spacing, such as... Figure 12 As shown, a tension spring 27 is wrapped around the outer wall of the plurality of arc-shaped locking blocks 28. The tension spring 27 is specifically a ring structure. Preferably, each arc-shaped locking block 28 has a limiting groove for embedding the tension spring 27 on its outer circumferential surface. An annular locking groove 3a for embedding the arc-shaped locking block 28 is formed on the lower circumferential surface of the spindle 3 located on the arc-shaped locking block 28. A connecting outer cylinder 2 is also wrapped around the outer wall of the spindle 3. It is fixedly connected to the upper connector 1 and limits the arc-shaped locking blocks 28. Preferably, the connecting outer cylinder 2 and the upper connector 1 can be connected by threads. After connection, the upper end of the connecting outer cylinder 2 and the stepped surface of the inner wall of the upper connector 1 together clamp and limit the plurality of arc-shaped locking blocks 28. Preferably, as Figure 3 As shown, the inner wall of the connecting outer cylinder 2 is also provided with a limiting step 2a for limiting the mandrel 3, that is, a first step 2a for limiting the mandrel 3 is also provided on the inner wall of the connecting outer cylinder 2. Among them, from Figure 3 At the initial position, the axial distance between the annular locking groove 3a and the arc-shaped locking block 28 is the preset stroke.

[0038] The working principle of the locking block mechanism is as follows: Under the upward drive of the annular pressure on the spindle 3, the spindle 3 moves upward, and the annular locking groove 3a on its outer circumference corresponds to multiple arc-shaped locking blocks 28. Under the force of the tension spring 27 contracting towards the shaft center, the multiple circumferential arc-shaped locking blocks 28 are embedded into the annular locking groove 3a. Some of the arc-shaped locking blocks 28 are embedded in the annular locking groove 3a, and some are set on the right side of the upper connector 1, realizing limit locking. Figure 4As shown, the outer circumferential surface of the mandrel 3 has a second step 3b, which contacts and limits the first step 2a on the outer wall of the connecting outer cylinder 2, thus achieving relative positioning between the mandrel 3 and the connecting outer cylinder 2. The annular pressure refers to the liquid pressure flowing into the annular space between the outer circumference of the valve and the sleeve outside the valve.

[0039] Upper pressure drive mechanism ( Figure 1 Part B), the upper part is a locking block mechanism, located below the locking block mechanism, with its upper end connected to the locking block mechanism. The upper pressure drive mechanism is sleeved on the outer circumference of the mandrel 3. When the annular pressure is greater than or equal to a first preset pressure, the upper pressure drive mechanism opens and communicates with the annular pressure, driving the mandrel 3 upward under the action of the annular pressure. Specifically, the upper pressure drive mechanism is located below the locking block mechanism and sleeved on the outer circumference of the mandrel, with the locking block mechanism at its upper part, and finally communicates with the annular pressure to drive the mandrel 3 upward.

[0040] In this embodiment, as Figure 4 As shown, the upper pressure drive mechanism includes: a rupture disc outer cylinder 4, a shear pin 29, a rupture disc 30, and a seat cap 32; wherein, the rupture disc outer cylinder 4 is sleeved on the outer periphery of the spindle 3, and an upper drive channel 101 is provided between the rupture disc outer cylinder 4 and the spindle 3, and one end of the rupture disc outer cylinder 4 is connected to the connecting outer cylinder 2; the shear pin 29 is disposed between the rupture disc outer cylinder 4 and the spindle 3, and both ends are respectively connected to the rupture disc outer cylinder 4 and the spindle 3, for shearing when the spindle 3 moves relative to the rupture disc outer cylinder 4 under the action of external force; the rupture disc 30 is disposed on the rupture disc outer cylinder 4, for breaking when the annular pressure is greater than or equal to a first preset pressure, so that fluid can enter the upper drive channel 101 from the rupture hole of the rupture disc 30, realize the connection with the annular pressure, and drive the spindle upward and shear the shear pin 29; the seat cap 32 is disposed at the lower end of the spindle 3, for driving the upper ball valve mechanism to move upward and open.

[0041] Specifically, one end of the outer cylinder 4 of the rupture disc is fixedly connected to the connecting outer cylinder 2, preferably by a threaded connection. The outer cylinder 4 is sleeved on the outer periphery of the mandrel 3. A shearing pin 29 is provided on one side (the inner circumferential wall) of the outer cylinder 4 and the mandrel 3, and an upper drive channel 101 for driving the mandrel 3 upwards is provided between the outer cylinder 4 and the mandrel 3. The first preset pressure can be the pressure required to break the rupture disc 30 on the outer cylinder 4.

[0042] The working principle of the upper pressure drive mechanism is as follows: liquid pressure is introduced into the annular space between the outer periphery of the valve and the sleeve outside the valve (not shown in the figure). This pressure breaks the rupture disc 30 on the outer cylinder 4 of the rupture disc and enters the upper drive channel 101, driving the spindle 3 upward and shearing the shear pin 29. Then the spindle 3 moves upward, and multiple arc-shaped locking blocks 28 in the locking block mechanism are embedded in the annular locking groove 3a, realizing the relative positioning of the spindle 3 and the connecting outer cylinder 2.

[0043] Spring mechanism ( Figure 1 Part C is located below the upper pressure drive mechanism, connecting the upper pressure drive mechanism and the upper ball valve mechanism. It is coaxially mounted on the spindle 3, with its upper end limited to the upper pressure drive mechanism and its lower end connected to the upper ball valve mechanism. A spring mechanism acts on the upper ball valve mechanism to initially place it in the closed position. When the pump is running, the upper ball valve mechanism compresses the spring mechanism, allowing the entire upper ball valve mechanism to move upwards. During pressure testing, the spring mechanism resets, the entire upper ball valve mechanism resets, and the upper bypass mechanism closes. Specifically, as shown... Figure 5 As shown, the spring mechanism may include: a spring 6, a split spring sleeve 8, and a spring retaining ring 7 fitted onto the spring sleeve 8. The working principle of this spring mechanism is as follows: In Figure 5, the spring 6 is in its initial compressed state. The resulting spring force is transmitted to the spring retaining ring 7 and the spring sleeve 8, and thus to the upper ball valve mechanism, keeping it in its initial closed state. When the lower pump is turned on, the spring 6 is compressed. During the upper pressure test, the spring 6 returns to its initial installation state.

[0044] Upper ball valve mechanism ( Figure 1 Part D is positioned between the spring mechanism and the upper bypass mechanism, allowing it to move vertically. It is used to seal the upper part of the multi-functional valve for upper pressure testing. When the mandrel 3 moves upward, it opens under the action of the mandrel 3, opening the upper passage and enabling cyclic operation. Specifically, the upper ball valve mechanism is connected between the spring mechanism and the upper bypass mechanism, allowing both to be sealed (i.e., the upper ball valve mechanism is closed), thus closing the oil pipe passage for pressure testing.

[0045] In this embodiment, as Figure 6 , 13 As shown in Figure -15, the upper ball valve mechanism includes: a ball valve outer cylinder 5, a differential piston 9, a connector 10, and a first ball valve assembly 25; wherein, the differential piston 9 is disposed inside the ball valve outer cylinder 5; the connector 10 is disposed below the differential piston 9 (e.g., Figure 7As shown on the right side), the bottom end of the connector 10 is sequentially connected to an upper operating pin 11, a first upper seat ring 12, a C-shaped sleeve 13, and a first lower seat ring 14. The two ends of the C-shaped sleeve 13 are respectively connected to the first upper seat ring 12 and the first lower seat ring 14 to tighten the first upper seat ring 12 and the first lower seat ring 14. The first ball valve assembly 25 is rotatably disposed on the inner circumference of the first upper seat ring 12 and the first lower seat ring 14. Furthermore, the upper operating pin 11 is also connected to the first ball valve assembly 25 to drive the first ball valve assembly 25 to rotate when the upper operating pin 11 moves up and down with the connector 10 and the differential piston 9, so that the first ball valve assembly 25 opens or closes, thereby realizing the conduction and cut-off of the upper and lower passages of the first ball valve assembly 25. That is, the first ball valve assembly 25 opens to realize the upper passage, and the first ball valve assembly 25 opens and closes to block the upper passage.

[0046] Specifically, the outer cylinder 5 of the ball valve is positioned between the outer cylinder 4 of the rupture disc and the connecting joint 20, and can be connected to both respectively. The connecting head 10 is connected to the differential piston 9, and the bottom end of the connecting head 10 is sequentially connected to the operating pin 11, the first upper seat ring 12, the C-shaped sleeve 13, the first lower seat ring 14, and the seat spring 33. The operating pin 11 and the connecting head 10 are connected by a slot. The C-shaped sleeve 13 tightens the first upper seat ring 12 and the first lower seat ring 14, and the first ball valve assembly 25 is clamped and positioned in the first upper seat ring 12 and the first lower seat ring 14. Figure 15 As shown, the first upper seat ring 12 and the first lower seat ring 14, and the C-type sleeve 13 are separate structures. During the connection process, the first ball valve assembly 25 can be clamped and positioned; the operating pin 11 drives the first ball valve assembly 25 to rotate, so as to pass through the through diameter of the mandrel 3, as shown. Figure 13 and Figure 14 As shown, the other end of the operating pin 11 is provided with a ball head 11a that is rotatably embedded in the drive hole 25a of the first ball valve assembly 25. That is, one end of the operating pin 11 is connected to the connector 10, and the other end is provided with a ball head 11a. The first ball valve assembly 25 is provided with a drive hole 25a. The ball head 11a is rotatably embedded in the drive hole 25a. By moving the connector 10 upward, the ball head 11a drives the first ball valve assembly 25 to rotate in the first upper seat ring 12 and the first lower seat ring 14 until the through hole of the first ball valve assembly 25 is connected to the through hole of the spindle 3, thereby realizing the conduction to the inside of the spindle 3, that is, realizing the upper through hole.

[0047] The overall working principle of the upper ball valve mechanism is as follows: When the upper part of the first ball valve assembly 25 is pressure tested, pressure is applied from the upper bore of the tool, i.e., pressure test fluid is introduced into the upper connector 1. At this time, the first ball valve assembly 25 remains in the initial closed state, and the pressure test can be performed. When the pump is turned on, the fluid pressure enters the lower part of the first ball valve assembly 25 from the circulation hole 103 on the outer circulation cylinder 21 (e.g., ...). Figure 6As shown on the right side), the upper ball valve mechanism moves upward as a whole, causing the upper bypass mechanism to open, that is, the first bypass hole 102 on the first lower seat ring 14 is aligned with the first bypass hole 102 on the connecting spindle 18, and the fluid enters the upper part of the tool, that is, the upper side of the first ball valve assembly 25, along the upper bypass mechanism.

[0048] When the upper ball valve mechanism needs to be opened, pressure can be applied from the annulus to break the upper rupture disc 30. The rupture disc hole enters the upper drive channel 101 and acts on the stepped surface of the spindle 3, causing the spindle 3 to move upward and shear the shear pin 29. The end face of the seat cap 32 connected to the spindle 3 moves upward and contacts the differential piston 9. The differential piston 9 moves upward and drives the connector 10. The connector 10 drives the operating pin 11 to move upward. The operating pin 11 moves upward and rotates the first ball valve assembly 25 to open, thus opening the upper ball valve mechanism.

[0049] Upper bypass mechanism ( Figure 1 The upper bypass mechanism (part E) connects the upper ball valve mechanism and the lower circulation mechanism. Initially closed, it drives the upper ball valve mechanism upwards when the downhole pressure is greater than or equal to a threshold, thereby opening the upper bypass mechanism. This allows fluid from the lower part of the upper ball valve mechanism to flow along the upper bypass mechanism to the upper part, achieving upper bypass. Specifically, when the downhole pressure is greater than or equal to the threshold (which can be 0.92 MPa), the upper bypass mechanism opens, reducing downhole resistance and enabling reverse circulation well control in emergencies.

[0050] In this embodiment, as Figure 7 As shown, the upper bypass mechanism includes a limiting sleeve 19 and a retaining sleeve 15; wherein, the limiting sleeve 19 is connected to the first lower seat ring 14, the limiting sleeve 19 is sleeved on the outer periphery of the connecting spindle 18, and the outer wall of the connecting spindle 18 has a retaining ring 17 protruding to limit the travel of the limiting sleeve 19 as it moves with the first lower seat ring 14; the retaining sleeve 15 is disposed on the upper side of the limiting sleeve 19 and is sandwiched between the connecting spindle 18 and the first lower seat ring 14; the connecting spindle 18 and the retaining sleeve 15 are provided with corresponding first bypass holes 102, and the first lower seat ring 14 is provided with a first bypass hole 102, such as... Figure 6As shown, the first upper seat ring 12 has a second bypass hole 12a, and the first bypass hole 102 on the first lower seat ring 14 is arranged opposite to the first bypass hole 102 on the retaining sleeve 15, so that when the limiting sleeve 19 moves upward to the retaining ring 17, the retaining sleeve 15 and the first lower seat ring 14 move synchronously to the first bypass hole 102 on the first lower seat ring 14, and the first bypass hole 102 on the retaining sleeve 15 is directly opposite to the first bypass hole 102 on the connecting mandrel 18, thereby allowing the fluid to pass sequentially through the first bypass hole 12a on the connecting mandrel 18. The bypass hole 102, the first bypass hole 102 on the retaining sleeve 15, and the first bypass hole 102 on the first lower seat ring 14 enter the gap between the first lower seat ring 14 and the outer cylinder 5 of the ball valve, and flow upward from the second bypass hole 12a to the upper part of the first ball valve assembly 25, forming a bypass channel. After the first lower seat ring 14 is reset with the differential piston 9, the first bypass hole 102 on the first lower seat ring 14 and the retaining sleeve 15 are misaligned with the first bypass hole 102 on the connecting spindle 18, so that the bypass channel is closed.

[0051] Specifically, the sealing assembly 24 is located between the connecting spindle 18 and the retaining sleeve 15. The retaining sleeve 15 has a first bypass hole 102. The limiting sleeve 19 and the first lower seat ring 14 are connected by threads. The outer wall of the connecting spindle 18 has a retaining ring 17 that restricts the movement of the limiting sleeve 19. The connecting spindle 18 and the retaining sleeve have corresponding first bypass holes 102.

[0052] Specific principle: When the pressure at the lower part of the upper ball valve assembly 25 reaches 0.92MPa, the upper ball valve mechanism (limit sleeve 19, stop sleeve 15, first lower seat ring 14, C-type sleeve 13, first upper seat ring 12, operating pin 11, connector 10, differential piston 9, ball valve assembly 25, seat spring 33) moves upward synchronously until the inner step of the limit sleeve 19 contacts the retaining ring 17 for limiting. At this time, the first bypass hole 102 on the first lower seat ring 14 is aligned with the first bypass hole 102 on the connecting spindle 18. The fluid enters the gap between the outer circle of the first lower seat ring 14 and the inner hole of the ball valve outer cylinder 5 along the first bypass hole 102, then flows into the gap between the outer circle of the C-type sleeve 13 and the inner hole of the ball valve outer cylinder 5, flows into hole 12a, and enters the upper part of the ball valve assembly 25 to achieve bypass.

[0053] Lower circulation mechanism ( Figure 2 The middle F section is located between the upper bypass mechanism and the lower pressure drive mechanism. It is used to open or close the connection channel between the annulus and the bore. When the connection channel between the annulus and the bore is opened, the fluid can circulate from the connection channel between the annulus and the bore. The fluid of the entire circulation operation of the tool enters or flows out from this point.

[0054] In this embodiment, as Figure 8 As shown, the lower circulation mechanism includes: a circulation outer cylinder 21 and a circulation mandrel 22; wherein, the circulation outer cylinder 21 is connected to the connecting joint 20; the circulation mandrel 22 is disposed inside the circulation outer cylinder (21), and a shearing pin 29 capable of cutting is provided between the circulation outer cylinder 21 and the circulation mandrel 22, and both the circulation outer cylinder 21 and the circulation mandrel 22 are provided with aligned circulation holes 103. Specifically, the circulation outer cylinder 21 is connected to the connecting joint 20, the circulation mandrel 22 is connected to the circulation outer cylinder 21, and both the circulation outer cylinder 21 and the circulation mandrel 22 are provided with aligned circulation holes 103, wherein the stepped surface of the circulation mandrel 22 is close to the circulation outer cylinder 21, and the circulation mandrel 22 is connected and fixed to the circulation outer cylinder 21 by the shearing pin 29.

[0055] Specific principle: The diagram shows the initial installation state. The circulation hole 103 on the circulation mandrel 22 is aligned with the circulation hole 103 on the circulation outer cylinder. The fluid enters the lower part of the upper ball valve assembly 25 from this point. The upper ball valve mechanism moves upward as a whole, causing the upper bypass mechanism to open. That is, the first bypass hole 102 on the first lower seat ring 14 is aligned with the first bypass hole 102 on the connecting mandrel 18. The fluid enters the upper part of the tool, i.e., the upper side of the first ball valve assembly 25, along the upper bypass mechanism to achieve bypass. When the upper ball valve assembly 25 is opened, i.e., after the upper through-hole, the fluid can perform forward circulation (fluid circulation from the through-hole to the annulus) and reverse circulation (fluid circulation from the annulus to the through-hole).

[0056] Lower pressure drive mechanism ( Figure 2 The middle section (G section), located between the lower circulation mechanism and the lower ball valve mechanism, is used to cut off the connection between the annulus and the through-hole when the annulus pressure is greater than or equal to the second preset pressure, by applying the annulus pressure to the lower circulation mechanism. The second preset pressure is greater than the first preset pressure and can be the pressure required to break the rupture disc 30 on the outer circulation cylinder 21. Specifically, the annulus pressure is injected and applied to the stepped surface of the circulation mandrel 22, driving the circulation mandrel 22 downwards. This causes the circulation hole 103 on the circulation mandrel 22 to misalign and block the circulation hole 103 on the outer circulation cylinder, thus opening the internal through-hole and causing the lower ball valve mechanism to open.

[0057] In this embodiment, as Figure 9As shown, the lower pressure mechanism includes a lower drive channel 104 and a rupture disc 30. The lower drive channel 104 is disposed between the outer circulation cylinder 21 and the circulation mandrel 22. The rupture disc 30 is disposed on the outer circulation cylinder 21 and is used to break the annular pressure when it is greater than or equal to a second preset pressure, allowing fluid to enter the lower drive channel 104 from the rupture hole of the rupture disc 30, achieving communication with the annular pressure. It can also drive the circulation mandrel 22 downward and shear the shear pin 29 between the outer circulation cylinder 21 and the circulation mandrel 22, causing the circulation hole 103 on the circulation mandrel 22 to be misaligned and blocked with the circulation hole 103 on the outer circulation cylinder, cutting off the connection channel between the annulus and the bore, i.e., the circulation hole 103. Specifically, the outer circulation cylinder 21 is fixedly connected to the connecting joint 20, and the outer circulation cylinder 21 is connected to the circulation mandrel 22 through the shear pin 29. A rupture disc 30 is also provided at the lower part of the circulating outer cylinder 21. Its rupture pressure is greater than that of the rupture disc 30 on the upper rupture disc outer cylinder 4. After the annular pressure breaks the rupture disc 30 at this location, the annular pressure fluid enters between the circulating outer cylinder 21 and the circulating mandrel 22 and shears the shear pin 29. The circulating mandrel 22 moves downward, causing the annular pressure hole (circulation hole 103) of the circulating mandrel 22 to be misaligned and blocked with the annular pressure hole (circulation hole 103) on the circulating outer cylinder 21, thereby enabling the internal passage diameter. Preferably, the bottom side of the circulating outer cylinder 21 is threadedly connected to a mandrel outer cylinder 23 that provides a step-limiting position for the circulating mandrel 22.

[0058] Specific principle: The annular space is pressurized, breaking the rupture disc 30 on the outer cylinder 21. The pressure enters through the hole of the rupture disc and acts on the circulation spindle 22. The circulation spindle 22 descends and shears the shear pin 29, pushing the connecting claw 26 downward, pushing the operating pin 35 downward, and the operating pin 35 actuates the lower ball valve assembly 37 to open.

[0059] Lower ball valve mechanism ( Figure 2 The lower ball valve (part H) is located between the lower pressure drive mechanism and the lower connector. It is initially closed to seal the lower part of the multi-functional valve, allowing fluid to flow upwards. It opens when the lower circulation mechanism cuts off the connection between the annulus and the flow path, achieving full flow path of the valve body. Specifically, the lower ball valve mechanism is initially closed and opens under annular pressure, penetrating the bottom flow path of the lower pressure drive mechanism.

[0060] In this embodiment, as Figure 10As shown, the lower ball valve mechanism includes: a connecting claw 26, a lower operating pin 35, a second upper seat ring 36, a second lower seat ring 38, and a second ball valve assembly 37. The connecting claw 26, lower operating pin 35, second upper seat ring 36, and second lower seat ring 38 are sequentially connected to the circulating spindle 22, i.e., the connecting claw 26, lower operating pin 35, second upper seat ring 36, and second lower seat ring 38 are sequentially arranged on the lower side of the circulating spindle 22, and the lower end of the second lower seat ring 38 is connected to the lower connector 39. The second ball valve assembly 37 is rotatably disposed on the inner circumference of the second upper seat ring 36 and the second lower seat ring 38. The lower operating pin 35 is also connected to the second ball valve assembly 37, and is used to drive the second ball valve assembly 37 to rotate when the lower operating pin 35 moves downward with the connecting claw 26, so that the second ball valve assembly 37 opens or closes, thereby realizing the through or cut-off diameter of the circulating spindle 22 and the lower connector 39.

[0061] Specifically, a second ball valve assembly 37 is clamped and positioned in the second upper seat ring 36 and the second lower seat ring 38. The second upper seat ring 36 and the second lower seat ring 38 provide a preload force for the second ball valve assembly 37. A seat spring 33 is also provided between the upper ends of the second upper seat ring 36 and the second ball valve assembly 37 to eliminate the gap between the second ball valve assembly 37 and the second upper seat ring 36 and the second lower seat ring 38. A lower connector 33 is fixedly connected to the bottom of the second lower seat ring 32. The operating pin 35 drives the second ball valve assembly 37 to rotate and pass through the through-hole of the circulating spindle 22 and the lower connector 39.

[0062] The working principle of the lower ball valve mechanism is as follows: When pressurized fluid is introduced through the annular pressure hole (circulation hole 103) on the connecting outer cylinder 21 and the circulating mandrel 22, the second ball valve assembly 37 blocks the lower part of the annular pressure hole, enabling the upper multiple mechanisms to operate accordingly under the action of the pressurized fluid. When the valve is fully open, after the annular pressure breaks the lower rupture disc 30, pressurized fluid enters the lower drive channel 104, driving the circulating mandrel 22 downwards. The connecting claw 26 pushes the operating pin 35 downwards, and the operating pin 35 drives the second ball valve assembly 37 to rotate downwards and open (same structure as the first ball valve assembly 25 described above), thus opening the lower passage, i.e., achieving full passage. Under the action of hydrostatic injection pressure, the circulating mandrel remains in a downward state, i.e., the ball remains open.

[0063] The working principle of this invention is:

[0064] 1. Pressure test operation: After the RD multi-functional valve of this application is lowered into the casing in the well, the pressure test fluid is introduced into the upper connector 1 from the top and sealed through the first ball valve assembly 25 on the upper side. The ball valve part of the first ball valve assembly 25 is pressure tested to check the sealing of the upper part of the tubing string and observe whether there is any leakage.

[0065] 2. Bypass cycle operation

[0066] Bypass circulation operation: Due to the obstruction of the tool borehole, there will be significant resistance during the downhole process. Therefore, the bypass function is particularly important at this time. When the pressure at the lower part of the upper ball valve assembly 25 reaches 0.92MPa, the upper ball valve mechanism (limit sleeve 19, stop sleeve 15, first lower seat ring 14, C-type sleeve 13, first upper seat ring 12, operating pin 11, connector 10, differential piston 9, ball valve assembly 25, seat spring 33) moves upward synchronously until the inner step of the limit sleeve 19 contacts the retaining ring 17 for limiting. At this time, the first bypass hole 102 on the first lower seat ring 14 is aligned with the first bypass hole 102 on the connecting mandrel 18, and the fluid flows along the first bypass hole 102 on the first lower seat ring 14. Through hole 102, the first bypass hole 102 on the connecting mandrel 18 enters the gap between the outer circle of the first lower seat ring 14 and the inner hole of the ball valve outer cylinder 5, and then flows into the gap between the outer circle of the C-type sleeve 13 and the inner hole of the ball valve outer cylinder 5. It then flows into the second bypass hole 12a and enters the upper part of the ball valve assembly 25 to achieve bypass and reduce the well resistance. When an emergency occurs and reverse circulation well killing is required, well killing fluid is injected into the annulus. The well killing fluid enters the lower part of the upper ball valve assembly from the lower circulation hole, and then flows into the upper part of the tool from the bypass hole to achieve reverse circulation well killing operation. The flow direction is the same as above.

[0067] 3. Cyclic operation

[0068] Cyclic operation: First, the annular pressure fluid breaks the upper rupture disc 30, and the pressure fluid enters the upper drive channel 101, driving the mandrel 3 upward and shearing the shear pin 29. The mandrel overcomes the spring force, and the mandrel 3 drives the seat cap 32 to continue moving upward, driving the differential piston 9 to move upward, the connector 10 to move upward, pulling the operating pin 11 to move upward, pulling the ball valve open. After the ball valve opens, the mandrel continues to move upward until the 3b step surface on the mandrel is limited to the 2a step. At this time, the multiple arc-shaped locking blocks 28 in the locking block mechanism are embedded in the annular locking groove 3a, realizing the relative limitation between the mandrel 3 and the connecting outer cylinder 2. At this time, the ball valve is locked open, and the upper passage is opened.

[0069] At this point, circulating fluid can be pumped into the tool bore, and the circulating fluid enters the annulus through the first bypass hole 102 at the bottom of the tool to perform a forward circulation operation from the tool bore to the annulus. Alternatively, circulating fluid can be pumped into the annulus, and the circulating fluid enters the tool bore through the first bypass hole 102 to perform a reverse circulation operation from the annulus to the tool bore.

[0070] 4. Achieve full bore and proceed with subsequent operations.

[0071] To achieve full bore: The annular pressure is increased and the lower rupture disc 30 is broken. The annular fluid enters the lower drive channel 104 between the outer cylinder 21 of the rupture disc and the circulating mandrel 22, and drives the circulating mandrel 22 downward. At the same time, the shear pin 29 is cut, and the connecting claw 26 is driven to move downward synchronously, closing the circulation hole 103. During the process of sequentially driving the operating pin 35 to open the second ball valve assembly 37, after the central hole of the second ball valve assembly 37 is in the axial state of the bore, the end of the connecting claw 26 corresponds to the inner wall surface 23a of the outer cylinder 23 of the mandrel and expands outward. At this time, the connecting claw 26 is disengaged from the circulating mandrel 11, and the connecting claw 26 climbs onto the outer wall of the circulating mandrel 22. The circulating mandrel 22 continues to descend until it reaches the step limit with the outer cylinder 23 of the mandrel. At this time, the annular hole, i.e., the circulation hole 103, is completely closed. During this process, the second ball valve assembly 37 is always kept in the normal bore state. At this time, the entire valve is in the full bore state.

[0072] In summary, the RD multi-functional valve provided in this embodiment can perform upper tubing pressure testing after a single well run, with a maximum test pressure of 103.5 MPa. It features a built-in hydraulic bypass mechanism; when the downhole pressure reaches 0.92 MPa, the upper bypass mechanism opens, reducing downhole resistance. In emergencies, it can perform reverse circulation well control. Because the pump operation is a dynamic process, the sealing assembly crosses the bypass hole multiple times. Through the bidirectional spring-energy-storing sealing assembly, it can seal against a bidirectional absolute pressure of 103.5 MPa. Testing showed good sealing performance and stable sealing capabilities. After the pressure test, the annulus is pressurized to break the upper rupture disc, causing the upper ball valve mechanism to lock and open, allowing for forward and reverse circulation operations. After the cycle operation is completed, the annulus is pressurized. Under the action of the lower pressure drive mechanism, the lower circulation mechanism closes, cutting off communication with the annulus. The lower ball valve mechanism opens, and the tool is now in full-bore condition, ready for further operations. This RD multi-functional valve solves the problems of current tools having a simple structure, complex operation, and prolonged operation cycles, while also affecting the tool's downhole sealing and increasing operating costs. It also allows for flexible selection of different operational procedures.

[0073] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0074] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0075] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. An RD multi-functional valve suitable for high-temperature and high-pressure formation testing operations at sea, characterized in that, include: The upper connector (1), spindle (3), connecting spindle (18), connecting connector (20) and lower connector (39) are arranged in sequence; wherein, the direction from the upper connector (1) to the lower connector (39) is from top to bottom; A locking mechanism is provided and connected between the upper connector (1) and the spindle (3) for locking the spindle (3) onto the upper connector (1) after the spindle (3) has moved up a preset stroke relative to the upper connector (1); An upper pressure drive mechanism is provided on the lower side of the locking block mechanism and connected to the locking block mechanism. The upper pressure drive mechanism is sleeved on the outer periphery of the mandrel (3) and is used to open and communicate with the annular pressure when the annular pressure is greater than or equal to the first preset pressure, and drive the mandrel (3) to move upward under the action of the annular pressure. The spring mechanism is coaxially mounted on the spindle (3). The upper end is limited to the upper pressure drive mechanism, and the lower end is connected to the upper ball valve mechanism. The spring mechanism acts on the upper ball valve mechanism so that the upper ball valve mechanism is initially in the closed position. When the pump is turned on, the upper ball valve mechanism compresses the spring mechanism so that the upper ball valve mechanism can move upward as a whole. When the pressure is tested, the spring mechanism resets, the upper ball valve mechanism is reset as a whole, and the upper bypass mechanism is closed. The upper ball valve mechanism is arranged between the spring mechanism and the upper bypass mechanism in a way that allows it to move up and down. It is used to block the upper part of the multi-functional valve for upper pressure testing, and opens under the action of the mandrel (3) when the mandrel (3) moves upward to realize the upper passage and then carry out cyclic operation. The upper bypass mechanism is connected between the upper ball valve mechanism and the lower circulation mechanism. It is initially in a closed state. When the downhole pressure is greater than or equal to a threshold, it drives the upper ball valve mechanism to move upward, thereby opening the upper bypass mechanism so that the fluid in the lower part of the upper ball valve mechanism can flow along the upper bypass mechanism to the upper part of the upper ball valve mechanism, thus realizing upper bypass. The lower circulation mechanism, located between the upper bypass mechanism and the lower pressure drive mechanism, is used to open or close the connection channel between the annulus and the bore, and when the connection channel between the annulus and the bore is opened, the fluid can circulate from the connection channel between the annulus and the bore. The lower pressure drive mechanism, located between the lower circulation mechanism and the lower ball valve mechanism, is used to apply the annular pressure to the lower circulation mechanism when the annular pressure is greater than or equal to the second preset pressure, so as to cut off the connection channel between the annular cavity and the through-hole; wherein the second preset pressure is greater than the first preset pressure; The lower ball valve mechanism, located between the lower pressure drive mechanism and the lower connector, is initially in a closed state to block the lower part of the multi-functional valve so that the fluid can flow upward. It opens when the lower circulation mechanism cuts off the connection channel between the annulus and the through-bore, thus realizing the full through-bore of the valve body.

2. The RD multi-functional valve for offshore high-temperature and high-pressure formation testing operations as described in claim 1, characterized in that, The locking mechanism includes: The connecting outer cylinder (2) is sleeved on the outer periphery of the mandrel (3), and the connecting outer cylinder (2) is connected to the upper connector (1). There is a gap between the upper end of the connecting outer cylinder (2) and the upper connector (1) along the axial direction of the upper connector (1). Multiple arc-shaped locking blocks (28) are arranged along the axial direction of the spindle (3) at the gap between the upper end of the connecting outer cylinder (2) and the upper connector (1), and are arranged along the radial direction of the spindle (3) between the spindle (3) and the connecting outer cylinder (2). The multiple arc-shaped locking blocks (28) are arranged at intervals along the circumference of the spindle (3). A tension spring (27) is sleeved on the outer periphery of each of the arc-shaped locking blocks (28) to apply an inner radial force to the arc-shaped locking blocks (28); Arc-shaped locking groove (3a): The outer peripheral wall of the spindle (3) is provided with arc-shaped locking grooves (3a) that correspond one-to-one with and are adapted to the arc-shaped locking blocks (28). When the spindle (3) moves to the position where the arc-shaped locking groove (3a) is adapted to the arc-shaped locking blocks (28), each arc-shaped locking block (28) can move towards the axis of the spindle (3) under the action of the tension spring (27) so that part of the arc-shaped locking block (28) is locked in the corresponding arc-shaped locking groove (3a) and part of it is limited and locked between the connecting outer cylinder (2) and the upper connector (1) to realize the locking of the spindle (3).

3. The RD multi-functional valve for offshore high-temperature and high-pressure formation testing operations as described in claim 2, characterized in that, The upper pressure driving mechanism includes: The outer cylinder of the rupture disc (4) is sleeved on the outer periphery of the mandrel (3). An upper drive channel (101) is provided between the outer cylinder of the rupture disc (4) and the mandrel (3). One end of the outer cylinder of the rupture disc (4) is connected to the connecting outer cylinder (2). A shear pin (29) is provided between the outer cylinder (4) of the rupture disc and the mandrel (3), and its two ends are respectively connected to the outer cylinder (4) of the rupture disc and the mandrel (3), and is used to shear the mandrel (3) when it moves relative to the outer cylinder (4) of the rupture disc under the action of external force; A rupture disc (30) is provided on the outer cylinder (4) of the rupture disc. It is used to break the annular pressure when it is greater than or equal to the first preset pressure, so that the fluid can enter the upper drive channel (101) from the rupture hole of the rupture disc (30) to achieve communication with the annular pressure and drive the mandrel upward and cut the shear pin (29). A seat cap (32) is located at the lower end of the spindle (3) and is used to drive the upper ball valve mechanism to move upward and open.

4. The RD multi-functional valve for offshore high-temperature and high-pressure formation testing operations according to any one of claims 1 to 3, characterized in that, The spring mechanism includes: a spring (6), a split spring sleeve (8), and a spring retaining ring (7) that is sleeved on the spring sleeve (8).

5. The RD multi-functional valve for offshore high-temperature and high-pressure formation testing operations according to any one of claims 1 to 3, characterized in that, The upper ball valve mechanism includes: Ball valve outer cylinder (5); A differential piston (9) is disposed inside the outer cylinder (5) of the ball valve; A connector (10) is located on the lower side of the differential piston (9). The bottom end of the connector (10) is connected in sequence to an upper operating pin (11), a first upper seat ring (12), a C-shaped sleeve (13), and a first lower seat ring (14). The two ends of the C-shaped sleeve (13) are respectively connected to the first upper seat ring (12) and the first lower seat ring (14) to tighten the first upper seat ring (12) and the first lower seat ring (14). The first ball valve assembly (25) is rotatably disposed on the inner circumference of the first upper seat ring (12) and the first lower seat ring (14). The upper operating pin (11) is also connected to the first ball valve assembly (25) and is used to drive the first ball valve assembly (25) to rotate when the upper operating pin (11) moves up and down with the connector (10) and the differential piston (9), so as to open or close the first ball valve assembly (25), thereby realizing the conduction and cut-off of the upper and lower passages of the first ball valve assembly (25).

6. The RD multi-functional valve for offshore high-temperature and high-pressure formation testing operations according to any one of claims 1 to 3, characterized in that, The upper bypass mechanism includes: A limiting sleeve (19) is connected to the first lower seat ring (14) of the upper ball valve mechanism. The limiting sleeve (19) is sleeved on the outer periphery of the connecting spindle (18). Furthermore, a retaining ring (17) protrudes from the outer wall of the connecting spindle (18) to limit the travel of the limiting sleeve (19) as it moves with the first lower seat ring (14). A retaining sleeve (15) is disposed on the upper side of the limiting sleeve (19) and sandwiched between the connecting spindle (18) and the first lower seat ring (14); the connecting spindle (18) and the retaining sleeve (15) are provided with corresponding first bypass holes (102), and the first lower seat ring (14) is provided with a first bypass hole (102), and the first upper seat ring (12) is provided with a second bypass hole (12a). The first bypass hole (102) on the first lower seat ring (14) and the first bypass hole (102) on the retaining sleeve (15) are arranged opposite to each other, so that when the limiting sleeve (19) moves upward to the retaining ring (17), the retaining sleeve (15) and the first lower seat ring (14) move synchronously to the first bypass hole (102) on the first lower seat ring (14) and the first bypass hole (12a) on the retaining sleeve (15). 02) All of them are directly opposite to the first bypass hole (102) on the connecting mandrel (18), so that the fluid can pass through the first bypass hole (102) on the connecting mandrel (18), the first bypass hole (102) on the sleeve (15) and the first bypass hole (102) on the first lower seat ring (14) in sequence, enter the gap between the first lower seat ring (14) and the outer cylinder of the ball valve (5), and flow upward from the second bypass hole (12a) to the upper part of the first ball valve assembly (25) to form a bypass channel. After the first lower seat ring (14) is reset with the differential piston (9), the first bypass hole (102) on the first lower seat ring (14) and the sleeve (15) are misaligned with the first bypass hole (102) on the connecting mandrel (18), so that the bypass channel is closed.

7. The RD multi-functional valve for offshore high-temperature and high-pressure formation testing operations according to any one of claims 1 to 3, characterized in that, The lower circulation mechanism includes: The circulating outer cylinder (21) is connected to the connecting joint (20); A circulation mandrel (22) is provided inside the circulation outer cylinder (21). A shear pin (29) capable of cutting is provided between the circulation mandrel (22) and the circulation outer cylinder (21). Furthermore, aligned circulation holes (103) are provided on both the circulation outer cylinder (21) and the circulation mandrel (22).

8. The RD multi-functional valve for offshore high-temperature and high-pressure formation testing operations according to claim 7, characterized in that, The lower pressure mechanism includes: The lower drive channel (104) is disposed between the outer circulation cylinder (21) and the circulation mandrel (22); A rupture disc (30) is provided on the outer circulation cylinder (21) to break the annular pressure when it is greater than or equal to the second preset pressure, so that the fluid can enter the lower drive channel (104) from the rupture hole of the rupture disc (30) to achieve communication with the annular pressure, and can drive the circulation mandrel (22) downward and cut the shear pin (29) between the outer circulation cylinder (21) and the circulation mandrel (22).

9. The RD multi-functional valve for offshore high-temperature and high-pressure formation testing operations according to claim 7, characterized in that, The lower ball valve mechanism includes: The connecting claw (26), the lower operating pin (35), the second upper seat ring (36), and the second lower seat ring (38) are connected in sequence to the circulating spindle (22). The lower end of the second lower seat ring (38) is connected to the lower connector (39). The second ball valve assembly (37) is rotatably disposed on the inner circumference of the second upper seat ring (36) and the second lower seat ring (38). The lower operating pin (35) is also connected to the second ball valve assembly (37) and is used to drive the second ball valve assembly (37) to rotate when the lower operating pin (35) moves downward with the connecting claw (26), so that the second ball valve assembly (37) opens or closes, thereby realizing the through diameter or cut-off diameter of the circulating mandrel (22) and the lower connector (39).

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