Three-stage pressure relief type continuous circulating valve side valve tool

Abstract

The invention belongs to the field of petroleum and natural gas drilling equipment, and relates to a three-stage pressure relief type continuous circulating valve side valve and a matched tool, which mainly comprise a side valve seat, a side valve plate, a rotary pin shaft, a torsion spring, a lower plug, a one-way valve, a three-stage pressure relief device and the like. The side valve seat is installed at a hole in the side face of the lower portion of the continuous circulating valve, the side valve plate is installed on the side valve seat through the pin shaft, the torsion spring is installed on the pin shaft, and one end of the torsion spring makes contact with the side valve plate. The pressure relief device is mainly composed of an upper plug, a pressure relief valve seat, a pressure relief valve element, a probe and the like, the upper plug is connected with the side valve seat through threads, the pressure relief valve seat is installed at the position of the upper plug, the pressure relief valve element is installed on the pressure relief valve seat in a threaded connection mode, and axial displacement of the pressure relief valve element is limited through a step. According to the continuous circulating valve side valve, the main valve of the continuous circulating valve side valve and the ground manifold equipment are combined, automatic switching of different circulating states is completed by controlling automatic opening and closing of the side valve according to the circulating state needed during well drilling, and the well drilling efficiency is greatly improved.

Description

Technical Field

[0001] The invention belongs to the field of oil and natural gas drilling equipment and relates to a three-stage pressure relief continuous circulation valve side valve tool for a continuous circulation system. Background Art

[0002] As an important equipment in oil drilling operations, the side valve of the continuous circulation valve is mainly used in the safe development of various oil drillings. Its application greatly improves the drilling efficiency and ensures the safe and effective drilling. The side valve is the core equipment in the continuous circulation valve and is also the core component connecting the side circulation pipeline. However, in recent years, the problem of the side valve being unable to connect the side circulation pipeline due to wear often occurs, causing the drilling operation to stagnate. More seriously, it will affect the downhole drilling pressure and cause accidents. Therefore, it is very important to ensure the reliability of the seal in the side valve. The present invention innovatively proposes a side valve built-in check valve solution. In the extreme case of leakage in the side valve, the built-in check valve can block the side valve flow channel inlet through the hydraulic action from bottom to top, so that the side valve is always in a sealed state, and the side circulation conversion can still be completed; and a three-stage pressure relief device is designed, which is arranged layer by layer through a ladder to achieve step-by-step pressure relief of different pressure values. The built-in probe and pressure relief holes make the leakage pressure visual and the pressure relief environment safe, which is of great significance to the safe and effective application of the continuous circulation system. Summary of the invention

[0003] The purpose of the present invention is to provide a three-stage pressure relief continuous circulation valve side valve tool to solve the problems of drilling efficiency and existing safety instability. By setting a one-way valve and a multi-stage pressure relief method, absolute safety of step-by-step pressure relief can be achieved.

[0004] The technical solution adopted by the present invention is: A three-stage pressure relief continuous circulation valve side valve tool The utility model is characterized in that it is mainly composed of a side valve seat, a side valve plate, a rotary pin shaft, a torsion spring, a lower plug, a one-way valve, a three-stage pressure relief device and the like. Its characteristics are: the side valve seat is located on the valve body through a threaded connection; the side valve plate is hinged with the side valve seat through a rotary pin; a torsion spring is mounted on the rotary pin, and one end of the torsion spring is pressed on the back of the side valve plate to form a torque; the side valve seat has an inner cavity adapted to the one-way valve, the one-way valve is placed in the inner cavity of the side valve seat from bottom to top, the lower plug is threadedly connected to the inner cavity of the side valve seat, and the one-way valve is located on the lower plug and is restricted from downward displacement; the three-stage pressure relief device comprises an upper plug, a pressure relief valve seat, a pressure relief valve core, a probe, and a probe lock, the upper plug is threadedly connected to the through hole on the side valve seat, the pressure relief valve seat is sealed with the upper plug pipe thread, the probe is placed in the through hole of the pressure relief valve core, and is threadedly connected to the probe lock located on the step of the pressure relief valve core, and a pressure scale is provided on the probe; the pressure relief valve core is threadedly connected to the inner cavity of the pressure relief valve seat.

[0005] A three-stage pressure relief continuous circulation valve side valve tool in the above scheme is characterized in that: the one-way valve is placed in the inner cavity of the side valve seat and sits on the lower plug; a sealing ring is provided on the one-way valve. If the sealing surface of the side valve plate is worn and cannot be sealed, the drilling fluid flows through the inner cavity of the one-way valve and impacts the second plane of the one-way valve to push the one-way valve to move in the inner cavity of the side valve seat; the conical annular surface of the one-way valve is contacted and sealed with the first conical annular surface of the side valve seat to achieve the closed seal of the second one-way valve. During side circulation, the drilling fluid directly impacts the first plane of the one-way valve to push the one-way valve downward and limit it above the lower plug. At this time, the drilling fluid turns to flow into the inner cavity of the one-way valve through the side hole of the one-way valve and flows through the through hole of the lower plug, and finally acts on the plane of the side valve plate to overcome the torsion of the torsion spring, so that the side valve plate opens at a certain angle, thereby achieving the connection between the side valve and the main channel.

[0006] A three-stage pressure relief continuous circulation valve side valve tool in the above scheme is characterized in that: when there is pressure in the side valve seat, the probe will be instantly popped up, and there are small pressure relief holes evenly distributed along the circumference in the pressure relief valve seat. The pressure relief valve core is rotated above the pressure relief holes to connect the pressure relief holes with the outside world and relieve pressure, forming a first-stage pressure relief device; the pressure relief valve seat is threadedly connected to the upper plug, and the knob is pulled out of the pressure relief valve seat to continue to remove the remaining pressure, forming a second-stage pressure relief device; the upper plug is threadedly connected to the through hole on the side valve seat, and the upper plug is removed by a special tool, and the residual pressure will be completely released, forming a third-stage pressure relief device; when the three-stage pressure relief device is switched in a continuous cycle, the pressure relief method is used to relieve pressure inside the side valve seat to ensure safe operation of the side cycle.

[0007] Compared with the prior art, the present invention has the following beneficial effects: 1. A one-way valve is placed in the inner cavity of the side valve seat, and a sealing ring is provided on the one-way valve to prevent debris and liquid from leaking up and down. The fluid can control the movement of the one-way valve by impacting the inner cavity of the one-way valve. In the extreme case of leakage of the side valve, the one-way valve can block the inlet of the flow channel of the side valve seat through the water pressure from bottom to top, so that the side valve is always in a safe state. 2. A new three-stage pressure relief device is adopted, and each pressure relief part is conveniently and quickly assembled and disassembled through a threaded connection. Several pressure relief holes are arranged circumferentially inside the pressure measuring valve seat. The pressure relief valve core can be controlled to communicate with the inside and outside of the pressure relief holes by turning the upper and lower knobs. 3. The probe with pressure scale lines is located on the step of the pressure relief valve core, and is passively ejected when the pressure leaks, which can conveniently know and quantify the pressure leakage status. The three-stage pressure relief device is convenient for pressure measurement and safe pressure relief during continuous cycle switching, ensuring the absolute safety of the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a three-stage pressure relief continuous circulation valve side valve tool profile of the present invention; Figure 2 It is a schematic diagram of the connection between the side valve and the main channel of the present invention; Figure 3is an external schematic diagram of the side valve tool of the present invention; Figure 4 is a cross-sectional view of the side valve seat of the present invention; Figure 5 is a schematic diagram of a one-way valve of the present invention; Figure 6 yes Figure 5 AA section view; Figure 7 is a cross-sectional view of a three-stage pressure relief device of the present invention; Figure 8 is a cross-sectional view of the pressure relief valve core of the present invention; Fig. 9 is a schematic diagram of a pressure relief valve seat of the present invention; In the figure: 1. side valve seat, 1a. inner cavity of side valve seat, 1b. first conical ring surface of side valve seat, 1c. second conical ring surface of side valve seat, 1c. through hole on side valve seat, 2. main valve body, 2a. main valve channel, 3. side valve plate, 3a. back of side valve plate, 3b. conical ring surface of side valve plate, 3c. front of side valve plate, 4. rotary pin, 5. torsion spring, 6. check valve, 6a. inner cavity of check valve, 6b. seal Sealing ring, 6c. First plane of one-way valve, 6d. Second plane of one-way valve, 6e. Conical annulus of one-way valve, 6f. Side hole of one-way valve, 7. Lower plug, 7a. Through hole of lower plug, 8. Upper plug, 9. Pressure relief valve seat, 9a. Small hole for pressure relief, 9b. Through hole of pressure relief valve seat, 10. Pressure relief valve core, 10a. Through hole of pressure relief valve core, 10b. Step of pressure relief valve core, 11. Probe, 12. Probe lock. DETAILED DESCRIPTION

[0009] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0010] See attached Figure 1 , 2 , 3 and attached Figure 4, characterized in that it is mainly composed of a side valve seat, a side valve plate, a rotating pin, a torsion spring, a lower plug, a one-way valve, a three-stage pressure relief device, etc. Its characteristics are: the side valve seat 1 is seated on the valve body 2 through a threaded connection; the side valve plate 3 is hinged with the side valve seat 1 through a rotating pin 4; a torsion spring 5 is mounted on the rotating pin 4, and one end of the torsion spring 5 is pressed on the back side 3a of the side valve plate to form a torsion force; the side valve seat 1 has an inner cavity 1a adapted to the one-way valve 6, and the one-way valve 6 is placed in the inner cavity 1a of the side valve seat from bottom to top, and the lower plug 7 is threadedly connected to the inner cavity 1a of the side valve seat, and the one-way valve 6 is seated on the lower plug 7 and is restricted from moving downward; The three-stage pressure relief device includes an upper plug 8, a pressure relief valve seat 9, a pressure relief valve core 10, a probe 11, and a probe lock 12. The upper plug 8 is threadedly connected to the through hole 1d on the side valve seat, the pressure relief valve seat 9 is threadedly sealed to the upper plug 8, the probe 11 is placed in the through hole 10a of the pressure relief valve core, and is threadedly connected to the probe lock 12 located on the step 10b of the pressure relief valve core, and a pressure scale line is provided on the probe 11; the pressure relief valve core 10 is threadedly connected to the inner cavity 9b of the pressure relief valve seat.

[0011] By the attached Figure 1 And attached Figure 5 , 6 As shown, the one-way valve 6 is placed in the inner cavity 1a of the side valve seat and is seated on the lower plug 7; a sealing ring 6b is provided on the one-way valve 6. If the sealing surface of the side valve plate 3 is worn and cannot be sealed, the drilling fluid flows through the inner cavity 6a of the one-way valve and impacts the second plane 6d of the one-way valve to push the one-way valve 6 to move in the inner cavity 1a of the side valve seat; the conical annular surface 6e of the one-way valve is in contact and sealed with the first conical annular surface 1b of the side valve seat to achieve the closed seal of the second one-way valve 6. During the side circulation, the drilling fluid directly impacts the first plane 6c of the one-way valve to push the one-way valve 6 downward and limit it above the lower plug 7. At this time, the drilling fluid turns to flow into the one-way valve inner cavity 6a through the side hole 6f of the one-way valve and flows through the through hole 7a of the lower plug, and finally acts on the upper plane 3c of the side valve plate to overcome the torsion of the torsion spring 5, so that the side valve plate 3 is opened at a certain angle, thereby achieving the connection between the side valve and the main channel 2a.

[0012] By the attached Figure 7 , 8 , 9, it is characterized in that: when there is pressure in the side valve seat 1, the probe 11 will be instantly bounced up, and the pressure relief valve seat 9 has small pressure relief holes 9a evenly distributed along the circumferential direction. The pressure relief valve core 10 is rotated to above the pressure relief holes 9a, so that the pressure relief holes 9a are connected with the outside and relieve pressure, forming a first-stage pressure relief device; the pressure relief valve seat 9 is threadedly connected to the upper plug 8, and the knob is pulled out of the pressure relief valve seat 9 to continue to remove the residual pressure, forming a second-stage pressure relief device; the upper plug 8 is threadedly connected to the through hole 1d on the side valve seat, and the upper plug 8 is removed by a special tool, and the residual pressure will be completely released, forming a third-stage pressure relief device; the three-stage pressure relief device uses a pressure relief method to relieve pressure inside the side valve seat 1 when switching between continuous cycles, thereby ensuring safe operation of the side cycle.

[0013] The working principle of the three-stage pressure relief continuous circulation valve side valve tool of the present invention is as follows: During the positive cycle, the side valve plate automatically seals with the side valve seat through the torsion spring on the rotary pin shaft to prevent high-pressure fluid from entering the side valve seat. At this time, the probe in the pressure relief device is not popped up, the side valve seat is in a pressure-free leakage state, and the one-way valve is in a static state. During the positive cycle, if the side valve plate is partially punctured, the high-pressure fluid will enter the side valve seat to form a pressure difference, and the one-way valve is pushed upward, so that the one-way valve and the conical annular surface of the side valve seat are combined to form a high-pressure seal, which curbs the continued occurrence of puncture leakage; during the side cycle, first observe the probe pressure scale line, conduct a leakage pressure test on the side valve seat, and then unload the residual pressure by turning the knob pressure relief valve core. Remove the upper plug when there is no puncture leakage and the pressure is completely relieved, and connect the high-pressure pipeline to the side valve seat through threads. Then the high-pressure fluid continues to act on the side valve plate through the inner cavity of the one-way valve, so that the side valve plate is in a normally open state, thereby realizing the conversion from positive cycle to side cycle.

[0014] The specific implementation methods described above are used to illustrate this patent rather than to limit the scope of this patent. Any equivalent changes and modifications made by any technician in this field without departing from the concept and principle of this patent are within the scope of protection of this patent system.

Claims

1. A three-stage pressure relief continuous circulation valve side valve tool, mainly composed of a side valve seat, a side valve plate, a rotary pin, a torsion spring, a lower plug, a check valve, a three-stage pressure relief device, etc., characterized in that; The side valve seat (1) is seated on the valve body (2) through a threaded connection; the side valve seat (1) has an inner cavity (1a) adapted to the one-way valve (6); the one-way valve (6) is inserted into the inner cavity (1a) of the side valve seat from bottom to top; the lower plug (7) is threadedly connected to the inner cavity (1a) of the side valve seat; the one-way valve (6) is seated on the lower plug (7) and is restricted from moving downward; the three-stage pressure relief device comprises an upper plug (8), a pressure relief valve seat (9), a pressure relief valve core (10 ), a probe (11), and a probe lock (12); the upper plug (8) is threadedly connected to the through hole (1d) on the side valve seat; the pressure relief valve seat (9) is threadedly sealed with the upper plug (8); the probe (11) is placed in the through hole (10a) of the pressure relief valve core and is threadedly connected to the probe lock (12) located on the step (10b) of the pressure relief valve core; a pressure scale line is provided on the probe (11); the pressure relief valve core (10) is threadedly connected to the inner cavity (9b) of the pressure relief valve seat.

2. A three-stage pressure relief continuous circulation valve side valve tool according to claim 1, characterized in that: The one-way valve (6) is placed in the inner cavity (1a) of the side valve seat and is seated on the lower plug (7); a sealing ring (6b) is provided on the one-way valve (6); if the sealing surface of the side valve plate (3) is worn and cannot be sealed, the drilling fluid flows through the inner cavity (6a) of the one-way valve, impacting the second plane (6d) of the one-way valve and pushing the one-way valve (6) to move in the inner cavity (1a) of the side valve seat; the conical annular surface (6e) of the one-way valve is in contact and sealed with the first conical annular surface (1b) of the side valve seat, thereby achieving the first The two-way one-way valve (6) is closed and sealed. During the side circulation, the drilling fluid directly impacts the first plane (6c) of the one-way valve to push the one-way valve (6) downward and limit it above the lower plug (7). At this time, the drilling fluid flows into the inner cavity (6a) of the one-way valve through the side hole (6f) of the one-way valve and flows through the through hole (7a) of the lower plug. Finally, it acts on the plane (3c) on the side valve plate to overcome the torsion of the torsion spring (5), so that the side valve plate (3) opens at a certain angle, thereby realizing the connection between the side valve and the main channel (2a).

3. A three-stage pressure relief continuous circulation valve side valve tool according to claim 1, characterized in that: When there is pressure in the side valve seat (1), the probe (11) will be instantly popped up. There are small pressure relief holes (9a) evenly distributed along the circumference in the pressure relief valve seat (9). The pressure relief valve core (10) is rotated to the pressure relief hole (9a) so that the pressure relief hole (9a) is connected to the outside and relieves pressure, forming a first-stage pressure relief device; the pressure relief valve seat (9) is threadedly connected to the upper plug (8). The knob is pulled out of the pressure relief valve seat (9) to continue to discharge the residual pressure, forming a second-stage pressure relief device; the upper plug (8) is threadedly connected to the through hole (1d) on the side valve seat. The upper plug (8) is removed by a special tool, and the residual pressure will be completely released, forming a third-stage pressure relief device; when the three-stage pressure relief device is switched in a continuous cycle, the pressure is relieved inside the side valve seat (1) by a pressure relief method to ensure the safe operation of the side cycle.

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