CN114645673A

CN114645673A - Continuous circulation drilling system and process

Info

Publication number: CN114645673A
Application number: CN202111386970.6A
Authority: CN
Inventors: 刘殿琛; 许期聪; 周长虹; 徐忠祥; 何虹; 范黎明; 李宬晓; 王虎; 蒋杰; 王跃江
Original assignee: China National Petroleum Corp; CNPC Chuanqing Drilling Engineering Co Ltd
Current assignee: China National Petroleum Corp; CNPC Chuanqing Drilling Engineering Co Ltd
Priority date: 2021-11-22
Filing date: 2021-11-22
Publication date: 2022-06-21

Abstract

The invention provides a continuous circulation drilling system and a process, wherein the continuous circulation drilling system comprises a continuous circulation valve and a safe and quick operation mechanism for valve type continuous circulation drilling, and the operation mechanism comprises a quick connection device. A side outlet is formed on the side wall of the continuous circulating valve; the quick connection device comprises a clamping unit, a connector and a locking unit, wherein the clamping unit is used for clamping the continuous circulating valve; one end of the connector is used for being connected with the side outlet, and the other end of the connector is connected to a side circulation pipeline; the locking unit drives the connecting head to be close to or far away from the side outlet under the condition that the clamping unit clamps the continuous circulating valve, so that the connecting head and the continuous circulating valve are locked or unlocked. The safe and rapid operating mechanism for the valve type continuous cycle drilling greatly reduces the risk of injury of personnel operating on the drilling floor, and improves the high efficiency, reliability and safety in the continuous cycle drilling operation process.

Description

Continuous circulation drilling system and process

Technical Field

The invention relates to the technical field of oil and gas drilling, in particular to the technical field of continuous circulation drilling in oil and gas drilling, which is used for a drilling system for continuously circulating a circulating medium during column connection (or single column) or tripping in and out in the oil and gas drilling process, and more particularly relates to a continuous circulation drilling system and a process.

Background

At present, during the process of connecting a single joint (upright post) or tripping in an oil drilling well, the circulation of drilling fluid needs to be stopped. Stopping the circulation of the drilling fluid will generate negative pressure excitation to the bottom of the well, which may cause accidents such as well kick, gas invasion, well wall collapse, blockage, drilling tool burying and the like due to the fact that the pressure of the bottom of the well is lower than the pore pressure of the stratum. After the connection of a single joint (upright post), the pump is restarted, positive pressure excitation is caused, so that the pressure at the bottom of the well is higher than that in normal circulation, even exceeds the formation fracture pressure, the problems of fracturing loss, differential pressure drill sticking and the like are caused, the well quality is reduced, and a plurality of potential difficulties are brought to subsequent operation, particularly casing well cementation.

When gas drilling operation is carried out, due to the fact that a large-belly well hole is large in number and irregular in well hole, when circulation is stopped, rock debris in the well hole is prone to rapidly settling, sand setting and drilling are caused, and particularly in a stratum with large sand setting, damage is large. In a micro water-out stratum, after the circulation is interrupted, stratum water is gathered to soak a well wall, and the instability of the well wall can be seriously caused, so that the gas drilling can not be implemented. The atomization/inflation drilling is carried out in deep layer, after the circulation is interrupted, the stable time of re-establishing the circulating pressure is longer, and the aging is reduced.

The continuous circulation drilling technology breaks through the traditional mode, and in the process of connecting a single column (upright column) and tripping in and out, the continuous circulation of drilling media is kept, the well bottom is continuously cleaned, the well bottom pressure is kept relatively stable, and all underground complications and accidents caused by circulation interruption can be avoided. For gas drilling, the gas-phase medium is kept to continuously circulate, so that the well is favorably cleaned, sand setting and drilling blockage are avoided, the drilling footage of the gas drilling in a complex layer section is prolonged, and the safety of the gas drilling is improved.

The valve type continuous circulation drilling system mainly comprises a continuous circulation control system and a continuous circulation valve. The continuous circulating valve usually comprises a main valve and a side valve, wherein the main valve is matched at the top end of a single (stand column), a single (stand column) with the continuous circulating valve is drilled, a side circulating pipeline is connected to the side valve to switch a side circulating channel, and forward switching is carried out after the single (stand column) is connected and disconnected, so that the drilling process with uninterrupted circulating media in the processes of tripping and connecting the single (stand column) is realized.

Chinese patent publication No. 202467689U discloses a drilling continuous circulation nipple, which includes an outer sleeve, an upper valve plate mechanism is provided on the upper part in the outer sleeve, the upper valve plate mechanism includes a snap spring, a valve seat and a through valve plate connected with the valve seat through a hinge member, and is characterized in that: and one side of the lower part in the outer sleeve is provided with a bypass port, a lower valve plate mechanism is arranged at the bypass port and comprises a bypass valve seat, a sealing ring and a bypass valve plate, the bypass valve seat is connected with the outer sleeve, the bypass valve plate is connected with the bypass valve seat through an articulated piece and a torsional spring, and one side of the bypass valve plate is provided with a plug. The double-valve plate mechanism on the drilling continuous circulation short section can be used for achieving conversion between a bypass channel on a tool and a main channel connected with a top drive, however, at present, a main valve and a side valve of a continuous circulation valve are plate valves, the main valve of the structure is in a normally open state, and only when certain pressure is formed at the lower part of the main valve, the main valve can be in a closed state, the main valve does not have an active sealing function, and certain safety risks exist. When continuous circulation drilling operation is implemented, before a side circulation pipeline is connected, the tightness of a side valve needs to be detected, and if the side valve has a puncture, a cover plate of the side valve is opened, pressure injection is easy to cause injury to people. In the drilling process, the continuous circulating valve enters the well while drilling, and is influenced by vibration of a drilling tool, and a side valve of the continuous circulating valve is easy to fall off to cause underground accidents.

In addition, when the conventional drilling operation is used for dismounting and connecting a stand column (or a single stand column) or tripping up and tripping down a drill string, a pump must be stopped to stop the underground circulation, and the problems of well wall collapse, underground sand settling, drill sticking and other underground complicacies, large pressure fluctuation at the bottom of a well, high well control risk and the like can be caused after the circulation is interrupted. The valve type continuous circulation well drilling technology can realize continuous circulation of well drilling medium in the process of disassembling and assembling upright columns (or single columns) or disassembling and assembling drill strings, thereby eliminating the complex underground problem caused by circulation interruption and achieving the purpose of safe and rapid well drilling.

The existing valve type continuous circulation drilling equipment is large in occupied area, scattered, inconvenient to assemble, disassemble and install, complex to operate in a control cabinet, and particularly, the side circulation pipeline connection and disassembly operation steps are multiple, the consumed time is long, and the operation is realized by matching of a plurality of operating personnel, so that the whole continuous circulation drilling mechanism is complex to operate, the consumed time is long, and certain safety risks exist.

Disclosure of Invention

The present invention aims to address at least one of the above-mentioned deficiencies of the prior art. For example, one of the purposes of the invention is to provide a safe and rapid operation mechanism for valve type continuous circulation drilling, which solves the problems of scattered valve type continuous circulation drilling equipment, multiple connection operation steps of side circulation pipelines, high labor intensity of operators and long time consumption, greatly reduces the injury risk of personnel operating on a drilling platform, and improves the efficiency, reliability and safety in the continuous circulation drilling operation process.

For another example, the technical problems in the prior art are solved: (1) the main valves of the continuous circulating valve are plate valves, do not have an active sealing function, and have certain safety risks; (2) when the side valve has a puncture, the cover plate of the side valve is opened, so that pressure injection easily injures people; (3) the continuous circulation valve enters the well while drilling, and is affected by vibration of a drilling tool, and a side valve of the continuous circulation valve is easy to fall off to cause an underground accident.

In order to achieve the aim, the invention provides a continuous circulation drilling system, which comprises a continuous circulation valve and a safe and quick operation mechanism for valve type continuous circulation drilling, wherein a side outlet is formed in the side wall of the continuous circulation valve; the operating mechanism includes quick-connect device, and quick-connect device includes: a clamping unit for clamping the continuous circulation valve; one end of the connector is connected with the side outlet, and the other end of the connector is connected to the side circulation pipeline; and a locking unit which drives the connection head to approach or depart from the side outlet under the condition that the continuous circulating valve is clamped by the clamping unit, so that the connection head is locked or unlocked with the continuous circulating valve.

In one exemplary embodiment of the present invention, the clamping unit may include: the inner cavity of the shell is hollow, an opening is formed in one side of the inner cavity, an arc-shaped open slot is formed in one side of the shell, and the arc-shaped open slot corresponds to the surface of one side of the continuous circulating valve; and the backboard can be arranged at the opening in an opening and closing manner, a curved surface corresponding to the other side surface of the continuous circulating valve is formed on the backboard, one side surface of the continuous circulating valve is opposite to the other side surface of the continuous circulating valve, and a clamping opening for clamping the continuous circulating valve is formed between the curved surface and the arc-shaped opening groove in the state that the backboard closes the opening.

In an exemplary embodiment of the present invention, the locking unit may be a linear expansion driving mechanism disposed in the housing, one end of the linear expansion driving mechanism being connected to the back plate, the other end being connected to the other end of the connecting head, and one end of the connecting head and the side outlet being coupled to or separated from each other by linear expansion of the linear expansion driving mechanism.

In an exemplary embodiment of the present invention, the linear expansion driving mechanism may be a pneumatic hydraulic device, a hydraulic device or an electro-hydraulic device, a cylinder of the linear expansion driving mechanism is connected to the back plate, an end of a piston rod of the linear expansion driving mechanism is connected to the connecting head through a fixing plate, and the fixing plate extends radially outward from the connecting head near the other end.

In an exemplary embodiment of the present invention, one side of the back plate may be connected to one side of the case where the opening is formed, by a first connection member; the other side of the back plate opposite to one side is connected to the other side of the shell opposite to one side through a second connecting piece. The first connector may include: a first back plate pin hole formed at one end of the back plate; the first pin extends in the hole axis direction of the first back plate pin hole and can be matched with the first back plate pin hole; the locking unit is provided with a first chain fixed pin hole, and the first chain fixed pin hole and the first back plate pin hole are matched with the first pin to connect one end of the back plate to the locking unit. The second connector may include: a second back plate pin hole formed at the other end of the back plate; the second pin extends in the hole axis direction of the second back plate pin hole and can be matched with the second back plate pin hole; the locking unit is provided with a second chain fixed pin hole, and the second chain fixed pin hole, the second back plate pin hole and the second pin are matched with the second pin to clamp or release the other end of the back plate.

In an exemplary embodiment of the present invention, a control button for controlling the locking unit may be provided on an outer wall of the housing.

In an exemplary embodiment of the present invention, the inner side of the side outlet may be provided with a sealing groove for installing a sealing ring.

In an exemplary embodiment of the invention, one end of the continuous circulation valve connected with the headrest may be provided with a backstop ring, the inner side of the side outlet is provided with backstop teeth, and the backstop ring and the backstop teeth cooperate to limit free movement of the connector.

In one exemplary embodiment of the invention, the end of the continuous circulation valve connecting the headrest may be of a truncated cone design.

In an exemplary embodiment of the invention, one end of the continuous circulation valve may be adapted to be connected to a main circulation line, the work implement further comprises a flow path switching control device, and the flow path switching control device may comprise: the manifold is skid-mounted and used for switching the connection of the continuous circulating valve and the main circulating pipeline or the side circulating pipeline; and the control operation chamber is used for monitoring and receiving pressure information of the main circulation pipeline and the side circulation pipeline to control the skid-mounted manifold so as to realize switching of the main circulation pipeline and the side circulation pipeline.

In an exemplary embodiment of the present invention, the continuous circulation valve may include a valve body having a hollow interior and an arrow-type main valve disposed in an upper end of the valve body, the arrow-type main valve being coaxially arranged with the valve body and including a support seat mounted in the valve body through a sidewall thereof, a first through hole and a first fluid passage formed in the support seat, a pressing cap mounted in the valve body, a second through hole and a second fluid passage formed in the pressing cap, the second through hole being coaxially arranged with the first through hole, the sealing arrow may include a sealing arrow body, a sealing portion and a centering sleeve mounting portion connected in sequence, a lower end of the sealing arrow may be inserted into the first through hole, an upper end of the sealing arrow may be inserted into the second through hole, the sealing portion protrudes outward from the sealing arrow body and an outer edge of the sealing portion may contact with the sidewall of the pressing cap to form a sealing surface The utility model discloses a seal arrow body, it is sealed that the supporting seat is provided with the supporting seat, right set installation department and be located seal portion below and right set installation department outwards outstanding from sealed arrow body, the external diameter of right set installation department equals or slightly is less than right the internal diameter of cover, right the upper end suit of cover on right set installation department, right the axial length of cover and be less than the distance between the up end of terminal surface and supporting seat under the lateral wall of pressure cap, the elastic component suit is in between sealed arrow body and the right cover, the lower extreme of elastic component and the up end contact of supporting seat, the upper end of elastic component and the lower extreme contact of right set installation department, and the elastic component is in compression state.

In an exemplary embodiment of the present invention, the continuous circulation valve may further include a side valve disposed on a sidewall of a lower end of the valve body, the side valve may be a drop-proof side valve, the side valve may include a valve seat, a pin cover, a first fixing pin, and a second fixing pin, the pin cover being fastened to the valve body by the first fixing pin, and the valve seat being fastened to the pin cover by the second fixing pin.

In an exemplary embodiment of the present invention, a gap between the first fixing pin and the pin cover may be covered with an anaerobic adhesive, and a gap between the pin cover and the valve body may be covered with an anaerobic adhesive.

In an exemplary embodiment of the present invention, the continuous circulation valve may further include a side valve disposed on a side wall of the valve body, the side valve being an observable side valve including a valve plate, a valve plate fixing pin, a valve seat, a cover plate, a pressure relief member, the leakage observation member and the leakage observation valve, the valve seat having a third through hole and a pressure relief hole, the third through hole being capable of communicating with an inner hollow of the valve body, the pressure relief hole being in communication with the third through hole, the valve plate being fixed to the valve body by the valve plate fixing pin, the cover plate having an axial stepped through hole, the cover plate being mounted on an inner wall of the valve seat through an outer wall thereof and forming an end face seal with the valve seat, the stepped through hole being coaxial with the third through hole, the pressure relief member being disposed in the pressure relief hole, the leakage observation member having a hollow passage formed therein, and a drain hole communicating with the hollow passage formed in a side wall of the leakage observation member, the leakage observation member being capable of being inserted into the hollow passage through a front end thereof and being capable of moving in the hollow passage to the hollow passage A first position in which the leak observation valve seals the drain hole, and a second position in which there is no contact between the leak observation valve and the drain hole, so that the medium of the hollow channel can be discharged through the drain hole.

In an exemplary embodiment of the invention, the cover plate and the valve seat may be connected by a screw thread, the pressure relief hole communicates from an internal screw thread relief groove of the valve seat to the outside, and the pressure relief member presses against an outer wall of the cover plate.

In an exemplary embodiment of the present invention, the leakage observing member may have a fixing layer and an exhaust layer connected in sequence, and the leakage observing valve has a first sealing portion, a second sealing portion and a third sealing portion connected in sequence and having diameters increasing in sequence, wherein the fixing layer is installed on an inner wall of the cover plate and forms an end surface seal with the cover plate, the exhaust holes are uniformly distributed on the exhaust layer in a circumferential direction, the second sealing portion seals the exhaust holes when the leakage observing valve moves to a first position in the hollow passage, and the exhaust holes are aligned with the third sealing portion when the leakage observing valve moves to a second position in the hollow passage.

In an exemplary embodiment of the present invention, a first sealing member may be further included, and the first sealing member is fitted over the second sealing portion.

In another aspect of the invention, a continuous circulation drilling process is provided, wherein the process comprises one or more of drilling, tripping and tripping, and wherein the rapid connection of the side circulation line to the continuous circulation valve is achieved using the continuous circulation drilling system described above.

In an exemplary embodiment of the present invention, the process may include: pre-connecting the continuous circulation valve with the arrow-shaped main valve to a drill string, wherein the continuous circulation valve with the arrow-shaped main valve is in a main circulation during a drilling action; the drill string receiving operation comprises the following actions of sequentially switching the Nth drill string into a side circulation, connecting the (N + 1) th drill string, starting a main circulation of the (N + 1) th drill string and switching the drill string and the Nth drill string into a main circulation; during a tripping action, the continuous circulation valve is in a main circulation; the drill string unloading operation comprises the following actions which are carried out in sequence, namely, taking out the Mth drill string and the continuous circulation valve part of the Mth drill string, switching the Mth drill string to a side circulation and closing a main circulation of the Mth drill string, unloading the Mth drill string, and switching the Mth drill string to the side circulation; the switching to the side circulation action comprises the steps of sequentially opening a side valve and connecting a side valve input pipeline, controlling to open the side circulation and close the main circulation by using a control system, closing an arrow-shaped main valve and disassembling the arrow-shaped main valve input pipeline; the switching to the main circulation action comprises the steps of sequentially opening the arrow-shaped main valve and connecting an input pipeline of the arrow-shaped main valve, using a control system to control the opening of the main circulation and the closing of the side circulation, closing the side valve and disassembling the input pipeline of the side valve; the side valve input pipeline is connected with the side valve so as to inject a circulating medium into the central channel through the side valve; the arrow-shaped main valve input pipeline is connected with the valve body and the central channel and can inject a circulating medium into the central channel.

Compared with the prior art, the beneficial effects of the invention can include:

1) the integrated house is integrated by the control cabinet and the gate valve manifold prying body, so that the problems that the continuous circulation drilling system is large in occupied area and is scattered and inconvenient to mount, dismount and manage are effectively solved.

2) The invention has simple operation, preliminarily realizes automation and mechanization, and greatly reduces the labor intensity of operators.

3) The invention greatly reduces the number of continuous cycle drilling operation personnel and obviously reduces the personnel cost.

4) The invention reduces the number of drilling platform surface operators, greatly reduces the unsafe risk of the drilling platform surface operators and improves the safety of the operation process.

5) The invention realizes the real-time monitoring of the whole operation process of the drilling platform surface on the ground control cabinet, and the drilling parameters, particularly the pressure of the main circulation channel and the pressure of the side circulation channel are displayed on the display of the ground control cabinet in a centralized way, thereby obviously improving the safety of the operation process.

6) The invention changes the connection operation of the side circulation pipeline and the continuous circulation short section from manual connection into the quick connection of the side circulation pipeline connector and the side outlet of the continuous circulation short section through the quick connection device, and simultaneously realizes safe sealing by using an electric hydraulic device (or a pneumatic/hydraulic device), thereby improving the high efficiency, reliability and safety of connection.

7) The arrow-shaped main valve can be actively sealed, so that the operation safety of the continuous circulating valve is greatly improved; the accident that high-pressure gas possibly leaked from the side valve hurts people when the side circulation pipeline is connected can be avoided; the risk that the side valve falls into the well due to vibration in the drilling process can be avoided.

Drawings

FIG. 1 illustrates an operational scenario of a safe and fast operating mechanism for valve-type continuous cycle drilling according to an exemplary embodiment of the present invention;

FIGS. 2(a) and (b) are a block diagram of a gripping unit of a valve type continuous cycle drilling safety and quick-operation mechanism and an internal block diagram of a quick-connection device, respectively, according to an exemplary embodiment of the present invention;

fig. 3(a) and (b) show a cross-sectional view of the connection head of the quick connection device of the valve type continuous circulation drilling safety and quick operation mechanism and a front view of the connection head and a fixing plate, respectively, according to an exemplary embodiment of the present invention;

FIGS. 4(a) and (b) show a cross-sectional view and an elevation view, respectively, of the opening of the continuous circulation valve of a valve continuous circulation drilling safety and fast operating mechanism according to an exemplary embodiment of the present invention;

FIG. 5 illustrates a partial cross-sectional view of the continuous circulation valve in an exemplary embodiment of the invention;

FIG. 6 illustrates a cross-sectional view of the side valve in an exemplary embodiment of the invention;

FIG. 7 illustrates a cross-sectional view of the leak sight in an exemplary embodiment of the invention;

FIG. 8 illustrates a cross-sectional view of the leak observation valve in an exemplary embodiment of the invention.

The reference numerals are explained below:

1-continuous circulation valve, 2-quick connection device, 3-control device, 4-drill floor, 5-drill rod, 6-main circulation line, 7-side circulation line, 8-circulation medium injection device, 31-manifold skid, 32-control operation room, 1 a-side outlet, 21-clamping unit, 22-connector, 23-locking unit, 24-fixing plate, 21 a-opening, 211-housing, 212-back plate, 213-first connector, 214-second connector, 213 a-first back plate pin hole, 213 b-first pin, 214 a-second back plate pin hole, 214 b-second pin, 23 a-first chain fixed pin hole, 23 b-second chain fixed pin hole, 211 a-control button, 211 b-lifting lug, 22 a-retaining ring, 11-sealing groove and 12-retaining tooth.

10-valve body, 20-arrow-shaped main valve, 30-side valve, 40-support seat, 50-sealing arrow, 60-centering sleeve, 70-elastic piece, 80-pressing cap, 90-valve seat, 100-pin cover, 110-first fixing pin, 120-second fixing pin, 130-valve plate, 140-valve plate fixing pin, 150-cover plate, 160-pressure relief hole, 170-leakage observation piece, 180-leakage observation valve, 190-discharge hole, 200-first sealing piece, 210-first fluid channel, 220-second fluid channel, 230-second sealing piece, 240-loading and unloading hole, 250-sealing arrow body, 260-sealing part, 270-centering sleeve mounting part, 280-first sealing part, 290-second sealing part and 300-third sealing part.

Detailed Description

In the following, the continuous circulation drilling system and process of the present invention will be described in detail in connection with exemplary embodiments. Herein, the terms "first," "second," and the like are used for convenience of description and for convenience of distinction, and are not to be construed as indicating or implying relative importance or order of parts.

Fig. 1 is a view showing an operational scenario of a safe and fast operation mechanism for valve type continuous cycle drilling according to an exemplary embodiment of the present invention.

Fig. 2 includes fig. 2(a) and 2(b), which respectively show a structure view of a clamping unit of a safe and rapid operation mechanism for valve type continuous circulation drilling and an internal structure view of a rapid connection device according to an exemplary embodiment of the present invention.

Fig. 3 includes fig. 3(a) and 3(b), which respectively show a cross-sectional view of the connection head of the quick connection device of the valve type continuous circulation drilling safety and quick operation mechanism and a front view of the connection head and the fixing plate according to an exemplary embodiment of the present invention.

Fig. 4, which includes fig. 4(a) and 4(b), shows a sectional view and a front view, respectively, of an opening of a continuous circulation valve of a safe and fast working mechanism for valve continuous circulation drilling according to an exemplary embodiment of the present invention.

In an exemplary embodiment of the invention, as shown in fig. 1 to 3, a continuous circulation drilling system is provided comprising a continuous circulation valve 1 and a safe and fast working mechanism for valve-type continuous circulation drilling, the working mechanism comprising a fast connection device 2.

Wherein, the side wall of the continuous circulating valve 1 is provided with a side outlet 1a, and the side outlet 1a is used for being connected to a side circulating pipeline. The upper end of the continuous circulation valve is intended to be connected to the main circulation line 6. The quick-connect device comprises a clamping unit 21, a connector 22 and a locking unit 23. The clamping unit 21 is used for clamping the continuous circulation valve 1; one end of the connection head 22 is for connection with the side outlet 1a, and the other end is connected to the side circulation line 7; the locking unit 23 drives the connection head 22 to approach or separate from the side outlet 1a with the continuous circulation valve 1 clamped by the clamping unit 21, to lock or unlock the connection head 22 with the continuous circulation valve 1.

The safe and quick operation mechanism for valve type continuous circulation drilling greatly reduces the injury risk of personnel operating on the drilling floor, and improves the high efficiency, reliability and safety in the continuous circulation drilling operation process. In addition, the high efficiency and reliability of the connection of the quick-connect apparatus with the continuous circulation valve 1 can be improved by the arrangement of the grip unit 21 and the locking unit 23 of the quick-connect apparatus.

As shown in fig. 2, the clamping unit 21 may include a housing 211 and a back plate 212. The inner cavity of the housing 211 is hollow and has an opening 21a at one side, and an arc-shaped opening groove corresponding to one side surface of the continuous circulation valve is formed at one side of the housing. The back plate 212 is openably and closably disposed at the opening 21a, a curved surface corresponding to the other side surface of the continuous circulation valve is formed on the back plate 212, the one side surface and the other side surface of the continuous circulation valve are opposite, and a clamping opening for clamping the continuous circulation valve is formed between the curved surface and the arc-shaped opening groove in a state that the opening 21a is closed by the back plate. Here, the curved surface and the arc-shaped opening groove may be in close contact with opposite side surfaces of the continuous circulation valve, respectively, to thereby clamp the continuous circulation valve.

The locking unit 23 may be a linear expansion driving mechanism disposed in the housing, one end of the linear expansion driving mechanism is connected to the back plate 212, and the other end is connected to the other end of the connecting head 22, and one end of the connecting head 22 and the side outlet 1a are coupled to each other or separated from each other by linear expansion of the linear expansion driving mechanism.

The linear telescopic driving mechanism can be a pneumatic hydraulic device, a hydraulic device or an electric hydraulic device, a cylinder body of the linear telescopic driving mechanism is connected with the back plate 212, the end part of a piston rod of the linear telescopic driving mechanism is connected to the connecting head 22 through a fixing plate 24, and the fixing plate 24 extends outwards from the other end, close to the connecting head 22, of the connecting head in the radial direction. For example, as shown in fig. 2 and 3, the linear-expansion driving mechanism has two small holes formed at both ends of the fixed plate 24, and the linear-expansion driving mechanism is connected to the fixed plate 24 through the small holes.

As shown in fig. 2, one side of the back plate 212 may be connected to one side of the housing 211 forming the opening 21a by a first connection member 213; the other side of the back plate 212 opposite to one side is connected to the other side of the housing 211 opposite to one side by a second connector 214, and the first connector 213 includes a first back plate pin hole 213a and a first pin 213 b. A first back plate pin hole 213a is formed at one end of the back plate 212; the first pins 213b extend in the hole axis direction of the first backplate pin holes 213a, and can be engaged with the first backplate pin holes 213 a; wherein the locking unit 23 is provided with a first chain pin hole 23a, and the first chain pin hole 23a and the first back plate pin hole 213a cooperate with the first pin 213b to connect one end of the back plate 212 to the locking unit 23. The second connector 214 includes a second back plate pin hole 214a and a second pin 214 b. A second back plate pin hole 214a is formed at the other end of the back plate; the second pins 214b extend in the hole axis direction of the second back plate pin holes 214a, and can be engaged with the second back plate pin holes 214 a; the locking unit 23 is provided with a second chain pin hole 23b, and the second chain pin hole 23b and the second back plate pin hole 214a cooperate with the second pin 214b to hold or release the other end of the back plate 212 to connect the locking unit 23.

The first connector 213 is not limited to the above-described components and is not necessarily a component as long as it can connect one side of the back plate 212 to the locking unit 23. For example, one end of the back plate 212 is welded to the locking unit 23, and for example, one end of the back plate 212 and the locking unit 23 are connected together by using a screw connection. The second connecting member 214 is also not limited to the above-described components as long as it can connect the other side of the back panel to the locking unit 23 and can perform clasping or unclamping (i.e., opening or closing). Such as a threaded connection, a snap connection, etc.

As shown in fig. 2, a control button 211a for controlling the locking unit 23 may be provided on an outer wall of the housing 211.

Further, as shown in fig. 1 and 2, the outer wall of the housing 211 may be provided with a lifting lug 211b, by which the height of the quick coupling device can be fixed. The lifting lug 211b is arranged and fixed through the lifting lug 211b during working, so that the risk that the side circulation pipeline 7 falls off during the connection process of the side circulation pipeline 7 and the injection of a circulation medium can be avoided.

As shown in fig. 3, the inner side of the side outlet 1a may be provided with a seal groove 11 for installing a seal ring. Through the sealing groove 11 and the sealing ring arranged in the sealing groove 11, the sealing connection between the opening of the continuous circulating valve and the connector of the quick connecting device can be efficiently realized. For example, an "O" ring groove is formed at the side outlet 1a of the continuous circulation valve, and can be used for installing an "O" ring to seal the connection joint between the side outlet 1a of the continuous circulation valve and the quick connection device.

As shown in fig. 2, 3 and 4, the end of the connection head 22 close to the continuous circulation valve 1 may be provided with a check ring 22a, the inner side of the side outlet 1a is provided with check teeth 12, and the check ring 22a cooperates with the check teeth 12 to limit the free movement of the connection head 22. That is, when the joining head 22 is connected to the continuous circulation valve 1, the check ring 22a on the joining head 22 can be engaged with the check tooth 12 in the side outlet 1a, so that the joining head 22 cannot move freely. As shown in fig. 3, four retaining teeth 12 may be uniformly distributed on the inner sidewall of the side outlet 1a, and a single retaining tooth 12 may be serrated; the check ring 22a may be formed in a ring belt shape at one end of the connection head 22 connected to the continuous circulation valve 1; when the connection head 22 is connected to the continuous circulation valve 1, the four retaining teeth 12 can be engaged with the annular retaining ring 22a, thereby limiting the free movement of the connection head 22.

As shown in fig. 2 and 3, the connection head 22 may be of a truncated cone design at the end of the continuous circulation valve. Correspondingly, the side outlet 1a is provided with a configuration which cooperates with a coupling head 22 of truncated-cone design, which coupling head 22 is guided by the truncated-cone design of the coupling head 22 for quick connection to the opening of the continuous circulation valve. For example, the connecting head 22 is machined into a truncated cone shape at an angle of 5 to 20 ° near one end of the continuous circulation valve 1, and a small end is near one end of the continuous circulation valve 1, so that the connecting head 22 can be quickly inserted into the side outlet 1a of the continuous circulation valve 1. In addition, the connecting head 22 designed in a truncated cone shape may be formed with a retaining ring 22a, which enables the retaining ring 22a to more efficiently cooperate with the retaining teeth 12 to restrict the connecting head 22 from freely moving.

As shown in fig. 1, one end of the continuous circulation valve 1 is used for connecting with a main circulation line 6, the working mechanism may further include a flow passage switching control device 3, and the flow passage switching control device 3 may include a manifold skid 31 and a control operation room 32. The manifold skid-mounted device 31 is used for switching the connection of the continuous circulating valve 1 with the main circulating pipeline 6 or the side circulating pipeline 7; the control operation chamber 32 monitors and receives pressure information of the main circulation line 6 and the side circulation line 7 to control the manifold skid 31 to realize switching of the main circulation line 6 and the side circulation line 7.

In the present invention, the main circulation line 6 refers to a line connecting the risers from the manifold skid 31 and passing through the main valve of the continuous circulation valve 1, and the side circulation line 7 refers to a line passing through the side valve of the continuous circulation valve 1 from the manifold skid 31.

The manifold skid 31 is a flow channel switching gate valve and pipeline combination device commonly used in the field, and can control the flow channel switching between the main circulation pipeline 6 and the side circulation pipeline 7 by opening/closing the corresponding gate valve, and can also release the pressure of the main circulation pipeline 6 and the side circulation pipeline 7, which is not described in detail herein.

The control console 32 may be a conventional intelligent device or system designed or purchased, programmed, and adapted to perform the functions of detecting, receiving information, controlling, etc. of the present invention.

Fig. 1 is an operation scene diagram of the safe and rapid operation mechanism for valve type continuous circulation drilling. During drilling or circulating tripping, the circulating medium enters the wellbore through the front hole of the drilling tool, in which case the main circulation line 6 is open and the side circulation line 7 is closed. When the upright column (or a single column) needs to be connected and disconnected, the quick connecting device 2 is firstly connected to the side outlet 1a of the continuous circulating valve 1 and locked; then the control operation room 32 controls the manifold skid-mounted device 31 to switch the circulation channel from the main circulation pipeline 6 to the side circulation pipeline 7, the gate valve between the manifold skid-mounted device 31 and the main circulation pipeline 6 is closed, and the control operation room 32 detects and controls the pressure in the main circulation pipeline 6 to be discharged to zero; then, the screw thread between the continuous circulating valve 1 and the top drive, the kelly bar or the drill bar at the upper part of the continuous circulating valve is disassembled, and the upright columns (or single columns) are connected and disassembled, and then the continuous circulating valve 1 is connected; and finally, the control operation room 32 controls the manifold skid-mounted device 31 to switch the circulation channel from the side circulation pipeline 7 to the main circulation pipeline 6, a gate valve between the manifold skid-mounted device 31 and the side circulation pipeline 7 is closed, the control operation room 32 detects and controls the pressure in the side circulation pipeline 7 to be released to zero, the quick connection device 2 is dismantled, and drilling or circulating tripping operation is resumed.

In another exemplary embodiment, a safe and fast operating mechanism for valve type continuous circulation drilling is provided, which comprises a continuous circulation valve, a fast connecting device and a flow passage switching control device. The side outlet of the continuous circulating valve and the conical end surface of the connector of the side circulating pipeline are sealed by adopting an O-shaped rubber ring, the quick connecting device of the side outlet comprises a quick connecting head, the connecting head is welded with a fixed plate and is fixed on an electric hydraulic locking device (or a pneumatic/hydraulic device) telescopic rod through a bolt, the electric hydraulic locking device and a back plate are connected together through a back plate chain fixed end pin, a handle on the back plate can be conveniently opened and closed, the movable end pin hole and the movable end pin hole of the back plate are aligned, the quick connecting device is clamped by the quick connecting device in the movable end pin inserting hole, a pressure display panel is arranged on a shell of the quick connecting device, the working pressure of the electric hydraulic device and the pressure of a circulating medium in the side circulating pipeline can be observed, a locking and unlocking control button is arranged on the shell to realize the locking of the connector of the side circulating pipeline and the continuous circulating valve, And the flow channel switching control device comprises a manifold skid-mounted and control operation room, and a video display, a parameter display and a console are assembled in the control operation room.

In another exemplary embodiment, a safe and fast operating mechanism for valve type continuous circulation drilling is provided, which comprises a continuous circulation valve, a fast connecting device and a flow passage switching control device. The inner end face of the side outlet of the continuous circulating valve is provided with an O-shaped rubber ring groove for placing an O-shaped rubber ring, telescopic stopping teeth are evenly embedded on the circumference of the side outlet of the continuous circulating valve and are matched with the stopping ring at the conical end of the connector, the continuous circulating valve is connected to the top end of a single (or an upright) of a drill rod, and when the single (or the upright) is dismounted and connected, the continuous circulating valve needs to be lifted to the surface of a drilling table, an elevator or a slip is well seated, and a side circulating pipeline is connected.

The quick connecting device is internally provided with a connector, the connector is welded with the fixed plate and is fixed on an electric hydraulic locking device (or a pneumatic/hydraulic device) telescopic rod through a bolt, the electric hydraulic locking device is connected with the back plate chain fixed end pin hole, the chain fixed end pin and the chain fixed end pin hole on the back plate through the back plate chain fixed end pin hole, the handle can conveniently open and close the back plate, after the connector is connected with a side outlet of the continuous circulating valve, the movable end pin hole and the movable end pin hole of the back plate are aligned, the movable end pin hole is inserted to realize that the quick connecting device embraces the continuous circulating valve, a pressure display panel is arranged on a shell of the quick connecting device, the working pressure of the electric hydraulic device and the pressure of a circulating medium in a side circulating pipeline can be observed, and a locking and unlocking control button is arranged on the shell to realize the locking of the side circulating pipeline, the connector and the continuous circulating valve, And when the hoisting lug is loosened, the top of the shell is provided with a hoisting lug, so that the pneumatic winch can be conveniently hoisted.

The flow channel switching control device can comprise a manifold skid-mounted control operation chamber, and can realize the switching of a main circulation pipeline and a side circulation pipeline, wherein a video display is assembled in the control operation chamber, a parameter display and a control console are assembled in the control operation chamber, the video display can monitor the whole operation process on the drill floor in real time, misoperation is prevented, operation safety is ensured, the parameter display can display the pressure in the main circulation pipeline and the side circulation pipeline, the switching of the main circulation pipeline and the side circulation pipeline can be closely monitored, the pressure relief is finished, and the safety of the continuous circulation valve main, the side valve upper and the shackle is ensured.

The invention provides a valve type continuous circulation drilling safety and rapid operation mechanism, relates to the technical field of drilling of continuous circulation of a circulation medium in oil-gas drilling, solves the problems of multiple operation steps and long time consumption of side circulation pipeline connection in the conventional continuous circulation drilling system, solves the problems of large occupied area, scattered inconvenience in assembly, disassembly, installation and management of a main circulation channel control system and a side circulation channel control system of continuous circulation drilling, and simultaneously avoids the risk of slide buckle and falling of the side circulation pipeline in the connection process of the side circulation pipeline and the injection of the circulation medium. The invention mainly comprises a side outlet quick connecting device and a flow channel switching control device, wherein the side outlet quick connecting device comprises a quick connector, an electro-hydraulic locking device (or a pneumatic/hydraulic device), a pressure display panel and a locking and unlocking control button; the flow channel switching control device comprises a manifold skid-mounted control operation room, wherein a video display, a parameter display and a console are assembled in the control operation room. The invention can reduce the labor intensity of valve type continuous circulation drilling operators, preliminarily realize automation and mechanization, improve the efficiency and reliability of connection between the side outlet of the continuous circulation valve and the side circulation pipeline, increase a video display for real-time operation of the drilling floor surface and a pressure monitoring display of the main circulation pipeline and the side circulation pipeline in the ground control operation room, effectively improve the matching safety of the drilling floor and the ground operators and ensure the safety of the operators.

The invention also provides a continuous circulation drilling process comprising one or more of drilling, taking a drill string, tripping a drill string and tripping a drill string, wherein the rapid connection of the side circulation line to the continuous circulation valve is achieved using a continuous circulation drilling system as described above.

FIG. 6 illustrates a cross-sectional view of the side valve in an exemplary embodiment of the invention; FIG. 7 illustrates a cross-sectional view of the leak sight in an exemplary embodiment of the invention; FIG. 8 illustrates a cross-sectional view of the leak observation valve in an exemplary embodiment of the invention.

In an exemplary embodiment, as shown in fig. 5, the continuous circulation valve may be a continuous circulation valve having an arrow-type main valve, which includes a valve body 10 having a hollow interior, an arrow-type main valve 20 disposed at the top of the valve body, and a side valve 30 disposed at the side of the valve body.

The arrow-type main valve 20 may be an arrow-type valve arranged coaxially with the valve body 10. The arrow-type master valve 20 may include a support seat 40, a seal arrow 50, a centering sleeve 60, a resilient member 70, and a pressure cap 80.

The support seat 40 may be installed in the valve body 10 through a sidewall thereof, and the support seat 40 is formed with a first through-hole and a first fluid passage 210.

The pressing cap 80 is installed in the valve body 10, and a second through hole and a second fluid passage 220 may be formed on the pressing cap 80, the second through hole being coaxially arranged with the first through hole.

As shown in fig. 5 and 6, the seal dart 50 includes a seal dart body 250, a seal portion 260, and a centralizing sleeve mounting portion 270, which are connected in sequence. The lower end of the sealing arrow 50 can be inserted into the first through hole, and the upper end of the sealing arrow 50 can be inserted into the second through hole. The sealing portion 260 protrudes outwardly from the seal dart body 250 and the outer edge of the sealing portion 260 can contact the sidewall of the gland 80 to form a sealing surface, thereby sealing the first fluid channel 210. The centralizing sleeve mounting portion 270 is located on the underside of the seal portion 260 and the centralizing sleeve mounting portion 270 protrudes outward from the seal dart body 250, the external diameter of the centralizing sleeve mounting portion 270 being equal to or slightly less than the internal diameter of the centralizing sleeve 60.

The upper end of the centering sleeve 60 is sleeved on the centering sleeve mounting part 270, and the axial length of the centering sleeve 60 is smaller than the distance between the lower end face of the side wall of the pressing cap 80 and the upper end face of the support seat 40.

The elastic part 70 is sleeved between the sealing arrow body 250 and the righting sleeve 60, the lower end of the elastic part 70 is in contact with the upper end face of the supporting seat 40, the upper end of the elastic part is in contact with the righting sleeve mounting part, and the elastic part 70 is in a compressed state.

The continuous circulation valve may have two states of open and closed.

When the continuous circulating valve is switched to the opening state, namely the continuous circulating state is switched to the main circulation, pressure brought by the circulating medium acts on the sealing part, so that the sealing arrow moves downwards, the sealing part is not in contact with the pressure cap, and the first fluid channel is opened. When the sealing arrow goes down, the righting sleeve can be in contact with the supporting seat, and then the downward distance of the sealing arrow is limited, so that the sealing part cannot seal the second fluid channel.

When the continuous circulating valve is switched to a closed state, namely when the continuous circulating state is switched to a side circulation state, under the action of the elastic force of the elastic member in a compressed state, the sealing arrow moves upwards, so that the sealing part is contacted with the side wall of the pressing cap to form a sealing surface, the first fluid channel is further closed, and the arrow-shaped main valve is closed. When the side circulation is switched, the arrow-shaped main valve is in an active closing state, the function of an internal blowout prevention tool can be achieved, and the drilling safety is improved.

In another exemplary embodiment, the continuous circulation drilling process uses the continuous circulation valve with an arrow-type main valve described above.

The process includes one or more of drilling, connecting a drill string, tripping, and tripping a drill string, wherein,

the continuous circulation valve having the arrow-type main valve is previously attached to a drill string,

during a drilling action, the continuous circulation valve with the arrow-type main valve is in a main circulation;

the drill string receiving operation comprises the following actions of sequentially switching the Nth drill string into a side circulation, connecting the (N + 1) th drill string, starting a main circulation of the (N + 1) th drill string and switching the drill string and the Nth drill string into a main circulation;

during a tripping action, the continuous circulation valve is in a main circulation state, and the continuous circulation valve is in an open state;

the drill string unloading operation comprises the following actions which are carried out in sequence, namely, taking out the Mth drill string and the continuous circulation valve part of the Mth drill string, switching the Mth drill string to a side circulation and closing a main circulation of the Mth drill string, unloading the Mth drill string, and switching the Mth drill string to the side circulation;

the switching to the side circulation action comprises the steps of sequentially opening a side valve and connecting a side valve input pipeline, controlling to open the side circulation and close the main circulation by using a control system, closing an arrow-shaped main valve and disassembling the arrow-shaped main valve input pipeline;

the switching to the main circulation action comprises the steps of sequentially opening the arrow-shaped main valve and connecting an input pipeline of the arrow-shaped main valve, using a control system to control the opening of the main circulation and the closing of the side circulation, closing the side valve and disassembling the input pipeline of the side valve;

the side valve input pipeline is connected with the side valve so as to inject a circulating medium into the central channel through the side valve;

the arrow-shaped main valve input pipeline is connected with the valve body and the central channel and can inject a circulating medium into the central channel.

The continuous circulation drilling process is described below in connection with fig. 5, and includes drilling, tripping, and tripping the drill string.

During a drilling action, the continuous circulation valve is in a main circulation state, the centering sleeve 60 is in contact with the support seat 40, and a circulation medium can be circulated through the first fluid passage 210 and the second fluid passage 220.

Before the operation of connecting the drill string, the continuous circulating valve with the arrow-shaped main valve is required to be connected on the drill string in advance.

When the drill string is connected for operation, the drill string which enters a well is set as the Nth drill string, the drill string which needs to be connected is the (N + 1) th drill string, and N is a natural number. The drill string tripping operation may include the following actions in sequence: switching the Nth drill string into side circulation, wherein circulation in the well is realized by injecting a circulation medium into the well through a side valve of a continuous circulation valve on the Nth drill string, and the circulation is not stopped, so that the pressure stability of the well is kept; connecting the (N + 1) th drill string; and (3) starting the main circulation of the (N + 1) th drill string and switching the Nth drill string into the main circulation, wherein the circulation in the well is realized by injecting a circulating medium into the well through the hollow channels of the continuous circulating valves on the Nth drill string and the (N + 1) th drill string, the circulation is not stopped, and the pressure stability of the well is kept.

The switching to the side cycle action includes sequentially opening the side valve and connecting the side valve input line, controlling to open the side cycle and close the main cycle, closing the arrow main valve and removing the arrow main valve input line using the control system. The switching to the main cycle comprises sequentially opening the arrow-type main valve and connecting the arrow-type main valve input line, using the control system to control the opening of the main cycle and the closing of the side cycle, closing the side valve and disassembling the side valve input line.

When the drill string is unloaded, the drill string which is discharged from the well is set as the Mth drill string, the drill string connected below the Mth drill string is the M-1 drill string, and M is more than or equal to 5. The drill string tripping operation comprises the following actions in sequence: removing the continuous circulation valve parts of the Mth drill string and the Mth-1 drill string, wherein circulation in the well is realized by injecting a circulation medium into the well hole through a hollow channel of the continuous circulation valve on the Mth drill string; switching the M-1 drill strings into side circulation and closing the main circulation of the M drill strings, wherein the circulation in the well is realized by injecting a circulation medium into a hollow channel of a continuous circulation valve through a side valve of the continuous circulation valve on the M-1 drill strings and further injecting the circulation medium into a well hole; unloading the Mth drill string; and switching the M-1 drill string to a main circulation, wherein the circulation in the well is realized by injecting a circulating medium into the well hole through the hollow channel of the continuous circulating valve on the M-1 drill string.

During a tripping action, the continuous circulation valve is in the main circulation.

In the whole process of drilling, connecting a drill string, tripping or disassembling the drill string, the circulation in the well is not stopped all the time, the pressure fluctuation when the circulation is stopped and started for connecting the drill string is eliminated, and the stability of the pressure of the well hole is favorably kept.

In another exemplary embodiment, as shown in fig. 5, the continuous circulation valve may include a valve body 10 having a hollow inside, an arrow-type main valve 20 disposed at the top of the valve body, and a side valve 30 disposed at the side of the valve body.

The side valve 30 is a drop-proof side valve and includes a valve seat 90, a pin cover 100, a first fixing pin 110, and a second fixing pin 120.

The pin cover 100 is fastened to the valve body 10 by a first fixing pin 110, and further, the first fixing pin 110 includes two pins.

The valve seat 90 is fastened to the pin cover 100 by a second fixing pin 120.

Further, since the pin cover 100 is not detached when used in the field, the gap between the first fixing pin 110 and the pin cover 100 is covered with an anaerobic adhesive and fixed again, and the gap between the pin cover 100 and the valve body 10 is covered with an anaerobic adhesive.

In another exemplary embodiment, the continuous circulation valve may include a valve body 10 having a hollow inside, an arrow-type main valve 20 disposed at the top of the valve body 10, and a side valve 30 disposed at the side of the valve body 10.

The side valve 30 is an observable side valve, and as shown in fig. 7, includes a valve plate 130, a valve plate fixing pin 140, a valve seat 90, a cover plate 150, a pressure relief member, a leakage observation member 170, and a leakage observation valve 180.

The valve seat 90 has a third through hole and a pressure relief hole 160, the third through hole can be communicated with the hollow inside of the valve body 10, and the pressure relief hole 160 is communicated with the third through hole.

Further, the valve seat 90 may further have an assembling and disassembling hole 240 for assembling and disassembling the valve seat 90. For example, the loading and unloading holes 240 may be 4 holes uniformly distributed on the valve seat 90.

The valve plate fixing pin 140 is disposed in the valve plate fixing pin hole to fix the valve plate 130. The third through hole can communicate with the inner hollow of the valve body 10 when the valve plate 130 is opened, and can seal the inner hollow of the valve body 10 when the valve plate 130 is closed.

The cover plate 150 has an axial stepped through hole, the stepped through hole is coaxial with the third through hole, and an axis of the cover plate 150 is perpendicular to an axis of the valve body 10.

The cover plate 150 is mounted by its outer wall to the inner wall of the valve seat 90 and forms an end-face seal with the valve seat 90.

The pressure relief member is disposed within the pressure relief hole 160.

Further, one end of the pressure relief piece is pressed against the outer wall of the cover plate 150, so as to further lock the cover plate 150.

Further, the cover plate 150 is connected with the valve seat 90 through internal and external threads, and the pressure relief hole 160 is communicated to the outside from an internal thread relief groove of the valve seat 90, so that the thread of the pressure relief piece is prevented from being damaged.

The leakage observation piece 170 is configured with a hollow channel, and a drain hole 190 communicated with the hollow channel is formed on the side wall of the leakage observation piece 170, further, the drain hole 190 may be 1-6 through holes circumferentially and uniformly distributed on the side wall of the leakage observation piece.

The leak observation member 170 is insertable into the hollow passage through a front end thereof and is movable in the hollow passage to a first position in which the leak observation valve 180 seals the drain hole 190 and a second position in which there is no contact between the leak observation valve 180 and the drain hole 190 so that the medium of the hollow passage can be discharged through the drain hole.

Further, the leakage observation member 170 has a fixing layer and an exhaust layer connected in sequence, the fixing layer is connected to the inner wall of the cover plate 150 and forms an end face seal, and the exhaust holes 190 are distributed on the exhaust layer.

Further, as shown in fig. 8, the leak inspection valve 180 has a first sealing part 280, a second sealing part 290, and a third sealing part 300, which are sequentially connected and have sequentially increasing diameters. When the leak observation valve 180 is moved to the first position in the hollow passage, the second sealing part 290 seals the drain hole 190; when the leak observation valve 180 is moved to the second position in the hollow passage, the drain hole 190 is aligned with the third sealing portion 300. Further, the third sealing portion 300 may be further configured with an inner hexagonal screw hole to facilitate the assembly and disassembly of the leakage observing valve 180.

Further, the continuous circulation valve may further comprise a first sealing member 200, wherein the first sealing member 200 (e.g., a rubber ring) is sleeved on the second sealing portion 290 to facilitate further sealing of the hollow channel of the leakage observation member 170.

Further, the continuous circulation valve further includes a second sealing member 230, and the second sealing member 230 (e.g., a rubber ring) is sleeved on the connection position of the end face of the cover plate 150 and the valve seat 90, so as to further seal the side valve 30.

The leak observation valve 180 is gradually moved from the first position to the second position when the continuous circulation valve is switched from the main circulation state to the side circulation state. If the side valve 30 leaks, gas or other media are discharged from the discharge hole 190, and a worker can directly observe whether the side valve 30 leaks, so that the pressure injection injury accident which may occur when the pressure relief piece is directly disassembled is avoided. If the side valve 30 does not leak, the pressure relief member, the cover plate 150, etc. are removed and the side circulation line is connected.

In another exemplary embodiment, the continuous circulation valve side includes a valve seat 90, a cover plate 150, a pressure relief member, a leak sight 170, and a leak sight valve 180.

The valve seat 90 has a third through hole that can communicate with the inside hollow of the valve body 10 and a pressure relief hole 160 that communicates with the third through hole.

The valve plate 130 is fixed to the valve body 10 by a valve plate fixing pin 140.

The cover plate 150 has an axial step-shaped through hole, the cover plate 150 is mounted on the inner wall of the valve seat 90 through the outer wall thereof and forms an end face seal with the valve seat 90, and the step-shaped through hole is coaxial with the third through hole.

The pressure relief member is disposed within the pressure relief hole 160.

A hollow passage is formed on the leakage observing member 170, and a drain hole 190 communicating with the hollow passage is formed on a side wall of the leakage observing member 170. Further, the drain hole 190 is circumferentially arranged on the leakage observing member 17. Further, the number of the drain holes 190 may be 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12.

The leak observation member 170 is insertable into the hollow passage through a front end thereof and is movable in the hollow passage to a first position in which the leak observation valve 180 seals the drain hole 190 and a second position in which there is no contact between the leak observation valve 180 and the drain hole 190 so that the medium of the hollow passage can be discharged through the drain hole 190.

Further, the leakage observing valve 180 has a first sealing portion, a second sealing portion and a third sealing portion which are connected in sequence and have diameters which increase in sequence, wherein when the leakage observing valve 180 moves to a first position in the hollow passage, the second sealing portion 290 seals the drain hole 190, and when the leakage observing valve 180 moves to a second position in the hollow passage, the first contact cannot seal the drain hole 190, and thus the medium of the hollow passage can be discharged through the drain hole 190.

In summary, the beneficial effects of the safe and fast operation mechanism for valve type continuous circulation drilling can include:

1) the quick connection device has the advantages that the quick connection of the side circulation pipeline and the continuous circulation valve can be realized through the structural arrangement of the quick connection device, and meanwhile, the arrangement of the continuous circulation valve is matched, so that the connection efficiency, reliability and safety are improved.

2) The integrated control device can preliminarily realize automation and mechanization, and greatly reduce the labor intensity of operators; but also effectively solves the problems of large occupied area, scattered and inconvenient assembly, disassembly, installation and management of the continuous circulation drilling system.

3) The operating mechanism can reduce the labor intensity of valve type continuous circulation drilling operation personnel, preliminarily realizes automation and mechanization, reduces the injury risk of personnel operating on the drilling floor, ensures the safety of the operation personnel, and comprehensively improves the high efficiency, reliability and safety in the continuous circulation drilling operation process.

4) The active sealing of the main valve can be realized, and the operation safety of the continuous circulating valve is greatly improved.

5) The risk that the side valve falls into the well due to vibration in the drilling process can be avoided.

6) It is possible to observe whether the side valve leaks before the side valve cover plate is opened.

7) The occurrence of accidents of hurting people by high-pressure gas which may leak from the side valve when connecting the side circulation line can be avoided.

Although the present invention has been described above in connection with the exemplary embodiments and the accompanying drawings, it will be apparent to those of ordinary skill in the art that various modifications may be made to the above-described embodiments without departing from the spirit and scope of the claims.

Claims

1. A continuous circulation drilling system is characterized by comprising a continuous circulation valve and a safe and quick operation mechanism for valve type continuous circulation drilling, wherein a side outlet is formed on the side wall of the continuous circulation valve;

the operating mechanism includes a quick-connect device, the quick-connect device includes:

a clamping unit for clamping the continuous circulation valve;

one end of the connector is connected with the side outlet, and the other end of the connector is connected to a side circulation pipeline; and

and the locking unit drives the connecting head to be close to or far away from the side outlet under the condition that the continuous circulating valve is clamped by the clamping unit, so that the connecting head and the continuous circulating valve are locked or unlocked.

2. The continuous circulation drilling system of claim 1, wherein the gripping unit comprises:

the inner cavity of the shell is hollow, an opening is formed in one side of the shell, an arc-shaped opening groove is formed in the one side of the shell, and the arc-shaped opening groove corresponds to the surface of one side of the continuous circulating valve; and

the back plate is arranged at the opening in an openable and closable manner, a curved surface corresponding to the other side surface of the continuous circulating valve is formed on the back plate, the one side surface of the continuous circulating valve is opposite to the other side surface of the continuous circulating valve, and a clamping opening for clamping the continuous circulating valve is formed between the curved surface and the arc-shaped opening groove in a state that the back plate closes the opening.

3. The continuous circulation drilling system of claim 2, wherein the locking unit is a linear telescopic driving mechanism disposed in the housing, one end of the linear telescopic driving mechanism is connected to the back plate, the other end of the linear telescopic driving mechanism is connected to the other end of the connector, and the linear telescopic driving mechanism drives the one end of the connector and the side outlet to be coupled with or separated from each other.

4. The continuous circulation drilling system of claim 3, wherein the linear extension driving mechanism is a pneumatic hydraulic device, a hydraulic device or an electro-hydraulic device, a cylinder body of the linear extension driving mechanism is connected with the back plate, an end of a piston rod of the linear extension driving mechanism is connected to the connector through a fixing plate, and the fixing plate extends radially outwards from the other end of the connector.

5. The continuous circulation drilling system of claim 2, wherein one side of the back plate is connected to a side of the housing forming the opening by a first connector;

the other side of the back plate, which is opposite to the one side, is connected to the other side of the shell, which is opposite to the one side, through a second connecting piece;

the first connecting member includes:

a first back plate pin hole formed at one end of the back plate; and

the first pin extends in the hole axis direction of the first back plate pin hole and can be matched with the first back plate pin hole; wherein the content of the first and second substances,

the locking unit is provided with a first chain fixed pin hole, and the first chain fixed pin hole and the first back plate pin hole are matched with a first pin to connect one end of the back plate to the locking unit;

the second connector includes:

a second back plate pin hole formed at the other end of the back plate; and

the second pin extends in the hole axis direction of the second back plate pin hole and can be matched with the second back plate pin hole; wherein the content of the first and second substances,

the locking unit is provided with a second chain fixed pin hole, and the second chain fixed pin hole and the second backboard pin hole are matched with a second pin to clamp or release the other end of the backboard and connect the locking unit.

6. The continuous circulation drilling system of claim 2, wherein a control button is provided on an outer wall of the housing for controlling the locking unit.

7. The continuous circulation drilling system of claim 1, wherein the side outlet is provided with a seal groove on the inside for mounting a seal ring.

8. The continuous circulation drilling system of claim 1, wherein the connection head is supported on one end of the continuous circulation valve and is provided with a backstop ring, the inner side of the side outlet is provided with backstop teeth, and the backstop ring and the backstop teeth are matched to limit free movement of the connection head.

9. The continuous circulation drilling system of claim 1, wherein the connection head rests against one end of the continuous circulation valve in a truncated cone design.

10. The continuous circulation drilling system of claim 1, wherein one end of the continuous circulation valve is adapted to be connected to a main circulation line, the work implement further comprising a flow path switching control device comprising:

the manifold is skid-mounted and used for switching the connection of the continuous circulating valve and a main circulating pipeline or a side circulating pipeline; and

and the control operation chamber monitors and receives pressure information of the main circulation pipeline and the side circulation pipeline to control pipe manifold skid-mounting so as to realize switching of the main circulation pipeline and the side circulation pipeline.

11. The continuous circulation drilling system of claim 1, wherein the continuous circulation valve comprises an internally hollow valve body and an arrow-type main valve disposed within an upper end of the valve body,

the arrow-shaped main valve is arranged coaxially with the valve body and comprises a supporting seat, a sealing arrow, a righting sleeve, an elastic part and a pressing cap,

the supporting seat is arranged in the valve body through the side wall of the supporting seat, a first through hole and a first fluid channel are formed on the supporting seat,

the pressure cap is arranged in the valve body, a second through hole and a second fluid channel are formed on the pressure cap, the second through hole and the first through hole are coaxially arranged,

the sealing arrow comprises a sealing arrow body, a sealing part and a righting sleeve mounting part which are sequentially connected, the lower end of the sealing arrow can be inserted into the first through hole, the upper end of the sealing arrow can be inserted into the second through hole, the sealing part protrudes outwards from the sealing arrow body, and the outer edge of the sealing part can be in contact with the side wall of the pressure cap to form a sealing surface,

the righting sleeve mounting part is positioned on the lower side of the sealing part and protrudes outwards from the sealing arrow body, the outer diameter of the righting sleeve mounting part is equal to or slightly smaller than the inner diameter of the righting sleeve,

the upper end of the centralizing sleeve is sleeved on the centralizing sleeve mounting part, the axial length of the centralizing sleeve is less than the distance between the lower end surface of the side wall of the pressing cap and the upper end surface of the supporting seat,

the elastic piece suit is in between sealed arrow body and the cover of righting, the lower extreme of elastic piece and the up end contact of supporting seat, the upper end of elastic piece and the lower extreme contact of the cover installation department of righting, and the elastic piece is in compression state.

12. The continuous circulation drilling system of claim 11, wherein the continuous circulation valve further comprises a side valve disposed on a sidewall of a lower end of the valve body, the side valve being a drop-resistant side valve, the side valve comprising a valve seat, a pin cover, a first retaining pin, and a second retaining pin,

the pin cover is fastened to the valve body by a first fixing pin,

the valve seat is fastened to the pin cover by a second fastening pin.

13. The continuous circulation drilling system of claim 12, wherein a gap between the first retaining pin and the pin cover is covered with anaerobic glue, and a gap between the pin cover and the valve body is covered with anaerobic glue.

14. The continuous circulation drilling system of claim 11, wherein the continuous circulation valve further comprises a side valve disposed on a sidewall of the valve body, the side valve being an observable side valve comprising a valve plate, a valve plate retainer pin, a valve seat, a cover plate, a pressure relief member, a leak sight and a leak sight valve,

the valve seat is provided with a third through hole and a pressure relief hole, the third through hole can be communicated with the inside of the valve body in a hollow way, the pressure relief hole is communicated with the third through hole,

the valve plate is fixed on the valve body through a valve plate fixing pin,

the cover plate is provided with an axial step-shaped through hole, the cover plate is arranged on the inner wall of the valve seat through the outer wall of the cover plate and forms end face seal with the valve seat, the step-shaped through hole is coaxial with the third through hole,

the pressure relief piece is arranged in the pressure relief hole,

a hollow passage is formed on the leakage observing member, and a drain hole communicated with the hollow passage is formed on the side wall of the leakage observing member,

a leak observation member is insertable into the hollow passage through a front end thereof and is movable in the hollow passage to a first position in which the leak observation valve seals the drain hole and a second position in which there is no contact between the leak observation valve and the drain hole so that the medium of the hollow passage can be discharged through the drain hole.

15. The continuous circulation drilling system of claim 14, wherein the cover plate is threadably coupled to the valve seat, the pressure relief hole communicates from an internally threaded relief recess of the valve seat to the exterior, and the pressure relief member bears against an outer wall of the cover plate.

16. The continuous circulation drilling system of claim 14, wherein the leak sight having a fixed zone and an exhaust zone connected in series, the leak sight valve having a first seal, a second seal and a third seal connected in series and increasing in diameter in series, wherein,

the fixed layer is arranged on the inner wall of the cover plate and forms end face seal with the cover plate,

the drain holes are uniformly distributed on the exhaust layer in the circumferential direction,

a second sealing portion sealing the drain hole when the leak inspection valve is moved to a first position in the hollow passage,

the drain hole is aligned with the third seal when the leak observation valve is moved to a second position in the hollow passage.

17. The continuous circulation drilling system of claim 16, further comprising a first seal that is fitted over the second seal.

18. A continuous circulation drilling process comprising one or more of drilling, tripping and tripping, wherein rapid connection of a side circulation line to a continuous circulation valve is achieved using a continuous circulation drilling system as claimed in any one of claims 1 to 17.

19. The continuous circulation drilling process of claim 18, wherein the process comprises:

pre-connecting said continuous circulation valve with an arrow-type main valve on a drill string,

during a tripping action, the continuous circulation valve is in a main circulation;