CN109594942B - Tripping method of tripping system for pressure-controllable continuous circulation drilling fluid - Google Patents
Tripping method of tripping system for pressure-controllable continuous circulation drilling fluid Download PDFInfo
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- CN109594942B CN109594942B CN201910085488.5A CN201910085488A CN109594942B CN 109594942 B CN109594942 B CN 109594942B CN 201910085488 A CN201910085488 A CN 201910085488A CN 109594942 B CN109594942 B CN 109594942B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/12—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using drilling pipes with plural fluid passages, e.g. closed circulation systems
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/10—Valve arrangements in drilling-fluid circulation systems
Abstract
The invention provides a tripping system of controllable-pressure continuous circulation drilling fluid and a tripping method thereof, comprising a drill rod, an upper circulation chamber device, a lower circulation chamber device and an intermediate gate valve assembly; the upper circulation chamber device comprises an upper circulation chamber, a drilling fluid inlet and outlet chamber component, a pressure valve control component, an upper rotary rubber core component and a needle type back pressure control valve component which are arranged on the upper circulation chamber; the lower circulation chamber device comprises a lower circulation chamber, a drilling fluid inlet and outlet chamber component, a pressure valve control component and a lower rotary rubber core slip component, wherein the drilling fluid inlet and outlet chamber component, the pressure valve control component and the lower rotary rubber core slip component are arranged on the lower circulation chamber. The pressure-controllable circulating drilling fluid tripping system provided by the invention can continuously circulate the drilling fluid in a tripping state, so that the whole vertical pipe keeps the drilling fluid circulation in a state of connecting a single pipe or a vertical column, and the pressure control of a wellhead can be performed in the whole drilling fluid circulation state.
Description
Technical Field
The invention relates to the technical field of drilling, drilling fluid and well control, in particular to a tripping method of a tripping system of a pressure-controllable continuous circulation drilling fluid.
Background
With the development of narrow pressure windows of unconventional shale gas and conventional carbonate rock oil gas, the horizontal well drilling process is widely deployed, oil-based mud and water-based mud are widely applied and leak and overflow in the tripping process, particularly, a great amount of returning mud in the tripping process in an ocean drilling platform is easily leaked into the sea, so that the safety and environmental protection risks of field construction units are increased, and the equipment requirements of a closed tripping mode are increasingly increased.
The well drilling fluid can be circulated continuously, pressure fluctuation caused by the process that the well drilling fluid stops circulating and starts circulating can be eliminated, the fluctuation of the liquid column pressure of a well bore can be effectively reduced, the stability of the well wall is maintained, the bottom hole pressure is accurately controlled to be close to or slightly larger than the formation pore pressure, the well drilling fluid can be circulated and the whole single connection process can be completed in the well drilling process by the complete trapping system, and the circulation pressure (stress pressure) in the well bore changes due to the fact that the single connection has to be stopped, overflow or leakage can be generated in a stratum with a narrow pressure window, and the device can effectively keep the liquid circulation in the whole process as continuously as possible to reduce the change of the well bore pressure.
The pressure compensation can be carried out in the circulating cavity in the stratum with the narrow pressure window, so that back pressure is generated at the wellhead, the back pressure of 3-7Mpa is increased on the wellhead by the drilling fluid column in the whole process, and then uninterrupted pressure control drilling is carried out under the narrow pressure window, so that non-drilling aging under well control factors under the condition of gas invasion or micro leakage is reduced, and oil and gas development is effectively carried out.
Currently, the drilling fluid of Varco company is continuously circulated. A continuous circulation drilling system (Continuous Circulation System, CCS system for short) can maintain continuous circulation of drilling fluid during connection and tripping, and the CCS system comprises a host, a top drive connector, a shunt device, a hydraulic station and a control system. The main machine is the core and the actuating mechanism of the CCS system, and mainly comprises a three-ram blowout preventer (the middle part is fully sealed, and the upper and lower ram plates) a forced tripping device, a power slip, a base and a lifting system. A closed chamber is formed when the upper shutter and the lower shutter are closed at the same time. The forced tripping device is arranged at the top of the main machine and is provided with a hydraulic piston for providing vertical restraining force to help the drill rod to enter and exit the closed cavity of the main machine, so that the drill rod cannot move the position of the drill rod in the cavity in a fixed state in a pressure-bearing state of the cavity, and the trap pressure cannot be effectively generated in a trap state at a wellhead. The main machine is also provided with a device for clamping the drill rod, the device is arranged on the horizontal gear, the hydraulic piston provides the initial torque required by the tripping operation through the gear, and the damage of the drill rod is easily caused by the process method, so that the invisible risk is more easily caused. The devices are mainly matched with top drives and the like for combined use, the renting cost is high, the operation is complex, the CCS system is composed of three groups of blowout preventers and is divided into two cavities by a totally-enclosed flashboard, the two cavities are single in function and cannot carry out pressure compensation and pressure control operation, and the power slips and the forced lifting device are complex in structure and short in service life.
Disclosure of Invention
The invention aims to provide a tripping method of a tripping system of a controllable-pressure continuous circulation drilling fluid, which aims to solve the defects in the prior art.
The invention adopts the technical scheme that: the pressure-controllable continuous circulation drilling fluid tripping system is characterized by comprising a drill rod, an upper circulation chamber device, a lower circulation chamber device and an intermediate gate valve assembly; the upper circulation chamber device comprises an upper circulation chamber, a drilling fluid inlet and outlet chamber component, a pressure valve control component, an upper rotary rubber core component and a needle type back pressure control valve component which are arranged on the upper circulation chamber; the lower circulation chamber device comprises a lower circulation chamber, a drilling fluid inlet and outlet chamber component, a pressure valve control component and a lower rotary rubber core slip component, wherein the drilling fluid inlet and outlet chamber component, the pressure valve control component and the lower rotary rubber core slip component are arranged on the lower circulation chamber.
According to the invention, the middle gate valve assembly comprises an annular middle gate valve core for wrapping a fixed drill rod and a shearing middle gate core for separating an upper cavity and a lower cavity.
According to the pressure-controllable continuous circulation drilling fluid tripping system, the drilling fluid inlet and outlet chamber component comprises a fluid inlet pipe arranged at the upper part of the upper circulation chamber or the lower circulation chamber respectively, and the drilling fluid inlet and outlet chamber component also comprises a fluid outlet pipe arranged at the lower part of the upper circulation chamber or the lower circulation chamber respectively; the liquid inlet pipe is provided with a liquid inlet control valve for controlling a switch and monitoring flow; the liquid outlet pipe is provided with a liquid outlet control valve for controlling the switch and monitoring the flow.
According to the pressure-controllable continuous circulation drilling fluid tripping system, the pressure valve control assembly comprises pressure valve access channels respectively arranged on the upper circulation chamber or the lower circulation chamber, and needle type pressure control valves and pressure gauges are arranged on the pressure valve access channels.
According to the pressure-controllable continuous circulation drilling fluid tripping system, the upper rotary rubber core assembly is positioned at the upper end of the upper circulation chamber, the lower rotary rubber core slip assembly is positioned at the lower end of the lower circulation chamber, and the middle gate valve assembly is positioned between the upper circulation chamber and the lower circulation chamber.
According to the pressure-controllable continuous circulation drilling fluid tripping system, the upper rotary rubber core assembly comprises a rotary control head for sealing the upper circulation chamber and a rotary rubber core for wrapping a drill rod.
According to the pressure-controllable continuous circulation drilling fluid tripping system, the lower rotary rubber core slip assembly comprises a rotary control head for sealing a lower circulation cavity and a rotary rubber core for wrapping a drill rod; the lower rotary rubber core slip assembly further comprises a mechanical slip mechanism positioned at the lower part of the rotary control head, the rotary control head is combined with the mechanical slip mechanism at the lower part of the rotary control head, when a drill rod needs to be fixed, the lower mechanical slip is used for fixing a lower drilling tool assembly, and the rotary rubber core is used for bearing a closed lower circulation cavity.
According to the pressure-controllable continuous circulation drilling fluid tripping system, the needle type back pressure control valve assembly comprises a back pressure pipe communicated with the upper circulation chamber; and the back pressure pipe is provided with an upper circulation chamber back pressure compensation valve cock and an upper circulation chamber needle type back pressure compensation valve.
According to the pressure-controllable continuous circulation drilling fluid tripping system, the lower circulation chamber device further comprises a lower circulation chamber standby inlet and outlet pipe communicated with the middle of the lower circulation chamber, and a control valve is arranged on the lower circulation chamber standby inlet and outlet pipe.
According to the pressure-controllable continuous circulation drilling fluid tripping system, the liquid inlet pipe is connected with a slurry pump or other liquid inlet pumps, and the liquid outlet pipe is connected with a vibrating screen or a circulation tank and the like.
The tripping method of the tripping system for the drilling fluid with the controllable pressure continuous circulation is characterized by comprising the following steps:
s1: connecting the drill rod with a drilling tool;
s2: opening the middle gate valve assembly, the upper rotary rubber core assembly and the lower rotary rubber core slip assembly, and then lifting the drill rod until the drilling tool joint hoop stretches into the lower circulation cavity;
s3: closing the upper rotary rubber core assembly and the lower rotary rubber core slip assembly, wrapping a drill rod by the upper rotary rubber core assembly, wrapping a drilling tool by the lower rotary rubber core slip assembly, forming a sealing chamber by the upper circulation chamber and the lower circulation chamber, filling drilling fluid into the upper circulation chamber, discharging liquid from the lower circulation chamber, and keeping the pressure of the liquid consistent with the pressure of a vertical pipe; the upper and lower chambers form a uniform pressure system, and the liquid circulation is carried out on the lower circulation chamber and the liquid inlet and outlet of the upper circulation chamber.
S4: reversing the drilling tool, which can be performed by using a hydraulic clamp or a top drive system;
s5: the liquid in the upper and lower circulating chambers continuously circulates, and the drilling tool plays a role in pressing a drill rod through the upper rotary rubber core component after the reverse buckling is completed;
s6: closing the middle flashboard valve assembly to enable the upper circulation chamber and the lower circulation chamber to be independent, stopping circulation of drilling fluid of the upper circulation chamber, and continuing circulation of drilling fluid of the lower circulation chamber;
s7: opening an upper rotary rubber core assembly, and lifting a drill rod to a wellhead through a control head to perform drill rod replacement operation after the pressure relief of an upper circulating cavity is finished;
s8: after the drill rod is replaced, the drill rod enters an upper circulation cavity from an upper rotary rubber core assembly, the upper rotary rubber core assembly is closed, the upper circulation cavity becomes a sealing cavity, drilling fluid of the upper circulation cavity starts to circulate, and the circulation pressure and the discharge capacity of the upper circulation cavity are kept consistent with those of the lower circulation cavity;
s9: when the upper circulation chamber and the lower circulation chamber are kept consistent, the middle gate valve assembly is opened, the upper circulation chamber and the lower circulation chamber form a sealing chamber for circulating drilling fluid, then the drill rod is drilled down into the lower circulation chamber to be butted with a drilling tool, and the hydraulic tongs or the top drive of the drill platform is buckled up and the tripping and butting are completed.
The beneficial effects of the invention are as follows:
(1) The pressure-controllable circulating drilling fluid tripping system provided by the invention can continuously circulate the drilling fluid in a tripping state, so that the whole vertical pipe keeps the drilling fluid circulating in a state of connecting a single pipe or a vertical column.
(2) The vertical independent circulating drilling fluid chambers provided by the invention can be used for independently circulating drilling fluid, so that well control events caused by incapacity of working of one chamber can be avoided.
(3) The upper continuous circulation chamber provided by the invention can carry out back pressure compensation in the drilling or other technological processes in the state of 3-7Mpa of pressure bearing of the whole chamber, and can maintain wellhead pressure control of casing pressure in various engineering states of drilling engineering.
(4) The lower continuous circulation chamber provided by the invention is provided with the pressure valve control assembly, so that wellhead pressure fluctuation can be monitored in real time and back pressure compensation can be performed in the single connection process and the drilling process.
(5) The pressure-controllable circulating drilling fluid tripping system provided by the invention can be suitable for the column-connected tripping of drilling machine equipment with top drive, and can also be used for the single joint operation mode of a water tap type joint of a conventional drilling team (trial repair team) in trial, so that the use cost of high-value equipment is reduced.
Drawings
FIG. 1 is a schematic diagram of a system for tripping a drilling fluid in a continuous circulation mode with controllable pressure according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of a drill pipe connection with a drilling tool;
FIG. 3 is a schematic illustration of a lifting drill pipe;
FIG. 4 is a schematic illustration of the upper rotary core assembly and the lower rotary core slip assembly after closing;
FIG. 5 is a schematic view of the drill after back-off;
FIG. 6 is a schematic illustration of a drill pipe under pressure tripping;
FIG. 7 is a schematic view of the intermediate gate valve assembly after closing;
FIG. 8 is a schematic illustration of a drill rod change;
FIG. 9 is a schematic view of the drill rod entering the upper circulation chamber;
fig. 10 is a schematic view of the drill pipe interfacing with a drilling tool.
In the figure, a 1-upper rotary rubber core component, a 101-rotary rubber core, a 2-drill rod (oil pipe), a liquid inlet pipe of a 4-upper circulating chamber, a liquid outlet pipe of a 5-upper circulating chamber, a liquid inlet pipe of a 6-lower circulating chamber, a liquid outlet pipe of a 7-lower circulating chamber, an 8-lower circulating chamber, a 9-upper circulating chamber, a 10-lower rotary rubber core slip component, a 11-lower circulating chamber standby liquid inlet and outlet pipe, a 12-lower circulating chamber pressure valve control component, a 13-upper circulating chamber back pressure compensation valve cock, a 14-upper circulating chamber needle back pressure compensation valve, a 15-upper circulating chamber pressure valve control component, a 16-annular middle flashboard valve core, a 17-shearing middle flashboard core, an 18-liquid inlet control valve, a 19-liquid outlet control valve and a middle flashboard valve component 21 and a drilling tool 22.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus they should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; of course, it may be mechanically or electrically connected; in addition, the connection may be direct, indirect via an intermediate medium, or communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Example 1
As shown in fig. 1, the invention provides a pressure-controllable continuous circulation drilling fluid tripping system, which comprises a drill rod 2, an upper circulation chamber device, a lower circulation chamber device and an intermediate gate valve assembly 21; the upper circulation chamber device comprises an upper circulation chamber 9, an in-out drilling fluid chamber component, an upper circulation chamber pressure valve control component 15, an upper rotary rubber core component 1 and a needle back pressure control valve component which are arranged on the upper circulation chamber 9; the lower circulation chamber device comprises a lower circulation chamber 8, a drilling fluid inlet and outlet chamber assembly, a lower circulation chamber pressure valve control assembly 12 and a lower rotary rubber core slip assembly 10 which are arranged on the lower circulation chamber 8.
The controllable pressure continuous circulation drilling fluid tripping system is arranged below a drilling floor surface, the upper part of a wellhead blowout preventer is connected with a flange plate at the upper part of the blowout preventer stack, and the lower part of the wellhead blowout preventer is sequentially divided into a lower rotary rubber core slip assembly 10, a lower circulation chamber 8, an intermediate gate valve assembly, an upper circulation chamber 9 and an upper rotary rubber core assembly 1 from bottom to top.
The in-out drilling fluid chamber component is an upper and lower circulating chamber drilling fluid supplementing and pressurizing system, and the upper and lower circulating chambers are supplied to the upper and lower chambers through a slurry pump to supplement and circulate.
The pressure test is divided according to the working purposes of the upper circulation chamber and the lower circulation chamber in different time periods, and the pressures of the upper circulation chamber 9 and the lower circulation chamber 8 are respectively controlled.
When the drilling operation device is used, in the process of carrying out single joint operation in each stage of the drilling operation, the upper rotary rubber core assembly 1 is firstly closed, the upper circulation chamber and the lower chamber are sealed, then the lower rotary rubber core slip assembly 10 is closed, after the pressure of the liquid inlet pipes of the upper circulation chamber and the lower circulation chamber is consistent with the pressure of the vertical pipe through the slurry pump, the drill rod 2 (oil pipe) is reversely buckled and discharged, then the middle flashboard valve assembly is closed, the lower circulation chamber is sealed, the circulating drilling fluid is circulated, finally the single joint is accessed, the upper circulation chamber is accessed, after the pressure of the upper circulation chamber is consistent with the pressure of the lower circulation chamber, the middle flashboard valve assembly is opened, then the single joint is carried out by buckling, the liquid is discharged from the chambers, and the lower operation is continued.
The system for tripping drilling fluid with controllable pressure continuous circulation according to the invention comprises an annular middle flashboard valve core 16 for wrapping a fixed drill rod 2 and a shearing middle flashboard core 17 for separating an upper chamber and a lower chamber.
The upper and lower circulation chambers are kept in an open state in the drilling process, the upper and lower chambers meet the sealing and liquid pressure exchange process of drilling fluid in the tripping process, and the upper and lower circulation chambers consist of an upper rotary rubber core assembly 1, a middle gate valve assembly and a lower rotary rubber core slip assembly 10.
According to the pressure-controllable continuous circulation drilling fluid tripping system, the drilling fluid inlet and outlet chamber component comprises a fluid inlet pipe arranged at the upper part of the upper circulation chamber 9 or the lower circulation chamber 8 respectively, and a fluid outlet pipe arranged at the lower part of the upper circulation chamber 9 or the lower circulation chamber 8 respectively; the liquid inlet pipe is provided with a liquid inlet control valve 18 for controlling a switch and monitoring flow; the liquid outlet pipe is provided with a liquid outlet control valve 19 for controlling a switch and monitoring flow; and pressure gauges are arranged on the liquid inlet pipe and the liquid outlet pipe.
The explanation for the access to the drilling fluid chamber assembly is: the liquid inlet pipe arranged at the upper part of the upper circulating chamber 9 is the liquid inlet pipe 4 of the upper circulating chamber, the liquid outlet pipe arranged at the lower part of the upper circulating chamber 9 is the liquid outlet pipe 5 of the upper circulating chamber, the liquid inlet pipe arranged at the upper part of the lower circulating chamber 8 is the liquid inlet pipe 6 of the lower circulating chamber, and the liquid outlet pipe arranged at the lower part of the lower circulating chamber 8 is the liquid outlet pipe 7 of the lower circulating chamber.
According to the pressure-controllable continuous circulation drilling fluid tripping system, the upper circulation chamber pressure valve control assembly 15 and the lower circulation chamber pressure valve control assembly 12 respectively comprise pressure valve inlet and outlet channels which are correspondingly arranged on the upper circulation chamber 9 or the lower circulation chamber 8, and needle type pressure control valves and pressure gauges are arranged on the pressure valve inlet and outlet channels; the needle pressure control valve is a throttle valve.
According to the pressure-controllable continuous circulation drilling fluid tripping system, the upper rotary rubber core assembly 1 is positioned at the upper end of the upper circulation chamber 9, the lower rotary rubber core slip assembly 10 is positioned at the lower end of the lower circulation chamber 8, and the middle gate valve assembly is positioned between the upper circulation chamber 9 and the lower circulation chamber 8.
According to the pressure-controllable continuous circulation drilling fluid tripping system, the upper rotary rubber core assembly 1 comprises a rotary control head for sealing the upper circulation chamber 9 and a rotary rubber core 101 for wrapping the drill rod 2, the rotary rubber core 101 is arranged on the rotary control head, and the drill rod can enter and exit the upper circulation chamber 9 under the pressure state in the drilling process.
The lower rotary rubber core slip assembly 10 comprises a rotary control head for sealing the lower circulation chamber 8 and a rotary rubber core 101 for wrapping the drill rod 2; the lower rotary rubber core slip assembly 10 further comprises a mechanical slip mechanism positioned at the lower part of a rotary control head, the rotary control head is combined with the mechanical slip mechanism at the lower part of the rotary control head, when a drill rod needs to be fixed, the lower mechanical slip is used for fixing a lower drilling tool assembly, the rotary rubber core 101 is used for bearing and sealing the lower circulation chamber 8, and the mechanical slip mechanism is used for supporting and sealing the space between the drill rod 2 (oil pipe) and the upper and lower cavities.
According to the pressure-controllable continuous circulation drilling fluid tripping system, the needle type back pressure control valve assembly comprises a back pressure pipe communicated with the upper circulation chamber 9; the back pressure pipe is provided with an upper circulation chamber back pressure compensating valve cock 13 and an upper circulation chamber needle back pressure compensating valve 14.
The pressure of the cavity is regulated according to the change of the sealing pressure of the cavity, the regulating range is manually controlled according to the opening mode of the needle type back pressure compensating valve 14 of the upper circulation cavity, and the back pressure regulating range is controlled to be 3-7Mpa.
The needle type back pressure control valve assembly consists of an upper circulation chamber back pressure compensation valve cock 13 and an upper circulation chamber needle type back pressure compensation valve 14, the internal pressure of the upper circulation chamber 9 is controlled through a 1502 buckle and an external pressure pump, the manual throttling mode of pressure relief of the upper circulation chamber needle type back pressure compensation valve 14 is used for carrying out compensatory pressure control operation to keep wellhead back pressure to generate and restore formation pressure balance, and the P formation fluid pressure=P hydrostatic column pressure+P circulation pressure+P wellhead back pressure.
According to the pressure-controllable continuous circulation drilling fluid tripping system, the lower circulation chamber device further comprises a lower circulation chamber standby inlet and outlet pipe 11 communicated with the middle part of the lower circulation chamber 8, and a control valve is arranged on the lower circulation chamber standby inlet and outlet pipe 11.
According to the pressure-controllable continuous circulation drilling fluid tripping system, the liquid inlet pipe is connected with a slurry pump or other liquid inlet pumps, and the operations of pressure supplementing circulation, pressure relief and the like are performed through the slurry pump. The liquid outlet pipe is connected with a vibrating screen or a circulation tank and the like. When the system is used, the drill rod 2 (oil pipe) normally passes through the system, and the upper rotary rubber core component 1 at the upper end of the upper circulation chamber 9 wraps the rubber core of the drill rod 2 and presses the drill rod to drill; at this time, the upper and lower circulating chambers are divided into upper and lower sealing circulating chambers by a middle gate valve assembly consisting of an annular middle gate valve core 16 and a shearing middle gate valve core 17, and the upper circulating chamber circulating drilling fluid is formed by the liquid inlet of a liquid inlet pipe 4 of the upper circulating chamber and the liquid outlet of a liquid outlet pipe 5 of the upper circulating chamber; determining the working state of an intermediate gate valve assembly consisting of an annular intermediate gate valve core 16 and a shearing intermediate gate valve core 17 according to the pressure detection condition and the process requirement; at this time, the drill rod 2 (oil pipe) passes through the lower circulation chamber, the system forms a sealing cavity by the middle gate valve assembly and the lower rotary rubber core slip assembly 10 according to the process requirement, and the drilling fluid circulation is carried out by the liquid inlet pipe 6 of the lower circulation chamber and the liquid outlet pipe 7 of the lower circulation chamber, so that the operation flow of connecting a single joint or a vertical column is carried out.
In one example of the invention, in the normal process of passing through the system, the drill rod 2 (oil pipe) is in a sealed state, the upper circulation chamber 9 and the lower circulation chamber 8 are kept in a fully opened state, the annular middle gate valve core 16 and the middle gate valve system of the shearing middle gate valve core 17 are in a closed-loop pressure-bearing filling and casing pressure communication state, so that a sealed-loop drilling fluid circulation system is formed, at the moment, the pressure valve control components of the upper circulation chamber and the lower circulation chamber detect the pressure in the chamber, the upper circulation chamber back pressure compensation valve cock 13 is fully opened and connected with an external pump to form a passage state, the back pressure is controlled by the upper circulation chamber needle back pressure compensation valve 14, and the upper circulation chamber 9 is subjected to pressure compensation or pressure relief.
The tripping method of the tripping system for the drilling fluid with the controllable pressure continuous circulation is characterized by comprising the following steps:
1. the drill rod 2 is connected to a drilling tool 22 (as shown in fig. 2).
2. The intermediate gate valve assembly 21, upper rotary core assembly 1 and lower rotary core slip assembly 10 are opened and the drill pipe 2 is then lifted up until the collar of the drill tool 22 extends into the lower circulation chamber 8 (as shown in figure 3).
3. Closing the upper rotary rubber core assembly 1 and the lower rotary rubber core slip assembly 10, wrapping the drill rod 2 by the upper rotary rubber core assembly 1, wrapping the drilling tool 22 by the lower rotary rubber core slip assembly 10, forming a sealing chamber by the upper circulation chamber 9 and the lower circulation chamber 8, filling the upper circulation chamber 9 with drilling fluid, discharging the lower circulation chamber 8, forming a uniform pressure system by the upper and lower chambers, and circulating the liquid in and out ports of the lower circulation chamber 8 and the upper circulation chamber 9 (as shown in fig. 4).
4. Reversing the drill 22 may be performed using a hydraulic tong or top drive system (as shown in fig. 5).
5. The liquid in the upper and lower circulation chambers continuously circulates, and the drilling tool 22 is used for pressing and pulling the drill rod 2 through the upper rotary rubber core assembly 1 after the back-off is completed (as shown in fig. 6).
6. The middle gate valve assembly 21 is closed to enable the upper circulation chamber and the lower circulation chamber to be independent, the drilling fluid of the upper circulation chamber 9 stops circulating, and the drilling fluid of the lower circulation chamber 8 continues circulating (as shown in fig. 7).
7. After the upper rotary rubber core assembly 1 is opened and the pressure of the upper circulation chamber 9 is released, the drill rod 2 is lifted to a wellhead through a control head to perform drill rod replacement operation (shown in fig. 8).
8. After the drill rod 2 is replaced, the drill rod 2 enters the upper circulation chamber 9 from the upper rotary rubber core assembly 1, the upper rotary rubber core assembly 1 is closed, the upper circulation chamber 9 becomes a sealing chamber, and drilling fluid in the upper circulation chamber 9 starts to circulate, so that the circulation pressure and the discharge capacity of the upper circulation chamber 9 are kept consistent with those of the lower circulation chamber 8 (as shown in fig. 9).
9. When the upper circulation chamber and the lower circulation chamber are kept consistent, the middle gate valve assembly 21 is opened, the upper circulation chamber 9 and the lower circulation chamber 8 form a sealed chamber for circulating drilling fluid, then the drill rod 2 is drilled down into the lower circulation chamber 8 to be butted with the drilling tool 22, and the hydraulic tongs or the top drive of the drill platform is used for buckling and completing tripping and butting (as shown in figure 10).
Finally, it should be noted that: the above embodiments are merely preferred embodiments of the present invention to illustrate the technical solution of the present invention, and are not meant to limit the scope of the present invention; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions; in addition, the technical scheme of the invention is directly or indirectly applied to other related technical fields, and the technical scheme is included in the scope of the invention.
Claims (7)
1. The tripping method of the tripping system of the controllable pressure continuous circulation drilling fluid is characterized in that the tripping system of the controllable pressure continuous circulation drilling fluid comprises a drill rod, an upper circulation chamber device, a lower circulation chamber device and an intermediate gate valve assembly; the upper circulation chamber device comprises an upper circulation chamber, a drilling fluid inlet and outlet chamber component, a pressure valve control component, an upper rotary rubber core component and a needle type back pressure control valve component which are arranged on the upper circulation chamber; the lower circulation chamber device comprises a lower circulation chamber, a drilling fluid inlet and outlet chamber component, a pressure valve control component and a lower rotary rubber core slip component which are arranged on the lower circulation chamber;
the drilling fluid inlet and outlet chamber component comprises a fluid inlet pipe arranged at the upper part of the upper circulation chamber or the lower circulation chamber respectively, and a fluid outlet pipe arranged at the lower part of the upper circulation chamber or the lower circulation chamber respectively; the liquid inlet pipe is provided with a liquid inlet control valve for controlling a switch and monitoring flow; the liquid outlet pipe is provided with a liquid outlet control valve for controlling a switch and monitoring flow;
the lower circulation chamber device further comprises a lower circulation chamber standby inlet and outlet pipe communicated with the middle part of the lower circulation chamber, and a control valve is arranged on the lower circulation chamber standby inlet and outlet pipe;
the tripping method comprises the following steps:
s1: connecting the drill rod with a drilling tool;
s2: opening the middle gate valve assembly, the upper rotary rubber core assembly and the lower rotary rubber core slip assembly, and then lifting the drill rod until the drilling tool joint hoop stretches into the lower circulation cavity;
s3: closing the upper rotary rubber core assembly and the lower rotary rubber core slip assembly, wrapping the drill rod by the upper rotary rubber core assembly, wrapping the drilling tool by the lower rotary rubber core slip assembly, forming a sealing chamber by the upper circulation chamber and the lower circulation chamber, filling the drilling fluid into the upper circulation chamber, and discharging the fluid from the lower circulation chamber;
s4: reversing the drilling tool;
s5: the liquid in the upper and lower circulating chambers continuously circulates, and the drilling tool plays a role in pressing a drill rod through the upper rotary rubber core component after the reverse buckling is completed;
s6: closing the middle flashboard valve assembly to enable the upper circulation chamber and the lower circulation chamber to be independent, stopping circulation of drilling fluid of the upper circulation chamber, and continuing circulation of drilling fluid of the lower circulation chamber;
s7: opening an upper rotary rubber core assembly, and lifting a drill rod to a wellhead through a control head to perform drill rod replacement operation after the pressure relief of an upper circulating cavity is finished;
s8: after the drill rod is replaced, the drill rod enters an upper circulation cavity from an upper rotary rubber core assembly, the upper rotary rubber core assembly is closed, the upper circulation cavity becomes a sealing cavity, drilling fluid of the upper circulation cavity starts to circulate, and the circulation pressure and the discharge capacity of the upper circulation cavity are kept consistent with those of the lower circulation cavity;
s9: when the upper circulation chamber and the lower circulation chamber are kept consistent, the middle gate valve assembly is opened, the upper circulation chamber and the lower circulation chamber form a sealing chamber for circulating drilling fluid, and then the drill rod is drilled down into the lower circulation chamber to be butted with the drilling tool.
2. The tripping method of the tripping system of the controllable-pressure continuous circulation drilling fluid, which is characterized by comprising the following steps: the middle gate valve assembly comprises an annular middle gate valve core for wrapping and fixing the drill rod and a shearing middle gate valve core for separating the upper cavity and the lower cavity.
3. The tripping method of the tripping system of the controllable-pressure continuous circulation drilling fluid, which is characterized by comprising the following steps: the pressure valve control assembly comprises pressure valve inlet and outlet channels which are respectively arranged on the upper circulation chamber or the lower circulation chamber, and needle type pressure control valves and pressure gauges are arranged on the pressure valve inlet and outlet channels.
4. The tripping method of the tripping system of the controllable-pressure continuous circulation drilling fluid, which is characterized by comprising the following steps: the upper rotary rubber core assembly is located at the upper end of the upper circulation chamber, the lower rotary rubber core slip assembly is located at the lower end of the lower circulation chamber, and the middle gate valve assembly is located between the upper circulation chamber and the lower circulation chamber.
5. The tripping method of the tripping system for the drilling fluid with controllable pressure continuous circulation according to claim 4, wherein the tripping method comprises the following steps: the upper rotary rubber core assembly comprises a rotary control head for sealing the upper circulation chamber and a rotary rubber core for wrapping the drill rod.
6. The tripping method of the tripping system for the drilling fluid with controllable pressure continuous circulation according to claim 4, wherein the tripping method comprises the following steps: the lower rotary rubber core slip assembly comprises a rotary control head for sealing the lower circulation chamber and a rotary rubber core for wrapping the drill rod; the lower rotary rubber core slip assembly further comprises a mechanical slip mechanism positioned at the lower part of the rotary control head.
7. The tripping method of the tripping system of the controllable-pressure continuous circulation drilling fluid, which is characterized by comprising the following steps: the needle type back pressure control valve assembly comprises a back pressure pipe communicated with the upper circulation chamber; and the back pressure pipe is provided with an upper circulation chamber back pressure compensation valve cock and an upper circulation chamber needle type back pressure compensation valve.
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| ATE293203T1 (en) * | 1996-10-15 | 2005-04-15 | Coupler Developments Ltd | DRILLING METHOD WITH CONTINUOUS CIRCULATION |
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