CN108952605B - Underground runner type pressure control device, underground pressure control drilling system and drilling method thereof - Google Patents
Underground runner type pressure control device, underground pressure control drilling system and drilling method thereof Download PDFInfo
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- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
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Abstract
The invention provides an underground runner type pressure control device, an underground pressure control drilling system and a drilling method thereof, wherein the underground runner type pressure control device comprises: an inner barrel connected with the drilling tool; the outer cylinder can rotate relative to the inner cylinder; the control component is connected to the outer barrel, receives an operation instruction and converts the instruction; and the linkage assembly is connected with the outer barrel and the control assembly, and changes the flow passage area in the shaft through linkage action under the action of the control assembly so as to realize shaft pressure regulation. The device is capable of applying back pressure downhole and above the formation only where needed to reduce or prevent drill-through.
Description
Technical Field
The invention relates to the technical field of petroleum drilling operation, in particular to an underground runner type pressure control device capable of implementing underground pressure control drilling, an underground pressure control drilling system and a drilling method thereof.
Background
Managed pressure drilling is an adaptive drilling technique that accurately controls the annular pressure profile throughout the wellbore. The technology can maintain the pressure of the shaft in the safe drilling fluid density window interval in the drilling process, can effectively avoid underground complex conditions such as stratum fluid invasion, leakage and the like, and is particularly suitable for wells with narrow safe drilling fluid density windows such as deep wells, deep wells and the like.
The pressure-controlled drilling system generally adopted at present mainly comprises a pressure measurement while drilling device (PWD), a rotary control head (RCD), an automatic throttling manifold, a control valve, a control center and a back pressure pump system. The basic principle is that a certain amount of back pressure is applied and adjusted at the ground (or an offshore platform) to achieve the aim of controlling the pressure of a shaft. Although the aim of controlling the pressure of the well bore can be achieved by adopting the technology, after the well head applies the back pressure, the pressure at each depth in the well bore is correspondingly increased by the back pressure value of the whole well head. Therefore, when a large wellhead back pressure is applied to balance a large formation pressure interval at the lower part of the open hole section, if the open hole upper interval is a stratum easy to leak, the risk of upper pressure leakage is increased. The pressure-controlled drilling mode of single wellbore pressure gradient which only depends on applying and adjusting wellhead back pressure cannot simultaneously meet the requirements of different intervals under the condition of certain narrow windows.
Therefore, there is a need for a managed pressure drilling system that can apply a back pressure downhole so that the back pressure is applied only above the desired formation, rather than at the wellhead, thus avoiding complications such as loss of the upper formation due to an increase in full wellbore pressure. But at present, relevant reports of relevant systems or devices capable of realizing the functions are not seen at home and abroad.
Disclosure of Invention
In view of some or all of the above technical problems in the prior art, the present invention provides a downhole flow channel type pressure control device, which can apply back pressure downhole and only above a required formation to reduce or prevent drilling leakage.
The invention relates to a down-hole flow channel type pressure control device, which comprises:
an inner barrel connected with the drilling tool;
the outer cylinder can rotate relative to the inner cylinder;
the control component is connected to the outer barrel, receives an operation instruction and converts the instruction; and
and the linkage assembly is connected with the outer barrel and the control assembly, and changes the flow passage area in the shaft through linkage action under the action of the control assembly so as to realize shaft pressure regulation.
The underground flow channel type pressure control device realizes pressure regulation in a shaft by receiving a control instruction and changing the flow channel area in a stratum needing pressure control in the pit, so that back pressure can be applied only above the required stratum instead of a well head, and the complex conditions of upper stratum leakage and the like caused by the increase of the pressure of the whole well barrel can be avoided.
In one embodiment, the control assembly comprises:
the decoding mechanism is connected to the outer barrel and receives an operation instruction and converts the operation instruction into an action instruction of the motor; and
and the motor receives the action instruction of the decoding mechanism and drives the linkage assembly to work. Here, the decoding mechanism can control the motor to work according to the instruction after receiving the operation instruction, and the linkage assembly is controlled by controlling the motor to start, stop, rotate speed and the like, so that the flow area is further influenced, and the pressure in the shaft is controlled.
In one embodiment, the linkage assembly comprises a transmission threaded shaft, a transmission connecting rod and a runner umbrella wing mechanism, wherein the transmission threaded shaft is connected with the motor and the transmission connecting rod and converts the rotation of the motor into the linear motion of the transmission connecting rod; the transmission connecting rod is connected with the runner umbrella wing mechanism to drive the runner umbrella wing mechanism to open and close. The rotation of the motor is converted into the opening angle of the runner umbrella wing mechanism, the area of a runner in a shaft is greatly reduced along with the increase of the opening angle of the runner umbrella wing mechanism, and the local flow resistance is obviously increased to form back pressure and form underground pressure control. In this case, the back pressure acts only on the corresponding formation, with little effect on the wellhead.
In a preferred embodiment, the flow area in the well bore decreases when the flow umbrella wing mechanism is opened and increases when the flow umbrella wing mechanism is closed. The back pressure is controlled by changing the area of the flow passage.
In one embodiment, the runner umbrella wing mechanism comprises:
the connecting block is connected with the transmission threaded shaft; and
one end of the umbrella wing is connected with the transmission connecting rod, and the other end of the umbrella wing is connected with the connecting block and arranged around the connecting block. The umbrella wings are opened and closed around the connecting blocks, the corresponding flow area in the shaft is reduced when the umbrella wings are opened, and the corresponding flow area in the shaft is increased when the umbrella wings are closed. The rotation of the electrode is converted into the linear motion of the transmission connecting rod so as to drive the umbrella wings to open.
In one embodiment, the number of the umbrella wings is equal to the number of the umbrella wings circumferentially arranged around the connecting block. The cross section of pit shaft is usually circular, sets up a plurality of full-blown umbrella wings circumference equidistant and encircles the connecting block setting and can make the back pressure of pit shaft each department stable rapidly in the short time, and the pressure that each full-blown umbrella wing received is also relatively more balanced.
In a preferred embodiment, the decoding mechanism is a radio frequency identification mechanism which can interpret the instruction electronic tag and convert the interpreted instruction into a start or stop instruction to the motor. The decoding mechanism is preferably a radio frequency identification mechanism, which can be conveniently applied in a well.
In another aspect, the present invention provides a downhole managed pressure drilling system comprising:
a continuous drilling apparatus comprising an uphole controller and a downhole drilling tool;
the PWD/APWD measurement-while-drilling nipple is connected with the continuous drilling device and feeds pressure data back to an aboveground controller when detecting that the drilling tool reaches a set pressure-controlled formation section; and
the underground runner type pressure control device is connected with the drilling tool, receives an operation instruction sent by a controller on the well, and starts the pressure adjustment of the shaft to realize the pressure control drilling of the continuous drilling device.
The underground pressure-controlled drilling system can realize pressure-controlled drilling of any formation section underground, and the back pressure is not easy to influence other formation sections easy to leak, so that the application range of the pressure-controlled drilling is expanded.
In one embodiment, the system is suitable for continuous drilling of narrow safe drilling fluid density window intervals and multi-gradient continuous drilling. The method is suitable for the continuous drilling which is difficult to realize the pressure control drilling or easy to drill the leaked stratum by adopting the pressure control drilling.
In yet another aspect, the present invention also provides a downhole managed pressure drilling method, comprising the steps of:
the underground measurement while drilling nipple detects a pressure-controlled drilling stratum section and feeds data back to an aboveground controller;
the controller sends an operation instruction to the underground runner type pressure control device, and the underground runner type pressure control device adjusts the pressure in the shaft;
after the pressure in the shaft is adjusted to a preset value, pressure control drilling is started;
the underground flow channel type pressure control device adopts the underground flow channel type pressure control device.
Compared with the prior art, the invention has the advantages that:
the invention can apply back pressure underground, thereby effectively avoiding applying the back pressure value to each depth of the whole well bore, avoiding pressing and leaking the upper weak stratum and reducing the occurrence of underground complex conditions such as leakage and the like. Therefore, the invention can expand the application range of the pressure-controlled drilling, and the pressure-controlled drilling is suitable for well sections with narrower safe drilling fluid density windows. And the invention can realize multi-gradient drilling, drill more pressure system stratums in an open hole section, greatly save drilling time and reduce drilling cost.
Drawings
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, in which:
FIG. 1 shows a schematic of a conventional managed pressure drilling system;
FIG. 2 shows a schematic structural diagram of one embodiment of a downhole managed pressure drilling system of the present invention;
FIG. 3 is a graph showing wellbore pressure for a conventional managed pressure drilling method compared to wellbore pressure for a downhole managed pressure drilling method of the present invention;
FIG. 4 is a schematic structural diagram of one embodiment of a downhole flow path pressure control device of the present invention;
FIG. 5 is a schematic diagram illustrating a comparison of the open and closed states of the flow path downhole pressure control device of FIG. 4;
FIG. 6 is a schematic cross-sectional view of the open and closed states of the pressure control device of FIG. 5.
In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.
Detailed Description
In order to make the technical solutions and advantages of the present invention more apparent, exemplary embodiments of the present invention are described in further detail below with reference to the accompanying drawings. It is clear that the described embodiments are only a part of the embodiments of the invention, and not an exhaustive list of all embodiments. And the embodiments and features of the embodiments may be combined with each other without conflict.
FIG. 3 is a graph showing wellbore pressure for a conventional managed pressure drilling method compared to wellbore pressure for a downhole managed pressure drilling method of the present invention. In fig. 3:
pLfor a safe drilling fluid density lower limit pressure curve, the larger value between the collapse pressure and the formation pore pressure is generally taken;
pHfor the safe drilling fluid density upper limit pressure curve, the smaller value between the fracture pressure and the loss pressure is generally taken;
pρ1for using drilling fluid with density of rho1A wellbore pressure profile;
pρ1'for using drilling fluid with density of rho1A well bore pressure curve after the well mouth applies back pressure delta p;
pρ2for using drilling fluid with density of rho2A wellbore pressure profile;
pρ2'for using drilling fluid with density of rho2At time and depth D3A wellbore pressure curve after increasing the back pressure Δ p';
D1、D2、D3、D4、D5respectively representing the well depth;
pρ11to adoptDensity p of drilling fluid1Depth of time well D1The value of the wellbore pressure;
pρ1'1for using drilling fluid density rho1And the well head applies back pressure delta p and the well depth D1The value of the wellbore pressure;
pρ12for using drilling fluid density rho1Depth of time well D2The value of the wellbore pressure;
pρ1'2for using drilling fluid density rho1And the well head applies back pressure delta p and the well depth D2The value of the wellbore pressure;
pρ22for using drilling fluid density rho2Depth of time well D2The value of the wellbore pressure;
pρ23for using drilling fluid density rho2Depth of time well D3The value of the wellbore pressure;
pρ23for using drilling fluid density rho2Time, well depth D3The value of the wellbore pressure after the back pressure Δ p' is applied.
The inventor notices in the course of the invention that if the well section drilling encounters two sets of strata, one set is a vulnerable stratum (the vulnerable stratum 8 ' in fig. 1, the vulnerable stratum 8 ' in fig. 2, two different reference numerals are used herein to distinguish and show in the two sets of drilling systems), and the other set is an abnormally high pressure stratum (the vulnerable stratum 9 ' in fig. 1, the vulnerable stratum 9 in fig. 2, two different reference numerals are used herein to distinguish and show in the two sets of systems). During normal drilling, it is necessary to ensure that the wellbore pressure lies within the established drilling fluid density safety window as represented by the grey portion of fig. 3. When the drilling fluid with the density of rho 1 is selected for drilling in a conventional drilling mode, the pressure distribution of the whole well bore is as shown by a curve p in figure 3ρ1Shown at well depth D1Meets the requirement of a safety window, but reaches the well depth D along with the increase of the well drilling depth4When the pressure is in the safe window interval, the pressure of the whole well cylinder does not meet the requirement of the safe window interval. If the traditional pressure control drilling is adopted, when the back pressure delta p is applied to the wellhead, the pressure of the shaft is as the curve p in figure 3ρ1'Albeit at well depth D4Can meet the interval requirement of a safety window but reaches the well depth D5The well completion depth D of one casing layer can not be achieved by adopting the traditional pressure control well drilling mode1To well depth D2A wellbore interval (see figure 1). In addition, due to the upper well depth D1The well has a easily-leaked stratum 8 ', and the leakage of the upper stratum and other complex conditions are easily caused when the whole well bore is pressurized by the well head pressure control system 7'.
In view of the above disadvantages, an embodiment of the present invention provides a down-hole flow channel type pressure control device 10, which is described below.
As shown in fig. 3, 4 and 5, the down-hole flow channel type pressure control device 10 of the present invention mainly includes an inner cylinder, an outer cylinder, a control assembly and a linkage assembly. The inner cylinder mainly plays a role of connecting a drilling tool and comprises an inner cylinder body, a left connecting part 11 arranged at the left end, a left bearing 12, a right bearing 19 and a right connecting part 20. In a preferred embodiment, the left connecting portion 11, the inner cylinder and the right connecting portion 20 may be formed as an integral structure. The outer cylinder is connected with the inner cylinder through a left bearing 12 and a right bearing 19, so that the inner cylinder can rotate relative to the outer cylinder. During drilling, the inner cylinder rotates with the drilling tool, and the outer cylinder can be kept in a relatively stable and non-rotating state. The control component is connected to the outer barrel and mainly plays a role in receiving an operation instruction and converting the instruction. The linkage assembly is connected with the outer barrel and the control assembly and changes the flow passage area in the shaft through linkage action under the control action of the control assembly so as to adjust the pressure of the shaft.
That is, the downhole flow channel type pressure control device 10 of the present invention changes the flow channel area through the linkage assembly to realize the back pressure in the formation section needing pressure control in the downhole by receiving the control instruction, so that the back pressure can be applied only on the required formation instead of the wellhead, thereby avoiding the occurrence of complex situations such as upper formation leakage caused by the increase of the pressure of the whole wellbore.
In one embodiment, the control assembly primarily includes a decode mechanism 17 and a motor 16. The decoding mechanism 17 is connected to the outer cylinder, receives an operation command and converts the operation command into an action command of the motor. And the motor 16 receives the action command of the decoding mechanism 17 and drives the linkage assembly to work. Here, after receiving the operation command, the decoding mechanism 17 can control the motor 16 to start, stop, rotate according to the command, and further influence the action amplitude or the opening angle of the linkage assembly, thereby controlling the pressure in the wellbore.
In a preferred embodiment, the linkage assembly consists essentially of a drive threaded shaft 15, a drive link 14, and a runner mechanism 13. Wherein, the transmission threaded shaft 15 is connected with the output end of the motor 16 and one end of the transmission connecting rod 14, and the transmission threaded shaft 15 converts the rotation of the motor 16 into the linear motion of the transmission connecting rod 14. The other end of the transmission connecting rod 14 is connected with one end of the runner umbrella wing mechanism 13 to drive the runner umbrella wing mechanism 13 to open and close.
In the invention, the rotation of the motor 16 is converted into the opening angle of the runner umbrella wing mechanism, and the area of the runner in the shaft is greatly reduced along with the increase of the opening angle of the runner umbrella wing mechanism, so that the local flow resistance is obviously increased to form back pressure and form underground pressure control. In this case, the back pressure acts only on the corresponding formation, with little effect on the wellhead.
In one embodiment, the flow area in the wellbore is reduced when the flow umbrella wing mechanism 13 is deployed. When the runner umbrella wing mechanism 13 is closed, the runner area in the shaft is increased. The back pressure can be controlled by changing the area of the flow passage.
In one embodiment, the runner parachute wing mechanism 13 mainly comprises a connecting block and a parachute wing. Wherein the connecting block is connected with a transmission threaded shaft 15. One end of the umbrella wing is connected with a transmission connecting rod 14, and the other end of the umbrella wing is rotatably connected with one end of the connecting block, which is far away from a transmission threaded shaft 15. The wings open and close around the connecting block. The rotation of the electrode 16 is converted into linear motion of the drive link 14 to cause the wings to open.
In a preferred embodiment, the umbrella wings comprise a plurality of umbrella wings which are circumferentially arranged around the connecting block at equal intervals. The cross section of the shaft is generally circular, and as shown in fig. 6, the corresponding flow area in the shaft is reduced when the umbrella wings are opened, and the corresponding flow area in the shaft is increased when the umbrella wings are closed. The arrangement of the plurality of umbrella wings circumferentially and equidistantly surrounding the connecting block can quickly stabilize the back pressure of each part of the shaft in a short time, and the pressure applied to each umbrella wing is relatively balanced.
In a preferred embodiment, the decoding means 17 is preferably a radio frequency identification means which interprets the instructional electronic label and converts it into a start or stop command for the motor 16. The decoding mechanism is a radio frequency identification mechanism mainly for facilitating underground application.
In another aspect of the invention, the invention also provides a downhole managed pressure drilling system. The structure and advantages of the downhole managed pressure drilling system of the present invention shown in FIG. 2 are described in comparison with the conventional managed pressure drilling system of FIG. 1.
In fig. 1 and 2, the same parts mainly include: the drilling platform comprises drilling platforms 1 'and 1, pipe sleeves 2' and 2, drill strings 3 'and 3, weak or easily-leaking strata 8' and 8, open hole well wall sections 4 'and 4, drilling fluid in a shaft 5' and 5, measurement-while-drilling short joints 6 'and 6 and abnormal high-pressure strata 9' and 9. Wherein D is used1Indicating weak formation well depth, D2Indicating an abnormally high pressure formation well depth.
The differences between fig. 1 and fig. 2 are mainly: the conventional managed pressure drilling system of fig. 1 employs a wellhead managed pressure drilling device 7'; whereas the downhole managed pressure drilling system of the present invention of fig. 2 employs a continuous drilling device 7 and a down-hole flow-path-type managed pressure device 10. And the well depth of the down-hole flow channel type pressure control device 10 adopts D3And (4) showing.
In one embodiment of the present invention, the downhole managed pressure drilling system of the present invention consists essentially of: a continuous drilling device 7, a PWD/APWD measurement-while-drilling nipple 6 (not shown in fig. 2) and a downhole flow path pressure control device 10 as described above. Wherein the continuous drilling device 7 mainly comprises an uphole controller and a downhole drilling tool. The PWD/APWD measurement-while-drilling nipple 6 is connected with a continuous drilling device and is generally put into a well along with a drilling tool. And when the measurement-while-drilling nipple 6 detects that the drilling tool reaches the set pressure-control formation section, feeding back pressure data to an uphole controller. The uphole controller then sends operating instructions to the downhole flow path pressure control device 10 under the operation of the operator. And the underground runner type pressure control device is connected with the drilling tool, and after receiving an operation instruction sent by an aboveground controller, the pressure adjustment of the shaft is started to realize the pressure control drilling of the continuous drilling device.
Because the adopted underground flow channel type pressure control device 10 can control the pressure underground, the underground pressure control drilling system can realize the pressure control drilling of any underground stratum section in principle, and the back pressure is directly loaded in the stratum section needing to be increased, so that the upper stratum section easy to leak is not easily influenced, and the application range of the pressure control drilling is enlarged.
In a preferred embodiment, the system is suitable for continuous drilling of narrow safe drilling fluid density window intervals and for continuous drilling of multiple gradients.
In still another aspect of the present invention, a method for downhole managed pressure drilling is also provided based on the same or similar inventive concepts as above. The method mainly comprises the following steps:
the underground measurement while drilling nipple 6 detects a pressure-controlled drilling stratum section and feeds data back to an aboveground controller;
the controller sends an operation instruction to the underground flow channel type pressure control device 10, and the underground flow channel type pressure control device 10 adjusts the pressure in the shaft;
after the pressure in the shaft is adjusted to a preset value, pressure control drilling is started;
the downhole flow channel type pressure control device adopts the downhole flow channel type pressure control device 10.
In a preferred embodiment, the downhole flow path pressure control device 10 is lowered when the drilling tool is assembled, as shown in FIG. 2. When drilling into a weak or easily leaking formation 8, drilling is performed with a lower density drilling fluid, and the downhole flow channel type pressure control device 10 is in a closed state. When the drilling engineering personnel (or the operating personnel) puts an electronic tag body on the ground when the drilling engineering personnel (or the operating personnel) is about to drill into the abnormal high-pressure stratum 9, when the electronic tag flows through the decoding mechanism 17 of the underground runner type pressure control device 10, the decoding mechanism 17 explains and processes information arranged in the tag, sends a parameter instruction according to the requirement of the engineering personnel, starts the motor 16, and drives the transmission connecting rod 14 to do linear motion by rotating the transmission threaded shaft 15, so that the runner umbrella wing mechanism 13 is opened. When the motor 16 is started for a certain time according to the instruction sent by the decoding mechanism 17 and then stops, the runner umbrella wing mechanism 13 is opened to one according to the requirementTo a certain extent, refer to fig. 5. After the flow channel umbrella wing mechanism 13 is opened, as shown in fig. 6, the annular flow channel area at the position of the downhole pressure control device is reduced from the original A to A', and the sudden change of the flow area can form larger additional flow friction resistance, as shown in fig. 3, so that the depth D of the downhole pressure control device can be increased3Will form a back pressure delta p' to form a bending line, thereby ensuring that the wellbore pressure of the lower abnormal high-pressure stratum wellbore section is increased on the premise of not increasing the wellbore pressure of the upper weak or easily-leaking stratum wellbore section, so that the wellbore pressure of the whole wellbore section is always kept in a safe drilling fluid density window interval, such as a curve p in fig. 3ρ2'As shown.
In addition, the application of the continuous drilling device 7 can maintain the underground pressure control state under the working condition of a single or a stand column, and underground pressure control drilling in the whole drilling process is realized. As shown in fig. 2, the downhole measurement while drilling nipple 6 feeds back bottom hole pressure data in real time, and is helpful for ground engineering personnel to send out electronic tags with different parameter information in real time according to the bottom hole pressure condition, so as to adjust the opening degree of the umbrella wings of the downhole flow channel type pressure control device 10, control the annular flow area occupied by the downhole flow channel type pressure control device 10 in real time, and adjust the applied downhole back pressure in real time.
In addition, in an embodiment not shown, the down-hole flow channel type pressure control device 10 can be respectively arranged at different positions of the drilling tool, so that the continuous drilling in a well section with a plurality of stratum sections with different pressure levels is adapted, and the multi-gradient drilling function is realized.
It is also important to note that the grey portion of fig. 1, 2 and 6 all represent drilling fluid. The presence of drilling fluid, i.e. fluid pressure, is meant to be primarily convenient to distinguish from other non-drilling devices.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, the appended claims are intended to be construed to include preferred embodiments and all such changes and/or modifications as fall within the scope of the invention, and all such changes and/or modifications as are made to the embodiments of the present invention are intended to be covered by the scope of the invention.
Claims (7)
1. A downhole flow channel type pressure control device, comprising:
an inner barrel connected with the drilling tool;
the outer cylinder can rotate relative to the inner cylinder;
the control component is connected to the outer barrel, receives an operation instruction and converts the instruction; and
the linkage component is connected with the outer cylinder and the control component, and changes the flow passage area in the shaft through linkage action under the action of the control component so as to realize shaft pressure regulation,
wherein, the control component comprises a decoding mechanism and a motor, wherein the decoding mechanism is connected on the outer cylinder and receives an operation instruction and converts the operation instruction into an action instruction of the motor, the motor receives the action instruction from the decoding mechanism and drives the linkage component to work,
the linkage assembly comprises a transmission threaded shaft, a transmission connecting rod and a runner umbrella wing mechanism, wherein the transmission threaded shaft is connected with the motor and the transmission connecting rod, and the rotation of the motor is converted into the linear motion of the transmission connecting rod; the transmission connecting rod is connected with the runner umbrella wing mechanism to drive the runner umbrella wing mechanism to open and close, wherein the runner area in the shaft is reduced when the runner umbrella wing mechanism is opened, and the runner area in the shaft is increased when the runner umbrella wing mechanism is closed.
2. The device of claim 1, wherein the runner mechanism comprises:
the connecting block is connected with the transmission threaded shaft; and
one end of the umbrella wing is connected with the transmission connecting rod, and the other end of the umbrella wing is connected with the connecting block and arranged around the connecting block.
3. The device of claim 2, wherein the plurality of wings are circumferentially equally spaced around the connecting block.
4. A device according to any one of claims 1 to 3, wherein the decoding means is a radio frequency identification means which interprets the instructional electronic label and converts it into a start or stop instruction to the motor.
5. A downhole managed pressure drilling system, comprising:
a continuous drilling apparatus comprising an uphole controller and a downhole drilling tool;
the PWD/APWD measurement-while-drilling nipple is connected with the continuous drilling device and feeds pressure data back to an aboveground controller when detecting that the drilling tool reaches a set pressure-controlled formation section; and
the device of any one of claims 1 to 4, wherein the device is connected to a drilling tool, receives an operation command from a controller in the well, and initiates wellbore pressure adjustment to realize pressure-controlled drilling of the continuous drilling device.
6. The system of claim 5, wherein the system is adapted for continuous drilling of narrow safe drilling fluid density window intervals and for continuous drilling of multiple gradients.
7. A method of downhole managed pressure drilling, the method comprising the steps of:
the underground measurement while drilling nipple detects a pressure-controlled drilling stratum section and feeds data back to an aboveground controller;
the controller sends an operation instruction to the underground runner type pressure control device, and the underground runner type pressure control device adjusts the pressure in the shaft;
after the pressure in the shaft is adjusted to a preset value, pressure control drilling is started;
the device of any one of claims 1 to 4 is adopted in the downhole flow-path type pressure control device.
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| US20160251920A1 (en) * | 2013-10-31 | 2016-09-01 | Halliburton Energy Services, Inc. | Hydraulic control of borehole tool deployment |
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