CN108756787B - Auxiliary device, continuous circulation drilling system and drilling method thereof - Google Patents
Auxiliary device, continuous circulation drilling system and drilling method thereof Download PDFInfo
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- CN108756787B CN108756787B CN201810517046.9A CN201810517046A CN108756787B CN 108756787 B CN108756787 B CN 108756787B CN 201810517046 A CN201810517046 A CN 201810517046A CN 108756787 B CN108756787 B CN 108756787B
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- 238000005553 drilling Methods 0.000 title claims abstract description 159
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000012530 fluid Substances 0.000 claims abstract description 70
- 230000000149 penetrating effect Effects 0.000 claims abstract description 7
- 210000002445 nipple Anatomy 0.000 claims description 25
- 238000005086 pumping Methods 0.000 claims description 25
- 238000002360 preparation method Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012065 filter cake Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
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Abstract
The invention relates to the technical field of drilling, and discloses an auxiliary device, a continuous circulation drilling system and a drilling method thereof, wherein the auxiliary device comprises a shell (10) and a drilling fluid supply assembly, a port (11) for connecting with the drilling fluid supply assembly is arranged at the first end of the shell (10), a hollow shaft body (20) is rotatably arranged in the shell (10), the hollow part of the hollow shaft body (20) is communicated with the port (11) and penetrates out of the second end of the shell, and a connecting part (21) for connecting with a circulation short section of the continuous circulation drilling system is arranged at the part of the hollow shaft body (20) penetrating out of the shell (10). By utilizing the auxiliary device provided by the invention, when the continuous circulation drilling system carries out side circulation column connection, the continuous circulation of the drilling fluid can be ensured, and the down-hole drill string stop time can be greatly reduced, so that the problems of sticking and sticking of the drill bit and the like are prevented.
Description
Technical Field
The invention relates to a drilling technology, in particular to an auxiliary device, a continuous circulation drilling system and a drilling method thereof.
Background
Drilling is the process of drilling a cylindrical borehole from the surface to the subsurface to a depth using mechanical equipment and related techniques. With the development and progress of oil and gas drilling technology, operators can drill various wells with great technical difficulty, such as deep wells, ultra-large deep wells, horizontal wells, extended reach wells, multi-bottom wells and the like, by applying the novel drilling technology. For example, offshore drilling from shallow water to deep water and ultra-deep water has achieved great success.
During the drilling process, in order to maintain stable borehole pressure and solve a series of abnormal problems caused by stopping the circulation of mud in a well during make-up, make-up and tripping of a conventional drilling well, the borehole is required to maintain a continuous mud circulation state during the drilling process. Due to the continuous circulation of the mud in the drilling process, the stability of the pressure of the well bore is kept, the back pressure value of the annulus can be well controlled, the stability of the well wall and the good cleaning effect of the well bore are kept, the collapse and the formation of a rock debris bed in an inclined shaft section are prevented, various complex conditions such as collapse, blowout leakage and the like are avoided, and thus a great number of complex process problems can be solved. In addition, the continuous circulation of the mud in the drilling process has great significance for ensuring the underground safety, shortening the drilling time and reducing the drilling cost, and especially plays a key role in wells with complex geological conditions.
Although the traditional continuous circulation drilling system can ensure the continuous circulation of mud in the drilling process, namely, the continuous circulation state of mud in a borehole is realized in the processes of screwing up, screwing down and drilling down in the drilling process without stopping a pump, the continuous circulation drilling system can only avoid the problems of rock debris bed or drill sticking and the like caused by static sediment of mud due to the stopping of the pump, and when drilling into a deep stratum, the continuous circulation of drilling fluid is far from enough to ensure when the operation of connecting an upright column is carried out. This is because as the formation deepens, the pressure difference between the pressure of the drilling fluid column and the formation pressure increases, and if the drill string is stationary, the drill string 600 will be pressed against the well wall 400 under the action of the pressure difference, so as to cause formation of stuck drill (stuck drill, also called differential stuck drill, which means that the filter cake 500 formed when solid particles in the drilling are adsorbed on the well wall 400 causes sticking and sticking of the drill string 600 in the well, as shown in fig. 2), so that the drilling operation cannot be performed normally.
Disclosure of Invention
The invention aims to solve the problem of sticking stuck drill bits in the prior art, and provides an auxiliary device which can greatly reduce the down-hole drill string stop time when an upright post is connected, so that the purpose of preventing sticking stuck drill bits and other problems is achieved.
In order to achieve the above object, an aspect of the present invention provides an auxiliary device for a continuous circulation drilling system, the auxiliary device including a housing and a drilling fluid supply assembly, a port is disposed at a first end of the housing for connecting with the drilling fluid supply assembly, a hollow shaft body is rotatably disposed in the housing, a hollow portion of the hollow shaft body is communicated with the port and penetrates out from a second end of the housing, and a connecting portion for connecting with a circulation short section of the continuous circulation drilling system is disposed at a portion of the hollow shaft body penetrating out of the housing.
Preferably, the auxiliary device comprises a pressure bearing and a positioning bearing, the pressure bearing is sleeved on the middle part of the hollow shaft body, and the positioning bearing is sleeved on the end part of the hollow shaft body.
Preferably, the positioning bearing comprises a first positioning bearing and a second positioning bearing which are respectively positioned at two sides of the bearing.
Preferably, a first positioning sleeve is arranged between the first positioning bearing and the first end of the housing along the axial direction, and a second positioning sleeve is arranged between the second positioning bearing and the second end of the housing along the axial direction.
Preferably, the housing includes a body, and a first cover and a second cover detachably connected to two ends of the body, the interface is disposed on the first cover, and the hollow shaft can rotate relative to the first cover and the second cover.
Preferably, an elbow connected with the interface is arranged at the interface, and the elbow is integrally formed with the first cover body.
Preferably, the hollow shaft body is in dynamic seal with the first cover body and the second cover body respectively.
Preferably, the connecting part is an internal thread or an external thread; and/or the centerline of the hollow shaft body is collinear with the centerline of the housing.
Preferably, one end of the hollow shaft body is aligned with and spaced from the interface.
The invention provides a continuous circulation drilling system, which comprises a drilling tool, a circulation short section connected with the drilling tool and the auxiliary device, wherein the part of the hollow shaft body penetrating out of the shell can be connected with the circulation short section through the connecting part.
In a third aspect the present invention provides a drilling method for use in the above continuous circulation drilling system, the method comprising the steps of:
when the upright column is connected, stopping drilling, pumping drilling fluid into the circulating short section from a lateral valve of the circulating short section, and stopping pumping drilling fluid into the circulating short section from a central valve of the circulating short section;
connecting the part of the hollow shaft body penetrating out of the shell with the circulation short section through the connecting part, pumping drilling fluid from the interface of the auxiliary device, and stopping pumping the drilling fluid from the lateral valve of the circulation short section;
enabling the circulation short section to rotate, after the preparation work of the connecting upright column is finished, enabling the circulation short section to stop rotating, stopping pumping the drilling fluid into the interface, and simultaneously enabling the drilling fluid to be pumped from the lateral valve of the circulation short section again;
the connection between the hollow shaft body and the circulation short section is disassembled, a prepared new upright post is connected with the circulation short section, then the pumping of the drilling fluid into the lateral valve of the circulation short section is stopped, and meanwhile the drilling fluid is pumped into the central valve of the circulation short section again;
and enabling the circulating short joint to rotate again to continue drilling work.
By utilizing the auxiliary device provided by the invention, when the continuous circulation drilling system carries out side circulation column connection, the continuous circulation of the drilling fluid can be ensured, and the down-hole drill string stop time can be greatly reduced, so that the aim of preventing sticking and sticking of the drill string and other problems is fulfilled.
Drawings
Fig. 1 is a schematic diagram of a prior art continuous circulation drilling system.
FIG. 2 is a schematic illustration of the continuous circulation drilling system of FIG. 1 showing a stuck drill condition;
FIG. 3 is a schematic structural view of a circulation sub of the continuous circulation drilling system shown in FIG. 1;
fig. 4 is a schematic structural diagram of an auxiliary device according to an embodiment of the present invention.
Description of the reference numerals
10-a housing; 11-an interface;
12-a body; 13-a first cover;
14-a second cover; 15-bending the pipe;
20-hollow shaft body; 21-a connecting part;
30-a pressure bearing; 40-positioning the bearing;
41-a first positioning bearing; 42-a second positioning bearing;
51-a first positioning sleeve; 52-a second locator sleeve;
61-a first sealing ring; 62-a first rubber oil seal;
63-a second seal ring; 64-a second rubber oil seal;
65-a first snap spring; 66-a second clamp spring;
100-a control system; 200-circulation short section;
210-a central valve; 220-a lateral valve;
300-a hook assembly; 400-well wall;
500-a filter cake; 600-drill string.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
In the present invention, unless otherwise specified, use of directional terms such as "upper, lower, left, right, top, bottom" is generally made with respect to the orientation shown in the drawings or with respect to the positional relationship of the components with respect to each other in the vertical, or gravitational direction. The term "inside" and "outside" refer to the inside and the outside of the contour of each member itself. In addition, "a plurality" referred to in the present invention means two or more and includes two.
For a clear understanding of the present invention, a prior art continuous circulation drilling system is first analyzed, specifically as follows: the conventional continuous circulation drilling system mainly comprises two parts, namely a circulation short joint 200 and a control system 100, wherein the circulation short joint 200 is connected with a drilling tool (the drilling tool comprises a drill string, a drill bit and the like), the circulation short joint 200 is suspended through a hook assembly 300, a control manifold is regulated by the control system 100 during the drilling process, and the circulation short joint 200 realizes the switching between a main circulation and a side circulation (the main circulation and the side circulation are described in detail below), as shown in fig. 1, the continuous circulation drilling system in the prior art is structurally schematic.
To facilitate an understanding of the present invention, a detailed description of how the loop sub 200 effects the switching of the primary side loops is provided below.
First, it is required to briefly introduce a circulation nipple 200, as shown in fig. 3, the circulation nipple 200 has a hollow circulation passage (the circulation passage is also referred to as a main circulation passage hereinafter) in which a central valve 210 is disposed and a side valve 220 is disposed at a side of the hollow circulation passage, and when a drilling fluid is pumped from the side valve, i.e., a side circulation is performed, the central valve 210 is automatically closed by a drilling fluid pressure. Next, for the convenience of understanding and description, several terms are defined herein, specifically, the term "main circulation" in the present invention refers to the circulation of drilling fluid (e.g., mud) flowing through the central valve 210 of the circulation nipple from top to bottom during drilling (the lateral valves are closed during the main circulation), the term "side circulation" refers to the circulation of drilling fluid flowing through the lateral valves 220 on the lateral sides of the circulation nipple from top to bottom when the connection of the stand column is required (the central valve is closed during the measurement circulation), and it should be noted that, in the following, when the continuous circulation of drilling fluid is maintained by the auxiliary device of the present invention, the circulation of drilling fluid flowing through the central valve 210 of the circulation nipple from top to bottom is also possible, but the circulation is not performed during drilling and thus cannot be regarded as the main circulation, and may be referred to as "auxiliary circulation" herein.
How the circulation nipple realizes the conversion of the main side circulation is described in detail as follows: during initial operation, namely drilling tools are drilled, drilling fluid flows through the central valve 210 of the circulation nipple 200 from top to bottom to realize main circulation, when an upright column needs to be connected after the drilling operation is carried out for a period of time, the drilling tools in the well are stopped to rotate firstly, the circulation nipple 200 is fixed at the well mouth by using slips, then the high-pressure hose is connected with the lateral valve 220 of the circulation nipple 200, after the connection is completed, the pumping of the main circulation drilling fluid is stopped, and meanwhile, the drilling fluid is pumped from the lateral valve 220 to realize the lateral circulation, so that the conversion from the main circulation to the measurement circulation is realized, and as the lateral circulation is carried out, the drilling fluid keeps continuous circulation, but the drilling string stops rotating in the process, and the longer the stopping time of the drilling string is, the more the drilling rod is likely to be wrapped.
In order to solve the problems, the drill stem stalling time during the connection of the stand column is shortened, so that the problem of drill jamming easily caused during the connection of the stand column is effectively solved, and the specific scheme is as follows:
according to one aspect of the invention, the drill string stall time is reduced as much as possible when the column is short-circuited by means of an auxiliary device, which, in particular, as shown in fig. 4, the auxiliary device comprises a housing 10 and a drilling fluid supply assembly, a first end of the housing 10 is provided with an interface 11 for connecting with the drilling fluid supply assembly, a hollow shaft body 20 is rotatably arranged in the housing 10, the hollow part of the hollow shaft body 20 is communicated with the interface 11 and penetrates out of the second end of the housing, the part of the hollow shaft body 20 penetrating out of the shell 10 is provided with a connecting part 21 (the connecting part 21 is an internal thread or an external thread) for connecting with a circulation short section of a continuous circulation drilling system, for convenience of installation and design, it is preferable that the center line of the hollow shaft body 20 is collinear with the center line of the housing 10.
According to another aspect of the present invention, the continuous circulation drilling system provided by the embodiment of the present invention comprises a drilling tool, a circulation sub 200 connected with the drilling tool, and the above-mentioned auxiliary device, wherein the part of the hollow shaft body 20 penetrating out of the housing 10 can be connected with the circulation sub 200 through a connecting part 21.
According to yet another aspect of the present invention, embodiments of the present invention provide a drilling method for the continuous circulation drilling system, comprising the steps of:
when the vertical column is connected, stopping drilling, and pumping drilling fluid from the lateral valve 220 of the circulation nipple 200, and simultaneously stopping pumping drilling fluid from the central valve 210 of the circulation nipple 200 (namely, switching from the main circulation to the measuring circulation);
the part of the hollow shaft body 20 which penetrates out of the housing 10 is connected with the circulation nipple through a connection part 21 (for example, a threaded connection can be adopted), and drilling fluid is pumped in from the interface 11 of the auxiliary device, and meanwhile, the pumping of the drilling fluid from the side valve 220 of the circulation nipple 200 is stopped (namely, the side circulation is switched to the auxiliary circulation);
the circulation short section is rotated, after the preparation work of the connecting upright column is finished, the circulation short section is stopped rotating, the pumping of the drilling fluid into the interface 11 is stopped, and the drilling fluid is pumped from the lateral valve of the circulation short section again (namely, the auxiliary circulation is switched to the lateral circulation);
the connection between the hollow shaft body 20 and the circulation nipple 200 is disassembled, a prepared new upright column is connected with the circulation nipple 200, then the pumping of the drilling fluid to the lateral valve of the slave circulation nipple is stopped, and meanwhile the drilling fluid is pumped from the central valve of the circulation nipple again (namely, the slave circulation is converted into the main circulation);
the circulation nipple 200 is rotated again to continue the drilling work.
In the invention, when an upright column needs to be connected in a drilling project, the auxiliary device provided by the invention can ensure the continuous circulation of drilling fluid, and more importantly, the drill column stalling time can be greatly shortened, the risk of sticking and sticking the drill column which possibly occurs when the upright column is connected is effectively avoided, the drilling efficiency is improved, and the drilling cost is reduced. Particularly, when drilling deep stratum or high-viscosity stratum, in the process of stopping drilling and connecting the stand column, if only continuous circulation of drilling fluid is ensured, the underground drill string is easy to adhere to the well wall to form adhesion sticking, so that the drill string can be effectively prevented from adhering to the well wall by the aid of the auxiliary device provided by the invention to form adhesion sticking. In other words, just because the prior art does not have auxiliary devices, and in the preparation process of connecting the stand column, the high-pressure hose is always connected to the lateral valve of the circulation short section, so that the circulation short section cannot rotate, and the drill stem must be stopped in the process of connecting the stand column, which is also the main reason of causing the problem of drill sticking. According to the analysis, the auxiliary device is arranged on the short section, so that the drilling fluid can flow into the circulation short section through the auxiliary device when the upright column is connected, namely, a high-pressure hose is not required to be arranged at a side valve of the circulation short section all the time, the problem that the circulation short section connected to the underground upright column stops for a long time due to the limitation of the high-pressure hose is solved, and the problem of drill sticking caused by the long-time stop of a drill column is solved.
Further, with reference to fig. 4, the auxiliary device includes a pressure bearing 30 and a positioning bearing 40, the pressure bearing 30 is sleeved on the middle portion of the hollow shaft body 20, and the positioning bearing 40 is sleeved on the end portion of the hollow shaft body 20, so that the hollow shaft body 20 can rotate relative to the housing 10 through the pressure bearing 30 and the positioning bearing 40, and the pressure bearing 30 and the positioning bearing 40 can perform the functions of pressure bearing and positioning. Specifically, the pressure bearing 30 may be a thrust ball bearing, and the positioning bearing 40 may be a ball bearing. In addition, it should be noted that the end portions herein refer to portions other than the "middle portion".
In order to make the structure of the auxiliary device more stable and compact, the positioning bearing 40 preferably includes a first positioning bearing 41 and a second positioning bearing 42 respectively located at both sides of the pressure bearing 30. For further positioning, a first positioning sleeve 51 is arranged between the first positioning bearing 41 and the first end of the housing 10 in the axial direction, and a second positioning sleeve 52 is arranged between the second positioning bearing 42 and the second end of the housing 10 in the axial direction. In addition, the first positioning bearing 41 and the second positioning bearing 42 may be further positioned by the snap spring.
Further, for convenience of installation and detachment, it is preferable that the housing 10 includes a body 12 and a first cover 13 and a second cover 14 detachably connected to both ends of the body 12 (for example, the detachable connection here may be realized by a fastener such as a bolt), the interface 11 is disposed on the first cover, and the hollow shaft 20 is capable of rotating relative to the first cover 13 and the second cover 14.
In order to facilitate connection of the drilling fluid supply assembly in use (it is usually necessary that a high-pressure hose is connected to the interface 11 of the auxiliary device, and then the high-pressure hose is connected to the drilling fluid supply assembly), an elbow 15 connected to the interface 11 is disposed at the interface 11 (at this time, drilling fluid enters through an inlet of the elbow 15, passes through the interface 11, and then enters the hollow shaft body 20 in use), and the elbow 15 and the first cover body 13 are integrally formed, so that the structure is simpler and more compact.
In addition, since the pipe of the elbow, the interface 11 and the hollow part of the hollow shaft body 20 need to form a circulation channel of the drilling fluid together, in order to avoid leakage of the drilling fluid while ensuring rotation of the hollow shaft body 20, it is preferable that the hollow shaft body 20 is dynamically sealed with the first cover body 13 and the second cover body 14, respectively. Specifically, a plurality of first seal rings 61 (e.g., V-shaped seal rings) may be respectively disposed between the upper end of the hollow shaft body 20 and the first cover 13 while the sealing is reinforced by the first rubber oil seal 62, and similarly, a plurality of second seal rings 63 (e.g., V-shaped seal rings) may be respectively disposed between the lower end of the hollow shaft body 20 and the second cover 14 while the sealing is reinforced by the second rubber oil seal 64. Further, the first rubber oil seal 62 and the second rubber oil seal 64 may be fixed by a first circlip 65 and a second circlip 66.
In addition, in order to enable smooth rotation of the hollow shaft body 20, one end of the hollow shaft body 20 is aligned with and spaced apart from the interface 11, thereby preventing rotational friction between the hollow shaft body 20 and the first cover 13 from affecting rotation of the hollow shaft body 20.
For a further understanding of the present invention, the entire operation of the continuous circulation drilling system provided by the present invention (mainly including the joint column operation process) will be described in detail below with reference to the accompanying drawings:
s1: in the initial state, when the continuous circulation drilling system normally works, a circulation short section 200 is connected above a drill rod, a water tap and other parts for providing drilling fluid are connected above the circulation short section 200, the water tap and the circulation short section are hung above a position to be drilled through a hook assembly 300, and after the preparation work is finished, a drilling tool drills;
s2: when the upright column needs to be connected after a period of drilling, the drilling needs to be stopped firstly, then the circulation short section 200 is disconnected with a water faucet, then the circulation short section is fixed on a rotary table of the drilling machine by clamps such as slips, and a high-pressure hose is connected to a lateral valve 220 of the circulation short section; of course, the other end of the high-pressure hose is connected with a drilling fluid supply device;
s3: stopping the main circulation, namely stopping pumping the drilling fluid from the central valve 210 of the circulation nipple 200, and simultaneously starting the pump, so that the drilling fluid is pumped from the lateral valve 220 of the circulation nipple 200 through the high-pressure hose, namely opening the lateral circulation; wherein the step is to maintain continuous circulation of the drilling fluid;
s4: the part of the hollow shaft body 20 of the auxiliary device, which penetrates out of the shell, is in threaded connection with a circulating short section connected to a drilling tool, and a high-pressure hose of a drilling fluid supply assembly is connected to the interface of the auxiliary device;
s5: starting a pump to pump the drilling fluid from the interface 11 of the auxiliary device, stopping pumping the drilling fluid from the lateral valve 220 of the circulation nipple 200, detaching a high-pressure hose on the lateral valve after the circulation of the drilling fluid is stable, and then starting a rotary table to enable a drill string (positioned underground) connected to the circulation nipple to rotate again; therefore, the rotation stopping time of the drill string is shortened, and the problem of drill jamming caused by long drill string rotation stopping time is avoided;
s6: after the preparation work of the upright column is finished (specifically, after the connection of a drill string connected with a new circulation short section is finished below a water tap below a lifting hook), stopping the rotation of the rotary table again, then connecting a high-pressure hose again at a lateral valve of the circulation short section, stopping pumping the drilling fluid into an interface of the auxiliary device, and simultaneously starting the pump to ensure that the drilling fluid is pumped from the lateral valve of the circulation short section again, namely, opening the lateral circulation again; wherein this step is also intended to maintain continuous circulation of the drilling fluid;
s7: detaching the high-pressure hose from the interface of the auxiliary device, and detaching the auxiliary device from the circulating short section;
s8: connecting a prepared new stand column hung on a lifting hook with the circulation short section, then starting a pump, pumping drilling fluid into a main circulation channel of the circulation short section (namely pumping the drilling fluid from a central valve), and stopping pumping the drilling fluid to the lateral valves;
s9: and after the drilling fluid is circulated and stabilized, disassembling the high-pressure hose at the lateral valve of the lower circulation nipple, starting the turntable, and driving the circulation nipple to continue drilling.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, numerous simple modifications can be made to the technical solution of the invention, including combinations of the individual specific technical features in any suitable way. The invention is not described in detail in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.
Claims (11)
1. An auxiliary device, characterized in that the auxiliary device is used for a continuous circulation drilling system, the auxiliary device comprises a housing (10) and a drilling fluid supply assembly, a port (11) for connecting with the drilling fluid supply assembly is arranged at a first end of the housing (10), a hollow shaft body (20) is rotatably arranged in the housing (10), the hollow part of the hollow shaft body (20) is communicated with the port (11) and penetrates out from a second end of the housing, and a connecting part (21) for connecting with a circulation nipple of the continuous circulation drilling system is arranged at the part of the hollow shaft body (20) penetrating out of the housing (10).
2. Auxiliary device according to claim 1, characterized in that it comprises a bearing (30) and a positioning bearing (40), said bearing (30) being fitted over the middle of said hollow shaft body (20), said positioning bearing (40) being fitted over the end of said hollow shaft body (20).
3. Auxiliary device according to claim 2, characterized in that said positioning bearing (40) comprises a first positioning bearing (41) and a second positioning bearing (42) respectively located on either side of said bearing (30).
4. Auxiliary device according to claim 3, characterized in that a first positioning sleeve (51) is arranged in axial direction between the first positioning bearing (41) and the first end of the housing (10), and a second positioning sleeve (52) is arranged in axial direction between the second positioning bearing (42) and the second end of the housing (10).
5. Auxiliary device according to claim 1, characterized in that said housing (10) comprises a body (12) and a first cover (13) and a second cover (14) removably connected at the two ends of said body (12), said interface (11) being arranged on said first cover, said hollow shaft (20) being able to rotate with respect to said first cover (13) and said second cover (14).
6. Auxiliary device according to claim 5, characterized in that at said interface (11) there is provided an elbow (15) connected to said interface (11), said elbow (15) being integral with said first cover (13).
7. Auxiliary device according to claim 5, characterized in that said hollow shaft body (20) is kinematically sealed with said first (13) and second (14) covers, respectively.
8. Auxiliary device according to claim 1, characterized in that said connection portion (21) is an internal or external thread; and/or the centre line of the hollow shaft body (20) is collinear with the centre line of the housing (10).
9. The assistance device according to claim 1, characterized in that an end of the hollow shaft body (20) close to the interface (11) is aligned with and spaced apart from the interface (11).
10. A continuous circulation drilling system, characterized in that it comprises a drilling tool, a circulation sub (200) connected to the drilling tool, and the auxiliary device of any of claims 1-9, the part of the hollow shaft body (20) that protrudes out of the housing (10) being connectable to the circulation sub (200) via the connection (21).
11. A method of drilling for use in the continuous circulation drilling system of claim 10, the method comprising the steps of:
when the vertical column is connected, stopping drilling, and pumping drilling fluid from a lateral valve (220) of the circulation short section (200), and simultaneously stopping pumping drilling fluid from a central valve (210) of the circulation short section (200);
connecting the part of the hollow shaft body (20) which penetrates out of the shell (10) with the circulation short section (200) through the connecting part (21), and pumping drilling fluid from the interface (11) of the auxiliary device, and simultaneously stopping pumping the drilling fluid from the lateral valve (220) of the circulation short section (200);
the circulation short section is rotated, after the preparation work of the connected upright column is finished, the circulation short section (200) stops rotating, the pumping of the drilling fluid into the interface (11) is stopped, and the drilling fluid is pumped from the lateral valve (220) of the circulation short section (200) again;
detaching the connection between the hollow shaft body (20) and the circulation short section, connecting a prepared new upright column with the circulation short section (200), and then stopping pumping the drilling fluid into the lateral valve (220) of the circulation short section (200) and simultaneously pumping the drilling fluid into the central valve (210) of the circulation short section (200) again;
and (3) rotating the circulating short joint (200) again to continue drilling work.
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| CN201810517046.9A CN108756787B (en) | 2018-05-25 | 2018-05-25 | Auxiliary device, continuous circulation drilling system and drilling method thereof |
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| CN201810517046.9A CN108756787B (en) | 2018-05-25 | 2018-05-25 | Auxiliary device, continuous circulation drilling system and drilling method thereof |
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| CN108756787B true CN108756787B (en) | 2020-06-19 |
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| CN102803643A (en) * | 2010-01-26 | 2012-11-28 | 西部钻探产品有限公司 | Device and method for drilling with continous tool rotation and continous drilling fluid supply |
| CN102828711A (en) * | 2011-09-30 | 2012-12-19 | 南通新诚电子有限公司 | Oil extraction circulation well drilling system |
| CN104153733A (en) * | 2014-07-22 | 2014-11-19 | 中国石油集团渤海钻探工程有限公司 | Continuous circulating drilling system |
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| EP3033481A4 (en) * | 2013-11-21 | 2017-04-05 | Halliburton Energy Services, Inc. | Pressure and flow control in continuous flow drilling operations |
| US10508509B2 (en) * | 2015-12-08 | 2019-12-17 | Schlumberger Technology Corporation | Devices for continuous mud-circulation drilling systems |
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|---|---|---|---|---|
| CN102803643A (en) * | 2010-01-26 | 2012-11-28 | 西部钻探产品有限公司 | Device and method for drilling with continous tool rotation and continous drilling fluid supply |
| CN102828711A (en) * | 2011-09-30 | 2012-12-19 | 南通新诚电子有限公司 | Oil extraction circulation well drilling system |
| CN104632110A (en) * | 2013-11-14 | 2015-05-20 | 中国石油集团川庆钻探工程有限公司 | Continuous circulation drilling technology suitable for gas-liquid two-phase flow drilling |
| CN104153733A (en) * | 2014-07-22 | 2014-11-19 | 中国石油集团渤海钻探工程有限公司 | Continuous circulating drilling system |
| CN104295237A (en) * | 2014-08-13 | 2015-01-21 | 中国石油集团渤海钻探工程有限公司 | Continuous gas lift liquid drain system and method in gas drilling process |
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Effective date of registration: 20230720 Address after: 266580 No. 66 Changjiang West Road, Huangdao District, Qingdao, Shandong. Patentee after: CHINA University OF PETROLEUM (EAST CHINA) Patentee after: SHENZHEN FAR EAST OIL DRILLING ENGINEERING Co.,Ltd. Patentee after: CNOOC RESEARCH INSTITUTE Co.,Ltd. Address before: 266580 No. 66 Changjiang West Road, Huangdao District, Qingdao, Shandong. Patentee before: CHINA University OF PETROLEUM (EAST CHINA) |