CN113417573A - Experimental device and method for evaluating stratum adaptability of static pushing type rotary guide wing rib - Google Patents
Experimental device and method for evaluating stratum adaptability of static pushing type rotary guide wing rib Download PDFInfo
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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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
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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
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Abstract
The invention provides an experimental device for evaluating stratum adaptability of a static pushing type rotary guide wing rib, which comprises a rock core fixing device, a rotary guide drilling simulation tool, a circumferential pressurizing device and an axial pressurizing device, wherein the rock core fixing device is arranged on the rock core fixing device; the core fixing device is used for fixing a core, the rotary steering drilling simulation tool is arranged inside the core, a plurality of guide wing ribs are arranged on the shell, a circumferential pressurizing device is arranged inside the shell, the top of the core fixing device is in contact with the axial pressurizing device, and the circumferential pressurizing device and the axial pressurizing device are both connected with the servo hydraulic control system. The invention also provides an experimental method for evaluating the stratum adaptability of the static push-pull type rotary guide wing rib, the displacement and the pressure value of the guide wing rib are obtained by simulating the working condition of the guide wing rib in the drilling process of the rotary guide drilling tool, the stratum adaptability of the guide wing rib is evaluated, the accuracy of the experimental result is high, and the selection of the guide wing rib suitable for the on-site stratum is facilitated to guide the improvement of the structure of the guide wing rib.
Description
Technical Field
The invention relates to the field of petroleum drilling engineering, in particular to an experimental device and method for evaluating stratum adaptability of a static pushing type rotary guide wing rib.
Background
The rotary steering drilling technology is a top-end automatic drilling technology developed at the end of the 20 th century, and can complete the steering function in real time while drilling in the rotary drilling process of a drill string. The rotary steering drilling technology completely breaks away a sliding steering mode, automatically and flexibly adjusts well deviation and direction in a rotary steering drilling mode, greatly improves drilling speed and safety, has very high track control precision, and is completely suitable for the steering drilling requirements of special process wells such as ultra-deep wells, high-difficulty directional wells, horizontal wells, extended reach wells and the like for developing special oil reservoirs.
International representative rotary steerable drilling systems are Auto Trak RCLS by Baker Hughes, Power Drive SRD by Schlumberger, and Geo-Pilot by Halliburton, respectively. The core of the rotary steering drilling system is a downhole rotary steering tool which can be divided into 3 types of push type, directional type and push-directional composite type according to the steering mode. The working mechanism of the drilling machine is that a biasing mechanism is used for biasing a drill bit or a drill string to generate steering respectively, the pushing type is used for directly providing lateral force for the drill bit near the drill bit, and the pointing type is used for enabling the drill bit to point to a borehole trajectory control direction through the bending of the drill string at the position close to the drill bit. The working mode of the biasing mechanism can be divided into 2 types of static biasing and dynamic (or modulation) biasing, wherein the static biasing means that the guide mechanism does not rotate together with the drill string in the drilling process and stably provides lateral force in a certain fixed direction; dynamic biasing means that the biasing guide mechanism rotates with the drill string during drilling and the control system causes it to pay out at a certain position to provide the guiding force.
Currently, the static push-against type rotary steerable drilling tool has many problems in practical field application, the most prominent of which are the downhole complications caused by the contact of the steering ribs with the well wall and the influence of formation factors on the steering tool. Firstly, there is frictional resistance between the direction rib and the wall of a well, causes the drilling difficulty, and the chamfer of rib still can consume most weight on bit for weight on bit transmission efficiency reduces, and the drill bit can't normally broken rock. Moreover, when the drill encounters a softer stratum, the guide wing ribs can be sunk into the stratum under the action of the guide force, so that the centers of the guide wing ribs deviate from the center of a well hole, the difficulty of regulating and controlling the track of the well hole is increased, and the self-locking phenomenon of a guide tool and the yield damage of the well wall are caused; when the static push type rotary steering drilling tool is applied to the places such as the gulf of Mexico, the offshore karmeuron, the south Norway of Norway, the gulf of Thailand and the like abroad, the problems of insufficient over-steering tool build-up rate, poor steering control and the like occur in softer strata.
For years, Baker Hughes corporation has developed a horizontal push type rotary steering drilling tool, and the novel tool adopts a horizontal push type double-piston design, so that the contact area between a steering wing rib and the well wall is larger, and the deflecting capability is higher. The companies such as Chongqing drilling and the like in China also develop a horizontal pushing type rotary steering drilling tool, but the research on the stratum adaptability of the static pushing type rotary steering drilling tool is less, the cognition on the stratum adaptability of the static pushing type rotary steering drilling tool is lacked, the inclined pushing type and horizontal pushing type tools applicable to different stratums are fuzzy, and a clear tool improvement scheme is lacked. Therefore, it is necessary to provide an experimental apparatus and method for evaluating the formation adaptability of a static thrust type rotary guide rib, which are used for studying the formation adaptability of a rotary guide tool guide rib and guiding the improvement of the guide rib structure.
Disclosure of Invention
The invention provides an experimental device and method for evaluating stratum adaptability of static pushing type rotary guide wing ribs, aiming at the problems, provides powerful guarantee for selection of the guide wing ribs in the static pushing type rotary guide tool, and has extremely high popularization and use values.
In order to achieve the purpose, the invention adopts the following technical scheme:
an experimental device for evaluating stratum adaptability of a static pushing type rotary guide wing rib is characterized by comprising a rock core fixing device, a rotary guide drilling simulation tool, a circumferential pressurizing device and an axial pressurizing device;
the rock core fixing device is arranged on the base plate and comprises a pair of buttresses and a rock core fixing sleeve, the buttresses are symmetrically arranged on two sides of the rock core fixing sleeve, and a rock core placing hole is formed in the top surface of the rock core fixing sleeve and used for fixing a rock core;
the rotary steering drilling simulation tool is arranged in the rock core and comprises a shell and a steering wing rib, wherein a plurality of wing rib installation grooves are formed in the surface of the shell at equal intervals along the circumferential direction, and the steering wing rib is arranged in each wing rib installation groove;
the circumferential pressurizing device is arranged in the rotary steering drilling simulation tool and comprises a circumferential servo hydraulic oil cylinder and a circumferential sensor, a hydraulic plunger is arranged at the position, corresponding to each wing rib mounting groove, of the pressurizing end of the circumferential servo hydraulic oil cylinder, a circumferential sensor is arranged at the top end of the hydraulic plunger, and the circumferential sensor is in contact with the guide wing ribs;
the axial pressurizing device is fixed at a position above the rotary steering drilling simulation tool through a support, is positioned on the same straight line with the rotary steering drilling simulation tool and comprises an axial servo hydraulic oil cylinder and an axial sensor, and the axial sensor is arranged at a pressurizing end of the axial servo hydraulic oil cylinder and is contacted with the top end of the rotary steering drilling simulation tool;
the circumferential servo hydraulic oil cylinder, the circumferential sensor, the axial servo hydraulic oil cylinder and the axial sensor are all connected with the servo hydraulic control system, the circumferential sensor comprises a circumferential force measuring sensor and a circumferential displacement sensor, and the axial sensor comprises an axial force measuring sensor and an axial displacement sensor.
Preferably, the core fixing sleeve is made of 304 stainless steel or 45# steel, and the inclination angles of the base plate and the bracket can be adjusted.
Preferably, the core is of a hollow cylinder structure, the hollow part in the core is used for placing a rotary steering drilling simulation tool, and the inner wall of the core is used for simulating a well wall.
Preferably, the rotary steerable drilling simulation tool and the actual rotary steerable drilling tool have the same working part size, the guide wing ribs are inclined push type guide wing ribs or horizontal push type guide wing ribs, the interior of the guide wing ribs is provided with a return spring, and the guide wing ribs can be detached and replaced.
Preferably, the rotary steerable drilling simulation tool is provided with three steering ribs.
Preferably, the circumferential displacement sensor and the axial displacement sensor are both non-contact magnetostrictive displacement sensors.
An experimental method for evaluating stratum adaptability of a static pushing type rotary guide wing rib adopts the experimental device, and specifically comprises the following steps:
step 1, placing a core in a core fixing sleeve, and fixing the core fixing sleeve on a base plate by using a backer;
step 2, installing guide wing ribs in wing rib installation grooves of a shell of the rotary steering drilling simulation tool, checking the flexibility of the guide wing ribs, placing a circumferential servo hydraulic oil cylinder in the rotary steering drilling simulation tool, and checking the flexibility of the circumferential servo hydraulic oil cylinder;
step 3, placing the rotary steering drilling simulation tool in the rock core, checking the flexibility of the axial servo hydraulic oil cylinder, adjusting the position of the axial servo hydraulic oil cylinder, and fixing the axial servo hydraulic oil cylinder above the rotary steering drilling simulation tool so that the axial servo hydraulic oil cylinder and the rotary steering drilling simulation tool are positioned on the same straight line;
step 8, keeping the hydraulic pressure values of the axial servo hydraulic oil cylinder and the circumferential servo hydraulic oil cylinder constant, changing the loading speeds of the axial servo hydraulic oil cylinder and the circumferential servo hydraulic oil cylinder by using a servo hydraulic control system, repeating the steps 4 to 6 to obtain displacement and stress values of the rotary steering drilling simulation tool in the circumferential direction and the axial direction under the condition of different loading speeds, and determining the change rule of the guide rib core indentation depth along with the loading speed;
and 9, keeping the hydraulic pressure values and the loading speeds of the axial servo hydraulic oil cylinder and the circumferential servo hydraulic oil cylinder constant, repeating the steps 4 to 6 to obtain the displacement and the stress values of the rotary steering drilling simulation tool in the circumferential direction and the axial direction at different time, and determining the change rule of the guide wing rib core indentation depth along with time.
Preferably, a plurality of rock cores with different rock mechanical parameters are selected, the steps 1 to 6 are repeated respectively, and the influence of each rock mechanical parameter on the indentation depth of the guide wing rib rock core is determined according to the indentation depth of the rock core of the rotary guide wing rib under each rock mechanical parameter condition.
Preferably, the rock mechanics parameters include elastic modulus, compressive strength and poisson's ratio.
The invention has the following beneficial technical effects:
1. the invention provides an experimental device for evaluating stratum adaptability of a static push-pull type rotary guide wing rib, which truly simulates the working state of a static push-pull type rotary guide tool in the actual drilling process, converts the complicated field rotary drilling process into an indoor experiment, realizes the simulation of the working condition of the guide wing rib under the conditions of a horizontal well section and an inclined well section, and has the advantages of high experimental result accuracy, low manufacturing cost of the experimental device, convenience in mounting and dismounting and strong operability.
2. The invention provides an experimental method for evaluating stratum adaptability of a static push-type rotary guide wing rib, which utilizes a servo hydraulic control system to control an axial servo hydraulic oil cylinder and a circumferential servo hydraulic oil cylinder, researches the influence of drilling parameters on the working state of the guide wing rib by changing the drilling parameters of a rotary guide drilling simulation tool, and simultaneously researches the influence of different rock mechanical parameters on the working state of the guide wing rib by replacing a rock core, thereby being beneficial to determining the influence of various research factors on the guide wing rib of the rotary guide drilling tool.
3. In the experimental device provided by the invention, the guide wing ribs of the rotary steering drilling simulation tool can be detached and replaced by different types of guide wing ribs for experiment, and the experimental method provided by the invention is combined, so that the influence of each influence factor on the guide wing ribs of the static push type rotary steering drilling tool can be comprehensively researched, the adaptability of the guide wing ribs to different stratums is determined through experiments, the simulation of a real drilling process is realized, and the selection of the proper guide wing ribs for the rotary steering drilling tool according to real stratum conditions is facilitated.
Drawings
FIG. 1 is a schematic view of an experimental apparatus according to the present invention.
Fig. 2 is a schematic diagram of a core fixing device in the experimental apparatus of the present invention.
FIG. 3 is a schematic diagram of a housing of a rotary steerable drilling simulation tool in an experimental apparatus of the present invention.
FIG. 4 is a schematic view of a circumferential pressurizing device in the experimental apparatus of the present invention; fig. 4(a) is a schematic diagram of a pressing end of the circumferential servo hydraulic cylinder, and fig. 4(b) is a schematic diagram of the circumferential servo hydraulic cylinder.
FIG. 5 is a schematic view of an axial pressurizing device in the experimental apparatus of the present invention.
FIG. 6 is a schematic view of a guide rib in the experimental setup of the present invention; fig. 6(a) is a schematic structural view of the slant-pushing type guide rib, and fig. 6(b) is a schematic structural view of the horizontal-pushing type guide rib.
FIG. 7 is a schematic view of the working principle of the guide rib in the experimental apparatus of the present invention; fig. 7(a) is a schematic view showing an operation principle of the slant-pushing type guide rib, and fig. 7(b) is a schematic view showing an operation principle of the horizontal-pushing type guide rib.
In the figure, 1, a rock core fixing device, 1.1, a rock core placing hole, 1.2, a rock core, 1.3, a rock core fixing sleeve, 1.4, a backer, 2, a rotary guide drilling simulation tool, 2.1, a shell, 2.2, a rib mounting groove, 2.3, a guide rib, 2.4, an inclined push type guide rib, 2.5, a horizontal push type guide rib, 2.6, a reset spring, 3, a circumferential pressurizing device, 3.1, a circumferential servo hydraulic oil cylinder, 3.2, a hydraulic plunger, 4, an axial servo hydraulic oil cylinder, 5, a servo hydraulic control system, 6, a support, 7 and a base plate.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
The invention discloses an experimental device for evaluating stratum adaptability of a static pushing type rotary guide wing rib, which comprises a rock core fixing device 1, a rotary guide drilling simulation tool 2, a circumferential pressurizing device 3 and an axial pressurizing device as shown in figure 1.
The core fixing device 1 is arranged on the base plate 7, and the base plate 7 is in direct contact with the bottom surface of the core fixing device 1, so that the load applied to the core fixing device 1 can be borne, and the influence of the external environment is avoided in the experiment process; as shown in fig. 2, the core fixing device 1 comprises a pair of buttresses 1.4 and a core fixing sleeve 1.3, wherein the buttresses 1.4 are symmetrically arranged on two sides of the core fixing sleeve 1.3 and used for fixing the core fixing sleeve 1.3 on a base plate 7 and preventing the core fixing sleeve 1.3 from moving in the experimental process; the top surface of the core fixing sleeve 1.3 is provided with a core placing hole 1.1 for fixing the core 1.2, the core 1.2 is placed in the core placing hole 1.1 and is of a hollow cylindrical structure, and the inner wall is used for simulating a well wall.
The rotary steerable drilling simulation tool 2 is arranged in the hollow part of the core 1.2 and comprises a shell 2.1 and a steering wing rib 2.3, the size of the shell 2.1 is the same as that of the shell of the working part of the actual rotary steerable drilling tool, in the embodiment, three wing rib installation grooves 2.2 are arranged on the surface of the shell 2.1 at equal intervals along the circumferential direction, as shown in fig. 3, detachable steering wing ribs 2.3 are installed in the three wing rib installation grooves 2.2, and as shown in fig. 6, the steering wing ribs 2.3 can be selected from a slant push type rotary steerable wing rib 2.4 or a flat push type rotary steerable wing rib 2.5; as shown in fig. 7, when pressure is applied to the return spring 2.6, the return spring 2.6 is compressed, the support guide rib 2.3 is pushed out from the rib mounting groove 2.2, and the guide rib 2.3 is tightly attached to the inner wall of the rock core 1.2, so that the working state of the guide rib 2.3 in the actual drilling process is simulated; when the pressure is stopped to be applied to the reset spring 2.6, the reset spring 2.6 is restored to the original state, and the guide wing rib 2.3 retracts into the wing rib installation groove 2.2, so that the extension and retraction of the guide wing rib 2.3 can be controlled by adjusting the pressure applied by the reset spring 2.6, and the working state of the guide wing rib 2.3 in the actual drilling process is simulated.
The rotary guide drilling simulation tool 2 is internally provided with a circumferential pressurizing device 3, as shown in fig. 4, the circumferential pressurizing device 3 comprises a circumferential servo hydraulic oil cylinder 3.1 and a circumferential sensor, a plurality of hydraulic plungers 3.2 are arranged at a pressure applying end of the circumferential servo hydraulic oil cylinder 3.1 and used for pushing the guide wing ribs 2.3 to cling to the inner wall of the core 1.2, the number of the hydraulic plungers 3.2 is the same as that of the guide wing ribs 2.3, the hydraulic plungers 3.2 are distributed at equal intervals and are arranged at positions opposite to the wing rib mounting grooves 2.2, the top ends of the hydraulic plungers 3.2 are provided with the circumferential sensor, the circumferential sensor is in contact with the guide wing ribs 2.3 and used for measuring displacement and stress values of the guide wing ribs 2.3 in the horizontal direction in the experiment process, and determining the pressure applied by the guide wing ribs 2.3 and the depth of the guide wing ribs 2.3 pressed into the core 1.2 in the drilling process.
The axial pressurizing device is fixed at a position above the rotary steering drilling simulation tool 2 through the support 6 and is positioned on the same straight line with the rotary steering drilling simulation tool 2, and the inclination angles of the base plate 7 and the support 6 can be adjusted, so that the inclination angles of the axial pressurizing device and the core fixing device 1 are adjusted and are used for simulating a horizontal well section and an inclined well section with different angles; the axial sensor is arranged at the pressure applying end of the axial servo hydraulic oil cylinder 4, is in contact with the top end of the rotary steering drilling simulation tool 2 and is used for measuring the displacement and the stress value of the rotary steering drilling simulation tool 2 in the vertical direction in the experimental process, the stress value in the vertical direction is equivalent to the bit pressure of the rotary steering drilling tool in the actual drilling process, and the displacement is equivalent to the footage of the rotary steering drilling tool in the actual drilling process.
The circumferential servo hydraulic oil cylinder 3.1, the circumferential sensor, the axial servo hydraulic oil cylinder 4 and the axial sensor are connected with a servo hydraulic control system 5, the servo hydraulic control system 5 can control the hydraulic pressure value, the loading speed and the loading time of the circumferential servo hydraulic oil cylinder 3.1 and the axial servo hydraulic oil cylinder 4, can control the circumferential sensor and the axial sensor, acquire and store the measurement data of the circumferential sensor and the axial sensor, and the servo hydraulic control system 5 can realize the independent control of the circumferential servo hydraulic oil cylinder 3.1 and the axial servo hydraulic oil cylinder 4, so that the two hydraulic oil cylinders are not influenced by each other; the circumferential sensor comprises a circumferential force measuring sensor and a circumferential displacement sensor, the circumferential force measuring sensor is used for measuring a circumferential hydraulic pressure value of the guide wing rib 2.3, namely the circumferential force application size of the guide wing rib 2.3 is obtained, and the circumferential displacement sensor is used for measuring the extension length of the guide wing rib 2.3, namely the depth of the guide wing rib 2.3 pressed into the core 1.2 is determined; the axial sensor comprises an axial force transducer and an axial displacement sensor, the axial force transducer is used for measuring the axial hydraulic pressure value borne by the rotary steering drilling simulation tool 2 and acquiring the bit pressure value borne by the rotary steering drilling simulation tool 2, and the axial displacement sensor is used for measuring the axial displacement of the rotary steering drilling simulation tool 2 and acquiring the actual footage of the rotary steering drilling simulation tool 2; the circumferential displacement sensor and the axial displacement sensor are non-contact magnetostrictive displacement sensors, so that the measuring environment is not easily influenced, and the measuring result is accurate.
Meanwhile, the experimental device disclosed by the invention adopts the combination of the axial pressurizing device and the support 6, is flexible in mechanical design, and can be placed horizontally or vertically, so that the device can be used for simulating the drilling process of the rotary steering drilling tool in an inclined well section and the drilling process of the rotary steering drilling tool in a horizontal well section, and is favorable for comprehensively evaluating the stratum adaptability of the steering wing ribs 2.3.
The invention also provides an experimental method for evaluating the stratum adaptability of the static pushing type rotary guide wing rib, and the experimental device for evaluating the stratum adaptability of the static pushing type rotary guide wing rib specifically comprises the following steps:
step 1, placing a core 1.2 in a core fixing sleeve 1.3, and fixing the core fixing sleeve 1.3 on a base plate 7 by utilizing a backer 1.4 to prevent the core fixing sleeve 1.3 from moving in the experimental process.
And 2, installing guide wing ribs 2.3 in wing rib installation grooves 2.2 of a shell 2.1 of the rotary guide drilling simulation tool 2, checking the guide wing ribs 2.3 to ensure the flexibility of the guide wing ribs 2.3, then placing a circumferential servo hydraulic oil cylinder 3.1 in the rotary guide drilling simulation tool 2, checking the circumferential servo hydraulic oil cylinder 3.1 to ensure the flexibility of the circumferential servo hydraulic oil cylinder 3.1.
And 3, placing the rotary steering drilling simulation tool 2 in the rock core 1.2, checking the axial servo hydraulic oil cylinder 4, ensuring the flexibility of the axial servo hydraulic oil cylinder 4, adjusting the position of the axial servo hydraulic oil cylinder 4, and fixing the axial servo hydraulic oil cylinder 4 right above the rotary steering drilling simulation tool 2 so that the axial sensor is in contact with the rotary steering drilling simulation tool 2.
And 4, controlling the hydraulic pressure value of the circumferential servo hydraulic oil cylinder 3.1 by using the servo hydraulic control system 5, applying a circumferential hydraulic pressure to the guide wing rib 2.3 of the rotary guide drilling simulation tool 2 by using the circumferential servo hydraulic oil cylinder 3.1, enabling the guide wing rib 2.3 to be attached to the inner wall of the rock core 1.2, simulating the working state of the guide wing rib 2.3, and keeping the hydraulic pressure value of the circumferential servo hydraulic oil cylinder 3.1 constant.
And 5, controlling the hydraulic pressure value of the axial servo hydraulic oil cylinder 4 by using the servo hydraulic control system 5, applying an axial hydraulic pressure force to the rotary steering drilling simulation tool 2 by using the axial servo hydraulic oil cylinder 4, pushing the rotary steering drilling simulation tool 2 to move in the vertical direction at a constant speed, and simulating the drilling process of the rotary steering drilling tool.
And 6, measuring the displacement and the stress value of the rotary steering drilling simulation tool 2 in the vertical direction by using the axial sensor, measuring the displacement and the stress value of the rotary steering drilling simulation tool 2 in the horizontal direction by using the circumferential sensor, and determining the core pressing depth of the guide wing rib 2.3.
And 7, changing the hydraulic pressure values of the axial servo hydraulic oil cylinder 4 and the circumferential servo hydraulic oil cylinder 3.1 by using the servo hydraulic control system 5, repeating the steps 4 to 6 to obtain the displacement and stress values of the rotary steering drilling simulation tool 2 in the horizontal direction and the vertical direction under the condition of different hydraulic pressure values, and determining the change rule of the core indentation depth of the guide wing rib 2.3 along with the hydraulic pressure values.
And 8, keeping the hydraulic pressure values of the axial servo hydraulic oil cylinder 4 and the circumferential servo hydraulic oil cylinder 3.1 constant, changing the loading speeds of the axial servo hydraulic oil cylinder 4 and the circumferential servo hydraulic oil cylinder 3.1 by using the servo hydraulic control system 5, repeating the steps 4 to 6 to obtain the displacement and stress values of the rotary steering drilling simulation tool 2 in the horizontal direction and the vertical direction under the condition of different loading speeds, and determining the change rule of the core pressing depth of the guide wing rib 2.3 along with the loading speed.
And 9, keeping the hydraulic pressure values and the loading speeds of the axial servo hydraulic oil cylinder 4 and the circumferential servo hydraulic oil cylinder 3.1 constant, repeating the steps 4 to 6 to obtain the displacement and the stress values of the rotary steering drilling simulation tool 2 in the horizontal direction and the vertical direction at different time, and determining the change rule of the core pressing depth of the guide wing rib 2.3 along with the time.
By adopting the experimental method for evaluating the stratum adaptability of the static push-pull type rotary guide wing rib, cores with different elastic modulus, compressive strength and Poisson ratio are respectively measured, the steps 1 to 6 are repeated, the depth of the rotary guide drilling simulation tool 2, which is used for guiding the wing rib 2.3 to be pressed into the core 1.2 in each simulated drilling process, is determined, and the influences of the elastic modulus, the compressive strength and the Poisson ratio on the core pressing depth of the guide wing rib 2.3 are respectively determined according to the core pressing depth corresponding to the guide wing rib 2.3 under each rock mechanical parameter condition. In addition, the experimental method for evaluating the stratum adaptability of the static push-pull type rotary guide wing rib can also be used for carrying out simulation experiments aiming at different types of guide wing ribs 2.3 by replacing the guide wing rib 2.3, repeating the steps 1 to 6 to obtain the depth of each type of guide wing rib 2.3 pressed into the rock core 1.2 under the same stratum condition and evaluating the stratum adaptability of the guide wing rib, so that the guide wing rib more suitable for the stratum condition is selected, and the selection of the guide wing rib of a rotary guide drilling tool in the actual rotary guide operation process is guided.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected 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 through specific situations.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (9)
1. An experimental device for evaluating stratum adaptability of a static pushing type rotary guide wing rib is characterized by comprising a rock core fixing device (1), a rotary guide drilling simulation tool (2), a circumferential pressurizing device (3) and an axial pressurizing device;
the rock core fixing device (1) is arranged on the base plate (7) and comprises a pair of buttresses (1.4) and a rock core fixing sleeve (1.3), the buttresses (1.4) are symmetrically arranged on two sides of the rock core fixing sleeve (1.3), and a rock core placing hole (1.1) is formed in the top surface of the rock core fixing sleeve (1.3) and used for fixing a rock core (1.2);
the rotary steering drilling simulation tool (2) is arranged inside a rock core (1.2) and comprises a shell (2.1) and a guide wing rib (2.3), a plurality of wing rib installation grooves (2.2) are formed in the surface of the shell (2.1) at equal intervals along the circumferential direction, and the guide wing rib (2.3) is arranged in each wing rib installation groove (2.2);
the circumferential pressurizing device (3) is arranged inside the rotary steering drilling simulation tool (2) and comprises a circumferential servo hydraulic oil cylinder (3.1) and a circumferential sensor, hydraulic plungers (3.2) are arranged at positions, corresponding to the wing rib mounting grooves (2.2), of a pressing end of the circumferential servo hydraulic oil cylinder (3.1), the circumferential sensor is arranged at the top end of each hydraulic plunger (3.2), and the circumferential sensor is in contact with the guide wing ribs (2.3);
the axial pressurizing device is fixed at the position above the rotary steering drilling simulation tool (2) through a support (6), is positioned on the same straight line with the rotary steering drilling simulation tool (2), and comprises an axial servo hydraulic oil cylinder (4) and an axial sensor, wherein the axial sensor is arranged at the pressurizing end of the axial servo hydraulic oil cylinder (4) and is contacted with the top end of the rotary steering drilling simulation tool (2);
the circumferential servo hydraulic oil cylinder (3.1), the circumferential sensor, the axial servo hydraulic oil cylinder (4) and the axial sensor are all connected with the servo hydraulic control system (5), the circumferential sensor comprises a circumferential force measuring sensor and a circumferential displacement sensor, and the axial sensor comprises an axial force measuring sensor and an axial displacement sensor.
2. The experimental device for evaluating the stratum adaptability of the static pushing type rotary guide wing rib is characterized in that the core fixing sleeve (1.3) is made of 304 stainless steel or 45# steel, and the inclination angles of the base plate (7) and the bracket (6) can be adjusted.
3. The experimental device for evaluating the stratum adaptability of the static push-against type rotary guide wing rib is characterized in that the rock core (1.2) is of a hollow cylinder structure, the hollow part in the interior is used for placing a rotary guide drilling simulation tool (2), and the inner wall of the rock core (1.2) is used for simulating a well wall.
4. The experimental device for evaluating the stratum adaptability of the static push-against type rotary guide rib is characterized in that the rotary guide drilling simulation tool (2) has the same size with the working part of an actual rotary guide drilling tool, the guide rib (2.3) is a slant push type guide rib (2.4) or a horizontal push type guide rib (2.5), a return spring (2.6) is arranged inside the slant push type guide rib (2.4), and the guide rib (2.3) can be detachably replaced.
5. An experimental setup for evaluating the formation suitability of a static push-against rotary guide rib according to claim 4 characterized in that the rotary guide drilling simulation tool (2) is provided with three guide ribs (2.3).
6. The experimental apparatus for evaluating the formation suitability of the static push-against type rotary guide rib according to claim 1, wherein the circumferential displacement sensor and the axial displacement sensor are both non-contact magnetostrictive displacement sensors.
7. An experimental method for evaluating the stratum adaptability of a static push-pull type rotary guide wing rib is characterized in that the experimental device of claim 1 is adopted, and the experimental method specifically comprises the following steps:
step 1, placing a rock core (1.2) in a rock core fixing sleeve (1.3), and fixing the rock core fixing sleeve (1.3) on a base plate (7) by utilizing a back rest (1.4);
step 2, installing guide wing ribs (2.3) in wing rib installation grooves (2.2) of a shell (2.1) of the rotary guide drilling simulation tool (2), checking the flexibility of the guide wing ribs (2.3), placing a circumferential servo hydraulic oil cylinder (3.1) in the rotary guide drilling simulation tool (2), and checking the flexibility of the circumferential servo hydraulic oil cylinder (3.1);
step 3, placing the rotary steering drilling simulation tool (2) in the rock core (1.2), checking the flexibility of the axial servo hydraulic oil cylinder (4), adjusting the position of the axial servo hydraulic oil cylinder (4), and fixing the axial servo hydraulic oil cylinder (4) above the rotary steering drilling simulation tool (2) so that the axial servo hydraulic oil cylinder (4) and the rotary steering drilling simulation tool (2) are positioned on the same straight line;
step 4, controlling a hydraulic pressure value of the circumferential servo hydraulic oil cylinder (3.1) by using a servo hydraulic control system (5), applying a circumferential hydraulic pressure to a guide wing rib (2.3) of the rotary guide drilling simulation tool (2) by the circumferential servo hydraulic oil cylinder (3.1), enabling the guide wing rib (2.3) to be attached to the inner wall of the core (1.2) and keeping the hydraulic pressure value of the circumferential servo hydraulic oil cylinder (3.1) constant;
step 5, controlling a hydraulic pressure value of an axial servo hydraulic oil cylinder (4) by using a servo hydraulic control system (5), applying an axial hydraulic pressure to the rotary steering drilling simulation tool (2) by the axial servo hydraulic oil cylinder (4), and pushing the rotary steering drilling simulation tool (2) to move linearly at a constant speed;
step 6, measuring the displacement and the stress value of the rotary steering drilling simulation tool (2) in the axial direction by using an axial sensor, measuring the displacement and the stress value of the rotary steering drilling simulation tool (2) in the circumferential direction by using a circumferential sensor, and determining the core pressing depth of the guide wing rib (2.3);
step 7, changing the hydraulic pressure values of the axial servo hydraulic oil cylinder (4) and the circumferential servo hydraulic oil cylinder (3.1) by using a servo hydraulic control system (5), repeating the steps 4 to 6 to obtain the displacement and the stress values of the rotary steering drilling simulation tool (2) in the circumferential direction and the axial direction under the condition of different hydraulic pressure values, and determining the change rule of the core indentation depth of the guide wing rib (2.3) along with the hydraulic pressure values;
step 8, keeping the hydraulic pressure values of the axial servo hydraulic oil cylinder (4) and the circumferential servo hydraulic oil cylinder (3.1) constant, changing the loading speeds of the axial servo hydraulic oil cylinder (4) and the circumferential servo hydraulic oil cylinder (3.1) by using a servo hydraulic control system (5), repeating the steps 4 to 6, obtaining the displacement and the stress value of the rotary steering drilling simulation tool (2) in the circumferential direction and the axial direction under the condition of different loading speeds, and determining the change rule of the core indentation depth of the guide wing rib (2.3) along with the loading speed;
and 9, keeping the hydraulic pressure value and the loading speed of the axial servo hydraulic oil cylinder (4) and the circumferential servo hydraulic oil cylinder (3.1) constant, repeating the steps 4 to 6 to obtain the displacement and the stress value of the rotary steering drilling simulation tool (2) in the circumferential direction and the axial direction at different time, and determining the change rule of the indentation depth of the guide wing rib core (2.3) along with the time.
8. The experimental method for evaluating the stratum adaptability of the static push-pull type rotary guide wing rib is characterized in that a plurality of rock cores with different rock mechanical parameters are selected, the steps 1 to 6 are respectively repeated, and the influence of the rock mechanical parameters on the rock core penetration depth of the guide wing rib (2.3) is determined according to the rock core penetration depth of the rotary guide wing rib (2.3) under the condition of the rock mechanical parameters.
9. The experimental method for evaluating the formation suitability of the static push-against type rotary guide rib according to claim 8, wherein the rock mechanical parameters comprise elastic modulus, compressive strength and Poisson's ratio.
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