CN113417573B - Experimental device and method for evaluating stratum adaptability of static pushing type rotary guiding rib - Google Patents
Experimental device and method for evaluating stratum adaptability of static pushing type rotary guiding rib Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 29
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- 238000005553 drilling Methods 0.000 claims abstract description 138
- 238000004088 simulation Methods 0.000 claims abstract description 87
- 238000006073 displacement reaction Methods 0.000 claims abstract description 38
- 238000002474 experimental method Methods 0.000 claims abstract description 14
- 239000011435 rock Substances 0.000 claims description 41
- 238000003825 pressing Methods 0.000 claims description 18
- 239000010720 hydraulic oil Substances 0.000 claims description 13
- 230000008859 change Effects 0.000 claims description 9
- 238000009434 installation Methods 0.000 claims description 3
- 239000010963 304 stainless steel Substances 0.000 claims description 2
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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
- E21B47/00—Survey of boreholes or wells
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Abstract
The invention provides an experimental device for evaluating stratum adaptability of a static push-against type rotary guide rib, which comprises a core fixing device, a rotary guide drilling simulation tool, a circumferential pressurizing device and an axial pressurizing device, wherein the core fixing device is used for fixing a core; the core fixing device is used for fixing the core, the rotary guide drilling simulation tool is arranged inside the core, the shell is provided with a plurality of guide ribs, the circumferential pressurizing device is arranged inside the shell, the top of the core fixing device is contacted with the axial pressurizing device, and the circumferential pressurizing device and the axial pressurizing device are connected with the servo hydraulic control system. The invention also provides an experimental method for evaluating the stratum adaptability of the static pushing 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 experimental result is high in accuracy, the guide wing rib suitable for the field stratum is favorably selected, and the improvement of the structure of the guide wing rib is guided.
Description
Technical Field
The invention relates to the field of petroleum drilling engineering, in particular to an experimental device and method for evaluating the stratum adaptability of a static pushing type rotary guiding rib.
Background
The rotary steering drilling technology is a tip automatic drilling technology developed at the end of the 20 th century, and can complete steering function while drilling in real time in the rotary drilling process of a drill string. The rotary steering drilling technology completely breaks away from the sliding steering mode, automatically and flexibly adjusts well deviation and azimuth in the rotary steering drilling mode, greatly improves the drilling speed and safety, has very high track control precision, and is completely suitable for the requirements of special process well steering drilling such as ultra-deep wells, highly difficult directional wells, horizontal wells, large displacement wells and the like for developing special oil reservoirs.
Internationally representative rotary steerable drilling systems are the Auto Trak RCLS from Baker Hughes, the Power Drive SRD from Schlumberger, and the Geo-Pilot system from Halliburton, respectively. The core of the rotary steering drilling system is a downhole rotary steering tool, and the rotary steering tool can be divided into 3 types of push-against type, directional type and push-against directional type according to a steering mode. The working mechanism is that the drill bit or the drill string is respectively biased by the biasing mechanism to generate guiding, the pushing-against type is to directly provide lateral force for the drill bit near the drill bit, and the guiding type is to lead the drill bit to point to the control direction of the borehole track through the bending of the drill string near 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 refers to that the steering mechanism does not rotate together with a drill string in the drilling process, and lateral force is provided in a certain fixed direction stably; dynamic biasing refers to biasing the steering mechanism to rotate with the drill string during drilling, with the control system causing it to be timed out at a certain position to provide steering force.
At present, static push-against rotary steerable drilling tools present a number of problems in practical field applications, the most prominent of which are the downhole complications of steering ribs in contact with the borehole wall and the effects of formation factors on the steerable tool. Firstly, frictional resistance exists between the guide rib and the well wall, so that drilling is difficult, most of drilling pressure can be consumed by chamfering of the rib, drilling pressure transmission efficiency is reduced, and the drill bit cannot normally crush rock. In addition, when a softer stratum is drilled, the guide rib possibly falls into the stratum under the action of the guide force, so that the center of the guide rib deviates from the center of the well bore, the difficulty of regulating and controlling the track of the well bore is increased, and the self-locking phenomenon of the guide tool and the yielding damage of the well wall are caused; when static push-type rotary steering drilling tools are applied to the places such as the gulf of mexico, the offshore of karst, the south of norway, the gulf of thailand and the like, the problems of insufficient steering tool build rate, poor steering control and the like occur in softer strata.
Over the years, baker Hughes has developed a flat-push rotary steerable drilling tool that uses a flat-push double-piston design to make the contact area between the steering rib and the borehole wall greater, with a higher deflecting capability. Domestic Chuanqing drilling and other companies also develop flat-pushing rotary steerable drilling tools, but the research on the stratum adaptability of the static push rotary steerable drilling tools is less, the cognition on the stratum adaptability of the static push rotary steerable drilling tools is lacking, the inclined push tools and the flat push tools applicable to different strata are fuzzy, and a clear tool improvement scheme is lacking. Therefore, it is necessary to propose an experimental device and a method for evaluating the stratum adaptability of the static push-type rotary guiding rib, researching the stratum adaptability of the rotary guiding tool guiding rib, and guiding the improvement of the guiding rib structure.
Disclosure of Invention
Aiming at the problems, the invention provides an experimental device and a method for evaluating the stratum adaptability of the static pushing type rotary guiding wing rib, which provide powerful guarantee for the selection of the guiding wing rib in the static pushing type rotary guiding tool and have extremely high popularization and use values.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the experimental device for evaluating the stratum adaptability of the static pushing type rotary guiding rib is characterized by comprising a core fixing device, a rotary guiding drilling simulation tool, a circumferential pressurizing device and an axial pressurizing device;
the rock core fixing device is arranged on the backing plate and comprises a pair of backers and a rock core fixing sleeve, wherein the backers 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 steering ribs, wherein a plurality of rib mounting grooves are formed in the surface of the shell at equal intervals along the circumferential direction, and steering ribs are arranged in each rib mounting groove;
the circumferential pressurizing device is arranged in the rotary guide drilling simulation tool and comprises a circumferential servo hydraulic cylinder and a circumferential sensor, hydraulic plungers are arranged at positions, corresponding to all rib mounting grooves, of the pressurizing end of the circumferential servo hydraulic cylinder, the top ends of the hydraulic plungers are provided with the circumferential sensors, and the Zhou Xiangchuan sensors are in contact with the guide ribs;
the axial pressurizing device is fixed at the upper position of the rotary steering drilling simulation tool through a bracket and is positioned on the same line with the rotary steering drilling simulation tool, and the axial pressurizing device comprises an axial servo hydraulic cylinder and an axial sensor, wherein the axial sensor is arranged at the pressurizing end of the axial servo hydraulic cylinder and is contacted with the top end of the rotary steering drilling simulation tool;
the circumferential servo hydraulic cylinder, the circumferential sensor, the axial servo hydraulic cylinder and the axial sensor are all connected with the servo hydraulic control system, the Zhou Xiangchuan sensor comprises a circumferential force transducer and a circumferential displacement sensor, and the axial sensor comprises an axial force transducer 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 backing plate and the bracket are adjustable.
Preferably, the core is in 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 size of the working part of the rotary steering drilling simulation tool is the same as that of the actual rotary steering drilling tool, the steering wing ribs are inclined pushing type steering wing ribs or flat pushing type steering wing ribs, a reset spring is arranged in the rotary steering drilling simulation tool, and the steering 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 noncontact magnetostrictive displacement sensors.
An experimental method for evaluating the stratum adaptability of a static pushing type rotary guiding rib adopts the experimental device, and specifically comprises the following steps:
step 1, placing a rock core in a rock core fixing sleeve, and fixing the rock core fixing sleeve on a backing plate by using a backer;
step 2, installing a guide rib in a rib installation groove of the casing of the rotary guide drilling simulation tool, checking the flexibility of the guide rib, placing a circumferential servo hydraulic cylinder in the rotary guide drilling simulation tool, and checking the flexibility of the circumferential servo hydraulic cylinder;
step 3, placing the rotary steering drilling simulation tool in the rock core, checking the flexibility of the axial servo hydraulic cylinder, adjusting the position of the axial servo hydraulic cylinder, and fixing the axial servo hydraulic cylinder above the rotary steering drilling simulation tool so that the axial servo hydraulic cylinder and the rotary steering drilling simulation tool are positioned on the same straight line;
step 4, controlling the hydraulic pressure value of a circumferential servo hydraulic oil cylinder by using a servo hydraulic control system, and applying circumferential hydraulic pressure to a guide rib of a rotary guide drilling simulation tool by using the circumferential servo hydraulic oil cylinder so that the guide rib is clung to the inner wall of the core, and keeping the hydraulic pressure value of the circumferential servo hydraulic oil cylinder constant;
step 5, controlling the hydraulic pressure value of an axial servo hydraulic oil cylinder by utilizing a servo hydraulic control system, and applying axial hydraulic pressure to the rotary steering drilling simulation tool by the axial servo hydraulic oil cylinder to push the rotary steering drilling simulation tool to move along a straight line at a constant speed;
step 6, measuring the displacement and stress value of the rotary steering drilling simulation tool in the axial direction by using an axial sensor, measuring the displacement and stress value of the rotary steering drilling simulation tool in the circumferential direction by using a Zhou Xiangchuan sensor, and determining the core pressing depth of the steering rib;
step 7, changing the hydraulic pressure values of the axial servo hydraulic cylinder and the circumferential servo hydraulic cylinder by using a servo hydraulic control system, 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 under the condition of different hydraulic pressure values, and determining the change rule of the pressing depth of the steering rib core along with the hydraulic pressure value;
step 8, maintaining the hydraulic pressure values of the axial servo hydraulic cylinder and the circumferential servo hydraulic cylinder constant, changing the loading speeds of the axial servo hydraulic cylinder and the circumferential servo hydraulic cylinder by using a servo hydraulic control system, repeating the steps 4 to 6 to obtain the displacement and the stress values of the rotary guiding drilling simulation tool in the circumferential direction and the axial direction under different loading speeds, and determining the change rule of the core pressing depth of the guiding rib along with the loading speed;
and 9, maintaining the hydraulic pressure values and loading speeds of the axial servo hydraulic cylinder and the circumferential servo hydraulic cylinder constant, repeating the steps 4 to 6 to obtain the displacement and 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 pressing depth of the steering rib core along with time.
Preferably, a plurality of 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 core pressing depth of the guide rib is determined according to the core pressing depth of the rotary guide rib under the condition of each rock mechanical parameter.
Preferably, the rock mechanical parameters include modulus of elasticity, compressive strength and poisson's ratio.
The invention has the beneficial technical effects that:
1. the experimental device for evaluating the stratum adaptability of the static push-type rotary guiding rib provided by the invention truly simulates the working state of the static push-type rotary guiding tool in the actual drilling process, converts the complex on-site rotary drilling process into an indoor experiment, realizes the simulation of the working condition of the guiding rib under the conditions of a horizontal well section and an inclined well section, has high experimental result accuracy, is low in manufacturing cost, is convenient to install and detach, and has extremely strong operability.
2. The invention provides an experimental method for evaluating stratum adaptability of a static push-against type rotary guide wing rib, which utilizes a servo hydraulic control system to control an axial servo hydraulic cylinder and a circumferential servo hydraulic cylinder, and researches the influence of drilling parameters on the working state of the guide wing rib by changing 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 changing 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 ribs of the rotary guide drilling simulation tool can be detached and replaced with different types of guide ribs for experiments, and the experimental method provided by the invention is beneficial to comprehensively researching the influence of each influence factor on the guide ribs of the static push type rotary guide drilling tool, and the adaptability of the guide ribs to different stratums is clarified through experiments, so that the simulation of the real drilling process is realized, and the selection of the proper guide ribs for the rotary guide drilling tool according to the real stratum conditions is facilitated.
Drawings
FIG. 1 is a schematic diagram of an experimental apparatus according to the present invention.
Fig. 2 is a schematic view of a core fixing device in the experimental device of the invention.
FIG. 3 is a schematic diagram of a rotary steerable drilling simulation tool housing in an experimental set-up 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 view of a pressing end of the circumferential servo hydraulic cylinder, and fig. 4 (b) is a schematic view of the circumferential servo hydraulic cylinder.
FIG. 5 is a schematic view of an axial pressurization device in the experimental device of the invention.
FIG. 6 is a schematic view of a guide rib in an experimental set-up of the present invention; fig. 6 (a) is a schematic structural view of an oblique pushing type guiding rib, and fig. 6 (b) is a schematic structural view of a horizontal pushing type guiding rib.
FIG. 7 is a schematic diagram of the principle of operation of the guide rib in the experimental set-up of the present invention; fig. 7 (a) is a schematic diagram of the working principle of the oblique pushing type guiding rib, and fig. 7 (b) is a schematic diagram of the working principle of the horizontal pushing type guiding rib.
In the figure, 1, core fixing device, 1.1, core placing hole, 1.2, core, 1.3, core fixing sleeve, 1.4, backer, 2, rotary guiding drilling simulation tool, 2.1, shell, 2.2, rib mounting groove, 2.3, guiding rib, 2.4, oblique pushing guiding rib, 2.5, horizontal pushing guiding rib, 2.6, reset spring, 3, circumferential pressurizing device, 3.1, circumferential servo hydraulic cylinder, 3.2, hydraulic plunger, 4, axial servo hydraulic cylinder, 5, servo hydraulic control system, 6, bracket, 7, backing plate.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
The invention relates to an experimental device for evaluating the stratum adaptability of a static pushing type rotary guiding rib, which is shown in figure 1 and comprises a core fixing device 1, a rotary guiding drilling simulation tool 2, a circumferential pressurizing device 3 and an axial pressurizing device.
The core fixing device 1 is arranged on the backing plate 7, the backing plate 7 is in direct contact with the bottom surface of the core fixing device 1, and can bear the load applied to the core fixing device 1, so that the influence of external environment in the experimental process is avoided; the rock core fixing device 1 is shown in fig. 2, and comprises a pair of backer 1.4 and a rock core fixing sleeve 1.3, wherein the backer 1.4 is symmetrically arranged at two sides of the rock core fixing sleeve 1.3 and is used for fixing the rock core fixing sleeve 1.3 on a backing plate 7 so as to prevent the rock 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 a core 1.2, the core 1.2 is placed in the core placing hole 1.1 and is of a hollow cylinder structure, and the inner wall is used for simulating a well wall.
The rotary steering drilling simulation tool 2 is arranged in the hollow part of the core 1.2 and comprises a shell 2.1 and guide ribs 2.3, the size of the shell 2.1 is the same as that of a working part of the actual rotary steering drilling tool, in the embodiment, three rib mounting grooves 2.2 are formed in the surface of the shell 2.1 at equal intervals along the circumferential direction, as shown in fig. 3, detachable guide ribs 2.3 are arranged in the three rib mounting grooves 2.2, as shown in fig. 6, the guide ribs 2.3 can be inclined push type rotary guide ribs 2.4 or horizontal push type rotary guide ribs 2.5; the inclined pushing type rotary guide wing rib 2.4 and the horizontal pushing type rotary guide wing rib 2.5 are internally provided with a reset spring 2.6, as shown in fig. 7, when pressure is applied to the reset spring 2.6, the reset spring 2.6 is compressed, the supporting guide wing rib 2.3 is pushed out of the wing rib mounting groove 2.2, the guide wing rib 2.3 is tightly attached to the inner wall of the rock core 1.2, and the working state of the guide wing rib 2.3 in the actual drilling process is simulated; when the pressure applied to the reset spring 2.6 is stopped, the reset spring 2.6 is restored to an original state, the guide rib 2.3 is retracted into the rib mounting groove 2.2, so that the extension and retraction of the guide rib 2.3 can be controlled by adjusting the pressure applied by the reset spring 2.6, the working state of the guide rib 2.3 in the actual drilling process is simulated, meanwhile, the rotary guide drilling simulation tool 2 in the embodiment adopts a circumferential three-rib structure, and compared with the single-rib rotary guide drilling simulation tool, the rotary guide drilling simulation tool is closer to the field working condition, the actual drilling process can be reflected more, and the simulation result is more accurate.
The rotary steering drilling simulation tool 2 is internally provided with a circumferential pressurizing device 3, as shown in fig. 4, the circumferential pressurizing device 3 comprises circumferential servo hydraulic cylinders 3.1 and Zhou Xiangchuan sensors, the pressurizing end of each circumferential servo hydraulic cylinder 3.1 is provided with a plurality of hydraulic plungers 3.2 for pushing the guide ribs 2.3 to be clung 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 ribs 2.3, the hydraulic plungers 3.2 are distributed at equal intervals and are arranged at positions opposite to the rib mounting grooves 2.2, the top ends of the hydraulic plungers 3.2 are provided with circumferential sensors, the circumferential sensors are in contact with the guide ribs 2.3 and are used for measuring the drilling displacement and the stress value of the guide ribs 2.3 in the horizontal direction in the experimental process, and determining the pressure exerted by the guide ribs 2.3 and the depth of the guide ribs 2.3 pressed into the core 1.2.
The axial pressurizing device is fixed at the upper position of the rotary steerable drilling simulation tool 2 through the bracket 6 and is positioned on the same straight line with the rotary steerable drilling simulation tool 2, and the inclination angles of the backing plate 7 and the bracket 6 are adjustable, so that the inclination angles of the axial pressurizing device and the core fixing device 1 are adjusted to be used for simulating horizontal well sections and inclined well sections with different angles, in the embodiment, the axial pressurizing device is arranged right above the rotary steerable drilling simulation tool 2, and as shown in fig. 5, the axial pressurizing device comprises an axial servo hydraulic cylinder 4 and an axial sensor, and the axial servo hydraulic cylinder 4 is used for pushing the rotary steerable drilling simulation tool 2 to move in the vertical direction in the core 1.2 and is used for simulating the actual drilling process of the rotary steerable drilling simulation tool 2; the axial sensor is arranged at the pressure applying end of the axial servo hydraulic oil cylinder 4, is contacted 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, wherein the stress value in the vertical direction is equivalent to the drilling 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 cylinder 3.1, the Zhou Xiangchuan sensor, the axial servo hydraulic cylinder 4 and the axial sensor are all connected with the 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 cylinder 3.1 and the axial servo hydraulic cylinder 4, can also control the Zhou Xiangchuan sensor and the axial sensor to acquire and store the measurement data of the circumferential sensor and the axial sensor, and the servo hydraulic control system 5 can realize independent control of the circumferential servo hydraulic cylinder 3.1 and the axial servo hydraulic cylinder 4 so that the two hydraulic cylinders do not affect each other; the Zhou Xiangchuan sensor comprises a circumferential force transducer and a circumferential displacement transducer, wherein the circumferential force transducer is used for measuring a circumferential hydraulic force value of the guide rib 2.3, namely, the circumferential force application size of the guide rib 2.3 is obtained, and the circumferential displacement transducer is used for measuring the extension length of the guide rib 2.3, namely, the depth of the guide rib 2.3 pressed into the core 1.2 is determined; the axial sensor comprises an axial force transducer and an axial displacement transducer, the axial force transducer is used for measuring an axial hydraulic pressure value born by the rotary steering drilling simulation tool 2, obtaining a drilling pressure value born by the rotary steering drilling simulation tool 2, and the axial displacement transducer is used for measuring the axial displacement of the rotary steering drilling simulation tool 2, and obtaining an actual footage of the rotary steering drilling simulation tool 2; the circumferential displacement sensor and the axial displacement sensor are non-contact magnetostriction displacement sensors, are not easily affected by a measuring environment, and have accurate measuring results.
Meanwhile, the experimental device provided by the invention is combined with the support 6 by adopting the axial pressurizing device, and the mechanical design is flexible, so that the experimental device can be horizontally placed or vertically placed, and can be used for simulating the drilling process of the rotary guiding drilling tool in an inclined well section and simulating the drilling process of the rotary guiding drilling tool in a horizontal well section, thereby being beneficial to comprehensively evaluating the stratum adaptability of the guiding ribs 2.3.
The invention also provides an experimental method for evaluating the stratum adaptability of the static pushing type rotary guide rib, which adopts the experimental device for evaluating the stratum adaptability of the static pushing type rotary guide rib and specifically comprises the following steps:
step 1, placing the core 1.2 in the core fixing sleeve 1.3, and fixing the core fixing sleeve 1.3 on the backing plate 7 by utilizing the leaning mountain 1.4 to prevent the core fixing sleeve 1.3 from moving in the experimental process.
And 2, installing a guide rib 2.3 in a rib installation groove 2.2 of a shell 2.1 of the rotary guide drilling simulation tool 2, checking the guide rib 2.3, ensuring the flexibility of the guide rib 2.3, placing a circumferential servo hydraulic cylinder 3.1 in the rotary guide drilling simulation tool 2, checking the circumferential servo hydraulic cylinder 3.1, and ensuring the flexibility of the circumferential servo hydraulic cylinder 3.1.
And 3, placing the rotary steerable drilling simulation tool 2 in the core 1.2, checking the axial servo hydraulic cylinder 4, ensuring the flexibility of the axial servo hydraulic cylinder 4, adjusting the position of the axial servo hydraulic cylinder 4, and fixing the axial servo hydraulic cylinder 4 right above the rotary steerable drilling simulation tool 2 so that the axial sensor is in contact with the rotary steerable drilling simulation tool 2.
And 4, controlling the hydraulic pressure value of the circumferential Xiang Cifu hydraulic oil cylinder 3.1 by using the servo hydraulic control system 5, and applying circumferential hydraulic pressure to the guide rib 2.3 of the rotary guide drilling simulation tool 2 by using the circumferential servo hydraulic oil cylinder 3.1 so that the guide rib 2.3 is closely attached to the inner wall of the core 1.2, simulating the working state of the guide rib 2.3 and keeping the hydraulic pressure value of the circumferential servo hydraulic oil cylinder 3.1 constant.
And step 5, controlling the hydraulic pressure value of the axial servo hydraulic oil cylinder 4 by utilizing the servo hydraulic control system 5, and applying axial hydraulic pressure to the rotary steerable drilling simulation tool 2 by the axial servo hydraulic oil cylinder 4 to push the rotary steerable drilling simulation tool 2 to move in the vertical direction at a constant speed so as to simulate the drilling process of the rotary steerable drilling tool.
And 6, measuring the displacement and stress value of the rotary steering drilling simulation tool 2 in the vertical direction by using an axial sensor, measuring the displacement and stress value of the rotary steering drilling simulation tool 2 in the horizontal direction by using a Zhou Xiangchuan sensor, and determining the core pressing depth of the steering rib 2.3.
And 7, changing the hydraulic pressure values of the axial servo hydraulic cylinder 4 and the circumferential servo hydraulic 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 pressing depth of the steering rib 2.3 along with the hydraulic pressure values.
And 8, maintaining the hydraulic pressure values of the axial servo hydraulic cylinder 4 and the circumferential servo hydraulic cylinder 3.1 constant, changing the loading speeds of the axial servo hydraulic cylinder 4 and the circumferential servo hydraulic 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 different loading speeds, and determining the change rule of the core pressing depth of the steering rib 2.3 along with the loading speed.
And 9, keeping the hydraulic pressure values and loading speeds of the axial servo hydraulic cylinder 4 and the circumferential servo hydraulic cylinder 3.1 constant, repeating the steps 4 to 6 to obtain displacement and 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 steering rib 2.3 along with time.
By adopting the experimental method for evaluating the stratum adaptability of the static pushing type rotary guide rib, which is provided by the invention, cores with different elastic moduli, compressive strengths and poisson ratios are respectively measured, the steps 1 to 6 are repeated, the depth of the guide rib 2.3 of the rotary guide drilling simulation tool 2 pressed into the core 1.2 in each simulated drilling process is determined, and the influence of the elastic moduli, the compressive strengths and the poisson ratios of the cores on the core pressed depth of the guide rib 2.3 is respectively determined according to the core pressed depth corresponding to the guide rib 2.3 under the condition of each rock mechanical parameter. In addition, the experimental method for evaluating the stratum adaptability of the static pushing type rotary guide rib provided by the invention can also be used for carrying out simulation experiments on different types of guide ribs 2.3 by replacing the guide ribs 2.3, repeating the steps 1 to 6 to obtain the depth of pressing the various types of guide ribs 2.3 into the core 1.2 under the same stratum condition, and evaluating the stratum adaptability of the guide ribs, so that the guide ribs more suitable for the stratum condition are selected, and the selection of the rotary guide drilling tool guide ribs in the actual rotary guide operation process is guided.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.
It should be understood that the above description is not intended to limit the invention to the particular embodiments disclosed, but to limit the invention to the particular embodiments disclosed, and that the invention is not limited to the particular embodiments disclosed, but is intended to cover modifications, adaptations, additions and alternatives falling within the spirit and scope of the invention.
Claims (3)
1. An experimental method for evaluating the stratum adaptability of a static push-type rotary guide rib is characterized by adopting an experimental device for evaluating the stratum adaptability of the static push-type rotary guide rib, and the experimental method comprises a 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 backing plate (7) and comprises a pair of backer (1.4) and a rock core fixing sleeve (1.3), the backer (1.4) is 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 in a rock core (1.2) and comprises a shell (2.1) and steering ribs (2.3), wherein a plurality of rib mounting grooves (2.2) are formed in the surface of the shell (2.1) at equal intervals along the circumferential direction, and steering ribs (2.3) are arranged in each rib mounting groove (2.2);
the circumferential pressurizing device (3) is arranged in the rotary steering drilling simulation tool (2) and comprises a circumferential servo hydraulic cylinder (3.1) and Zhou Xiangchuan sensors, hydraulic plungers (3.2) are arranged at positions, corresponding to all rib mounting grooves (2.2), of the pressurizing ends of the circumferential servo hydraulic cylinder (3.1), circumferential sensors are arranged at the top ends of the hydraulic plungers (3.2), and Zhou Xiangchuan sensors are in contact with the guide ribs (2.3);
the axial pressurizing device is fixed at the upper position of the rotary steering drilling simulation tool (2) through a bracket (6), is positioned on the same straight line with the rotary steering drilling simulation tool (2), and comprises an axial servo hydraulic cylinder (4) and an axial sensor, wherein the axial sensor is arranged at the pressurizing end of the axial servo hydraulic cylinder (4) and is contacted with the top end of the rotary steering drilling simulation tool (2);
the circumferential servo hydraulic cylinder (3.1), the Zhou Xiangchuan sensor, the axial servo hydraulic cylinder (4) and the axial sensor are connected with the servo hydraulic control system (5), the Zhou Xiangchuan sensor comprises a circumferential force sensor and a circumferential displacement sensor, and the axial sensor comprises an axial force sensor and an axial displacement sensor;
the core fixing sleeve (1.3) is made of 304 stainless steel or 45# steel, and the inclination angles of the backing plate (7) and the bracket (6) are adjustable;
the rock core (1.2) is of a hollow cylinder structure, the hollow part in the core is used for placing a rotary steering drilling simulation tool (2), and the inner wall of the rock core (1.2) is used for simulating a well wall;
the rotary steering drilling simulation tool (2) has the same size as the working part of the actual rotary steering drilling tool, the steering wing ribs (2.3) are inclined pushing type steering wing ribs (2.4) or horizontal pushing type steering wing ribs (2.5), a reset spring (2.6) is arranged in the rotary steering drilling simulation tool, and the steering wing ribs (2.3) can be detached and replaced;
the rotary steering drilling simulation tool (2) is provided with three steering ribs (2.3);
the circumferential displacement sensor and the axial displacement sensor are non-contact magnetostriction displacement sensors;
the 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 backing plate (7) by utilizing a backer (1.4);
step 2, installing a guide rib (2.3) in a rib installation groove (2.2) of a shell (2.1) of the rotary guide drilling simulation tool (2), checking the flexibility of the guide rib (2.3), placing a circumferential servo hydraulic cylinder (3.1) in the rotary guide drilling simulation tool (2), and checking the flexibility of the circumferential servo hydraulic cylinder (3.1);
step 3, placing the rotary steering drilling simulation tool (2) in the core (1.2), checking the flexibility of the axial servo hydraulic cylinder (4), adjusting the position of the axial servo hydraulic cylinder (4), and fixing the axial servo hydraulic cylinder (4) above the rotary steering drilling simulation tool (2) so that the axial servo hydraulic cylinder (4) and the rotary steering drilling simulation tool (2) are positioned on the same straight line;
step 4, controlling the hydraulic pressure value of a circumferential servo hydraulic cylinder (3.1) by using a servo hydraulic control system (5), and applying circumferential hydraulic pressure to a guide rib (2.3) of a rotary guide drilling simulation tool (2) by using the circumferential servo hydraulic cylinder (3.1) so that the guide rib (2.3) is closely attached to the inner wall of a core (1.2) and the hydraulic pressure value of the circumferential servo hydraulic cylinder (3.1) is kept constant;
step 5, controlling the hydraulic pressure value of an axial servo hydraulic oil cylinder (4) by using a servo hydraulic control system (5), and applying axial hydraulic pressure to the rotary steering drilling simulation tool (2) by the axial servo hydraulic oil cylinder (4) so as to push the rotary steering drilling simulation tool (2) to move along a straight line at a constant speed;
step 6, measuring the displacement and stress value of the rotary steering drilling simulation tool (2) in the axial direction by using an axial sensor, measuring the displacement and stress value of the rotary steering drilling simulation tool (2) in the circumferential direction by using a Zhou Xiangchuan sensor, and determining the core pressing depth of the steering rib (2.3);
step 7, changing the hydraulic pressure values of the axial servo hydraulic cylinder (4) and the circumferential servo hydraulic 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 circumferential direction and the axial direction under the condition of different hydraulic pressure values, and determining the change rule of the core pressing depth of the steering rib (2.3) along with the hydraulic pressure values;
step 8, maintaining the hydraulic pressure values of the axial servo hydraulic cylinder (4) and the circumferential servo hydraulic cylinder (3.1) to be constant, changing the loading speeds of the axial servo hydraulic cylinder (4) and the circumferential servo hydraulic cylinder (3.1) by using a servo hydraulic control system (5), repeating the steps 4 to 6 to obtain the displacement and stress values of the rotary guiding drilling simulation tool (2) in the circumferential direction and the axial direction under different loading speeds, and determining the change rule of the core pressing depth of the guiding rib (2.3) along with the loading speed;
and 9, maintaining the hydraulic pressure values and loading speeds of the axial servo hydraulic cylinder (4) and the circumferential servo hydraulic cylinder (3.1) constant, repeating the steps 4 to 6 to obtain displacement and stress values of the rotary steering drilling simulation tool (2) in the circumferential direction and the axial direction at different times, and determining the change rule of the core pressing depth of the steering rib (2.3) along with time.
2. The experimental method for evaluating the stratum adaptability of the static pushing rotary guide rib according to claim 1, wherein a plurality of 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 core pressing depth of the guide rib (2.3) is determined according to the core pressing depth of the rotary guide rib (2.3) under the condition of each rock mechanical parameter.
3. An experimental method for evaluating the formation suitability of a static push-against rotary steerable rib according to claim 2, wherein the rock mechanical parameters include modulus of elasticity, compressive strength and poisson's ratio.
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| CN105525872B (en) * | 2014-09-29 | 2018-03-09 | 中国石油化工集团公司 | Static pushing type rotary guiding device |
| CN106644212A (en) * | 2015-10-30 | 2017-05-10 | 中石化石油工程技术服务有限公司 | Device for testing wing rib of rotating guide tool |
| WO2018006585A1 (en) * | 2016-07-06 | 2018-01-11 | 山东大学 | Multi-functional true triaxial rock drilling test system and method |
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| CN112855018B (en) * | 2021-01-14 | 2022-08-02 | 中国石油大学(华东) | Experimental device and method for evaluating stratum adaptability of static pushing type rotary steering system |
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