CN111366393B - Casing buckling evaluation system in inclined shaft well cementation process - Google Patents

Casing buckling evaluation system in inclined shaft well cementation process Download PDF

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Publication number
CN111366393B
CN111366393B CN202010261883.7A CN202010261883A CN111366393B CN 111366393 B CN111366393 B CN 111366393B CN 202010261883 A CN202010261883 A CN 202010261883A CN 111366393 B CN111366393 B CN 111366393B
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China
Prior art keywords
well
casing
simulation unit
cement slurry
hollow
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CN111366393A (en
Inventor
牟善波
李靖
王晓宏
李先林
韩秀玲
郑龙
薛志龙
冶霆汉
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Xinjiang Zhengtong Oil & Gas Co ltd
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Xinjiang Zhengtong Oil & Gas Co ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M99/00Subject matter not provided for in other groups of this subclass

Abstract

The invention relates to a casing buckling evaluation system in an inclined shaft cementing process, which comprises the following steps: the well wall simulation unit defines a cavity to simulate a well wall, and the inclination control unit controls the well wall simulation unit to be in an inclined state; a hollow cannula extending into the cavity; the sleeve fixing device is used for fixing the top of the hollow sleeve; the casing shoe is arranged at the bottom of the cavity and is connected with the bottom of the hollow casing so as to seal the hollow casing; the cement slurry storage device is provided with a cement slurry control valve so as to control cement slurry in the cement slurry storage device to flow into the cavity; the shaft bottom sleeve is connected with the well wall simulation unit; an annulus pressure sensor; the detection device is used for detecting the vertical tension, the torque and the displacement of the hollow sleeve, so that buckling evaluation is carried out on the hollow sleeve according to the pressure value detected by the annular pressure sensor and the vertical tension, the torque and the displacement of the hollow sleeve, and the detection device is simple in structure, easy and convenient to operate and good in feasibility.

Description

Casing buckling evaluation system in inclined shaft well cementation process
Technical Field
The invention relates to the technical field of drilling processes, in particular to a casing buckling evaluation system in an inclined shaft cementing process.
Background
Well cementation is a later process in drilling engineering, aims to form a cement sheath between the outer wall of a casing and a borehole, and provides a foundation for later oil well development. In the well cementation process, pre-fluid, cement slurry, post-fluid and the like are required to be injected into the hollow casing, so that the cement slurry and other liquids return out from the bottom of the casing and are finally filled into the annulus. However, in the cement slurry injection process, the height of the liquid column in the casing pipe is gradually reduced, while the height of the liquid column in the annular space is continuously increased, and buoyancy generated by the difference between the liquid level inside and outside the casing pipe can affect the casing pipe. When the casing centralizer is not installed or is not installed properly, the casing is displaced due to buckling of buoyancy on the casing, and the well cementation quality is reduced. Especially in deviated or horizontal wells, buoyancy has a greater effect on the casing than in vertical wells.
At present, the influence of buoyancy on the action of a casing is usually calculated on site by adopting an empirical formula, but the influence effect of a single variable on the casing is not clear due to the complex casing stress, the thousands of well paths and the uncertain effect of the single variable in an actual well site, so that the influence of the buoyancy on the casing cannot be effectively evaluated.
Disclosure of Invention
In order to solve the problems in the prior art at least to a certain extent, the invention provides a casing buckling evaluation system in the inclined shaft well cementation process, which realizes the evaluation of the buckling of a hollow casing by simulating the action of buoyancy on the hollow casing in the inclined shaft well cementation process, and has the advantages of simple structure, simple and convenient operation and good feasibility.
In order to achieve the purpose, the invention adopts the main technical scheme that:
the embodiment of the invention provides a casing buckling evaluation system in a cementing process of an inclined shaft, which comprises: the inclined shaft simulation device comprises a shaft wall simulation unit and an inclination control unit, wherein the shaft wall simulation unit defines a cavity to simulate a shaft wall, and the inclination control unit controls the shaft wall simulation unit to be in an inclined state and adjusts the inclination angle of the shaft wall simulation unit; a hollow sleeve extending into the cavity; the casing fixing device is positioned above the well wall simulation unit and used for fixing the top of the hollow casing; the casing shoe is arranged at the bottom of the cavity and is connected with the bottom of the hollow casing so as to seal the hollow casing; the cement slurry storage device is positioned above the well wall simulation unit, a cement slurry control valve is arranged on the cement slurry storage device, and the cement slurry control valve is used for controlling cement slurry in the cement slurry storage device to flow into the cavity; the shaft bottom sleeve is positioned below the well wall simulation unit and is connected with the well wall simulation unit; the annular pressure sensor is arranged in the bottom-hole sleeve, the upper part of the annular pressure sensor is in contact with the bottom surface of the well wall, and the lower part of the annular pressure sensor is in contact with the bottom of the bottom-hole sleeve; and the detection device is used for detecting the vertical tension, the torque and the displacement of the hollow sleeve so as to carry out buckling evaluation on the hollow sleeve according to the pressure value detected by the annular pressure sensor and the vertical tension, the torque and the displacement of the hollow sleeve.
The casing buckling evaluation system in the inclined shaft cementing process provided by the embodiment of the invention has the advantages that the cavity is limited by the well wall simulation unit to simulate the well wall, and controls the well wall simulation unit to be in an inclined state through the inclination control unit to realize inclined well simulation, and controlling the cement slurry to flow into the cavity, so that the height difference of the inner liquid column and the outer liquid column occurs in the hollow casing in the cavity, the hollow casing is influenced by the buoyancy effect, and the stress change process of the hollow sleeve is analyzed by detecting the vertical tension, the torque and the displacement of the hollow sleeve and the pressure value detected by the annular pressure sensor, therefore, monitoring and evaluation of buckling of the hollow casing are realized, the structure is simple, the operation is convenient, the feasibility is good, the influence of the buoyancy of cement slurry on the stress change of the hollow casing in the inclined shaft well cementation process can be simply, conveniently, quickly and quantitatively evaluated, and the purpose of evaluating the buckling of the casing is achieved.
Optionally, the slope the control unit includes base and rack portion, support arm and bank angle control part, the frame upper portion of base and rack portion with the upper portion of wall of a well analog unit links to each other, bank angle control part sets up the frame lower part of base and rack portion, and passes through the support arm with the lower part of wall of a well analog unit links to each other, bank angle control part is through control the support arm rotates in order to right wall of a well analog unit's inclination adjusts.
Specifically, the frame upper portion of base and frame portion with the upper portion of wall of a well simulation unit is articulated, the support arm includes first rotating part and second rotating part, the one end of first rotating part with the well skew angle control unit is articulated, the other end of first rotating part with the one end of second rotating part is articulated, the other end of second rotating part with the lower part of wall of a well simulation unit is articulated, the well skew angle control unit is through control first rotating part rotates, in order to drive the second rotating part rotates, and passes through the rotatory drive of second rotating part the wall of a well simulation unit swings.
Optionally, the detection device includes a first sensor unit disposed in the casing fixing device and a plurality of second sensor units disposed on the hollow casing, the first sensor unit is configured to detect a vertical pulling force and a torque of the hollow casing, and the plurality of second sensor units are configured to detect a torque and a displacement of the hollow casing.
Alternatively, the casing securing means and the cement slurry reservoir means may be provided integrally.
Optionally, the casing buckling evaluation system in the inclined shaft cementing process further comprises a well inclination angle measuring instrument, wherein the well inclination angle measuring instrument is arranged on the outer wall of the well wall simulation unit to detect the inclination angle of the well wall simulation unit, so that buckling evaluation is performed on the hollow casing according to the pressure value detected by the annular pressure sensor and the vertical tension, torque and displacement of the hollow casing under the condition of different well inclination angles.
Optionally, the pressure value detected by the annulus pressure sensor decreases as the cement slurry in the cavity progressively sets.
Optionally, the borehole wall simulation unit is connected with the bottom hole sleeve through threads.
Optionally, the shoe is of solid construction.
Optionally, the cement slurry control valve is located on the underside of the cement slurry reservoir device and corresponds to the entrance to the cavity.
Drawings
FIG. 1 is a schematic structural diagram of a casing buckling evaluation system in a deviated well cementing process according to an embodiment of the invention.
[ description of reference ]
1: a cement slurry reservoir and casing fixing device;
2: a cement slurry control valve;
3: a hollow sleeve;
4: a well wall simulation unit;
5: a displacement and torque sensor unit;
6: a casing shoe;
7: an annulus pressure sensor;
8: a bottom hole sleeve;
9: a base and a frame part;
10: a well inclination angle control section;
11: a support arm;
111: a first rotating section;
112: a second rotating section;
12: a well deviation angle measuring instrument;
100: a slant well simulation device;
101: a tilt control unit.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
According to the casing buckling evaluation system in the inclined shaft cementing process, the cavity is defined through the well wall simulation unit to simulate the well wall, the well wall simulation unit is controlled to be in an inclined state through the inclination control unit, inclined shaft simulation is achieved, in the process that cement slurry flows into the cavity, the hollow casing is under the action of cement slurry buoyancy, the stress change process of the hollow casing is analyzed through detecting vertical tension, torque and displacement of the hollow casing and the pressure value detected by the annular pressure sensor, and therefore buckling monitoring and evaluation of the hollow casing are achieved.
In order to better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The casing buckling evaluation system in the inclined shaft cementing process according to the embodiment of the invention is described below with reference to the attached drawings.
As shown in fig. 1, the casing buckling evaluation system in the inclined shaft cementing process according to the embodiment of the present invention includes an inclined shaft simulation apparatus 100, a hollow casing 3, a casing fixing apparatus, a casing shoe 6, a cement slurry reservoir apparatus, a bottom hole sleeve 8, an annular pressure sensor 7, and a detection apparatus.
The inclined shaft simulation device 100 comprises a shaft wall simulation unit 4 and an inclination control unit 101, wherein the shaft wall simulation unit 4 defines a cavity to simulate a shaft wall, the inclination control unit 101 controls the shaft wall simulation unit 4 to be in an inclined state to realize inclined shaft simulation, and the inclination angle of the shaft wall simulation unit 4 is adjusted; the hollow sleeve 3 extends into the cavity.
The casing fixing device is located above the well wall simulation unit 4 and used for fixing the top of the hollow casing 3, the cement slurry storage device is located above the well wall simulation unit 4, the cement slurry storage device is provided with a cement slurry control valve 2, and the cement slurry control valve 2 is used for controlling cement slurry in the cement slurry storage device to flow into the cavity.
Alternatively, as an example, as shown in fig. 1, the casing fixing device and the cement slurry reservoir device may be provided in one piece, i.e. the cement slurry reservoir and casing fixing device 1.
And, the grout control valve 2 is located the grout reservoir device namely the grout reservoir and the downside of sleeve pipe fixing device 1, and is corresponding with the entry of cavity, is convenient for control grout to flow into the cavity.
As shown in FIG. 1, a casing shoe 6 is disposed at the bottom of the cavity and is coupled to the bottom of the hollow casing 3 to seal the hollow casing 3. As an embodiment, the casing shoe 6 is of a solid structure, which can effectively prevent cement slurry injected into the cavity from entering the hollow casing 3.
The bottom hole sleeve 8 is positioned below the borehole wall simulation unit 4 and is connected with the borehole wall simulation unit 4. Specifically, the well wall simulation unit 4 is connected with the well bottom sleeve 8 through threads, so that the well wall simulation unit is convenient to fix and can bear heavy weight.
As shown in figure 1, the annular pressure sensor 7 is arranged in the bottom hole sleeve 8, the upper part of the annular pressure sensor 7 is in contact with the bottom surface of the well wall, the lower part of the annular pressure sensor 7 is in contact with the bottom of the bottom hole sleeve 8, and the annular pressure sensor 7 can detect the liquid column pressure value of the environment in real time.
The detection device is used for detecting the vertical tension, the torque and the displacement of the hollow sleeve 3 so as to carry out buckling evaluation on the hollow sleeve according to the pressure value detected by the annular pressure sensor 7 and the vertical tension, the torque and the displacement of the hollow sleeve.
That is to say, in the embodiment of the invention, the cavity is defined by the well wall simulation unit to simulate the well wall, the well wall simulation unit is controlled to be in an inclined state by the inclination control unit to realize inclined well simulation and control cement slurry to flow into the cavity, so that the height difference of an inner liquid column and an outer liquid column of the hollow casing in the cavity is generated, the hollow casing is influenced by buoyancy action everywhere, and the stress change process of the hollow casing is analyzed by detecting the vertical tension, the torque and the displacement of the hollow casing and the pressure value detected by the annular pressure sensor, so that the monitoring and evaluation on the buckling of the hollow casing are realized.
According to an embodiment of the present invention, as shown in fig. 1, the inclination control unit 101 includes a base and a frame portion 9, a support arm 11, and a bevel angle control portion 10, wherein an upper portion of the frame of the base and the frame portion 9 is connected to an upper portion of the borehole wall simulation unit 4, the bevel angle control portion 10 is disposed at a lower portion of the frame of the base and the frame portion 9 and is connected to a lower portion of the borehole wall simulation unit 4 through the support arm 11, and the bevel angle control portion 10 controls the support arm 11 to rotate to adjust an inclination angle of the borehole wall simulation unit 4, that is, by adjusting an included angle between the frame of the base and the frame portion 9 and the borehole wall simulation unit 4, the inclination angle of the inclined shaft is adjustable.
Specifically, as shown in fig. 1, the upper portion of the frame of the base and the frame unit 9 is hinged to the upper portion of the borehole wall simulation unit 4, the support arm 11 includes a first rotating portion 111 and a second rotating portion 112, one end of the first rotating portion 111 is hinged to the borehole wall angle control portion 10, the other end of the first rotating portion 111 is hinged to one end of the second rotating portion 112, the other end of the second rotating portion 112 is hinged to the lower portion of the borehole wall simulation unit 4, and the borehole wall angle control portion 10 controls the first rotating portion 111 to rotate, that is, the first rotating portion 111 rotates around a hinge point between the first rotating portion 111 and the borehole wall angle control portion 10 and around a length (approximate value) of the first rotating portion 111, so as to drive the second rotating portion 112 to rotate, and drive the borehole wall simulation unit 4 to swing through rotation of the second rotating portion 112, thereby achieving adjustment of the inclination angle of the inclined shaft.
In the embodiment of the invention, the wall of a well simulation unit 4 swings through the rotation of the supporting arm 11, so that the included angle between the base and the rack of the rack part 9 and the wall of a well simulation unit 4 is adjustable, the structure is simple and reliable, and the realization is easy.
It should be understood that, in other embodiments of the present invention, the inclination angle control portion 10 may also control the motion of the supporting arm 11 in other manners, so as to implement the swing of the well wall simulation unit 4, for example, the supporting arm 11 may be driven to extend and retract in a hydraulic driving manner, so as to implement the adjustable inclination angle of the inclined well, which will not be described herein again.
Alternatively, in one embodiment of the present invention, as shown in fig. 1, the detection device includes a first sensor unit (not shown) disposed in the casing fixing device for detecting the vertical pulling force and the torque of the hollow casing and a plurality of second sensor units 5 disposed on the hollow casing 3 for detecting the torque and the displacement of the hollow casing 3.
It should be noted that, in the embodiment of the present invention, the sensors for detecting the tension, the torque, and the displacement of the hollow casing may be a displacement sensor, a torque sensor, and the like, which are commonly used in the art, and only need to be configured to detect the stress parameters of the hollow casing such as the torque, the displacement, and the like, and thus, detailed description is omitted here.
Further, according to an embodiment of the present invention, as shown in fig. 1, the casing buckling evaluation system during cementing of an inclined well further includes a borehole wall inclination angle measuring instrument 12, where the borehole wall inclination angle measuring instrument 12 is disposed on an outer wall of the borehole wall simulation unit 4 to detect an inclination angle of the borehole wall simulation unit 4, that is, an inclination angle of the inclined well, so as to perform buckling evaluation on the hollow casing according to a pressure value detected by the annular pressure sensor and a vertical tension, a torque and a displacement of the hollow casing under conditions of different borehole angles.
That is to say, by arranging the well inclination angle measuring instrument 12 on the outer wall of the well wall simulation unit 4, in the process that the well inclination angle control part 10 rotates to adjust the inclination angle of the well wall simulation unit 4 through the control supporting arm 11, the well inclination angle measuring instrument 12 can detect the inclination angle of the inclined well in real time, and can realize quantitative evaluation on buckling of the casing in the process of cementing the inclined well by recording the stress and buckling states of the hollow casing under the conditions of different well inclination angles, accurately simulate the influence of buoyancy of cement slurry on the casing in an actual well site, and improve the well cementing quality.
In the embodiment of the invention, the annular pressure sensor 7 at the bottom is used for recording the change condition of the pressure water head acting on the bottom in the cement slurry solidification process, and as the cement slurry is gradually solidified, the pressure water head acting on the bottom is gradually reduced, and the indication of the annular pressure sensor at the bottom is gradually reduced, namely, the pressure value detected by the annular pressure sensor 7 is reduced along with the gradual solidification of the cement slurry in the cavity.
In addition, the formula of the cement paste can be changed for repeated tests, so that the influence of different cement paste properties (such as density) on the buckling of the hollow casing can be researched.
Specifically, in an embodiment of the present invention, as shown in fig. 1, the casing buckling evaluation system in the inclined shaft cementing process includes a cement slurry reservoir and casing fixing device 1, a cement slurry control valve 2, a hollow casing 3, a well wall simulation unit 4 simulating a well wall, a plurality of displacement and torque sensor units 5, a casing shoe 6, an annular pressure sensor 7, a well bottom sleeve 8, a base and frame portion 9, a well inclination angle control portion 10, a support arm 11 and a well inclination angle measuring instrument 12. Wherein, the cement slurry storage and casing fixing device 1 can store cement slurry and can fix the top of the hollow casing 3, and record the vertical tension and torque of the hollow casing 3 in real time through a built-in sensor, the cement slurry control valve 2 is positioned below the cement slurry storage and casing fixing device 1 and can control the cement slurry to flow into the well simulated by the well wall simulation unit 4, the well wall simulation unit 4 is of a hollow tubular structure and forms an annular cavity, the upper side wall of the well wall simulation unit 4 is hinged with the upper part of the base and the frame part 9, the lower side wall of the well wall simulation unit 4 is hinged with the supporting arm 11, the bottom of the well wall simulation unit 4 is in threaded connection with the well bottom sleeve 8, the hollow casing 3 is positioned in the cavity of the well wall simulation unit 4, the hollow casing 3 is provided with a plurality of displacement and torque sensor units 5 and can record the torque and displacement of the hollow casing 3 in real time, connecting casing shoes 6 are connected to 3 bottoms of hollow casing, casing shoes 6 are solid construction, can prevent that grout from getting into inside 3 of hollow casing, the upper portion of annular pressure sensor 7 and the bottom surface contact of wall of a well analog unit 4, the lower part of annular pressure sensor 7 and the inside contact of shaft bottom sleeve 8, can the liquid column pressure value of real-time recording environment, well head angle control part 10 is located base and frame portion 9 lower part, can control support arm 11 and rotate, and then control the well head angle of wall of a well analog unit 4, well head angle measuring apparatu 12 is located the outer wall of a well analog unit 4, can real-time measurement wall of a well head angle of wall analog unit 4. According to the casing buckling evaluation system in the inclined shaft well cementation process, the detection values of the sensors under different well inclination angles are recorded, so that the stress and buckling states of the hollow casing are analyzed, and finally the casing buckling evaluation in the inclined shaft well cementation process is achieved.
In conclusion, in the embodiment of the invention, as the casing shoe which does not leak cement slurry is arranged at the lower part of the hollow casing, when the annular cavity is filled with the cement slurry, the influence of buoyancy on the casing is the largest, and the casing shoe can be used as a key object for simulation of the system. The height difference of the liquid columns inside and outside the hollow sleeve causes the sleeve to be under the action of buoyancy. In a deviated well, the hollow casing is inclined, the buoyancy is vertical upwards, the buoyancy deviates from the axial direction of the casing to further generate stress on the lateral direction of the casing, and the casing is buckled, and the buckling can obviously reduce the well cementation quality in the well with the centralizer installed improperly or without the centralizer. In the casing buckling evaluation system in the inclined shaft well cementation process, disclosed by the embodiment of the invention, the sensor is arranged on the upper part of the hollow casing in the casing fixing device, and the displacement and torque sensor on the wall surface of the casing can record the stress parameters such as vertical tension, torque and displacement of the hollow casing in real time, so that the stress state and the time-varying condition of the hollow casing are evaluated. The annular pressure sensor at the bottom records the cement slurry solidification process, the pressure water head acting on the bottom is gradually reduced along with the gradual solidification of the cement slurry, and the reading of the annular pressure sensor at the bottom is gradually reduced. Through the detection values of the sensors, the buckling and stress change processes of the hollow casing caused by the buoyancy of the cement paste in the gradual solidification process of the cement paste can be recorded in real time, so that the purposes of casing buckling monitoring and evaluation are achieved.
Therefore, the casing buckling evaluation system in the inclined shaft well cementation process of the embodiment of the invention analyzes the influence of the buoyancy of the cement slurry and the solidification of the cement slurry on the stress and the buckling of the casing by recording the change condition of the detection value of each sensor in the cement slurry solidification process, and realizes the evaluation of the influence of the casing buckling in the inclined shaft well cementation process.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; either as communication within the two elements or as an interactive relationship of the two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, a first feature may be "on" or "under" a second feature, and the first and second features may be in direct contact, or the first and second features may be in indirect contact via an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lower level than the second feature.
In the description herein, the description of the terms "one embodiment," "some embodiments," "an embodiment," "an example," "a specific example" or "some examples" or the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are illustrative and not restrictive, and that those skilled in the art may make changes, modifications, substitutions and alterations to the above embodiments without departing from the scope of the present invention.

Claims (9)

1. The utility model provides a casing buckling evaluation system in inclined shaft well cementation process which characterized in that includes:
the inclined shaft simulation device comprises a shaft wall simulation unit and an inclination control unit, wherein the shaft wall simulation unit defines a cavity to simulate a shaft wall, and the inclination control unit controls the shaft wall simulation unit to be in an inclined state and adjusts the inclination angle of the shaft wall simulation unit;
a hollow sleeve extending into the cavity;
the casing fixing device is positioned above the well wall simulation unit and used for fixing the top of the hollow casing;
the casing shoe is arranged at the bottom of the cavity and is connected with the bottom of the hollow casing so as to seal the hollow casing;
the cement slurry storage device is positioned above the well wall simulation unit, a cement slurry control valve is arranged on the cement slurry storage device, and the cement slurry control valve is used for controlling cement slurry in the cement slurry storage device to flow into the cavity;
the shaft bottom sleeve is positioned below the well wall simulation unit and is connected with the well wall simulation unit;
the annular pressure sensor is arranged in the bottom-hole sleeve, the upper part of the annular pressure sensor is in contact with the bottom surface of the well wall, and the lower part of the annular pressure sensor is in contact with the bottom of the bottom-hole sleeve; the annular pressure sensor is used for detecting the liquid column pressure value of the environment in real time;
the detection device is used for detecting the vertical tension, the torque and the displacement of the hollow sleeve so as to carry out buckling evaluation on the hollow sleeve according to the pressure value detected by the annular pressure sensor and the vertical tension, the torque and the displacement of the hollow sleeve;
the detection device comprises a first sensor unit arranged in the sleeve fixing device and a plurality of second sensor units arranged on the hollow sleeve, wherein the first sensor unit is used for detecting the vertical tension and the torque of the hollow sleeve, and the second sensor units are used for detecting the torque and the displacement of the hollow sleeve.
2. The casing buckling evaluation system in the inclined shaft cementing process according to claim 1, wherein the inclination control unit comprises a base and a frame part, a support arm and an inclination angle control part, the upper parts of the frames of the base and the frame part are connected with the upper part of the well wall simulation unit, the inclination angle control part is arranged at the lower parts of the frames of the base and the frame part and is connected with the lower part of the well wall simulation unit through the support arm, and the inclination angle control part controls the support arm to rotate so as to adjust the inclination angle of the well wall simulation unit.
3. The system for evaluating casing buckling during cementing of an inclined shaft according to claim 2, wherein the upper portions of the frames of the base and the frame portion are hinged to the upper portion of the well wall simulation unit, the support arm comprises a first rotating portion and a second rotating portion, one end of the first rotating portion is hinged to the well inclination angle control portion, the other end of the first rotating portion is hinged to one end of the second rotating portion, the other end of the second rotating portion is hinged to the lower portion of the well wall simulation unit, and the well inclination angle control portion controls the first rotating portion to rotate so as to drive the second rotating portion to rotate and drive the well wall simulation unit to swing through rotation of the second rotating portion.
4. The system for casing buckling evaluation during slant well cementing of claim 1, wherein said casing securing means is integral with said cement slurry reservoir means.
5. The system for evaluating casing buckling during cementing of a deviated well according to claim 1, further comprising a well inclination angle measuring instrument disposed on an outer wall of the well wall simulation unit to detect an inclination angle of the well wall simulation unit, so as to evaluate buckling of the hollow casing according to a pressure value detected by the annular pressure sensor and a vertical tension, a torque and a displacement of the hollow casing under different well inclination angles.
6. The system for casing buckling evaluation during deviated well cementing of claim 1, wherein the value of the pressure detected by the annulus pressure sensor decreases as the cement slurry in the cavity gradually sets.
7. The system for evaluating buckling of a casing during cementing of a deviated well according to claim 1, wherein the borehole wall simulation unit is in threaded connection with the bottom-hole sleeve.
8. The system for casing buckling evaluation during cementing of a deviated well according to claim 1 wherein the casing shoe is of solid construction.
9. The system for casing buckling evaluation during slant well cementing of claim 1, wherein said cement slurry control valve is located on the underside of said cement slurry reservoir means and corresponds to the entrance to said cavity.
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