CN211115966U - Mechanical inclinometer based on drilling fluid circulation - Google Patents

Abstract

The utility model discloses a mechanical type deviational survey instrument based on drilling fluid circulation, include pulse generator, coding control mechanism, deviational survey mechanism, damping device that communicate in proper order according to drilling fluid circulation direction and the base that communicates with the drill bit, the base on be provided with cladding damping device, deviational survey mechanism and coding control mechanism's shell. The utility model has the advantages that: the scheme can realize the function of wireless inclination measurement while drilling, realize the measurement of drilling parameters under the condition of not influencing normal drilling, avoid the phenomenon that construction errors are large due to delay of measurement data, and be convenient for correct the errors in time.

Description

Mechanical inclinometer based on drilling fluid circulation

Technical Field

The utility model relates to a well drilling technical field specifically is a mechanical type deviational survey instrument based on drilling fluid circulation.

Background

The problem of well deviation is a very important problem in the production of oil and gas wells. Especially, the well deviation problem under the condition of high and steep construction not only causes that the mechanical drilling speed is low, thereby causing long drilling period and high drilling cost, but also often causes that the well is filled halfway and heavily drilled or scrapped when the well body quality is unqualified and serious, thereby avoiding the well construction period by mistake and even failing to achieve the preset exploration and development purpose. From the last 20 s, engineers and researchers have conducted theoretical research and tool development on well deviation problems and deviation prevention measures, and developed deviation prevention tools by various well deviation control schemes. These theories and tools play a role in controlling the well deviation but do not completely avoid it. All oil and gas wells up to now experience varying degrees of well deviation during the drilling process. Since the problem of the well deviation is inevitable, it is necessary to measure the well deviation to ensure that the well deviation is within the allowable range to avoid the occurrence of the downhole accident. Therefore, the measurement of the well deviation is indispensable work in the drilling engineering and has important significance for controlling the well deviation and ensuring the well quality.

The inclination measurement technology is developed for solving the inclination measurement problem of oil and gas wells, and is mainly used for measuring the well inclination of a vertical well, namely measuring the size of the oil and gas well deviating from a plumb line to ensure that a well hole is vertical as much as possible at the beginning. Later, with the progress of drilling technology and the need of complex oil and gas reservoir exploitation, special process wells such as directional wells, horizontal wells and the like are developed, and corresponding measuring instruments are developed. Reviewing the history of the development of the inclinometer technique, it is possible to divide it into three stages. The first stage is siphon inclinometer technology, which is based on the principle that the liquid level is always kept horizontal to measure well inclination. The inclinometer technology is basically eliminated due to inconvenient operation and the need of long time and quiet ear. The second stage is a photo-inclinometer technique whose basic principle is to measure the well inclination and azimuth angle by imaging on a compass through a pendulum and compass using gravity and magnetic principles. The technology is widely used in oil fields from the late century. Instruments associated with the photographic inclinometer technology include a photographic single point inclinometer, a multipoint inclinometer, and the like. Photographic single-point inclinometers are still in use at present and photographic multipoint inclinometers are replaced by electronic multipoint inclinometers due to the inconvenient reading. The third stage is electronic inclinometry, which has the basic principle of measuring earth gravity field strength with accelerometer and fluxgate. The technology is introduced from foreign countries at first in the late era of the era and is successively developed through scientific research of technicians in China to successfully develop an electronic single-point inclinometer, an electronic single-point inclinometer and the like. In the 70 th century of the 20 th century, wired measurement-while-drilling instruments and wireless measurement-while-drilling instruments were developed to meet the drilling process requirements of directional wells and horizontal wells in China, and the research and development of wired measurement-while-drilling and wireless inclination measurement technologies were carried out on the basis of digesting and absorbing key technologies. At present, a plurality of manufacturers for producing wired measurement-while-drilling instruments and wireless measurement-while-drilling instruments exist in China.

The mechanical wireless inclination measurement while drilling technology integrates mechanical, hydraulic and drilling fluid pulse technologies, and utilizes a precise mechanical structure to measure the well inclination. The underground instrument is a pure mechanical mechanism, and well deviation measurement, well deviation information conversion, pulse signal generation and the like are all realized through a mechanical device. It can be installed on a downhole drilling tool before down-hole drilling like MWD to realize measurement while drilling and real-time well deviation monitoring. The mechanical wireless inclinometer while drilling has the advantages of convenient operation and use, no influence of temperature and well depth and the like, and is widely applied to deep wells, high-temperature special vertical wells and the like.

The research work in the aspect of the mechanical wireless inclination measurement while drilling technology starts from the end of the 20 th century in the 50 th year and succeeds in the 60 th year. The mechanical wireless inclinometer while drilling developed by BJHoughes corporation in the end of 70 s is beginning to be popularized and applied on site. After more than thirty years of research and improvement, great achievements are made on the aspect of research and application of the technology of mechanical wireless inclination measurement while drilling, and various types of mechanical inclination measuring instruments are researched and designed.

China has gained important achievements in the research work of drilling inclinometers, but the research of the mechanical inclinometers is still blank. In China, systematic research on the mechanical wireless inclinometer while drilling is not carried out, and units and manufacturers for developing and producing mechanical inclinometers are not available. The invention relates to a mechanical inclinometer in a Chinese invention patent 'self-adjusting mechanical inclinometer while drilling', which is filed in 1986 by the China institute of Petroleum and geology, China, property and mineral products, and has no product and related research reports.

SUMMERY OF THE UTILITY MODEL

For overcoming the not enough of prior art, the utility model provides a mechanical type deviational survey instrument based on drilling fluid circulation can realize the wireless work of deviational survey along with boring of mechanical type in order to measure the well skew.

The utility model provides a technical scheme that above-mentioned problem adopted is: the mechanical inclinometer based on drilling fluid circulation comprises a pulse generation device, a coding control mechanism, an inclinometry mechanism, a damping device and a base communicated with a drill bit, wherein the pulse generation device, the coding control mechanism, the inclinometry mechanism and the damping device are sequentially communicated according to the circulation direction of drilling fluid, and the base is provided with a shell for coating the damping device, the inclinometry mechanism and the coding control mechanism.

Further, for better realization the utility model discloses, pulse generator include with the shell intercommunication the pulse ring, a plurality of setting in the pulse ring and with the coaxial throttle ring of pulse ring, set up at the intra-annular pulse pestle of pulse ring, be located the pulse ring intra-annular and with pulse pestle sliding connection's pulse pole and with the pulse valve that the pulse pole transmission is connected, the middle part of throttle ring is the orifice coaxial with the pulse ring.

Further, for better realization the utility model discloses, code control mechanism including setting up the code base in the shell, set up the control cylinder on the code base, slide spacing section of thick bamboo, the control shaft that sets up on the control cylinder, slide setting just pass the code base in the control cylinder, a plurality of sets up diameter on the control shaft is greater than the control shaft and with the coaxial ball-stopping post of control shaft, a plurality of setting on the control cylinder and with ball-stopping post cooperation use, the suit is on the control cylinder and with the execution section of thick bamboo that the pulse rod transmission is connected, the execution section of thick bamboo is connected with spacing section of thick bamboo transmission, spacing section of thick bamboo and code base between be provided with the spring, ball-stopping post and code base between be provided with the control spring.

Further, for better realization the utility model discloses, the deviational survey mechanism including articulate the pendulum in the control shaft bottom and set up in the shell and the inside ladder ring that is equipped with the ladder through-hole, the axis of ladder ring and the axis collineation of control shaft, the pendulum is located the ladder through-hole, the diameter of ladder through-hole down increases in proper order from last

Further, for better realization the utility model discloses, the ladder face of ladder through-hole on be provided with annular and cross section for triangle-shaped's link, the pendulum on be provided with a plurality of and can hang the knot of hanging on the link.

Further, for better realization the utility model discloses, damping device including set up in the shell and have the damping urceolus of through-hole, slide and set up damping pulse pole, the damping valve of setting in the damping urceolus, the damping piston of slide setting in the damping urceolus that is close to deviational survey mechanism one end at the damping urceolus, damping piston and damping pulse pole be located the both ends of damping valve respectively.

Further, for better realization the utility model discloses, damping valve including damping valve body, a plurality of setting damping orifice plate in the valve body through-hole that has the valve body through-hole, set up respectively at the water conservancy diversion seat and the stifled silk at valve body through-hole both ends, set up the backward flow hole on damping valve body, the axis of valve body through-hole parallel with the axis in backward flow hole, the one end that the backward flow hole is close to the water conservancy diversion seat is provided with the damping bobble.

Further, for better realization the utility model discloses, water conservancy diversion seat and damping orifice plate between be provided with the filter screen.

Further, for better realization the utility model discloses, the damping urceolus in be provided with the damping spring who is connected with the transmission of damping piston.

The beneficial effect that this scheme obtained is:

(1) the scheme can realize the function of wireless inclination measurement while drilling, realize the measurement of drilling parameters under the condition of not influencing normal drilling, avoid large construction errors caused by delay of measurement data, and facilitate the timely correction of the errors;

(2) this scheme has advantages such as resistance to compression shock, high temperature resistant, anti low temperature, use cost are low, anti-electromagnetic interference.

Drawings

FIG. 1 is a schematic diagram of the construction of an inclinometer;

FIG. 2 is a schematic structural diagram of a pulse generator;

FIG. 3 is a schematic diagram of the operation of the pulse generator;

FIG. 4 is a schematic structural diagram of a coding control mechanism;

FIG. 5 is a schematic view of the operating state of the encoding control mechanism;

FIG. 6 is a schematic structural view of the inclinometer mechanism;

FIG. 7 is an enlarged view taken at A of FIG. 6;

FIG. 8 is a schematic view of the damper device;

fig. 9 is a schematic structural view of a damping valve body.

Wherein: 51-pulse generating device, 511-pulse ring, 512-throttling ring, 513-throttling hole, 514-pulse valve, 5141-pulse rod, 515-pulse pestle, 516-connecting hole, 52-coding control mechanism, 521-coding base, 522-control cylinder, 523-ball blocking column, 524-control shaft, 525-execution cylinder, 526-steel ball, 527-limiting cylinder, 528-spring, 529-control spring, 53-inclination measuring mechanism, 531-pendulum, 5311-hanging buckle, 532-ladder ring, 5321-hanging ring, 54-damping device 541-damping valve, 542-damping valve, 5421-damping valve body, 5422-guide seat, 5423-damping orifice plate, 5424-blocking wire, 5425-small ball hole and 5426-damping outer cylinder, 5427-filter screen, 543-damping pulse rod, 544-damping piston, 545-damping spring, 55-base, 56-shell.

Detailed Description

The present invention will be described in further detail with reference to the following examples and drawings, but the present invention is not limited thereto.

Example 1:

as shown in fig. 1, in this embodiment, a mechanical inclinometer based on drilling fluid circulation includes a pulse generator 51, a coding control mechanism 52, an inclinometer mechanism 53, a damping device 54 and a base 55 communicated with a drill bit, which are sequentially communicated in a drilling fluid flowing direction, and a casing 56 covering the damping device 54, the inclinometer mechanism 53 and the coding control mechanism 52 is disposed on the base 55. The base 55 is used to provide a mounting base for the installation of the drill bit. The inclination degree of the well is measured by the inclination measuring mechanism 53, the data measured by the inclination measuring mechanism 53 is coded by the coding control mechanism 52, and the code of the coding control mechanism 52 is converted into a pulse signal by the pulse generating device 51 so as to be output.

The inclinometer adopts a mechanical structure, and in the drilling process, measurement while drilling can be realized to detect underground parameters without taking out a drill bit, the work of the drill bit cannot be influenced, the phenomenon of drill sticking is caused, the data acquisition and processing efficiency is improved, the loss caused by data acquisition delay is avoided, the mechanical structure can realize a wireless function, the data acquisition cost is reduced, the error caused by electromagnetic interference is avoided, and the mutual influence of lines such as a data transmission line and the like and the drilling process is avoided.

Mechanical type deviational survey instrument itself also possesses certain intensity and can bear impact, vibration to possess high temperature resistant, anti microthermal function, be favorable to guaranteeing the safety of deviational survey instrument itself, can enlarge the application scope of this scheme. The mechanical inclinometer does not need to use a complex circuit, can shorten the production period and reduce the production and use costs.

Example 2:

as shown in fig. 2 and 3, in the present embodiment, the pulse generator 51 includes a pulse ring 511 communicating with the housing 56, a plurality of throttle rings 512 disposed in the pulse ring 511 and coaxial with the pulse ring 511, a pulse pestle 515 disposed in the pulse ring 511, a pulse rod 5141 disposed in the pulse ring 511 and slidably connected to the pulse pestle 515, and a pulse valve 514 drivingly connected to the pulse rod 5141, wherein the throttle ring 512 has a middle portion provided with a throttle hole 513 coaxial with the pulse ring 511. The pulse generating device 51 is provided with a connecting hole 516 communicated with the drill collar 9.

After the drilling fluid pumped by the pump 1 enters the pulse ring 511, the pulse valve 514 moves downwards under the action of the drilling fluid, when the pulse valve 514 passes through the throttling hole 513, the flowing area of the drilling fluid is changed from large to small and then becomes large, so that positive pressure pulse is generated, the internal pressure of the drilling fluid is also correspondingly changed from large to small and then becomes large, and the change of the pressure value is detected by a sensor. Because the pulse rod 5141 is drivingly connected with the actuating cylinder 525, the actuating cylinder 525 can control the position of the pulse valve 514 in the pulse ring 511 through the pulse rod 5141, so that the drilling fluid passes through different numbers of orifices 513 capable of generating pulses, thereby indicating different well deviation signals by the number of pulse signals.

The well deviation signal can be controlled by a mechanical inclinometer.

As shown in fig. 4 and 5, the encoding control mechanism 52 includes an encoding base 521 disposed in the housing, a control cylinder 522 disposed on the encoding base 521, a limiting cylinder 527 slidably disposed on the control cylinder 522, a control shaft 524 slidably disposed in the control cylinder 522 and passing through the encoding base 521, a plurality of ball blocking columns 523 disposed on the control shaft 524 and having a diameter larger than that of the control shaft 524 and coaxial with the control shaft 524, a plurality of steel balls 526 disposed on the control cylinder 522 and used in cooperation with the ball blocking columns 523, and an actuating cylinder 525 sleeved on the control cylinder 522 and in transmission connection with the pulse rod 5141, wherein the actuating cylinder 525 is in transmission connection with the limiting cylinder 527, a spring 528 is disposed between the limiting cylinder 527 and the encoding base 521, and a control spring 529 is disposed between the ball blocking column 523 and the encoding base 521.

When the actuating cylinder 525 is not subjected to external force, the actuating cylinder 525 and the control shaft 524 extend upwards under the action of the spring 528 and the control spring 529, and the position of the pulse valve 514 in the pulse ring 511 can be controlled by the length of the upward extension of the actuating cylinder 525 due to the transmission connection of the actuating cylinder 525 and the pulse rod 5141 as shown in fig. 5.

As shown in fig. 4, after the pump pumps drilling fluid into the inclinometer, the drilling fluid pushes the pulse valve 514 to move downwards to generate a pulse signal, the pulse valve 514 pushes the actuating cylinder 525 to move downwards through the pulse rod 5141 to compress the spring 528, and after the actuating cylinder 525 is contacted with the control shaft 524, the actuating cylinder 525 pushes the control shaft 524 to move downwards to compress the control spring 529.

The spring 528 and the control spring 529 can enable the structures such as the pulse valve 514, the execution cylinder 525 and the control shaft 524 to automatically reset without influencing the next use, and space is provided for the movement of the structures such as the pulse valve 514, the execution cylinder 525 and the control shaft 524, so that the loss of effect caused by the locking of the structures is avoided.

In this embodiment, the control shaft 524 is provided with a ball blocking column 523 which has a diameter larger than that of the control shaft 524 and is coaxial with the control shaft 524, and a plurality of steel balls 526 which are arranged on the control cylinder 522 and are used in cooperation with the ball blocking column 523. In the process that the control shaft 524 moves upwards, when the ball blocking column 523 moves to the position of the steel ball 526, the ball blocking column 523 pushes the steel ball 526 outwards, the execution cylinder 525 is sleeved on the control cylinder 522, the steel ball 526 cannot fall off and is clamped between the execution cylinder 525 and the control cylinder 522, and the limiting cylinder 527 slidably mounted on the control cylinder 522 is limited by the steel ball 526 and cannot move upwards continuously. The distance between the adjacent ball blocking columns 523 is larger than that between the adjacent steel balls 526, and only one ball blocking column 523 can push out the corresponding steel ball at the same time, so that the distance that the limiting cylinder 527 can move is larger than that of the control shaft 524, and the signal amplification effect is achieved. And the steel ball 526 can be used for positioning and limiting the execution cylinder 525, so that the position of the execution cylinder 525 is kept stable, and the accuracy of measurement is ensured.

The inclination measuring mechanism 53 connected to the bottom of the corresponding control shaft 524 can also limit the position of the control shaft 524, so as to stabilize the control shaft 524 at the corresponding inclination for measurement.

As shown in fig. 6 and 7, the inclinometer 53 includes a pendulum 531 hinged to the bottom end 524 of the control shaft and a step ring 532 disposed in the housing 56 and having a step through hole therein, wherein the axis of the step ring 532 is collinear with the axis of the control shaft 524, the pendulum 531 is located in the step through hole, and the diameter of the step through hole increases from top to bottom.

If a deviation occurs during drilling, the inclinometer follows the drill bit at the same angle of deviation, and the corresponding control shaft 524 and step ring 532 follow the drill bit at the same angle of deviation. Since the pendulum 531 is hinged at the bottom end of the control shaft 524, the pendulum 531 is always kept upright by gravity.

When no drilling fluid impacts, under the action of the control spring 529, the control shaft 524 slides upwards, so that the pendulum 531 is driven to move upwards until the pendulum 531 is hung on a certain step surface of the step ring 532 and cannot move upwards, the control shaft 524 is limited, a certain ball blocking column 523 on the corresponding control shaft 524 moves to the position where the steel ball 526 is located to push out the steel ball 526, the limiting cylinder 527 is limited, the execution cylinder 525 in transmission connection with the limiting cylinder 527 is limited, and the pulse valve 514 in transmission connection with the execution cylinder 525 is kept at a corresponding position in the throttle ring 512. When the pump 1 pumps drilling fluid, the angle of the well deviation can be converted into a pulse signal to be detected.

As shown in fig. 7, on the basis of the above embodiment, in this embodiment, an annular hanging ring 5321 is disposed on the step surface of the step ring 532, the cross section of the hanging ring 5321 is a right triangle, one of the right-angled sides is attached to the step surface of the hanging ring 5321, and the other right-angled side is disposed close to the pendulum 531 and flush with the inner surface of the hanging ring 5321.

The pendulum 531 is provided with a plurality of hanging buckles 5311 which can be hung on the hanging ring 5321. The cross section of the hanging buckle 5311 can be combined with the cross section of the hanging ring 5321 to form a rectangle. The hanging buckles 5311 are uniformly distributed on the surface of the pendulum 531, which can be attached to the hanging ring 5321, in a ring shape by taking the axis of the pendulum 531 as the axis.

When the hanging ring 5321 inclines, the step surface of the hanging ring 5321 also inclines upwards, the pendulum bob 531 is directly hung on the step surface, and when the pendulum bob is vibrated and impacted, the pendulum bob 531 may shake and fall off, thereby affecting the measurement accuracy.

The hanging buckle 5311 can be buckled on the hanging ring 5321, so that the connection strength of the pendulum bob 531 and the stepped ring 532 is improved, the pendulum bob 531 is prevented from falling off under the action of vibration and impact, and the measurement precision is guaranteed. In this embodiment, the angle of one of the oblique angles of the right triangle is less than or equal to 15 °, so as to sequentially reduce the interference of the suspension loop 5321 on the pendulum 531, thereby facilitating the measurement accuracy.

Example 3:

as shown in fig. 8, in addition to the above-mentioned embodiments, in the present embodiment, the damping device 54 includes a damping outer cylinder 541 provided with a through hole and disposed in the housing 56, a damping pulse rod 543 slidably disposed at one end of the damping outer cylinder 541 close to the inclinometer 53, a damping valve 542 disposed in the damping outer cylinder 541, and a damping piston 544 slidably disposed in the damping outer cylinder 541, wherein the damping piston 544 and the damping pulse rod 543 are respectively disposed at two ends of the damping valve 542.

The damping outer cylinder 541 is filled with lubricating oil, and the damping pulse rod 543 tends to move downwards under the action of impact force of drilling fluid. Because the hydraulic oil is incompressible, the pressure in the upper cavity of the damping outer cylinder 541 rises, and when the pressure difference between the upper cavity and the lower cavity is enough to make the hydraulic oil overcome the resistance of the orifice of the damping valve 542, the hydraulic oil starts to flow into the lower cavity from the upper cavity, and the damping pulse rod 543 starts to move downward into the upper sealed cavity. Hydraulic oil entering the lower chamber pushes the damping piston 544 downward.

The damping device 54 can play a role in enabling the pulse valve 514 to move stably and move at a constant speed, and reduces the influence of factors such as the performance and the discharge capacity of drilling fluid, the vibration generated by a pump, the vibration generated by a drill bit and the like on the pulse valve 514, so that the measurement precision and the measurement accuracy are improved, and the interference of the vibration on measurement data is reduced.

In this embodiment, a damping spring 545 in transmission connection with a damping piston 544 is disposed in the damping outer cylinder 541.

The damping spring 545 can reset the damping piston 544, and when the damping pulse rod 543 loses the pressure of the drilling fluid, the damping spring 545 automatically resets the damping piston 544, and the hydraulic oil in the lower cavity is returned and the moving pulse rod is moved upwards.

As shown in fig. 9, the damping valve 542 includes a damping valve body 5421 with a valve body through hole, a plurality of damping orifice plates 5423 disposed in the valve body through hole, a guide seat 5422 and a plug wire 5424 respectively disposed at two ends of the valve body through hole, and a return hole 5425 disposed on the damping valve body 5421, wherein an axis of the valve body through hole is parallel to an axis of the return hole 5425, and one end of the return hole 5425 near the guide seat 5422 is provided with a damping small ball 5426.

In this embodiment, different numbers of damping orifice plates 5423 can be selected as required to obtain different damping effects, and the interchangeability of the structure can be enhanced, and the maintenance and use costs can be reduced. In order to communicate the throttling pores on the plurality of damping pore plates 5423, grooves are formed in two sides of the damping pore plates 5423, the throttling pores are arranged between the two grooves in a penetrating mode, the grooves of the adjacent damping pore plates 5423 can be communicated with each other, the adjacent throttling pores can be communicated with each other, the throttling pores are eccentrically arranged, the adjacent throttling pores are arranged in a staggered mode, the overall length of the throttling pores can be increased, the effect of enhancing the damping effect is achieved, and the throttling pores can be prevented from being blocked.

In this embodiment, a filter screen 5427 is disposed between the flow guide seat 5422 and the damping hole plate 5423. The filter screen 5427 is mainly used for filtering lubricating oil, so that impurities in the lubricating oil are prevented from entering the throttling small holes to cause blockage. In this embodiment, other undescribed contents are the same as those in the above embodiment, and thus are not described again.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and the technical spirit of the present invention is within the spirit and principle of the present invention, and any simple modification, equivalent replacement, and improvement made to the above embodiments are all within the protection scope of the technical solution of the present invention.

Claims (5)

1. A mechanical inclinometer based on drilling fluid circulation is characterized in that: the drilling fluid inclination measuring device comprises a pulse generating device (51), a coding control mechanism (52), an inclination measuring mechanism (53), a damping device (54) and a base (55) communicated with a drill bit (6), wherein the pulse generating device, the coding control mechanism (52), the inclination measuring mechanism (53), the damping device (54) and the base (55) are sequentially communicated in the drilling fluid flowing direction, and a shell (56) for coating the damping device (54), the inclination measuring mechanism (53) and the coding control mechanism (52) is arranged on the base (55; the pulse generating device (51) comprises a pulse ring (511) communicated with a shell (56), a plurality of throttling rings (512) arranged in the pulse ring (511) and coaxial with the pulse ring (511), a pulse pestle (515) arranged in the pulse ring (511), a pulse rod (5141) positioned in the pulse ring (511) and connected with the pulse pestle (515) in a sliding way, and a pulse valve (514) in transmission connection with the pulse rod (5141), wherein the middle part of the throttling ring (512) is provided with a throttling hole (513) coaxial with the pulse ring (511); the coding control mechanism (52) comprises a coding base (521) arranged in the shell, a control barrel (522) arranged on the coding base (521), a limiting barrel (527) arranged on the control barrel (522) in a sliding manner, a control shaft (524) arranged in the control barrel (522) in a sliding manner and penetrating through the coding base (521), a plurality of ball blocking columns (523) which are arranged on the control shaft (524) and have diameters larger than that of the control shaft (524) and are coaxial with the control shaft (524), a plurality of steel balls (526) which are arranged on the control barrel (522) and are matched with the ball blocking columns (523), an execution barrel (525) which is sleeved on the control barrel (522) and is in transmission connection with the pulse rod (5141), and the execution barrel (525) is in transmission connection with the limiting barrel (527), a spring (528) is arranged between the limiting cylinder (527) and the coding base (521), a control spring (529) is arranged between the ball blocking column (523) and the coding base (521); the inclination measuring mechanism (53) comprises a pendulum bob (531) hinged to the bottom end of the control shaft (524) and a stepped ring (532) arranged in the shell (56) and internally provided with a stepped through hole, the axis of the stepped ring (532) is collinear with the axis of the control shaft (524), the pendulum bob (531) is positioned in the stepped through hole, and the diameters of the stepped through holes are sequentially increased from top to bottom; the ladder surface of the ladder through hole is provided with an annular hanging ring (5321) with a triangular cross section, and the pendulum bob (531) is provided with a plurality of hanging buckles (5311) capable of being hung on the hanging ring (5321).

2. The mechanical inclinometer based on the drilling fluid circulation of claim 1, characterized in that: the damping device (54) comprises a damping outer cylinder (541) which is arranged in a shell (56) and is provided with a through hole, a damping pulse rod (543) which is arranged at one end, close to the inclination measuring mechanism (53), of the damping outer cylinder (541) in a sliding mode, a damping valve (542) which is arranged in the damping outer cylinder (541) in a sliding mode, and a damping piston (544) which is arranged in the damping outer cylinder (541) in a sliding mode, wherein the damping piston (544) and the damping pulse rod (543) are located at two ends of the damping valve (542) respectively.

3. The mechanical inclinometer based on the drilling fluid circulation of claim 2, characterized in that: damping valve (542) including damping valve body (5421) that has the valve body through-hole, a plurality of setting damping orifice plate (5423) in the valve body through-hole, set up water conservancy diversion seat (5422) and stifled silk (5424) at valve body through-hole both ends respectively, set up backward flow hole (5425) on damping valve body (5421), the axis of valve body through-hole be parallel with the axis of backward flow hole (5425), one end that backward flow hole (5425) are close to water conservancy diversion seat (5422) is provided with damping bobble (5426).

4. The mechanical inclinometer based on the drilling fluid circulation of claim 3, characterized in that: a filter screen (5427) is arranged between the flow guide seat (5422) and the damping pore plate (5423).

5. The mechanical inclinometer based on the drilling fluid circulation of claim 3, characterized in that: and a damping spring (545) in transmission connection with a damping piston (544) is arranged in the damping outer cylinder (541).

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