CN106089185B - Pulse generating unit, drilling rod rubber plug intelligent positioning system and method - Google Patents
Pulse generating unit, drilling rod rubber plug intelligent positioning system and method Download PDFInfo
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- CN106089185B CN106089185B CN201610460051.1A CN201610460051A CN106089185B CN 106089185 B CN106089185 B CN 106089185B CN 201610460051 A CN201610460051 A CN 201610460051A CN 106089185 B CN106089185 B CN 106089185B
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000005553 drilling Methods 0.000 title abstract description 11
- 230000005540 biological transmission Effects 0.000 claims abstract description 58
- 230000007246 mechanism Effects 0.000 claims abstract description 19
- 239000012530 fluid Substances 0.000 claims abstract description 18
- 238000004364 calculation method Methods 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 12
- 230000003750 conditioning effect Effects 0.000 claims description 10
- 238000006073 displacement reaction Methods 0.000 claims description 9
- 238000004891 communication Methods 0.000 claims description 6
- 230000002238 attenuated effect Effects 0.000 claims description 3
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- 230000008859 change Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
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- 230000008878 coupling Effects 0.000 description 2
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Classifications
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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
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/134—Bridging plugs
-
- 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
- E21B47/06—Measuring temperature or pressure
-
- 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
- E21B47/09—Locating or determining the position of objects in boreholes or wells, e.g. the position of an extending arm; Identifying the free or blocked portions of pipes
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Abstract
The present invention provides the pulse generating unit applied in one of liner completion process drilling rod rubber plug intelligent positioning, the pulse generating unit includes beater mechanism；Motor, the motor connect striking cover plate by transmission mechanism, and are able to drive striking cover plate and at least pump, so that striking cover plate and surrounding fluid interaction and generating pressure wave；Shell, the motor and at least part of transmission mechanism are installed in the shell.Use can be conveyed jointly with drilling rod rubber plug, during transportation, striking cover plate constantly generates continuous pressure pulse wave with the fluid of surrounding under longitudinal reciprocating motion, it forms continuous, real-time pulse signal to acquire for pressure sensor, the case where existing bruising is unobvious when this continuous working method can be to avoid well cementing impact pressure or bruising is failed.The present invention also provides drilling rod rubber plug intelligent positioning systems and method comprising the device.
Description
Technical Field
The invention relates to the technical field of drilling, in particular to a pulse generator, and provides an intelligent positioning system for a rubber plug of a drill rod with the pulse generator and a positioning method using the system.
Background
The tail pipe impact type well completion technology plays an important role in the current well cementation construction, and is advocated because the construction is simple and convenient and an inner pipe column or a drift drilling plug is not required. However, with the increase of the well depth, in the construction process, because the collision pressure is not obvious, whether the collision pressure rubber plug really reaches the bottom or not can not be correctly judged, engineering accidents such as less replacement of the collision pressure rubber plug, more replacement of the collision pressure rubber plug and the like frequently occur, and the risk is brought to the whole well cementation construction.
Chinese patent CN202338336U provides a signal rubber plug for a bump-press type well completion process, which utilizes tail pipe bump-press type well completion technology to realize secondary bump-press in the well by the unique structure of the device. This patent has realized feeding back pressure signal to ground, judges mud displacement liquid measure for constructor and provides certain foundation. However, the patent cannot generate continuous pressure signals, so that the position of the rubber plug in the well cannot be monitored in real time, and the defect that the conventional deep well and ultra-deep well tail pipe cementing well is not obvious in collision pressure or is not in collision pressure is overcome to a certain extent.
"Yang surpass. resonance plug monitor control system [ D ]. Xian: the university of western's technology, 2013, "discloses a resonant plug monitoring and control system, the device of which can be recycled after the completion of the well cementation work, read the information stored therein, and understand the working process of the plug in the well. However, the design needs to be established on the premise that the well cementation work is normally carried out, and the working process of the rubber plug under the well can only be obtained after the work is finished, so that the actual state of the rubber plug under the well cannot be known immediately, and the special situation encountered in the well cementation work cannot be solved.
Disclosure of Invention
Some known intelligent drilling rod rubber plug positioning systems can not generate continuous pressure signals, so that the position of the rubber plug in a well can not be monitored in real time, the problem that the rubber plug is not obviously pressed or is not pressed can not be completely solved, and other known intelligent drilling rod rubber plug positioning devices can read actual state information of the rubber plug in the well after well cementation work is finished.
The present invention has been made to solve at least part of the above problems, and can be implemented as the following embodiments.
In a first aspect, an embodiment of the present invention provides a pulse generator for intelligently positioning a rubber plug of a drill pipe, where the pulse generator includes
An impact section;
the motor is connected with the impact part through the transmission mechanism and can drive the impact part to do reciprocating motion at least up and down so as to enable the impact part to interact with surrounding fluid and generate pressure waves;
a housing, the motor and at least a portion of the transmission being mounted within the housing.
Optionally or preferably, the transmission mechanism comprises:
a crank-link mechanism configured to convert rotational motion into longitudinal reciprocating motion under the drive of the motor.
Alternatively or preferably, the crank-link mechanism comprises
A first rotating shaft configured to rotate by the driving of the motor;
the first pin shaft is arranged at the non-axial center of the end part of the first rotating shaft, so that the first rotating shaft drives the first pin shaft to do circular motion when rotating;
the upper end of the pushing part penetrates out of the shell and is connected with the impact part;
one end of the connecting rod is sleeved on the first pin shaft, and the other end of the connecting rod is connected with the pushing portion through the second pin shaft so as to drive the pushing portion to push the impact portion to do reciprocating motion.
Alternatively or preferably, the motor is located at a lower portion in the housing with an output shaft of the motor facing upward, and the crank link mechanism includes
The first rotating shaft and the second rotating shaft are mutually staggered, and the second rotating shaft is driven by a motor and is associated with the first rotating shaft through a transmission assembly so as to change the transmission direction;
the first pin shaft is arranged at the non-axial center of the end part of the first rotating shaft, so that the first rotating shaft drives the first pin shaft to do circular motion when rotating;
the upper end of the pushing part penetrates out of the shell and is connected with the impact part;
one end of the connecting rod is sleeved on the first pin shaft, and the other end of the connecting rod is connected with the pushing portion through the second pin shaft so as to drive the pushing portion to push the impact portion to do reciprocating motion.
Optionally or preferably, the pushing part is rod-shaped, one end of the rod penetrates through a hole in the upper part of the shell and is connected with the impact part, and the second pin shaft is arranged at the other end of the rod.
Alternatively or preferably, the transmission assembly is a bevel gear set, a hypoid gear set, an interleaved bevel gear set or a worm gear.
Optionally or preferably, the pushing part is rod-shaped, one end of the rod penetrates through a hole in the upper part of the shell and is connected with the impact part, and the other end of the rod is connected with the connecting rod through the second pin shaft.
Alternatively or preferably, the impact portion is of a flat configuration.
Optionally or preferably, the pulse generating device further comprises a sealing device arranged at a position of the shell where the pushing part penetrates out.
The pulse generating device for intelligently positioning the drill rod rubber plug can be jointly conveyed and used along with the drill rod rubber plug, continuous pressure waves are continuously generated between the impact part and surrounding fluid under longitudinal reciprocating motion in the conveying process, continuous and real-time pulse signals are formed and are collected by the pressure sensor, and the condition that the collision pressure is not obvious or the collision pressure fails when the collision pressure is limited can be avoided by the continuous working mode.
In a second aspect, an embodiment of the present invention provides an intelligent positioning system for a rubber plug of a drill pipe, where the pulse generating device provided in the first aspect, the pressure sensor, the signal conditioning unit, the a/D converter, and the computing unit are provided;
the pressure sensor detects pressure waves generated by the pulse generating device and is in communication connection with the signal conditioning unit;
the signal conditioning unit is in communication connection with the A/D converter and conditions the characteristic parameters of the signals to be within a range which can be received by the A/D converter, so that the A/D converter converts the analog signals of the pressure waves into digital signals;
and the calculation unit is in communication connection with the A/D converter and calculates the conveying distance of the rubber plug of the drill rod according to the received pressure wave pulse signal.
Continuous pulse signals sent by the pulse generating device are received through the pressure sensor, the signals are conditioned and converted through the signal conditioning unit and the A/D converter, and the conveying distance of the rubber plug of the drill rod can be obtained in real time after the signals are calculated through the calculating unit according to a certain formula.
In a third aspect, an embodiment of the present invention provides an intelligent positioning system using the drill rod rubber plug described in the second aspect, further including
Calculating a transmission speed c:
the transmission speed c is obtained by the following formula:
calculating an attenuation factor L according to the transmission speed:
the attenuation factor L is obtained by the following formula:
calculating the conveying distance of the rubber plug of the drill rod according to the attenuation factor and the intensity of the pulse signal, wherein the calculation formula is as follows:
wherein,
the meaning of each symbol is:
c, the viscous frequency transmission speed of the pulse signal, wherein the unit is m/s;
c0-the time domain transmission speed of the pulse signal in m/s;
Rf-average coefficient of hydraulic friction, dimensionless;
omega-pulse angular frequency of continuous wave pulse generator;
rho is the density of the displacement liquid, and the unit is kg/m;
ρg-density of gas in kg/m;
ρ1-the density of the liquid in kg/m;
βgvolume gas fraction in m3/m3；
Kg-the bulk modulus of elasticity of the gas in Pa;
K1-the bulk modulus of elasticity of the liquid in Pa;
e-modulus of elasticity of the pipe, in Pa;
e-the inner diameter of the pipe in m;
d, the wall thickness of the pipeline, and the unit is m;
μ0-poisson's ratio of the pipe;
mu-viscosity of the displacement fluid in Pa · s.
p is the intensity of the pulse signal, and the unit is Pa;
p0-initial strength of the pulse signal in Pa;
x is the transmission distance in m;
l-attenuation factor, i.e. the transmission distance at which the pulse signal is attenuated to 1/e of the initial intensity, is given in m.
In the calculation process, the invention improves the viscosity-frequency transmission model, namely, the viscosity and the pulse frequency of a transmission medium are considered by utilizing the attenuation of a pulse signal, and a more comprehensive and accurate channel transmission model is provided according to the solid-free characteristic of a transmission channel, so that the transmission distance is calculated more accurately.
Drawings
Fig. 1 is a schematic front view of a pulse generator according to an embodiment of the present invention;
FIG. 2 is a schematic side view of a pulse generator according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an intelligent positioning system for a rubber plug of a drill pipe according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a computing unit according to an embodiment of the present invention;
fig. 5 is a flowchart of a method for positioning a conveying distance of a drill rod rubber plug according to an embodiment of the present invention.
In the figure:
1-an impact portion; 2-a plug body; 3-a pushing part; 4-a housing; 5-a coupler; 6-a linker; 7-shaft seat; 8-a first rotating shaft; 9-a connecting rod; 10-a first pin; 11-a first bevel gear; 12-a second bevel gear; 13-a motor; 14-a second shaft; 15-a pressure sensor; 16-a signal conditioning unit; 17-a/D converter; 18-a calculation unit; 61-a second pin; 180-a central processing unit; 181-memory.
Detailed Description
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Interpretation of terms:
water hammer (water hammer): in a pressure pipeline, the phenomenon of significant, repeated and rapid change of instantaneous pressure, which is called water hammer, is caused by the rapid change of the liquid flow rate. The generated pressure waves can travel a significant distance in the flow conduit.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be taken as limiting the scope of the present invention.
In the description of the present invention, it should be understood that the terms "first", "second", "third", and "fourth" are used to define the components, and are used only for the convenience of distinguishing the components, and if not otherwise stated, the terms have no special meaning, and thus, should not be construed as limiting the scope of the present invention.
Fig. 1 and 2 are schematic views showing the structure of an impulse generating device provided in an embodiment of the present invention, which is mainly composed of an impact portion 1, a motor 13, a transmission mechanism, and a housing 4. The motor 13 is connected to the impact portion 1 through a transmission mechanism so that the impact portion 1 can reciprocate in the up-down direction.
In the using process of the pulse generating device, the pulse generating device is conveyed along with a drill rod rubber plug in the underground, the whole pulse generating device is immersed in fluids such as drilling fluid, displacement fluid and the like, and therefore, in order to ensure the normal work of the motor 13 and the transmission mechanism, the motor 13 and at least a part of the transmission mechanism are installed in the shell 4. A further part of the transmission mechanism needs to reciprocate between the external environment and the inner space of the housing 4. In the event that the well is too deep, the pulse generating device may operate in a high pressure fluid environment, and so in some embodiments the housing 4 may be made of a material known to be pressure resistant.
The transmission mechanism can be realized in various ways as long as the longitudinal reciprocating motion of the impact part 1 can be ensured. Hereinafter, a crank link mechanism is taken as an example, and two matching modes of the transmission mechanism and the motor 13 are provided.
In the first fitting manner, the motor 13 is mounted at the lower portion of the housing 4, for example, a motor base is fixed at the lower portion of the housing 4, and the motor 13 is mounted on the motor base. The output shaft of the motor 13 faces upward. The transmission mechanism comprises a first rotating shaft 8 and a second rotating shaft 14 which are arranged in a staggered mode, wherein the second rotating shaft 14 can be an output shaft of the motor 13 or a rotating shaft arranged on the output shaft. The angle of the both can be designed according to the shape and the inner space of the housing 4, and the angle of the both is 90 ° in this embodiment. The first shaft 8 may be mounted in position on the side wall of the housing 4 by means of a shaft socket 7, and the second shaft 14 is driven by a motor 13 and is associated with the first shaft 8 by means of a transmission assembly. The transmission assembly can be realized in various ways as long as the transmission direction can be changed. For example, in the present embodiment, the transmission assembly may be a bevel gear set, and the bevel gear set is composed of a first bevel gear 11 and a second bevel gear 12, wherein the second bevel gear 12 is sleeved on the second rotating shaft 14, and the first bevel gear 11 is sleeved on the first rotating shaft 8. The first bevel gear 11 and the second bevel gear 12 are meshed with each other at an angle of 90 °. Thus, when the motor 13 is operated, the second bevel gear 12 rotates the first bevel gear 11, thereby changing the transmission direction. In other embodiments, the transmission assembly can also adopt a hyperboloid gear set, an alternate shaft bevel gear set or a worm gear and worm and the like which can realize alternate shaft transmission. The first pin 10 is disposed at a non-axial center of the first rotating shaft 8, for example, may be disposed at an edge position of an end portion of the first rotating shaft 8, so that when the first rotating shaft 8 operates, the first pin 10 makes a uniform circular motion around the axial center of the first rotating shaft 8. The transmission mechanism further comprises a connecting rod 9, one end of the connecting rod 9 is sleeved on the first pin shaft 10, the other end of the connecting rod 9 is connected with the pushing portion 3 through a second pin shaft 61, in the embodiment, the lower end of the pushing portion 3 is provided with a joint 6, the joint 6 is of a groove-shaped structure with a concave cross section, holes corresponding to the positions are formed in the side wall of the groove-shaped structure, the second pin shaft 61 penetrates through the two holes, and the connecting rod 9 is connected to the middle of the second pin shaft 61, so that the connecting rod 9 is in pin connection with the pushing portion 3. The end of the pushing part 3 away from the second pin 61 is passed out of a hole at the top of the housing 4 and connected to the impact part 1. The pushing part 3 can be realized in various ways, and in this embodiment, is a push rod. When the motor 13 is started, the first pin shaft 10 makes a circular motion, and drives the pushing part 3 to move through the connecting rod 9, and under the limitation of the shell 4, the pushing part 3 pushes the impact part to make a reciprocating motion in the vertical direction. In some cases, the push rod is susceptible to radial forces from the housing or vibrations, resulting in a decrease in the stability of the push rod operation. This effect is more pronounced especially when the push rod is too long, so that in some embodiments the push rod may be divided into upper and lower parts, which are connected by a coupling 5 to distribute the radial forces of the parts. In the embodiment, the coupling 5 is disposed at a lower portion of the push rod, which is close to the second pin 61, so that a sufficient length is left for the push rod and the impact portion 1 to reciprocate, interaction between the impact portion and surrounding fluid is enhanced, and stability of the push rod during operation is ensured.
The second engagement is different from the first engagement in that the transmission assembly and the second shaft 14 are omitted and the motor 13 is directly in driving connection with the first shaft 8. At this time, the motor 13 is mounted on the side wall of the outer part 4 through a motor base, and the output shaft of the motor 13 faces the horizontal direction. This type of fitting is simple in construction, but results in the center of gravity of the device being on the motor side, which affects the balance of the device, and on the other hand, because the motor 13 is mounted on the side wall, the occupied space in the horizontal direction is increased, which may not be suitable for drilling a well with a narrow diameter.
The impact part 1 is used for continuously sending impact and collision with surrounding fluid (such as drilling fluid, displacement fluid and the like) in reciprocating motion to generate continuous pressure waves, and the working mode is similar to the water hammer principle based on the foregoing, namely the generated pressure waves can be transmitted in a long distance in a liquid flow pipeline, so that the generated pressure wave signals are continuous and can be acquired by a pressure sensor on the earth surface or close to the earth surface in real time. The shape and structure of the impact part 1 can be implemented in various ways, preferably in a flat structure, so that the action area of the impact part 1 and the fluid can be increased, and the generated pressure wave pulse is more obvious, in this embodiment, the impact part 1 adopts a disc-shaped structure to form an impact cover plate.
In order to avoid the fluid from entering the inside of the housing 4 through the gap between the housing 4 and the pushing part 3, in some embodiments, a sealing device may be further disposed between the housing 4 and the impact part 1, in this embodiment, the sealing device is a hollow plug body 2 (which may be made of rubber) disposed on the upper surface of the housing, and the pushing part 3 penetrates through the middle space of the plug body 2, so as to avoid the external fluid from entering the housing.
Next, an intelligent positioning system for a drill pipe rubber plug is provided, as shown in fig. 3, which may include the pulse generating device of any of the above embodiments. The system further comprises a pressure sensor 15, a signal conditioning unit 16, an a/D converter 17 and a calculation unit 18, which are in turn communicatively connected.
The pressure sensor 15 is located at or near the surface of the earth to acquire the continuous pressure wave signal transmitted by the pulse generating device. In some embodiments, the pressure sensor 15 may employ a 3100 series compact high pressure OEM pressure transmitter available from Gems jimmy, usa as the sensor.
The signal conditioning unit 16 is configured to condition the signal received by the pressure sensor 15, such as amplitude, frequency, phase, etc. of the signal, so as to condition the signal within an acceptable range of the a/D converter 17, and then send the signal to the computing unit 18 through the a/D converter 17.
As shown in fig. 4, the calculation unit 18 may be constituted by a microcomputer including a central processing unit 180 and a memory 181, and programs for signal denoising processing, feature extraction, and transmission distance calculation (described later) are written in the memory 181 and executed by the central processing unit 180 to implement the functions in the embodiment of the present invention. Wherein, the signal denoising processing can adopt a wavelet transform mode. The calculation unit 18 may also have suitable display devices to display the pre-denoising waveform, the denoised waveform and the calculated plug conveying distance in real time.
A method for calculating the conveying distance of the rubber plug is provided below, please refer to fig. 5, and the method includes the following steps:
s1: calculating a transmission speed c:
the transmission speed c is obtained by the following formula:
s2: calculating an attenuation factor L according to the transmission speed:
the attenuation factor L is obtained by the following formula:
according to the following formula
The attenuation factor L can be obtained, i.e.
In the formula, to thick-walled pipe, the influence of pipe wall circumference stress inhomogeneity need be considered, influence factor when the pipeline is only fixed in the upper end is:
s3: calculating the conveying distance of the rubber plug of the drill rod according to the attenuation factor and the intensity of the pulse signal, wherein the calculation formula is as follows:
wherein the meaning of each symbol is:
c, the viscous frequency transmission speed of the pulse signal, wherein the unit is m/s;
c0-the time domain transmission speed of the pulse signal in m/s;
Rf-average coefficient of hydraulic friction, dimensionless;
omega-pulse angular frequency of continuous wave pulse generator;
rho is the density of the displacement liquid, and the unit is kg/m;
ρg-density of gas in kg/m;
ρ1-the density of the liquid in kg/m;
βgvolume gas fraction in m3/m3；
Kg-the bulk modulus of elasticity of the gas in Pa;
K1-the bulk modulus of elasticity of the liquid in Pa;
e-modulus of elasticity of the pipe, in Pa;
e-the inner diameter of the pipe in m;
d, the wall thickness of the pipeline, and the unit is m;
μ0-poisson's ratio of the pipe;
mu-viscosity of the displacement fluid in Pa · s.
p is the intensity of the pulse signal, and the unit is Pa;
p0-initial strength of the pulse signal in Pa;
x is the transmission distance in m;
l-attenuation factor, i.e. the transmission distance at which the pulse signal is attenuated to 1/e of the initial intensity, is given in m.
In the calculation method, a viscosity-frequency transmission model is improved, namely, the viscosity and the pulse frequency of a transmission medium are considered by utilizing the attenuation of a pulse signal, and a more comprehensive and accurate channel transmission model is provided according to the solid-free characteristic of a transmission channel, so that the calculation result is more accurate.
The pulse generating device, the intelligent positioning system and the intelligent positioning method for the rubber plug of the drill rod are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the core concepts of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (1)
1. The intelligent positioning method for the rubber plug of the drill rod is characterized in that an intelligent positioning system for the rubber plug of the drill rod is used, and the intelligent positioning system for the rubber plug of the drill rod comprises a pulse generating device, a pressure sensor (15), a signal conditioning unit (16), an A/D converter (17) and a calculating unit (18);
the pulse generating device includes:
an impact section (1);
the motor (13) is connected with the impact part (1) through a transmission mechanism and can drive the impact part (1) to do reciprocating motion at least up and down so that the impact part (1) interacts with liquid around the impact part and generates pressure waves; and
a housing (4), said motor (13) and at least a portion of said transmission being mounted within said housing (4); the impact part (1) is located outside the housing (4);
the pressure sensor (15) detects pressure waves generated by the pulse generating device and is in communication connection with the signal conditioning unit;
the signal conditioning unit (16) is in communication connection with the A/D converter (17) and conditions the characteristic parameters of the signals to be within the range receivable by the A/D converter (17) so that the A/D converter (17) converts the analog signals of the pressure waves into digital signals;
the calculation unit (18) is in communication connection with the A/D converter (17), and calculates the conveying distance of the rubber plug of the drill rod according to the received pressure wave pulse signal;
the method further comprises the following steps:
calculating a transmission speed c:
the transmission speed c is obtained by the following formula:
calculating an attenuation factor L according to the transmission speed:
the attenuation factor L is obtained by the following formula:
calculating the conveying distance of the rubber plug of the drill rod according to the attenuation factor and the intensity of the pulse signal, wherein the calculation formula is as follows:
wherein,
the meaning of each symbol is:
c, the viscous frequency transmission speed of the pulse signal, wherein the unit is m/s;
c0-the time domain transmission speed of the pulse signal in m/s;
Rf-average coefficient of hydraulic friction, dimensionless;
omega-pulse angular frequency of continuous wave pulse generator;
rho is the density of the displacement liquid, and the unit is kg/m;
βgvolume gas fraction in m3/m3；
Kg-the bulk modulus of elasticity of the gas in Pa;
K1-the bulk modulus of elasticity of the liquid in Pa;
e-modulus of elasticity of the pipe, in Pa;
e-the inner diameter of the pipe in m;
d, the wall thickness of the pipeline, and the unit is m;
μ0-poisson's ratio of the pipe;
mu-viscosity of the displacement fluid in Pa.s;
p is the intensity of the pulse signal, and the unit is Pa;
p0-initial strength of the pulse signal in Pa;
x is the transmission distance in m;
l-attenuation factor, i.e. the transmission distance at which the pulse signal is attenuated to 1/e of the initial intensity, is given in m.
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| CN108150131B (en) * | 2018-02-12 | 2023-10-20 | 中国地质大学（北京） | Pressure wave generator for positioning and well cementation device |
| CN108590572B (en) * | 2018-02-12 | 2023-12-12 | 中国地质大学（北京） | Negative pulse pressure wave generator and well cementation device |
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| CN103032422A (en) * | 2012-11-22 | 2013-04-10 | 裕东（中山）机械工程有限公司 | Pulse gas generator driven by straight line reciprocating mechanism |
| CN103711476A (en) * | 2012-09-28 | 2014-04-09 | 罗斯蒙德公司 | Detection of position of a plunger in a well |
| CN205172569U (en) * | 2015-10-30 | 2016-04-20 | 中石化石油工程技术服务有限公司 | Positive impulse generator of linear electric motor driven continuous wave |
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| CN102400680A (en) * | 2010-09-13 | 2012-04-04 | 昆山中慈工控科技开发有限公司 | Piston type negative-pressure pulse wave generation and detection device |
| CN103225505B (en) * | 2013-04-28 | 2016-01-13 | 东营紫贝龙石油科技有限责任公司 | A kind of high velocity mud impulse generator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103711476A (en) * | 2012-09-28 | 2014-04-09 | 罗斯蒙德公司 | Detection of position of a plunger in a well |
| CN103032422A (en) * | 2012-11-22 | 2013-04-10 | 裕东（中山）机械工程有限公司 | Pulse gas generator driven by straight line reciprocating mechanism |
| CN205172569U (en) * | 2015-10-30 | 2016-04-20 | 中石化石油工程技术服务有限公司 | Positive impulse generator of linear electric motor driven continuous wave |
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