An adaptive large-displacement mud pulser and its adaptive method

Abstract

The present application discloses an adaptive large-displacement mud pulser and an adaptive method thereof, wherein the mud pulser comprises a pulser body and a valve group, wherein the body is provided with an action monitor, a motor, a reducer, and a transmission shaft, wherein the action monitor comprises a current monitoring module, an angle monitoring module, a processing module, a feedback module, and a storage module, wherein a preset current value and a preset angle value are stored in the storage module; the valve group comprises a rotor and a stator, wherein the rotor is provided with blades, and the stator is provided with a flow hole, and when the transmission shaft is driven to rotate, the rotor rotates with the transmission shaft, so that the blades thereon realize the opening or closing of the flow hole; the action monitor can monitor the working current of the pulser and the rotation angle of the rotor in real time, the processing module can compare the angle value with the preset angle value, and the feedback module can adjust the working current of the pulser or the rotation angle of the rotor. The mud pulser provided by the present application can adaptively adjust the action in a large-displacement mud environment.

Description

Technical Field

[0001] The present application relates to the technical field of downhole measuring instruments for oil drilling, and in particular to an adaptive large-displacement mud pulser and an adaptive method thereof. Background Art

[0002] The mud pulser is the most important part of the wireless drilling instrument. It is used in the underground mud environment with high temperature, high pressure and strong vibration. It requires strong adaptability, high reliability, good signal quality and simple maintenance. The poor pulse signal quality of the mud pulser will cause errors in the uploaded data; poor reliability will lead to the drilling of the drill due to instrument failure, increasing the drilling cost. At present, the mud pump with fast flow rate and large displacement is generally used for drilling and production in the oil drilling process. The working displacement can reach up to 80L / s. In the large displacement mud environment, the use of QDT pulser is prone to the problem of key release. Although the use of rotary valve pulser can avoid key release, the pulser has a large workload and is prone to damage. At the same time, due to the large fluctuation of working displacement during large displacement drilling, the pulser is easily damaged.

[0003] Therefore, the existing mud pulser is difficult to adapt to the large-displacement mud environment, and it is urgent to propose a new technical solution to solve the problems existing in the existing technology. Summary of the invention

[0004] The present application provides an adaptive large-displacement mud pulser and an adaptive method thereof, so as to solve the problem that the existing mud pulser is difficult to adapt to the large-displacement mud environment.

[0005] In order to achieve the above objectives, this application provides the following technical solutions:

[0006] On the one hand, the present application provides an adaptive large-displacement mud pulser, including a pulser body, on which an action monitor, a motor, a reducer connected to the motor shaft of the motor, and a transmission shaft connected to the output shaft of the reducer are arranged, the action monitor includes a current monitoring module, an angle monitoring module, a processing module, a feedback module and a storage module, and the storage module stores a preset current value and a preset angle value;

[0007] It also includes a valve group, the valve group includes a rotor and a stator, the rotor is provided with blades, the stator is provided with a flow hole, the transmission shaft is connected to the rotor, when the transmission shaft is driven to rotate, the rotor rotates with the transmission shaft, so that the blades on it can realize the opening or closing of the flow hole;

[0008] The current monitoring module realizes real-time monitoring of the working current of the pulser, and the angle monitoring module realizes real-time monitoring of the rotation angle of the rotor. The processing module compares the angle value received from the angle monitoring module with the preset angle value, and outputs a signal to the feedback module according to the comparison result. The feedback module adjusts the working current of the pulser or the rotation angle of the rotor according to the signal, so that the working current of the pulser is less than the preset current value.

[0009] The above technical solution further comprises that the valve group also comprises a valve group housing, one end of the valve group housing is provided with a through hole allowing the transmission shaft to pass through, and the other end forms a mounting seat adapted to the salvage head, the rotor and the stator are mounted in the valve group housing, and a stator fixture is provided on the valve group housing, one end of the stator fixture is connected to the stator, and the other end is connected to the salvage head; the stator fixture is fixedly connected to the valve group housing by bolts.

[0010] Furthermore, the rotor is provided with a plurality of blades, the stator is provided with a plurality of flow holes, and the blades correspond to the flow holes one by one; the stator is fixedly connected to the valve group housing through a stator fixer and pins.

[0011] Furthermore, a control circuit structure for driving the motor to rotate is also arranged on the main body.

[0012] Furthermore, the current monitoring module of the action monitor includes a current sensor, and the current monitoring module monitors the working current of the pulser in real time through the current sensor to obtain a current signal representing the working current of the pulser.

[0013] Furthermore, the angle monitoring module includes an angle sensor, and the angle monitoring module monitors the rotation angle of the rotor in real time through the angle sensor to obtain an angle signal representing the rotation angle of the rotor.

[0014] Furthermore, the processing module includes an analog-to-digital conversion unit, and the processing module converts the current signal and the angle signal into a current value and an angle value through the analog-to-digital conversion unit.

[0015] Furthermore, the processing module further includes a processing unit, which obtains a preset current value and a preset angle value from the storage module, and compares the current value and the angle value with the preset current value and the preset angle value respectively;

[0016] When the angle value is less than the preset angle value, the processing unit determines that the pulser load is too large, and the processing unit outputs a control signal to the feedback module. The feedback module adjusts the motor action through the control circuit structure so that the rotor is driven to rotate to reduce the rotation angle of the rotor and reduce the shielding area of ​​the blade on the flow hole; when the current monitoring module detects that the working current value of the pulser is less than the preset current value, the feedback module completes the adjustment of the rotation angle of the rotor.

[0017] When the angle value is equal to the preset angle value and the current value is greater than the preset current value, the processing unit determines that the pulser load is too large, and the processing unit outputs a control signal to the feedback module, and the feedback module limits the working current of the pulser according to the control signal;

[0018] When the current monitoring module detects that the operating current value of the pulser is less than the preset current value, the feedback module completes the adjustment of the operating current of the pulser.

[0019] Furthermore, the preset current value is 2.5A; and the preset angle value is 45°.

[0020] Furthermore, the rotor reciprocates with the central axis of the transmission shaft as the rotation center to open or close the corresponding flow hole.

[0021] On the other hand, the present application provides an adaptive method for a mud pulser to large displacement mud, wherein the mud pulser is the above-mentioned adaptive large displacement mud pulser, and the adaptive method comprises:

[0022] The rotation angle of the rotor of the pulser valve group is monitored in real time through the action monitor on the pulser body;

[0023] The working current of the pulser is monitored in real time through the action monitor;

[0024] When the motion monitor detects that the rotation angle of the rotor is less than the preset angle value, the motion monitor adjusts the rotation angle of the rotor until the motion monitor detects that the working current of the pulser is less than the preset current value;

[0025] When the action monitor detects that the rotation angle of the rotor is equal to the preset angle value and the operating current of the pulser is greater than the preset current value, the action monitor adjusts the operating current of the pulser until the operating current of the pulser is less than the preset current value.

[0026] Compared with the prior art, this application has the following beneficial effects:

[0027] The adaptive large-displacement mud pulser provided by the present application is used in the measurement while drilling process, and can upload the downhole measurement data to the ground. It can automatically adjust the pulser working mode according to the drilling conditions, so that the instrument can be adapted to large-displacement drilling. The adaptive large-displacement mud pulser has an action monitor, which can monitor the working current of the pulser and the rotation angle of the pulser rotor in real time according to the actual mud conditions, and determine the load state of the pulser by the rotation angle of the pulser rotor. For example, when the action monitor detects that the rotation angle of the rotor is less than the preset angle value, the action monitor adjusts the rotation angle of the rotor until the action monitor detects that the working current of the pulser is less than the preset current value; for another example, when the action monitor detects that the rotation angle of the rotor is equal to the preset angle value, and the working current of the pulser is greater than the preset current value, the action monitor adjusts the working current of the pulser until the working current of the pulser is less than the preset current value. Therefore, the adaptive large-displacement mud pulser can automatically adjust the action of the pulser in real time to ensure that the pulser works under appropriate performance indicators (the working current of the pulser is less than 2.5A), so that the mud pulser has the function of adaptive large-displacement mud. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. It should be understood that the specific shapes and structures shown in the drawings should not usually be regarded as limiting conditions for implementing the present application; for example, based on the technical concepts and exemplary drawings disclosed in the present application, those skilled in the art are able to easily make routine adjustments or further optimizations to the increase / decrease / attribution division, specific shapes, positional relationships, connection methods, and dimensional ratios of certain units (components).

[0029] Figure 1 It is a schematic cross-sectional structure diagram of an adaptive large-displacement mud pulser provided by the present application in one embodiment;

[0030] Figure 2 It is a principle block diagram of an action monitor of an adaptive large-displacement mud pulser provided by the present application in one embodiment;

[0031] Figure 3 The following is a flow chart of the adaptive principle of the adaptive large-displacement mud pulser provided by the present application in one embodiment.

[0032] Description of reference numerals:

[0033] 1. Pin; 2. Fishing head; 3. Stator holder; 4. Stator; 5. Rotor; 6. Valve group housing; 7. Pulser body; 8. Motor; 9. Speed ​​reducer; 10. Transmission shaft; 11. Control circuit structure;

[0034] 100, motion monitor; 110, current monitoring module; 111, current sensor; 120, angle monitoring module; 121, angle sensor;

[0035] 130. Processing module; 131. Analog-to-digital conversion unit; 132. Processing unit; 140. Feedback module; 150. Storage module. DETAILED DESCRIPTION

[0036] The present application is further described below in detail through specific embodiments in conjunction with the accompanying drawings.

[0037] In the description of this application: unless otherwise specified, the meaning of "plurality" is two or more. The terms "first", "second", "third", etc. in this application are intended to distinguish the objects referred to, and do not have special meanings in terms of technical connotations (for example, they should not be understood as emphasizing the importance or order, etc.). Expressions such as "including", "comprising", "having", etc. also mean "not limited to" (certain units, components, materials, steps, etc.).

[0038] The terms such as "upper", "lower", "left", "right", "middle", etc. used in this application are usually used to facilitate intuitive understanding by comparing with the accompanying drawings, and are not absolute limitations on the positional relationship in the actual product. Without departing from the technical concept disclosed in this application, changes in these relative positional relationships should also be regarded as the scope of this application.

[0039] Embodiment 1

[0040] In order to solve the problems existing in the prior art, the present application provides an adaptive large-displacement mud pulser. The adaptive large-displacement mud pulser provided by the present application can be used to improve the adaptability of the rotary valve pulser to the large-displacement drilling environment. By increasing the pulser parameter monitoring (realized by the action monitor), the pulser parameters are automatically adjusted to ensure that the pulser works under appropriate performance indicators, thereby adapting to the large-displacement drilling environment. The mud pulser provided by the present application can be used for large-displacement drilling of more than 50L / s, and the pulser action can be automatically controlled according to the actual mud conditions.

[0041] The structure and adaptation principle of the adaptive large-displacement mud pulser provided by the present application are described in detail below in conjunction with the accompanying drawings.

[0042] See also Figure 1 and Figure 2The adaptive large-displacement mud pulser provided in the present application includes a pulser body 7 and a valve group. The pulser body 7 is provided with an action monitor 100, a motor 8, a reducer 9 connected to the motor 8 shaft of the motor 8, and a transmission shaft 10 connected to the output shaft of the reducer 9. The action monitor 100 includes a current monitoring module 110, an angle monitoring module 120, a processing module 130, a feedback module 140 and a storage module 150. The storage module 150 stores a preset current value and a preset angle value (the preset current value is 2.5A; the preset angle value is 45°).

[0043] The valve group mentioned above includes a rotor 5 and a stator 4. The rotor 5 is provided with a plurality of blades, and the stator 4 is provided with a plurality of flow holes, and the blades correspond to the flow holes one by one. The transmission shaft 10 is connected to the rotor 5. When the transmission shaft 10 is driven to rotate, the rotor 5 rotates with the transmission shaft 10, so that the blades thereon realize the opening or closing of the flow holes; the rotor 5 reciprocates with the central axis of the transmission shaft 10 as the rotation center, realizing the opening or closing of the flow holes corresponding thereto. During the rotation of the rotor 5, the blades of the rotor 5 and the flow holes of the stator 4 are in an open or closed position. When in the open position, the mud pressure in the drill bit is low pressure, and when in the closed position, the mud pressure in the drill bit is high pressure, that is, a pulse signal is generated.

[0044] See also Figure 1 The valve group also includes a valve group housing 6, one end of which is provided with a through hole for allowing the transmission shaft 10 to pass through, and the other end forms a mounting seat adapted to the fishing head 2. The rotor 5 and the stator 4 are installed in the valve group housing 6. The valve group housing 6 is provided with a stator holder 3, one end of which is connected to the stator 4, and the other end is connected to the fishing head 2; the stator holder 3 is fixedly connected to the valve group housing 6 by bolts. The stator 4 is fixedly connected to the valve group housing 6 by the stator holder 3 and the pin 1.

[0045] In one embodiment, a control circuit structure 11 for driving the motor 8 to rotate is disposed on the pulse generator body 7 .

[0046] In one embodiment, the current monitoring module 110 realizes real-time monitoring of the working current of the pulser, and the angle monitoring module 120 realizes real-time monitoring of the rotation angle of the rotor 5. The processing module 130 compares the angle value received from the angle monitoring module 120 with the preset angle value, and outputs a signal to the feedback module 140 according to the comparison result. The feedback module 140 adjusts the working current of the pulser or the rotation angle of the rotor 5 according to the signal, so that the working current of the pulser is less than the preset current value.

[0047] In one embodiment, the current monitoring module 110 of the action monitor 100 includes a current sensor 111, and the current monitoring module 110 monitors the working current of the pulser in real time through the current sensor 111 to obtain a current signal representing the working current of the pulser. The angle monitoring module 120 includes an angle sensor 121, and the angle monitoring module 120 monitors the rotation angle of the rotor 5 in real time through the angle sensor 121 to obtain an angle signal representing the rotation angle of the rotor 5. The processing module 130 includes an analog-to-digital conversion unit 131, and the processing module 130 converts the current signal and the angle signal into a current value and an angle value through the analog-to-digital conversion unit 131. The processing module 130 also includes a processing unit 132, and the processing unit 132 obtains a preset current value and a preset angle value from the storage module 150, and compares the current value and the angle value with the preset current value and the preset angle value respectively.

[0048] When the angle value is less than the preset angle value, the processing unit 132 determines that the pulser load is too large, and the processing unit 132 outputs a control signal to the feedback module 140. The feedback module 140 adjusts the action of the motor 8 through the control circuit structure 11, so that the rotor 5 is driven to rotate, so as to reduce the rotation angle of the rotor 5 and reduce the shielding area of ​​the blade on the flow hole; when the current monitoring module 110 detects that the working current value of the pulser is less than the preset current value, the feedback module 140 completes the adjustment of the rotation angle of the rotor 5.

[0049] When the angle value is equal to the preset angle value and the current value is greater than the preset current value, the processing unit 132 determines that the pulser load is too large, and the processing unit 132 outputs a control signal to the feedback module 140, and the feedback module 140 limits the current of the pulser according to the control signal; when the current monitoring module 110 detects that the working current value of the pulser is less than the preset current value, the feedback module 140 completes the adjustment of the working current of the pulser.

[0050] The adaptive large-displacement mud pulser provided by the present application is used in the measurement while drilling process, and can upload the downhole measurement data to the ground. It can automatically adjust the pulser working mode according to the drilling conditions, so that the instrument can be adapted to large-displacement drilling. The adaptive large-displacement mud pulser has an action monitor 100, which can monitor the working current of the pulser and the rotation angle of the pulser rotor 5 in real time according to the actual mud conditions, and determine the load state of the pulser by the rotation angle of the pulser rotor 5. For example, when the action monitor 100 detects that the rotation angle of the rotor 5 is less than the preset angle value, the action monitor 100 adjusts the rotation angle of the rotor 5 until the action monitor 100 detects that the working current of the pulser is less than the preset current value; for another example, when the action monitor 100 detects that the rotation angle of the rotor 5 is equal to the preset angle value, and the working current of the pulser is greater than the preset current value, the action monitor 100 adjusts the working current of the pulser until the working current of the pulser is less than the preset current value. Therefore, the adaptive large-displacement mud pulser can automatically adjust the action of the pulser in real time to ensure that the pulser works under appropriate performance indicators (the working current of the pulser is less than 2.5A), so that the mud pulser has the function of adaptive large-displacement mud.

[0051] Embodiment 2

[0052] The embodiment of the present application provides an adaptive method of a mud pulser for large displacement mud. The mud pulser is the adaptive large displacement mud pulser provided in the above embodiment. The adaptive method may include the following steps:

[0053] See also Figure 3 When monitoring the action of the pulser, the rotation angle of the rotor 5 of the pulser valve group is monitored in real time through the action monitor 100 on the pulser body 7; the working current of the pulser is monitored in real time through the action monitor 100.

[0054] When the action monitor 100 detects that the rotation angle of the rotor 5 is less than 45° (the action monitor 100 determines that the pulser workload is too high), the action monitor 100 adjusts the rotation angle of the rotor 5 (reduces the rotor rotation angle, reduces the area of ​​the flow hole blocked by the blades, and will not be completely closed) until the action monitor 100 detects that the operating current of the pulser is less than 2.5A, at which time the pulser operates normally.

[0055] When the action monitor 100 detects that the rotation angle of the rotor 5 is equal to 45°, and the working current of the pulser is greater than 2.5A (the action monitor 100 determines that the pulser workload is too high), the action monitor 100 adjusts the working current of the pulser (pulser current limiting, i.e. limiting the working current of the pulser) until the working current of the pulser is less than 2.5A, at which time the pulser works normally. That is, when the rotation angle of the rotor 5 of the pulser is 45°, it is determined that the pulser workload is in a normal state. At this time, the power consumption is reduced by limiting the whole machine current, and the single well usage time of the instrument is extended.

[0056] Therefore, the adaptive method of the mud pulser for large displacement mud provided in the present application is to adjust the pulser parameters through the action monitor, so as to achieve action optimization.

[0057] The technical features of the above embodiments may be arbitrarily combined (as long as there is no contradiction in the combination of these technical features). To make the description concise, not all possible combinations of the technical features in the above embodiments are described; these embodiments that are not explicitly written should also be considered to be within the scope of this specification.

[0058] The above is a relatively specific and detailed description of the present application through general description and specific embodiments. It should be understood that, based on the technical concept of the present application, several conventional adjustments or further innovations can be made to these specific embodiments; however, as long as they do not deviate from the technical concept of the present application, the technical solutions obtained by these conventional adjustments or further innovations also fall within the scope of protection of the claims of the present application.

Claims

1. An adaptive large-displacement mud pulser, characterized in that: The pulse generator comprises a body, on which an action monitor, a motor, a reducer connected to the motor shaft of the motor, and a transmission shaft connected to the output shaft of the reducer are arranged, the action monitor comprises a current monitoring module, an angle monitoring module, a processing module, a feedback module and a storage module, and the storage module stores a preset current value and a preset angle value; It also includes a valve group, the valve group includes a rotor and a stator, the rotor is provided with blades, the stator is provided with a flow hole, the transmission shaft is connected to the rotor, when the transmission shaft is driven to rotate, the rotor rotates with the transmission shaft, so that the blades on it can realize the opening or closing of the flow hole; The current monitoring module realizes real-time monitoring of the working current of the pulser, and the angle monitoring module realizes real-time monitoring of the rotation angle of the rotor. The processing module compares the angle value received from the angle monitoring module with the preset angle value, and outputs a signal to the feedback module according to the comparison result. The feedback module adjusts the working current of the pulser or the rotation angle of the rotor according to the signal, so that the working current of the pulser is less than the preset current value; The main body is also provided with a control circuit structure that drives the motor to rotate; The current monitoring module of the action monitor includes a current sensor, and the current monitoring module monitors the working current of the pulser in real time through the current sensor to obtain a current signal representing the working current of the pulser; The angle monitoring module includes an angle sensor, and the angle monitoring module monitors the rotation angle of the rotor in real time through the angle sensor to obtain an angle signal representing the rotation angle of the rotor; The processing module includes an analog-to-digital conversion unit, and the processing module converts the current signal and the angle signal into a current value and an angle value through the analog-to-digital conversion unit; The processing module further includes a processing unit, wherein the processing unit obtains a preset current value and a preset angle value from the storage module, and compares the current value and the angle value with the preset current value and the preset angle value respectively; When the angle value is less than the preset angle value, the processing unit determines that the pulser load is too large, and the processing unit outputs a control signal to the feedback module. The feedback module adjusts the motor action through the control circuit structure so that the rotor is driven to rotate to reduce the rotation angle of the rotor and reduce the shielding area of ​​the blade on the flow hole; when the current monitoring module detects that the working current value of the pulser is less than the preset current value, the feedback module completes the adjustment of the rotation angle of the rotor.

2. The adaptive large-displacement mud pulser according to claim 1, characterized in that: The valve group further comprises a valve group housing, one end of which is provided with a through hole for allowing the transmission shaft to pass through, and the other end of which is formed with a mounting seat adapted to the fishing head, the rotor and the stator are mounted in the valve group housing, and a stator holder is arranged on the valve group housing, one end of the stator holder is connected to the stator, and the other end is connected to the fishing head; The stator fixture is fixedly connected to the valve group housing by bolts.

3. The adaptive large-displacement mud pulser according to claim 2, characterized in that: The rotor is provided with a plurality of blades, the stator is provided with a plurality of flow holes, and the blades correspond to the flow holes one by one; The stator is fixedly connected to the valve group housing through a stator fixer and pins.

4. The adaptive large-displacement mud pulser according to claim 1, characterized in that: When the angle value is equal to the preset angle value and the current value is greater than the preset current value, the processing unit determines that the pulser load is too large, and the processing unit outputs a control signal to the feedback module, and the feedback module limits the working current of the pulser according to the control signal; When the current monitoring module detects that the operating current value of the pulser is less than the preset current value, the feedback module completes the adjustment of the operating current of the pulser.

5. The adaptive large-displacement mud pulser according to claim 1, characterized in that: The preset current value is 2.5A; the preset angle value is 45°; The rotor reciprocates with the central axis of the transmission shaft as the rotation center to open or close the corresponding flow holes.

6. A method for adaptively controlling a mud pulser for large displacement mud, characterized in that: The mud pulser is an adaptive large-displacement mud pulser according to any one of claims 1 to 5, and the adaptive method comprises: The rotation angle of the rotor of the pulser valve group is monitored in real time through the action monitor on the pulser body; The working current of the pulser is monitored in real time through the action monitor; When the motion monitor detects that the rotation angle of the rotor is less than the preset angle value, the motion monitor adjusts the rotation angle of the rotor until the motion monitor detects that the working current of the pulser is less than the preset current value; When the action monitor detects that the rotation angle of the rotor is equal to the preset angle value and the operating current of the pulser is greater than the preset current value, the action monitor adjusts the operating current of the pulser until the operating current of the pulser is less than the preset current value.

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