A filtering method for filtering mud pump pressure ripple

Abstract

The application discloses a filtering method for filtering mud pump pressure ripple, and belongs to the technical field of oil and gas drilling, and comprises the following steps: a, a bypass pipeline is additionally arranged beside a drilling fluid riser, and a buffer is arranged on the bypass pipeline; b, a pressure sensor is arranged at the outlet of a mud pump to collect pressure signals, and a control signal opposite to the crest and trough of a mud pump pulse pressure wave is generated after computer processing, and the control signal is used for controlling the buffer to balance the pulse pressure wave; c, a valve mechanism is connected to the bypass pipeline, and a controller is connected to the valve mechanism; d, when a downlink instruction is transmitted, the valve mechanism is controlled to be turned on by a rotary guide downlink instruction transmission control system, and the buffer is used for balancing the excited pressure wave when the valve mechanism is in action. The bypass pipeline is turned on when the downlink instruction needs to be transmitted, and the excited pressure wave can be balanced by the buffer, so that the downlink instruction transmission precision is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of oil and gas drilling technology, and in particular to a filtering method for filtering pressure clutter in mud pumps. Background Technology

[0002] Rotary steering technology is a technique that uses downhole rotary steering instruments to perform directional drilling based on steering commands transmitted from the surface. Currently, in field engineering applications, the main method involves using a downhole transmission device to divert drilling fluid, thereby adjusting the drilling mud pump discharge rate to change the flow rate of the drilling fluid through the instrument, thus transmitting the rotary steering commands to the downhole instrument.

[0003] Drilling mud pumps are mostly three-cylinder pumps. When the three-cylinder pump is running, it will generate pulse pressure waves. When the downlink device sends commands, the action of the diversion valve will generate excitation pressure waves. Both of these pulse pressure waves are noise pressure waves, which will interfere with the pressure signals received by downhole instruments and require filtering.

[0004] Chinese patent document CN106089188A, published on November 9, 2016, discloses a method for real-time noise removal from a mud pulse signal pump, comprising the following steps, characterized in that: Step 1: Use a speed sensor to measure the crankshaft speed of the mud pump in real time; use a pressure sensor to detect the drilling fluid pressure signal in real time and convert it into a digital pressure signal. Step 2: Calculate the instantaneous fundamental frequency of the pump noise using the measured crankshaft speed of the mud pump; Step 3: Calculate the amplitude and phase of the pump noise harmonics using the instantaneous fundamental frequency and the drilling fluid digital pressure signal; Step 4: The pump noise of the mud pulse signal is reconstructed using the pump noise harmonic frequency, amplitude and phase. The reconstructed pump noise is then directly subtracted from the drilling fluid digital pressure signal to achieve real-time removal of pump noise.

[0005] The patent document discloses a real-time method for removing pump noise from mud pulse signals. This method uses real-time rotational speed calculation and analyzes the spectral characteristics of the pump noise to remove it, thus improving the robustness of noise removal. Furthermore, the data acquisition and processing time interval of the rotational speed sensor or position sensor is much shorter than the time interval between two adjacent pump strokes, which is more conducive to real-time data analysis and processing. However, since the real-time removal of pump noise is achieved by detecting the real-time rotational speed of the mud pump spindle, reconstructing the pump noise, and then directly subtracting the reconstructed pump noise from the original signal, no noise reduction processing is performed on the mud pressure wave pumped into the drill string. This still results in continuous pulse wave interference with downhole instrument command reception, affecting the accuracy of command transmission. Summary of the Invention

[0006] To overcome the shortcomings of the prior art, this invention provides a filtering method for filtering pressure noise in mud pumps. This invention involves installing a bypass pipeline on the drilling fluid riser and installing a buffer in the bypass pipeline. The buffer is controlled by a rotary guide command transmission control system. When a command needs to be transmitted, the bypass pipeline is opened. The buffer can balance the excitation pressure wave, thereby effectively improving the accuracy of command transmission.

[0007] This invention is achieved through the following technical solution: A filtering method for filtering pressure noise in mud pumps, characterized by comprising the following steps: a. Install a bypass pipeline next to the drilling fluid riser and install a buffer on the bypass pipeline; b. Install a pressure sensor at the outlet of the mud pump to collect pressure signals. After processing by a computer, generate a control signal that is opposite to the peak and trough of the pulse pressure wave of the mud pump. The control signal is used to control the buffer to balance the pulse pressure wave. c. Connect the valve mechanism to the bypass pipeline, and connect the controller to the valve mechanism; d. When transmitting commands, the control system transmits the commands via rotation guide to control the valve mechanism to open the bypass pipeline. When the valve mechanism moves, the shock absorber balances the excitation pressure wave.

[0008] In step a, the buffer includes a hydraulic device and a storage tank containing drilling fluid. The control chip of the hydraulic device controls the storage tank to release or recover drilling fluid to balance the noise pressure wave.

[0009] In step b, the control signal is stored in the control chip.

[0010] In step b, the balanced pulse pressure wave refers to the automatic control of the hydraulic device to recover or release drilling fluid in the storage tank under the action of a control signal during drilling operations.

[0011] The drilling fluid recovery refers to the recovery of drilling fluid at the peak of the pulse pressure wave.

[0012] The drilling fluid release refers to releasing drilling fluid at the trough of the pulse pressure wave.

[0013] In step d, controlling the valve mechanism to open the bypass pipeline means closing the drilling fluid riser and opening the valve mechanism to allow the drilling fluid to flow through the bypass pipeline.

[0014] In step d, balancing the excitation pressure wave means that during the process of transmitting the command, when the valve mechanism opens or closes, the buffer's storage tank releases or recovers drilling fluid to balance the excitation pressure wave.

[0015] In step d, the rotation guide command transmission control system is electrically connected to the control chip of the hydraulic device.

[0016] The control chip is used to receive rotational guidance commands and transmit them to the control system.

[0017] The valve mechanism, controller, hydraulic device, and rotary guide command transmission control system described in this invention are all existing technologies.

[0018] The beneficial effects of this invention are mainly reflected in the following aspects: I. Compared with the prior art, the present invention adds a bypass pipeline to the drilling fluid riser and installs a buffer in the bypass pipeline. The buffer is controlled by a rotation guide command transmission control system. When a command needs to be transmitted, the bypass pipeline is opened. The buffer can balance the excitation pressure wave, thereby effectively improving the command transmission accuracy.

[0019] II. This invention can filter the pulse pressure waves generated during the operation of the mud pump, thereby improving the accuracy of the rotary guide command transmission.

[0020] Third, this invention allows the use of the original drilling fluid riser during normal drilling, without affecting normal drilling and thus improving drilling efficiency.

[0021] IV. This invention, through a valve mechanism, changes the valve flow area, thereby eliminating pressure pulse waves in the mud pump and making the mud pressure signal more stable.

[0022] V. In this invention, the controller receives the valve opening and closing signal sent by the rotary steering command transmission control system, which is opposite to the pulse pressure wave generated by the mud pump. This cancels out the pulse pressure wave of the mud pump, making the mud pressure more stable and the rotary steering command transmitted to the wellbore clearer. VI. Compared to the Chinese patent document CN106089188A, published on November 9, 2016, which detects the real-time rotational speed of the mud pump spindle, reconstructs the pump noise, and then directly subtracts the reconstructed pump noise from the original signal to achieve real-time removal of pump noise, this invention uses a bypass pipeline installed on the drilling fluid riser and a buffer installed on the bypass pipeline. The buffer valve mechanism receives periodic opening and closing signals opposite to the mud pump pulse wave, canceling the peak and trough signals of the mud pump pressure pulse wave, thereby significantly reducing noise and making the transmitted command signal clearer. Attached Figure Description

[0023] The present invention will now be further described in detail with reference to the accompanying drawings and specific embodiments, wherein: Figure 1 This is a flowchart of the present invention; Figure 2 This is a schematic diagram showing the connection between the buffer and the rotation guide command transmission control system of the present invention; The markings in the diagram are: 1. Drilling fluid riser, 2. Bypass line, 3. Buffer, 4. Valve mechanism, 5. Controller, 6. Rotary guide command transmission control system, 7. Hydraulic device, 8. Storage tank, 9. Control chip. Detailed Implementation

[0024] Example 1 See Figure 1 and Figure 2 A filtering method for filtering pressure clutter in mud pumps includes the following steps: a. Install a bypass pipe 2 next to the drilling fluid riser 1, and install a buffer 3 on the bypass pipe 2; b. Install a pressure sensor at the outlet of the mud pump to collect pressure signals. After processing by a computer, generate a control signal that is opposite to the peak and trough of the mud pump pulse pressure wave. The control signal is used to control the buffer 3 to balance the pulse pressure wave. c. Connect valve mechanism 4 to bypass pipeline 2, and connect controller 5 to valve mechanism 4; d. When transmitting commands, the control system 6 transmits commands via rotation guide to control valve mechanism 4 to open bypass pipeline 2. When valve mechanism 4 operates, the shock absorber balances the excitation pressure wave.

[0025] This embodiment is the most basic implementation method. Compared with the prior art, by adding a bypass pipe 2 to the drilling fluid riser 1 and installing a buffer 3 on the bypass pipe 2, the buffer 3 is controlled by the rotation guide command transmission control system 6. When a command needs to be transmitted, the bypass pipe 2 is opened. The buffer 3 can balance the excitation pressure wave, thereby effectively improving the command transmission accuracy.

[0026] Example 2 See Figure 1 and Figure 2 A filtering method for filtering pressure clutter in mud pumps includes the following steps: a. Install a bypass pipe 2 next to the drilling fluid riser 1, and install a buffer 3 on the bypass pipe 2; b. Install a pressure sensor at the outlet of the mud pump to collect pressure signals. After processing by a computer, generate a control signal that is opposite to the peak and trough of the mud pump pulse pressure wave. The control signal is used to control the buffer 3 to balance the pulse pressure wave. c. Connect valve mechanism 4 to bypass pipeline 2, and connect controller 5 to valve mechanism 4; d. When transmitting commands, the control system 6 transmits commands via rotation guide to control valve mechanism 4 to open bypass pipeline 2. When valve mechanism 4 operates, the shock absorber balances the excitation pressure wave.

[0027] In step a, the buffer 3 includes a hydraulic device 7 and a storage tank 8 containing drilling fluid. The control chip 9 of the hydraulic device 7 controls the storage tank 8 to release or recover drilling fluid to balance the noise pressure wave.

[0028] This embodiment is a preferred implementation method, which can filter the pulse pressure waves generated during the operation of the mud pump and improve the accuracy of the rotary guide command transmission.

[0029] Example 3 See Figure 1 and Figure 2 A filtering method for filtering pressure clutter in mud pumps includes the following steps: a. Install a bypass pipe 2 next to the drilling fluid riser 1, and install a buffer 3 on the bypass pipe 2; b. Install a pressure sensor at the outlet of the mud pump to collect pressure signals. After processing by a computer, generate a control signal that is opposite to the peak and trough of the mud pump pulse pressure wave. The control signal is used to control the buffer 3 to balance the pulse pressure wave. c. Connect valve mechanism 4 to bypass pipeline 2, and connect controller 5 to valve mechanism 4; d. When transmitting commands, the control system 6 transmits commands via rotation guide to control valve mechanism 4 to open bypass pipeline 2. When valve mechanism 4 operates, the shock absorber balances the excitation pressure wave.

[0030] In step a, the buffer 3 includes a hydraulic device 7 and a storage tank 8 containing drilling fluid. The control chip 9 of the hydraulic device 7 controls the storage tank 8 to release or recover drilling fluid to balance the noise pressure wave.

[0031] In step b, the control signal is stored in the control chip 9.

[0032] In step b, the balanced pulse pressure wave refers to the automatic control of the hydraulic device 7 to recover or release drilling fluid in the storage tank 8 under the action of the control signal during drilling operations.

[0033] This embodiment is another preferred implementation method. During normal drilling, the original drilling fluid riser 1 is used, which does not affect normal drilling and helps to improve drilling efficiency.

[0034] Example 4 See Figure 1 and Figure 2 A filtering method for filtering pressure clutter in mud pumps includes the following steps: a. Install a bypass pipe 2 next to the drilling fluid riser 1, and install a buffer 3 on the bypass pipe 2; b. Install a pressure sensor at the outlet of the mud pump to collect pressure signals. After processing by a computer, generate a control signal that is opposite to the peak and trough of the mud pump pulse pressure wave. The control signal is used to control the buffer 3 to balance the pulse pressure wave. c. Connect valve mechanism 4 to bypass pipeline 2, and connect controller 5 to valve mechanism 4; d. When transmitting commands, the control system 6 transmits commands via rotation guide to control valve mechanism 4 to open bypass pipeline 2. When valve mechanism 4 operates, the shock absorber balances the excitation pressure wave.

[0035] In step a, the buffer 3 includes a hydraulic device 7 and a storage tank 8 containing drilling fluid. The control chip 9 of the hydraulic device 7 controls the storage tank 8 to release or recover drilling fluid to balance the noise pressure wave.

[0036] In step b, the control signal is stored in the control chip 9.

[0037] In step b, the balanced pulse pressure wave refers to the automatic control of the hydraulic device 7 to recover or release drilling fluid in the storage tank 8 under the action of the control signal during drilling operations.

[0038] The drilling fluid recovery refers to the recovery of drilling fluid at the peak of the pulse pressure wave.

[0039] The drilling fluid release refers to releasing drilling fluid at the trough of the pulse pressure wave.

[0040] This embodiment is another preferred implementation method. By changing the valve flow area through the valve mechanism 4, the pressure pulse wave of the mud pump can be eliminated, making the mud pressure signal more stable.

[0041] Example 5 See Figure 1 and Figure 2 A filtering method for filtering pressure clutter in mud pumps includes the following steps: a. Install a bypass pipe 2 next to the drilling fluid riser 1, and install a buffer 3 on the bypass pipe 2; b. Install a pressure sensor at the outlet of the mud pump to collect pressure signals. After processing by a computer, generate a control signal that is opposite to the peak and trough of the mud pump pulse pressure wave. The control signal is used to control the buffer 3 to balance the pulse pressure wave. c. Connect valve mechanism 4 to bypass pipeline 2, and connect controller 5 to valve mechanism 4; d. When transmitting commands, the control system 6 transmits commands via rotation guide to control valve mechanism 4 to open bypass pipeline 2. When valve mechanism 4 operates, the shock absorber balances the excitation pressure wave.

[0042] In step a, the buffer 3 includes a hydraulic device 7 and a storage tank 8 containing drilling fluid. The control chip 9 of the hydraulic device 7 controls the storage tank 8 to release or recover drilling fluid to balance the noise pressure wave.

[0043] In step b, the control signal is stored in the control chip 9.

[0044] In step b, the balanced pulse pressure wave refers to the automatic control of the hydraulic device 7 to recover or release drilling fluid in the storage tank 8 under the action of the control signal during drilling operations.

[0045] The drilling fluid recovery refers to the recovery of drilling fluid at the peak of the pulse pressure wave.

[0046] The drilling fluid release refers to releasing drilling fluid at the trough of the pulse pressure wave.

[0047] In step d, controlling the valve mechanism 4 to open the bypass pipeline 2 means closing the drilling fluid riser 1 and opening the valve mechanism 4 to allow the drilling fluid to flow through the bypass pipeline 2.

[0048] In step d, balancing the excitation pressure wave means that during the process of transmitting the command, when the valve mechanism 4 opens or closes, the reservoir 8 of the buffer 3 releases or recovers drilling fluid to balance the excitation pressure wave.

[0049] This embodiment is another preferred implementation. The controller 5 receives the opening and closing valve signal sent by the rotary steering command transmission control system 6, which is opposite to the pulse pressure wave generated by the mud pump. This cancels the pulse pressure wave of the mud pump, making the mud pressure more stable and the rotary steering command transmitted to the wellbore clearer. Example 6 See Figure 1 and Figure 2 A filtering method for filtering pressure clutter in mud pumps includes the following steps: a. Install a bypass pipe 2 next to the drilling fluid riser 1, and install a buffer 3 on the bypass pipe 2; b. Install a pressure sensor at the outlet of the mud pump to collect pressure signals. After processing by a computer, generate a control signal that is opposite to the peak and trough of the mud pump pulse pressure wave. The control signal is used to control the buffer 3 to balance the pulse pressure wave. c. Connect valve mechanism 4 to bypass pipeline 2, and connect controller 5 to valve mechanism 4; d. When transmitting commands, the control system 6 transmits commands via rotation guide to control valve mechanism 4 to open bypass pipeline 2. When valve mechanism 4 operates, the shock absorber balances the excitation pressure wave.

[0050] In step a, the buffer 3 includes a hydraulic device 7 and a storage tank 8 containing drilling fluid. The control chip 9 of the hydraulic device 7 controls the storage tank 8 to release or recover drilling fluid to balance the noise pressure wave.

[0051] In step b, the control signal is stored in the control chip 9.

[0052] In step b, the balanced pulse pressure wave refers to the automatic control of the hydraulic device 7 to recover or release drilling fluid in the storage tank 8 under the action of the control signal during drilling operations.

[0053] The drilling fluid recovery refers to the recovery of drilling fluid at the peak of the pulse pressure wave.

[0054] The drilling fluid release refers to releasing drilling fluid at the trough of the pulse pressure wave.

[0055] In step d, controlling the valve mechanism 4 to open the bypass pipeline 2 means closing the drilling fluid riser 1 and opening the valve mechanism 4 to allow the drilling fluid to flow through the bypass pipeline 2.

[0056] In step d, balancing the excitation pressure wave means that during the process of transmitting the command, when the valve mechanism 4 opens or closes, the reservoir 8 of the buffer 3 releases or recovers drilling fluid to balance the excitation pressure wave.

[0057] In step d, the rotation guide command transmission control system 6 is electrically connected to the control chip 9 of the hydraulic device 7.

[0058] The control chip 9 is used to receive rotational guidance commands and transmit them to the control system 6.

[0059] This embodiment is the best implementation method. Compared with the Chinese patent document with publication number CN106089188A and publication date of November 9, 2016, which detects the real-time rotational speed of the mud pump spindle, reconstructs the pump noise, and then directly subtracts the reconstructed pump noise from the original signal to achieve real-time removal of pump noise, this invention adds a bypass pipe 2 to the drilling fluid riser 1 and installs a buffer 3 on the bypass pipe 2. The valve mechanism 4 of the buffer 3 receives a periodic opening and closing signal opposite to the mud pump pulse wave, canceling the peak and trough signals of the mud pump pressure pulse wave, thereby achieving a significant reduction in noise and making the transmitted command signal clearer.

[0060] The process by which the buffer balances the excitation pressure wave is as follows: When the buffer 3 is connected to the rotary guide command transmission control system 6 and a command is transmitted, the rotary guide command transmission control system 6 sends a command to the control chip 9 while opening or closing the valve mechanism 4, actively controlling the buffer 3 to release or recover drilling fluid, thereby balancing the excitation pressure wave. When the buffer 3 operates independently and is not connected to the rotary guide command transmission control system 6, when transmitting commands, the rotary guide command transmission control system 6 controls the valve mechanism 4 to open or close. Since the buffer 3 is closer to the valve mechanism 4, when the excitation pressure wave is transmitted to the buffer 3, the buffer 3 passively releases or recovers the drilling fluid, preventing the excitation pressure wave from being transmitted to the drilling fluid riser 1, thereby balancing the excitation pressure wave.

Claims

1. A filtering method for filtering pressure noise in mud pumps, characterized in that, Includes the following steps: a. Install a bypass pipeline (2) next to the drilling fluid riser (1) and install a buffer (3) on the bypass pipeline (2); b. Install a pressure sensor at the outlet of the mud pump to collect pressure signals. After processing by a computer, generate a control signal that is opposite to the peak and trough of the mud pump pulse pressure wave. The control signal is used to control the buffer (3) to balance the pulse pressure wave. c. Connect valve mechanism (4) to bypass pipeline (2), and connect controller (5) to valve mechanism (4); d. When transmitting instructions, the control system (6) transmits the instructions via rotation guide to control the valve mechanism (4) to open the bypass pipeline (2). When the valve mechanism (4) operates, the shock absorber (3) balances the excitation pressure wave.

2. The filtering method for filtering pressure noise in mud pumps according to claim 1, characterized in that: In step a, the buffer (3) includes a hydraulic device (7) and a storage tank (8) containing drilling fluid. The control chip (9) of the hydraulic device (7) controls the storage tank (8) to release or recover drilling fluid to balance the noise pressure wave.

3. The filtering method for filtering pressure noise in mud pumps according to claim 2, characterized in that: In step b, the control signal is stored in the control chip (9).

4. The filtering method for filtering pressure noise in mud pumps according to claim 2, characterized in that: In step b, the balanced pulse pressure wave refers to the automatic control of the hydraulic device (7) to recover or release drilling fluid in the storage tank (8) under the action of the control signal during drilling operations.

5. A filtering method for filtering pressure noise in mud pumps according to claim 4, characterized in that: The drilling fluid recovery refers to the recovery of drilling fluid at the peak of the pulse pressure wave.

6. A filtering method for filtering pressure clutter in mud pumps according to claim 4, characterized in that: The drilling fluid release refers to releasing drilling fluid at the trough of the pulse pressure wave.

7. A filtering method for filtering pressure noise in mud pumps according to claim 1, characterized in that: In step d, controlling the valve mechanism (4) to open the bypass pipeline (2) means closing the drilling fluid riser (1) and opening the valve mechanism (4) so ​​that the drilling fluid flows through the bypass pipeline (2).

8. A filtering method for filtering pressure clutter in mud pumps according to claim 2, characterized in that: In step d, balancing the excitation pressure wave means that during the process of transmitting the command, when the valve mechanism (4) performs the action of opening or closing, the reservoir (8) of the buffer (3) releases or recovers drilling fluid to balance the excitation pressure wave.

9. A filtering method for filtering pressure clutter in mud pumps according to claim 2, characterized in that: In step d, the rotation guide command transmission control system (6) is electrically connected to the control chip (9) of the hydraulic device (7).

10. A filtering method for filtering pressure noise in a mud pump according to claim 9, characterized in that: The control chip (9) is used to receive the rotation guidance command and transmit it to the control system (6).

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