Mud pressure wave signal modulation apparatus and method

Patent metadata

Field	Value
Publication number	US-12448885-B2
Application number	US-202218566144-A
Country	US
Kind code	B2
Filing date	Dec 6, 2022
Priority date	Dec 30, 2021
Publication date	Oct 21, 2025
Grant date	Oct 21, 2025

Abstract

The present disclosure discloses a mud pressure wave signal modulation apparatus and method, which relate to the technical field of petroleum drilling engineering. The apparatus includes: a motor ( 5 ), a valve plate ( 3 ), a main control circuit ( 23 ), a motor drive control circuit, and a downhole communication circuit; the valve plate ( 3 ) is driven by the motor ( 5 ) to be rotated around an axial direction perpendicular to a flow direction of drilling fluid; the motor ( 5 ) and the valve plate ( 3 ) are disposed in a drilling fluid channel ( 2 ), and the drilling fluid channel ( 2 ), the motor ( 5 ), the valve plate ( 3 ), the main control circuit ( 23 ), the motor drive control circuit and the downhole communication circuit are disposed in a drill collar.

First claim

The invention claimed is:

1. A mud pressure wave signal modulation apparatus, comprising a motor, a valve plate, a main control circuit, a motor drive control circuit, and a downhole communication circuit;
wherein the valve plate is driven by the motor to be rotated around an axial direction perpendicular to a flow direction of drilling fluid, and a cross-section for controlling a size of an actual flow channel of the drilling fluid in a drilling fluid channel is formed through the rotation of the valve plate; the motor and the valve plate are disposed in the drilling fluid channel, and the drilling fluid channel, the main control circuit, the motor drive control circuit and the downhole communication circuit are disposed in a drill collar; and
the main control circuit is configured to receive downhole Measurement While Drilling data sent by the downhole communication circuit, generate a control sequence based on motor data provided by the motor drive control circuit, angle information of the valve plate provided by the downhole communication circuit and a preset working mode, when determining that the downhole Measurement While Drilling data needs to be transmitted to ground according to a preset program, and send the control sequence to the motor drive control circuit so that the motor drive control circuit controls the motor to work in the preset working mode.

2. The mud pressure wave signal modulation apparatus according to claim 1 , wherein the valve plate comprises an arc-shaped valve plate; a cross-section formed by the arc-shaped valve plate blocks a flow of the drilling fluid in the drilling fluid channel when being rotated to a direction perpendicular to the drilling fluid, and the actual flow channel of the drilling fluid in the drilling fluid channel is the largest when the cross-section formed by the arc-shaped valve plate is rotated to a direction parallel to the drilling fluid.

3. The mud pressure wave signal modulation apparatus according to claim 1 , further comprising a motor torque output shaft perpendicular to the flow direction of the drilling fluid, and the valve plate is connected to the motor through the motor torque output shaft and is driven by the motor to be rotated around the motor torque output shaft.

4. The mud pressure wave signal modulation apparatus according to claim 3 , wherein the motor torque output shaft is further provided with a torsion spring which comprises a first end connected to the motor torque output shaft and a second end connected to the valve plate;
the preset work mode comprises any one of mode1, mode2 and mode3:
the mode 1: the motor rotates continuously, the valve plate rotates with the motor in a circular motion, and a circle of rotation is a motor working cycle;
the mode 2: the motor works intermittently; after the motor drives the valve plate to deflect by a first preset angle from a first initial position to a first preset direction, the motor stops working, and the valve plate moves in a direction opposite to the first preset direction under an action of the torsion spring; after the valve plate moves to the first initial position, the motor continues working and drives the valve plate to deflect by the first preset angle in the direction opposite to the first preset direction, then the motor stops working, and the valve plate moves to the first preset direction under the action of the torsion spring until returning to the first initial position, which is a motor working cycle;
the mode 3: the motor works intermittently; after the motor drives the valve plate to deflect by a second preset angle from a second initial position to a second preset direction, the motor stops working, and the valve plate swings back and forth in the second preset direction and a direction opposite thereto under the action of the torsion spring until finally stopping at the second initial position, which is a motor working cycle.

5. The mud pressure wave signal modulation apparatus according to claim 1 , further comprising a data processing and storage circuit;
the main control circuit is further configured to, when receiving the downhole Measurement While Drilling data sent by the downhole communication circuit, and determining that the downhole Measurement While Drilling data does not need to be transmitted to the ground according to the preset program, store the downhole Measurement While Drilling data in the data processing and storage circuit, and fetch the downhole Measurement While Drilling data therefrom when the downhole Measurement While Drilling data needs to be sent to the ground.

6. The mud pressure wave signal modulation apparatus according to claim 1 , wherein the main control circuit is further configured to receive downhole real-time monitoring data sent by the downhole communication circuit; and when receiving a ground instruction indicating to send the downhole real-time monitoring data to the ground, generate the control sequence based on the motor data provided by the motor drive control circuit, the angle information of the valve plate provided by the downhole communication circuit and the preset working mode, and send the control sequence to the motor drive control circuit so that the motor drive control circuit controls the motor to work in the preset working mode.

7. The mud pressure wave signal modulation apparatus according to claim 1 , further comprising a power conversion circuit which comprises a first end connected to the main control circuit, and a second end connected to the motor drive control circuit;
the main control circuit is further configured to, when receiving the downhole Measurement While Drilling data sent by the downhole communication circuit and determining that the downhole Measurement While Drilling data needs to be transmitted to the ground according to the preset program, if the motor drive control circuit is not started, control the power conversion circuit to supply power for the motor drive control circuit; and if the downhole Measurement While Drilling data no longer needs to be transmitted to the ground, control the power conversion circuit to stop supplying power to the motor drive control circuit.

8. The mud pressure wave signal modulation apparatus according to claim 1 , wherein the motor data comprises at least one selected from a group of position information, coil temperature, rotor speed and motor fault code.

9. The mud pressure wave signal modulation apparatus according to claim 1 , wherein the main control circuit is further configured to, when receiving a ground instruction indicating to switch the working mode, generate the control sequence based on the motor data provided by the motor drive control circuit, the angle information of the valve plate provided by the downhole communication circuit and switched working mode, and send the control sequence to the motor drive control circuit so that the motor drive control circuit controls the motor to work in switched working mode.

10. A mud pressure wave signal modulation method, which is applied to a mud pressure wave signal modulation apparatus, wherein the mud pressure wave signal modulation apparatus comprises a motor, a valve plate, a main control circuit, a motor drive control circuit, and a downhole communication circuit;
wherein the valve plate is driven by the motor to be rotated around an axial direction perpendicular to a flow direction of drilling fluid, and a cross-section for controlling a size of an actual flow channel of the drilling fluid in a drilling fluid channel is formed through the rotation of the valve plate; the motor and the valve plate are disposed in the drilling fluid channel, and the drilling fluid channel, the main control circuit, the motor drive control

Assignees

• China Nat Petroleum Corp
• Cnpc Eng Tech Res & Dev Co Ltd

Inventors

• Wang Jiajin
• Mao Weimin
• Ai Weiping
• Fan Yifeng
• Dou Xiurong
• Jia Hengtian
• Wang Peng
• Wei Zhigang
• Wang Lei
• Guo Xianwei

Classifications

• E21B44/005 Primary

  Below-ground automatic control systems · CPC title

• E21B4/04

  Electric drives (E21B4/12 takes precedence) · CPC title

• E21B47/18

  through the well fluid {, e.g. mud pressure pulse telemetry} · CPC title

• E21B47/20 Primary

  by modulation of mud waves, e.g. by continuous modulation · CPC title

• E21B21/08

  Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure (valve arrangements therefor E21B21/10) · CPC title