Unlock instant, AI-driven research and patent intelligence for your innovation.

Conditioning circuit system for weak signals of well logging during drilling

A technology of tiny signals and conditioning circuits, applied in surveying, earth-moving drilling, wellbore/well components, etc., which can solve the problems of difficult signal processing and weak detected signals, etc.

Pending Publication Date: 2018-04-24
BITSWAVE SUZHOU
View PDF0 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the downhole near-bit bit WOB and torque measurement, due to the complex downhole environment, the detected signal is weak and accompanied by strong noise signals, which will cause difficulties in signal processing

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Conditioning circuit system for weak signals of well logging during drilling
  • Conditioning circuit system for weak signals of well logging during drilling
  • Conditioning circuit system for weak signals of well logging during drilling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] This embodiment provides a logging-while-drilling micro-signal conditioning circuit system, such as figure 2 As shown, it includes strain bridge module, amplification module, filter module, A / D conversion module and micro control unit MCU.

[0051] The strain bridge module includes a strain bridge composed of resistance strain gauges pasted on the drill string, and the strain bridge includes a pressure-on-bit measurement strain bridge and a torque measurement strain bridge. The pressure-on-bit measurement strain bridge and the torque measurement strain bridge respectively form independent data acquisition channels with the amplification module, filter module, A / D conversion module and micro control unit MCU.

[0052] In this embodiment, the strain bridge adopts a congruent equal arm bridge.

[0053] During different drilling processes such as drilling, tripping in and tripping out of the drill collar, the stress and movement patterns of different parts of the drill co...

Embodiment 2

[0065] This embodiment provides a high-temperature power supply module circuit, which can supply power for downhole instruments, such as Figure 5 As shown, the power supply of the measurement circuit is to convert P5V and N5V high-temperature power modules into power supplies for the signal channel and the reference channel.

[0066] The high temperature power supply module circuit includes an input module, a conversion module and an output module, the input module includes a voltage input terminal for inputting a voltage to be converted; the conversion module is connected to the input module, and the conversion module includes a positive voltage conversion module and a negative voltage conversion module, the negative voltage conversion module uses the output voltage of the positive voltage conversion module as an input voltage; the output module is connected to the conversion module, and the output module includes a voltage output terminal for outputting Converted positive a...

Embodiment 3

[0073] This embodiment provides a signal amplification circuit, such as Figure 6 As shown, since the output voltage of the strain bridge is a very weak signal, in order to detect this signal, it is amplified by a signal amplifier circuit. Since the output signal is accompanied by strong noise, it is necessary to increase the common-mode rejection ratio of the entire circuit, and the gain of the amplifier circuit cannot be too large, otherwise it will cause saturation. To this end, a method of two-stage amplifying circuit is adopted, including a first-stage amplifying circuit and a second-stage amplifying circuit.

[0074] The first-stage amplifying circuit includes a first amplifier, which is a general-purpose instrumentation amplifier, capable of obtaining a sufficiently high common-mode rejection ratio, and the gain is determined by the equivalent resistance Rg between pin 1 and pin 8 of the first amplifier. It is determined that Rg in this embodiment is the twenty-second ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to the field of well logging during drilling, and discloses a conditioning circuit system for weak signals of well logging during drilling. The conditioning circuit system for the weak signals of well logging during drilling comprises a strain-gauge bridge module, an amplification module, a filtration module, an A / D conversion module and a micro control unit (MCU), wherein the strain-gauge bridge module comprises a strain-gauge bridge formed by resistor strain gauges which are pasted to a drilling column, by means of the strain-gauge bridge, change of the resistance of the resistor strain gauges can be converted into the voltage signals, the amplification module comprises a two-stage amplification circuit and is used for amplifying the voltage signals outputted by thestrain-gauge bridge module, the filtration module is used for filtering out noise signals in outputted signals of the amplification module, the A / D conversion module converts voltage simulation signals which are subjected to filtration into digital signals, and the micro control unit (MCU) is used for conducting data processing on the digital signals processed through the A / D conversion module and obtaining measured engineering parameters. By means of the conditioning circuit system for the weak signals of well logging during drilling, real downhole bit pressure and torque can be measured, sothat a real-time basis is provided for a drilling engineer for accurate and fast well drilling parameter adjustment, well drilling mode changing and safe well drilling.

Description

technical field [0001] The invention relates to the logging-while-drilling field, in particular to a logging-while-drilling micro-signal conditioning circuit system. Background technique [0002] Logging while drilling generally refers to measuring formation petrophysical parameters during the drilling process, and using the data telemetry system to send the measurement results to the ground in real time for processing. Logging while drilling (LWD) technology is the key technology for geosteering drilling guidance, and it is very critical for the completion of large-angle wells, on-site decision-making, interpretation, real-time well site data acquisition, and horizontal well drilling design. [0003] Logging while drilling is a logging method that installs logging instruments close to the drill bit and measures various information of the formation just after the bottom layer is drilled. It performs drilling directional control by measuring formation inclination and azimuth...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/12
CPCE21B47/12
Inventor 刘策刘海霞
Owner BITSWAVE SUZHOU