System and method for transmission of pulses

Abstract

A method and a system for monitoring one or more control parameters in a borehole, wherein a downhole tool is mounted in a drill string and is able to measure at least one control parameter using suitable sensor units is provided. The downhole tool generates at least one pulsating signal based on the measurements, wherein this pulsating signal includes a single pulse where the pulse length is determined as function of the value of the measured control parameter. The pulse length may further be determined using a selected resolution for that control parameter. The pulsating signal is then transmitted to ground level via the drilling fluid where it can be read by simply monitoring the pump pressure. A simple test can be performed before starting the operation of the drill string.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority to PCT Application No. PCT / DK2017 / 050273, having a filing date of Aug. 25, 2017, which is based on DK Application No. PA 2016 70742, having a filing date of Sep. 21, 2016, the entire contents both of which are hereby incorporated by reference.FIELD OF TECHNOLOGY[0002]The following relates to a method for monitoring one or more control parameters in a borehole, wherein the method comprises the steps of operating a drill string with at least one downhole tool in the borehole, generating at least one pulsating signal via the at least one downhole tool, and transmitting the at least one pulsating signal to a ground level.[0003]The following also relates to a system for monitoring one or more control parameters in a borehole, comprising a drill string with at least one downhole tool positioned in the borehole and an operating system located at a ground level, wherein the operating system is configured to operat...

AI Technical Summary

Benefits of technology

The invention is a simple and inexpensive system for transmitting data from a downhole tool. It allows for fast and accurate activation of the tool without the need for a surface decoding system or additional training of rig personnel. Overall, the invention provides a more efficient and reliable method for conducting drilling operations.

Problems solved by technology

However, this drift indicator system provides limited inclination data and cannot be used to detect other type of data.

Secondly, a number of drift indicator systems have to be installed by specialised technicians and require suitable training of the rig personnel to operate this drift indicator system.

This increases the installation and operation costs as specialised engineers or technicians are required to install and operate the MWD system.

This requires complicated decoding systems on ground level, resulting in expensive equipment that further needs to fulfil the Atex requirements.

This further reduces the power consumption and, thus, increases the operating time of the downhole tool.

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