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Methods and a system for well logging communication

a communication system and well technology, applied in the field of methods and systems for well logging communication, can solve the problems of difficulty in running tools from different vendors in one string, and achieve the effect of low cos

Inactive Publication Date: 2016-12-15
WU RUOXI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent describes a well logging communication system that uses multiple low-cost, low-power modems for communication in well tools. The system has the ability to communicate using burst OFDM modulation for the uplink and Phase Pilot Shift (PSK) modulation for the downlink. The downhole tools with modems can communicate with the surface through the wireline and with other tools without modems through local downhole buses. The technical effects of this system include increased speed and simplified design.

Problems solved by technology

Different tool suppliers have different downhole tool bus which makes it very difficult to run tools from different vendors in one string.

Method used

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  • Methods and a system for well logging communication
  • Methods and a system for well logging communication
  • Methods and a system for well logging communication

Examples

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Embodiment Construction

[0013]FIG. 1 shows a conventional well logging communication system. The surface modem 101 communicates to the modem 103 of downhole telemetry 104 through the wireline cable 102. The wireline cable 102 provides the uplink and downlink signal channels, provides power to the downhole tools, and holds the weight of whole downhole tool string. The downhole telemetry 104 communicates to the surface through the wireline cable 102 and to other downhole tools 105, 106, 107 through the downhole tool bus 108.

[0014]FIG. 2 shows an exemplary well logging communication system of the embodiment. The exemplary system shows how the system works with multiply downhole modems M1203, M2205, M3206, and multiple downhole tool buses 204, 207.

[0015]The surface modem 201 communicates to the downhole tools with modem 208, 210, 211 through the wireline cable 202.

[0016]The downhole tool 208 with modem 203 communicates to the surface through the wireline cable 202 and to one downhole tool 209 through the downh...

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Abstract

Methods and a system for communication between the well logging surface equipment and downhole tools. A well logging communication system comprised of a surface modem, one or more downhole modems for communication to the surface through one or more signal channels of the wireline. A system with zero, one or multiple downhole tool buses.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]U.S. Patent Documents8,362,916B2January 2013Tjhang et al340 / 854.36,552,665B1April 2003Miyamae et al340 / 854.96,753,791B2June 2004Wei et al340 / 854.92004 / 0085988A1May 2004Gardner370 / 4117,132,958B2November 2006Dodge et al340 / 854.38,217,802B2July 2012Weerasinghe340 / 854.9BACKGROUND OF THE RELATED ART[0002]The arrays of high definition sensors in downhole tools generate large amounts of data on the borehole. A communication system is utilized to send the real-time data from the downhole tools to the surface. There are two types of data involved: uplink and downlink data. To get the expected data from downhole tools, data is sent from the surface to downhole tools for control; this data from surface to downhole tools is downlink data. The data sent from downhole tools to surface is called uplink data. The rate demanded for downlink data is low in comparison to the high uplink data rate needed.[0003]Running multiple tools together in one string sa...

Claims

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Application Information

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IPC IPC(8): E21B47/12
CPCE21B47/12
Inventor WU, RUOXIWU, ZHIMING
Owner WU RUOXI