Method for compacting data transmitted with drilling well mud pulse

A technology of mud pulse and data compression, applied in the field of petroleum geological exploration

Inactive Publication Date: 2013-08-07
XI'AN PETROLEUM UNIVERSITY
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Problems solved by technology

This method proposed the concept of data compression while drilling for the first time in China, but ...

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  • Method for compacting data transmitted with drilling well mud pulse
  • Method for compacting data transmitted with drilling well mud pulse
  • Method for compacting data transmitted with drilling well mud pulse

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Embodiment Construction

[0018] The structural principle and working principle of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0019] A data compression method for logging-while-drilling mud pulse transmission, comprising the following steps:

[0020] Step 1. The encoding method used by the downhole instrument is PPM encoding, that is, the pulse position modulation encoding method. The value is determined by the time interval of continuous pulses. Except for the synchronization word, the width of all pulses is the same;

[0021] refer to figure 1 , showing how to get a single hexadecimal number from a single pulse after using PPM encoding:

[0022] a) The pulse position starts from the trailing edge of the previous pulse, which may be the trailing edge of a sync word or the trailing edge of the previous data;

[0023] b) Minimum pulse recovery time of two pulse widths from the trailing edge of the preceding pulse;

[0024] c) The pulse tim...

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Abstract

The invention provides a method for compacting data transmitted with drilling well mud pulse. The method comprises the following steps that step 1, an encoding method adopted by a downhole instrument is a PPM (pulse position modulation) encoding method; step 2, corresponding log parameters and transmission speed are configured for the downhole instrument; step 3, each measuring pup joint of a log instrument starts to acquire data; step 4, subtraction is performed on the subsequently acquired data and a first group of data, and the difference value is stored by using one byte; and step 5, if the difference value overflows, the group of data acquired during overflow serves as the first group of data, and circulation is sequentially performed, and if the difference value does not overflow, the difference value serves as data, after being subjected to PPM encoding, the data is sent to the ground, circulation is sequentially performed, and the data in the step is stopped to be acquired and uploaded until a pump closing signal is detected. The method has the advantages that the uploading efficiency of a downhole signal is improved, so that geosteering and formation evaluation are carried out to improve the decision ability of a field drilled well.

Description

technical field [0001] The invention belongs to petroleum geological exploration technology, in particular to a data compression method for mud pulse transmission of logging while drilling. Background technique [0002] Logging While Drilling (LWD for short) is not only measuring engineering parameters such as inclination angle, azimuth angle, tool face angle, but also measuring resistivity, natural gamma ray, neutron porosity, It is a logging method in which the formation petrophysical parameters measured in conventional logging such as density are sent to the ground in real time for processing by a data telemetry system to obtain real-time data. This technology requires that the logging instrument should be able to be installed in a small space in the drill collar, and can withstand high temperature, high pressure and strong vibration during drilling. The LWD data are measured before the formation invades or when it is very shallow, which more objectively reflects the cha...

Claims

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Application Information

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IPC IPC(8): H03M7/30E21B47/12
Inventor 刘之的
Owner XI'AN PETROLEUM UNIVERSITY
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