High-Speed Transmission of Annulus Pressure-While-Drilling by Data Compression

摘要

A method for transmitting data from a downhole tool to a surface location includes running a downhole tool into a wellbore. The downhole tool includes a pressure sensor. An annulus pressure in the wellbore is measured at a first time, using the pressure sensor, to produce a first pressure measurement. The first pressure measurement is compressed to produce a reference sample. The reference sample is transmitted to the surface location. The annulus pressure in the wellbore is measured at a second time, using the pressure sensor, to produce a second pressure measurement. A difference between the first pressure measurement and the second pressure measurement is determined to produce a first delta pressure measurement. The first delta pressure measurement is compressed to produce a first compressed delta pressure measurement. The first compressed delta pressure measurement is transmitted to the surface location.

主权项

1. A method for transmitting data from a downhole tool to a surface location, comprising:
running a downhole tool into a wellbore, wherein the downhole tool comprises a pressure sensor; measuring an annulus pressure in the wellbore at a first time, using the pressure sensor, to produce a first pressure measurement; compressing the first pressure measurement to produce a reference sample; transmitting the reference sample to the surface location; measuring the annulus pressure in the wellbore at a second time, using the pressure sensor, to produce a second pressure measurement; determining a difference between the first pressure measurement and the second pressure measurement to produce a first delta pressure measurement; compressing the first delta pressure measurement to produce a first compressed delta pressure measurement; and transmitting the first compressed delta pressure measurement to the surface location.