Pason Systems Corporation

Apple Inc.

Telecommunications Research Laboratories

Stephen Lai

Peter Zahariev Rashev

Geoffrey G Messier

Christopher Darren Salvador

Sean Kristjansson

Kenneth Charles Horovatin

Dean Tremaine

Timothy Keith Walter

A method for drilling a new oil or gas well in a selected geographical location includes extracting drilling modes from historic drilling data obtained from a group of drilled wells in the selected geographical location using a pattern recognition model. Each drilling mode represents a distinct pattern that quantifies at least two drilling variables at a specified drilling depth. The method also includes selecting a sequence of drilling modes at positions along a reference well as reference drilling modes that represent more efficient values for a selection of one or more of the at least two drilling variables compared to other extracted drilling modes; associating drilling parameter settings with the reference drilling modes; and drilling the new oil or gas well applying at least some of the drilling parameter settings.

Method and apparatus for drilling a new well using historic drilling data

A method for detecting stick-slip in a drillstring includes (a) measuring a parameter that is a function of a torque applied to the drillstring by a top drive system over a selected time period, the measuring being performed by at least one surface sensor that produces measurement data including torque values over a frequency range; (b) filtering out measurement data that has a frequency outside a selected frequency band, the selected frequency band including a resonant frequency of the drillstring; (c) identifying a minimum and a maximum torque value in the filtered measurement data and determining a difference of these two values; (d) determining a surface stick-slip index by dividing the difference of the maximum and minimum torque values by an average torque value over the selected time period; and (e) displaying the surface stick-slip index on a display.

Method and apparatus for detecting downhole torsional vibration based on measurement of surface torque

A transceiver for a cellular telephone network includes a transmitter and a receiver that receives transmitted signals, as well as a receiver. A spectral analyzer analyzes the received signals and a controller coupled to the spectral analyzer controls the transmitter and receiver as a function of the spectral analyzer analysis.

Transceiver with spectral analysis

A system and method is presented where a low-IF architecture can be used to allow existing wireless standards to be used for joint wireless/power-line channel transmission in the provision of diversity communications channels. Diversity combining of wireless and power-line channels can be employed, wherein the input noise to the maximum-likelihood detector can be Class A-distributed. For uncoded BPSK, the BER can be a function of PLC impulsiveness and can improve wireless-only BER by orders of magnitude when PLC SNR &#x3e;10 dB. The error performance can be equivalent to BER of the static PLC channel for low wireless SNR and can improve with a slope of &#x2212;1 at high wireless SNRs. The inflection point between these two regions can occur at approximately 0 dB when PLC noise is Gaussian, and increases above 20 dB as the noise becomes more impulsive.

Growing community of inventors

Calgary, Canada

Stephen Lai