
TY  - JOUR
A1  - Gearhart, M. 
T1  - FIELD RESULTS USING MEASUREMENT-WHILE-DRILLING DIRECTIONAL SYSTEMS IN LONG BEACH, CALIFORNIA
JF  - The APPEA Journal
JO  - The APPEA Journal
Y1  - 1981
VL  - 21
IS  - 1
SP  - 213
EP  - 221
KW  - 
UR  - https://doi.org/10.1071/AJ80023 
N2  - One of the more extensive uses of directional drilling anywhere in the world has been in the development of the East Wilmington Oil Field in Long Beach, California. The average well is deviated from vertical in excess of 50&#xb0; and wells with a maximum deviation in the 70&#xb0; to 80&#xb0; range are not uncommon before they are dropped off to 50&#xb0; or less when penetrating the completion interval. Over 780 wells have been drilled in this field to date, requiring the highest degree of control and accuracy in order to avoid intersection of other wells and to obtain proper bottom hole spacing. The Measurement-While-Drilling (MWD) directional system has been tested on several wells and proven to provide the required accuracy, along with many advantages over past methods, used in the field development.Accurate transmission by MWD of bottom-hole measurements to the surface is provided by mud pressure pulses generated in the drill pipe downhole and detected by a pressure transducer includes the means for detecting, recording and processing these pressure pulses, to translate the information from the pressure pulses to rig floor displays usable by the drilling crew. 
ER  -

