Benefits of Obtaining Log Data in Horizontal Wells in the WCSB

Abstract

Obtaining log data from horizontal wells has in the past been considered a very difficult and expensive task. Added to this is the question as to whether log data presented any value as far as reservoir understanding, production enhancement or completion techniques were concerned. The perception that the capital expense of logging cannot present an economic return has resulted in a small minority of horizontal wells being logged. Reeves Wireline has used the Compact Memory Logging system for a number of clients where there has been a clear demonstration of the value of logging. Introduction While the operational logistics of obtaining log data from the horizontal section of a well has improved in the last few years the understanding that the data can justify the expenditure is lagging far behind. The methods available to obtain data include MWD, L WD, wet connect pipe conveyed wireline logging and Compact Memory wireless logging. Each method offers its own benefits. These range from providing lithology information while drilling to identifying lithology, rock parameters and fluid interfaces. Although this information can be readily obtained, the economic justification for anything beyond geosteering seems to be a cloudy issue. The benefits of logging will be discussed and in particular, examples of specific data obtained from Reeves Compact Memory Logging (CML) pipe conveyed suite of tools. Reeves Wireline Services has been utilizing wireless pipe conveyed Compact Memory Logging (CML) services for a number of different operators for over two years. A full suite of log data can be obtained that includes array induction (shallow, medium and deep responses), dual spaced neutron and photo density porosity, Pe, gamma ray, compensated sonic and hole size caliper. The smaller size, ease of conveyance and unprecedented bend radius capability of Reeves Compact Memory Logging tool string is ideal both operationally and economically for newly drilled horizontal wells as well as previously drilled wells that may require remedial assessment.

The Development and Testing of a Garaged Open Hole Logging System for High Angle Wells and Bad Hole Conditions

“…We looked at data from over 80 memory logging operations to assess the measurement quality and interpretation value of open hole data from wireless logging operations in high angle wells (4) . Demonstration of value is important because large numbers of horizontal wells are currently logged with basic measurements only.…”