Well completions are an integral part of providing safe, reliable and continuous access to underground resources such as oil, gas and geothermal resources. Completions are typically considered to be the final step of drilling engineering which includes processes such as setting casing, cementing, and perforating to reach the target formation. Completions provide the conduit from the resource to the surface. Although completions encompass a wide range of disciplines, several key factors ultimately determine the quality of the completion. One of those is cementing and centralizing casing within the wellbore. This white paper examines the current state of the art for centralizers in the context of well completions. The paper will include an introductory primer on well completions to provide the framework for the centralizer discussions. The types of centralizers currently available and how they are used will be discussed in addition to alternative centralizer techniques.

Well Information includes information on borehole activities such as drilling activity, counts on the number of boreholes completed, and number of shut-in's.Additional information includes the lease number, well name, spud date, the well class, surface area/block number, and statistics on well status summary.Additional files are available on well completions and well tests. All surveys are referenced to grid north in the native map projection of the block containing the surface location of the survey.For some old surveys the north reference was not marked and was assumed by BOEM to be grid north. In an effort to improve the quality of our downloadable data, we are now exporting bottom hole locations as calculated from the directional survey associated with the well. The coordinate values were derived using the North American Datum (NAD) 1927.