| Popis: |
Abstract High-angle wells are becoming coin inon place, particularly in offshore areas. Because of this, it particularly in offshore areas. Because of this, it has become important to increase the deviation angles at which wells can be conventionally logged. Moreover, firm planning factors are needed to decide whether to try gravity-descent or pump-down tools as the first attempt at logging high-angle holes. This paper describes work which contributes significantly to both objectives. New equipment has been introduced to reduce hole friction, increase tool weight and flexibility, and provide a surface indication of push or pull forces at provide a surface indication of push or pull forces at the tool head. These devices have been extensively field-tested in wells with deviations ranging from 45 to in excess of 70 degrees, in the Gulf of Mexico offshore area. Maximum deviations successfully logged by use of the new equipment were somewhat less than the limits predicted by theoretical and laboratory work, but there predicted by theoretical and laboratory work, but there has been a dramatic improvement in success ratios for logging these high-angle wells. |
