It was decided to mitigate this effect through the addition of a gas lift well in the Statfjord Øst field in order to both accelerate and prolong production from this prolific satellite. The SFLL project would therefore result in lower recoverable reserves on Statfjord Øst. As a consequence, the reservoir pressure in Statfjord Øst will decrease, resulting in an accelerated reduction of well potentials and finally, (around year 2013) the wells would stop producing due to lift problems.įig. The Statfjord Late Life (SFLL) project is currently underway, where the main purpose is to reduce the reservoir pressure and to convert the main field to gas production. It has been shown to have pressure communication with the very mature main field (fig. Introduction Statfjord Øst is a satellite field located northeast of the Statfjord main field. These laboratory measurements proved to be consistent with the observed effect of the lubricants in the field. In selecting the lubricant, different lubricants were tested using a novel laboratory instrument capable of measuring the coefficient of friction at elevated pressure and temperature. Comparing the two 8 ½″ sections drilled, the average off-bottom torque was reduced by 25 % after adding this specific lubricant to the drilling fluid. In the drilling phase, the apparent static friction factor decreased from 0.23 to 0.13 and the dynamic friction factor from 0.13 to 0.11. The selected lubricant was designed to stick to metal surfaces, and the result showed that the lubricant had a significant effect on both torque and drag forces. The use of an ultra-low viscosity drilling fluid resulted in a clean metal to metal contact between the casing and the drill pipe, which caused high static friction. ![]() This paper shows in detail how the addition of a lubricant to an oil based drilling fluid affected the lubricity significantly in the second of two comparable drill pipe runs, resulting in historically low coefficients of friction. Abstract Lubricants are often added to the completion or drilling fluid, in order to reduce friction between tubular equipment run into the well, and the wall of the well.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |