Drilling mud must be disposed of in a safe manner. Drilling mud contains additives to facilitate the drilling process and also the geological components from the locations where the drill head is.
- - 1605 - [Jamuary 9, 2013] - Oilfield Review, Claudio Brufatto et al. - "From Mud to Cement — Building Gas Wells"
- "As demand for natural gas increases, wellbore construction across gas-bearing formations takes center stage. With few cost-effective remedial measures available, prevention of annular gas flow and sustained casing pressure is key to drilling and completing long-lasting gas wells.
The science of constructing gas wells is thou- sands of years old. Legend has it that the Chinese dug the first natural gas well before 200 BC and transported the gas through bamboo pipelines.
Subsequent well-construction history is unclear until 1821, the year of the first US well drilled specifically for natural gas. This well, in Fredonia, New York, USA, reached a depth of 27 ft [8.2 m] and produced enough gas to light dozens of burners at a nearby inn."
- - 1649 - [NA] - Oil & Gas Journal, Tommy Warren - "Technology gains momentum - Rotary-steerable technology-Part 1"
- "Rotary-steerable systems possess clear advantages, both technologically and economically, over many mud motor-based drilling systems.
The service industry is responding to this by providing operators with new tools, expanding their ability to drill extended-reach and underbalanced wells, smooth out well trajectories, and optimize well configurations for production enhancement.
Ultimately, motor-based directional systems may eventually be replaced by rotary-steerable alternatives, except for those cases where a downhole motor is needed for "nondirectional attributes."
This first part of a two-part series describes the technological differences between conventional mud motor-based directional drilling systems and rotary-steerable systems. The second part defines implementation issues that are of concern to the operator."
- - 1650 - [December 21, 1998] - Drilling Contractor, Linda Hsieh, assistant managing editor - "Rotary steerables: Cost, reliability still key; higher dogleg capability, downhole motor integration also on asking list"
- "Once upon a time, the land drilling industry dreamed of a rotary steerable system that would replace the downhole mud motor. The system would provide accurate downhole directional control while rotating the drill-string at all times, thereby boosting ROP and improving efficiency. It didn’t have to be fancy, but it had to be low cost.
At least, that’s what the industry thought it wanted. It turns out, however, that just because onshore drilling is a lower-cost market doesn’t mean it necessarily needs only lower-specification equipment."