A brief acoustic logging-while-drilling technology
Logging while drilling (LWD) in recent years, the rapid rise of advanced technology.
It combines drilling technology, and well logging techniques and other techniques described in one reservoir, logging job while drilling, reduces the time occupied by the wellsite drilling rig, the drilling cost from logging integration. Compared with a conventional wireline, in addition to cost savings, logging while drilling has the following advantages
(1) from the measurement information speaking, LWD is not yet in the mud invasion or intrusion formation measurement information is not deep, and mudcake rinse with not yet formed, the measured curves obtained more accurate and better reflect the original formation of the real information, such as the acoustic travel time and the like.
(2) from the guide in terms of drilling, logging-while-drilling overpressure can be detected in advance to the formation, in order to guide the drilling mud formulation, increase drilling safety factor. It is also possible according to the log information, analysis of the advantageous hydrocarbon direction, determines the direction of drilling, geosteering enhanced functionality.
(3) adapt to the environment from the perspective, in highly deviated wells, horizontal wells or special geological environment (e.g., high voltage and ground expanded clay), a wireline difficult or risky operations that can not be performed when the logging while drilling can be replaced. Currently at sea, almost all drilling activities are used while drilling technology.
Because of these advantages, acoustic logging while drilling as an important part of the LWD in recent years have achieved great development. Overall, foreign matter in the drill with the study of basic theory of acoustic logging instrument or are more mature in terms of research and development, and domestic-related problems in recent years for sonic logging while drilling done a lot of work. Bold Style
