LWD FORMATION SAMPLING TO SURFACE WITHOUT TRIPPING
Publication Date: 2010-Sep-17
The IP.com Prior Art Database
This is a method of performing formation sampling with LWD assembly. The sample is extracted from the formation with the LWD and stored into a transportable tank or capsule. The tank or capsule may be retrieved from the ID of the drill stem using wireline or slickline. A small capsule or a series of small capsules may be injected into the annualus and circulated to the surface. The advantage is to perform countinous formation sampling with LWD assembly with out tripping out.
TITLE: LWD FORMATION SAMPLING TO SURFACE WITHOUT TRIPPING
“This is a method of performing formation sampling with LWD assembly without tripping out of the hole. Conventional LWD sampling systems require pulling the instrument and tripping the drill pipe to the surface to collect the sample.
The sample is extracted from the formation with the LWD formation testing assembly (i.e.-FAS) and stored into a tank in a “ tank carrier section”. Each tank is selectively filled at the specific formation location as conventional formation testing. After filling the tanks, each tank is placed into the annulus of the tank carrier for retrieval. The annulus of the tank carrier section aligns with the annulus of the drill pipe. A wireline or slick line with a spear is lowered into the annulus of the drill pipe. The spear latches onto the tanks and the tanks are pulled to the surface. Drilling continues, the formation fluid samples are retrieved and the drill pipe is not tripped out.
Another method of sampling formation without tripping out of the hole is the capsule or egg method. The formation testing assembly collects the sample. The formation fluid samples are stored in small capsules or eggs, sealed and ejected into the wellbore at TD (total depth). The capsule or eggs are circulated to the surface with the flow of drilling mud. The capsules of eggs may be collected at the shaker or a specific trapping device at the surface.”