In 1999, Pathfinder Company developed the first FPTWD tester, that is, the Drilling Formation Tester (DFT), where the structure of double packers was designed, as shown in Figure 1; the main processes of DFT testing are as follows : (1) locate the down-hole position of DFT by using gamma logging data; (2) send a starting command to activate the down-hole DFT and to set the packer; (3) let the down-hole DFT launch the test sequence, including pressure drop, pressure buildup, and unsealing processes.
Nouh, "Determination of some reservoir characteristics of the Bahariya Formation in Bed-1 Field, Western Desert, Egypt, by using the repeat formation tester," Petroleum Science and Technology, vol.
Boonen, "Applications for an LWD formation tester," in SPE/IADC Drilling Conference, Amsterdam, Netherlands, March 1999.
Chen, "On real time data processing method of formation tester while drilling (geotap)," Well Logging Technology, vol.
Rated to 450 deg F (232 deg C) the PressureXpress-HT tool provides accurate pressure gradients and overall data quality not achievable by conventional high-temperature formation tester
Present operations - after conducting a wiper trip at 1551mRT, Backreef-1 will now drill ahead from the current depth of 1551mRT to 1650RT (revised TD) prior to running electric logs and possibly a Formation Tester
"But before we did that, we used a Schlumberger RFT (repeat formation tester
), a tool that goes down the drill-hole on the end of a wire.
Formation measurements (that provides a measure of density distribution in a sheet) were performed using a formation tester which is based on beta particle absorption.
The following equations were used to calculate the distribution of basis weight using a formation tester based on beta particle counts:
A computer program in MATLAB was developed that reads the matrix of beta counts created by the formation tester and applies equation (1) to generate a two-dimensional color image and a histogram corresponding to the distribution of basis weight.
Machinery manufacturer Nomura Shoji, Tokyo, Japan (Stand F-52), will debut a formation tester
, Model "FMT-2000." The FMT-2000 is a simplified formation tester
for paper and nonwovens - based on image analysis - that consists of a sample stage with transmitted light illumination, a two dimensional CCD TV camera, a computer, printer and a shading hood to eliminate external direct light influences.
The second category of downhole tools includes formation testers
and fluid samplers, which provide spatially discrete data.