Wireline formation tester wireline tool is a tool to measure the downhole pressure of the formations. The list of acronyms and abbreviations related to rft repeat formation tester. Eighteen tests were attempted, with six good tests, and two formation fluid samples recovered. Repeat formation tester rft data are used for interpreting some reservoir characteristics such as the nature of fluids and contacts between fluids for the. The repeat formation tester which can make any number of accurate pressure tests in one run in open hole, has applications in the determination of reservoir pressure, fluid density, fluid contacts, differential depletion, reservoir intercommunication and effective permeabilities of invaded and uninvaded zones. The repeat formation tester is an important tool for production and reservoir engineering. Packer seal fails pressure builds to hydrostatic better idea dual pretests to relieve supercharging, clean up the point and for confirmation of pressure normal pretest 5,000 5,400 5,800 6,200 6,600 7,000 100 150 200. Provide an accurate value for true formation resistivity c. This thesis focuses on the testing of the quality of the recovered oil samples and the pvt measurements performed in the lab. The effect of filtrate invasion and formation wettability. These testers can mix the fluids sampled from severalsettings in one. The repeat formation tester rft is a wireline device primarily designed to obtain the vertical pressure distribution in a reservoir from within pressure distribution in a reservoir from within uncased wells. Determination of formation pressure the formation pressure for each depth was obtained by plotting pressure versus time for each test.
The srft slimhole repeat formation tester makes it possible to accurately measure pressures and conduct mobility testing in small or restricteddiameter boreholes. A question that usually comes up is whether a repeat formation tester rft generally referred to as mdt, which specifically refers to the tool from schlumberger can replace a full production test generally referred to as dst or well test. The results indicate that the san andres and the lower grayburg are in different pressure regimes, and the a1 zone is depleted. The repeat formation tester rft is the preferred method for.
Pressure builds to formation pressure and is stable dry test. Repeat formation tester report listed as rftre repeat formation tester report how is repeat formation tester report abbreviated. Omar anwar elganzoury kirelos saad samir repeated formation tester. Formation fluid pressure from repeat formation testers aapg wiki. Although the principle of operation of these two techniques can be considered similar creating a pressure disturbance in the reservoir by moving fluids. A reservoir pressure survey can be generated for connectivity analysis, along with the pressure gradient for fluid density and fluid contact information and fluid mobility determination to aid in samplingpoint selection. Layer pulse testing using the repeat formation tester onepetro. Abstract a conventional pulse test provides estimates of average. The list of acronyms and abbreviations related to rfmts repeat formation tester. We also offer offsite laboratory services for core and sample analysis by weatherford laboratories.
Formation pressure is measured by the formation sampler when it is extended from the tool to contact the formation. What is the importance of repeated formation tester in reservoir evaluation. The goal of this study is to analyze repeat formation tester rft data to determine pore size distribution profile along wellbore. Formation fluid pressure from repeat formation testers. This tool offers the capability of taking any number of pressuredepth measurements with a single logging run. Everything formation testing milestones in wireline. A method of recovering fluid pressures with a wireline.
Fluid samples from the formation can also be taken with the tool. What is the importance of repeated formation tester in. Pdf characterizing permeability with formation testers. It measures pressure at specific points on the borehole wall. A question that usually comes up is whether a repeat formation tester rft generally referred to as mdt, which specifically refers to the tool from schlumberger can replace a. The repeat formation tester rft tool was designed to measure formation pressure quickly and accurately.
The true reason why americas enemies still fear the b1 bomber duration. Unfortunately, not all of that money is well spent. Two types repeat formation tester rft and formation. Formation testing basics crains petrophysical handbook. A detailed explanation for one of the most substantial tools in the wireline formation testers family including the history of wireline formation testers family, the main functions of the tool, the difference between rft and dst, the operation of the tool, the pressure profiles, log presentation, log interpretation, corrections with other tools and permeability calculations from. Use repeat formation tester for determination of some. Normally if additional tests are required the tool has to be brought out of the hole, cleaned, the sample chamber emptied and some parts replaced shaped charge for example leading to a loss of. Response of a singleprobe formation tester, spe formation evaluation7, no. The latest advancements in this technology enable the tester to take up to three pvt samples with basic fluid identification. Repeat formation tester rft and formation interval tester fit. These tools are capable of taking multiple samples of fluids and pressure.
Evaluation of permeabilities determined from repeat formation tester measurements made in the prudhoe bay field, paper spe 14400, presented at the spe annual technical conference and exhibition, las vegas. To achieve a high degree of accuracy, the rft tool makes use of advanced electronic circuitry and digital pressure readout. The 3 38in srft slimhole repeat formation tester features as cqg crystal quartz gauge to bring wireline formation testing for pressure. Determination of pore size distribution profile along. Repeat formation tester report how is repeat formation. Additionally, a repeat formation tester was employed in an effort to obtain reservoir pressure data. The rft is run into the hole and a continuous digital readout of hydrostatic pressure is obtained. Repeat formation tester rft and the translation is 100% complete.
Saturation resistivity logs these logs are designed to. Modular formation dynamics tester, powerpak, rft repeat formation tester, schlumberger perform and spin doctor are marks of schlumberger. Rft pressure data can be interpreted to obtain formation permeability and actual formation pressure that can be applied for a better understanding of petroleum reservoirs. Use repeat formation tester for determination of some reservoir. Provide a quick indication of formation pressure, hydrocarbon content and producibility. Pdf determination of pore size distribution profile along wellbore. Repeat formation tester rft the repeat formation tester can take an unlimited number of formation pressure measurements and up to two fluid samples in a single trip in open hole.
Repeat formation tester rft the preceeding tools allow only one sample to be collected and one pressure test to be made on each descent in the hole. Repeat formation tester how is repeat formation tester. The repeat formation tester rft measures point pressures generally in an. Pdf pressure profile dengan metode repeat formation. Yes, in fact the third appraisal well drilled tgt 4x to test a separate fault block due north of the tgt 3x encountered what appeared to be residual saturations in the ilbh5.
The padded tool seals formations and pumps fluid until resistivity indexes indicate formation fluids are present. The earliest formation tester ft used a hydraulic pad to obtain good contact with the borehole wall, then a perforation charge was. Repeat formation tester geological applications of. This page is a translated version of the page dictionary. Formation testing basics formation testing on wireline was developed in the mid to late 1950s to provide a faster and less expensive method of formation evaluation than conventional drill stem testing dst.
Point measurements are made by inserting a probe into the formation through the mud cake and withdrawing a fixed volume of fluid. At any point in the hole the tool may be actuated to force a rubber pad against the wall of the hole, and a tube in the centre of the pad is forced hard against the. Tester rft, repeat formation sampler rfs, shown in fig. Metode yang dipakai adalah repeat formation tester rft wireline formation tester wft. Srft slimhole repeat formation tester schlumberger. Used to establish formation pressure, permeability, and reservoir and formation fluid characterization, there are three major methods of formation testing that help to reveal the downhole. These tools are capable of taking multiple samples of fluids and pressure measurements in the borehole without withdrawal. Determination of pore size distribution profile along wellbore. When formations are unconsolidated andor mud conditions prevent running a conventional drill stem test, pressure information and formation fluid samples can be obtained by using a wireline test tool called a repeat formation tester. Detecting of gas zones in khatatba formation, qasr field. The repeat formation tester rft tool was designed to measure formation pressure downhole via wireline. Pdf determination of pore size distribution profile.