Downhole Test Tools Optimize string design to meet your unique test objectives Selecting the right equipment for your downhole test string is key to efficiently meeting your test objectives and, ultimately, accurately characterizing your reservoir. Schlumberger has a wide variety of downhole test tools and equipment that allow you to design an optimal test string to help you meet your test objectives—in any operating environment—with certainty. Accommodate changes in string length caused by temperature and pressure during drillstem testing. Slip joints are not required when using the CERTIS system.
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Purpose To enable the wellbore to be shut in downhole rather than at surface, the benefit of this is to allow for a quicker well build up as it does not have to pressurize the tubing. Operation The shut in tool is run in the open position with the inner sleeve pinned so that it will not close prematurely. Once set the in the desired location you can flow the well or perform any other function needed while the tool is open. When readyto shut the tool in, run the appropriate prong with wireline and jar down on the inner sleeve of the shut in tool, shearing two small brass pins and move the inner sleeve down blanking off the ports and effectively shutting in the well bore.
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Down Hole Shut In Tool
The tool comes with a kobes equalizing plug in the bottom end of the shut in tool so that pressure can be equalized above and below before pulling the assembly. This is done by running another prong which is made to pass through the inner sleeve and break off the kobes plug which will allow the pressure tomigrate up through the tool. The tool then can safely retrieve the shut in tool. This tool can be easily serviced and pinned again in the field for multiple runs. The kobes plug will need to be replaced after each use. Precautions Ensure kobes plug is sheared and well has equalized before unlocking assembly.
SPE Members Abstract In this paper, a brief description is given to operational procedure involved in acquiring transient data using a down hole shut-in tool. Field cases (Maracaibo Lake are presented to show the advantages of this technique in active wells and for cases where reservoir pressure is below bubble point. A comparison is made between this technique and the one that is based on simultaneous measurements of transient flow rate and pressure. The benefits both from an economic point of view and from the reservoir evaluation side using this method are presented. A main result derived from this work is that the use of the down hole shut-in tool reduced the build-up time by a factor of 10 in some cases for tests conducted in Maracaibo Lake fields. A considerable saving in differed oil production was gained besides the benefits of having pressure transient data not strongly affected by wellbore storage and phase segregation which permits a better reservoir evaluation. Introduction Reservoir description using pressure transient analysis is a well known and established methodology.
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Recent advances, both in reservoir models and equipment resolution for field well testing, show that successful reservoir evaluation results can be obtained if appropriate test equipment is used to reach the objectives. In the area of pressure transient data analysis, significant improvements have been reached, such as the use of the pressure derivative as a flow regime diagnostic tool and the regression both linear and non linear for the overall pressure profile analysis. Even though we are still faced with the inverse problem that is to say different models problem that is to say different models can match the same pressure transient data the use of the computer and the numerical simulation approach will definitely help in choosing the right reservoir model to match. In the area of testing equipment and pressure gauges with the advent of quartz type of gauges, a resolution as low as 0.01 psig can be easily obtained. This type of gauge is commonly used in may tests. Regarding equipment for testing, advances have been reached when testing exploratory wells (DST type of tests).
Deeper formations and temperatures above 300 degrees F are tested every day and they pose a challenge regarding equipment performance.
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