By Fikri Kuchuk, Florian Hollaender and Mustafa Onur (Eds.)
This reference provides a complete description of move via porous media and options to strain diffusion difficulties in homogenous, layered, and heterogeneous reservoirs. It covers the basics of interpretation recommendations for formation tester strain gradients, and pretests, multiprobe and packer strain brief checks, together with by-product, convolution, and pressure-rate and pressure-pressure deconvolution. Emphasis is put on the greatest probability technique that permits one to estimate errors variances in strain info in addition to the unknown formation parameters.Serves as a coaching guide for geologists, petrophysicists, and reservoir engineers on formation and strain brief testingOffers interpretation options for instant software within the fieldProvides precise assurance of pretests, multiprobe and packer strain brief assessments, together with by-product, convolution, and pressure-rate and pressure-pressure deconvolution
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Extra info for Pressure Transient Formation and Well Testing
Static characteristics which describe the performance of the gauge under stabilized temperature conditions with respect to an ideal response, and 2. Dynamic characteristics which describe the performance of the gauge when it is submitted to varying pressure and temperature conditions. Static parameters describing the transducer performance at static conditions are: • • • • Accuracy, Resolution, Stability, and Sensitivity. Accuracy is the difference between a measured value and the true value generated by a reference standard DWT (dead weight tester).
I NTRODUCTION In this chapter, we review the basic principles of pressure transient flow regimes. In order to achieve this, first we present the well-known wellbore pressure solutions and unit impulse responses for basic formation and well testing flow geometries. Unit impulse responses will often be used in the succeeding chapters. In this book, we often use the words sink or source. For the purpose of clarification, it is important to note that the source refers to a point in the system where the fluid is to be added (injected), while the sink refers to a point in the system from which the fluid is to be removed (withdrawn).
Combinable quartz gauges have an accuracy about 1 psi over a range from atmospheric pressure to 15,000 psi at temperatures 35 ◦ C to 175 ◦ C [95 ◦ F to 350 ◦ F]. , 1992). 003 psi (@ 15,000 psi; 1-sec sampling). It should be pointed out that most formation and well test setups now have one high resolution quartz and strain pressure sensor. In addition to pressure sensor characteristics, the setup, gauge carriers, and all associated electronics affect measurement metrology. As stated above, downhole pressure is the most critical measurement acquired during formation and well tests.
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