New System for Advanced Well Test Analysis

SPE Latin America Petroleum Engineering Conference

1992

Copyrighl1892, Sodoty of Pafrokwm Engkwers, Inc 'rids paper ivas preaantodat tie Sacond LatinArrwricsnPafrolsumH@nwiing Confarenco,II LAKC, o! !hs Sockfy of PetroleumEnglnoorahofdin Caraew, V-, Afamh& 11,19W s paper was sokctad for prasontationtq an SPE Prqram ComrrWaa followingrwfaw ef informationconlsinodin an abstract wbrMtod by ths author(a).Conlenta ef tha paw, as prasantad, have no! boon raviawad by the II LAPEC er tha SPE and are subjscf to corroctienby Iha authef(s). Tho malarial, aa prssantad, does not naceaaafi~rafbct any pesition of ha II LAPEC or lb SPE, ik offkora, er mstim. Paws praaantod at SPE mo61inesara subjocfto pulrkation m%w by EditoIM Cemn'ittoos & tha So$oly of Petrckum En@rira. Permission 10 copy la roabiied to an abafrsot of nd mwo Ihan sOQwords. Ilkatrstions may not ba coplarf. Tha hatract should contain wnapkaoua ac+mow!odgmont ef whom and by whom tha pafmr is prosan!wl. Write PWcationa Msnsgar, SPE, P,O.Sox S33SH RichardsonTX 7S$S3-SS3SU.S.A. Telex 7309S9 SPEDAL.,. .,

Reservoir Testing Using a Down Hole Shut-In Tool: Field Cases

Pacheco

SPE Latin America Petroleum Engineering Conference

1992

Pressure Transient Data Acquisition and Analysis of Pumping Wells State of the Art

SPE Latin America Petroleum Engineering Conference

Pacheco

Sierra

1992

SPE Members Abstract In this work the advances in pressure transient data acquisition and analysis of pumping wells are presented. A brief summary is presented on methods used in the past 20 presented on methods used in the past 20 years for testing pumping wells. A comparison is made between pressure data acquired using bottom hole gauges and that based on indirect calculation of the bottom hole pressure by determining the liquid level in the annulus acoustically measuring the surface annulus pressure, and calculating the bottomhole pressure, and calculating the bottomhole transient pressure. The quality of the acquired data using the previously mentioned method is the main topic of discussion and its use and/or limitations for reservoir and well evaluation. Several field examples are used to illustrate the presented methods. As a main result it is concluded that pressure data acquisition using acoustic methods is the best alternative for pumping wells. The pressure data resolution and accuracy is pressure data resolution and accuracy is similar to a conventional amerada type of gauge. However the main advantage is that we can get the whole pressure transient profile (flowing/buildup) in real time if necessary. This definitely provides an enhanced data interpretation that can be used for reservoir evaluation specially for secondary recovery projects. projects Introduction Formation evaluation using pressure transient analysis is a well known technology applicable to both exploratory as well as production or active wells. Recent advances in the theoretical principles for the analysis of pressure transient principles for the analysis of pressure transient data and in the resolution of pressure gauges permits a resolutive reservoir description for permits a resolutive reservoir description for the drainage area of the well tested. A good summary of the advances in practical well test analysis has been recently presented by Ramey. Much of the advances have been obtained during the eighties: Use of the derivative as a diagnostic tool, regression analysis techniques for data evaluation are just a few. Nevertheless and in spite of the recent advances there are many cases where a given analysis is subject to uncertainties and spec. It seems that both the reservoir model used to match the data and the particular well production system are factors that sometimes limit the acquisition and analysis of data. A good example of this are pumping wells. It is worth to mention here that there are many secondary recovery projects where production comes from pumping wells. Pressure production comes from pumping wells. Pressure monitoring using conventional amerada gauges is not quite accepted due to uncertainties in the measured wellbore flowing pressure just before shut-in. In many cases because of the lack of data during the early time region of the buildup period. P. 19

Reservoir Testing Analysis in the Presence of Water Drive by Surge Technique

Sierra

SPE Latin America Petroleum Engineering Conference

1992

In this work a testing technique based on analysis of the pressure transient created by formation surging is presented. The application of the technique is focused to cases where the tested well has high water cut besides strong bottom hole water drive and partial penetration. The analysis of the flow regimes shown under these conditions is presented. Several field cases are shown in order to see the application of this technique. A major result derived from this study is that the technique can be succesfully used in cases where by conventional pressure transient analysis no resevoir parameters can be obtained mainly because no radial flow is shown due to constant pressure effects. Linear, Radial, Bilinear and Spherical flow can be identified. Therefore making possible the calculation of transmissibily and skin effects.