Reservoir Evaluation Using Interval Pressure Transient Test in Appraisal Gas Wells, Offshore Trinidad and Tobago

2014 ◽  
Author(s):  
Davoud Bardal ◽  
Melanie Sabrina Trim ◽  
Reynaldo Tapia ◽  
Jose Abraham Arias-Correa ◽  
Sasha M. Baptista-Parra
Keyword(s):  
Trinidad And Tobago ◽  
Gas Wells ◽  
Pressure Transient ◽  
Reservoir Evaluation ◽  
Pressure Transient Test

Reservoir Evaluation Using Interval Pressure Transient Test in Appraisal Gas Wells, Offshore Trinidad and Tobago

2014 ◽  
Author(s):  
D.. Bardal ◽  
M. S. Trim ◽  
R.. Tapia ◽  
J.A.. A. Arias-Correa ◽  
S.M.. M. Baptista-Parra
Keyword(s):  
Trinidad And Tobago ◽  
Hydrocarbon Exploration ◽  
Gas Wells ◽  
Pressure Transient ◽  
Reservoir Evaluation ◽  
Fluid Properties ◽  
Fluid Characterization ◽  
Petrophysical Logs ◽  
Pressure Transient Test ◽  
Access To Data

Abstract Hydrocarbon exploration is a challenging, costly and high-risk investment and success often requires further drilling of one or more appraisal wells to acquire data of the highest quality for reservoir evaluation and characterization before development plans can be put in place. During the exploration and appraisal stages it is important to define the reservoir fluid properties and reservoir parameters to enable accurate economic assessments. Three appraisal wells in two gas fields offshore Trinidad and Tobago were drilled in reservoir formations that are mainly unconsolidated sandstones with dry, biogenic gas. An extensive wireline logging program was planned which ranged from basic and advanced petrophysical logs to images and formation testers including the dual-packer module to perform interval pressure transient tests (IPTT) or ‘Mini-DSTs’ as these are also known. This was the first time in Trinidad and Tobago that IPTTs were conducted on appraisal gas wells. Technical factors influencing the decision to use an IPTT as opposed to a full Drill Stem Test (DST) included access to data from existing full DST's acquired in a nearby offset wells and a specific need to target thin-bedded and laminated sands so as to evaluate them individually and to observe vertical interference or connectivity between sand units. A combination of IPTT analysis and real-time downhole fluid characterization was applied to the appraisal wells which resulted in an improved understanding of the reservoir. The IPTT planning, methodology and applications, along with insights on some of the challenges encountered during operations which included changes to drilling operations in order to achieve the planned formation evaluation are presented.

Diagnostic Plots of Pressure Transient, Rate-Transient, and Diagnostic Fracture-Injection/Falloff Tests

2021 ◽  
Author(s):  
David Craig ◽  
Thomas Blasingame
Keyword(s):  
Flow Regimes ◽  
Horizontal Stress ◽  
Test Theory ◽  
Pressure Transient ◽  
Diagnostic Plots ◽  
Diagnostic Plot ◽  
New Ideas ◽  
Characteristic Features ◽  
Pressure Transient Test ◽  
Minimum Horizontal Stress

Abstract All transient test interpretation methods rely on or utilize diagnostic plots for the identification of wellbore or fracture storage distortion, flow regimes, and other parameters (e.g., minimum horizontal stress). Although all "test" interpretations of interest are transient test data (i.e., those involving an "event"), the associated diagnostic plots are not interchangeable between such tests. The objective of this work is to clearly define the appropriate diagnostic plot(s) for each type of transient test. The work applies the appropriate transient test theory to demonstrate the applicability of each diagnostic plot along with clearly defining the characteristic features that make a given plot "diagnostic." For pressure transient testing, the material is largely a review, but for rate transient tests and diagnostic fracture-injection/falloff tests, new ideas are introduced and documented to justify appropriate diagnostic plots. Data examples are provided for illustration and application. In general, pressure transient test diagnostic plots are not misused, but the same cannot be said for diagnostic fracture-injection/falloff tests (or DFITs) where it is common to ascribe flow regimes and/or draw other erroneous conclusions based on observations from an inappropriately constructed or interpretated diagnostic plot. The examples provided illustrate both the correct diagnostic plot and interpretations, but also illustrate how data can be easily misinterpreted in common practice.

A New Approach for Wireline Formation Testers (WFT) Interval Pressure Transient Test Design

2012 ◽  
Author(s):  
Prasanna Kumar Tellapaneni ◽  
Sourabh Shukla ◽  
Richard Robert Jackson ◽  
James Dunlap ◽  
Harshad Dixit
Keyword(s):  
Test Design ◽  
New Approach ◽  
Pressure Transient ◽  
Pressure Transient Test

Use of Wellhead Data for Pressure Transient Analysis for HPHT Gas Wells

2015 ◽  
Author(s):  
Akim Kabir ◽  
Sebastian L. Saavedra ◽  
Abdullah Utaibi ◽  
Mustafa Basri
Keyword(s):  
Transient Analysis ◽  
Gas Wells ◽  
Pressure Transient Analysis ◽  
Pressure Transient
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