An Optimum Method of Early-Time Well Test Analysis -- Genetic Algorithm

1998 ◽  
Author(s):  
Hongjun Yin ◽  
Yunfang Zhai
Keyword(s):  
Genetic Algorithm ◽  
Early Time ◽  
Well Test ◽  
Well Test Analysis ◽  
Test Analysis

Well Test Analysis for Wells Producing Layered Reservoirs With Crossflow

1985 ◽  
Vol 25 (03) ◽  
pp. 380-396 ◽  
Author(s):  
R. Prijambodo ◽  
R. Raghavan ◽  
A.C. Reynolds
Keyword(s):  
Single Layer ◽  
Early Time ◽  
Test Period ◽  
Transitional Period ◽  
Well Test ◽  
Layer System ◽  
Well Test Analysis ◽  
Test Analysis ◽  
Pressure Buildup ◽  
Short Time

Well Test Analysis for Wells Producing Layered Reservoirs Producing Layered Reservoirs With Crossflow Abstract The pressure response of a well producing a two-layer reservoir with crossflow is examined. Virtually all studieson the response of a well in multilayered systems with crossflow claim that after a few hours of production theses ystems behave as if they are single-layer systems. A careful examination of the early-time performance of a well in a reservoir with crossflow indicates that its behavior is remarkably different from that of an equivalent single-layer system and is influenced significantly by the degree of communication. It is important to understand short-time behavior, since the time span of virtually allpressure buildup tests encompasses the duration in which pressure buildup tests encompasses the duration in which a layered reservoir with crossflow may not behave as ifit were a single-layer system. Thus, interpretations of pressure buildup data based on single-layer theory can be pressure buildup data based on single-layer theory can be erroneous. In this study, we show that the flowing pressure response of a well at early times can be divided into threeflow periods. The first period is one in which the reservoir behaves as if it were a stratified (no-crossflow)system. This period is followed by a transitional period. The response of the well during this period depends onthe contrast in horizontal permeabilities and on the degreeof communication between the layers. During the third period, the reservoir can he described by an equivalent period, the reservoir can he described by an equivalent single-layer system. An examination of the time ranges of the various flowperiods indicates that, unless tests are designed periods indicates that, unless tests are designed properly, most of the interpretable pressure buildup data would properly, most of the interpretable pressure buildup data would be measured during the time the well response is influenced by the transitional period. The influence of the skin regions on the well responseis examined. The significance of the estimate of the skin factor obtained from a pressure test is discussed. We showthat the nature and the magnitude of the skin regions andthe size of the reservoir determine the applicability of conventional semilog procedures to systems with interlayer communication. Introduction The economic consequences of interlayer crossflow arewell established in the literature. Several studies have examined the well response in a reservoir with interlayer communication. However, most of these studies have been concerned primarily with the long-term performance of the well. A reservoir with crossflow can be representedby a single-layer reservoir of equal volume if the flow capacity of the single-layer system is equal to the arithmetic sum of the flow capacities of all layers. Some of these studies also have shown that the early-time response of a well draining a reservoir with interlayer crossflow is similar to the response of a well in a stratified(no-crossflow, commingled) reservoir. Undoubtedly, a transitional period must exist between these two extremes. None of the works cited previously discuss the duration of or the characteristics of the transitional period. If oneis interested in short-time testing, such as pressure builduptests, then it is imperative that the duration of the transitional period and the characteristics of the well responseduring this period be known. For example, if the duration of the test period is such that the well behaves as ifit drains a stratified system or a homogeneous system, then classical well test theories should be applicable. On the other hand, if the test period is such that the transitional period governs the well response, then important questions need to be answered. First, what are the magnitudes of the errors that would result if data during this period are analyzed by conventional procedures? Second, what are the parameters that control the duration of the transitional flow period? Third, is it possibleto obtain reservoir characteristics from a pressure buil duptest? None of the studies in the literature considers the influence of the skin regions on the well response. The skin regions have a significant influence on interlayer crossflow. In this study we show that the skin regions can havea dramatic influence on the well response, particularly during early times. We also show that conventional interpretations of flow behavior in the skin region are inadequate if the layers are in communication. The objective of this paper is to present a thorough examination of the performance of a well in a reservoir with intelayer crossflow. We intend to address the questions raised in the preceding paragraphs. The determination of formation parameters will be discussed. The results obtained here are applicable to both pressure transient testsand production logging. SPEJ P. 380

Connecting Data, Model and Process to Streamline and Enhance Single-Point Production Well Test Validation

2021 ◽  
Author(s):  
Mohamad Mustaqim Mokhlis ◽  
Nurdini Alya Hazali ◽  
Muhammad Firdaus Hassan ◽  
Mohd Hafiz Hashim ◽  
Afzan Nizam Jamaludin ◽  
...  
Keyword(s):  
Test Data ◽  
Single Point ◽  
Database Systems ◽  
Test Validation ◽  
Well Test ◽  
Production Well ◽  
Well Test Analysis ◽  
Test Analysis ◽  
Digital Ecosystem ◽  
Well Model

Abstract In this paper we will present a process streamlined for well-test validation that involves data integration between different database systems, incorporated with well models, and how the process can leverage real-time data to present a full scope of well-test analysis to enhance the capability for assessing well-test performance. The workflow process demonstrates an intuitive and effective way for analyzing and validating a production well test via an interactive digital visualization. This approach has elevated the quality and integrity of the well-test data, as well as improved the process cycle efficiency that complements the field surveillance engineers to keep track of well-test compliance guidelines through efficient well-test tracking in the digital interface. The workflow process involves five primary steps, which all are conducted via a digital platform: Well Test Compliance: Planning and executing the well test Data management and integration Well Test Analysis and Validation: Verification of the well test through historical trending, stability period checks, and well model analysis Model validation: Correcting the well test and calibrating the well model before finalizing the validity of the well test Well Test Re-testing: Submitting the rejected well test for retesting and final step Integrating with corporate database system for production allocation This business process brings improvement to the quality of the well test, which subsequently lifts the petroleum engineers’ confidence level to analyze well performance and deliver accurate well-production forecasting. A well-test validation workflow in a digital ecosystem helps to streamline the flow of data and system integration, as well as the way engineers assess and validate well-test data, which results in minimizing errors and increases overall work efficiency.

Multi-Phase Flow Well Test Analysis in Multi-Layer Reservoirs

1996 ◽  
Author(s):  
W. Jatmiko ◽  
T.S. Daltaban ◽  
J.S. Archer
Keyword(s):  
Phase Flow ◽  
Well Test ◽  
Well Test Analysis ◽  
Test Analysis ◽  
Multi Phase Flow ◽  
Multi Phase

scholarly journals WELL TEST ANALYSIS AND INTERPRETATION: THE USE OF ARTIFICIAL NEURAL NETWORK

2020 ◽  
Vol 04 (11) ◽  
pp. 438-446
Author(s):  
Samuel Lucky Arubi ◽  
Bibobra Ikporo ◽  
Sunday Igbani ◽  
Ann Obuebute ◽  
Sylvester Okotie
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Well Test ◽  
Well Test Analysis ◽  
Test Analysis ◽  
Artificial Neural
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