Transient Analysis of Tight Gas Well Performance - More Case Histories

2003 ◽  
Author(s):  
Jorge A. Arevalo-Villagran ◽  
Heber Cinco-Ley ◽  
Robert. A. Wattenbarger ◽  
Francisco Garcia-Hernandez ◽  
Fernando Samaniego-Verduzco
Keyword(s):  
Transient Analysis ◽  
Tight Gas ◽  
Well Performance ◽  
Case Histories ◽  
Gas Well

The Use of Rate-Transient-Analysis Modeling To Quantify Uncertainties in Commingled Tight Gas Production-Forecasting and Decline-Analysis Parameters in the Alberta Deep Basin

2014 ◽  
Vol 17 (02) ◽  
pp. 209-219 ◽  
Author(s):  
H.. Luo ◽  
G.F.. F. Mahiya ◽  
S.. Pannett ◽  
P.. Benham
Keyword(s):  
Transient Analysis ◽  
Early Time ◽  
Gas Production ◽  
Tight Gas ◽  
Well Performance ◽  
Deep Basin ◽  
Type Curves ◽  
Production Forecasting ◽  
Rate Transient Analysis ◽  
Production History

Summary The evaluation of expected ultimate recovery (EUR) for tight gas wells has generally relied upon the Arps equation for decline-curve analysis (DCA) as a popular approach. However, it is typical in tight gas reservoirs to have limited production history that has yet to reach boundary-dominated flow because of the low permeability of such systems. Commingled production makes the situation even more complicated with multiboundary behavior. When suitable analogs are not available, rate-transient analysis (RTA) can play an important role to justify DCA assumptions for production forecasting. The Deep-basin East field has been developed with hydraulically fractured vertical wells through commingled production from multiple formations since 2002. To evaluate potential of this field, DCA type curves for various areas were established according to well performance and geological trending. Multiple-segment DCA methodology demonstrated reasonable forecasts, in which one Arps equation is used to describe the rapidly decreasing transient period in early time and another equation is used for boundary-dominated flow. However, a limitation of this approach is the uncertainty of the forecast in the absence of extended production data because the EUR can be sensitive to adjustments in some assumed DCA parameters of the second segment. In this paper, we used RTA to assess reservoir and fracture properties in multiple layers and built RTA-type well models around which uncertainty analyses were performed. The distributions of the model properties were then used in Monte Carlo analysis to forecast production and define uncertainty ranges for EUR and DCA parameters. The resulting forecasts and EUR distribution from RTA modeling generally support the DCA assumptions used for the type curves for corresponding areas of the field. The study also showed how the contribution from the various commingled layers changes with time. The proposed workflow provides a fit-for-purpose way to quantify uncertainties in tight gas production forecasting, especially for cases when production history is limited and field-level numerical simulation is not practicable.

A Semianalytical Methodology To Diagnose the Locations of Underperforming Hydraulic Fractures Through Pressure-Transient Analysis in Tight Gas Reservoir

SPE Journal ◽  
2016 ◽  
Vol 22 (03) ◽  
pp. 924-939 ◽  
Author(s):  
Youwei He ◽  
Shiqing Cheng ◽  
Shuang Li ◽  
Yao Huang ◽  
Jiazheng Qin ◽  
...  
Keyword(s):  
Production Rate ◽  
Transient Analysis ◽  
Gas Production ◽  
Hydraulic Fractures ◽  
Tight Gas ◽  
Well Performance ◽  
Gas Reservoir ◽  
Pressure Transient ◽  
Type Curves ◽  
Tight Gas Reservoir

Summary The increasing activities in tight reservoir exploitation through fractured wells have attracted interests of pressure-transient analysis (PTA) for well-performance evaluation. The production rates of different fractures were assumed to be equal in previous models. However, different fractures have unequal contributions to the total-gas-production rate because of the differences of fracture scale (e.g., half-length, height), heterogeneity of gas saturation, formation damage, and fracture closure. This paper considers the effect of unequal gas-production rate of each fracture (UGPREF) on pressure-transient behaviors, and develops a semianalytical methodology to diagnose the specific locations of underperforming fractures through PTA by use of bottomhole-pressure (BHP) data. First, new semianalytical solutions of a multifractured horizontal well (MFHW) in a tight gas reservoir are derived on the basis of the Green function (Gringarten and Ramey 1973) and Newman product method (Newman 1936). Second, the model is validated by comparison with the numerical model in KAPPA Ecrin (Saphir) software (Essca 2011). Third, type curves are developed, and sensitivity analysis is further investigated. Results show that there exist clear distinctions among these type curves between equal gas-production rate of each fracture (EGPREF) and UGPREF. The early radial flow is distinguishable and behaves as a horizontal line with the value of 0.5/N* (N* = N for EGPREF, N*≠N for UGPREF) in the pseudopressure-derivative curves when the interferences between fractures do not overlap this period. If the early-radial flow was mistakenly regarded as pseudoradial flow, the interpreted permeability would be N* times smaller than the accurate result. Furthermore, the methodology is applied to a field case of the Daniudi tight gas reservoir in the Ordos Basin, which illustrates its physical consistency and practicability to diagnose the specific locations of underperforming hydraulic fractures through pressure-history matching. It also provides feasible references for reservoir engineers in well-performance evaluation and field strategy (e.g., refracturing, acidizing, or other stimulation treatments) to enhance hydrocarbon production.

MIcroseismic Leads to Improved Understanding of Hydraulic Fracturing in a Sultanate of Oman Tight Gas Well

2013 ◽  
Author(s):  
Alasdair MacKenzie ◽  
Robert Alfred Clark ◽  
Abdullah Al Anboori
Keyword(s):  
Hydraulic Fracturing ◽  
Tight Gas ◽  
Sultanate Of Oman ◽  
Gas Well

scholarly journals Investigate a Gas Well Performance Using Nodal Analysis

2017 ◽  
Vol 217 ◽  
pp. 012022
Author(s):  
Hisham Ben Mahmud ◽  
Aman Abdullah
Keyword(s):  
Well Performance ◽  
Gas Well ◽  
Nodal Analysis

Simplified approach for predicting gas well performance

2009 ◽  
Vol 65 (1-2) ◽  
pp. 51-61 ◽  
Author(s):  
Hazim Al-Attar ◽  
Sulaiman Al-Zuhair
Keyword(s):  
Well Performance ◽  
Gas Well ◽  
Simplified Approach

Drainage Shape and Size of a Vertically-Fractured Tight-Gas Well

2001 ◽  
Author(s):  
Guillermo A. Alzate ◽  
Her-Yuan Chen ◽  
Lawrence W. Teufel
Keyword(s):  
Tight Gas ◽  
Gas Well ◽  
Shape And Size

Integrating Pressure Transient and Rate Transient Analysis for EUR Estimation in Tight Gas Volcanic Reservoirs

2017 ◽  
Author(s):  
A. Beohar ◽  
S. K. Verma ◽  
V. Sabharwal ◽  
R. Kumar ◽  
P. Shankar ◽  
...  
Keyword(s):  
Transient Analysis ◽  
Tight Gas ◽  
Pressure Transient ◽  
Rate Transient Analysis ◽  
Volcanic Reservoirs
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