Application of rate transient analysis modeling in diagnosis of well abnormal flowing status in Middle East carbonate reservoir

Kaijun Tong; BingFu Luo; Kaiser A. Jasim; Dongping Zhang; Ashraf Ali Taha; Han Chen; Ali Ghazi; Abbas Radhi

doi:10.5897/JPGE2019.0332

Journal of
Petroleum and Gas Engineering

Abbreviation: J. Petroleum Gas Eng.
Language: English
ISSN: 2141-2677
DOI: 10.5897/JPGE
Start Year: 2010
Published Articles: 123

Full Length Research Paper

Application of rate transient analysis modeling in diagnosis of well abnormal flowing status in Middle East carbonate reservoir

Kaijun Tong

Kaijun Tong
CNOOC International Limited, Beijing 300452, China.
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BingFu Luo

BingFu Luo
CNOOC International Limited, Beijing 300452, China.
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Kaiser A. Jasim

Kaiser A. Jasim
Missan Oil Company, Amara 61001, Iraq.
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Dongping Zhang

Dongping Zhang
CNOOC International Limited, Beijing 300452, China.
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Ashraf Ali Taha

Ashraf Ali Taha
CNOOC International Limited, Beijing 300452, China.
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Han Chen

Han Chen
CNOOC International Limited, Beijing 300452, China.
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Ali Ghazi

Ali Ghazi
Missan Oil Company, Amara 61001, Iraq.
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Abbas Radhi

Abbas Radhi
Missan Oil Company, Amara 61001, Iraq.
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Article Number - 504D71362919
Vol.11(1), pp. 9-18 , January 2020
https://doi.org/10.5897/JPGE2019.0332

Received: 07 November 2019
Accepted: 23 January 2020
Published: 29 February 2020

Abstract

Modern Rate Transient Analysis (RTA) is the hottest technology in recent years in reservoir engineering. Its main working principle is combining production data with bottom-hole pressure data based on the assuming reservoir model and well model. It will evaluate the reserves (Oil Drainage Radius and STOIIP), reservoir properties (permeability), wellbore condition (skin) and forecast production performance for single well based on matching Blasingame and Log-Log type-curve. The RTA was found to be extremely powerful and popular particularly with high resolution to obtain equivalent results with PTA rather than limited shutting well. With benefit of continued monitoring of production and FBHP or FWHP, it is possible to evaluate the wells’ interference and boundary in distance besides conventional reservoir properties. In this paper, taking a carbonate reservoir in the Middle East as an example, this technology was applied to diagnose and analyze the abnormal production of pilot horizontal wells. Based on the analysis results, combining with the understanding of geological study, material balance analysis, numerical simulation and adjacent vertical well’s performance, it is clear that the distribution of mudstone interlayer and reservoir poor connectivity in member-A are the main interior factors of the abnormal production of pilot horizontal wells. According to the research, this paper put forwards optimization of development strategy for subsequent producing subzones, well location and well type of new well in interest area.

Key words: Rate transient analysis, type-curve, reservoir properties, carbonate reservoir, Middle East

Abbreviation

h = net-pay, ft; Φ = porosity, %; k = reservoir permeability, md; P_i = initial reservoir pressure, psi; P_wf = flowing bottom-hole pressure, MPa; q(t) = liquid rate, bbl/d; Q(t) = cumulative liquid rate, bbls; r_w = well bore radius, m; R_e = drainage radius, m; S_o = oil saturation; t = time; t_cr = material balance time; µ = viscosity, cp; B = formation volume factor, bbl/STB; C_t = total reservoir compressibility, 1/MPa; S = Skin; STOIIP = reserves in drainage area, MMSTB.