Application of a New Mechanistic Decline Curve Method to Kern County Oil Fields

Reyes, Jericho L. P.; Li, Kewen; Horne, Roland N.

doi:10.2118/90212-ms

Cited by 5 publications

(2 citation statements)

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“…Li and Horne [6] revealed a linear relationship between the oil production rate and oil recovery percent based on previous experimental data from core samples [7,8]. Later Reyes et al [9] draw the same conclusions according actual production data from six Kern County oil fields. The main purpose of this paper is to investigate the linear relationship between recovery percent and oil production rate.…”

Section: Introductionmentioning

confidence: 73%

A New Method of Calculating Recovery of Waterflooding Reservoir by Using Production Rate

Zhao

Zhang

et al. 2013

AMR

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Development characteristics of oil field during production-decreasing stage were analyzed in this paper. The ultimate recovery factor can be determined at a limit of oil production rate by investigating the relationship between production rate and recovery percent. Some physical conditions were given. Based on the mass conservation principal and seepage mechanics method, it was found that the recovery degree varies versus production rate linearly. The model prediction using the actual data of west Ng63+4oil strata in Gudong 7 region, a reservoir in Shengli oilfield of China, was performed. The results demonstrated that the linear model had well estimation of the recoverable recovery of oil fields which were at the later period of high water cut stage.

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Section: Introductionmentioning

confidence: 73%

A New Method of Calculating Recovery of Waterflooding Reservoir by Using Production Rate

Zhao

Zhang

et al. 2013

AMR

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“…Li и Horne (2005) выдвигали модель регрессивной диаграммы с теоретическим основанием (Li и Horne, 2001. И многие сотрудники широко применяют его на практике (Høgnesen et al, 2004;Arihara, 2004, Reyes et al, 2004Cunningham и Lecompte, 2005;Lawal, et al, 2008). Однако модель Li-Horne пока еще не применяется в нефтяных пластах типа естественных брешей и карстов диаметром более 5m.…”

Section: резюмеunclassified

Oil Production and Water-Cut in Naturally-Fractured and Vuggy Reservoirs (Russian)

Li¹,

Lin²,

Li³

et al. 2008

SPE Russian Oil and Gas Technical Conference and Exhibition

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Авторское право 2008 г., Общество инженеров-нефтяников Этот доклад был приготавливан предьявления в 2008 Российской нефтьегазовой технической конференции и выставке состоится в Москве 28-30 октабря 2008.Данный доклад был выбран для проведения презентации Программным комитетом SPE по результатам экспертизы информации, содержащейся в представленном авторами резюме. Экспертиза содержания доклада Обществом инженеров-нефтяников не выполнялась, и доклад подлежит внесению исправлений и корректировок авторами. Материал в том виде, в котором он представлен, не обязательно отражает точку зрения Общества инженеров-нефтяников, его должностных лиц или участников. Доклады, представленные на конференциях SPE, подлежат экспертизе со стороны Редакционных Комитетов Общества инженеров-нефтяников. Электронное копирование, распространение или хранение любой части данного доклада в коммерческих целях без предварительного письменного согласия Общества инженеров-нефтяников запрещается. Разрешение на воспроизведение в печатном виде распространяется только на резюме длиной не более 300 слов; при этом копировать иллюстрации не разрешается. Резюме должно содержать явно выраженную ссылку на то, где и кем был представлен данный доклад. Write Librarian, SPE, P.O.Box 833836, Richardson, TX 75083-3836 U.S.A., факс 01-972-952-9435.

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Oil Production and Water-Cut in Naturally-Fractured Vuggy Reservoirs

Lin

2008

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Naturally fractured oil reservoirs with vugs of size over 5 meters in diameter are few in the world. We developed a method to correlate the decrease in oil production and the increase in water cut. Production data from Tah oil reservoir (China) with big size vugs and high-density fractures were used to test the approach. It was found that the oil production decline and the water cut increase were coupled closely in many wells from this naturally fractured vuggy oil reservoir. The oil production was characteristic of rapid decline and the water cut was characteristic of sharp increase right after water breakthrough in many oil wells. An idea of shutting off water before water enters the production zone was proposed to reduce the decline rate of oil production and the increase in water cut. This approach of water shut off has many advantages compared to the routine measures which are usually taken after water cut is already great. Introduction A large amount of the world's hydrocarbon reserves are in carbonate reservoirs with natural fractures and vugs. These carbonate reservoirs are more challenging for estimating the petrophysical properties and understanding the fluid flow mechanisms as well as the production performance, compared to most sandstone reservoirs (Hurley, et al., 1998). This may be because the rock in carbonate reservoirs contains not only matrix and fractures but also different size of vugs. Although there have been many reports on decline curve analysis (Arps, 1945; Fetkovich, 1971 and 1980; Agbi and Ng, 1987;Camacho and Raghavan, 1989; Palacio and Blasingame, 1993; Masoner, 1998; Agarwal, et al., 1999; Marhaendrajana and Blasingame, 2001), papers on naturally fractured reservoirs with big vugs of diameter ranging from about one centimeter to over 5 meters have been few. Li and Horne (2005) proposed a mechanistic decline model based on previous theoretical and experimental studies (Li and Horne, 2001, 2004). This model has been used in different cases by many researchers (Høgnesen et al., 2004; Arihara, 2004, Reyes et al., 2004; Cunningham and Lecompte, 2005; Lawal, et al., 2008). However the Li-Horne model has not been applied to an oil reservoir with big vugs of diameter over 5 meters. It is important and critical to accurately predict the water cut for many aspects of reservoir engineering. The traditional aspects include reserves estimation, reservoir surveillance and management; the more modern aspect includes the need to comply with increasingly stringent regulatory requirements for the disposal of produced water. In many cases, decline of oil production is associated with increase in water cut. There are several models in the literature dedicated to fitting water cut trends during oil decline. As pointed out by Lawal, et al. (2008), these correlations can be divided into three main classes:using fractional flow theory, in which relative permeability functions are approximated, to establish water cut (or water-oil ratio) variation with oil recovery (Ershaghi and Omoregie, 1978; Lo et al., 1990; Sitorus et al., 2006);using the Arps model and its modifications, for example, semi-log water cut versus oil recovery, andobserved trends, for example, linear water cut versus oil recovery. While these methods have been applied extensively, none has been found to be sufficiently robust. In this study, we proposed a method to correlate the decrease in oil production rate and the increase in water cut in one graph. Production data from Tah oil reservoir (China) with large vugs and high-density fractures were used to test the approach.

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Application of a New Mechanistic Decline Curve Method to Kern County Oil Fields

Cited by 5 publications

References 39 publications

A New Method of Calculating Recovery of Waterflooding Reservoir by Using Production Rate

A New Method of Calculating Recovery of Waterflooding Reservoir by Using Production Rate

Oil Production and Water-Cut in Naturally-Fractured and Vuggy Reservoirs (Russian)

Oil Production and Water-Cut in Naturally-Fractured Vuggy Reservoirs

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