Productivity Enhancement of Horizontal Heavy Oil Wells in the South of Oman

Zreik, Bassam; Al-Hattali, Ahmed Salim; Al-Busaidi, Khalfan Hamoud; Bushara, Mohamed N.; Tripathy, Surendra Kumar

doi:10.2118/120487-ms

Cited by 2 publications

(1 citation statement)

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“…According to the law of equivalent percolation resistance, the productivity of horizontal well is (13) Analysis of horizontal well flowing characteristics by primary recovery Solving above equations, under primary recovery condition, when displacement pressure gradient equals to the startup pressure, the correlation of utmost producing radius and production pressure was studied. The layouts of ultimate drainage radius under different production pressure in regions with different mobility were built up (Shown in Figure 5).…”

Section: Seepage Model In Yz Vertical Planementioning

confidence: 99%

Primary Recovery and Thermal Recovery Conditions and Producing Limits for the Low-permeability Porous Carbonate Heavy Oil Reservoir

Liu

Cao

et al. 2015

SPE Middle East Oil &Amp; Gas Show and Conference

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Syrian OD oilfield is of low-permeability massive block porous carbonate heavy oil reservoir. Most of oil wells are deployed on the top of the reservoir with relative high mobility mainly on primary recovery. Currently, the producing degree of reserves is as low as 37%. The technical and economic conditions and limits are uncertain for 1P reserves. Effective oilfield development strategies are required to be optimized as well.Relying on the flowing characteristics, by analytical method and numerical simulation, considering economic limits, the technical and economic conditions and limits for vertical, horizontal wells are determined on primary and thermal recovery. Meanwhile, the reasonable development methods and well pattern, well spacing are optimized for different blocks and layers, development strategies are optimized.The correlation of drainage radius of vertical and horizontal well on primary recovery with producing pressure and mobility are analyzed. Utmost drainage radiuses of horizontal wells are determined on different pressure drawdown on primary recovery. For thermal recovery, the utmost drainage radius is determined based on the variable temperature distribution profile, variable start-up pressure gradient distribution pattern is unveiled. Considering economic initial oil rate limit and cumulative production, pressure drawdown condition is set up for primary and thermal recovery. Then mobility limits are determined hereby. Thus, mobility limit, net pay limit and minimum economic drainage radius are set as well. It is considered that some blocks can effectively developed by primary recovery in current well pattern with mobility above 0.5mD/cp, some blocks should be developed by infilling wells on thermal recovery in 'Triangle Well Pattern' to improve the reserves producing degree as well as RF.As applying the technique, 1P OOIP producing degree can be improved from 37% to 89.7% and recovery factor will be improved from 4.5% to 9.8%, OD oilfield keeps oil production rising as well.

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Section: Seepage Model In Yz Vertical Planementioning

confidence: 99%

Primary Recovery and Thermal Recovery Conditions and Producing Limits for the Low-permeability Porous Carbonate Heavy Oil Reservoir

Liu

Cao

et al. 2015

SPE Middle East Oil &Amp; Gas Show and Conference

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Facies Based Approach to Amin Reservoir Characterization In A Heavy Oil Field In The South Of Oman

Lukmanov¹

2012

All Days

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The field X is a brown heavy oil field producing under strong bottom water drive since the mid-1980. Production is from a combination of Amin aeolian and Al Khlata glacial reservoir sediments. At present, the development is focused on drilling horizontal infill wells. One of the biggest challenges is the unfavorable mobility contrast between the heavy oil and water causing early water breakthrough.The Amin Formation, the primary reservoir, is characterized by a high net to gross ratio and an average porosity of 30 %. However the initial hydrocarbon saturation at the same porosity often varies by 20 % in different parts of the field. Furthermore, core measurements show an order of magnitude scatter in permeability at the same porosity, indicating the presence of different facies. In early studies these variations were attributed mainly to the grain size variations. A later petrographical study found that the abundance of clays and feldspars could also severely reduce permeability, but may retain high porosity.In the current Study it was found that the rocks have variable radioactivity due to the presence of radioactive Potassium isotope associated with feldspars. A fare correlation was observed between the grain size and the content of feldspars from core. A novel approach to reservoir characterization integrating core and logs was developed leading to a major breakthrough in the reservoir characterization including: Enhanced permeability prediction using normalized Gamma Ray (GR) log as 3rd parameter;  Facies identification using normalized Gamma Ray cut-off;  Facies based Saturation-Height models.This work is a good example of advances in reservoir characterization achieved by integrating core and log data. It results in better understanding of reservoir properties distribution, optimization of completions of new wells and improvement of further development scenarios. In particular, abnormally high gross production and high water cut in the north of the field is currently in line with new facies scheme.

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Productivity Enhancement of Horizontal Heavy Oil Wells in the South of Oman

Cited by 2 publications

References 0 publications

Primary Recovery and Thermal Recovery Conditions and Producing Limits for the Low-permeability Porous Carbonate Heavy Oil Reservoir

Primary Recovery and Thermal Recovery Conditions and Producing Limits for the Low-permeability Porous Carbonate Heavy Oil Reservoir

Facies Based Approach to Amin Reservoir Characterization In A Heavy Oil Field In The South Of Oman

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