Feasibility of the Gas and Downhole Water Sink-Assisted Gravity Drainage (GDWS-AGD) Process to Enhance the Recovery of Oil in Reservoirs with Strong Aquifer

Al‐Mudhafar, Watheq J.; Al-Obaidi, Dahlia A.; Saini, Dayanand; Wojtanowicz, Andrew K.; Al-Jawad, Mohammed S.

doi:10.1007/978-981-33-6133-1_7

Cited by 3 publications

(1 citation statement)

References 12 publications

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“…Combining SIP results with other well information (such as initial reservoir pressure and total well production) allows the allocation of production to individual zones. The influence on uncertainty of PL interpretation may be due to the probable existence of water drive and production from offset wells therefore it must be considered when assessing the reliability of results obtained through application of the technique [18,19,20]. The most important advantage of SIP method is to minimize cost and time during the operational sequence.…”

Section: Fig 8 Well-2 Completionsmentioning

confidence: 99%

Identifying Average Reservoir Pressure in Multilayered Oil Wells Using Selective Inflow Performance (SIP) Method

Tarq,

Al-Obaidi

2023

IJCPE

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The downhole flow profiles of the wells with single production tubes and mixed flow from more than one layer can be complicated, making it challenging to obtain the average pressure of each layer independently. Production log data can be used to monitor the impacts of pressure depletion over time and to determine average pressure with the use of Selective Inflow Performance (SIP). The SIP technique provides a method of determining the steady state of inflow relationship for each individual layer. The well flows at different stabilized surface rates, and for each rate, a production log is run throughout the producing interval to record both downhole flow rates and flowing pressure. PVT data can be used to convert measured in-situ rates to surface conditions. Different types of Inflow Performance Relationship (IPR) equations can be used for SIP interpretation, including the Straight-line method, Fetkovitch method, and Laminar Internal Turbulent (LIT) relations. Although the SIP method can be used for single-phase flow, the interpreter can restrict the IPR’s calculations to a particular phase. This research discusses the difficulties in estimating the average reservoir pressure in multilayered reservoir completed wells over their production life. The SIP technique has been applied to some producing wells in the south of Iraq, which are completed in multiple producing reservoirs previously tested with a formation tester to estimate reservoir pressure and other parameters. Two wells are taken in the south of Iraq region, Zubair Oil Field, one with cross flow between perforations and the other well with no cross flow. An average pressure is not calculated for layer A in Well-1, because there is no contribution rate. While the average pressure for Well-1, layer B is 3414.49 psia. Also, the average pressure for Well-2, layer H is not calculated because there is no rate contribution from this layer, and the maximum average pressure was calculated in layer G, which is about 2606.26 psia. It is also found that the presence of cross flow has no effect on SIP calculations.

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Section: Fig 8 Well-2 Completionsmentioning

confidence: 99%

Identifying Average Reservoir Pressure in Multilayered Oil Wells Using Selective Inflow Performance (SIP) Method

Tarq,

Al-Obaidi

2023

IJCPE

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Development of a Multi-Completion Gas and Downhole Water Sink-Assisted Gravity Drainage (MC-DWS-AGD) to Improve Oil Recovery and Reduce Water Cut in Reservoirs with Strong Water Aquifers

Al-Obaidi

Wood

Al‐Mudhafar³

et al. 2023

Day 2 Tue, April 18, 2023

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Gas and downhole water sink assisted gravity drainage (GDWS-AGD) is a promising gas-based enhanced oil recovery (EOR) process applicable for reservoirs associated with infinite aquifers. However, it can be costly to implement because it typically involves the drilling of multiple vertical gas-injection wells. The drilling and well-completion costs can be substantially reduced by using additional completions for gas injection in the oil production wells through the annulus positioned at the top of the reservoir. Multi-completion-GDWS-AGD (MC-GDWS-AGD) can be configured to include separate completions for gas injection, oil, and water production in individual wells. This study simulates the MC-GDWS-AGD process applied to the synthetic reservoir (PUNQ-S3, based on a real North Sea Field) by placing multiple completions in two wells, which include a gas injection loop, and 2-horizontal wells with a diameter of 2⅜ inch, first one for producing oil located above the oil/water contact and the second one for water sink placed below the oil/water contact. Hydraulic packers are positioned to isolate the multiple completions and an electric submersible pump are positioned to produce the water zone. These results compare to a base case involving no MC-GDWS-AGD wells, which achieved 55.5% oil recovery and 70% water cut.

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Development of A Multi-Completion-Gas and Downhole Water Sink-Assisted Gravity Drainage MC-GDWS-AGD Process to Enhance Oil Recovery and Reduce Water Cresting in Reservoirs With Strong Water Aquifers

Al-Tammimi¹,

Al-Maliki²,

Alabody

et al. 2022

Day 2 Tue, May 03, 2022

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The Gas and Downhole Water Sink-Assisted Gravity Drainage (GDWS-AGD) process functions to enhance oil recovery by placing vertical gas injectors at the top of the reservoir combined with a series of horizontal wells located in the lower part of the reservoir for oil and water production. The injected gas accumulates to form or enhance a gas cap, while oil and water drain by gravity towards the base of the reservoir due to their heavier densities. To further enhance oil recovery, and to overcome the economic limitations of using vertical gas injectors, multi-completion production wells can also be used for gas injection through their annulus sections. This novel configuration thereby achieves Multi Completion-Gas and Downhole Water Sink-Assisted Gravity Drainage (MC-GDWS-AGD). The feasibility of MC-GDWS-AGD is investigated in this study by numerical simulation of the heterogeneous PUNQ-S3 reservoir, which is surrounded and supported by strong aquifers. The MC-GDWS-AGD process aims to minimize water cut in oil production wells from offshore reservoirs with bottom water drives and strong water coning tendencies. In the combined technologies, the gas is injected through the annulus of 7-inch production casings at the top of the reservoir. Then the same casing is dually completed for two 2-3/8 inch horizontal tubing strings: one above the oil-water contact for oil production, and one beneath that contact to function as the water sink. The two completions are hydraulically isolated within the wellbore by a packer. The lower (water sink) completion employs a submersible pump and water-drainage perforations. The submersible pump drains the accumulation of water from around the well. By doing so it prevents the water from breaking through into the oil column and adversely affecting production through the horizontal oil-producing perforations. The heterogeneous multilayered PUNQ-S3 reservoir, which is surrounded by infinite aquifers, was considered to simulate this process. The MC-GDWS-AGD process simulation is designed to evaluate oil flow rate, cumulative oil production, and water cut in oil production wells. The simulation compares the performance of MC-GDWS-AGD with the GAGD and GDWS-AGD completion configurations. The simulation results reveal similar performance for the MC-GDWS-AGD and GDWS-AGD configurations, for all the parameters considered. The GDWS-AGD method slightly outperforms the MC-GDWS-AGD method by achieving a small increase in cumulative oil production from 1.8x 106 m3 for the GAGD method to 1.83x 106 m3. Both methods exceeded primary recovery in terms of cumulative oil production. Water cut decreased from 74% in the GAGD method to 63% in the MC-GDWS-AGD process. The oil recovery factor achieved by the MC-GDWS-AGD process increased by about 8% compared to that achieved by the GAGD method. The value of the MC-GDWS-AGD process is associated with its effectiveness to improve oil recovery by reducing the water coning, water cut, and improving gas injectivity, and at the same time reducing well costs. This new process allows for gas injection, oil, and water production to be conducted through a single multi-completed wellbore. This configuration also leads to multiple additional economic benefits, some of which are associated with the reduction of operational surface facilities in offshore oil fields.

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Feasibility of the Gas and Downhole Water Sink-Assisted Gravity Drainage (GDWS-AGD) Process to Enhance the Recovery of Oil in Reservoirs with Strong Aquifer

Cited by 3 publications

References 12 publications

Identifying Average Reservoir Pressure in Multilayered Oil Wells Using Selective Inflow Performance (SIP) Method

Identifying Average Reservoir Pressure in Multilayered Oil Wells Using Selective Inflow Performance (SIP) Method

Development of a Multi-Completion Gas and Downhole Water Sink-Assisted Gravity Drainage (MC-DWS-AGD) to Improve Oil Recovery and Reduce Water Cut in Reservoirs with Strong Water Aquifers

Development of A Multi-Completion-Gas and Downhole Water Sink-Assisted Gravity Drainage MC-GDWS-AGD Process to Enhance Oil Recovery and Reduce Water Cresting in Reservoirs With Strong Water Aquifers

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