Water coning control concurrently with permeability estimation using Ensemble Kalman Filter associated boundary control approach

Safari, Mehdi; Ameri, Mohammad; Gholami, Raoof; Rahimi, Ali

doi:10.1016/j.petrol.2021.108590

Cited by 2 publications

(1 citation statement)

References 21 publications

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“…During an early production period, bottom water can play a role in complementing formation energy. , Once the product enters the middle or late stage, severe water invasion will cause many problems, such as a shortage period of water-free oil production, a rapid rise in water cut, even violent water invading, a low oil recovery factor, etc. These problems directly affect the production efficiency in the oilfield. − Bottom water invasion is the key to restricting the effective development of bottom-water reservoirs.…”

Section: Introductionmentioning

confidence: 99%

Macro- and Microanalysis on Noncondensable Gas Antiwater Invasion in a Bottom Water Reservoir with a Rupturable Interlayer

et al. 2022

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Developing a bottom-water reservoir with rupturable interlayers is a significant challenge. This paper used a 2D visualization model to study the seepage characteristics of gas–water in two phases during noncondensable gas antiwater invasion. On this basis, the mechanisms of antiwater invasion and enhanced oil recovery (EOR) were summarized. The results show that bottom water advances from the crack of the interlayer to the oil layer, leading to a profile of radial flow. The major swept area occupies the scope near the horizontal well and the oil layer’s middle part. Therefore, a lot of remaining oil distributes beside the crack of the interlayer. Noncondensable gas preferentially flows into the water-swept area due to a lower seepage resistance. Under gravity differentiation, the dispersed gas displaces the invaded bottom water downward, inhibiting water from invading and increasing the oil production rate. These studies provide practical guidance for analyzing bottom-water invading processes and designing suitable measures to develop such reservoirs.

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Section: Introductionmentioning

confidence: 99%

Macro- and Microanalysis on Noncondensable Gas Antiwater Invasion in a Bottom Water Reservoir with a Rupturable Interlayer

et al. 2022

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Distribution of Flow Characteristics and Productivity Evaluation of Herringbone Wells in Bottom-Water Reservoirs

Liu,

Cui,

Zhou

et al. 2024

Journal of Energy Resources Technology, Part B: Subsurface Energy and Carbon Capture

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With the characteristics of large drainage area and low drilling cost, the herringbone wells have become an important way to increase the well production, delay the coning and ridge of bottom water and improve the development effect. Due to the complexity of the herringbone wells flow characteristics, results that exists certain gap between the current production prediction and the actual production, so it is of great significance to study the flow and productivity of herringbone wells. In this paper, taking bottom-water reservoir as the research object, considering the interference between branch wellbore and perforations, analysis the flow characteristics and the productivity sensitivity factors of herringbone wells. The results show that the transient flow time in the reservoir is short, the closer to the wellbore, the greater the pressure changes. With the increases of the branches number, branches length and branch angle, the per unit length of the wellbore radial inflow decreases, and the decrease slows down after exceeding 3 branches. In the high anisotropy reservoirs, the phase angle has greater impact on the productivity of the herringbone well when the perforation density is low, at 180°, phase angle is best; when the perforation density exceeds 16 shots/m, the increase of productivity degree decreases. This study provides important guiding significance for the actual application in oil fields to optimizing the herringbone wells shape, rational production allocation, specifying reasonable work systems and enhance oil recovery in the bottom water reservoirs.

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Water coning control concurrently with permeability estimation using Ensemble Kalman Filter associated boundary control approach

Cited by 2 publications

References 21 publications

Macro- and Microanalysis on Noncondensable Gas Antiwater Invasion in a Bottom Water Reservoir with a Rupturable Interlayer

Macro- and Microanalysis on Noncondensable Gas Antiwater Invasion in a Bottom Water Reservoir with a Rupturable Interlayer

Distribution of Flow Characteristics and Productivity Evaluation of Herringbone Wells in Bottom-Water Reservoirs

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