Reservoir Characterization from Gas Ratio Analysis Using New High Efficiency Gas Extraction System

Zhou, Leifeng; Blue, Duncan

doi:10.2523/iptc-13594-ms

Cited by 4 publications

References 3 publications

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Use of Standard PVT Measurements to Enhance the Understanding of Reservoir Behavior

Fabbri¹,

Poirier²,

Odeniyi³

et al. 2017

Day 3 Wed, August 02, 2017

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In the Amenam-Kpono field, three main reservoirs are currently being produced: R11, R10 and R4. During the first phase of its development, the production strategy was to re-inject the associated gas from all reservoirs into the R4 reservoir in order to maintain the initial reservoir pressure above the saturation pressure, close to initial pressure. The deeper reservoirs R10 and R11 were first produced under natural depletion as their initial pressures were far from saturation pressure. Water injection was progressively deployed on R4, R10 and R11 in order to ensure voidage replacement. In order to monitor the efficiency of gas injection, a gas tracing campaign has been carried out in 2005, improving the understanding of R4 flow barriers and showing that some of the gas injected had broken-through. However, ideally, such a campaign should be repeated regularly so as to take into account the change in pressure regimes that will affect the dynamics of the field. In practice, implementing it regularly is challenging, due to the cost associated to the chemicals and logistics. This paper aims to describe a "low cost" monitoring method based on produced gas composition follow-up and its evolution through the life of the field. It shows how the composition of the gas produced has been recently used as a natural tracer. This approach has improved the understanding of the reservoir dynamics, in terms of compartmentalization and flow distribution across different perforations.

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Use of Standard PVT Measurements to Enhance the Understanding of Reservoir Behavior

Fabbri¹,

Poirier²,

Odeniyi³

et al. 2017

Day 3 Wed, August 02, 2017

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A New Methodology for Total Gas Monitoring to Improve Well Safety Assurance

Shahini

Nonno

Zanchi

et al. 2019

Day 2 Tue, November 12, 2019

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At a time when maximizing operational efficiency is needed more than ever, advancements in data processing and analytical capacity may provide a sustainable path for uncovering hidden correlations and other insights from one of the basic roles and responsibilities of any surface logging services provider. This paper showcases a side-by-side comparison of two gas extraction devices and how they influence gas readings and, eventually, total gas measurement related to well control operations monitoring. Although the trend analysis from gas reading values is imperative for pore pressure predictions and other classical readings, this paper negates its use for lower explosive limits (LEL) by using laboratory methods paired with a study in the field. The apparatus used to extract total gas in water-based mud was a constant-volume, constant-temperature and constant-flow system. The detector used to measure the total gas concentration was a flame-ionized detector (FID) system. The influence of gas extraction devices on gas data is crucial for the determination of total gas. Conditions affecting gas readings have been explored at length, and they include gas extraction temperature, mud flow rates, gas flow rates, and drill rates (i.e., rate of penetration). Due to the development of analytical capacity, the extraction method and the analysis devices are compared in this paper. Wellsite total gas monitoring, which usually provides common wellsite total gas values, has been heavily analysed regarding what it fundamentally represents. Total gas also helps operators to harness their data and use it to identify process safety indicators, as well as other environmental emissions applications. Estimates of total gas concentration in the drilling fluid, as detected by a gas extraction device, can vary, based on the device type. This paper shows how the different extraction methodologies fit into well safety operations monitoring and process safety requirements to better evaluate and define new risk communication and safety practices in the industry.

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Optimization of the Gas-Extraction Process in a New Mud-Logging System

Marum

Afonso

Ochoa

2019

SPE Drilling &Amp; Completion

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SummaryAn advanced gas analysis heated system (AGAHS) analyzes the gas extracted from a water-based mud (WBM) to estimate the hydrocarbons contents in drilled rock formations. Operating conditions within the gas-extraction device (gas trap) such as the gas concentration in the mud, stirring velocity, mud-flow rate and temperature, and ditch-line flow rate and pressure are studied to maximize the gas-extraction efficiency in the gas trap. The operating conditions that most affect the gas-extraction efficiency are the stirring velocity and the mud-flow rate. The highest and most stable gas-extraction efficiencies are obtained at 1,680 rev/min and 1.0 L/min.

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Reservoir Characterization from Gas Ratio Analysis Using New High Efficiency Gas Extraction System

Cited by 4 publications

References 3 publications

Use of Standard PVT Measurements to Enhance the Understanding of Reservoir Behavior

Use of Standard PVT Measurements to Enhance the Understanding of Reservoir Behavior

A New Methodology for Total Gas Monitoring to Improve Well Safety Assurance

Optimization of the Gas-Extraction Process in a New Mud-Logging System

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