An Accurate Characterization of Sand Strength in Weak and Unconsolidated Formations Aids Offshore Production Test Designs - A Bohai Bay Case Study

Ong, Seehong; May, A N; George, Ian; Walker, Tim; Zheng, Ziqiong

doi:10.2118/64738-ms

Cited by 9 publications

(2 citation statements)

References 3 publications

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“…Typical problems such as plugging, sanding, and no or lost seal have been reported many times. Ong et al report sanding can take place typically when a drawdown of more then 400 psi is initiated 9 .…”

Section: Bohai Bay -Unconsolidated Formation Pressure Testingmentioning

confidence: 99%

Formation Pressure Testing while Drilling in Bohai Bay's Challenging Environment

Hahne

Pragt

Venier

et al. 2006

International Oil &Amp; Gas Conference and Exhibition in China

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThis paper describes the experience and lessons learned to acquire logging while drilling (LWD) formation pressure and near-wellbore mobility data in Bohai Bay. This area is known to be difficult in terms of measuring key parameters for reservoir description in conventional wireline logging (WL) programs.While comparisons between WL and LWD, including costs savings associated with the LWD approach, are common today in operators' minds, the intangible benefits gained by real-time acquisition of these critical data are often neglected. Incorporating formation pressure testing into the drilling process, on the other hand, creates challenges to perform measurements in a timely manner as well as the need for continuous circulation while testing to ensure wellbore safety.Formation testing at Bohai Bay is difficult because of the unconsolidated formations and all aspects associated with this type of environment, such as borehole stability, hole washouts, sanding while testing, or lost seals.This paper describes successful test procedures, like the orientation of the probe into any direction, and discusses test examples from various hole sizes in detail. The key to achieve a high sealing success rate seems to be the ability to control and adjust the pad contact forces against the formation. Analyzing each drawdown sequence in the tool downhole and optimizing the drawdown rate and speed in the consecutive test reduces effects like sanding and improves the overall success rate.Providing this type of formation evaluation data with an LWD tool allows a continuous approach to data evaluation and decision-making. The ability to measure accurate LWD formation pressure data in a variety of hole sizes represents a significant opportunity for safe and cost-efficient wellbore construction, especially in environments like Bohai Bay.

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Section: Bohai Bay -Unconsolidated Formation Pressure Testingmentioning

confidence: 99%

Formation Pressure Testing while Drilling in Bohai Bay's Challenging Environment

Hahne

Pragt

Venier

et al. 2006

International Oil &Amp; Gas Conference and Exhibition in China

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“…The Mechanical Properties log can also predict the critical drawdown pressure (CDP) at which sand production can be expected. 2 The job can not be considered a success unless verification is provided that the guns actually fired in the desired orientation.…”

Section: Introductionmentioning

confidence: 99%

Advances in Horizontal Oriented Perforating Optimize Perforating and Production While Maintaining Borehole Stability

Benavides¹,

Myers²,

W.³

et al. 2003

Proceedings of SPE Asia Pacific Oil and Gas Conference and Exhibition

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Correlation of Rock Mechanic Properties with Wireline Log Porosities through Fulla Oilfield - Mugllad Basin -Sudan

Khair

Zhang

Abdelrahman

2015

Day 1 Mon, September 14, 2015

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The current study presents elastic properties model for Fulla Oilfield in northeast of Block 6 in south of Sudan. Due to the poor formation consolidation and relatively viscose fluid, reservoirs may predictably produce massive amounts of sand and numerous troubles were found in the field as a result of sanding. No documented researches were found to introduce good parameters for rock strength and rock failure conditions through the field. Therefore, an accurate technique for predicting rock failure conditions may yield good profits and improve the economic returns through preventing sand production from the formations. General correlations were presented to accurately describe rock strength parameters for the field; the work utilizes the application of the wireline porosities to be used as a strength indicator through the combination of rock mechanical theories with the characterization of Fulla oilfield. Log porosities (density, sonic and neutron) were calibrated with the core measured porosity, and the best matching porosity were correlated with the dynamic calibrated strength parameters by different correlations. The results support the evidence of the use of porosity as an index for mechanical properties; power functions were found more reliable than the exponential functions, and can be used with a high degree of confidence; also it is more accurate than the Shale Index model presented in pre-vious work for same field; however, the result does not support the direct linear expression pre-sented in the literature for other field due to the variations in the field conditions.

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An Accurate Characterization of Sand Strength in Weak and Unconsolidated Formations Aids Offshore Production Test Designs - A Bohai Bay Case Study

Cited by 9 publications

References 3 publications

Formation Pressure Testing while Drilling in Bohai Bay's Challenging Environment

Formation Pressure Testing while Drilling in Bohai Bay's Challenging Environment

Advances in Horizontal Oriented Perforating Optimize Perforating and Production While Maintaining Borehole Stability

Correlation of Rock Mechanic Properties with Wireline Log Porosities through Fulla Oilfield - Mugllad Basin -Sudan

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