Effects of Downhole Parameters on Horizontal Milling Applications

MacZura, J. M.; Miller, Mark Wade; Scuadroni, N.; Daley, D.

doi:10.2118/174921-ms

Cited by 4 publications

(1 citation statement)

References 5 publications

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“…On the other hand, DWOB can be obtained by combining measurement reading of downhole instrumentation and calibration model. More detailed information can be found in literatures [6,7,8,9].…”

Section: Introductionmentioning

confidence: 99%

A Study of Downhole Weight on Bit Calibration Model and Performance Assessment on Field Trial Data

Hailong¹,

Liu²,

Li³

et al. 2017

dtetr

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Abstract. Obtaining real downhole weight on bit (DWOB) is a critical issue in drilling. In this paper, a weight on bit (WOB) calibration model which converted measurement reading of WOB sensor to force between bit and formation, namely DWOB, was proposed. Influence factors of measurement reading such as pressure, temperature and drillstring kinetics had been discussed in the derivation of the calibration model. Moreover, the model performance assessment was also studied with field trial data. After calibration of WOB sensor reading, DWOB maintains the fluctuating trend around zero in a small range when running drillstring into hole and pulling it out of hole. In addition, calculations indicate that pressure plays a more important role in calibration model compared to other factors. The calibration model is appropriate for both vertical and inclination wells.

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Section: Introductionmentioning

confidence: 99%

A Study of Downhole Weight on Bit Calibration Model and Performance Assessment on Field Trial Data

Hailong¹,

Liu²,

Li³

et al. 2017

dtetr

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Challenging the Industry's Understanding of Hole Cleaning During the Drillouts of Frac Plugs with a New Holistic Approach

Ryan

Gohari

Bilic

et al. 2019

Day 1 Mon, September 30, 2019

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Development of unconventional reservoirs in North America has increased significantly over the past decade. The increased activity in this space has provided significant data with respect to through-tubing drillouts which had previously not been attainable. This paper is focused on using the field data from the Montney and Duvernay formations along with laboratory data and numerical modeling to understand the hole cleanout associated with through-tubing drillouts of frac plugs. Initially, an extensive full-scale flow loop laboratory testing program was conducted to obtain data on debris transportation for hole cleanout during through-tubing applications. The testing was conducted on various coiled tubing (CT)-production tubing configurations using various solid particles. The laboratory data was used to develop empirical correlations needed for a transient debris transport model. This model was then used for frac plug drillouts to ensure successful hole cleaning in actual field applications. Computational fluid dynamics (CFD) modelling was also used to further understand and quantify the differences between the laboratory data, field data and transient debris transport model results. The objective of the work conducted was to gain a better understanding of debris transport and validate the empirical modelling approach developed for hole cleaning. The validation process was conducted in several stages. The first stage was to validate the laboratory data against the Montney and Duvernay field data. The second stage was to verify the results obtained from the empirical model against the results obtained from a computational fluid dynamic model. The results from both modelling approaches were lastly compared to the field data. All these results challenge the current industry's understanding and best practices for through-tubing drillouts in the Montney and Duvernay formations. With the contentious increase of lateral lengths and higher stage counts, the process of drilling out frac plugs has become more complex. This study explicitly benefits all operators in their ever-increasing need to understand their frac plug drillout operations to ensure efficient, cost effective, and most importantly, consistent and repeatable results. While efficient results for frac plug drillout operations have been accomplished to date, the on-going feedback from the field has been the requirement to produce repeatable drillouts. This paper is the first to show a holistic approach for obtaining a transient debris transport model used for through-tubing drillouts of frac plugs. The novelty also consists of the transient debris transport model validation through laboratory data and actual Montney and Duvernay field data.

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Unlocking Operational Efficiencies for Milling Plugs in Large Monobore Completions Using Coiled Tubing with Real-Time Downhole Measurements - A Case Study from Offshore Middle East

Fonseca

Molero

Ramondenc

et al. 2020

Day 1 Tue, March 24, 2020

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Coiled tubing (CT) milling of downhole plugs in large monobore completions is considered one of the most challenging CT workover operations, especially when conducted in offshore environments where intervention workflows are driven by efficiency gains for operators and service companies alike. Experience gained from milling operations using CT instrumented with real-time data enabled measurable improvements in efficiency. Post-job data analysis offered additional insights to improve methodologies and further unleash untapped efficiencies. Real-time bottomhole assembly data were collected during plug milling operations using a positive displacement motor. Critical downhole readings, such as CT internal and annular pressure, axial force (thrust), and torque were monitored during the operation to identify tagging of isolation plug targets, onset of milling, and stalls. The real-time data not only added confidence to event confirmation, but also increased the accuracy in estimating efficiency metrics such as rate of penetration (ROP) and stall recovery duration. Post-job analysis calculated the error and shortcomings associated with estimating event detection based on surface measurements. Additionally, error in event detection was tied back to inaccuracies in estimating efficiency metrics when relying on surface measurements alone. Analysis of downhole measurements in CT milling improves the precision of event detection and enables rapid reactions. Target tagging reflects instantly in thrust, and motor activation reflects synchronously in downhole differential pressures and torque, which together provide certainty of motor engagement on the target. Stalls reflect in differential pressure and torque spikes that coincide with motor specifications. ROP more than doubled by leveraging these event detection techniques throughout milling operations. New torque-thrust signatures were also identified to detect material interfaces. Changes in signature behavior indicated when the bit milled through one target and reached the next. This is particularly useful when the operator must mill through a target but stop at a subsequent, contiguous one. Post-job data also suggested that some events may have been mistaken as stalls during the operation, with downhole data confirming they were false positives. Finally, at operating conditions in the case study, a 7-second lead-time window was identified to anticipate and react to stalls. This highlights the importance of access to real-time downhole information, such as differential pressure, to avoid both stalls and false positives, and ultimately, to make breakthroughs in operational efficiency. Integrated analysis of downhole measurements during CT milling lent visibility to actual ROP, stall rates, and stall recoveries. These constitute important baselines against which any improvement in efficiency must be compared. The methodologies proposed here for event detection, with special attention to stall anticipation and milling interface detection, pave the way for smarter, more efficient operations.

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Effects of Downhole Parameters on Horizontal Milling Applications

Cited by 4 publications

References 5 publications

A Study of Downhole Weight on Bit Calibration Model and Performance Assessment on Field Trial Data

A Study of Downhole Weight on Bit Calibration Model and Performance Assessment on Field Trial Data

Challenging the Industry's Understanding of Hole Cleaning During the Drillouts of Frac Plugs with a New Holistic Approach

Unlocking Operational Efficiencies for Milling Plugs in Large Monobore Completions Using Coiled Tubing with Real-Time Downhole Measurements - A Case Study from Offshore Middle East

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