Case Study: Sand Management Evolution in a Brownfield

Gonzalez, Luis; Rivero, Maria Elba; Curteis, Charles; Amaleswaran, Devina

doi:10.2118/168114-ms

Day 1 Wed, February 26, 2014 2014

DOI: 10.2118/168114-ms

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Case Study: Sand Management Evolution in a Brownfield

Luis Gonzalez

Maria Elba Rivero

Charles Curteis

et al.

Abstract: A Brown field has been in production for over 30 years. A redevelopment plan started in 2004 to revamp oil production under an Alliance partnership between an Oil & Gas Company Malaysia and Schlumberger. The mentioned Brown field is a multilayered reservoir where the UCS can vary from 1500 psi in the consolidated sand until less than 800 psi in the shallow zones. Based on a geomechics study and existing production history of the field, unconsolidated producer sands were identified and sand c… Show more

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Cited by 3 publications

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Optimisation of Tubing Conveyed Perforations: Combination of Dynamic Underbalance and Mechanical Surge Techniques

et al. 2014

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A Brown field, offshore Malaysia, has been in production for over 30 years. The Brown field has low rock strength in shallow reservoirs, while the deeper reservoirs consist of stronger and stiffer formations. As a result, the completion for shallow reservoirs requires gravel pack treatment, whereas the deeper reservoirs can be completed without particular requirements of sand control.Big hole charges followed by mechanical surge are the preferred perforating technique for an optimum gravel pack. For consolidated formations, deep penetration charges, with a dynamic underbalance, are more suitable to maximize inflow. Historically, multi-zone completions in field wells are performed in stages: the deeper zone is perforated and conditioned first; followed by the upper interval, which is perforated, gravel packed, completed and connected to the lower section.This paper presents the combination of the two perforating techniques in one operation. It also discusses the candidate identification process, perforation design, formation damage analysis, execution and results. The gravel packs were performed successfully with a GP factor higher than predicted by simulations, and the initial production behavior suggests no evidence of adverse effect on formation damage even when the mechanical surge required for the big hole charges was done higher than conventionally.Considerable rig time savings were achieved by eliminating a Tubing Conveyed Perforations (TCP) run and clean out operation. The operation was performed in 60.8% of the time observed in a previous similar well. The combined perforating technique is suitable for cases where the reservoir properties are very well known.Based on the result of the world first combination of these techniques, continue supporting the implementation of this optimized solution in future wells is high recommended. Perforating StrategyTubing Conveyed Perforation (TCP) is the technology used for perforation in this field, both Dynamic Underbalanced Perforating (DUP) and Mechanical Surge Technique systems will be utilized on a dependent basis.

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Optimisation of Tubing Conveyed Perforations: Combination of Dynamic Underbalance and Mechanical Surge Techniques

et al. 2014

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Case Study: Design, Execution and Results of Retrieving Challenged Gravel Packs, the Future in Workovers

et al. 2015

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Workover is the process of performing major maintenance or remedial treatments on an oil or gas well to restore, prolong or enhance its production. The complexity of workover operations is increasing due to the well conditions faced, such as age, environment, mechanical restrictions, completion design, number of completed zones, downhole equipment installed, etc. Well workover can represent up to 49% cost reduction over its sidetrack option, making it economical; but it may require good sand control understanding, and comprehensive procedures, to retrieve existing gravel pack (GP) assemblies, an operation that possess the risk of getting stuck and/or being unable to retrieve the assembly and eventually abandoning the well. For many years the Oil Industry has rejected workover candidates because of risk aversion overriding cost and value added; the actual workover opportunities include new challenges such as retrieving Alternate Path screens. This paper discusses the design, risk management approach and the challenges faced during execution, as well as the lessons learnt, of two workover wells in a brown field; both candidates had several challenges such as: Old completion,Lack of reference data,Length of screens (500 ft of screens)Sand productionDifferences to retrieve Wire Wrap and Alternate Path screens The two successful retrieval of the sandface completion in both wells were the first and second operation of its kind performed by the operator and provide field experience and best practices for future similar operations. Furthermore; the study of the retrieved assembly, after over 20 years of production, helped to understand the sand management system failure mode and the reasons for the sand production issue; knowledge that will impact future well designs in the field.

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Risk Assessment in Sand Control Selection: Introducing a Traffic Light System in Stand-Alone Screen Selection

Mahmoudi

Fattahpour

Velayati

et al. 2018

Day 3 Wed, December 12, 2018

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Sand control and sand management require a rigorous assessment of several contributing factors including the sand facies variation, fluid composition, near-wellbore velocities, interaction of the sand control with other completion tools and operational practices. A multivariate approach or risk analysis is required to consider the relative role of each parameter in the overall design for reliable and robust sand control. This paper introduces a qualitative risk factor model for this purpose. In this research, a series of Sand Retention Tests (SRT) was conducted, and results were used to formulate a set of design criteria for slotted liners. The proposed criteria specify both the slot width and density for different operational conditions and different classes of Particle Size Distribution (PSD) for the McMurray oil sands. The goal is to provide a qualitative rationale for choosing the best liner design that keeps the produced sand and skin within an acceptable level. The test is performed at several flow rates to account for different operational conditions for Steam Assisted Gravity Drainage (SAGD) and Cyclic Steam Stimulation (CSS) wells. A Traffic Light System (TLS) is adopted for presenting the design criteria in which the red and green colors are used to indicate, respectively, unacceptable and acceptable design concerning sanding and plugging. Yellow color in the TLS is also used to indicate marginal design. Testing results indicate the liner performance is affected by the near-wellbore flow velocities, geochemical composition of the produced water, PSD of the formation sand and fines content, and composition of formation clays. For low near-wellbore velocities and typical produced water composition, conservatively designed narrow slots show a similar performance compared to somewhat wider slots. However, high fluid flow velocities or unfavorable water composition results in excessive plugging of the pore space near the screen leading to significant pressure drops for narrow slots. The new design criteria suggest at low flow rates, slot widths up to three and half times of the mean grain size will result in minimal sand production. At elevated flow rates, however, this range shrinks to somewhere between one and a half to three times the mean grain size. This paper presents novel design criteria for slotted liners using the results of multi-slot coupons in SRT testing, which is deemed to be more realistic compared to the single-slot coupon experiments in the previous tests. The new design criteria consider not only certain points on the PSD curve (e.g., D50 or D70) but also the shape of the PSD curve, water cut, and gas oil ratio and other parameters.

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Case Study: Sand Management Evolution in a Brownfield

Cited by 3 publications

References 6 publications

Optimisation of Tubing Conveyed Perforations: Combination of Dynamic Underbalance and Mechanical Surge Techniques

Optimisation of Tubing Conveyed Perforations: Combination of Dynamic Underbalance and Mechanical Surge Techniques

Case Study: Design, Execution and Results of Retrieving Challenged Gravel Packs, the Future in Workovers

Risk Assessment in Sand Control Selection: Introducing a Traffic Light System in Stand-Alone Screen Selection

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