Defining Sand Control in an Uncharted Frontier: A Case Study on the Zawtika Field Development in Myanmar

Grant, Graham; Soon, Lee Boo; Moses, Nicholas; Syifaa'i, Arfi; Wallace, Cal; Ling, Chin; Kikuchi, Masato

doi:10.2118/181596-ms

SPE Annual Technical Conference and Exhibition 2016

DOI: 10.2118/181596-ms

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Defining Sand Control in an Uncharted Frontier: A Case Study on the Zawtika Field Development in Myanmar

Graham Grant¹,

Lee Boo Soon²,

Nicholas Moses

et al.

Abstract: This paper covers the design, execution, and evaluation of the development of the Zawtika field operated by PTTEPI in Myanmar. This includes the study of the reservoir, the selection of completion methodology, the operational challenges, and the performance of the wells. The Zawtika field development focused on the laminated Plio-Pleistocene reservoirs. The formation comprises a thick sequence of mixed deltaic and shallow marine clastic sediments. A conservative geomechanics study indicated that… Show more

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Cited by 3 publications

References 8 publications

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An Integrated Approach to the Design and Modelling of High Rate Water Pack Treatments

Govinathan¹,

Sallis²,

Jain³

et al. 2022

SPE International Conference and Exhibition on Formation Damage Control

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High Rate Water Pack (HRWP) treatments are used in cased hole gravel packs with the intention of creating small fractures to bypass near wellbore damage and improve perforation packing. Despite their popularity as a sand control technique, there has never been a software model developed specifically for HRWP treatments, and so their design has been largely driven by trial-and-error based on local field experience. Often, local field experience is insufficient to achieve the desired results due to uncertainties in the fracture initiation, propagation and packing mechanisms. The ability to model the initiation and packing of the fracture provides a better understanding of the achievable perforation packing in a specific well and how to maximize it. Such a model must simultaneously simulate fluid hydraulics, wellbore packing, fracture initiation and propagation, and gravel placement. Models exist for gravel packing that can predict packing in the wellbore annulus and perforations, but they do not account for initiation, propagation and packing of the fractures. Multiple models are also available specifically for fracturing design, but most of these do not account for wellbore packing. These models are more suited for conventional hydraulic fracturing and frac pack treatments using highly viscous or crosslinked fluids. Such fracturing models tend to overpredict fluid leak-off in soft rock formations, especially with low viscosity fluids, and consequently predict premature screen-outs under conditions in which HRWP treatments are in practice successfully placed. This paper introduces the first software model that combines both wellbore and perforation packing, along with the initiation and packing of small fractures, to facilitate successful HRWP treatments. Examples of how the model can be used to optimize HRWP treatments are discussed and the various parameters that impact HRWP design are also assessed. Several case studies are presented comparing modelled and actual data to both validate the model and demonstrate how it can be used to optimize the designs for offset wells.

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An Integrated Approach to the Design and Modelling of High Rate Water Pack Treatments

Govinathan¹,

Sallis²,

Jain³

et al. 2022

SPE International Conference and Exhibition on Formation Damage Control

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Sand Production Management the Critical Challenge in Zawtika Gas Production

Junmano¹,

Lee²,

Grant³

et al. 2016

Day 2 Tue, November 15, 2016

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To ensure safe operations and to maximize well potential, PTTEPI has formulated a sand production management strategy to reduce risks due to sand production while extracting natural gas resources from the young clastic reservoirs formed during Plio-Pleistocene geological sequence. Over the 2 years of historical production, the strategy has been fine-tuned and enhanced to improve its effectiveness in managing sand production. The strategy integrates efforts from both subsurface and surface disciplines. It covers initial well completion design to address the need for sand control, continuous recording and analysis of performance data after a well is put on production to monitor and manage sand production within acceptable limits, data acquisition programs to obtain additional information for analysis of sand production, and remedial and mitigation initiatives to address sand production. The following sections will discuss, in more detail, each component of the sand production management strategy.

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Batch Completion Operations Cost Reduction in a Segregated Drilling Campaign: Surface Equipment Requirements

Canny¹

2017

Day 3 Wed, May 03, 2017

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In an effort to reduce project construction and start-up costs, novel and alternative well construction models have been developed and adopted globally. One such approach is to adopt a segregated drilling campaign, the well construction and completions operations can be segregated into two distinct phases. A drilling and casing phase leaving a cased well in a Temporary Abandonment (TA) status, followed by a phase consisting of WBC (wellbore clean-up), completion and stimulation operations resulting in the handover of the well to production to bring hydrocarbon production online. As such this provides an opportunity to reduce surface equipment specification and costs, in comparison to that which is required for drilling activities. A potential solution exists by utilising alternative technology with the capability to perform perforation, multi-zone completion installation, stimulation, WBC operations and well testing, at comparatively lower cost than conventional drilling technology. This paper describes the collaborative development of such technology, and focuses on the definition of the surface equipment requirements and specification phase, pertaining to the typical downhole operations required to be executed during the multi-zone completion installation, stimulation, WBC operations and well testing. Each operation is assessed to give a base required capability, with further operations that are deemed to have a critical effect on the efficiency and duration, identified. A typical anticipated operations program is presented and the study focuses on the first principle requirements of each of the steps. Further operation considerations are presented and discussed for each operational step, forming the basis of discreet specifications per step. Further, the identification of operations not on the critical path that can be performed simultaneously or as an offline activity, have the potential to make high cost impacts. Collaboration between the Yangon based operator and service provider drives a design which provides a technically pragmatic and capable ICU (Intervention and Completion Unit) and as such attracting project cost savings allied to lower support equipment costs. Further, the deployment flexibility of the ICU allows it to perform operations ranging from well construction activities such as well slot preparation, completions and intervention, to well deconstruction activities such as heavy workover, Permanent Abandonment (PA) phases and slot recovery. The ability to perform multi-phase operations whilst mobilized to a platform brings further cost benefits and operational flexibility.

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Defining Sand Control in an Uncharted Frontier: A Case Study on the Zawtika Field Development in Myanmar

Cited by 3 publications

References 8 publications

An Integrated Approach to the Design and Modelling of High Rate Water Pack Treatments

An Integrated Approach to the Design and Modelling of High Rate Water Pack Treatments

Sand Production Management the Critical Challenge in Zawtika Gas Production

Batch Completion Operations Cost Reduction in a Segregated Drilling Campaign: Surface Equipment Requirements

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