An Openhole Memory-Logging System for High-Angle Wells and Bad Hole Conditions

Elkington, Peter; Spencer, M.C.; Spratt, D.L.

doi:10.2118/87403-pa

Cited by 10 publications

(2 citation statements)

References 3 publications

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“…There are several methods. (1,2,3) The system considered here is a shuttle that conveys the memory string inside drill pipe after drilling, so the tools not exposed to the well for extended periods, nor are they exposed to potentially catastrophic loads, giving reliability advantages relative to both LWD and wireline pipe conveyance. The greatest benefit is in wells that do not need to be petrophysically steered with real time formation evaluation logs, and/or where there is a high risk of damage or loss of the BHA.…”

Section: Introductionmentioning

confidence: 99%

“…In both cases the risked cost of memory logging can be advantageous, with the quality and continuity of the data also counting in its favour. The original shuttle system uses a dart pumped from surface to release the logging tools from a latching sub at the top of the shuttle BHA (1) . Additional pumping deploys the tools into openhole, the top of the logging string being retained within the pipe.…”

Section: Introductionmentioning

confidence: 99%

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Pressure Activated Deployment of Openhole Memory Logging Tools Into Directional Wells and Past Bad Hole Conditions

Spencer¹,

Ash²,

Elkington³

2004

Proceedings of SPE Asia Pacific Oil and Gas Conference and Exhibition

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractOpenhole memory logging was introduced in 2000, initially as a more efficient alternative to pipe conveyed quad-combo wireline logs in high angle and horizontal wells and wells with bad hole conditions. By 2001 a range of deployment techniques had been developed that provide high-quality, lowcost, post-drilling formation evaluation logs to supplement basic real-time data (such as navigation and gamma ray). Among the new techniques is a shuttle system that conveys memory tools rapidly to TD inside drillpipe, ideally as part of a wiper or check trip. In one manifestation a dart pumped from surface releases the logging string after the assembly reaches TD, then moves the string from the drillpipe into open hole. This variant has been successful in over 350 wells. In a new development the dart has been eliminated, replaced by an electro-mechanical pressure activated release mechanism that eliminates the dart pumping time, has better power management for longer operations, and is capable of simple two-way communications -a key element in a repeat formation pressure tester being developed for memory operations. A slim variant operates in wells down to 4¼inches bit size.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pressure Activated Deployment of Openhole Memory Logging Tools Into Directional Wells and Past Bad Hole Conditions

Spencer¹,

Ash²,

Elkington³

2004

Proceedings of SPE Asia Pacific Oil and Gas Conference and Exhibition

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Deployment Strategies to Reduce Risk in the Acquisition of Formation Evaluation Data

Kuchinski

2009

All Days

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Effective reservoir management requires sound decision making that is based on formation evaluation data acquired during all stages of the life of the well. Without this data, reservoir understanding is compromised, which can impact long term well productivity. Given the increasing challenges of acquiring data in today's geometrically complex wells, new methods of data acquisition are constantly being developed and refined. This has led to a new area of oilfield innovation called conveyance. This paper is an analysis of the risks associated with the acquisition of formation evaluation data. These risks are generally classified as follows:Non Productive time due to the inability of logging tools getting to bottom. (bridging)Non Productive time due to delays associated with making last minute arrangements for alternative logging methods when bridging problems become too severe.Lost in hole charges associated with permanently sticking logging tools due to challenging hole conditions.Unsound decision making throughout the life of the well, because challenging hole conditions, made the acquisition of formation evaluation data impossible. The risks outlined above can also be assessed depending upon the data requirements and the conveyance method employed. A new risk assessment will be presented that discusses the risks associated with acquiring the data that provides insight into the six main formation properties required by the industry to understand reservoirs. Several conveyance techniques that assure the acquisition of data will be discussed along with case history's of some of these applications. This paper will serve as a means to understand and assess the risks associated with the acquisition of formation evaluation data. It will also increase awareness of the techniques that exist for acquiring data, and ultimately allow for developing the best strategy to acquire formation evaluation data. Introduction As global demand for hydrocarbon resources increases, so to have the challenges associated with determining their nature and location in the subsurface. Factors such as the exploitation of unconventional reservoirs, more development of carbonate reservoirs, and increasing the recovery factor, have increased the need for better understanding of formation properties. At the same time, new drilling technologies and strategies that allow for access to these reservoirs have created new challenges in the acquisition of formation evaluation data. In order to maximize the understanding of the reservoir, the following key formation properties must be determined to the highest level of accuracy possible:LithologyPorosity

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Logging under Harsh Conditions with New Shuttle-Deployed Memory Tools and Impact on Log Quality, Time and Costs

Miranda

Angel

2010

SPE EUROPEC/EAGE Annual Conference and Exhibition

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Operational conditions in certain fields can cause various difficulties during logging operations. When such situations occur, we usually opt for logging-while-drilling (LWD) tools. In this paper, we present field applications and advantages of a new generation of tools called shuttle-deployed memory (SDM) tools. Because they can operate under critical borehole conditions and highly deviated wells, SDM tools offer a viable alternative to LWD. We successfully applied this technology to acquire well-log data in two fields of clastic and carbonate reservoirs in the Barinas-Apure Basin, Southwest Venezuela. In this area, conditioning the hole is a required procedure before running logging tools; therefore, the logging system's capacity to get information while conditioning the borehole favored its application when logging under harsh conditions. We show three cases considering wells with angle of deviation up to 40º, dog leg severity up to 4º/100 ft, and several washout and unsteady zones. A comparison with resistivity measurements obtained using an LWD tool is also included in one of the cases, illustrating remarkable improvements in log quality. We also used the acquired information as an input for petrophysical assessment. The results satisfactorily compared against neighbor wells with data obtained from conventional wireline logging tools and rock-core measurements. Likewise, a detailed analysis of time and cost describes the impact of the application of this type of technology on operations in Guafita and La Victoria Fields in Venezuela. We conclusively found that the application of SDM tools for formation evaluation data acquisition reduces logging time by 62% and logging costs up to 44% in these fields. In addition, we obtained reliable well-log information with significant improvements in log quality. More important, the application of SDM tools allowed us to bypass the limitations in terms of variety and quantity for logs that were commonly acquired with LWD tools.

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An Openhole Memory-Logging System for High-Angle Wells and Bad Hole Conditions

Cited by 10 publications

References 3 publications

Pressure Activated Deployment of Openhole Memory Logging Tools Into Directional Wells and Past Bad Hole Conditions

Pressure Activated Deployment of Openhole Memory Logging Tools Into Directional Wells and Past Bad Hole Conditions

Deployment Strategies to Reduce Risk in the Acquisition of Formation Evaluation Data

Logging under Harsh Conditions with New Shuttle-Deployed Memory Tools and Impact on Log Quality, Time and Costs

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