Nuclear Attribute and Tool Modelling for Enhancing Reservoir and Well Surveillance (Russian)

Alkhasov, Emin; Han, Xiaogang; Webster, Michael; Zett, Adrian

doi:10.2118/177333-ru

SPE Annual Caspian Technical Conference &Amp; Exhibition 2015

DOI: 10.2118/177333-ru

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Nuclear Attribute and Tool Modelling for Enhancing Reservoir and Well Surveillance (Russian)

Emin Alkhasov¹,

Xiaogang Han²,

Michael Webster³

et al.

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Cited by 4 publications

References 7 publications

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New Applications of Multidetector Pulsed Neutron Technologies in Gravel Pack Completions

Han¹,

Scott²,

Schoepf³

et al. 2017

SPE Annual Technical Conference and Exhibition

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Gravel Pack (GP) and Frac Pack (FP) are common sand control completion designs. There are various well known methods to evaluate effectiveness of gravel placement in the screen - casing annulus, allowing top of pack detection, void location and gross pack quality assurance. The increasing trend in using Non Radiation Traceable (NRT) proppant in both open and cased hole completions assists the evaluation of pack quality when using pulsed neutron logging technologies. Unlike traditional GP and FP evaluation techniques, Multi-detector Pulsed Neutron (MDPN) instrumentation provides a broader suite of nuclear attributes that can be used both qualitatively and quantitatively. Moreover, MDPN data can provide a baseline fluid saturation as has been widely documented. Multiple datasets obtained from yard tests and two observation wells have been used to benchmark theoretical models based on multiple tool response equations. MDPN time lapse data and other static and dynamic log data will be discussed to emphasize the value of NRT proppant and MDPN surveillance during well life. The complexity of the logging environment means that a huge amount of rigor is required in the areas of job planning and execution in order to ensure the resultant dataset is optimized for use quantitatively. It is possible to generate a GP Quality Index scaled from 0% (no pack) to 100% (perfect pack) using one or more nuclear attributes depending upon the environmental conditions. This paper will describe the advantages and disadvantages of each of the conventional GP evaluation techniques based on datasets from both yard test and live wells. For NRT / MDPN applications, the processed nuclear attributes resulting from the NRT/MDPN GP evaluation show reduced uncertainty when compared with the conventional logging techniques. Using MDPN for GP evaluation also means this data can be used for other reservoir and well surveillance applications.

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New Applications of Multidetector Pulsed Neutron Technologies in Gravel Pack Completions

Han¹,

Scott²,

Schoepf³

et al. 2017

SPE Annual Technical Conference and Exhibition

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Nuclear Attributes Selection and Utilization to Address ACG Late Field Development Challenges

Alkhasov¹,

Han²,

Zett³

2017

Day 1 Wed, November 01, 2017

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The late stage development of ACG field poses new challenges that can be addressed through completion technologies associated with new or improved methods of surveillance using Multidetector Pulsed Neutron (MDPN) instrumentation. In this paper we will describe the techniques developed and deployed to address specific well and reservoir challenges. The topics will include: –Evaluate the quality of the initial fill and subsequent changes to various types of proppant with stand-alone and time lapse logging for Open Hole Gravel Pack completions–Identification of scale depositing behind the screens–Monitoring the gas cap movement and sweep efficiency in difficult environments (large casing in holes enlarged by reamer, heavy mud in borehole,) The nuclear modelling has a key role in the early planning stage, enabling the selection of appropriate instruments and acquisition modes. This will reduce the interpretation uncertainty, and minimise the rig time and production deferment. Coupling MDPN measurements with innovative non-radioactive tracer doped gravel, enable a more efficient and accurate reservoir and well surveillance in Open Hole Gravel Pack Completions. The interpretational techniques combine the measured data with specific models of nuclear attributes benchmarked in yard tests that replicate some of ACG completions. Close quality control of the data during acquisition and proper communication with logging vendor is the key in to proper answers. Using multiple nuclear attributes leads towards a more unique solution in such complex environments. The approach taken along with the results from seven wells will be presented and discussed in detail.

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Swellable Packer Evaluation Using Multi-Detector Pulsed Neutron Logging and Borax

Cedillo¹,

Zett²,

Han³

et al. 2018

Day 1 Tue, March 27, 2018

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Swellable packer evaluation has become a critical component of Greater Prudhoe Bay (GPB) well design, surveillance and diagnostic strategy. Currently in the field there are several wells constructed with cementless completions with over 500 water or oil swellable packers across three different reservoirs. Several early gas or water breakouts have been documented since these types of completions have been deployed and the need for an accurate diagnostic technique to distinguish between a reservoir phenomenon or a completion failure motivated this work. The borax evaluation technique historically has been successfully used in oil fields on the North Slope of Alaska to detect fluid channeling mainly in horizontal cemented and perforated wells. This technique however, was never used to evaluate swellable packers in horizontal cementless completions. Even when the same multi-detector pulsed neutron (MDPN) instrument could be used in real time or memory conveyance to evaluate either one, there are fundamental differences in how these cementless completions are designed and evaluated compared to the cemented and perforated ones. Ignoring those differences could lead to the wrong nuclear attribute selection and incorrect interpretations, diagnostics and remediation strategies. The objective of this paper is to describe the nuclear modelling performed, the wellsite procedures used, the interpretation workflow, and the results of evaluations of these completions.

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Nuclear Attribute and Tool Modelling for Enhancing Reservoir and Well Surveillance (Russian)

Cited by 4 publications

References 7 publications

New Applications of Multidetector Pulsed Neutron Technologies in Gravel Pack Completions

New Applications of Multidetector Pulsed Neutron Technologies in Gravel Pack Completions

Nuclear Attributes Selection and Utilization to Address ACG Late Field Development Challenges

Swellable Packer Evaluation Using Multi-Detector Pulsed Neutron Logging and Borax

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