By Alun Whittaker (auth.), Alun Whittaker (eds.)

ISBN-10: 9027719802

ISBN-13: 9789027719805

ISBN-10: 9400953577

ISBN-13: 9789400953574

ISBN-10: 9401088632

ISBN-13: 9789401088633

This coring operations reference guide is meant as a realistic advisor for the logging geologist to methods, actions, and tasks required while bottomhole or sidewall coring is played on the wellsite. no longer the entire operations defined are universal perform in all logging devices; although, familiarity with them is an important a part of common ex­ ploration wisdom and professionalism. bankruptcy 1 discusses the ideas of porosity, permeability, and saturation, how those houses are made up our minds in center research, and their value in controlling rest:rvoir functionality. bankruptcy 2 offers with a number of the suggestions utilized in coring. bankruptcy three ex­ plains the regimen position of the logging geologist in center retrieval, sampling, and qualitative review. bankruptcy four information working tactics for quantitative wellsite middle research gear. 1 advent 1. 1 basic 1. 2 QUANTITATIVE middle research the first goal of coring is to procure rock samples of a adequate measurement to procure estimates of serious reservoir properties.

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Additional info for Coring Operations: Procedures for Sampling and Analysis of Bottomhole and Sidewell Cores

Example text

The orientation of these cracks shows no relationship to that of other rock features or texture. Examination of crack surfaces shows no evidence of movement, fluid flow, secondary deposition or healing. The cracks are, therefore, interpreted to be newly formed as a result of stress relief in retrieval of the core and not a true feature of the formation. Obtaining core plugs for porosity determination can be difficult. Plugs may break or contain cracks leading to falsely high porosities. Recent evidence from comparison of analyses from conventional and pressurized cores (see Section 2) indicates that the core cracking phenomenon is not limited to wellindurated rocks.

When approaching that depth, correlation with offset logs is attempted to pick a point as close as possible above the formation top. The most useful tools in picking tops in this way are unsmoothed drilling exponents, such as nx and dxc. These exponents have lithology and porosity dependent characters, minor but distinctive variations when plotted, allowing good correlation of overlayed plots from different wells. When plotted to a suitable scale, they also correlate well with offset sonic logs (see Figure 3-2).

I{emember that, offshore, wood is a rare commodity and wooden core boxes will need to be guarded. Onshore, Saran W rap and Aluminum Foil sometimes disappear on rig barbecue night. Note any shortages in supplies and send out reminders or reorders. 4 PICKING A CORE POINT The most common reason for bottomhole coring is to determine the reservoir characteristics of a known potential reservoir. Picking a core point is therefore a matter of normal stratigraphic correlation. The approximate depth of the top of the formation will be known.

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Coring Operations: Procedures for Sampling and Analysis of Bottomhole and Sidewell Cores by Alun Whittaker (auth.), Alun Whittaker (eds.)


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