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Determination of oil reservoir wettability using nuclear magnetic resonance testing of shaft

A nuclear magnetic resonance and wettability technology, which is applied in the measurement, magnetic resonance measurement, and electron magnetic resonance/NMR detection using nuclear magnetic resonance imaging system. issues of authority

Inactive Publication Date: 2006-08-30
SCHLUMBERGER OVERSEAS SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Reservoir wettability measurements derived from laboratory measurements are not authoritative because it is not possible to accurately simulate reservoir conditions in the laboratory

Method used

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  • Determination of oil reservoir wettability using nuclear magnetic resonance testing of shaft
  • Determination of oil reservoir wettability using nuclear magnetic resonance testing of shaft
  • Determination of oil reservoir wettability using nuclear magnetic resonance testing of shaft

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Embodiment Construction

[0021] Embodiments of the invention relate to methods for determining the wettability of reservoir rock under downhole conditions. The method according to the invention involves two sets of NMR measurements: one set is obtained from formation fluids within the reservoir rock in the soil formation and the other set is obtained from formation fluids taken from the reservoir rock, for example using a fluid testing tool. The removed fluid sample is preferably maintained under substantially the same conditions (eg, the same pressure and temperature) as it was in the soil formation. The first set of measurements can be made with any NMR logging tool, whether a wireline tool or a measurement-while-drilling (MWD) tool, while the second set of measurements can be made using conventional formation fluid Formation fluid samples taken by the test tool are taken by any formation fluid test tool with an NMR module or laboratory NMR instrumentation. Examples of wireline NMR tools include th...

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Abstract

A method for determining downhole reservoir wettability includes acquiring a first set of NMR measurements of formation fluids in earth formations at a selected axial depth; inverting the first set of the NMR measurements to produce a first distribution of a spin relaxation parameter for a fluid component in the formation fluids; acquiring a second set of NMR measurements of a formation fluid sample removed by a formation fluid testing tool at the selected axial depth, the formation fluid sample being kept at a substantially same pressure and temperature as those of the formation fluids in the earth formations at the selected axial depth; inverting the second set of NMR measurements to produce a second distribution of the spin relaxation parameter for the fluid component in the formation fluid sample; determining the reservoir wettability from a comparison of the first and second distributions of the spin relaxation parameter.

Description

technical field [0001] This application claims priority to US Provisional Patent Application No. 60 / 382,786 to Freedman and Huerlimann, filed May 23, 2002, entitled "Determining Reservoir Wetness Using Wellbore Nuclear Magnetic Resonance Measurements." [0002] The invention relates to the field of well logging. More specifically, the present invention relates to methods for determining the wettability of oil reservoirs using nuclear magnetic resonance data. Background technique [0003] Wettability is the tendency of a fluid to spread out on a solid surface and preferably adhere to or "wet" a solid surface in the presence of other immiscible liquids. Knowing reservoir wettability is important to reservoir and production engineers because reservoir wettability affects reservoir properties such as residual oil saturation, relative permeability, and capillary pressure. This can be seen in F.G. Craig's 1971 article "Discussion of Reservoir Engineering for Waterflood Developme...

Claims

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Application Information

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IPC IPC(8): G01V3/32G01R33/44G01R33/50
CPCG01N24/081G01V3/32G01R33/50
Inventor R·弗雷曼M·D·胡尔利曼
Owner SCHLUMBERGER OVERSEAS SA