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Pulse neutron double spectrum tracing remaining oil saturation logging method

A technique of pulsed neutrons and saturation, which is applied in measuring devices, geophysical surveys, nuclear radiation exploration, etc., and can solve the problems of large amount of tracer and many solutions

Active Publication Date: 2008-03-05
XIAN AOHUA ELECTRONICS INSTR +1
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Problems solved by technology

[0023] The purpose of the present invention is to provide a pulsed neutron bispectrum-tracer that utilizes all information generated at each stage of the whole process of neutron-formation interaction, limits the multiple solutions of geophysical methods, and reduces tracer consumption and operating costs. Remaining oil saturation logging method to solve the technical problems of missing information, large multi-solution, and large amount of tracer that cannot be solved by existing logging methods

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  • Pulse neutron double spectrum tracing remaining oil saturation logging method
  • Pulse neutron double spectrum tracing remaining oil saturation logging method
  • Pulse neutron double spectrum tracing remaining oil saturation logging method

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Embodiment Construction

[0086] The core technology of the present invention is to use the pulsed neutron dual-spectrum saturation logging tool to collect three groups of thermal neutron and captured gamma dual-time spectra respectively in the cased well before gadolinium penetration, after gadolinium penetration and after gadolinium extrusion. The comprehensive processing can obtain the remaining oil and gas and water saturation with high accuracy.

[0087] Below with water-soluble gadolinium tracer as example, illustrate the concrete steps of the inventive method:

[0088] 1. Calculate the target concentration, preparation concentration and total dosage of the water-soluble gadolinium tracer.

[0089] Gadolinium Gd belongs to the yttrium group element among the rare earth elements. There are 7 nuclides in natural Gd, among which 155 Gd and 157 The cross-section of Gd capture radiation nuclear reaction is particularly large, and the neutron characteristics of gadolinium element are mainly determin...

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Abstract

The method comprises: a) before infiltrating the tracer agent into the target layer, using a pulsed neutron dual-spectrum saturation logger to collect the well logging base value data; 2) infiltrating the tracer agent containing Gadolinium into stratum, and measuring the data after infiltration; 3) making the tracer to squeeze into the stratum, and measuring the data after squeezing; 4) processing and explaining the data.

Description

technical field [0001] The invention relates to a pulse neutron bispectrum-tracing well logging method. Background technique [0002] The basis for thermal neutron lifetime logging to distinguish oil and water layers is that the thermal neutron macroscopic capture cross section of formation water is larger than that of crude oil. Under the same conditions, the larger the capture cross section, the higher the water saturation. [0003] The macroscopic cross-section of pure formation thermal neutrons is: [0004] ∑=∑ ma (1-+)+∑ w S w +∑ h (1-S w ) (1) [0005] In the formula, ∑ ma , ∑ w and ∑ h are the thermal neutron macroscopic capture cross-sections of the rock skeleton, formation water and oil and gas, respectively,  is the porosity, S w is the water saturation. The unit of macroscopic capture cross section is c.u., lc.u.=10 -3 cm -1 . [0006] If the macroscopic cross-section of crude oil is ∑ h =21c.u., while the macroscopic section of formation w...

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Application Information

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IPC IPC(8): G01V5/10
Inventor 黄隆基张锋房文静汪永安杨联会张德民杨连会董谦石丽云
Owner XIAN AOHUA ELECTRONICS INSTR
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