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Non-radioactivity tracing flow well logging method and process based on pulse neutron technology

A technology of pulsed neutrons and radioactivity, applied in construction and other directions

Inactive Publication Date: 2013-09-25
PETROCHINA CO LTD +1
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Problems solved by technology

In the existing injection profile logging technology, isotope logging has a high risk of radioactive contamination, and contamination problems exist. At the same time, radioactive risks are inevitable in the transportation, storage and use of isotope tracers; tracer-related flow logging solves the contamination problem. There is still a risk of radioactivity; the risk of radioactivity in oxygen activation logging is small, but when the flow rate is 3 / d, the measurement error is large

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  • Non-radioactivity tracing flow well logging method and process based on pulse neutron technology
  • Non-radioactivity tracing flow well logging method and process based on pulse neutron technology
  • Non-radioactivity tracing flow well logging method and process based on pulse neutron technology

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Embodiment Construction

[0012] The present invention will be further described below in conjunction with accompanying drawing:

[0013] Depend on figure 1 figure 2 and image 3 As shown, the non-radioactive tracer flow logging method and process based on pulsed neutron technology uses high thermal neutron capture cross-section, non-radioactive substance gadolinium or boron compound solution as tracer, and uses neutron lifetime to measure fluid in the well The macroscopic capture cross-section, that is, the high-intensity pulsed neutrons emitted by the pulsed neutron generator are used to bombard the fluid in the well, the tracer flowing through the detector system has a capture reaction with the thermal neutrons, and the thermal neutrons from the detector with a fixed source distance are recorded For the peak value of abnormal changes in the time spectrum or thermal neutron count rate, the flow monitoring function can be realized by using the correlation flow calculation method.

[0014] The ins...

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Abstract

The invention relates to a non-radioactivity tracing flow well logging method and process based on the pulse neutron technology in the oilfield production injection profile well logging technology. The non-radioactivity tracing flow well logging method and process based on the pulse neutron technology includes the steps of using a solution of a non-radioactive substance, such as a gadolinium compound or a boron compound, with a high heat neutron capture cross section as a tracing agent, using the neutron lifetime manner to measure the macroscopic capture cross section of fluid in a well, namely using high-strength pulse neutrons emitted by a pulse neutron generator to bombard the tracing agent, capturing heat neutrons by the tracing agent, using different well logging processes to record heat neutron time spectrums or the heat neutron counting rate of a fixed spacing detector, and calculating the flow speed of the fluid in the well and the use conditions of a thin difference layer by analyzing well logging data. The non-radioactivity tracing flow well logging method and process based on the pulse neutron technology is free of radiation risks, meets the environment-friendly requirement, is low in measuring lower limit, effectively solves the problem that an current layering injection well is low in flow and large in monitoring error, and has wide site adaptability.

Description

technical field [0001] The invention relates to a non-radioactive tracer flow logging method and process based on pulsed neutron technology used in oil field production injection profile logging technology. Background technique [0002] With the continuous deepening of oilfield development and the further improvement of environmental protection awareness, the flow monitoring of layered injection wells encounters more and more difficulties. In the existing injection profile logging technology, isotope logging has a high risk of radioactive contamination, and contamination problems exist. At the same time, radioactive risks are inevitable in the transportation, storage and use of isotope tracers; tracer-related flow logging solves the contamination problem. There is still a radioactive risk; the oxygen activation logging radioactive risk is small, but when the flow rate is <10 m 3 / d, the measurement error is large. Invention content: [0003] In order to solve the abo...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/11
Inventor 马水龙李军孙亮唐海涛董建华梁庆宝
Owner PETROCHINA CO LTD
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