Neutron yield control method and device for while-drilling neutron porosity measurement

A technology of neutron porosity and control method, which is applied in neutron porosity measurement while drilling, natural gas drilling, and petroleum fields, and can solve problems such as unstable and uncontrolled neutron production

Active Publication Date: 2016-07-27
BC P INC CHINA NAT PETROLEUM CORP +2
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Problems solved by technology

[0006] In consideration of the above shortcomings of the prior art, the inventors of the present application have proposed a neutron yield control method and device for a neutron porosity measurement device while drilling, which has solved the problem of unstable neutron yield within the specified measurement time and Uncontrolled issues to ensure and improve the accuracy of formation porosity measurements

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  • Neutron yield control method and device for while-drilling neutron porosity measurement

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Embodiment Construction

[0013] Below, the implementation of the technical solution will be further described in detail in conjunction with the accompanying drawings.

[0014] Those skilled in the art can understand that although the following description involves many technical details related to the embodiments of the present invention, this is only an example for illustrating the principle of the present invention, and does not imply any limitation. The present invention can be applied to occasions other than the technical details exemplified below, as long as they do not deviate from the principle and spirit of the present invention.

[0015] In addition, in order to avoid making the description in this manual limited to redundant, in the description in this manual, some technical details that can be obtained in the existing technical documents may be omitted, simplified, modified, etc. understandable to human beings, and this does not affect the adequacy of the disclosure of this specification. ...

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Abstract

The invention discloses a neutron yield control method for while-drilling neutron porosity measurement. The method comprises the following steps that 1, a current neutron yield is measured through a thermal neutron monitor; 2, if a difference value between the current neutron yield and a previous neutron yield exceeds a first threshold value, the needed neutron yield adjustment amount is calculated according to the difference value between the current neutron yield and the previous neutron yield and an expected neutron yield; 3, the expected supply voltage of a neutron generator is calculated according to the neutron yield adjustment amount and intrinsic parameters of the while-drilling neutron generator and the thermal neutron monitor, and then the supply voltage of the neutron generator is adjusted accordingly. According to the neutron yield control method, the stability and the reliability of the neutron yield of an accelerator neutron source are guaranteed, and therefore the accuracy and the authenticity of a while-drilling neutron porosity measurement result are achieved.

Description

technical field [0001] The present invention relates to the field of oil and natural gas drilling, in particular to the technical field of neutron porosity measurement while drilling in oil and natural gas drilling operations, and in particular to a neutron yield control method per unit measurement time for neutron porosity measurement while drilling and device. Background technique [0002] In the geosteering drilling system, the neutron porosity measurement device while drilling is responsible for the real-time acquisition of formation porosity parameters, which is one of the important basis for the precise steering of the geosteering drilling system. Therefore, the accuracy and reliability of underlying porosity parameters are the core measurement technology of neutron porosity measurement system while drilling. [0003] The neutron porosity measurement while drilling utilizes the physical principle of the interaction between neutrons and formations. The high-energy fast...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/12E21B17/16
CPCE21B17/16E21B47/12
Inventor 贾衡天盛利民艾维平曹冲王刚李万军周海秋彭浩吕海川
Owner BC P INC CHINA NAT PETROLEUM CORP
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