Stratum density measuring while drilling instrument based on deuterium-tritium accelerator neutron source

A technology of measuring while drilling and formation density, applied in the field of measuring while drilling and density logging while drilling, can solve the problems of low measurement result accuracy, influence density measurement accuracy, radioactive source pollution, etc., and solve the problem of low density measurement accuracy , Improve the measurement accuracy and reduce the effect of reducing radioactive hazards

CN104747179AInactive Publication Date: 2015-07-01CHINA PETROCHEMICAL CORP +1
8 Cites 9 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2015-07-01
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention provides a stratum density measuring while drilling instrument based on a deuterium-tritium accelerator neutron source. The stratum density measuring while drilling instrument is used for measuring the density of a stratum around a well hole in the well drilling process, and meanwhile can measure the neutron porosity. According to the stratum density measuring while drilling instrument, a U-shaped groove is formed in one side of a drill collar, a fast neutron monitoring detector and a neutron generator are arranged inside a neutron generator module compression resistance cylinder, a neutron shielding body, a first thermal neutron detector, a neutron shielding body, a second thermal neutron detector, a gamma ray shielding body, a gamma detector and a control processing circuit are sequentially installed inside a detector installation skeleton from top to bottom, and the neutron generator module compression resistance cylinder and the detector installation skeleton are connected and fixed into the U-shaped groove through a coupling connector. The stratum density measuring while drilling instrument adopts the deuterium-tritium accelerator neutron source for measuring the stratum density, a chemical gamma radioactive source is prevented from being used, damage to people and environment is eliminated, and the measuring precision is effectively improved by monitoring the neutron yield in real time.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to the technical field of oil drilling and well logging, in particular to the density logging while drilling technology. Specifically, it is a measurement-while-drilling instrument based on the formation density of a deuterium-tritium accelerator neutron source. Background technique

[0002] In the field of measurement while drilling in the drilling industry, the density logging tool is used to measure the density of the formation in real time during the drilling process, so as to effectively calculate the porosity of the formation, identify oil and gas layers, and calculate the oil storage capacity of the formation.

[0003] Currently known density measuring devices, one is to use a radioisotope source (for example, 137 Cs or 60 Co) emit gamma rays, and then use two gamma ray detectors at different source distances to measure the gamma rays scattered by the formation Compton, and calculate the density value of the formation acc...

Examples

Embodiment Construction

[0028] Now combined with the manual figure 1 , 2 and 3, the present invention is further described.

[0029] figure 1 Represents an axial section view of the instrument. The drill collar 1 is used as the installation skeleton of the instrument, and is a part of the downhole drilling tool, located behind the drill bit or the deflection tool. A U-shaped groove 15 is opened on the side of the drill collar 1, and the generator module anti-pressure cylinder 5 and the detector module installation frame 14 are installed from top to bottom in the U-shaped groove 15, and their wall thickness should meet the high pressure resistance of downhole mud According to the requirements, the wire hole 2 is set to lead to the U-shaped groove 15. The fast neutron monitoring detector 3 and the neutron generator 4 are installed in the anti-pressure cylinder 5 of the neutron generator module from top to bottom, and the neutron generator 4 adopts a deuterium-tritium reaction accelerator neutron so...