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Application of neutron activation method in oil field well logging

A neutron and oilfield technology, applied in the direction of measurement, measurement devices, wellbore/well components, etc., can solve problems such as casing deformation, accidents, inaccurate test conclusions, etc., and achieve the effect of extending the release period

Active Publication Date: 2021-06-04
四川松云科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Traditional instruments go downhole by their own gravity, and it is difficult for the instrument string to continue moving after reaching the vicinity of the deflection; for this reason, Schlumberger specially designed the MaxTRAC crawler, which drags the signal cable and power cable, and carries the instrument The string enters the horizontal section; but once the horizontal section is relatively long, or the wellbore trajectory is tortuous and undulating, or there is casing deformation, it is easy to cause the crawler to be blocked, or even get stuck in the horizontal section, causing accidents;
[0005] 2) Problems with production testing
[0006] Traditional instruments go downhole with cables. Due to the existence of instruments and cables, it is necessary to use unconventional methods such as gas lift to lift the production liquid to the surface, causing the liquid to flow, thereby measuring parameters; these measures have objectively changed the entire horizontal section. The flow environment is easy to cause deviations between the test data and the real data in normal production, resulting in inaccurate test conclusions;
[0007] 3) Adaptation to harsh underground conditions
[0008] The interior of the traditional instrument is mainly composed of electronic devices, which are most suitable for working in a normal temperature environment; when the instrument works for a long time in a high-temperature environment underground, there may be problems with the drift of the instrument’s working point, and may even cause instrument failure

Method used

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  • Application of neutron activation method in oil field well logging
  • Application of neutron activation method in oil field well logging
  • Application of neutron activation method in oil field well logging

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0101] The general procedure for testing the fluid production profile of a horizontal oil well is as follows.

[0102] 1) Design of downhole release device deployment plan: determine which downhole fluid production conditions should be paid attention to according to well conditions, and count the number of layers and the specific positions of the front and rear ends of each layer (near the bottom of the well is the front end, and away from the bottom of the well for the backend). A release device is to be deployed at the back end of each concerned interval, and the number of concerned intervals is the number of release devices that need to be deployed. Such as figure 2 As shown, for example, it is necessary to measure 5 intervals, and it is necessary to deploy 5 release devices to the back end of each interval.

[0103] 2) Factory production: According to the above, it is necessary to measure the liquid production of 5 layers, first form 5 kinds of solid oil-based markers a...

Embodiment 2

[0113] Example 2 Water-seeking test for high water-cut level oil wells

[0114] For high water-cut wells, if there is still a small amount of oil production, it is necessary not only to find out the main water-production interval, but also to find the oil-production interval. The traditional water-seeking test method mainly focuses on the main water-producing layer, but in reality, if the main water-producing layer is accompanied by a small amount of oil production, then the main water-producing layer is blocked according to the test conclusion, and the result may be water plugging It stopped, and a small amount of oil was also blocked. Therefore, if the main oil-producing section of the well can be given at the same time as the main water-producing section, it will provide more comprehensive basic data for the subsequent comprehensive management.

[0115] Such as figure 2 As shown, for a high water-cut horizontal well with 5 intervals, it is planned to deploy 5 release dev...

Embodiment 3

[0120] Example 3 Full life cycle production monitoring of horizontal wells

[0121]For horizontal oil wells, the technology of this patent application can be used to implement the production monitoring of the entire life cycle, that is, to monitor the liquid production of each section of the horizontal well, including the flow rate of each section, the ratio of oil to water, and as the production progresses, the production layer trend of change. Mastering this information at any time will provide complete basic data for the scientific decision-making of production management and maintenance programs of horizontal wells.

[0122] Such as figure 2 As shown, a horizontal well that has just been completed, or a horizontal well that has been in production for many years, has a total of 5 intervals. It is necessary to monitor the fluid production of each interval for a long time. At the back end of each interval ( A release device is deployed on the layer away from the bottom of ...

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Abstract

The invention discloses application of a neutron activation method in oil field well logging. The application comprises the following steps that a series of marking elements are made into a measuring marker, a releasing device provided with the measuring marker is conveyed to a preset position through an oil pipe, and produced liquid is made to make contact with the surface of the measuring marker; when the produced liquid flows through the releasing device, the measuring marker in the releasing device is released along with the produced liquid, the produced liquid with the released measuring marker is sampled, and a sample is obtained; the sample is subjected to irradiation treatment, the marking elements are activated into isotopes with the atomic weight increased by one unit, and a to-be-detected sample is obtained; and the to-be-detected sample is subjected to gamma ray measurement, and the content of the marking elements in the oil well detection sample can be obtained, wherein the measuring marker is one or two of a water-based marker and an oil-based marker made of the marking elements. According to the application, by selecting the markers and adopting trace analysis, the proportion of water to crude oil in the produced liquid at all target positions under a well can be accurately restored.

Description

technical field [0001] The application relates to the field of oilfield exploitation, especially the field of underground measurement of oilfield exploitation, specifically the application of a neutron activation method in oilfield well logging. More specifically, this application relates to the application of the neutron activation method in the determination of oil and water content in oilfield logging. Through the selection of markers and the use of trace analysis, it can accurately restore the water and water in the production fluid at each target location downhole. ratio of crude oil. Background technique [0002] Fluid production profile testing of horizontal oil wells is a difficult problem in the field of petroleum logging, which involves the following aspects: [0003] 1) Accessibility problem [0004] Traditional instruments go downhole by their own gravity, and it is difficult for the instrument string to continue moving after reaching the vicinity of the deflec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/00E21B47/053E21B49/08G01N23/222G01N23/2202
CPCE21B47/00E21B49/08G01N23/222G01N23/2202G01N2223/0745
Inventor 刘建赵燕梅梅坚任丽容
Owner 四川松云科技有限公司