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Method for actively detecting lost circulation by using radioactive indicators

An active detection and indicator technology, applied in the field of oil and gas exploration, can solve the problems of extended construction period, lack of timeliness, increased drilling cost, etc., and achieve the effects of fast lost circulation, direct location and short delay time

Active Publication Date: 2020-02-28
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If it is necessary to determine the location of lost circulation, instrument measurement methods are often used, such as spiral flow meter method, well temperature measurement method, resistivity measurement method, etc. These methods generally lack timeliness, which will greatly prolong the construction period and increase drilling costs

Method used

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  • Method for actively detecting lost circulation by using radioactive indicators
  • Method for actively detecting lost circulation by using radioactive indicators
  • Method for actively detecting lost circulation by using radioactive indicators

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Embodiment Construction

[0017] Hereinafter, the method for actively detecting lost circulation by using a radioactive indicator according to the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0018] One aspect of the present invention provides a method for actively detecting lost circulation using a radioactive indicator. In an exemplary embodiment of the method for actively detecting lost circulation using a radioactive indicator of the present invention, as shown in figure 1 As shown, the method for detecting lost circulation may include:

[0019] S01, adding a radioactive indicator to the drilling fluid while drilling and controlling the content of the radioactive indicator in the drilling fluid;

[0020] S02, respectively setting a first gamma value detection point and a second gamma value detection point at the end of the drill tool near the drill bit along the opposite direction of drilling;

[0021] S03, the first gamma v...

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Abstract

The invention provides a method for actively detecting lost circulation by using radioactive indicators. The method comprises the following steps that the radioactive indicators with predetermined content are added to drilling fluid while drilling; a first gamma value detection point and a second gamma value detection point are arranged sequentially along the opposite direction of drilling at near-bit end of a drilling tool; the first and second gamma detection points respectively detect the gamma values of the radioactive indicators of different well depths in formation to be detected, according to the change conditions of the detection values of the first and second gamma detection points in the same well depth, whether lost circulation exists in the well depth or not is judged; and theleakage position of the drilling fluid while drilling is calculated. According to the method for actively detecting lost circulation by using radioactive indicators, the active detection of the lost circulation position can be realized, and the speed finding the lost circulation is fast and the delay time is short.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration, in particular to a method for actively detecting lost circulation by using a radioactive indicator. The present invention is especially suitable for the drilling fluid that is exposed to the mixed fluid system filled with drilling fluid and formation fluid after being cut and broken by the drill bit during the drilling process. Drilling fluid breaks away from the mixed fluid system and enters the formation through the cutting surface due to pressure difference, and loses control of the drilling fluid circulation system. In case of ground leakage. Background technique [0002] The phenomenon that drilling fluid loses into formations or other interlayers through exposed formations or missing and damaged casings during drilling and completion is collectively referred to as drilling fluid loss, or lost circulation for short. [0003] Well wall instability, leakage-induced collapse, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/11E21B47/113E21B47/013
CPCE21B47/01
Inventor 杨孛伍翊嘉赵磊赵辉任兴国戴勇
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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