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Well leakage assessment method based on comprehensive index method

A comprehensive index, lost circulation technology, applied in seismology, seismology, instruments, etc. for logging records, can solve the problem of lack of effective technical support for lost circulation prevention and treatment, unsatisfactory lost circulation evaluation effect, and lost circulation geological Insufficient understanding and other problems, achieve high social and economic benefits, avoid misjudgment and missed judgment of lost circulation, and reduce operation risks.

Pending Publication Date: 2022-04-19
CNOOC TIANJIN BRANCH
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Problems solved by technology

The fourth factor is related to engineering and cannot be predicted in advance, so it will not be considered later
However, on the one hand, the use of seismic data to predict fractures is not accurate enough due to the influence of seismic data, which will lead to unsatisfactory results in evaluating lost circulation; There is a big difference in what happens
In addition, due to the lack of understanding of lost circulation geology for a long time, the prevention and treatment of lost circulation lack effective technical support

Method used

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  • Well leakage assessment method based on comprehensive index method
  • Well leakage assessment method based on comprehensive index method
  • Well leakage assessment method based on comprehensive index method

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Embodiment Construction

[0052] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0053] The present invention provides a method for innovatively analyzing fracture leakage based on a fuzzy mathematical evaluation model, see figure 1 , including the following steps:

[0054] Step 1, calculating crack parameters;

[0055] Use deep and shallow dual lateral logging to quantitatively calculate fracture density, dip angle, opening, porosity and permeability, etc., and complete statistics and analysis of fracture parameters from logging data. The depth and shallow resistivity data of the drilled well section are extracted, the fracture parameters are calculated by using the MATLAB programming method, and the calculation results are saved.

[0056] The existence of fra...

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Abstract

The invention discloses a well leakage assessment method based on a comprehensive index method. The well leakage assessment method comprises the steps that crack parameters are calculated; calculating rock mechanical parameters; selecting logging data; carrying out data normalization processing; calculating a well leakage risk by a comprehensive index method; and establishing a well leakage risk assessment model and a grading evaluation standard. According to the technical scheme, two main factors, namely, cracks and stratum fractures, influencing the well leakage are fully considered, the problem that a conventional method for predicting and evaluating the well leakage risk through seismic cracks is poor in effect is solved, and a well leakage comprehensive index risk evaluation model and a grading evaluation standard are established; the well leakage risk assessment method based on the comprehensive well leakage index can effectively assess low porosity, low permeability and high transverse heterogeneity of a reservoir and well leakage risks of a horizontal well drilling area, and provides a new means for well leakage assessment of field drilling of an oil field, especially optimization of a horizontal well drilling trajectory.

Description

technical field [0001] The invention belongs to the field of drilling engineering for petroleum exploration and development, and in particular relates to a method for evaluating the risk of lost circulation by combining rock mechanics parameters and fracture data. Background technique [0002] The invention provides a method for evaluating lost circulation risk based on a comprehensive index method, and relates to the field of oil exploration and development drilling engineering. Lost circulation is a technical problem in drilling engineering. The occurrence of lost circulation not only increases the cost of drilling operations, increases the risk of drilling operations, prolongs the drilling period, but also affects the progress of exploration and development. Therefore, how to predict lost circulation in advance is of great significance to ensure the safety of drilling construction and improve the efficiency of drilling operations. The main factors causing lost circulatio...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/50G01V1/46G01V1/36
CPCG01V1/50G01V1/46G01V1/362
Inventor 谭忠健邓津辉张向前袁亚东彭超王建立李鸿儒
Owner CNOOC TIANJIN BRANCH
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