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Method for quantitatively calculating integrated risks of shaft integrity

A comprehensive risk and quantitative calculation technology, applied in calculation, instrumentation, data processing applications, etc., can solve problems such as the complexity of wellbore, the difficulty of evaluating the risk of wellbore integrity, and the lack of comprehensive evaluation of multi-factor wellbore, so as to eliminate potential safety hazards Effect

Inactive Publication Date: 2017-11-28
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

For wellbore integrity risk assessment, qualitative analysis method is widely used at present, only relying on the professional experience of experts to determine the weight of wellbore integrity risk factors often has certain limitations; in addition, due to the randomness of wellbore integrity risk It is very difficult to evaluate the risk of wellbore integrity because of its complexity and complexity, and most scholars only study on a single factor, but seldom comprehensively evaluate multi-factor wellbore risks

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  • Method for quantitatively calculating integrated risks of shaft integrity
  • Method for quantitatively calculating integrated risks of shaft integrity
  • Method for quantitatively calculating integrated risks of shaft integrity

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Embodiment Construction

[0042] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0043] Such as figure 1 As shown, a quantitative calculation method for comprehensive risk of wellbore integrity includes the following steps:

[0044] Step 1: First, investigate and analyze the failure mode of the wellbore in the operation stage of oil and gas wells, and discuss the causes of the failure mode. In addition, study the factors that cause the failure of the wellbore integrity from the aspects of production management and operation;

[0045] Step 2: Analyze the severity of each type of wellbore integrity damage and grade it;

[0046] Step 3: Use the method of probability theory and expert experience to determine the probability of wellbore integrity damage induced by each qualitative and uncertain factor;

[0047] Step 4: Use the differen...

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Abstract

The invention discloses a method for quantitatively calculating integrated risks of shaft integrity. The method comprises the following steps of: analyzing failure forms of shafts, discuss failure inducements and researching factors inducing the failures; analyzing severity degrees of shaft integrity damages and carrying out grading; determining probabilities of inducing shaft integrity damages by certain and uncertain factors; calculating risk grades of evaluation factors; carrying out risk sequencing on possibilities of different shaft integrity damage conditions; comparing importance of indexes in shaft shield risk factors; and carrying out integrated risk evaluation on the shaft integrity by utilizing a risk matrix method. The method has the advantages that only single risk factors are analyzed and the boundedness of shaft integrity failure risk factors is determined by means of professional experiences of experts, so that the discrimination of shaft key risks can be instructed preferably, the potential safety hazards can be decreased or eliminated in time, and the shaft safety during the operation can be ensured.

Description

technical field [0001] The invention relates to the technical field of oilfield safety production management, in particular to a quantitative calculation method for comprehensive risk of wellbore integrity. Background technique [0002] "Wellbore integrity" is defined as "the technical, operational and compositional measures that are in place to reduce production risks to ensure the safety of a well throughout its life". Wellbore integrity runs through the entire life cycle of oil and gas well design, drilling, oil testing, completion, production, workover, and disposal. The key technology is to ensure that effective barriers must be established at each stage of the well life cycle. During the entire life cycle of oil and gas wells, once the integrity fails, it may lead to serious or even catastrophic consequences such as leakage and blowout. Wellbore integrity evaluation is an important part of oil and gas field management. How to evaluate wellbore integrity reasonably, di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/06G06Q50/02
CPCG06Q10/0635G06Q50/02
Inventor 张智张乃艳刘志伟何雨杨昆
Owner SOUTHWEST PETROLEUM UNIV
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