Method for intelligently determining hydrate drilling and production risks based on fuzzy judgment

Abstract

A method for intelligently determining hydrate drilling and production risks based on fuzzy judgment. First classifying monitoring parameters in a hydrate drilling and production process into layers from top to bottom: a target layer, a primary evaluation factor layer and a secondary evaluation factor layer; then calculating relative weight values of each primary evaluation factor and each secondary evaluation factor contained therein; then connecting in series the relative weight values of the primary evaluation factors with the relative weight values of the secondary evaluation factors to obtain an overall weight value of the secondary evaluation factors; repeating the foregoing steps; finally constructing the overall weight value of each secondary evaluation factor of each risk into a column vector to obtain a comprehensive determining weight matrix of hydrate drilling and production risks, and determining the risks in the hydrate drilling and production process by combining monitoring parameter change vectors.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]Not applicable.STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT[0002]Not applicable.NAMES OF THE PARTIES TO A JOINT RESEARCH AGREEMENT[0003]Not applicable.INCORPORATION-BY-REFERENCE OF MATERIALS SUBMITTED ON A COMPACT DISC[0004]Not applicable.TECHNICAL FIELD[0005]The present invention relates to the technical field of intelligent judgment and research on natural gas hydrate drilling and production risks, and in particular to a method for intelligently determining hydrate drilling and production risks based on fuzzy judgment.BACKGROUND[0006]Natural gas hydrate is a non-stoichiometric clathrate crystal substance generated by water and natural gas in a high-pressure and low-temperature environment. It is unconventional energy with high density and high heat value, mainly distributed in marine and terrestrial permafrost sediments. The amount of marine natural gas hydrate resources is about 100 times that of terrestrial permafro...

AI Technical Summary

Benefits of technology

The present invention provides a method for monitoring and determining risks in hydrate drilling and production through a fuzzy analytic hierarchy process. This method allows for real-time monitoring and quick and accurate identification of risks, ensuring the safety of the production process. The method is simple and convenient to operate and can help fill the gap in the intelligent determination of risks in hydrate drilling and production.

Problems solved by technology

For such a huge amount of resources, the drilling safety of natural gas hydrate reservoirs has become a major problem that restricts the development of a natural gas hydrate drilling and production technology.

Hydrate drilling and production are often faced with eight types of risks, which are formation gas production, borehole instability, hydrate production, drill string fracture, H2S production, sticking, bit balling and piercing-caused leakage of a drilling tool.

Basic risk monitoring and judgment methods have been established in the drilling process of conventional oil and gas reservoirs, but the methods are not perfect.

At present, no scholars have proposed a method for determining risks in the natural gas hydrate drilling and production process.

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