Method for judging fluid type of reservoir by utilizing logging data of while-drilling drilling fluid

Abstract

The invention discloses a method for judging a fluid type of a reservoir by utilizing logging data of while-drilling drilling fluid, which comprises the following steps of: A, data collection, i.e., collecting performance parameters of the while-drilling drilling fluid of a target stratum, wherein the performance parameters comprise electrical conductivity, a temperature, drilling time and a hydrocarbon component of the drilling fluid; B, data processing; C, setting of a crossplot graph data track, i.e., for a plumb shaft, respectively combining an Sf data track and a Tf data track to form an S-T data track, combining the Sf data track and a DHf data track to form an S-DH data track and respectively making crossplots; D, judgment of the fluid type, i.e., using the S-T dat track for judging a dry layer (a micro gas-bearing bed) and an aqueous layer, using the S-DH data track for the plumb shaft to judge the gas-bearing bed or a gas reservoir and using a DO-DH data track for judging an oil-bearing formation or the gas-bearing bed. When the method is adopted, an explanation result of the method is objective and accurate, the coincidence rate of the explanation result and the oil testing conclusion is high, and the requirements on production and research can be met.

Description

[0001] technical field [0002] The present invention relates to the application field of mud logging data processing technology while drilling in the field of oil and gas industry exploration and development, especially in the process of drilling, using various parameters of drilling fluid recorded by comprehensive mud logging instruments to distinguish the reservoir type and fluid properties of the formation method. Background technique [0003] In the process of exploration and development of oil and gas fields, logging while drilling data can highlight the characteristics of timely, efficient and comprehensive, and can relatively truly reflect the original state of formation uncovered. [0004] The drilling process is a process in which the wellbore drilling fluid and the formation fluid material exchange and gradually reach a relative equilibrium, during which a series of physical and chemical properties of the fluid in the wellbore change. At the same time, the format...

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Problems solved by technology

[0006] Although it also mentions LWD-based logging while drilling and gas logging, and collects depth, drilling time, total hydrocarbons, hydrocarbon components (C 1 ~C 5 ), non-hydrocarbon components, dc index, Sigma value, drilling fluid density, etc., and the main methods for identifying reservoirs are drilling time ratio method and dc index difference method, which still have the following technical defects: in the prior art, only It is the value of various comprehensive logging items collected, but does not use the changes in the measured values ​​of drilling fluid performance, does not perform data processing on the collected drilling fluid logging data, and does not perform data processing on various data processed Drilling fluid logging data is set up with cross-chart data channels, so the interpretation results are relatively subjective, and the interpretation results and oil testing conclusions have a low load rate, which cannot meet the needs of production and research

[0007] Secondly, from the perspective of data sources, although there are many existing technologies represented by the above-mentioned journals and literatures that use mud logging parameters for reservoir evaluation, the core issue of the complex gas-water relationship in carbonate formations is The logging-while-drilling evaluation methods are lackluster, especially the rapid judgment of fluid properties in carbonate formations. Even with logging-while-drilling LWD technical equipment and methods, it is still a worldwide problem. A low-cost, convenient, intuitive, and effective rapid evaluation technology for team deployment conditions

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