Method for determining oil gas breakthrough time and moisture content stable time in pumping sampling

Abstract

The invention provides a method for determining the oil gas breakthrough time and the moisture content stable time in pumping sampling. The basic principle is that: using a specially-designed underground fluid monitoring module and a pumping module to analyze the property of pumped fluid in a process that a cable formation tester is used to perform pumping sampling on a target fluid, and extracting the instant moisture content and pumping state information; writing a program in a matlab to perform periodization treatment on the original instant moisture content to acquire the periodic averagemoisture content; and using a relevant mathematical algorithm to perform programming so as to achieve automatic picking of the oil gas breakthrough time and the moisture content stable time in a pumping process. Automatic accurate determination of the oil gas breakthrough time and the moisture content stable time in a pumping process can be achieved through data programming provided by the specially-designed underground fluid monitoring module and the pumping module; the method makes up a defect of the conventional methods that the oil gas breakthrough time and the moisture content stable timeare extracted artificially, can improve the working efficiency, and can greatly facilitate later analysis and research working.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration, in particular to a method for determining oil and gas breakthrough and water content stability time of downhole pump sampling. Background technique [0002] With the continuous improvement and development of cable formation testing technology, when evaluating oil and gas resources in offshore oil fields, cable formation testing can quickly obtain reservoir physical properties, pressure data and fluid samples, saving a lot of testing costs and reducing operational risks. It plays an increasingly important role in the process of oilfield exploration and development. At present, oilfield researchers and related service companies mostly use piezometric pressure, fluidity and sample test analysis results, etc., and lack of dynamic data such as flow pressure, flow rate, pumping volume, water cut and so on for downhole monitoring during the pumping process. analysis and application. Es...

AI Technical Summary

Problems solved by technology

At present, oilfield researchers and related service companies mostly use piezometric pressure, fluidity and sample test analysis results, etc., and lack of dynamic data such as flow pressure, flow rate, pumping volume, water cut and so on for downhole monitoring during the pumping process. analysis and application of

Especially in the pumping process of low-permeability reservoirs, the displacement efficiency of mud filtrate is low, and the pumping operation takes a long time. In offshore oilfields, it means more platform time and higher operating costs.

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