Measuring and calculating method of upwelling speed of oil gas

Abstract

The invention discloses a measuring and calculating method of the upwelling speed of oil gas. The method is obtained by improving a common late time method serving as a basis, wherein the improvements comprise an improvement on a parameter measuring, calculating and solving method and an improvement on a measuring and calculating formula; according to the method, automatic measurement and calculation are realized by compiling measuring and calculating statements by virtue of Microsoft EXCEL.EXE software. According to the method, the problems that the measurement of parameters is insufficiently accurate, and the design of the formula is insufficiently rigorous existing in the traditional late time method are solved, the accuracy of measurement and calculation of the upwelling speed of the oil gas is improved, and important significance for improving drilling facilities and the safety of persons is realized.

Description

technical field [0001] The invention belongs to the technical field of geophysical exploration, and in particular relates to a method for measuring and calculating the upward channeling velocity of oil and gas. Background technique [0002] After the oil and gas layer is uncovered, the drilling is stopped for some reason. During the tripping process or the static time, if the bottom hole pressure is lower than the formation pressure, the oil and gas will enter the wellbore and go up. Observe whether the oil and gas in the formation enter the wellbore through the method of measuring the aftereffect, so as to adjust the performance of the drilling fluid in time and ensure the safety of drilling. The specific method is to drill down to the bottom after a period of rest, circulate the drilling fluid, and observe the return of mud from the wellhead. If there is an indication of oil and gas return (for example: there are oil flowers or gas in the mud) or the density of the mud dro...

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Problems solved by technology

Under the existing calculation method of oil and gas upward channeling velocity, the safety of well control operation is affected to a certain extent due to the difference of oil and gas well fluid, wellbore and drilling tool assembly, etc.

[0008] Through in-depth research, five methods for calculating the upward channeling velocity of oil and gas were summarized, and the applicable conditions and calculation formulas corresponding to each calculation method were respectively defined. The advantages and disadvantages of each method are as follows: the late arrival time method and the However, the two methods are affected by the circulating displacement of the mud pump, pump stop midway, and gas rise and slippage. The volume method is also affected by the diameter expansion rate of the open hole section; However, it is affected by the enlargement rate of well diameter, displacement, and stopping the pump midway; the total hydrocarbon time method and the density time method are interoperable, that is, the increase and decrease of the total hydrocarbon display affect the change of the drilling fluid density, and the two methods Not only is it simple, but also can be compared with each other. The total hydrocarbon time method makes up for the error when measuring the drilling fluid density, and the density time method makes up for the instrument transmission time difference of the total hydrocarbon time method; The impact of diameter enlargement rate, displacement volume of drilling tools with check valves, pump displacement, and midway pump reversal can be visually judged whether the requirements for tripping out are met. However, this method has the disadvantage of taking a long production time. In order to overcome the The shortcomings of these methods are based on the most commonly used late time method, and the improved late time method is finally obtained after research

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