Underground pressure real-time measuring and correcting method

Abstract

The invention relates to a real-time measuring and correcting method for underground pressure by a capillary steel pipe. A pressure measuring device for the method consists of an underground pressure diffusing cartridge, the capillary steel pipe, a pressure transmitter, a temperature transmitter and a data acquisition unit. The underground pressure diffusing cartridge is arranged underground, and is connected with the pressure transmitter on the ground through the capillary steel pipe; the underground pressure is transmitted to the ground through inert gases in the capillary steel pipe, and is converted into digital signals by the pressure transmitter; and the data acquisition unit acquires well head pressure signals of the pressure transmitter and environmental temperature signals of the temperature transmitter. The data acquisition unit corrects the well head pressure by utilizing parameters such as environmental temperature, normal temperature layer depth, temperature rise layer gradient, well logging depth, gas molar mass, and the like, and calculates the underground actual pressure. The pressure measuring device and a pressure correction algorithm can realize indirect measurement of the underground pressure of gas wells, improve the real time of the well logging process, facilitate the calibration and the maintenance of a sensor, improve the production efficiency in the oil production process, and guarantee safety production.

Description

technical field [0001] The invention relates to the technical field of automatic information processing, and relates to a method for real-time measurement and collection of downhole pressure in the production process of oil and gas wells. The indirect pressure measurement method realized by the principle of capillary steel pipe is used to obtain real-time downhole actual pressure data by using the downhole pressure correction method, which is suitable for Real-time monitoring of downhole pressure in the exploration, development and production of oil and gas wells. Background technique [0002] In the process of petroleum exploration and development, production personnel need to continuously perform dynamic tests of various oil and gas reservoirs, monitor and measure formation pressure parameters of oil and gas reservoirs in real time, and accurately evaluate oil field productivity based on these parameters, optimize the evaluation method of oil field productivity, and determi...

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Problems solved by technology

However, although the pressure measured at the wellhead has a certain relationship with the actual downhole pressure, the downhole pressure is affected by various conditions and parameters, and the change of the actual downhole pressure cannot be reflected only from the wellhead pressure.

In particular, formation temperature changes have a great influence on the properties of inert gases. The current capillary steel pressure measurement technology only measures the wellhead pressure value, not the formation temperature, and cannot calculate the accurate value of the downhole actual pressure. Therefore, oil and gas reservoir exploration and development and oil and gas Production is subject to certain constraints

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