Measurement unit and overflow information recognition device and method

Abstract

The embodiment of the invention provides a measurement unit and an overflow information recognition device and method, and belongs to the field of oil-gas well engineering. The measurement unit comprises a throttling device, sensors and a signal sending device, wherein the throttling device is used for being mounted on a drill rod; the sensors are located on the two sides of the throttling device and used for sensing the pressure and / or temperature of the two sides of the throttling device; and the signal sending device is used for sending the pressure and / or temperature. According to the measurement unit and the overflow information recognition device and method, the throttling device is adopted, the pressure drop and / or temperature difference between the position in front of the throttling device and the position behind the throttling device is measured, overflow information can be well recognized according to the pressure drop and / or the temperature difference, and an extremely good overflow information recognition effect still can be achieved on the occasion that the flow and pressure changes in a horizontal well are not obvious. In addition, the throttling device can monitor overflow and can also increase throttling pressure loss and friction pressure drop, rapid development of overflow is avoided, and the throttling device can assist in achieving control over the pressure of a shaft in the later stage.

Description

technical field [0001] The invention relates to the field of oil and gas well engineering, in particular to a measuring unit, overflow information identification equipment and a method. Background technique [0002] At present, the reservoir characteristics and wellbore structure of oil and gas well drilling are becoming more and more complex, and oil and gas overflow accidents occur frequently, which will lead to increased non-operation time and higher drilling costs. After drilling overflow occurs, formation fluid (oil, gas, water) invades the wellbore, mixes with the drilling fluid and migrates along the wellbore. If the overflow fluid is a gas, affected by changes in temperature and pressure environment, significant phase change, drift and expansion will occur during the migration process, posing severe challenges to wellbore pressure control. Therefore, timely identification and diagnosis of overflow information has become an important content to ensure drilling safety...

AI Technical Summary

Problems solved by technology

However, its applicability and timeliness will be greatly limited in horizontal well overflow diagnosis

First of all, during the migration of gas in the horizontal section, there will be no expansion, and the change of flow rate and pressure is not obvious, so it is difficult to directly measure and realize early identification; secondly, there will be formation fluid invasion at various positions in the entire horizontal section Based on the measurement data at the bottom of the well, the overflow information at the upper part of the well bottom cannot be judged in time

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