Calibration device and method for downhole supercritical carbon dioxide flowmeter

Abstract

The invention relates to an underground supercritical CO 2 Flowmeter calibration device and method, the calibration device adopts a skid-mounted structure, one end is connected to the pumping system, and the other end is connected to the gas injection wellhead; the steps of the on-site calibration method are as follows: (a), access to the calibration device; (b), Determine the calibration pipeline; (c), standard flow collection; (d), downhole supercritical CO 2 Flow meter calibration. The calibration method and device solve the problem that the existing calibration system cannot simulate the real state of the downhole and can only be calibrated indoors, and realize the supercritical CO in the downhole intelligent gas distribution device. 2 On-line calibration of flowmeter without considering supercritical CO 2 collection weighing and recovery issues, raising the supercritical CO 2 The reliability of the flowmeter provides technical support for downhole fine stratified gas injection.

Description

technical field [0001] The invention relates to the field of downhole flow meters in oil fields, in particular to a downhole supercritical CO 2 Flow meter calibration device and method. Background technique [0002] Carbon dioxide flooding technology first originated in the 1950s. Compared with the traditional water injection development technology, this technology has many advantages. The carbon dioxide entering the oil layer can greatly increase the recovery of crude oil through dissolution, acidification, expansion, extraction, etc., and is widely used in the secondary development of oil fields. However, the general injection of carbon dioxide will rush along the direction of high permeability, causing gas channeling and making the oil layer unable to be effectively produced. Therefore, layered gas injection technology has been paid attention to. In order to realize the real-time monitoring and allocation of layered gas injection volume, an intelligent layered gas injec...

AI Technical Summary

Problems solved by technology

Due to the zero drift problem of the flowmeter, it needs to be calibrated regularly to ensure the accuracy of the measurement, but the existing CO 2 The flowmeter calibration system adopts the indoor weighing method. First, it can only simulate the calibration of the downhole state, not the real state calibration. Second, it can only be calibrated indoors. For the flowmeter that has been placed underground for a long time, it cannot be calibrated and can only be lifted. Calibrate later

Such as: supercritical CO 2 The flowmeter calibration device and its calibration method (Patent No. ZL201410828130.4) are characterized in that they can achieve calibration in a supercritical environment, but only simulated calibration, not in real well conditions, and can only be calibrated indoors. CO 2 The flowmeter is powerless; a flow verification system and its verification method (Patent No. ZL201310135827.9), which is characterized by a temperature and pressure control system, but the supercritical state cannot be realized at the position of the flowmeter to be calibrated, and the supercritical state calibration cannot be realized , the same can only be calibrated indoors

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