Stratified fluid monitoring and sampling device based on pressure pulse

Abstract

The invention discloses a stratified fluid monitoring and sampling device based on pressure pulse. A sampling device is arranged on the inner wall of a drilled hole or a sleeve and comprises a packer system, a liquid sample injection system, a gas sample injection system, automatic multi-way valves, a sampling system, a temperature control system and the like, wherein a pressure container in a pressure pulse system is connected with the valves and a pressure sensor through a pipeline for forming the pressure pulse system, the pressure pulse system is connected with the underground gas sample injection system through the automatic control multi-way valve, the liquid sample injection system is connected with the liquid automatic multi-way valve, and the gas sample injection system is connected with the gas automatic multi-way valve. The state of fluid in a stratum is judged by the pressure pulse, the underground fluid sampling horizon is simultaneously precisely controlled, respective sampling of gas and liquid fluids in different horizons under constant temperature and pressure conditions can be realized, the response rate of sampling is improved and precise sampling under the low flow rate condition can be particularly realized. The device is simple to assemble all the parts and suitable for monitoring the state of the multi-layer fluid in a bored well and sampling the underground gas and liquid two-phase fluid.

Description

Technical field [0001] The invention relates to the field of fluid sampling and monitoring in deep formations, and more particularly to a downhole fidelity sampling and monitoring device, which is suitable for fidelity sampling of underground fluids. Background technique [0002] Underground fluids (including petroleum, oil and gas, groundwater, gas reservoirs, saline water, shallow water and other underground fluids) survey work includes understanding the characteristics and geological conditions of underground fluids, fluid composition, concentration, distribution range and its underground environment The transmission status and changing trend of the fluid, as well as the potential harm of fluid to people’s health and living environment. Monitoring and sampling technology in underground fluid research is a very important technology in scientific research and engineering applications. Various companies and researchers attach great importance to various fluid sampling techniques...

AI Technical Summary

Problems solved by technology

This technical solution is very suitable for fidelity sampling of deep gas and liquid, but it cannot understand the state of subsurface multiphase fluid. In addition, because the internal space of drilling is very large, up to hundreds of liters to several cubic meters, the sampling volume is generally only a few liters to several cubic meters. Tens of liters, if it is too large, the distribution of underground fluid will be changed. When the device is in the state of low underground fluid flow rate, the data value obtained by sampling inside the borehole will be lagging and low, which cannot reflect the real underground fluid composition change, especially the fluid composition change. When the critical value is used for high-precision analysis, it cannot meet the sampling requirements

Under the condition of low flow rate, especially under the condition of very low gas saturation, when the sampling part is large relative to the available gas sample, the sampling device cannot obtain a suitable gas sample

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