Apparatus and method for monitoring hydrate decomposition area under different drilling and production processes

摘要

The present invention relates to an apparatus and a method for monitoring a hydrate decomposition area under different drilling and production processes. The apparatus for monitoring hydrate decomposition area under different drilling and production processes comprises a reaction unit, an auxiliary unit and a determination unit; the reaction unit is used to simulate the hydrate storage layer environment, provide a place for generation and decomposition of a hydrate, simulate a hydrate heat-injection exploitation process, a hydrate pressure-reduction exploitation process and a hydrate CO2 displacement exploitation process, and also analyze the hydrate decomposition status at various areas by calculating the hydrate decomposition rate, thereby evaluating and optimizing the drilling and production process; the auxiliary unit is used to provide a gas source and a liquid source for the reaction unit, and simulate different hydrate drilling and production processes; and the determination unit is used to measure the hydrate decomposition rate in different drilling and production processes.

主权项

1. An apparatus for monitoring hydrate decomposition area under different drilling and production processes, comprising a reaction unit, an auxiliary unit and a determination unit, wherein the reaction unit is configured to simulate hydrate storage layer environment to provide a place for generation and decomposition of hydrate, to simulate a hydrate heat-injection exploitation process, a hydrate pressure-reduced exploitation process and a hydrate CO2 displacement exploitation process, and also to analyze hydrate decomposition status at various areas by calculating hydrate decomposition rate, so as to evaluate and optimize the drilling and production process; wherein the auxiliary unit is configured to provide a gas source and a liquid source for the reaction unit, and to simulate different hydrate drilling and production processes; and wherein the determination unit is configured to measure the hydrate decomposition rate in different drilling and production processes; wherein, the determination unit comprises: a pressure regulating valve, a gas-liquid separator apparatus, a closed liquid drainage container, a weighing apparatus, a pre-vacuumed thermal insulation gas storage cylinder, and a three-way valve; an air outlet is connected with the three-way valve through a transmission pipeline; a fourth pressure sensor and the pressure regulating valve are installed orderly on the transmission pipeline in a direction from the air outlet to the three-way valve; the fourth pressure sensor is configured to measure real-time pressure within the reactor when discharging gas; the pressure regulating valve is configured to be regulated to keep the real-time pressure within the reactor at a set of predetermined values; flow and flow direction of the fluid are controlled through the three-way valve; the gas-liquid separator apparatus is connected with the three-way valve; the three-way valve is configured to guide the discharged fluid to the gas-liquid separator apparatus for gas-liquid separation; a liquid hole is formed on a lower part of the gas-liquid separator apparatus; the liquid hole is connected with the third liquid storage container through the transmission pipeline; the third liquid storage container contains the separated liquid; an air hole is disposed on an upper end of the gas-liquid separator apparatus; the air hole is connected with a top end of the closed liquid drainage container through the transmission pipeline; the closed liquid drainage container is connected with the fourth liquid storage container through the transmission pipeline; the transmission pipeline stretches into an inner chamber of the closed liquid drainage container and approaches to bottom; the fourth liquid storage container is placed on the weighing apparatus; the weighing apparatus is connected with a computer data processing system; the closed liquid drainage container measures a volume of the gas after gas-liquid separation through a drainage process; the fourth liquid storage container contains water discharged through the drainage process; the weighing apparatus measures mass of the discharged water; the computer data processing system is used to collect, store and analyze the real-time mass data; the pre-vacuumed thermal insulation gas storage cylinder is connected with the three-way valve through the transmission pipeline; the thermal insulation gas storage cylinder is equipped with a second temperature sensor and a fifth pressure sensor; a volume of the thermal insulation gas storage cylinder is configured to be unchanged so as to change the pressure of the system and simulate the hydrate pressure-reduction exploitation process; and the second temperature sensor and the fifth pressure sensor measure real-time temperatures and pressures within the thermal insulation gas storage cylinder.