Device and method for dynamically evaluating influence of additives on hydrates for long time

Abstract

The invention provides a device and method for dynamically evaluating the influence of additives on hydrates for a long time. The device comprises a temperature control system consisting of a low-temperature circulating bath and a temperature sensor; a gas circulation system consisting of a gas source, a return storage tank, a servo booster pump, a first buffer tank, a second buffer tank, a precision flowmeter, a pressure regulating valve and a flushing tank drying pipe; a hydrate generation system consisting of a reaction kettle, an upper end cover, a lower end cover and a stirring rotor; anda data recording and monitoring system consisting of a camera, a computer, the temperature sensor and a pressure sensor. By observing hydrate formation, decomposition and aggregation conditions, theinfluence of various drilling fluid additives on hydrate formation is evaluated, and a reference is provided for preventing and solving the problem of hydrate blockage in a wellbore and a pipeline inhydrate exploration and development and flow guarantee. The device has the advantages that hydrate formation is monitored within a long time span, the hydrate formation rate is monitored in real time,emission of experimental gas is reduced, and thedevice is efficient, capable of saving energy, high in measurement precision and the like.

Description

technical field [0001] The invention relates to the fields of natural gas hydrate exploration and development and oil and gas flow guarantee, in particular to a device and method for dynamic and long-term evaluation of the influence of additives on hydrates. Background technique [0002] Natural gas hydrate reserves are huge, which is equivalent to twice the total carbon content of proven fossil fuels. It is an important potential energy source. Many countries in the world have conducted hydrate production tests. In the process of hydrate exploration and development, the performance of drilling fluid directly affects the smooth progress of hydrate exploration and development, and the rational use of additives is of great significance to the performance of drilling fluid; in addition, during the long-distance transportation of natural gas, often In addition to natural gas, there is also some crude oil and gaseous or liquid water. Under certain temperature and pressure conditi...

AI Technical Summary

Problems solved by technology

[0004] In order to make up for the small time span of performance evaluation of hydrate inhibitors at the present stage, the discontinuous dynamic injection of gas, and the small temperature and pressure changes caused by the small hydrate formation rate, resulting in large differences in the performance evaluation results of hydrate additives, etc.

Images