Forced cooling circulation system for drilling mud

摘要

A forced cooling circulation system for drilling mud, which includes a refrigeration unit (1), a secondary refrigerant tank (4), a coaxial convection heat exchanger (12) for mud and a mud pond (17), is disclosed. The refrigeration unit (1) is in connection with the secondary refrigerant tank (4) and the coaxial convection heat exchanger (12) for mud via a pump (2), and the coaxial convection heat exchanger (12) for mud is in connection with the mud pond (17) via a pump (15) and pipelines. Heat exchange tubes of the coaxial convection heat exchanger (12) for mud are disposed as a double-layer structure or a multi-layer structure, and the inner heat exchange tubes (23) are mounted inside of the outer heat exchange tubes (25). The secondary refrigerant or the mud is circulated in the annular space between the inner heat exchange tubes (23) and the outer heat exchange tubes (25), and the mud or the secondary refrigerant is circulated in the inner tubes (23). The flow of the circulated mud is opposite to that of the circulated secondary refrigerant, and insulation material (24) is painted on the external wall of the outer tubes (25).

主权项

1. A forced cooling circulation system for drilling mud comprising a refrigeration unit, a refrigerant tank, a coaxial convection heat exchanger, and a mud pond,
wherein an output end of the refrigeration unit is in connection with an input end of the refrigerant tank via a first valve, an output end of the refrigerant tank is in connection with an input end of the refrigeration unit via a third valve and a refrigeration unit pump, another output end of the refrigerant tank is in connection with an input end of the coaxial convection heat exchanger via a first temperature sensor, a fourth valve, a refrigerant tank pump and a second temperature sensor, an output end of the coaxial convection heat exchanger is in connection with the mud pond via a fourth temperature sensor, another input end of the refrigerant tank is in connection with another output end of the coaxial convection heat exchanger via a second valve and a third temperature sensor, and another input end of the coaxial convection heat exchanger is in connection with the mud pond via a fifth temperature sensor and a mud delivery pump, wherein a sixth temperature sensor is provided in the mud pond, a seventh temperature sensor is in connection with an output end of a mud pump extending to the mud pond, and an eighth temperature sensor is provided in a mud circulation channel from an output end of the mud pump returning to the ground, wherein the first temperature sensor, the second temperature sensor, the third temperature sensor, the fourth temperature sensor, the fifth temperature sensor, the sixth temperature sensor, the eighth temperature sensor and the seventh temperature sensor are in connection in parallel to an inspection instrument, and the inspection instrument is configured for displaying temperature values at all measuring points of the temperature sensors so that parameters related to the system can be adjusted based on the temperature values, and wherein heat exchange tubes of the coaxial convection heat exchanger are disposed in a two-layer or multiple-layer configuration, in which an inner tube is fitted within an outer tube, the inner tube the is coaxial with the outer tube, and an annular gap formed between these two tubes is configured as a circulation passage for refrigerant or mud, the annular gap being closed at two ends thereof, wherein the inner tube is configured as a circulation passage for mud or refrigerant, the circulating mud and refrigerant flowing conversely so as to form counter flow heat exchange, wherein the inner tubes are communicated with each other via flanges and U-shaped bellows, the outer tubes are communicated with each other via short tubes welded to sides of the outer tubes and flanges provided between the short tubes, and a support is welded to the outer tubes to define a distance between two neighboring outer tubes, each support having a length equal to the total length of the outer tubes between two neighboring outer tubes, and wherein a mud or refrigerant inlet and a mud or refrigerant outlet are provided on the same end of the mud convection heat exchanger, a refrigerant or mud inlet and a refrigerant or mud outlet are provided on the same side of the coaxial convection heat exchanger and communicated with the outer tubes, and an outer wall of the outer tubes is coated with a thermal insulation layer.