Non-contact drilling fluid density sensor

Abstract

The invention discloses a non-contact drilling fluid density sensor, which comprises a deep probe and a shallow probe. A gas-guide hole of the deep probe and a gas-guide hole of the shallow probe are respectively connected with a deep probe capillary gas-guide pipe and a shallow probe capillary gas-guide pipe in a sealing way; the deep probe and the shallow probe are respectively in threaded connection with a deep probe compression resistance pipe and a shallow probe compression resistance pipe in a sealing way; the deep probe capillary gas-guide pipe and the shallow probe capillary gas-guide pipe respectively penetrate through the inside part of the deep probe compression resistance pipe and the inside part of the shallow probe compression resistance pipe; a deep probe temperature sensor and a shallow probe temperature sensor are respectively arranged in the deep probe compression resistance pipe and the shallow probe compression resistance pipe. According to the non-contact drilling fluid density sensor provided by the invention, air isolation of drilling fluid and a pressure sensor is realized, accurate density calculation is realized by adopting a temperature compensation and non-linear correlation algorithm, and the non-contact drilling fluid density sensor is simple in structure, convenient to use and low in cost.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to a non-contact drilling fluid density sensor. Background technique [0002] In drilling operations, it is often necessary to measure the density of drilling fluid. Usually, drilling instruments or logging instruments contain density sensors; these sensors are all contact type, that is, the two diaphragm pressure transmitter bodies used It needs to be in contact with the drilling fluid, and its basic principle is the differential pressure method; due to the complex characteristics of the drilling fluid, which has the characteristics of high impurity content and high viscosity, the mud will form deposition or adhesion on the surface of the sensor diaphragm after long-term use, which is The surface of the diaphragm needs to be cleaned frequently, otherwise it will greatly affect the measurement accuracy; in addition, due to the high corrosiveness of the drilling fluid, it will cause ...

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Problems solved by technology

[0002] In drilling operations, it is often necessary to measure the density of drilling fluid. Usually, drilling instruments or logging instruments contain density sensors; these sensors are all contact type, that is, the two diaphragm pressure transmitter bodies used It needs to be in contact with the drilling fluid, and its basic principle is the differential pressure method; due to the complex characteristics of the drilling fluid, which has the characteristics of high impurity content and high viscosity, the mud will form deposition or adhesion on the surface of the sensor diaphragm after long-term use, which is It is necessary to clean the surface of the diaphragm frequently, otherwise it will greatly affect the measurement accuracy; in addition, due to the high corrosiveness of the drilling fluid, it will cause irreversible damage to the diaphragm, which greatly affects the life of the sensor

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