System and method for detecting density and mass flow of dual-pressure drilling fluid

Abstract

The invention discloses a system and a method for detecting the density and mass flow of dual-pressure drilling fluid. The system comprises two drilling fluid detection pipelines, a second drilling fluid detection pipeline, a drilling fluid reservoir and a data processor, wherein the drilling fluid inflow ends of the two drilling fluid detection pipelines are communicated with a drilling fluid conveying main line, and the drilling fluid outflow ends of the two drilling fluid detection pipelines are communicated with the drilling fluid reservoir by virtue of a spherical valve; each drilling fluid detection pipeline comprises a pressure regulation device, a pressure sensor, a temperature sensor and a Coriolis mass flowmeter; the input end pipeline of each pressure regulation device is internally provided with a spherical valve, and the outlet end pipeline of each pressure regulation device is communicated with the corresponding Coriolis mass flowmeter; each pressure sensor is arranged in the output end pipeline of the corresponding pressure regulation device; the temperature sensors are arranged on the Coriolis mass flowmeters; the data processor is respectively connected with the Coriolis mass flowmeters of the two drilling fluid detection pipelines. The system and the method have the advantage that the relation among the pressure intensity, density and mass flow of the drilling fluid is detected in real time.

Description

technical field [0001] The invention belongs to the technical field of drilling fluid detection, and in particular relates to a detection system and a detection method for dual-pressure drilling fluid density and mass flow. Background technique [0002] In the process of oil extraction, drilling fluid plays an important role: 1. Clean the bottom of the well, carry cuttings, avoid repeated cutting of the drill bit, and reduce the wear of the drill bit; 2. Balance the side pressure of the rock on the well wall to prevent the collapse of the well wall; 3. Balance the formation pressure , to prevent blowout and lost circulation; 4, cooling and lubricating the drill bit, reducing wear and tear of drilling tools, improving the service life of drilling tools, etc. On-line detection of the density and mass flow rate of the drilling fluid to achieve precise control of the material ratio of the components of the drilling fluid is a necessary condition to ensure that the drilling fluid...

AI Technical Summary

Problems solved by technology

However, the existing online detection equipment for drilling fluid density and mass flow rate cannot well deal with the influence of pressure changes on the detection accuracy of drilling fluid density and mass flow rate.

[0004] At present, the equipment used for online detection of drilling fluid density and mass flow mainly includes isotope meters and Coriolis mass flow meters. Isotope meters contain radioactive substances, and long-term use will affect human health. In addition, isotope meters are expensive and a large number of Adoption would result in high production costs

[0005] Coriolis mass flowmeter, although there is no shortage of radioactive substances harmful to human health, when using Coriolis mass flowmeter to detect the density and mass flow rate of drilling fluid, a single pressure is used, that is, a detection line is used to detect The density and mass flow rate of drilling fluid, it is difficult to judge the impact of changes in drilling fluid pressure on the real-time detection of drilling fluid density and mass flow rate, therefore, the use of a single pressure density and mass flow rate detection system is not conducive to the real-time detection of drilling fluid density and mass flow rate Accurate detection

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