# US 9,518,434 B1 · System for ascertaining and managing properties of a circulating wellbore fluid and method of using the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,518,434 B1 - Document ID: US9518434B1 - Status: Granted - Kind: B1 - Application number: 14/061,481 - Filed: 2013-10-23 - Granted: 2016-12-13 - Earliest claimed: 2013-10-23 - Assignees: Drill Cool Systems, Inc. - Applicants: Drill Cool Systems, Inc - Inventors: Al T Champness; Anthony Worthen - Web page: https://patentgrep.com/patent/US9518434B1 ## CPC - E21B 21/08: Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure (valve arrangements therefor E21B21/10) - E21B 17/006: {Accessories for drilling pipes, e.g. cleaners (wear protectors E21B17/10; handling drilling pipes E21B19/00; thread protectors B65D59/00)} - E21B 21/01: Arrangements for handling drilling fluids or cuttings outside the borehole, e.g. mud boxes - E21B 21/062: {by mixing components} - E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS ## Abstract A system and a method of ascertaining and managing the properties of a circulating wellbore fluid is utilized, among other things, to achieve greater well control, reduce drilling and work-over expense, prevent reservoir damage and prevent personnel injuries which may result from extremely hot wellbore fluids. The system utilizes a network of sensors which detect fluid properties at various locations in the system, inputs the detected properties into a digital processor, and utilizes the processor to generate solutions for adjusting system components to realize a desired temperature and pressure profile for the fluid system. ## Claims ### Claim 1 A system for ascertaining and managing properties of a circulating wellbore fluid comprising: an output fluid piping system into which a fluid enters, the fluid exiting from a wellbore; a first sensor to sense temperature and pressure of the fluid in the output fluid piping system; a fluid processing and storage structure to process and store fluid received from the output fluid piping system wherein the received fluid is processed in the fluid processing and storage structure resulting in a processed fluid; a second sensor to sense a property of the processed fluid within the storage structure wherein the property is at least one of the properties selected from the group consisting of mass flow rate, volumetric flow rate temperature, density, viscosity, oil/water ratio, total solids content, chloride content, shear stress, gel strength, plastic viscosity, yield point, thermal conductivity, and specific heat capacity, wherein the second sensor provides input to a digital processor of the at least one fluid properties; an adjustable temperature control apparatus hydraulically connected to the fluid processing and storage structure to receive the processed fluid from a first outlet, manage the temperature of the processed fluid, and return the fluid to the fluid processing and storage structure through a first inlet, resulting in a managed temperature fluid inside the fluid processing and storage structure; a first inlet conduit between the fluid processing and storage structure and the wellbore for receiving managed temperature fluid; a third sensor to sense a property of the managed temperature fluid within the first inlet conduit, wherein the property is at least one of the properties selected from the group consisting of mass flow rate, volumetric flow rate, temperature, density, viscosity, oil/water ratio, total solids content, chloride content, shear stress, gel strength, plastic viscosity, yield point, thermal conductivity, and specific heat capacity, wherein the third sensor provides input to a digital processor of the at least one fluid properties; a controller on the adjustable temperature control apparatus which, in response to instructions determined by the digital processor, allows adjustment of the adjustable temperature control apparatus to realize the managed temperature fluid; wherein the managed temperature fluid is introduced into a drill pipe terminating with a bottom hole assembly disposed inside the wellbore. ### Claim 2 (depends on 1) The system of claim 1, wherein the digital processor provides output which is utilized by the controller to manage the temperature of the processed fluid. ### Claim 3 (depends on 2) The system of claim 2 wherein the output provided by the digital processor controls flow of a heat transfer fluid to the temperature control apparatus. ### Claim 4 (depends on 3) The system of claim 3 wherein the heat transfer fluid is at least one of the fluids selected from the group consisting of water, seawater, glycol, ethylene glycol, propylene glycol deionized water, air, refrigerated air, and dielectric fluid. ### Claim 5 (depends on 1) The system of claim 1 wherein the temperature control apparatus comprises a heat exchanger. ### Claim 6 (depends on 1) The system of claim 1 further comprising a fourth sensor to sense the temperature and pressure of the managed temperature fluid within the wellbore adjacent to the bottom hole assembly, wherein the fourth sensor provides input to a digital processor of the temperature and pressure. ### Claim 7 (depends on 1) The system of claim 1 further comprising an adjustable flow control apparatus disposed in the output fluid piping system to regulate a rate of flow and pressure of the fluid exiting from the wellbore. ### Claim 8 (depends on 7) The system of claim 7 wherein the output provided by the digital processor controls the adjustable flow control apparatus. ### Claim 9 A system for ascertaining and managing properties of a circulating wellbore fluid comprising: an output fluid piping system into which a fluid enters, the fluid exiting from a wellbore; a first sensor to sense temperature and pressure of the fluid in the output fluid piping system; a fluid processing and storage structure to process and store fluid received from the output fluid piping system wherein the received fluid is processed in the fluid processing and storage structure resulting in a processed fluid; a second sensor to sense a property of the processed fluid within the storage structure, wherein the property is at least one of the properties selected from the group consisting of mass flow rate, volumetric flow rate, temperature, density, viscosity, oil/water ratio, total solids content, chloride content, shear stress, gel strength, plastic viscosity, yield point, thermal conductivity, and specific heat capacity, wherein the second sensor provides input to the digital processor of the at least one fluid properties; a first temperature control apparatus hydraulically connected to the fluid processing and storage structure to receive the processed fluid from a first outlet, manage the temperature of the processed fluid, and return the fluid to the fluid processing and storage structure through a first inlet, resulting in a managed temperature fluid inside the fluid processing and storage structure; a first inlet conduit between the fluid processing and storage structure and a string of drill pipe disposed within the wellbore for receiving managed temperature fluid; and a third sensor to sense a property of the managed temperature fluid within the first inlet conduit, wherein the property is at least one of the properties selected from the group consisting of mass flow rate, volumetric flow rate, temperature, density, viscosity, oil/water ratio, total solids content, chloride content, shear stress, gel strength, plastic viscosity, yield point, thermal conductivity, and specific heat capacity, wherein the third sensor provides input to the digital processor of the at least one fluid properties; and a controller on the adjustable temperature control apparatus which, in response to instructions determined by the digital processor, allows adjustment of the adjustable temperature control apparatus to realize the managed temperature fluid. ### Claim 10 (depends on 9) The system of claim 9 further comprising a second adjustable temperature control apparatus hydraulically connected to the output fluid piping system to receive the fluid from the wellbore, manage the temperature of the fluid exiting from the wellbore, and return the fluid to the output fluid piping, resulting in a managed temperature fluid inside the output fluid piping system. ### Claim 11 (depends on 9) The system of claim 9 further comprising an adjustable flow control apparatus [disposed in the output fluid piping system to regulate a rate of flow and pressure of the fluid exiting from the wellbore. ### Claim 12 (depends on 9) The system of claim 9 wherein the first temperature control apparatus manages the equivalent circulating density of the processed fluid received from the first outlet. ### Claim 13 (depends on 11) The system of claim 11 wherein the output provided by the digital processor provides instructions which operate the controller of the adjustable flow control apparatus. ### Claim 14 (depends on 9) The system of claim 9 further comprising a second inlet conduit between the fluid processing and storage structure and an annulus defined between an exterior of the string of drill pipe and an interior of the wellbore for receiving temperature adjusted fluid and a fourth sensor to sense the temperature and pressure of the temperature adjusted fluid within the second inlet conduit, wherein the fourth sensor provides input to the digital processor of the temperature and pressure. ### Claim 15 (depends on 9) The system of claim 9 wherein the string of drill pipe comprises a plurality of coated piping segments. ### Claim 16 (depends on 15) The system of claim 15 wherein the coated piping segments comprise a coating which manages the transfer of energy between the managed temperature fluid within the string of drill pipe and a fluid outside of the string of drill pipe. ### Claim 17 (depends on 15) The system of claim 15 wherein the coated piping segments comprise a coating which reduces hydraulic friction as the managed temperature fluid flows through the string of drill pipe. ### Claim 18 A method for controlling a downhole temperature and pressure of a wellbore fluid circulating within a well comprising the steps of: detecting in real time at least one fluid property of the wellbore fluid as the wellbore fluid is introduced into the well, wherein the fluid property is at least one of the properties selected from the group consisting of mass flow rate, volumetric flow rate, temperature, density, viscosity, oil/water ratio, total solids content, chloride content, shear stress, gel strength, plastic viscosity, yield point, thermal conductivity, and specific heat capacity; detecting in real time at least one fluid property of the wellbore fluid as the wellbore fluid flows out of the well wherein the fluid property is at least one of the properties selected from the group consisting of mass flow rate, volumetric flow rate, temperature, density, viscosity, oil/water ratio, total solids content, chloride content, shear stress, gel strength, plastic viscosity, yield point, thermal conductivity, and specific heat capacity; calculating a setpoint surface temperature and a setpoint surface pressure which are required to achieve a desired downhole temperature and pressure at a desired depth in the well, where the temperature and pressure setpoints are dependent on a dynamic model of projected drilling conditions and/or a multivariate model from offset or historical well data; adjusting the setpoint surface temperature and the setpoint surface pressure which are required to achieve the desired downhole temperature and pressure at a desired depth in the well, where the adjustment is based upon the real time fluid property detected in the wellbore fluid as the wellbore fluid is introduced into the well and the real time fluid property detected in the wellbore fluid as the wellbore fluid flows out of the well; and managing the surface temperature, pressure and inflow rate of the wellbore fluid introduced into the well to maintain the setpoint surface temperature and setpoint surface pressure. ### Claim 19 (depends on 18) The method of claim 18, wherein a string of drill pipe is disposed within the wellbore and the wellbore fluid circulating within the well is pumped down the drill string and flows up the wellbore through an annulus defined by a space between and exterior of the drill string and an interior of the wellbore. ### Claim 20 (depends on 19) The method of claim 19 wherein the string of drill pipe comprises a plurality of coated piping segments. ### Claim 21 (depends on 20) The method of claim 20 wherein the coated piping segments comprise a coating which manages the transfer of energy between the managed temperature fluid within the string of drill pipe and a fluid outside of the string of drill pipe. ### Claim 22 (depends on 20) The method of claim 20 wherein the coated piping segments comprise a coating which reduces hydraulic friction as the wellbore fluid flows down the drill string. ### Claim 23 A system for ascertaining and managing properties of a circulating wellbore fluid comprising: an output fluid piping system into which a fluid enters, the fluid exiting from a wellbore; an active pit system connected to the output fluid piping system, the active pit system comprising a solids control tank receiving the fluid from the output fluid piping system, an intermediate tank in hydraulic communication with the solids control tank, and an active suction tank in hydraulic communication with the intermediate tank; an adjustable temperature control apparatus hydraulically connected to the active pit system, wherein the adjustable temperature control apparatus receives fluid from an active pit system outlet, adjusts the temperature of the fluid and returns the fluid to the active pit system through an active pit system inlet; a first sensor to sense a property of the fluid in the active pit system outlet, wherein the property is at least one of the properties selected from the group consisting of mass flow rate, volumetric flow rate, temperature, density, viscosity, oil/water ratio, total solids content, chloride content, shear stress, gel strength, plastic viscosity, yield point, thermal conductivity, and specific heat capacity, wherein the first sensor provides input to a digital processor of the at least one fluid properties; a second sensor to sense a property of the fluid in the active system inlet, wherein the property is at least one of the properties selected from the group consisting of mass flow rate, volumetric flow rate, temperature, density, viscosity, oil/water ratio, total solids content, chloride content, shear stress, gel strength, plastic viscosity, yield point, thermal conductivity, and specific heat capacity, wherein the second sensor provides input to a digital processor of the at least one fluid properties; and a controller on the adjustable temperature control apparatus which, in response to instructions determined by the digital processor, allows adjustment of the adjustable temperature control apparatus to realize the managed temperature fluid.