# US 12,000,276 B2 · System for automated real-time water injection well testing > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,000,276 B2 - Document ID: US12000276B2 - Status: Granted - Kind: B2 - Application number: 17/648,075 - Filed: 2022-01-14 - Published: 2023-07-20 - Granted: 2024-06-04 - Earliest claimed: 2022-01-14 - Assignees: Saudi Arabian Oil Company - Applicants: Saudi Arabian Oil Company - Inventors: Mohammed J. Alshakhs; Said Rifat; Abiola Onikoyi - Web page: https://patentgrep.com/patent/US12000276B2 ## CPC - E21B 49/008: {by injection test; by analysing pressure variations in an injection or production test, e.g. for estimating the skin factor (measuring pressure E21B47/06)} - E21B 49/087: {Well testing, e.g. testing for reservoir productivity or formation parameters} - E21B 47/06: Measuring temperature or pressure - E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS ## Abstract A method includes installing a measurement device on the injection wellhead, injecting a fluid into the injection well at a plurality of injection rates using a computer processor, measuring an injection bottom hole pressure at each injection rate to determine a plurality of injection bottom hole pressures using the computer processor, determining a relationship between the plurality of injection rates and the plurality of injection bottom hole pressures using the computer processor, and determining an injectivity index of the injection well using the relationship and the computer processor. ## Claims ### Claim 1 A method for an injection well having an injection wellhead, the method comprising: installing a measurement device on the injection wellhead, wherein the measurement device is configured to measure a pressure of the injection well at the injection wellhead; injecting a fluid into the injection well at a plurality of injection rates using a computer processor; measuring an injection bottom hole pressure at each injection rate to determine a plurality of injection bottom hole pressures using the computer processor, wherein the injection bottom hole pressure at each injection rate is measured using a density of a fluid in the injection well, a depth of the injection well, a pressure loss due to friction, and the pressure of the injection well at the injection wellhead at each injection rate; determining a relationship between the plurality of injection rates and the plurality of injection bottom hole pressures using the computer processor; and determining an injectivity index of the injection well using the relationship and the computer processor. ### Claim 2 (depends on 1) The method of claim 1, wherein installing the measurement device on the injection wellhead further comprises installing a flow rate measurement device and a pressure measurement device to the injection wellhead. ### Claim 3 (depends on 1) The method of claim 1, wherein injecting the fluid into the injection well at the plurality of injection rates further comprises pumping the fluid from a storage tank into the injection well using a pipeline. ### Claim 4 (depends on 1) The method of claim 1, wherein determining the relationship between the plurality of injection rates and the plurality of injection bottom hole pressures further comprises determining an equation of a straight line having a slope. ### Claim 5 (depends on 4) The method of claim 4, wherein determining the injectivity index of the injection well using the relationship further comprises equating the slope of the straight line to the injectivity index. ### Claim 6 (depends on 1) The method of claim 1, wherein determining the relationship between the plurality of injection rates and the plurality of injection bottom hole pressures further comprises determining a correlation coefficient of the relationship. ### Claim 7 (depends on 6) The method of claim 6, wherein determining the injectivity index of the injection well using the relationship further comprises determining the injectivity index of the injection well when the correlation coefficient is greater than a set limit. ### Claim 8 (depends on 1) The method of claim 1, wherein injecting the fluid into the injection well at the plurality of injection rates further comprises changing an injection rate from 130% of an operating injection rate to 70% of the operating injection rate, decreasing at an interval of 10%. ### Claim 9 (depends on 8) The method of claim 8, wherein measuring the injection bottom hole pressure at each injection rate to determine the plurality of injection bottom hole pressures further comprises changing the injection rate and measuring the injection bottom hole pressure at a set frequency. ### Claim 10 (depends on 9) The method of claim 9, wherein determining the injectivity index of the injection well using the relationship further comprises determining the injectivity index of the injection well for a plurality of cycles of time, each cycle using the set frequency to change the injection rate and measure the injection bottom hole pressure. ### Claim 11 A system for an injection well having an injection wellhead, the system comprising: a measurement device installed on the injection wellhead, wherein the measurement device is configured to measure a pressure of the injection well at the injection wellhead; and a non-transitory computer readable medium coupled to the measurement device, the non-transitory computer readable medium storing instructions comprising functionality for: injecting a fluid into the injection well at a plurality of injection rates; measuring an injection bottom hole pressure at each injection rate to determine a plurality of injection bottom hole pressures, wherein the injection bottom hole pressure at each injection rate is measured using a density of a fluid in the injection well, a depth of the injection well, a pressure loss due to friction, and the pressure of the injection well at the injection wellhead at each injection rate; determining a relationship between the plurality of injection rates and the plurality of injection bottom hole pressures; and determining an injectivity index of the injection well using the relationship. ### Claim 12 (depends on 11) The system of claim 11, wherein the measurement device further comprises a flow rate measurement device and a pressure measurement device. ### Claim 13 (depends on 11) The system of claim 11, further comprising a storage tank connected to the injection well by a pipeline. ### Claim 14 (depends on 11) The system of claim 11, wherein determining the relationship between the plurality of injection rates and the plurality of injection bottom hole pressures further comprises determining an equation of a straight line having a slope. ### Claim 15 (depends on 14) The system of claim 14, wherein determining the injectivity index of the injection well using the relationship further comprises equating the slope of the straight line to the injectivity index. ### Claim 16 (depends on 11) The system of claim 11, wherein determining the relationship between the plurality of injection rates and the plurality of injection bottom hole pressures further comprises determining a correlation coefficient of the relationship. ### Claim 17 (depends on 16) The system of claim 16, wherein determining the injectivity index of the injection well using the relationship further comprises determining the injectivity index of the injection well when the correlation coefficient is greater than a set limit. ### Claim 18 (depends on 11) The system of claim 11, wherein injecting the fluid into the injection well at the plurality of injection rates further comprises changing an injection rate from 130% of an operating injection rate to 70% of the operating injection rate, decreasing at an interval of 10%. ### Claim 19 (depends on 18) The system of claim 18, wherein measuring the injection bottom hole pressure at each injection rate to determine the plurality of injection bottom hole pressures further comprises changing the injection rate and measuring the injection bottom hole pressure at a set frequency. ### Claim 20 (depends on 19) The system of claim 19, wherein determining the injectivity index of the injection well using the relationship further comprises determining the injectivity index of the injection well for a plurality of cycles of time, each cycle using the set frequency to change the injection rate and measure the injection bottom hole pressure.