# US 9,752,423 B2 · Method of reducing impact of differential breakdown stress in a treated interval > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,752,423 B2 - Document ID: US9752423B2 - Status: Granted - Kind: B2 - Application number: 14/939,853 - Filed: 2015-11-12 - Published: 2017-05-18 - Granted: 2017-09-05 - Earliest claimed: 2015-11-12 - Assignees: Baker Hughes Incorporated - Applicants: Baker Hughes Incorporated - Inventors: John M. Lynk - Web page: https://patentgrep.com/patent/US9752423B2 ## CPC - E21B 43/26: by forming crevices or fractures - E21B 33/134: Bridging plugs - E21B 34/063: {Valve or closure with destructible element, e.g. frangible disc (E21B34/103 takes precedence)} - E21B 43/11: Perforators; Permeators - E21B 43/14: Obtaining from a multiple-zone well - E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS ## Abstract A uniform interval treatment method features a plug with a breakable member in a passage set above a perforated interval so that pressure above the plug can be build up to the desired pressure that is high enough when the rupture disc breaks to deliver a burst of pressure at a level to overcome differential breakdown stress in the interval. A ball is then dropped on a seat on the same plug and captured so that it will stay on the seat when a gun is removed above. Another gun with a plug are delivered and the gun fired with the previous plug having a landed ball in the seat. The plug is again positioned above the just made perforations and the gun is removed. The rupture disc breaks to uniformly treat the next interval with a pressure to overcome differential breakdown stress of heterogeneous rock in the treated interval. ## Claims ### Claim 1 A subterranean treatment method, comprising: perforating a first interval at spaced locations; leaving said spaced locations open to a borehole; sealing the borehole uphole of perforations, made by said perforating while said perforations remain open to the borehole, with a first plug; building up borehole pressure against said first plug to a predetermined level while said perforations remain open to the borehole below said first plug; and opening a passage in said first plug to communicate said built up pressure to said spaced perforations in the interval for the treatment. ### Claim 2 (depends on 1) The method of claim 1, comprising: providing the interval with formations having differential breakdown stress. ### Claim 3 (depends on 1) The method of claim 1, comprising: selecting said predetermined pressure level higher than a highest breakdown stress in the interval. ### Claim 4 (depends on 1) The method of claim 1, comprising: closing a passage in said first plug to isolate the interval already treated. ### Claim 5 (depends on 4) The method of claim 4, comprising: delivering another plug with a perforating gun above said first plug; and repeating the steps of perforating, sealing, building up pressure, opening a passage and closing a passage, in at least a second interval uphole of said first interval until a zone of all the intervals is fully treated. ### Claim 6 (depends on 5) The method of claim 5, comprising: removing said plugs or opening a respective passage in each plug for production from the zone. ### Claim 7 (depends on 1) The method of claim 1, comprising: providing a breakable member in a passage in said first plug; and breaking said breakable member with said predetermined pressure. ### Claim 8 (depends on 7) The method of claim 7, comprising: notching said breakable member or selecting a wall thickness thereof to obtain said predetermined pressure. ### Claim 9 (depends on 1) The method of claim 1, comprising: running in said first plug with a perforating gun; and moving said first plug with said perforating gun after said perforating gun is fired. ### Claim 10 (depends on 9) The method of claim 9, comprising: setting said first plug while releasing from said fired perforating gun; and removing said perforating gun with a wireline. ### Claim 11 (depends on 9) The method of claim 9, comprising: performing said running in with flow into the borehole. ### Claim 12 (depends on 1) The method of claim 1, comprising: initiating or propagating fractures in the interval with said opening a passage. ### Claim 13 (depends on 1) The method of claim 1, comprising: performing at least one of hydraulic fracturing, stimulation, tracer injection, cleaning, acidizing, steam injection, water flooding, and cementing as said treatment. ### Claim 14 A subterranean treatment method, comprising: perforating a first interval; sealing a borehole uphole of perforations made by said perforating with a first plug; building up pressure against said first plug to a predetermined level; and opening a passage in said first plug to communicate said built up pressure to perforations in the interval for the treatment; providing a breakable member in a passage in said first plug; and breaking said breakable member with said predetermined pressure; providing a ball seat on an uphole end of said first plug; and locating said breakable member downhole of said seat on said first plug. ### Claim 15 (depends on 14) The method of claim 14, comprising: providing a capture device on said first plug to retain a ball after the ball lands on said seat. ### Claim 16 A subterranean treatment method, comprising: perforating a first interval; sealing a borehole uphole of perforations made by said perforating with a first plug; building up pressure against said first plug to a predetermined level; and opening a passage in said first plug to communicate said built up pressure to perforations in the interval for the treatment; closing a passage in said first plug to isolate the interval already treated; delivering another plug with a perforating gun above said first plug; and repeating the steps of perforating, sealing, building up pressure, opening a passage and closing a passage, in at least a second interval uphole of said first interval until a zone of all the intervals is fully treated; performing said closing with a ball delivered ahead of said another plug and a perforating gun; and using flow through said first plug to seat said ball on said first plug and to position said another plug and perforating gun. ### Claim 17 A subterranean treatment method, comprising: perforating a first interval; sealing a borehole uphole of perforations made by said perforating with a first plug; building up pressure against said first plug to a predetermined level; opening a passage in said first plug to communicate said built up pressure to perforations in the interval for the treatment; and equalizing flow among perforations in locations of differing breakdown stress by said opening a passage.