# US 8,783,353 B2 · Increased energy impact tool > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,783,353 B2 - Document ID: US8783353B2 - Status: Granted - Kind: B2 - Application number: 13/037,653 - Filed: 2011-03-01 - Published: 2011-09-01 - Granted: 2014-07-22 - Earliest claimed: 2010-03-01 - Assignees: Smith International, Inc. - Applicants: Vishal Saheta; Arley G. Lee - Inventors: Vishal Saheta; Arley G. Lee - Web page: https://patentgrep.com/patent/US8783353B2 ## CPC - E21B 31/1135: {Jars with a hydraulic impedance mechanism, i.e. a restriction, for initially delaying escape of a restraining fluid} - E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS ## Abstract A downhole jarring tool includes a mandrel having a small diameter portion and a large diameter portion, a detent cylinder sealingly disposed around the mandrel forming an enclosure, a divider disposed in the enclosure between the mandrel and the detent cylinder, wherein the divider partitions the enclosure into a storage chamber and a metering chamber, and a metering system disposed around the mandrel. A method of applying an impact force using a downhole jarring tool includes moving a mandrel with respect to a detent cylinder by applying an axial force, positioning the mandrel such that a metering system disposed on the mandrel enters a reduced diameter portion of the detent cylinder, transmitting energy to an energy storing component disposed inside the detent cylinder, metering a fluid through the metering system, and accelerating the mandrel with respect to the detent cylinder. ## Claims ### Claim 1 A downhole jarring tool comprising: a mandrel having a small diameter portion and a large diameter portion; a detent cylinder sealingly disposed around the mandrel, forming a sealed enclosure; a divider disposed in the enclosure between the mandrel and the detent cylinder, wherein the divider partitions the enclosure into a storage chamber and a metering chamber; and a metering system disposed in the metering chamber below the divider. ### Claim 2 (depends on 1) The tool of claim 1, wherein the divider is at least one of a floating piston and a bladder. ### Claim 3 (depends on 1) The tool of claim 1, wherein the storage chamber comprises an energy storing component. ### Claim 4 (depends on 3) The tool of claim 3, wherein the energy storing component is configured to be pre-charged to between approximately 100 and 10,000 psi. ### Claim 5 (depends on 4) The tool of claim 4, wherein the energy storing component is configured to be pre-charged to approximately 3000 psi. ### Claim 6 (depends on 3) The tool of claim 3, wherein the energy storing component is at least one of a compressible fluid and a compressible mechanical device. ### Claim 7 (depends on 6) The tool of claim 6, wherein the compressible fluid is compressible up to 75 percent by volume. ### Claim 8 (depends on 6) The tool of claim 6, wherein the compressible fluid comprises at least one of nitrogen and silicone. ### Claim 9 (depends on 6) The tool of claim 6, wherein the compressible mechanical device comprises a spring. ### Claim 10 (depends on 2) The tool of claim 2, wherein the floating piston is sealed against the mandrel and the detent cylinder. ### Claim 11 (depends on 1) The tool of claim 1, wherein the metering system comprises: a detent ring disposed adjacent the large diameter portion of the mandrel wherein the detent ring further comprises a metering passage disposed therethrough and a metering pin disposed in the metering passage; and a detent retaining ring disposed adjacent the detent ring, wherein the detent retaining ring engages the mandrel. ### Claim 12 (depends on 1) The tool of claim 1, wherein a first fluid disposed in the storage chamber is different from a second fluid disposed in the metering chamber. ### Claim 13 A method of applying an impact force using a downhole jarring tool, the method comprising: moving a mandrel with respect to a detent cylinder by applying an axial force; positioning the mandrel such that a metering system disposed on the mandrel enters a reduced diameter portion of the detent cylinder from a large diameter portion of the detent cylinder; transmitting energy to an energy storing component disposed inside the detent cylinder; metering a fluid through the metering system; and accelerating the mandrel with respect to the detent cylinder, wherein the accelerating the mandrel comprises releasing energy stored in the energy storing component, thereby increasing a fluid impulse acting on the mandrel. ### Claim 14 (depends on 13) The method of claim 13, wherein transmitting energy to an energy storing component comprises compressing the energy storing component. ### Claim 15 (depends on 13) The method of claim 13, wherein transmitting energy to an energy storing component comprises: moving the mandrel and the metering system upward; and moving a piston upward. ### Claim 16 (depends on 15) The method of claim 15, wherein moving a piston upward compresses at least one of a compressible fluid and a compressible mechanical device. ### Claim 17 (depends on 13) The method of claim 13, wherein metering the fluid through the metering system comprises allowing the fluid to flow from an upper portion of a metering chamber to a lower portion of the metering chamber through a passage disposed in a detent ring. ### Claim 18 (depends on 13) The method of claim 13, further comprising the step of pre-charging the energy storing component. ### Claim 19 (depends on 13) The method of claim 13, wherein the axial force is applied to the mandrel in an upward direction. ### Claim 20 (depends on 13) The method of claim 13, wherein the mandrel is accelerated in an axially upward direction with respect to the detent cylinder. ### Claim 21 (depends on 20) The method of claim 20, wherein the mandrel jars a component disposed therebelow. ### Claim 22 (depends on 13) The method of claim 13, further comprising: returning the metering system to the large diameter portion of the detent cylinder; and allowing the fluid to flow around the metering system.