# US 2020/0399995 A1 · Tandem seal adapter for use with a wellbore tool, and wellbore tool string including a tandem seal adapter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2020/0399995 A1 - Document ID: US20200399995A1 - Status: Published application - Kind: A1 - Application number: 17/007,574 - Filed: 2020-08-31 - Published: 2020-12-24 - Earliest claimed: 2013-07-18 - Assignees: DynaEnergetics Europe GmbH - Applicants: DynaEnergetics Europe GmbH - Inventors: Frank Haron Preiss; Thilo Scharf; Liam McNelis; Eric Mulhern; David C. Parks - Web page: https://patentgrep.com/patent/US20200399995A1 ## CPC - E21B 43/1185: Ignition systems - E21B 43/11855: {mechanically actuated, e.g. by movement of a wireline or a drop-bar (E21B43/11852 takes precedence)} - E21B 43/119: Details, e.g. for locating perforating place or direction - F42C 19/06: Electric contact parts specially adapted for use with electric fuzes {(switches operated by change of speed H01H35/06; switches operated by change of acceleration, e.g. shock or vibration, inertia switches H01H35/14; fluid-pressure-operated switches H01H35/24)} - F42D 1/02: Arranging blasting cartridges to form an assembly (adaptation of blasting cartridges therefor F42B3/02) - F42D 1/04: Arrangements for ignition {(ignition systems for shaped charge perforators E21B43/1185; ignition devices for seismic energy generators G01V1/06)} - F42D 1/043: {Connectors for detonating cords and ignition tubes, e.g. Nonel tubes (mounting of detonators in blasting cartridges F42B3/26)} - E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS - F42C: AMMUNITION FUZES (blasting cartridge initiators F42B3/10; chemical aspects C06C); ARMING OR SAFETY MEANS THEREFOR (filling fuzes F42B33/02; fitting or extracting primers in or from fuzes F42B33/04; containers for fuzes F42B39/30) - F42D: BLASTING (fuses, e.g. fuse cords, C06C5/00; {for obtaining fluid from wells E21B43/00; for mining or quarrying E21C37/00; for making tunnels or galleries E21D9/006}; cartridges F42B3/00) ## Abstract A tandem seal adapter (TSA) for use with a wellbore tool may include a TSA body including a first end and a second end opposite the first end in an axial direction, a bore extending through the TSA body from the first end to the second end, an electrical contact assembly provided within the bore, the electrical contact assembly being configured to provide electrical connectivity through the bore. The electrical contact assembly may include a bulkhead provided within the bore. An axial position of a maximum outer diameter of the TSA body may overlap with the bulkhead in the axial direction. A portion of the bore overlapping in the axial direction with an entirety of the TSA body having an outer diameter equal to the maximum outer diameter may have a constant bore diameter. ## Claims ### Claim 1 A tandem seal adapter (TSA) for use with a wellbore tool, the TSA comprising: a TSA body comprising a first end and a second end opposite the first end in an axial direction; a bore extending through the TSA body from the first end to the second end; and an electrical contact assembly provided within the bore, the electrical contact assembly being configured to provide electrical connectivity through the bore; wherein the electrical contact assembly comprises a bulkhead provided within the bore; an axial position of a maximum outer diameter of the TSA body overlaps with the bulkhead in the axial direction; and a portion of the bore overlapping in the axial direction with an entirety of the TSA body having an outer diameter equal to the maximum outer diameter has a constant bore diameter. ### Claim 2 (depends on 1) The TSA of claim 1, wherein a line from any point within the bore to any point radially outward from the TSA body overlapping in the axial direction with the TSA body intersects the TSA body. ### Claim 3 (depends on 1) The TSA of claim 1, wherein: the bore comprises: a bulkhead body bore region consisting of any portion of the bore overlapping with the bulkhead body in the axial direction; a first bore region displaced from the bulkhead body bore region toward the first end in the axial direction and not overlapping with the bulkhead body in the axial direction; and a second bore region displaced from the bulkhead body bore region toward the second end in the axial direction and not overlapping with the bulkhead body in the axial direction; and a radius of the first bore region is different than a radius of the bulkhead bore region. ### Claim 4 (depends on 3) The TSA of claim 3, wherein a radius of the second bore region is different than a radius of the bore region. ### Claim 5 (depends on 1) The TSA of claim 1, further comprising a bore seal provided between the bulkhead body and an interior surface of the TSA body. ### Claim 6 (depends on 1) The TSA of claim 1, wherein: the bulkhead comprises: a bulkhead body; a first contact terminal; and a second contact terminal opposite the first contact terminal in the axial direction; wherein the first contact terminal is electrically coupled to the second contact terminal through the bulkhead body; and the first contact terminal, the bore, and the TSA body are coaxial. ### Claim 7 (depends on 6) The TSA of claim 6, wherein the second contact terminal is coaxial with the first contact terminal, the bore, and the TSA body. ### Claim 8 (depends on 7) The TSA of claim 7, wherein the first contact terminal is configured to make wireless electrical contact with a wellbore tool electrical contact of the wellbore tool. ### Claim 9 A wellbore tool string comprising: a first perforating gun comprising: a first gun housing: a first gun electrical assembly provided in the first gun housing; and a first shaped charge provided in the first gun housing; a second perforating gun coupled to the first perforating gun, the second perforating gun comprising: a second gun housing; a second gun electrical assembly provided in the second gun housing; and a second shaped charge provided in the second gun housing; a tandem seal adapter (TSA) extending between the first perforating gun and the second perforating gun, the TSA comprising: a TSA body comprising a first end and a second end opposite the first end in an axial direction; and a bore extending through the TSA body from the first end to the second end; wherein the first perforating gun, the TSA, and the second perforating gun collectively define an interior space; the wellbore tool string further comprises a bulkhead assembly provided within the interior space; the bulkhead assembly comprises a first bulkhead electrical contact and a second bulkhead electrical contact; the first gun electrical assembly comprises a first gun electrical contact, the first gun electrical contact being in physical contact with the first bulkhead electrical contact; and the second gun electrical assembly comprises a second gun electrical contact, the second gun electrical contact being in physical contact with the second bulkhead electrical contact. ### Claim 10 (depends on 19) The wellbore tool string of claim 19, wherein a line from any point within the bore to any point radially outward from the TSA body overlapping in the axial direction with the TSA body intersects the TSA body. ### Claim 11 (depends on 10) The wellbore tool string of claim 10, wherein a radius of the first bore region is different than a radius of the electrical contact assembly bore region. ### Claim 12 (depends on 10) The wellbore tool string of claim 10, wherein a radius of the second bore region is different than a radius of the electrical contact assembly bore region. ### Claim 13 (depends on 9) The wellbore tool string of claim 9, further comprising a bore seal provided between the bulkhead body and an interior surface of the TSA body. ### Claim 14 (depends on 9) The wellbore tool string of claim 9, wherein the first contact terminal, the bore, and the TSA body are coaxial. ### Claim 15 (depends on 9) The wellbore tool string of claim 9, wherein the first gun electrical contact is in wireless contact with the first contact terminal. ### Claim 16 (depends on 9) The wellbore tool string of claim 9, wherein the second contact terminal is coaxial with the first contact terminal, the bore, and the body. ### Claim 17 (depends on 9) The wellbore tool string of claim 9, wherein the second gun electrical contact is in wireless contact with the second contact terminal. ### Claim 18 (depends on 9) The wellbore tool string of claim 9, wherein: the first gun electrical assembly comprises a first initiator configured to initiate the first perforating gun; and the second gun electrical assembly comprises a second initiator configured to initiate the second perforating gun. ### Claim 19 A wellbore tool string comprising: a first perforating gun comprising: a housing having a first end and a second end; a first gun electrical assembly; a detonator; a detonating cord operably coupled to the detonator; and a shaped charge operably coupled to the detonating cord; wherein the first gun electrical assembly, the detonator, the detonating cord, and the shaped charge are provided within the housing; and a tandem seal adapter (TSA) coupled to the first end of the first perforating gun housing, the TSA comprising: a TSA body comprising a first end and a second end opposite the first end in an axial direction; a bore extending through the TSA body from the first end to the second end; wherein the first perforating gun and the TSA collectively define an interior space; the wellbore tool string further comprises a bulkhead assembly provided within the interior space; the bulkhead assembly comprises a first bulkhead electrical contact; the first gun electrical assembly comprises a first gun electrical contact; the first gun electrical contact is in physical contact with the first bulkhead electrical contact; and the first gun electrical contact and the detonator being positioned between the first end of the perforating gun housing and the shaped charge. ### Claim 20 (depends on 19) The wellbore tool string of claim 19, wherein a line from any point within the bore to any point radially outward from the TSA body overlapping in the axial direction with the TSA body intersects the TSA body.