# US 2018/0024044 A1 · Corrosion tester tool for use during drill stem test > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0024044 A1 - Document ID: US20180024044A1 - Status: Published application - Kind: A1 - Application number: 15/547,874 - Filed: 2015-03-26 - Published: 2018-01-25 - Earliest claimed: 2015-03-26 - Assignees: Halliburton Energy Services, Inc. - Applicants: Halliburton Energy Services, Inc. - Inventors: Paul David Ringgenberg; Fernando Marcancola; Luis Fernando Lemus - Web page: https://patentgrep.com/patent/US20180024044A1 ## CPC - G01N 17/046: {Means for supporting or introducing coupons} - E21B 47/006: {Detection of corrosion or deposition of substances} - E21B 49/08: Obtaining fluid samples or testing fluids, in boreholes or wells - E21B 49/087: {Well testing, e.g. testing for reservoir productivity or formation parameters} - E21B 49/088: {combined with sampling} - E21B 34/06: in wells - G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q) - E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS ## Abstract In accordance with embodiments of the present disclosure, systems and methods for gathering corrosion data during a drill stem test (DST) performed in a wellbore extending through a subterranean formation are provided. Such systems include a specialized tool that may be run into the wellbore on a DST tubular string to perform corrosion measurements during the DST. This corrosion tester tool (CTT) may include a number of material coupons disposed therein for exposure to formation fluids routed through the CTT and the DST tubular string. The CTT may hold material coupons of several different materials that could potentially be used to form production tubing or other production equipment needed for well completion operations. After the different material coupons are exposed to the formation fluid via the CTT, the material coupons may be inspected to determine which material should be used to form the production tubing/equipment for that particular well. ## Claims ### Claim 1 A corrosion tester tool for use on a drill stem test (DST) string, the corrosion tester tool comprising: an external tool housing; a material coupon disposed inside the external tool housing; a mounting feature for mounting the material coupon inside the external tool housing to expose the material coupon to formation fluid routed through the corrosion tester tool and the DST string; and an electrical insulation material disposed inside the external tool housing proximate the material coupon to prevent galvanic corrosion of the material coupon. ### Claim 2 (depends on 1) The corrosion tester tool of claim 1, wherein the mounting feature comprises the electrical insulation material. ### Claim 3 (depends on 1) The corrosion tester tool of claim 1, wherein the mounting feature is disposed along an inner diameter of the external tool housing to expose the material coupon to a dynamic flow of formation fluid routed through a central flow passage of the corrosion tester tool. ### Claim 4 (depends on 3) The corrosion tester tool of claim 3, wherein the mounting feature comprises grooves formed on a portion of the mounting feature to increase a turbulence of the dynamic flow of formation fluid through the central flow passage. ### Claim 5 (depends on 1) The corrosion tester tool of claim 1, further comprising a plurality of material coupons arranged in a turbine configuration within the external housing tool via the mounting feature. ### Claim 6 (depends on 1) The corrosion tester tool of claim 1, further comprising a mandrel disposed within the external tool housing, wherein the mounting feature comprises at least a portion of the mandrel to expose the material coupon to a near static flow of formation fluid routed through an annulus between the mandrel and the external tool housing. ### Claim 7 (depends on 6) The corrosion tester tool of claim 6, further comprising a centralizer disposed on an outer edge of the mounting feature extending toward the external tool housing to facilitate near static conditions of formation fluid along a surface of the material coupon. ### Claim 8 (depends on 1) The corrosion tester tool of claim 1, further comprising a tensile loading assembly having the mounting feature for holding the material coupon under tensile stress during exposure of the material coupon to the formation fluid. ### Claim 9 (depends on 8) The corrosion tester tool of claim 8, wherein the tensile loading assembly comprises end caps made from the electrical insulation material. ### Claim 10 (depends on 8) The corrosion tester tool of claim 8, wherein the mounting feature comprises a tensile loading sleeve for holding a rod of the material coupon under tensile stress, or wherein the mounting feature comprises a tensile loading rod for holding a sleeve of the material coupon under tensile stress. ### Claim 11 (depends on 8) The corrosion tester tool of claim 8, wherein the mounting feature comprises a turnbuckle coupled between two opposing ends of the material coupon. ### Claim 12 (depends on 8) The corrosion tester tool of claim 8, wherein the material coupon comprises one or more fatigue pre-cracks or notches formed therein. ### Claim 13 (depends on 1) The corrosion tester tool of claim 1, further comprising a sample bottle for collecting a sample of the formation fluid routed through the corrosion tester tool, wherein the mounting feature, the electrical insulation material, and the material coupon are disposed in the sample bottle. ### Claim 14 A system, comprising: a drill stem test (DST) string comprising an isolation component for isolating a section of a wellbore drilled through a formation and a valve for facilitating a flow of formation fluid from the formation into the DST string; and a corrosion tester tool (CTT) coupled to the DST string, wherein the CTT comprises one or more material coupons mounted therein and arranged to be exposed to the formation fluid routed through the DST string. ### Claim 15 (depends on 14) The system of claim 14, wherein the one or more material coupons are arranged to be exposed to a dynamic flow of fluid through a central flow passage of the CTT. ### Claim 16 (depends on 14) The system of claim 14, wherein the one or more material coupons are arranged to be exposed to a near static flow of fluid routed through an annulus formed in the CTT. ### Claim 17 (depends on 14) The system of claim 14, wherein the one or more coupons are mounted under tensile stress in the CTT. ### Claim 18 A method, comprising: exposing one or more material coupons disposed in a corrosion tester tool (CTT) coupled along a drill stem test (DST) string to a flow of formation fluid routed through the DST string while performing a drill stem test; and analyzing the one or more material coupons after performing the drill stem test to determine a corrosion resistance of the one or more material coupons. ### Claim 19 (depends on 18) The method of claim 18, further comprising mounting the one or more material coupons in the CTT via electrically insulating mounting features. ### Claim 20 (depends on 18) The method of claim 18, further comprising selecting a material for use in production tubing/equipment based on the corrosion resistance of the material coupons.