DCHA
6Pages

Downhole Coupon Holder Assembly  Measures Metal Loss of Downhole Tubing  Analyze Corrosion Effects, Including General, Crevice, and Stress Corrosion and Pitting  Rated to 10,000 psi and 350ºF (167ºC)  Setting and Retrieval at any Depth  Available for Purchase or Lease Production wells typically contain water, carbon dioxide, and hydrogen sulphide. This combination of elements along with varying temperatures, creates an extremely corrosive environment, subjecting, the downhole tubing to corrosion damage including metal loss, pitting, and stress corrosion cracking. The Downhole Coupon Holder Assembly (DCHA) was developed to test the effects of different types of corrosion on downhole tube materials, including general corrosion, crevice corrosion, stress corrosion, and pitting in downhole conditions. The DCHA holds up to nine coupon holders, including Bent‐Beam, Strip, and Cylindrical. The three types of coupon holders can be “mixed and matched” according to the type of corrosion effects you are evaluating. The DCHA is normally used conjunction with the DCMS™ Downhole Tool, but may also be installed separately. If more than nine samples are required, multiple DCHAs may be mated together. The DCHA can also be used in conjunction with Cosasco's Downhole electrical resistance

Installation, Setting, and Retrieval of DCHA Tool: Wireline Running Tools Downhole Coupon Holder Assembly With the appropriate wireline tools the DCHA can be set easily at any required depth. Customers may use their own preferred wireline company for running tools and DCHA installation and removal. Cosasco can provide requirements for A Coupon Holder Assembly is available for use by itself or in conjunction with the DCMS Downhole Tool. The coupon holder is available in ...

Gauge Ring (Cutter) Running Tools The set of Gauge Ring Running Tools are used prior to installation of the DCHA. The Gauge Ring tool is used to gauge the I.D. of the tubing and to make sure there are no obstructions in the tubing down to the depth where the tool will be set. It may also be used to remove paraffin that may have accumulated on the inner diameter of the tubing. DCHA Wireline Running and Setting Tools This set of tools is used to lower and set the DCHA into position. The Hydrochron ...

Installed DCHA Tool String This Installed DCHA string is connected to the DCHA by a 5/8” sucker rod connection. The Plunk Whiskered Bomb Hanger shown to the right suspends the Downhole Tool inside the diameter of the tubing. It contains a set of dog grabs, engaging the tubing to prevent any upward or downward movement, assuring the DCHA stays in place. The Plunk Hanger Safety Tool contains a second pair of dog grabs and as backup in case there is any loss of line tension during installation. ...

Ordering Information: Downhole Coupon Holder Assembly Model DCHA Description Downhole Coupon Holder Assembly* Code Number of Coupon Holders (all of one or a combination of coupon holder types below) 6 Standard with 6 Coupon Holder Assemblies 9 Standard with 9 Coupon Holder Assemblies Code Cylindrical Coupon Holders 0‐9 Number of Cylindrical Coupon Holder Assemblies Code Strip Coupon Holders 0‐9 Number of Strip Coupon Holder Assemblies Code Bent‐Beam Coupon Holders 0‐9 Number of Bent‐Beam Coupon Holder Assemblies Example *Includes carrying case ...

Description Coupon Holder Assembly Only (For 9 coupon holder assemblies) 5/8" Sucker Rod Connector Only Bull‐Nose 5/8" Sucker Rod Connector 5/8" Pin Sucker Rod to 5/8" Box S.R. Adapter Downhole Tension Spring Downhole Spring Carrier Strip Coupon Holder Assembly (Coupon not included) Strip Coupon Holder End Cap Cylindrical Coupon Holder Assembly (Coupon not included) Cylindrical Coupon Holder End Cap 316 SS Coupon Holder Body (Strip/Cylindrical) Bent‐Beam Test Fixture (Coupon not included) Bent Beam SS Coupon Holder Body ...