The chloride stress corrosion cracking behavior of beryllium copper and other nonmagnetic drill collar alloys
Nonmagnetic drill collars and other structural components are used to provide a region in the bottom hole assembly near the bit in which sensitive magnetic measurements can be made. Beryllium copper, Cl7200, is paramagnetic with low magnetic permeability which makes it aptly suited for nonmagnetic components. Not only are the magnetic properties of the alloys for these components important, but the integrity of the alloys under dynamic loading in a range of hostile drilling fluids is critical as well. Chlorides in certain drilling muds can cause unpredictable stress corrosion cracking (SCC) of susceptible alloys. In a standard test for chloride SCC, ASTM G 36-73, beryllium copper, Cl7200, showed no failure after 1000 hr of exposure to boiling 45 weight percent magnesium chloride solution. The applied stresses were 100 percent of the 0.2 percent offset yield strength for the alloy. Failures for austenitic stainless steels generally occurred in less than 200 hr in this environment at applied stresses of 25 percent of the yield strength. Although benefits can be obtained by controlling the environment and introducing residual compressive stresses to austenitic stainless steel components, these remedies cannot permanently eliminate the underlying susceptibility of these alloys to chloride SCC. Beryllium copper is immune to chloride SCC.
- OSTI ID:
- 7005640
- Report Number(s):
- CONF-870314-
- Resource Relation:
- Conference: Corrosion '87, San Francisco, CA, USA, 9 Mar 1987
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BERYLLIUM ALLOYS
CORROSION RESISTANCE
STRESS CORROSION
COPPER ALLOYS
DRILLING FLUIDS
CORROSIVE EFFECTS
MAGNESIUM CHLORIDES
STAINLESS STEELS
AUSTENITIC STEELS
BINARY ALLOY SYSTEMS
BOILING
COMPRESSION STRENGTH
CRACK PROPAGATION
DESTRUCTIVE TESTING
DRILLS
FRACTURE MECHANICS
SLEEVES
YIELD STRENGTH
ALKALINE EARTH METAL COMPOUNDS
ALLOY SYSTEMS
ALLOYS
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CHROMIUM ALLOYS
CORROSION
CORROSION RESISTANT ALLOYS
DRILLING EQUIPMENT
EQUIPMENT
FLUIDS
HALIDES
HALOGEN COMPOUNDS
IRON ALLOYS
IRON BASE ALLOYS
MAGNESIUM COMPOUNDS
MATERIALS TESTING
MECHANICAL PROPERTIES
MECHANICS
PHASE TRANSFORMATIONS
STEELS
TESTING
360105* - Metals & Alloys- Corrosion & Erosion
360103 - Metals & Alloys- Mechanical Properties