API 7CW pdf download Casing Wear Tests
4.4.3 Substantive changes to the material chemistry or application process shall require requalifcation of thematerial.
4.4.4 The test specimen length and diameter dimensions shall be defined by this standard.
4.5Test Agency Requirements
4.5.1 The test agency shall conduct tests in accordance with this standard.
4.5.2 The test agency shall be responsible for assuring itself, the manufacturers and the operators that the testfacility, procedures and forms comply with this standard.
4.5.3 The test agency shall provide or make available for review current documentation to manufacturers oroperators on written request. This shall include, as a minimum, the following:
a) description of the facility, including any limitations on the diameter, length, temperature, load rating, and service of
specimens may be tested;
b) test procedures and forms actually used at the test facility;
c) procedures for maintenance and calibration of measuring equipment;
d) procedures for making applications for tests， the delivery of specimens，pre- and post-test dimensionalverification, and the initial installation and checkout in the test apparatus;
e) any limitations on the accessibility of the facility (such limitations shall not preclude access to the facility for
inspection by manufacturers or operators for their testing); and
f)any limitations on the receipt of proprietary, competitive, or confidential information.
4.6General Requirements for Qualification Testing Facility
4.6.1 The test facility shall be equipped with instrumentation to display and record information required by the testprocedure with a time-based recorder.
The components of the test facility systems shall have a capacity to perform the tests according to this standard.
Unless otherwise stated, all load cells and pressure transducers shall be calibrated on an annual basis.
All pressures shall be defined as gauge unless otherwise specified and shall be recorded on time-based equipment.
All test conditions without a specified tolerance shall be considered minimum values. The maximum value shall notexceed the minimum value by more than 10 %.
Because of variations in surface coating materials，manufacturer fabrication processes and preferences, and thecombined testing operations of rotation,translation, and application of compression loads; the test agency shouldstrive to control the instantaneous measurement of side-load to within ±10 % of prescribed test parameter values.
4.6.2 Unless otherwise stated,all tests shall be performed at atmospheric conditions with the temperature of thesurroundings within 45 F to 120°F.
4.6.3 The rotary subsystem shall, as a minimum, consist of the following:
a) primary rotational control subsystem for the drill stem element test specimen shall consist of a motor of sufficient
horsepower achieving minimal rotational capabilities of 155 RPM ±5 RPM against impingement of a stationarycasing specimen at a defined side-load; and
b) secondary rotational control subsystem allows the abrasive grindstone to turn at a minimal rate of 4 RPM±1RPM
during the open-hole simulator test procedure while the test specimen is being rotated by the primary rotationalcontrol subsystem at 155 RPM 5 RPM at a defined side-load.
4.6.4The circulation fluid subsystem facility shall,as a minimum, consist of the following:a) fluid density measuring instrument that shall be in accordance with APl 13B-1;
b)Marsh funnel viscometer that shall be in accordance with API 13B-1 with required timer and graduated beaker,
and recorded as a test parameter;
c) centrifuge with basic sediment and water (BS&W) sample test tubes that shall be in accordance with API MPMS,
d) magnet(s) shall be in the circuit; and
e) drilling fuid circulation shall be maintained at a flow rate range of 1.5 gallons per minute to 3.0 gallons per minute.
4.6.5 The side-load control subsystem components shall consist of a pressure relief facility to protect the systemand load cell.
4.6.6The translation control subsystem components shall be capable of doing the test.
4.6.7The tests shall be performed as prescribed in Section 6 with materials described in Section 5.
4.6.8 A written report shall be produced that is signed and dated by the test agency’s designated approval authorityor process.
The materials described in this section constitute the standard materials upon which the testing protocol is based.Deviation from these material test standards will lead to inconsistent test results over a wide ranging test population.5.2Water-base Drilling Fluid
A 9.9 pounds per gallon (ppg) to 10.1 ppg density water-base drilling fluid with a 50 second to 60 second Marshfunnel viscosity that shall be in accordance with the materials in Table 1.