API TR 10TR5:2008 pdf download
API TR 10TR5:2008 pdf download.Methods for Testing of Solid and Rigid Centralizers.
6 Impact Test Consisting of Dynamic Loading Applicable to Hinged-type Rigid Centralizers
6.1 Test Apparatus and Description of the Test
This is considered a very severe test, and can be u5ed to ditlerentiate various oesigns me test device tsee Figure 4) applies a predetermined dynamic load to the end rings of a hinged-type rigid centralizer. The upper-end ring retainer, or clamp, which supports the upper collar of the centralizer, is part of the main structure. A second end ring retainer is located on the lower end of the traveling shaft used to apply the dynamic load. This lower clamp supports the lower collar of the centralizer being tested. The dynamic load is applied by dropping a traveling fixed weight a predetermined distance. The resulting load is absorbed by the two end collars of the centralizer being tested. The holding ability of the centralizer design under dynamic loading conditions can be determined using successive dynamic impacts.
6.2 Significant Test Parameters
6.2.1 Size of the Pre-selected Dynamic Load
As the weight is increased, the dynamic load on the centralizer increases. A weight of approximately 1.500 Ibm is
recommended.
6.2.2 Drop Distance for the Weight
The drop distance will also affect the results and should be consistent across all the comparison tests. A distance no greater than two (2) feet is recommended.
6.2.3 Number of Dynamic Impacts
The recommended maximum number of impacts is twenty (20). However in some cases, the user may apply repeated impacts to cause failure of the centralizer.
6.3 Recommended Test Parameters for Different Size Centralizers
7 Static Axial Loading Simulating Running the Centralizer Through Restrictions
7.1 Test Apparatus and Description of the Tests
Afthough operators plan to drill weilbores to gauge dimensions, there are many factors and circumstances, such as use of bi-center bits, worn bits, and swelling formations that can lead to running casing and casing hardware (centralizers, stop collars. etc.) through tortuous wellbores, under gauge hole sections, ledges, and Iceyseats, Testing is recommended to determine the effects of running centralizers through these restrictions.
7.1.1 Test Instrumentation
The instrumentation should be capable of accurately recording or otherwise indicating the application of vertical loads, including the maximum load applied during the test, as well as the load at initiation of possible damage andor failure of the centralizer, and If the safe limit of the testing device Is reached (maximum allowed load level).
7.2 Testing the Centralizer Through the Recommended Hole Diameter
In this test the centralizer is run through the recommended (design) wellbore diameter to verify that the OD of the entire centralizer is as specified by the manufacturer.
The test assembly (see Figure 7) consIsts of an Inner test casing (push mandrel) with an attached centralizer and a restriction sleeve (standard hole). The inner test casing should be similar to the inner test casing used to perform a starting or running force test as required by API Spec 100 (ISO 10427-1). The inner test casing for the restriction tests described in this section must be sufficiently robust to withstand expected loads. The restriction sleeve should be within the tolerances indicated in ISO 11960 for non-upset pipe. Burrs or similar defects should be removed prior to testing. The restriction sleeve should provide a circular restriction through which the centralizer may pass. The upper edge of the restriction should have a 45-degree, beveled end. The restriction sleeve should also be of sufficient length to allow passage of the entire length of the centralizer through the restriction. The restriction sleeve should rest, vertically or horizontally, against a fixed surface.
The centralizer should be installed on the inner test casing per manufacturer’s recommendations. One possible installation is one end of the centralizer mounted flush with one end of the inner casing. Another installation uses a stop device between the end collars. This end is inserted in the restriction sleeve. The restriction sleeve should be axially aligned with the centralizer to contact the centralizer, An axial load shall be applied to the top of the inner test casing to force the centralizer against or through the restriction sleeve while recording the load applied. Suggested load rate should be 500 lbf to 1.000 lbf per second.
The test should be continued until the centralizer fails, is completely Inside the restriction, or a maximum load of 50,000 If has been applied.
7.3 Total Circumferential Loading Test (Rigid Centralizer Only)
This test simulates the effect of running rigid centralizers through an under gauge hole section. The centralizer is pushed through a circular restriction smaller than the 00 of the centralizer. The test assembly (Figure 8) consists of an inner test casing (push man&el) with an attached centralizer and a restriction sleeve configured as follows.
