The laboratory conducts complex strength downhole screen testing. This testing is conducted in the set of benches used for various mechanical stress testing arising during equipment usage.
The mechanical bench is used for downhole sand screens testing based on API 19SS (2016), ISO 17824:2009, GOST 32504–2013– Petroleum and natural gas industries-Downhole equipment-Sand screens, except pre-pack screens. To test the working capacities with applied loads, the testing process simulates sand screen components with operational loads.
MPF-100 Bench Specifications:
The MBM-1 (Mechanical Breaking Machine) with a force capability up to 1 ton is used for the wire separation testing. Special equipment is used for the testing process. The speed of punch movement from 0.01 mm/min to 500 mm/min and the wire separation moment are set with the mechanical press.
MTM-80 (Mechanical Torque Machine) hydraulic wrench with a torque capability of 80 kN·m is used for torsion testing. The bench allows screen testing basic sizes up to 250 mm in diameter.
Description of the Main Types of Mechanical Testing:
1. Pull Test, Push off Test, End Ring Push off Test, Supporting screen elements push
Testing Performed on the MPF-100 Multifunctional Testing Bench. The primary objective of testing performed on the MPF-100 multifunctional testing bench is to determine the mechanical strength of downhole screens subjected to axial loads as per their declared specifications. The testing bench comprises a support frame, a two-way hydraulic cylinder for axial loads, mechanical fasteners adapters for the screen, and a control system for the bench. A sample of the screen being tested is fixed onto the load frame for conducting the tests.
During testing, the screen sample is subjected to axial loads, which necessitates a secure fixation of the sample to the load frame, as well as to the hydraulic cylinder rod.
Testing is performed by the following programs:
The MPF-100 mechanical testing bench is certified and calibrated by independent certification authorities.
The MBM-1 bench is used for wire wrap separation testing, also known as weld separation test. It aims to determine the mechanical strength of the welds in wire wrap screens. The testing process involves using rectangular wire wrap coupons that are cut from the screen. A mechanical press punch movement is used to produce separation force to the wire wrap from the guide rods. The strength of the wire screen weld is measured by the value of this force.
The wire wrap separation testing bench is designed to withstand loads of up to 10 kN. For manufacturers, the direct screen wrap’s validity criterion is that the welded wire connection and stiffeners should not split at a tensile load of at least 1.23 kN (125 kgf).
The wire wrap separation test bench is regularly checked for accuracy and calibration of the generated forces. Wire wrap separation testing is part of comprehensive mechanical strength screen testing.
The purpose of testing is to determine the mechanical strength of the screen under torsional loads, with the liner rotating alongside the screen. In this case, the MTM-80 bench is used for testing.Hydraulic wrench bench is utilized for testing, primarily designed for coupling installation on the nipple section of the base pipe. It controls the force torque applied to the support foot of the screen base pipe end holder, rotating around the sample axis. The screen in the second wheelbarrow is secured to the cemented part of the screen element. The practical validity criterion is to withstand a nominal torsional torque of 25 kN·m by the screen.
The purpose of this testing is to verify the mechanical strength of the screen against bending loads. A downhole liner is composed of various components and must be able to flex due to the spatial curvature of the well’s drilled trajectory. To evaluate the screen’s ability to withstand bending loads, specific tests are conducted.
To perform bend testing, screen supports, weighting agents, laser levels, and leveling rods are utilized. The screen sample is bent in a circular shape, and the minimum requirement for the screen to sustain the bend is 45 degrees over a length of 30.3 meters (100 ft).
Bending testing must be repeated at least 10 times, and the screen must retain its characteristics after testing. The slot clearances should not change by more than 5%, and the quality of the welds must be maintained.
© Sand Control Drilling Equipment Trading Ltd
Building No.280, Taweeiah, Abu Dhabi, United Arab Emirates