Facilities at RCSG
World-class combination of equipment for well technology research
An overview of the facilities at RCSG
Drilling rig, research well and mud pumps
A drilling rig is permanently installed above a 387m deep well that is completely cemented. Experiments can be executed in the well, e.g. by installation of a casing string in the well.
Shallow test well
In addition to the 387m deep test well, the center also has a shallow well of approximately 12 m deep inside the building. This is sufficiently deep to allow a single piece of casing to be completely installed in the well. An ideal testing environment is therefore available before going to the larger scale rig and/or field application. A wellhead can be placed on top of the well enabling to put pressure on the system. The overhead cranes present in this hall facilitate the installation of the casings or tools in the well, in order to carry out experiments safely, quickly and effectively. Logging tools have recently been tested in the well and also various cement and plug testing has been undertaken.
400T hydrostatic press and 300T mechanical press
The 400T hydrostatic press and 300T mechanical press can be used to support experiments requiring large mechanical force or loads, for example mimicking formation load, placement forces or hydrostatic load. Downhole conditions can be simulated by adding heaters to the components. The presses are characterized by a simple setup to apply force on tools and materials, e.g. to test mechanical loading of casing materials. The 400T setup is able to test larger samples. Samples are automatically handled to ensure safe (hands off) installation of materials, casings, tools etc. Fluids (mud) can also be taken into account for testing. The press is simple to handle, which makes it perfect for quick preparation tests.
High Internal Pressure Equipment
The “High Internal Pressure Equipment “, or HIPE, is a 6 meter high pressure vessel specifically designed for strength testing casing and tubing. The size allows long sections of these casings or tubes. both burst and collapse tests can be performed with operating pressures of up to 1000 bar (14,504 psi). This type of test is for example relevant for the strength testing of casings made from new materials,. also, pressure testing of sensors etc. can be performed.
50T drilling equipment
The equipment present here enables the researcher to simulate the conditions for drilling in the subsurface. This mainly concerns the simulation of the high pressure that prevails in the subsurface. A drill bit is placed in the pressure vessel that can drill a rock sample that is placed in the pressure bombe. This vessel is connected to the mud pumps in the basement which deliver the fluid pressure for the drilling experiments. The mud with cuttings are transported to the shaker, similar to the ones operated in the field, where the cuttings and the liquid are separated 9similar to field operations). During drilling, a vertical load is applied to the drill head, which can reach up to 50 tons (hence the name). Because these are high pressure experiments, there are high safety standards when performing the experiments. For example, the operator space is protected with extremely thick safety glass. The RCSG uses rock samples from stock or has samples made from cement that can be used for the drilling experiments.
Flow loops
At the RCSG we have large scale flow loops to support research aiming at flow optimization for production and drilling. For the geothermal and district heat sector it is essential to reduce the pump energy for circulation as much as possible. RCSG is supporting a consortium of partners from the district heat sector and academia to investigate environmental friendly drag reducing molecules in the DRAGLOW project. Progress and results of the first phase are shared on the 14th of April 2022, please see more details here.
Cutting flowloop. This flow loop has been developed to investigate the behavior of “cuttings”, the rock and sediments that are released during drilling as grains or small chips. These cuttings need to be removed from the hole in order to prevent the well from clogging up during drilling. This hole cleaning is generally performed by pumping fluid in the well that transports the cuttings to surface. This is a crucial part of the drilling process and can be particularly cumbersome in horizontal wells. The installed tube on the flow loop is transparent, which makes it possible to monitor the flow and transport behavior with cameras. With the tube, which can be arranged horizontally, vertically from an angle, a casing bore is simulated during drilling or production. For example, a rotating drill string can be installed in the pipe to facilitate the situation in the field. It is important to understand the behavior of the cuttings and fines because they can have an impact on the mechanical performance of the drill string and bit and can also have a detrimental effect by wear on the well materials.
ESP flowloop. Geothermal wells in the Netherlands use downhole pumps (Electrical Submersible Pumps) to produce the hot water from the wells. A dedicated set-up is currently being build at RCSG for use on the cutting flowloop frame that enables the investigation of the performance of these ESP’s, as this is critical for the success of geothermal projects.
