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From left: Hans Joakim Skadsem and Jostein Sørbø.


Cementing experiments

04.12.2017

Ullrigg Drilling and Well Centre constructed and tested four annulus test assemblies, three of them with a model hole enlargement. Measurements showed that it is difficult to get good cement at all places inside and directly above the washout.

The experiments are part of the knowledge building project Cementing irregular wellbore geometries, managed by Senior Research Engineer at IRIS, Hans Joakim Skadsem. He explains that Ullrigg Drilling and Well Centre at IRIS have constructed and instrumented four annulus test assemblies, each 24 meters long and constructed with 7” inner tubing placed in outer 9 5/8” casing. Three of the assemblies had a model hole enlargement, simulated by a 2.5 m long segment of 16” outer casing.

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Assisted by Halliburton
The assemblies were cemented this November, assisted by Halliburton who designed and delivered fluids and cementing personnel. Cement slurry and a spacer fluid were mixed in the batch mixer at IRIS, and one of the mud pumps at Ullrigg Drilling and Well Centre was used to pump spacer and slurry to the assemblies. The experiments were performed by first filling each assembly with spacer fluid and displacing this by a denser, more viscous cement slurry. The purpose of the experiments was to investigate how the hole enlargement and inner-string eccentricity affects cement placement in near horizontal annuli. Measurements recorded during displacement will be compared with CFD simulation results, and the state of the hardened cement will be investigated by pressure and leakage tests. - The first set of tests has already been performed and another will be conducted again in about a month, says Hans Joakim Skadsem.

Hole enlargement made for challenging cementing
- The experiments have been done according to plan and preliminary observations are as expected. We have tried to recreate parts of what happens in a well during cementing. We confirmed that density differences between the fluids are important for cementing eccentric annuli, and preliminary observations indicate residual spacer fluid in the washout and also after the washout. The next step is to investigate whether we predict similar results with the simulation tool we use to investigate annulus fluid displacements.  Project Manager, Per Simensen and his team at Ullrigg Drilling and Well Centre did a great job planning and executing the experiments, and we had good collaboration with Halliburton along the way, Hans Joakim Skadsem concludes
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E-mail address: sigmund.stokka@iris.no
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P. O. Box 8046, 4068 Stavanger, Norway
Prof. Olav Hanssensvei 15, 4021 Stavanger

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