A Cost-Effective Application of New Surfactant/Oxidant System to Enhance the Removal Efficiency of Oil-Based Mud Filter Cake
- J. Zhou (Texas A&M University) | H. A. Nasr-El-Din (Texas A&M University) | D. Socci (EthicalChem Company) | J. Holcomb (EthicalChem Company)
- Document ID
- Society of Petroleum Engineers
- SPE Western Regional Meeting, 22-26 April, Garden Grove, California, USA
- Publication Date
- Document Type
- Conference Paper
- 2018. Society of Petroleum Engineers
- 5.2.1 Phase Behavior and PVT Measurements, 5 Reservoir Desciption & Dynamics, 1.8 Formation Damage, 2.5.2 Fracturing Materials (Fluids, Proppant), 1.11 Drilling Fluids and Materials, 5.2 Fluid Characterization, 5.1 Reservoir Characterisation, 1.8.3 Fines Migration, 5.1.1 Exploration, Development, Structural Geology, 2 Well completion, 2.4 Hydraulic Fracturing, 5.2 Reservoir Fluid Dynamics
- surfactant, drilling fluids, oil-based, filter cake, removal efficiency
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Removing oil-based mud (OBM) filter cake is a difficult task. Low removal efficiency of filter cake may result in pay zone damage, including drilling fluid filtrate incompatibilities with reservoir fluids, fines migration, and undesirable change of permeability. This paper proposes a cost-effective and single-stage application of a new surfactant/oxidant system to enhance the removal efficiency of OBM filter cake.
A qualitative wettability experiment was performed to test wetting property of OBM emulsion before and after being cleaned by non-ionic surfactants. Phase behavior of the new surfactant/oxidant system was also shown when the variables were the concentration and type of coated persulfates. Filter press simulated various high-pressure/high-temperature (HP/HT) well conditions in laboratory to form and remove the OBM filter cakes. Average permeability ratio (Kfinal / Kinitial) of Berea sandstone disks was calculated by static filtration test to show the degree of formation damage.
Surfactant used in the new removal system ensures OBM emulsion to be water-wet and promotes it to flow more easily in contact with the rock surface. Coated persulfate can be circulated out of wellbore after the removal work, based on its low density and tightly coated property. HP/HT filter cake removal tests indicate the optimized new system can disperse and remove the filter cake by up to 98 wt% removal efficiency. The optimized surfactant/oxidant system affects the formation permeability slightly because Kfinal / Kinitial ratio is consistent in the 0.99~1.09 range.
With optimized formulation and soaking time, the cleaning solutions will benefit the oilfield industry significantly by removing OBM filter cake under challenging well conditions. Cost-Effective and single-stage application of the new removal system makes the oilfield industry more efficient and economical to remove OBM filter cake. The new surfactant/oxidant system minimizes the effects of drilling fluid on formation properties, based on its compatibility with OBM emulsions, quick removal steps, high removal efficiency, and acceptable Kfinal / Kinitial results.
|File Size||2 MB||Number of Pages||19|
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