Openhole Gravel-Pack Case Histories in Wells Drilled With a Synthetic Mud: Successful Implementation of an Alternative Method in Oyo Field, Nigeria
- Giuseppe Ripa (ENI E&P) | Massimo Rossi (NAE) | Daniele Staltari (ENI E&P) | Meshack Ilobi (Allied Energy Corporation) | Tito Lawal (Allied Energy Corporation) | Maye Beldongar (Schlumberger) | Tekena Gift Douglas (Schlumberger) | Philip Wassouf (Schlumberger) | Andrew Granger Kennedy Jones (M-I Swaco) | Mehmet Parlar (Schlumberger)
- Document ID
- Society of Petroleum Engineers
- SPE Annual Technical Conference and Exhibition, 19-22 September, Florence, Italy
- Publication Date
- Document Type
- Conference Paper
- 2010. Society of Petroleum Engineers
- 1.10 Drilling Equipment, 1.12.1 Measurement While Drilling, 2.4.5 Gravel pack design & evaluation, 2.2.3 Fluid Loss Control, 4.1.2 Separation and Treating, 1.12.2 Logging While Drilling, 2.4.3 Sand/Solids Control, 2.7.1 Completion Fluids, 1.11 Drilling Fluids and Materials, 1.7.5 Well Control, 4.1.5 Processing Equipment, 1.7 Pressure Management, 2 Well Completion, 5.5.2 Core Analysis, 1.6.6 Directional Drilling, 1.6.2 Technical Limit Drilling, 5.2 Reservoir Fluid Dynamics, 1.8 Formation Damage, 1.10.1 Drill string components and drilling tools (tubulars, jars, subs, stabilisers, reamers, etc), 1.6 Drilling Operations, 2.5.2 Fracturing Materials (Fluids, Proppant), 1.6.1 Drilling Operation Management, 4.5.3 Floating Production Systems, 5.6.4 Drillstem/Well Testing, 4.6 Natural Gas
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Openhole gravel packing is a popular completion technique in challenging, high transmissibility reservoirs. Many of such wells are drilled with synthetic fluids and completed with either a single- or a two-trip technique.
In single trip approaches, the entire wellbore is displaced to water-base fluids before running screens and subsequent gravel packing. Although successful in some cases, this technique has been problematic in reactive shale environments, due to problems in screen installation to target depth, resulting from shale swelling and/or collapse. Such problems led operators to a two-trip approach, where a predrilled liner is installed in synthetic-base mud (SBM), displacements performed to water-base fluids and the screens are run in solids-free water-base fluids environment, followed by gravel packing. In recent years, another approach was introduced, in which the displacements to water-base fluids are performed after the screens are installed in conditioned mud and the packer is set, followed by gravel packing with a water-base fluid. Although this approach eliminates the difficulties associated with screen installation as well as allowing a single-trip completion (no predrilled liner), it cannot be used in cases where conditioning is impractical.
In this paper, we present case histories, where screens were installed after the openhole was displaced to a solids-free SBM and cased hole to completion brine, and gravel packing was performed using a water-base carrier fluid. This approach provides a costeffective alternative to displacement of the entire wellbore to solids-free SBM as well as eliminating the risk of screen plugging, and was successfully implemented on two oil producers in Oyo field. Details of design, execution and evaluation for drilling and completion stages, as well as well productivity measures are provided, along with a discussion of a continuous circulation device successfully used during drilling.
|File Size||389 KB||Number of Pages||13|