A Semi-Analytical Model for Computation of Maximum Sand Free Production Rate in a Perforated Horizontal Well
- Zhan Wu (Consultant) | P. V. Suryanarayana (Blade Engineering Partners) | Sriram Vasantharajan (Blade Engineering Partners)
- Document ID
- Society of Petroleum Engineers
- SPE/AAPG Eastern Regional Meeting, 7-11 October, Pittsburgh, Pennsylvania, USA
- Publication Date
- Document Type
- Conference Paper
- 2018. Society of Petroleum Engineers
- 2.4 Sand Control, 2 Well completion, 1.6.6 Directional Drilling, 3 Production and Well Operations, 2.2 Installation and Completion Operations, 3.2.3 Produced Sand / Solids Management and Control, 3.2 Well Operations and Optimization, 2.2.2 Perforating, 2.1.3 Completion Equipment, 1.6 Drilling Operations
- Perforated Horizontal Wells, Wellbore Inflow Model, Maximum Sand Free Production Rate, Sanding in Oil Well, Coulomb Criterion
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A semi-analytical framework for predicting the onset of sand production in a horizontal well is presented. The approach couples the flow in perforation tunnels with flow in the wellbore itself, to obtain a more accurate estimate of maximum sand free production rate in a well. The elastic equations of equilibrium are combined with the Mohr–Coulomb failure criterion to calculate the critical radius. A numerical, iterative solution method is used to compute the location of the elastic-plastic zone during well production. Instead of computing the pressure change in a cavity, which is difficult to characterize and implement in practice, the proposed model integrates the cavity stability criteria into the perforated wellbore inflow model to determine maximum sand-free wellbore flow rate. In addition to the typical perforation tunnel parameters such as cohesive strength, friction angle and perforation radius considered in past efforts, pressure loss effects in a wellbore (wall friction, acceleration, and fluid mixing) are incorporated into the proposed model. A numerical shooting method is then used to iteratively arrive at the maximum sand free rate for a perforated horizontal wellbore in a reservoir of known properties. Results show that without incorporation of the inflow model, the predicted maximum sand-free rates from prevailing approaches can be over-optimistic. The proposed method can be used to optimize perforation parameters to prevent sanding when designing well completions.
|File Size||855 KB||Number of Pages||11|
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