| Autor: |
Naima Bestaoui-Spurr, Harold Dean Brannon, Frances H. Debenedictis, Dorianne Arlene Castillo |
| Rok vydání: |
2017 |
| Předmět: |
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| Zdroj: |
Day 4 Thu, March 09, 2017. |
| DOI: |
10.2118/183799-ms |
| Popis: |
Well stimulation fluids have been shown to improve oil and gas well productivity in both conventional and unconventional formations. Many formations contain multiple producing zones and areas of high and low permeability; therefore, during stimulation treatments, creating and increasing conductivity networks is highly desired. The most traditional method to increase conductivity networks is by diverting well stimulation fluids from high-permeability zones to low-permeability zones. This can be achieved by using various types of materials and techniques such as forming a filter cake that blocks off the high-permeability zone so that the fluid can be redirected to low-permeability zones. A more innovative approach is to use a diverter system made of dissolvable agents with proppants to force flow to the high-resistance path instead of the low-resistance path. The two types of particles are mixed in a way that they block any permeability from high-permeability zone once placed, effectively creating diversion of the fracturing fluid to other areas. Once the agent has provided its benefits and has dissolved, it leaves behind a proppant pack in both the lowand high-permeability zones, providing conductivity that is not otherwise achieveable. The fracture geometry is consequently enhanced by ensuring that the fluid and proppant are able to access all available fracture networks and open perforations. This paper describes an evaluation of two biodegradable particles and their application as diverters and also in combination with proppants for diversion.Conductivity studies were performed to determine regained conductivity under stress and temperature. The dissolution profiles of two soluble particles and comparison with polylactic acid were also performed in static conditions as function of time, size and type of carrier fluid for individual particles as well as their mixtures with proppant. The conductivity studies showed that once the dissolvable particles dissolved, the proppant pack provides conductivity that is orders of magnitude higher than when only the biodegradable particles are used for diversion. The studies also show that a material with glass transition temperature below the application temperature had better strength for high-temperature application, and each material has a dissolution profile that is a function of the particle size distribution and temperature. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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