[ گزارش اشكال در مقاله | بازگشت | جستجو | ليست كنفرانس‌ها ]

A New Design for Ultra Light Weight Slurry by Using Nano particles

[ soltanian ] - Research Institute Of Petroleum Industry Center for Exploration and Production Studies and Research
[ modjtahedi ] - Research Institute Of Petroleum Industry Center for Exploration and Production Studies and Research
[ mortazavi ] - Research Institute Of Petroleum Industry Center for Exploration and Production Studies and Research

خلاصه مقاله:

A new approach to cementing allows the design of high performance slurries at low as well as high densities. The technology decouples slurry and set cement performance from the slurry density. Using this technique new light weight cement slurries as low as 8.34 PPG can be designed with high compressive strength, low permeability, and low porosity for application such as completion in reservoirs with low fracture gradients, geothermal wells, single slurry for both lead and tail and many more. The technology is based on the correct selection of components for the dry blend with compounds of proper specific gravity and in an optimum ratio.
The new LWC RIPI technology increases the solids contents of the slurry. Smaller particle sizes fill the void space between larger ones, resulting in slurry requiring less water during mixing and pumping. Mechanical properties of cement- based materials with nano HSL was recently studied. Experimental results demonstrated an increase in compressive and flexural strength of mortars containing nano–particles. Based on the available data, the beneficial action of the nanoparticles on the microstructure and performance of cement-based materials can be explained by
the following factors:
􀂃 Well-dispersed nano-particles increase the viscosity of the liquid phase helping to suspend the cement grains and aggregates, improving the segregation resistance and workability of the system.
􀂃 Nano-particles fill the voids between cement grains, resulting in the immobilization of free water.
􀂃 Well-dispersed nano-particles act as centers of crystallization of cement hydrates, therefore accelerating the hydration.
􀂃 Nano-particles favor the formation of small-sized crystals such as Ca (OH) 2 and smallsized uniform clusters of C-S-H
􀂃 Nano-particles improve the toughness, shear, tensile and flexural strength of cement based materials. The advantageous properties provided by the proposed system are:
􀁺 Very high compressive strengths of 2000 PSI at 8.34 PPG and 4500 PSI at 12.03 PPG at low densities.
􀁺 Very low permeability and porosity of set cement.
􀁺 Improved stability, fluid-loss control and in most cases no free water compared to conventional systems.
􀁺 Excellent perforatability for the set cement.
􀁺 The early compressive strengths.
􀁺 The lower porosity, shorter the thickening time.
􀁺 Isolate all formation with good cement slurry.