Page 210 - Gas Wettability of Reservoir Rock Surfaces with Porous Media

194 Gas Wettability of Reservoir Rock Surfaces with Porous Media

6.2 Drilling Fluid Cuttings Carrying 6.3.3 Trapezoid Protection
Technology 210 Agent B 226
6.2.1 Development Status in Large 6.3.4 Establishment of Trapezoid
Displacement Wells Using Protection Technology for
Cuttings Carrying Low- and Extra-Low-
Technology 210 Permeability Water-Injection
6.2.2 Preparation and Properties Reservoirs 227
of Cutting Carrying Agent 6.3.5 Field Application of Trapezoid
FGC-1 213 Protection Agents for
6.2.3 Evaluation of FGC-1 Cutting Reservoirs 228
Carrying Effect in the 6.4 Microemulsion Oil Removal
Simulator 215 Technology 230
6.3 Trapezoid Protection Water- 6.4.1 Research Status of Cutting
injection Technology for Low- Processing Technology 230
Permeability and Extra-Low- 6.4.2 Design, Preparation, and
Permeability Reservoirs 216 Evaluation of Oily Cutting
6.3.1 Research Status of Water Degreaser 232
Injection 216 6.4.3 Field Applications 249
6.3.2 Trapezoid Protection References 252
Agent A 219

The research results of gas wettability provide a theoretical basis for further
development of petroengineering technology. Besides developing knowledge
on Reservoir Physics, the basic theory of the gas wettability system, combined
with other technologies, has resulted in new drilling fluid technology that
changes the property of rock surfaces to protect low and extra-low-permeability
reservoirs. New trapezoidal protection technology of low and extra-low-
permeability water-injection reservoirs, drilling fluid cutting-carrying technol-
ogy, and oil-containing drillings microemulsion oil removal technology have
been recently introduced, based on this basic theory. It has played an important
role in improving oil-gas recovery and protecting oil and gas resources. It has
also been tested and applied in every oilfield throughout the country, reflecting
the scientificity, advancement, and maturity of these technologies.

6.1 NEW DRILLING FLUID TECHNOLOGY THAT
CHANGES THE PROPERTY OF ROCK SURFACES TO
PROTECT LOW AND EXTRA-LOW-PERMEABILITY
RESERVOIRS
For specific damage to low-permeability and extra-low-permeability reservoirs,
the current drilling completion fluid technology that is designed to protect
reservoirs has numerous limitations. For example, the grain size of the
reservoir protective agent must strictly match the diameter of the reservoir
pore-throat. The strength of the film formed on the well wall is low, and