An Investigation into Current Sand Control Methodologies Taking into Account Geomechanical, Field and Laboratory Data Analysis

Abstract

Sand production is one of the major issues in the development of reservoirs in poorly cemented rocks. Geomechanical modeling gives us an opportunity to calculate the reservoir stress state, a major parameter that determines the stable pressure required in the bottomhole formation zone to prevent sand production, decrease the likelihood of a well collapse and address other important challenges. Field data regarding the influence of water cut, bottomhole pressure and fluid flow rate on the amount of sand produced was compiled and analyzed. Geomechanical stress-state models and Llade’s criterion were constructed and applied to confirm the high likelihood of sanding in future wells using the Mohr–Coulomb and Mogi–Coulomb prototypes. In many applications, the destruction of the bottomhole zone cannot be solved using well mode operations. In such cases, it is necessary to perform sand retention or prepack tests in order to choose the most appropriate technology. The authors of this paper conducted a series of laboratory prepack tests and it was found that sanding is quite a dynamic process and that the most significant sand production occurs in the early stages of well operation. With time, the amount of produced sand decreases greatly—up to 20 times following the production of 6 pore volumes. Finally, the authors formulated a methodological approach to sand-free oil production.

Comprehensive Review of Demulsifiers based on Magnetic Nanoparticles for Oil-water and Water-oil Separation

“…At acidic conditions, this property of asphaltenes is more pronounced due to the large number of carbocyclic groups in the structure. The stability W/O emulsion increases at pH below 7.0, as water drops do not merge well (60,64,(74)(75)(76)(77)(78)(79)(80)(81)(82)(83)(84)(85)(86). In this case, the cationic type MNP demulsifier is preferable.…”

Analyzing Efficiency of Joint Operation of Gas Separator and Screw Pump on High-viscosity Gas-liquid Mixture

“…The popularity of the application of screw pumping units with electric drive can be associated with the technological necessity of working in complicated conditions when pumping viscous systems with the presence of solid phase and high gas content in the pumped product (8,9). In Russia, screw pumps are not widely used due to their low reliability when operating in wells with low wellhead pressures, but the operating conditions of wells of Russkoye OGCF and analogous fields indicate the promising application of screw pumps, taking into account the increased efficiency of their operation with low wellhead pressures (5,10).…”

Substantiation of In Situ Water Shut-Off Technology in Carbonate Oil Reservoirs

“…There is provided an application of in situ water shut-off technologies to minimize water flooding of the wells of the object under investigation [2,5,10,[19][20][21][22][23][24][25]. Therefore, analyzing all the above, it should be noted that well No.…”