Tatneft' imeni V D Shashina : Efficient Technologies of TatNIPIneft

TatNIPIneft experts have developed a technology of reinforced polymer systems application. The engineering development is applied to increase oil recovery and reduce water in-flow in producing wells.
The development is designed to align the profile of injectivity of injection wells and limiting water flow into producing wells.
The mechanism of action is based on creation of polyacrylamide based stable gels in the bottom-hole formation zone possessing high shear strength, as well as gel formation inducers and fibers, blocking water bearing (highly permeable washed out) reservoir intervals, resulting in decrease (stabilization) of water in-flow to the production wells and   alignment of the injectivity profile in the injection wells.
The reinforced high-strength gels formed in the formation are able to eliminate behind-the-casing flows in the interval directly adjacent to the production liner (to restrict the movement of fluid beyond the production string within the non-perforated interval).
The use of gel reinforcing fibers (polymer, basalt, glass fibers) allow increasing the efficiency of operations when implementing the process in highly permeable terrigenous, fractured/ porous and fractured (of complex structure) carbonate reservoirs, extending the economic life of wells, and thus increase the overall oil recovery.
Efficient operation of the reinforcing fibers in polymer compositions is characterized by at least three factors: physical and mechanical characteristics of the fibers, adhesion (adhesion of dissimilar surfaces) of the polymeric composition to their surface, and durability of the fiber material in aggressive formation fluids environment.
The most important technological properties of the reinforced polymer systems include the ability to form a gel with a high shear gradient (at least 1 MPa/m) over the entire range of salinity of water used in the reservoir pressure maintenance; controllability of the gel properties through changing the concentration, ratio and composition of the components of the composition, as well as all-season implementation of the process.
The technological process is implemented through production or injection wells. The technology has been commercially implemented in the fields of TATNEFT since 2014. This technology was awarded the first degree Diploma for "Best exhibit, best design or best technical solution" of the XXIst Tatarstan Oil and Gas and Petrochemicals Forum. The prestigious award was obtained in the framework of the specialized exhibition "Oil and Gas. Petrochemicals" in the nomination "Enhanced oil recovery".