Kazan, May 18 - Neftegaz.RU. The experts of the Tatneft’s TatNIPIneft have developed a technology for using glass fiber processing by-products in the construction of wells.
Scientists of TatNIPIneft proposed to use glass fiber pellets of 0.1 to 0.3 mm, which are the manufacturing by-products of the Tatneft - Steklovolono,as an additive to cement slurries. This inert ecological additive greatly lightens the solution and has quite a number of advantages.
The application of lightweight plugging solutions allows minimizing the risks of possible complications. Reducing the density of the plugging solution optimizes the costs of eliminating lost-circulation zones and raising the cement behind the production casing to the planned height.
Accordingly, due to the increase in the water-cement ratio, the amount of the plugging solution received from one tonne of cement increases, which also reduces the costs of cementing the production casing.
Thanks to the developed technology for qualitative cementing, it is sufficient to have one slurry formulation for the entire wellbore, which allows reducing transportation and storage costs and simplifying the production process.
At the same time, the cementation density varies from 1.4 g/cm3 to 1.45 g/cm3 and has high operational characteristics and corresponds to the claimed standards. At present, the technology has been included in the list of the Tatneft’s best practices and is at the industrial introduction stage. The area of this technology application is difficult wells, where cement stage collars were previously used.
The developed lightweight plugging solutions are also proposed to be used for liquidation of the lost-circulation zones, including cementing the surface casing with residual loss of circulation.
It was discovered in the course of pilot works that the technology allows to reducing the costs of eliminating the lost-circulation zones, reducing the risk of facing behind the casing cross flows, which also increases the wells’ operational reliability, and by improving the fluid loss, the quality of the wells is improved.
The technology of cementing casing strings with a lightweight plugging slurry is 11 % cheaper than the traditionally used technology with the application of the multi-stage collar cementing.
To read the article in Russian.