TECHNICAL FIELD

The present disclosure relates to the use of multifunction hydrolysable oils to treat subterranean formations, and more particularly, to various systems and methods of using hydrolysable oils as acidizing and interfacial tension reducing additives to increase hydrocarbon production in a carbonaceous or similar formation.

BACKGROUND

Subterranean formations may be treated with various types of acids to stimulate the production of hydrocarbons therefrom. One stimulation method, generally referred to in the art as “acidizing,” involves introducing an acid solution into a subterranean formation under pressure to induce the acid solution to flow through the pores in the matrix, or the natural fractures or microfractures, present in or within the subterranean formation. The acid may dissolve any acid-soluble materials it contacts, increasing the size of the pore throats, or fractures, microfractures, or conduits or channels, and increasing connectivity between pore throats, or fractures, microfractures, or conduits or channels. As a result, the permeability of the formation may be increased.

Generally, these acidizing treatments may use highly water soluble acids that are easily dissolved in water and can be delivered in aqueous treatment fluids into the matrix of the subterranean formation. However, issues can arise with these types of acidizing treatments. In particular, some of these water soluble acids may treat only the near wellbore region of the subterranean formation. As these acids are injected into the formation, the acids are able to react with the rock in the near wellbore region and may only contact the surface of said rock in the near wellbore region rather than penetrate deeper into the subterranean formation. Further, in carbonaceous subterranean formations, the acids may spend quickly in the near wellbore region as they react with the rock, resulting in reduced reactivity in the deeper regions of the subterranean formation as the overall amount of unspent acid is reduced. Often this may result in the inability of the acid to penetrate into deeper regions of the subterranean formation and/or to effectively acidize deeper regions of the subterranean formation.

Another issue that may occur is that the water used in these acidizing treatment fluids, can become trapped in the pore throats of the formation matrix. The presence of water in the pore throat may increase the force necessary for oil to flow through the pore throat. As such, hydrocarbon production may be reduced and in some examples, further stimulation treatments may be necessary resulting in increased operational time and expense.

