METHOD FOR DEVELOPMENT OF DEPOSIT OF HIGHLY VISCOUS OIL OR BITUMEN Russian patent published in 2016 - IPC E21B43/24 E21B7/04 

FIELD: oil industry.

SUBSTANCE: invention relates to methods for development of heavy oil deposits. Method of developing deposit of high-viscosity oil and bitumen is carried out using a pair of horizontal injection and production wells, horizontal sections which are placed parallel one above other in a reservoir. Wells are equipped with casing strings, which enable to conduct simultaneous pumping of heat carrier and extraction of products. Method includes steps of pumping coolant, heating producing formation to create a steam chamber, collecting product with pumps through a bottom production well on tubing, end of which is positioned on opposite ends of conditionally horizontal well portion defined mineralisation simultaneously withdrawn in a selection process water, determining dependence of uniformity of heating steam chamber on change in mineralisation of incidentally collected water, controlling coolant injection mode or collection of well production to achieve a stable value of mineralisation in incidentally collected water, ensuring uniform heating of steam chamber. According to invention, before construction of wells and appraisal well during construction of wells produce coring producing formation, exploring that determine water salinity and composition of dissolved elements. Based on said data, determine optimum mineralisation in incidentally collected water in collection process, corresponding to minimum steam-bitumen ratio, in order to maximise oil recovery from reservoir. After heating reservoir chamber and formation of steam in selection process at least once a day simultaneously determine salinity water sample directly in flow measuring devices produced products. After achieving stable value of incidentally extracted water controlled pumping of heat carrier to injection well and product extraction from production well without heat carrier breakthrough to production well so that extracted water mineralisation maximally approximates to optimal.

EFFECT: technical result is increasing oil recovery factor.

2 cl, 3 dwg, 2 ex