METHOD FOR EXTRACTION OF HEAVY AND HIGH VISCOUS HYDROCARBONS FROM UNDEGROUND DEPOSITS Russian patent published in 2008 - IPC E21B43/24 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to method of extraction of tar sand or of heavy oil with high viscosity from underground deposit. The essence of the invention is as follows: the method includes boring and preparing to operation of a pressure well which is finished with a horizontal section in a deposit and of a producing well a horizontal section of which is finished in the deposit below the level of the pressure well, then the method includes formation of a permeable zone between the pressure and producing wells of heat carrier into the pressure well and simultaneous withdrawal of hydrocarbons from the producing well. According to the invention a horizontal section of a pressure well is oriented to the side of a producing well at length of 95-99% of distance between the wells. A horizontal section of the producing well is oriented to the side of the pressure well at length of 95-99% of distance between the wells. At that an additional horizontal section in the pressure well is made towards the producing well of length consisting 10-15% of distance between the wells. Also an additional horizontal section in the producing well is made towards the pressure well of length consisting 10-15% of distance between the wells. A permeable zone is formed between horizontal sections of pressure and producing wells. For that, before operating, hydro breaks are performed successively for each row of wells with pumping a horizontal layer of proplant.

EFFECT: increased efficiency of deposit development.

2 dwg