DEVELOPMENT METHOD OF PRODUCTIVE FORMATION WITH LOW-PERMEABILITY SECTION Russian patent published in 2013 - IPC E21B43/14 

FIELD: oil and gas industry.

SUBSTANCE: method involves drilling and construction of horizontal productive wells with secondary development of sections of various permeability and extraction of the product. According to the invention, horizontal well is drilled out of a section with minimum permeability to the section with higher permeability relative to the first section or vice versa. After that, a boundary between sections with various permeability is determined by means of geophysical investigations. Secondary development of sections is performed with increase in density of perforated holes at drilling intervals; at that, density of perforation holes is inversely proportional to permeability of the corresponding sections. The well is equipped with pumping units for simultaneous separate operation of sections with installation of a packer between drilling intervals. Formation product is extracted from different sections with different operating modes depending on permeability of sections - the lower permeability of the section is, the higher productivity of the pumping unit shall be. After development of the section with high permeability, the horizontal well with simultaneous separate operation is changed over for injection of a displacement agent to that section. After the section with low permeability is developed, the well is fully changed over to the injection well.

EFFECT: improving efficiency of the method owing to more complete and uniform development of the formation from the section with minimum permeability and increasing oil extraction owing to arrangement and operating mode of the horizontal production well with simultaneous separate operation.

1 ex, 1 dwg