METHOD FOR DEVELOPMENT OF OIL DEPOSIT WITH CIRCULAR INJECTION WELL IN MIDDLE OF ELEMENT Russian patent published in 2025 - IPC E21B43/20 E21B43/30 

FIELD: obtaining oil from wells.

SUBSTANCE: invention relates to the oil industry and can be used in the development of an oil deposit. Disclosed is a method of developing an oil deposit with a circular injection well in the middle of an element of a well pattern, which includes drilling a pattern of production and injection wells, pumping a displacement agent and extracting the product. At the same time oil deposit is drilled with sparse pattern of wells 800×800 m and its arrangement is carried out. Then the geological structure of the deposit is specified, the degree of inhomogeneity in the area and section is determined, and maps of the distribution of reservoirs over the area are plotted. Then the well pattern is compacted to design 400×400 m, in which the grid element is formed by drilling on the sides of the element horizontal wells with a length of at least 300 m, forming a square, leaving up to the corners of element 50 m parallel to the foot and not less than 3 m from it, and deep perforation is performed throughout the borehole in each well. Each perforation hole is spaced from the previous one by not more than 12 m and azimuth direction is at least 60° from each other subperpendicular to the main borehole, having in this case at least 25 holes located evenly along the borehole of each well along a spiral with depth of 1.5-2 m each. At the point of intersection of diagonals of the square of the grid element, a circular well is drilled with an entrance to the formation and angle of 4.5° by 10 m, a circle with radius of 127 m is reached and drilling is completed when a straight line connecting two opposite vertices of the square grid is reached. At the same time from the point of entry to the bottom of the circular well there left is 100-127 m for oil displacement from the circle to production horizontal wells with deep perforation, the shafts of which are located at distance of 2 m from the formation bottom.

EFFECT: increasing oil recovery from oil deposit with heterogeneous reservoir due to maximum coverage of deposit by drainage in area and section.

1 cl, 1 dwg