MATURE OIL FIELD DEVELOPMENT METHOD Russian patent published in 2024 - IPC E21B43/16 E21B7/18 

FIELD: oil industry.

SUBSTANCE: invention relates to oil industry and can be used on mature deposits with high geological heterogeneity of formations. Disclosed is a method for developing a mature oil deposit, which includes clarifying the structure of the formation during operation of wells drilled from the wellhead, searching for and evaluating a pillar of oil with residual reserves in the interwell space, selection of a candidate well with the main bore fixed with a casing string, performance of geological and technical activities using sidetracking and drilling of additional wells, development of residual reserves, including their treatment and production. At the same time before geological and technological activities and development of residual reserves of formation non-uniform in thickness and area in well-candidate with casing string is lowered tubing containing controlled from the wellhead port and diverter with magnetic mark, packer-anchor and sealant. When the tubing is lowered, the diverter is located at the level of the formation roof. Then, a coiled tubing is lowered into the tubing and the diverter, it contains a hydraulic monitor controlled from the wellhead, a circulation valve, a logging device, an inflatable packer activated by an electric pump, and a jet pump with a valve located at the lowering of the coiled tubing not lower than the diverter. When the coiled tubing is lowered into the tubing, the diverter is installed and fixed by an anchor packer with the help of a magnetic mark and a logging device at the level of the formation roof in the azimuthal profile specified taking into account its structure. Then, a hydraulic monitor is introduced into the diverter, a sand-liquid mixture is injected into the coiled tubing, and a directed outlet is created from the candidate well of a given profile. Further, under working pressure flushing fluid is injected into the coiled tubing pipe, it is fed into the tubing pipe and, with the help of a hydraulic monitor, prospecting channels are drilled on depression from the directional outlet of the main shaft, which are used for search and evaluation of oil pillars in interwell space, as well as treatment and extraction of residual reserves. At that, depression mode during drilling of prospecting and evaluation channels is created by means of gas lift – gas pumping between lifting and coiled tubing pipes through a port controlled from the wellhead, which is located near the diverter and connected to the casing string. At the same time, first, a prospecting-evaluation channel is drilled in a given profile by an undulating shaft from the roof through the middle to the bottom of the formation and back with repetition of waves along the formation, and distribution of oil pillars in the section in the vicinity of the candidate well is determined in real time using a logging device. Then, in each oil pillar installed along the section, the prospecting-evaluation channel is branched in the bed plane into a network of prospecting-evaluation channels, the oil pillar is delineated by the area and its residual reserves are estimated. Oil pillar is treated with chemical agents injected into said network of channels through coiled tubing and hydraulic monitor at activated position of inflatable packer. Development of the selected oil pillars is carried out taking into account the established value of their residual reserves. With residual reserves of up to 5 thousand tons, oil production in oil pillars is carried out from one installation of the diverter with the same equipment lowered into the candidate well using a coil tubing, an inflatable packer and a jet pump in combination with a gas lift. If the value of the established residual reserves is more than 5 thousand tons, the extracted oil pillars are developed using sidetracking and drilling of additional wells.

EFFECT: improved profitability of their development with simplification of the method, reduced capital costs and service life of the deposit, intensified oil production and increased oil recovery in the section and area of the deposit.

1 cl, 10 dwg