METHOD TO DEVELOP ISOLATED LITHOLOGICALLY SCREENED OIL-SATURATED LENSE Russian patent published in 2008 - IPC E21B43/20 

FIELD: oil and gas production industry.

SUBSTANCE: invention is related to area of layer-uplifted oil pool development at both early and late stages of development with isolated lithologically screened oil-saturated lenses drilled by a single well. Method includes identification of boundaries and analysis of lense profile, sidetracking of vertical well, packer setting, lense drilling, injection of working fluid via vertical well and recovery of wellstream via sidetracked wellbore. In accordance with the invention in case of maximum lense area 62.5 thousand m², maximum oil net pay of the lense 2 m and vertical well located in the central or marginal zone of the lense, at least one wellbore shall be sidetracked via vertical well with entry to pay bed at the minimum distance 50 m from vertical wellbore to the area with the highest recoverable reserves. The vertical well is perforated in the interval of bottom part of oil-saturated bed of the lense. Packer is set above perforation interval. Sidetrack is perforated in top part of oil-saturated bed of the lense. At that working fluid is injected in cyclic mode with well suspending.

EFFECT: improved performance of oil pool development, higher well rates and final oil recovery.

1 ex, 2 dwg