Method for increasing yield and injection of low-permeability oil field

Abstract

The invention relates to a method for increasing the yield and the injection of a low-permeability oil field, comprising the following steps of: (1) determining the jet parameters of a horizontal hole; (2) carrying out the jetting of the horizontal hole; (3) carrying out the jetting of the horizontal hole as follows: dividing fractured intervals; selecting a fracturing fluid; determining the half length of a fissure; and selecting a fracturing string. The method combines the horizontal hole with fracture for application, shortens the displacement distance for a first time to play a well pattern regulating role by sufficiently utilizing the advantage that a water-power deep penetration technology is not limited by ground stress, the jet aperture is larger and the jet distance is long, then carries out oil-water well corresponding fracture by utilizing jet holes, forms meshed cracks which mutually communicate by combining with the direction of the ground stress, shortens the displacement distance for a second time to be within a limited well spacing and enlarges the seepage area, thereby fundamentally solving the problem that a yield and injection increase measure of the low-permeability oil field is limited and having great significance on the high-efficiency development of low-permeability oil field.

Description

technical field [0001] The invention relates to a method for increasing production and injection of crude oil in the field of oil recovery, in particular to a method for increasing production and injection of low-permeability oil wells. Background technique [0002] With the continuous deepening of oil exploitation in our country, the permeability of reservoir rock near wellbore in low-permeability oilfields often determines the efficiency of oil well production and the amount of output. In the past, technical measures such as hydraulic fracturing, dense drilling, detonation fracturing, acidizing, and perforation were often used to improve the recovery rate of low-permeability reservoirs, but the effect has not been very satisfactory. If the fracturing depth is less than 1m, it is difficult to control the fracturing depth; the high-energy gas fracturing depth is limited, the closure is fast, and the validity period is short. [0003] Low-permeability oilfields have the prob...

AI Technical Summary

Problems solved by technology

In the past, technical measures such as hydraulic fracturing, dense drilling, detonation fracturing, acidizing, perforating and other technical measures were used to improve the recovery rate of low permeability reservoirs, but the effect has not been very satisfactory. If the fracturing depth is less than 1m, it is difficult to control the fracturing depth; the high-energy gas fracturing depth is limited, the closure is fast, and the validity period is short

[0003] Low-permeability oilfields have the problems of low single well production, high water injection pressure, and limited production and injection measures

Moreover, due to the small limit well spacing of low-permeability oilfield technology, it is difficult to shorten the well spacing and establish effective displacement by conventional single technology, and it is difficult to achieve the effect of increasing production and injection

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