Research and Application of Fracturing Technology in the Lateral Drilling to Horizontal Well of the Ultra-short Radius

With the deepening of oilfield development, Daqing Oilfield has applied the short-radius lateral drilling technology in the horizontal well on a large scale to solve the problem that the development effect of remaining oil with conventional measures are not ideal, due to the fault barrier, interwell oil remaining and oil uncontrolled by well pattern. The field test results show that the short-radius lateral drilling technology in the horizontal well is inapplicable to the ultra-low permeability reservoir development. With the increasing number of wells in different types of reservoirs, stimulation measures such as fracturing are needed to achieve an average daily-increment oil of more than 3 tons per well. In order to improve the stimulation effect of lateral drilling technology in ultra-low permeability reservoirs, a variety of technical tests, such as proper scale fracturing, large scale fracturing, and positioned multistage fracturing, have been taken. Different stimulation measures and scales have achieved incremental oil effect. Therefore, the optimal design method of fracturing technology in lateral drilling wells of different reservoirs has been established to realize the precise stimulation of low permeability or ultra-low permeability reservoirs. The field test results show that the fracturing technology applied in lateral drilling to horizontal well of ultra-short radius can realize the directional stimulation of the fixed reservoir. This technology can also improve the seepage area of the low permeability reservoir effectively and provide a powerful technical means for the remaining oil development in Daqing oilfield.