CO2-injection asynchronous-throughput energy supplement method of ultralow-permeability compact oil reservoir horizontal wells
A technology for tight oil reservoirs and energy supplementation. It is used in earth-moving drilling, wellbore/well components, and production fluids. It can solve the problems of easy gas channeling, difficulty in improving ultimate recovery, and low sweep efficiency, and achieve improved permeability. rate, easy to scale up, and simple to implement
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[0037] This implementation provides a CO injection method for horizontal wells in ultra-low permeability tight oil reservoirs. 2 The method of asynchronous huff and puff to replenish energy selects a horizontal well depletion development area in Changqing Oilfield. This area is one of the tight oil test areas in Changqing Oilfield. The average porosity of the formation is 7%-9%, the average permeability is 0.1-0.2mD, the original formation pressure is 15.8MPa, the formation crude oil viscosity is 1.23mPa·s, and the density is 0.74g / cm 3 , The gas-oil ratio is 75.40m 3 / t, saturation pressure 7.04MPa, this method specifically comprises the following steps:
[0038] Step 1, arrange horizontal well row along the direction of maximum principal stress, such as figure 1 The schematic diagram of the well row layout shown includes one local well and two adjacent wells, the well spacing is 400m, and the horizontal well length is 800m. figure 2 shown), the fracturing fluid is slick wa...
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