Applying gas assisted gravity drainage (GAGD) process in a fractured medium oil reservoir is led to create a gas invaded zone in the reservoir in which the gravity drainage mechanism caused to produce oil from the matrix blocks of this zone; but whereas gravity drainage mechanism is gradual and slow, so the oil production decreases from matrix blocks of this zone which is caused to reduce the oil production from the reservoir. To solve this problem, this research investigates hot gas injection

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... n the GAGD process in a fractured medium oil reservoir. Hot gas injection in the GAGD process in a fractured medium oil reservoir will accelerate the gravity drainage mechanism in the hot gas invaded zone in two ways: firstly, whereas hot injected gas has got low density, the density difference will be increased in the hot gas invaded zone Therefore, high volume of hot injected gas penetrates into matrix blocks from fractures and leads to more oil production from matrix blocks. Secondly, hot gas injection will increase the oil production from matrix blocks with oil viscosity reduction within matrix block, therefore it leads to create a new process entitled ˝hot gas assisted ace-lerate gravity drainage (HGAAGD)˝. Simulation results by CMG simulation software show that HGAAGD process has more oil production rate, cumulative oil production, and less gas-oil ratio (GOR) than the GAGD process. Also HGAAGD process has 1.56% more oil recovery factor than GAGD process.