Shale full-diameter rock core starting pressure testing method in radial flow flowing mode

Abstract

The invention discloses a shale full-diameter rock core starting pressure testing method in a radial flow flowing mode. The shale full-diameter rock core starting pressure testing method comprises: 1)selecting a shale full-diameter rock core; 2) arranging a water injection pipeline at the center of the shale full-diameter rock core in a penetrating manner, wherein the water injection pipe is provided with an injection hole; 3) placing the shale full-diameter rock core and the water injection pipeline in a rock core clamper to form a radial flow experiment device, and calculating the pore volume of the shale full-diameter rock core, wherein the side wall of the rock core clamper is provided with an opening; 4) displacing the simulated formation water in the shale full-diameter rock core byusing simulated oil until achieving an irreducible water saturation degree to obtain the starting pressure of the shale full-diameter rock core under the irreducible water saturation degree; 5) simultaneously injecting simulated oil and simulated formation water into the shale full-diameter rock core to obtain the starting pressure of the shale full-diameter rock core under a certain water saturation degree; and 6) injecting simulated formation water into the shale full-diameter rock core to obtain the starting pressure of the shale full-diameter rock core under the residual oil saturation degree.

Description

technical field [0001] The invention relates to a start-up pressure testing method of a shale full-diameter core under a radial flow flow mode, belonging to the field of shale oil and gas resource development. Background technique [0002] In the prior art, shale oil reservoirs usually adopt the "long horizontal segment staged fracturing" production technology, because the flow mode of radial flow in the staged fracturing horizontal well accounts for more than 80%, spherical flow accounts for about 15%, and Linear flow can only be met under ideal conditions. Therefore, the existing method of testing starting pressure based on linear flow needs to be improved. [0003] Reservoir core start-up pressure testing methods can be divided into two categories: the first category is the direct method, which mainly includes the flow test method composed of the internal seepage flow test method, semi-permeable diaphragm method, mercury injection method and centrifugation method. The fl...

AI Technical Summary

Problems solved by technology

Although this method has the advantages of fast speed and low investment, its disadvantages are high requirements for preliminary testing, difficulty in popularization, and poor reliability

Although the well testing analysis method is closely combined with production, its disadvantage is that it needs to establish a variety of theoretical models in advance, especially the boundary conditions are too ideal

The test process of the well test analysis method not only affects the oilfield production, but also the test cost is high, the calculation is difficult, and it is not easy to popularize

At the same time, because the test results of the well testing analysis method are greatly affected by the boundary, the pressure curve appears upturned near the impermeable boundary (fault or pinch-out), so it is difficult to distinguish

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