A kind of test method of selective permeability ability of proppant
A testing method and proppant technology, applied in permeability/surface area analysis, measurement devices, instruments, etc., can solve the problem that the proppant performance varies greatly, cannot reflect the proppant properties well, and restricts the new type of selective proppant. problems such as research and development and selective proppant application, to achieve the effect of simple operation
Active Publication Date: 2018-05-04
PETROCHINA CO LTD
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Problems solved by technology
[0005] The traditional simple dynamic test method usually uses a single-phase liquid to measure the selective permeability of the proppant in the sand-packed pipe under normal pressure conditions. The measurement results are quite different from the performance of the proppant in actual application. When the proppant is in the fractures of the reservoir, it is under pressure. In addition, multiphase liquids are usually used in practical applications, so the traditional simple dynamic test method cannot reflect the properties of the proppant well.
[0006] At present, there are no relevant literature reports at home and abroad on the method of testing the oil phase and water phase selective permeability of proppants under overburden and dynamic conditions, which restricts the research and development of new selective proppants and the application of selective proppants in oil fields. Field application
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[0057] The present embodiment provides a kind of test method of proppant selective permeability ability, and this method comprises the following steps:
[0058] 1) Preliminarily estimate the proppant laying concentration required to achieve the required conductivity according to the characteristics of the reservoir, which is 5Kg / m in this example 3 ;
[0059] 2) Set the laying area of the diversion chamber: the diversion chamber 1 is a cuboid structure, and its three-dimensional structure schematic diagram is as follows figure 1 As shown, the interior of the diversion chamber 1 is divided into two regions, namely the transition region S 0 and the comparison area S, where the interior of the comparison area S is divided into two equal sub-areas, namely S 1 and S 2 (Such as figure 1 and figure 2 shown), S 0 , S 1 , S 2 Constitute the proppant laying layer 3;
[0060] The flow direction of the fluid is horizontal, and the transition zone S 0 and the contrast zone S a...
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The present invention provides a proppant agent selective penetration capability test method. The method comprises the following steps: 1) a diversion chamber is internally divided into a transition zone S0 and a contrasting region S, the contrasting region S is internally divided into n equal sub-regions, wherein, n>=2, and n is a natural number; 2) a to-bet-tested proppant agent is respectively laid in different sub-regions in accordance with a predetermined laying concentration; 3) a closure pressure is applied to the diversion chamber; 4) oil and water phases are uniformly mixed and allowed to enter the diversion chamber, fluid inflow pressure is measured, and fluid pressures outflowing from different sub-regions, oil phase flow rate and water phase flow rate are respectively measured; and 5) according to Darcy law, oil phase relative permeability and water phase relative permeability of the proppant agent in each sub-region can be respectively calculated. The proppant agent selective penetration capability test method can provide a true reflection of oil phase and water phase selective penetration capability of different proppant samples in same pressure system and dynamic conditions.
Description
technical field [0001] The invention relates to a method for testing the selective permeability of proppant, in particular to a method for testing the selective permeability of different proppant samples under the same pressure system, and belongs to the field of oil and gas field development. Background technique [0002] After the fracturing is completed, the proppant can support the hydraulic fractures that have been opened, keep the fractures open but not closed, maintain a certain conductivity of the fractures, and provide channels for the flow of oil and gas from the formation to the wellbore. The effective fracture length and conductivity of fractures directly determine the stimulation effect of oil and gas wells, and these factors are closely related to the properties of proppant. [0003] Traditional proppants mainly include: natural quartz sand, resin coated sand (resin coated ceramsite), high, medium and low density ceramsite. With the development of reconstructi...
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IPC IPC(8): G01N13/04G01N15/08
CPCG01N13/04G01N15/0826
Inventor 许志赫王中学姜伟崔明月才博李阳李素珍杨振周鄢雪梅高跃宾
Owner PETROCHINA CO LTD