Study Of Segregated Fracturing Horizontal Well For Low Permeability Reservoir And Inflow Performance Relationship Of Horizontal Well For Bottom Water Reservoir

The horizontal well is an advanced secondary oil recovery technology. The application for the horizontal wells includes two aspects. One is used to develop the low permeability reservoir with segregated fracturing horizontal wells and the other is used to develop the residual oil at the top of thick layers in the hypertonic reservoir when development is at the high water cut stage, which can be caused a series of more complicated problems of reservoir engineering.This dissertation focuses on a series of reservoir engineering problems about using horizontal wells to develop the low-permeability reservoir and bottom water reservoir. For low-permeability reservoir, Combined the numerical simulation for the model of Wu Ping-3 horizontal wells five point pattern in Wu -420 of the Changqing field, it mainly research on the segregated fracturing horizontal well and the evaluation method for its mixed pattern of productivity. It comprehensively analyzes of the impact of reservoir sensitivity parameters, and has been a number of characteristics results. For the high permeability bottom water reservoir, firstly it presents the mechanism of coning, and then bases on the general vertical well, finally completes the research on the inflow performance of horizontal well for bottom water reservoir. It is important to discuss the modeling of two or three-dimensional, and then contrasts the five models at the end of the numerical solution. Combined with the numerical simulation of the L8-P18 horizontal well, it is better to guide the horizontal well technology application in the bottom water reservoir.Through researching, it is mainly to obtain the following results: 1) the application of equivalent diameter model, combined with a five-point pattern mixing formula is derived come with infinite and finite segeration vertical fracture in horizontal well productivity formula. 2) Conventional bottom water reservoir was at the end of the axial symmetry of two-dimensional flow model water reservoir studies, the establishment of an ordinary straight axisymmetric bottom water coning model, given the principle of the derivation and solution process, vertical wells have been coning general formula for calculating . 3) Ozkan simplified formula is used only under the conditions of the two re D≥3.3or L D≥2.3, and the definition of boundary conditions is very ambiguous, it hard to applicate of the process and derive it. In this paper, these two points for further calculation of the impact of FL and FBH parameters, and derived non-simplified formula. And a clear definition of the boundary conditions to complete the round at the bottom water model and the formula of the principle of method, in combination with the formation of stable water ridge conditions, gives out a new three-dimensional model of the formula for bottom water reservoir.The results of dissertation can be used to optimize the design of fractured horizontal wells in the application of low permeability reservoir. And the study of bottom water reservoir engineering is to determine the development of horizontal wells to optimize production systems, improve the ultimate recovery purposes.