Welltest Of Horizontal Well And Multiply-Fractured Horizontal Well

Horizontal well testing was key of horizontal well exploitation technology, also was important method of acquainting with reservoir and appraising reservoir. For low permeability reservoir, only adopting horizontal well exploitation method sometimes will not achieve expectant exploitation purpose, hence, combined hydraulically fractured technology with horizontal well technology, then formed hydraulically fractured horizontal well technology. It may increase drainage acreage and enhance oil or gas extension both in vertical direction and horizontal direction; can be used in exploiting thin layer oil-gas formation and fastigium shape oil-gas formation; and also useful in exploiting the reserves and remaining oil which are difficult to exploit using traditional method; it is well-known that the function of a trunk well are equal to multiply wells made, so increased single well productivity. Hence, it is a very important problem to perform well test, evaluate the deliverability of the fractured horizontal well, and optimize the fracture parameters. According to the problems in the well testing interpretation for horizontal well or fractured horizontal well, this paper put forward a new well test analysis method, which on the basis of gas reservoir-fracture-horizontal wellbore coupling seepage model, carried on following works:1. Deeply anatomize the current well testing interpretation method for horizontal well and fractured well, put forward improved well testing interpretation method for horizontal well and fractured well; basing on the analysis of the well test interpretation method for vertical fracture well, carried out the well test analysis method for fractured horizontal well, and also put forward new auto-matching method.2. Study and put forward multiply fracture system, the new seepage flow characteristic after carrying out fractured to horizontal well for the first time, then, through comparing the pressure dynamic analysis, production pressure drawdown and productivity index between infinite conductivity multiple fracture and finite conductivity multiple fracture, obtain the optimization rule for fractured horizontal well distribution.3. Currently, the test design mainly depend on field experience, or directly use traditional well testing design empirical relation, but the traditional well testing...