The Study And Application Technology Of Long Killing Wells' Leakproof Cementing In The Western Of Daqing Placanticline

Because in the same bore hole which in the north of FuYang in Daqing, separately must drill from the top downward through Heidimiao, Sapugao, Fuyang and so on three set of main oil layers, requests the entire well to well cementation fine, difficulty of the well cementation work further increases. Using the conventional for well cementation, one time stripper and well cementation section is 1600m above, the well cementation leaking becomes prominent problem, especially is putaohua oil layer, the stratum bursting pressure is low, pore pressure is relative high, in the well cementation work risk of leaking is big, after the well cementation the process of cement curing, it is difficult to keep stabilization. The prominent technical difficulty mainly is"stratum bearing pressure ability is low, the striper section is long, the injection amount is big, the working time is long, and the working pressure is high".On the basis of analyzing the channeling and leaking of annular cement paste in the process of cementation, and with the requirement of protecting oily layer in low-permeability reservoir, the thesis is on the study and application of the cementation complete technology and the cementing operation parameter optimization technique in view of anti- channeling and anti- leaking. In view of the oil field exploration development special request, as well as the analyst to the above difficulty technology, this paper develops a technique of high strength low density cement well cementation, the fluid system of DFZ against leaking to toughen, applied many cementing technology of flexible plug, corollary implements the pressure analysis, the pressure forecast and working technology of killing well, well cementation.