| Daqing oilfield through constant development of nearly 60 years, in the shallow reservoir and formation conditions of relatively simple area, drilling density has become saturated, especially after the adjustment wells, infill development again. Has now entered the three times to adjust the development stage, the development object is thin and poor reservoir, the geological characteristics of the interlayer is thin. In order to achieve good development effect, must ensure that the zonal isolation, therefore puts forward more strict requirements on the quality of well cementing. Compared with the three encryption by initial drilling, extra high water cut, high pressure water flooding, polymer flooding and three yuan compound drive development mode, oil reservoir different fluid dynamic effects, three encryption later adjustment well drilling the formation pressure environment, formation fluid properties and flow field distribution is more complex. In the geological structure, formation permeability, casing failure, water, injection imbalance, the influence of transverse conduction and other factors, the original pressure formation has been damaged, the pressure layer and intra layer difference prominent. Under ground fluid easily penetrated the annulus erosion cement ring, resulting in decreased cement slurry contamination and cementing quality. At present, about oilfield adjustment well cementing excellent rate of only 60%, to further improve the. In order to realize the sustainable development strategy of Daqing oilfield, put forward "to the unconventional well into, to complex well to yield" slogan, and inclined or horizontal well has become the focal point of development of oilfield.According to the characteristics of Daqing oil field developing in low friction and high stability of cement slurry, can not only effectively solve the requirements of cementing for horizontal well and high angle well, also fill the blank of Daqing oilfield this cement slurry. |
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