Application of horizontal well technology in the development adjustment of segment bottom water oil reservoir in Ng_2,Block Lin 2

With the progress of development technique of oil field, the production technology of horizontal well is getting more and more perfect. It brings into obvious economic benefit, especially for bottom-water oil reservoir, vertical-fissure oil reservoir, heavy oil reservoir and less permeable oil reservoir.Ng_2 of Block Lin2 is a typical bottom-water oil reservoir in Linpan oil field. It has entered a high water-cut period of development, having been developed over 20 years with vertical wells. The effect of development and adjustment with vertical wells is not relatively well, as a result of bottom water coning more seriously and water-cut rising faster. Therefore, it was decided that Guan 2 bottom-water oil reservoir of Lin2 block was developed and adjusted with horizontal wells. 8 horizontal wells have been designed, on the basis of research on the characteristic of oil field development and the distribution rule of remaining oil. After putting into production, the effect is comparatively well, showing a high initial production and low water cut. Oil production rate of the fault block has greatly been increased; recovery factor has been raised from 34.7% to 45.4%. An average increases of 35,000t of recoverable reserves per well has been obtained which is equal to over 3 times of vertical well. The development effect is perfectly well. It is provided with instruct signification to the development adjustment of the similar bottom-water oil reservoir in the later period of high water cut.