Hutubihe formation in Well block Lu-9 of Luliang oilfield, Junggar basin of Xinjiang, China is characterized by special thin-bedded, low-amplitude reservoirs with edge and bottom water. Non-producing reserves are mostly distributed in small thin-bedded lenticular sand bodies with edge and bottom water. The average reservoir thickness is less than 3m. Therefore, the water-oil contact relationship is relatively complicated and it is difficult to produce oil from vertical wells. As a result, the economic benefit is poor. Based on the detailed reservoir description and dissection of single oil-bearing sandbodies, classification of flow units, accurate identification of net pay and low-resistivity oil-water zones, pilot horizontal-well production is carried out. Meanwhile, research on accurate well track control, reasonable horizontal section length, well placement pattern and injection-production well spaces are performed. Thus, a set of horizontal well production technologies are established for this kind of reservoirs. On the basis of optimization of non-producing reserves of different oil-water relationships and different geological characteristics in the range of an 800m interval, 110 horizontal wells are allocated with the newly-established productivity of 400 thousand tons. The producing extent of reserves has been improved from 50.7% to 83.2% and pretty good effects have been gained.

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