Abstract 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. Nonproducing 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.
Key Words: Well block Lu-9; thin-bedded bottom-water reservoir; horizontal well; production technology
It is widely understood by petroleum industry that horizontal wells should be applied in the bottomwater reservoirs with net pay thickness over 10m and without any barrels or interbeds. Currently, there is no successful case and experience for horizontal wells in bottom-water reservoirs with net pay thickness about 3m. [1,2]
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