水平井技术在小构造油藏挖潜中的应用

Application of Horizontal Well Technology in the Development and to Tap the Potential of Mine-structural Oil Reservoir

 黄伟

Huang We i

 江苏油田分公司地质研究院

Geolog ica l Research In stitute of J iangsu O ilf ield Branch Company, Yangzhou, 225009, Ch ina

 　 安丰油田安丰1断块K₂t₁³是典型底水油藏,在直井开发16年后已进入高含水开发后期,针对开发调整难度大,含水上升快的开发特征,研究了剩余油分布规律、挖潜技术以及水平井优化设计技术界限,提出了水平井技术在小构造油藏挖潜中的应用并现场实施。投产后效果很好,初产高,含水低,大大提高了断块的采油速率,采收率由 25%提高到38%,单井增加可采储量3.5×10⁴t,相当于直井的3倍多。

With the p rogress of development technique of oilfield,
the p roduction 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.Block 1 of An-Feng is a typ ical bottom-water oil
reservoir in An-Feng oilfield1 It has entered a high water-cut
period of development, having been developed over 16 years
with verticalwells. The effect of development and adjustment
with verticalwells is not relatively well, as a result of water-
cut rising faster1Therefore, it was decided that An-Feng 1
block was developed and adjusted with horizontal
wells.Horizontal wells have been designed, on the basis of
research on the characteristic of oilfield development and the
distribution rule of remaining oil.After putting into
p roduction, the effect is comparatively well, showing a high
initial p roduction and low water cut.Oil p roduction rate of the
fault block has greatly been increased; recovery factor has
been raised from 25% to 38%. Increases of 3 500 t of
recoverable reserves per well has been obtained which is
equal to over 3 times of verticalwell.