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随着开发的深入,中原油田东濮凹陷的资源接替目标以埋深3 200.00~4 000.00m的沙3段中/下部的低渗砂岩、泥岩缝洞、灰质页岩等储层为主,储层断块发育、厚度薄且储层渗透率低。水平井可以提高泄油能力,实现少井高产,是深层油气藏低成本开发的有效技术手段,因而长水平段水平井成为东濮凹陷油气资源开发的主要手段。但由于受泥岩地层井壁稳定性差、长水平段摩阻大等影响,在钻井实践中,井壁坍塌、掉块、压差卡钻等井下故障频发,制约了水平井段的有效延伸和钻井提速。
With the deepening of development, the resources replacement of Dongpu Depression in Zhongyuan Oilfield is dominated by reservoirs of low-permeability sandstone, mudstone seam and limestone shale in the middle and lower part of Sha 3 Member with a depth of 3 200.00 ~ 4 000.00 m. Layer fault development, thin thickness and reservoir permeability is low. Horizontal wells can increase oil drainage capacity and achieve high production of less wells. It is an effective technique for low-cost exploitation of deep reservoirs. Therefore, horizontal wells with long horizontal intervals become the main means of oil and gas resources development in Dongpu Depression. However, due to the poor stability of the borehole wall in the mudstone formation and the large friction in the long horizontal section, the downhole failure caused by the collapse of the borehole wall, the dropout and the pressure difference stuck during drilling practices has restricted the effective extension of horizontal well sections and Drilling speed.