This paper presents the PDC bits with the satisfactory testing result in the multi-interbedded formation.
介绍了一种复合式PD C钻头，该钻头在多夹层地层钻井施工中取得了较好的试验效果。
According to the optimization design, a new type of PDC bit was produced and got better result when it was used in the multi-interbedded formation.
根据该设计制造的一种新型复合式PDC钻头在多夹层地层中取得了较好的应用效果。
PDC bits have been used to drill the homogeneous formation from soft to medium-hard, but they are not suitable for drilling in gravel and multi-interbedded formation.
PD C钻头用于软到中硬的均质地层钻进具有钻速高、寿命长等特点，但不适合含砾石地层和软硬交错地层。
Low compressive strength of soft to medium formations. Such as soft shale, soft limestone, soft sandstone, hard and soft abrasive interbedded medium formation.
低抗压强度的软到中等地层，如中软页岩。中软石灰岩。中软砂岩。和软硬研磨性夹层的中等地层。
A shale formation with sandstone interbedded is also a potential oil bearing formation.
以泥岩为主，夹砂岩的地层也可能是油气层。
Major sedimentary facies in the Huanhe-Huachi Formation include lacustrine facies, delta facies, meandering fluvial facies, and interbedded eolian sandstone facies.
而在环河华池组主要沉积了湖相、三角洲相、曲流河相及风成砂岩夹层。
Hot event deposits occurred in Liantuo Formation of Lower Sinian, interbedded in fluvial facies sandstones and siltstones.
热事件沉积产物见于下震旦统莲沱组，夹于河流相沉积的砂岩及粉砂岩中。
Hot event deposits occurred in Liantuo Formation of Lower Sinian, interbedded in fluvial facies sandstones and siltstones.
热事件沉积产物见于下震旦统莲沱组，夹于河流相沉积的砂岩及粉砂岩中。
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