欢迎您！东篱公司
退出
-
申报数据库
-
立项数据库
-
成果数据库
-
项目获奖数据库
中文摘要：
涡流钻头通过反向喷嘴和高速旋转形成负压漩涡,降低井底压差,提高钻井的机械钻速.对涡流钻头降压机制进行研究.采用混合网格计算方法分析反向喷嘴的轴向倾角、径向倾角、上返流量、出口高度和旋转速度等对涡流钻头降压性能的影响,并提出涡流钻头的设计原则.结果表明：反向喷嘴下方井底钻井液回流是影响涡流钻头降压能力的主要因素.涡轮钻头设计的理论原则：轴向倾角为150°～ 180°、径向倾角为60°～75°、上返流量大于30％、反向喷嘴的出口高度为100～140 mm,井壁间隙应小于3 mm,尽可能地提高钻头旋转速度.
英文摘要：
The drilling practice of oil and gas wells has indicated that reducing the bottom-hole pressure difference can signif-icantly improve the rate of penetration （ROP）. Vortex drilling-bit can reduce the bottom-hole pressure difference via a re-verse nozzle to generate a vortex flow due to the high rotary speed of the drilling-bit. The depressurization mechanism of thevortex bit was analyzed. By using a hybrid mesh method, the key factors that affect the depressurization capacity of the vortexbit were investigated, which include axial angle, radial angle, reverse flow ratio, rotation speed, bit clearance, and distancebetween reverse nozzle outlet and the bottom-hole wall. The results show that backflow below the reverse nozzle outlet is themain reason that can decrease the depressurization effect of the vortex bit. A guideline for the design of the vortex bit is givento maximize the depressurization effect. The optimum axial and radial angles are 150°-180°and 60°-75°respectively, andthe flow ratio of the reverse nozzle is best above 30%. The bit clearance should be kept below 3 mm, and the distance be-tween the reverse nozzle outlet and the bottom-hole surface can be 100-140 mm. The rotation speed of the bit should be aslarge as possible.
同期刊论文项目
同项目期刊论文
Study on a Ranging System Based on Dual Solenoid Assemblies, for Determining the Relative Position o
Mechanical Analyses of Casings in Boreholes, under Non-uniform Remote Crustal Stress Fields: Analyti
Effects of organo-modified montmorillonite on the tribology performance of bismaleimide-based nanoco
Coupled dynamic analysis of deepwater drilling riser under combined forcing and parametric excitatio
Experimental investigation on the non-planar propagation of hydraulic fracture in Fractured Shale Re
Finite element analysis of deepwater conductor bearing capacity to analyze the subsea wellhead stabi
On the collapse resistance of multilayer cemented casing in directional well under anisotropic forma
Simulation and analysis of coal seam conditions on the stress disturbance effects of pulsating hydro
On the Use of PEBI Grids in the Numerical Simulations of Two-Phase Flows in Fractured Horizontal Wel
Finite element method for simulating the effects of torque and drag on buckling of tubular inside bo
A new method for determining the minimum gas injection rate required for hole cleaning in horizontal
Static analysis of deep-water marine riser subjected to both axial and lateral forces in its install
Structure,and Properties of Poly (vinylacetate-co-methyl methacrylate) Nanocomposite Microspheres Wi
The Research on Borehole Stability in Depleted Reservoir and Caprock: Using the Geophysics Logging D
In-situ encapsulating MMT intermediate particles by suspension polymerization of poly (methyl methac
Mechanical behavior analysis for the determination of riser installation window in offshore drilling
Reactivation mechanism of natural fractures by hydraulic fracturing in naturally fractured shale res
A magnet ranging calculation method for steerable drilling in build-up sections of twin parallel hor
A new electromagnetic beacon tool for directional drilling in steam assisted gravity drainage horizo
Real-Time Prediction and Optimization of Drilling Performance Based on a New Mechanical Specific Ene
The sensibility of mechanical behavior to loading rate for shale gas reservoir with different weak p
On Appropriately Matching the Bottomhole Pendulum Assembly with the Anisotropic Drill Bit, to Contro
期刊信息
位置：