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Collaborating Authors
Results
Successful Application of the New Double-effect Protector in Deep Well Drilling
Zhu, Xiaohua (State Key Lab of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University) | Liu, Shaohu (Southwest Petroleum University) | Shi, Changshuai (Southwest Petroleum University) | Tong, Hua (Southwest Petroleum University) | Nie, Rongguo (Southwest Petroleum University)
Abstract This paper discusses a new double-effect protector (DEP). The serious wear of casing and drill pipe brings huge economic losses in drilling. On the basis of the traditional technology, a new DEP is designed, to reduce the wear of casing and drill pipe. The DEP's volume, which can be worn, increases 14% than the traditional protector's. As design and optimization by CAE software, the maximum stress, which is caused by the contacting collision&friction, is greatly lowered. As design and optimization by using CFD software, the fluid pressure loss of the DEP's annulus space, is decreased 17.5% than the traditional protector's. A new composite has been synthesized firstly, and has excellent mechanical performance, for example, abrasion resistant performance at high temperature. By using the Nonlinear Drillstring System Dynamics Simulation and Torque & Drag forecasting software, the study has been completed, which is about installed number and position of DEPs, for reducing wear on casing and friction on drill string in the typical deep well, and then the scheme, that the DEP is reasonably mounted, is applied while drilling. This document describes the first application of the DEP in X301 on Southwest oilfield, Sichuan, China. From the practice, the DEP's average working life has been enhanced 200 hours. Because of the use of the DEP, the wear of casing and drill pipe is effectively reduced, the quality of wellbore is improved, and the drilling period is shortened. The DEP and matching technology can provide effective technical support for deep well drilling and post-mining.
- North America > United States (0.70)
- Asia > China > Sichuan Province (0.54)
Abstract This paper presents a new Flexible Bottomhole Assembly (BHA), which is classified as a coupled driven drilling BHA of the power anti-deviation, with the technical superiority of anti-deviation and high ROP. The coupled driven drilling has simultaneously two driving powers: one is from kelly/rotary-table or top-drive; another is from positive downhole motor (PDM). Comparing with the traditional BHA, the new BHA for coupled driven drilling uses a short flexible sub and the appropriate PDC bits with high hydraulic efficiency and high cleaning and cooling capacity, which has rationally distributed the stabilizers' spacing, and has scientifically designed the structure of PDM centralizer's size. The new BHA used for coupled driven drilling is based on an integrated mechanical model. Through the analysis on the kelly/rotary-table and rotor centrifugal force and their transmission efficiency, the fulcrum role to PDM centralizer and its leverage ratio, the formation force and the geometric anti-deviation force, and the coupling analysis on the above factors, this paper has set up an anti-deviation force's calculation model of the coupled driven drilling, a relationship model between the allowable well-deviation and the critical WOB, a PDC bit gauge length design model, and the structural designed model of PDM centralizer. According to the above integrated model from the view of the whole system, a set of software moduli, a coupled driven drilling BHA mechanical analysis and drilling parameters optimization, is developed to determine the optimum BHA through different formation parameters, drilling parameters, the design requirements to well-deviation and ROP. The new BHA and the matching technology have been in successful application in the part of oil blocks of the Bohai Sea in China, the ROP and well-deviation meet the design requirements, and borehole quality has been improved significantly.
- Asia > China (0.51)
- North America > United States (0.47)
- Well Drilling > Drilling Operations (1.00)
- Well Drilling > Drilling Equipment (1.00)
- Well Drilling > Drillstring Design > BHA design (0.74)
- Well Drilling > Well Planning > Trajectory design (0.71)