Han C.,Southwest Petroleum University |
Zhang J.,Southwest Petroleum University |
Liu Y.,Kingdream Public Ltd Company
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2013
Based on the heat transfer theory, the mechanism of temperature change in stator rubber lining was studied, and the coupled thermal-structure effect on stator rubber lining was analyzed with the finite element simulation. The temperature field distribution characteristics, thermal stress and strain law were analyzed. The effects of rubber hardness, Poisson ratio, static pressure, rotor speed, strata temperature and differential pressure on temperature change were studied. The results show that higher temperature leads to greater heat stress and deformation of rubber lining. The lining non-uniform temperature field is in symmetrical ellipse and there is a greater temperature gradient. The rise of temperature, the largest thermal stress and deformation decrease with the increase of the rubber hardness, Poisson ratio and strata temperature, and increase with the increase of the static pressure and differential pressure. The analysis results are proved to be correct and reliable compared with the field failure cases. Source
Luo X.-L.,China University of Petroleum - Beijing |
Gu Y.-H.,Kingdream Public Ltd Company |
Liu C.-L.,China University of Petroleum - Beijing |
Qin R.,China National Offshore Oil Corporation |
And 2 more authors.
China Ocean Engineering | Year: 2014
The tubing hanger is an important component of the subsea Christmas tree, experiencing big temperature difference which will lead to very high thermal stresses. On the basis of API 17D/ISO 13628-4 and ASME VIII-1, and by comprehensively considering the erosion of oil and the gravity load of the tubing, a calculation model is established by regarding design pressure and thermal stress, and the method for designing the tubing hanger of the horizontal Christmas tree under big temperature difference condition is developed from the fourth strength theory. The proposed theory for strength design of the tubing hanger in big temperature difference is verified by numerical results from ABAQUS. © 2014, Chinese Ocean Engineering Society and Springer-Verlag Berlin Heidelberg. Source
Wang G.,Southwest Petroleum University |
Zhu H.,Southwest Petroleum University |
Zhu H.,Kingdream Public Ltd Company |
Liu Q.,Southwest Petroleum University |
He C.,Drilling and Production Technology Research Institute
Huazhong Keji Daxue Xuebao (Ziran Kexue Ban)/Journal of Huazhong University of Science and Technology (Natural Science Edition) | Year: 2010
The dynamic parameters of gas-drilling hole-bottom were calculated. An actual physical model of the hole-bottom flow field of air hammer bit was built, after the effects of junk slots and cutters on the flow field at the well bottom were analyzed. The flow field, pressures one and temperature one of the designed 12 1/4″ air hammer bit located in a 3000 m depth well were simulated by the computational fluid dynamics (CFD) software. The results indicate the patterns of flow, pressure and temperature fields are reasonable; the flow field can clean and cool the bit teeth quickly. The simulation results coincide with the results calculated by empirical formula of air drilling precisely, which could be used to guide the optimizing design of air hammer bit and the development of new product, conducive to further promote the wide applications of the air hammer bit and air drilling technology. Source
Kingdream Public Ltd. Co. | Date: 2014-01-07
A tricone rock bit for horizontal wells and hard formation wells includes three head sections and three cones arranged at the lower ends of the head sections, where the supper parts of the three head sections are connected together to form one integrated drill bit body; jet nozzle bosses are arranged between the head sections on the drill bit body; jet nozzles are mounted in nozzle holes of the jet nozzle bosses; gauge cutting elements are arranged on the top rear of the OD of the head sections, forming a gauge surface on the top of the head sections; the front face of the head sections is a ruled surface, inclining backwards at an angle , and inclining outwards at an angle . The tricone rock bit has low lateral vibrations, high stability, good effects of bottom hole cleaning and cutting element cooling, long service life and high penetration rate.
Kingdream Public Ltd. Co. | Date: 2010-05-27
This invention relates to carbide inserts used on roller cone bits for oil and gas drilling applications as well as for other geological drilling applications, and more specifically, relates to the convex crested insert with deflected wedge surfaces. The insert comprises a cylindrical portion and a crest portion. Said crest portion is composed of a conical crest base, a top surface and two opposing wedge surfaces. Upper ends of the two wedge surfaces are merged smoothly with top surface of the insert. The specific feature of the structure is that top surface of the crest portion is convexed outwardly and forms a smooth curve surface which is higher in the middle and lowers down gradually to each end. Said two wedge surfaces are slant wedge surfaces, so that a width of the top surface and therefore a width of the insert crest are tapered from one end to the other. Advantages of this invention include: 1. Help for rock breaking and therefore, it can increase drilling efficiency of the cutters and lower the overall drilling cost; 2. higher anti-breakage capability and longer working life; and 3. when inserts of this invention are used as heel row cutting elements on bit, contact area between wider end of the top surface of the insert and borehole wall is larger and therefore the gouging action applied on the borehole wall is higher and can also achieve better gage protection of the bit.