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  • Open Access

    ARTICLE

    Analysis and Design of Coiled Tubing Drilling Downhole Instrument Bus

    Tao Liu1, Kai Shuang1, Hongming Cai1
    Structural Longevity, Vol.10, No.1, pp. 1-10, 2013, DOI:10.3970/sl.2013.010.001
    Abstract In consideration of high transmission rate and high reliability of the coiled tubing drilling measuring instrument, through comparison with the MILSTD-1553B bus protocol, we proposed a modified CAN version to improve the CAN bus as data transmission scheme for underground communication bus. Comparing the 1553 bus with CAN bus in terms of their basic principles, characteristics and formats of data, the feasibility of CAN bus as underground transmission bus is analyzed. In order to meet the demand of small size coiled tubing instrument, the design of CAN bus controller based on FPGA technology and the improvement of CAN bus protocol… More >

  • Open Access

    ARTICLE

    Effect of Gas-wetting on Dispersing Properties of Clay Minerals in Condensate Gas Reservoir

    G. C. Jiang1,2, Y. Y. Li1,2
    Structural Longevity, Vol.10, No.1, pp. 11-17, 2013, DOI:10.3970/sl.2013.010.011
    Abstract The condensate gas reservoir output could be enhanced significantly with the gas-wetting reversal FC-1. However, changes in the wettability have been shown to affect dispersion properties of clay minerals in condensate gas reservoir. With the gas-wetting realized on the montmorillonite (MMT), zeta potential and cation exchange capacity (CEC) change with wettability reversion were studied in this paper, and the mechanism of it was also analyzed. The zeta potential of 100 ∼ 200 mesh MMT reached to -17.27mV and gradually approached to nondispersion condition; with FC-1 concentration increased, CEC decreased sharply from 2.14 to 0.2. The microstructure of MMT was analyzed… More >

  • Open Access

    ARTICLE

    Effect of Gas-wetness on Gas-water Two-phase Seepage in Visual Microscopic Pore Models

    G. C. Jiang1,2, M. Zhang1,2, X. X. Xing3, S. J. Luo1,2, J. T. Pang1,2
    Structural Longevity, Vol.10, No.1, pp. 19-26, 2013, DOI:10.3970/sl.2013.010.019
    Abstract Theoretical analyses and experimental results show that gas wettability plays an important role on gas-well production. In the study, the gas-wet ability parameter of gas vs. liquid ζG-L, calculated from the proposed formula in the sessile drop method, used to measure gas wettability of microscopic pore models treated by fluorocarbon polymer Zonyl8740. Following that, the effect of gas-wetness on gas-water two-phase seepage in models was studied by stereomicroscope with a camera. Research results show that, under the condition of the pore structure is constant and displacement velocity is very slow, capillary force is the main motivation for two-phase seepage, and… More >

  • Open Access

    ARTICLE

    A Novel Method for the Design of Desirable Yield Point Range of Drilling Fluid

    Yao Rugang1,2, Jiang Guancheng1,2, Li Wei1,2, Wang Yuzhe1,2, Fan Jin1,2
    Structural Longevity, Vol.10, No.1, pp. 27-35, 2013, DOI:10.3970/sl.2013.010.027
    Abstract The objectives of this paper are to report a novel method for the design of desirable yield point range of drilling fluid, which take consider of the needs for drilling engineering and the principles of carry and suspend formation cuttings. The calculation model was derived using solid-liquid dynamics under certain given assumptions such as well structures, drilling fluid densities, depth, and etc., and corresponding software was developed in c#. Then, relationship between plastic viscosity and yield point has been expounded. For brevity, under the premise of no sedimentation, any one of the drilling fluid density, pump discharge, plastic viscosity and… More >

  • Open Access

    ARTICLE

    A Semi-Analytical Models to Investigate Performance of Herringbone Wells

    Guoqing Han1, Xiaodong Wu1, He Zhang2, Shubao Tian1
    Structural Longevity, Vol.10, No.1, pp. 37-48, 2013, DOI:10.3970/sl.2013.010.037
    Abstract For herringbone wells with antisymmetrical and curved laterals, the effects of lateral symmetry and camber on production of herringbone wells are analyzed by semi-analytical model. The effects of laterals with different angles, different number and different spans on production of herringbone wells are analyzed on this base. The results indicate that the contribution of mainbore of production is smaller than symmetrical herringbone well whereas the contribution of laterals of antisymmetrical herringbone well is bigger. The total production of antisymmetrical herringbone well is bigger than that of symmetrical herringbone well. The curved laterals will cause less production comparing with deviated laterals.… More >

  • Open Access

    ARTICLE

    Study and Application of Waterflood Reservoir Protection Technology in Developing Low Permeability Reservoirs

    Shuo Zhang1, Guan-Cheng Jiang1, Le Wang1, Hai-Tao Guo2, Jin Hai-feng2, Dian-Gang Bai2, Cong-Yue Shi2
    Structural Longevity, Vol.10, No.1, pp. 49-57, 2013, DOI:10.3970/sl.2013.010.049
    Abstract Developing low and extra-low permeability reservoirs becomes more and more important to the sustainable energy development in China and waterflood development is the common development mode. But with the oilfield development, water injection well has also exposed some questions gradually, such as the injection pressure increases, water injection rate decreases and so on. We proposed a new reservoir protection technology by adding new anti-swelling agent NTW-1 and fluorocarbon surfactant FCS-08 in the injection water. NTW-1 has good antiswelling ability and FCS-08 could change rock surface to neutral wetting. After successful field application in ShengLi oilfield in china, water injection pressure… More >

  • Open Access

    ARTICLE

    Research on Influence Rules of Pore Structure on Water & Polymer Flooding using Etched Glass Micro-model

    Yuan Ying-jie1,2, Hou Ji-rui1, Zhao Feng-lan1, Yu Chun-sheng3, Zhang Feng-min1,2
    Structural Longevity, Vol.10, No.1, pp. 59-70, 2013, DOI:10.3970/sl.2013.010.059
    Abstract In this paper, visual micro-model technology has been applied to investigate the influence rules of pore structure on water and polymer flooding, by observing multiphase flow in porous media under the ZEISS 2000-C microscopy. To make the transparent etched glass micro-model representative, the image of target reservoir layer from Shuanghe Oil field, was selected by using laser confocal scanning technology. To ensure effective flow, pore channels with dead-end were gotten through artificially, then the fine-adjustment-image was etched into two glass plates and a specific cementing process was used. The main characteristic of this micro-model is that it preserves the typical… More >

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