The Experts below are selected from a list of 99 Experts worldwide ranked by ideXlab platform

Jiwei Wu - One of the best experts on this subject based on the ideXlab platform.

  • Analysis on mechanical influencing factors of fatigue behavior for the packer on pipe ram in Snubbing Unit
    Engineering Failure Analysis, 2019
    Co-Authors: Ting Chen, Weiguo Ma, Jiwei Wu
    Abstract:

    Abstract In Snubbing service, the ram blowout preventer (BOP) is switched frequently, and the stress condition of the packer is very complicated. Cracks, rubber drop, and other fatigue failures often occur. The load characteristic was firstly analyzed in this paper based on the stress condition of packer in Snubbing service. The mechanical property of rubber commonly used for packer was tested, and the performance parameters were obtained. Based on the crack initiation approach, taking the rubber matrix as the research object, the effective stress, the maximum Green–Lagrange strain and strain energy density were selected as damage parameters. The distribution contour of three damage parameters of the rubber matrix of the packer under different stress conditions and speeds of lifting or lowering pipe were obtained using finite element method (FEM). The effect of different stress conditions and speeds of lifting or lowering pipe on the fatigue behavior for the rubber matrix was analyzed. The result shows that the value of three damage parameters is relatively high on the upper area of the rubber matrix, causing the first occurrence of fatigue in the upper part, which agrees well with the oilfield application. The speed of the pipe does not change the location of fatigue point and the value of damage parameters, so that it has little effect on the fatigue behavior of the packer's rubber matrix. Finally, based on Miner linear damage rule, a calculation method for the fatigue behavior of the packer is presented.

  • Analysis on mechanical influencing factors of fatigue behavior for the packer on pipe ram in Snubbing Unit
    Engineering Failure Analysis, 2019
    Co-Authors: Ting Chen, Weiguo Ma, Jiwei Wu
    Abstract:

    Abstract In Snubbing service, the ram blowout preventer (BOP) is switched frequently, and the stress condition of the packer is very complicated. Cracks, rubber drop, and other fatigue failures often occur. The load characteristic was firstly analyzed in this paper based on the stress condition of packer in Snubbing service. The mechanical property of rubber commonly used for packer was tested, and the performance parameters were obtained. Based on the crack initiation approach, taking the rubber matrix as the research object, the effective stress, the maximum Green–Lagrange strain and strain energy density were selected as damage parameters. The distribution contour of three damage parameters of the rubber matrix of the packer under different stress conditions and speeds of lifting or lowering pipe were obtained using finite element method (FEM). The effect of different stress conditions and speeds of lifting or lowering pipe on the fatigue behavior for the rubber matrix was analyzed. The result shows that the value of three damage parameters is relatively high on the upper area of the rubber matrix, causing the first occurrence of fatigue in the upper part, which agrees well with the oilfield application. The speed of the pipe does not change the location of fatigue point and the value of damage parameters, so that it has little effect on the fatigue behavior of the packer's rubber matrix. Finally, based on Miner linear damage rule, a calculation method for the fatigue behavior of the packer is presented.

Ting Chen - One of the best experts on this subject based on the ideXlab platform.

  • Analysis on mechanical influencing factors of fatigue behavior for the packer on pipe ram in Snubbing Unit
    Engineering Failure Analysis, 2019
    Co-Authors: Ting Chen, Weiguo Ma, Jiwei Wu
    Abstract:

    Abstract In Snubbing service, the ram blowout preventer (BOP) is switched frequently, and the stress condition of the packer is very complicated. Cracks, rubber drop, and other fatigue failures often occur. The load characteristic was firstly analyzed in this paper based on the stress condition of packer in Snubbing service. The mechanical property of rubber commonly used for packer was tested, and the performance parameters were obtained. Based on the crack initiation approach, taking the rubber matrix as the research object, the effective stress, the maximum Green–Lagrange strain and strain energy density were selected as damage parameters. The distribution contour of three damage parameters of the rubber matrix of the packer under different stress conditions and speeds of lifting or lowering pipe were obtained using finite element method (FEM). The effect of different stress conditions and speeds of lifting or lowering pipe on the fatigue behavior for the rubber matrix was analyzed. The result shows that the value of three damage parameters is relatively high on the upper area of the rubber matrix, causing the first occurrence of fatigue in the upper part, which agrees well with the oilfield application. The speed of the pipe does not change the location of fatigue point and the value of damage parameters, so that it has little effect on the fatigue behavior of the packer's rubber matrix. Finally, based on Miner linear damage rule, a calculation method for the fatigue behavior of the packer is presented.

  • Analysis on mechanical influencing factors of fatigue behavior for the packer on pipe ram in Snubbing Unit
    Engineering Failure Analysis, 2019
    Co-Authors: Ting Chen, Weiguo Ma, Jiwei Wu
    Abstract:

    Abstract In Snubbing service, the ram blowout preventer (BOP) is switched frequently, and the stress condition of the packer is very complicated. Cracks, rubber drop, and other fatigue failures often occur. The load characteristic was firstly analyzed in this paper based on the stress condition of packer in Snubbing service. The mechanical property of rubber commonly used for packer was tested, and the performance parameters were obtained. Based on the crack initiation approach, taking the rubber matrix as the research object, the effective stress, the maximum Green–Lagrange strain and strain energy density were selected as damage parameters. The distribution contour of three damage parameters of the rubber matrix of the packer under different stress conditions and speeds of lifting or lowering pipe were obtained using finite element method (FEM). The effect of different stress conditions and speeds of lifting or lowering pipe on the fatigue behavior for the rubber matrix was analyzed. The result shows that the value of three damage parameters is relatively high on the upper area of the rubber matrix, causing the first occurrence of fatigue in the upper part, which agrees well with the oilfield application. The speed of the pipe does not change the location of fatigue point and the value of damage parameters, so that it has little effect on the fatigue behavior of the packer's rubber matrix. Finally, based on Miner linear damage rule, a calculation method for the fatigue behavior of the packer is presented.

Weiguo Ma - One of the best experts on this subject based on the ideXlab platform.

  • Analysis on mechanical influencing factors of fatigue behavior for the packer on pipe ram in Snubbing Unit
    Engineering Failure Analysis, 2019
    Co-Authors: Ting Chen, Weiguo Ma, Jiwei Wu
    Abstract:

    Abstract In Snubbing service, the ram blowout preventer (BOP) is switched frequently, and the stress condition of the packer is very complicated. Cracks, rubber drop, and other fatigue failures often occur. The load characteristic was firstly analyzed in this paper based on the stress condition of packer in Snubbing service. The mechanical property of rubber commonly used for packer was tested, and the performance parameters were obtained. Based on the crack initiation approach, taking the rubber matrix as the research object, the effective stress, the maximum Green–Lagrange strain and strain energy density were selected as damage parameters. The distribution contour of three damage parameters of the rubber matrix of the packer under different stress conditions and speeds of lifting or lowering pipe were obtained using finite element method (FEM). The effect of different stress conditions and speeds of lifting or lowering pipe on the fatigue behavior for the rubber matrix was analyzed. The result shows that the value of three damage parameters is relatively high on the upper area of the rubber matrix, causing the first occurrence of fatigue in the upper part, which agrees well with the oilfield application. The speed of the pipe does not change the location of fatigue point and the value of damage parameters, so that it has little effect on the fatigue behavior of the packer's rubber matrix. Finally, based on Miner linear damage rule, a calculation method for the fatigue behavior of the packer is presented.

  • Analysis on mechanical influencing factors of fatigue behavior for the packer on pipe ram in Snubbing Unit
    Engineering Failure Analysis, 2019
    Co-Authors: Ting Chen, Weiguo Ma, Jiwei Wu
    Abstract:

    Abstract In Snubbing service, the ram blowout preventer (BOP) is switched frequently, and the stress condition of the packer is very complicated. Cracks, rubber drop, and other fatigue failures often occur. The load characteristic was firstly analyzed in this paper based on the stress condition of packer in Snubbing service. The mechanical property of rubber commonly used for packer was tested, and the performance parameters were obtained. Based on the crack initiation approach, taking the rubber matrix as the research object, the effective stress, the maximum Green–Lagrange strain and strain energy density were selected as damage parameters. The distribution contour of three damage parameters of the rubber matrix of the packer under different stress conditions and speeds of lifting or lowering pipe were obtained using finite element method (FEM). The effect of different stress conditions and speeds of lifting or lowering pipe on the fatigue behavior for the rubber matrix was analyzed. The result shows that the value of three damage parameters is relatively high on the upper area of the rubber matrix, causing the first occurrence of fatigue in the upper part, which agrees well with the oilfield application. The speed of the pipe does not change the location of fatigue point and the value of damage parameters, so that it has little effect on the fatigue behavior of the packer's rubber matrix. Finally, based on Miner linear damage rule, a calculation method for the fatigue behavior of the packer is presented.

R.j. Tailby - One of the best experts on this subject based on the ideXlab platform.

  • Pumpdown assistance extends coiled tubing reach
    1992
    Co-Authors: R.j. Tailby
    Abstract:

    One of the most challenging coiled tubing applications to emerge in the last few years is horizontal well maintenance. When wireline cannot be used, techniques that offer some of the same flexibility, availability and relatively low cost must be used. During this same period, however, drilling technology has also made huge strides in horizontal and extended-reach areas. Wells are now being drilled with horizontal lengths in excess of 6,000 ft and measured depths of more than 22,000 ft. This paper reports that although horizontal wells are definitely here to stay, many operators have had to reevaluate their positions after being confronted with the problem of recompleting these wells to eliminate excessive water or gas production. A full workover with workstring using either a drilling rig or Snubbing Unit can be expensive and may lead to lost production because of limited rig availability. Coiled tubing has successfully been used in most cases thus far, but it has length and horizontal reach limitations that drilling technology will soon overtake. Within the constraints of current technology and tube capabilities, coiled tubing does not have the buckling resistance or reel capacity to service today's longest horizontal and extended reach wells or those planned andmore » foreseen in the future. Even if coiled tubing can reach TD, operations requiring downward force are severely restricted.« less

Lin Ning - One of the best experts on this subject based on the ideXlab platform.

  • Discussion on Typical Hydraulic Snubbing Unit for Running and Pulling Tubing Operations
    Oil Field Equipment, 2012
    Co-Authors: Lin Ning
    Abstract:

    Based on the development status of domestic and international Snubbing Units,more detailed analysis was made on the structure and working principle of a typical hydraulic Snubbing Unit while running and pulling tubing and the components and main performance characteristics of hydraulic drive systems.Aiming at existing problems on control system of hydraulic running and pulling tubing equipment,a thought of control system of hydraulic running and pulling tubing equipment based on PLC were proposed,which provided a theoretical help to people make a further study and research for hydraulic Snubbing Units with excellent performance.