Abstract

In assam in India sidetrack well was decided to do horizontally after side tracking in l profile and after 90horizontal section. Original well was S profile in casing above. Well was decided for construction it was observed after torque and drag analysis that s profile l profile and horizontal section creates more surface torque. Surface torque generation was more and well was not taken for horizontal well and was converted to high angle well.

In another case well was taken up for ultrashot radius and top section of casing was S profile and only vertical wells were taken for ultrashot wells .s profile and horizontal section it was measured from out put of software generates almost double the torque.

Torque generated prognosis is a indication of wells not to be taken for drilling and well configuration was changed many viable software is available. Friction and drag is dependent on many factors like mud type well angle well profile, type of assembly used. Software modeling of well provides accurate prediction of performance and feasibility of wells. Depending on software calculation new well construction can be designed and can be altered.

Above two case study outline prevented operator from doing horizontal well and ultrashot well. Similarly many output calculation can be done like failure in tension in compression and rotational in different set of drilling condition and preventive measure may be taken for unfavourable condition.

INTRODUCTION
  • Torque and drag modeling is a simulation of well planning stage to calculate risk and uncertainty of well bore geometry. Directional and horizontal well requires precisely well bore friction torque and drag. Friction in well bore will depend on well path, well curvature, mud and formation. If well bore is vertical, friction factor will be less. Due to high friction, well profile drag and torque increases and in planning phase well bore geometry can give an accurate measurement of bore hole torque and drag. If in any calculation modeling of torque and drag, any hazard is observed in output parameter, well design can be altered due to high investment risk, rig cost, safety. Well is planned to completion stage starting from drilling to completion. torque and drag software can create simulation of drilling and all casing lowering and compleation string setting.

Well design can predict in planning stage the surface torque, failing from tension, buckling from compression failing from rotational torque. A different well plan alternatively can be devised.S profile on the top of well and below L profile and to 90 landing point. Well path was generated and modeling was done using torque and drag soft ware, it was observed that static torque of horizontal well was much greater than the static torque in high angle well.

Considering well development and field development to achieve maximum production horizontal well is to be done but because of increase in risk and uncertainity and higher torque was in well planning stage was predicted. by software Well engineer can use this tool for successful drilling strategy. If the modeling insists that there is a critical problem then well engineer can alter the design acording to suitability of the well

SOLUTION - Torque and drag modeling is the solution of this problem. By input of various factors like directional plan, drill string data, cased hole data, open hole data it is possible to predict of lowering of tubulars and consequence and different drilling operation scenarios is achieved.

DRILLING SOFTWARE -Drilling software includes tubular data. Pipe OD/ID, pipe density, young modulus tensional yield, torsional yield, weight per ft tensile strength and torsional data is key input

Directional profile of the well is measured depth, inclination, azimuth.

Output calculation are done under different set of condition

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