Method for monitoring friction drag and torque of large-displacement well

A technology for extended-reach wells and torque resistance, which is used in surveying, earthmoving, wellbore/well components, etc. It can solve the problems of immature real-time monitoring of friction torque and torque, and achieve the effect of broadening the application range.

Inactive Publication Date: 2015-04-29
CHINA PETROCHEMICAL CORP +1
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Problems solved by technology

Real-time monitoring of frictional torque during drilling is not yet mature

Method used

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  • Method for monitoring friction drag and torque of large-displacement well
  • Method for monitoring friction drag and torque of large-displacement well
  • Method for monitoring friction drag and torque of large-displacement well

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Embodiment Construction

[0048] Attached below Figure 1-5 This design method is further explained.

[0049] (1) According to the characteristics of extended-reach wells, the calculation of friction torque of extended-reach well strings is divided into five parts, and the corresponding mechanical models are established: For the drill pipe section of the straight well section, due to the small change in borehole curvature, the soft pipe model of the extended reach well is established by ignoring the influence of the stiffness of the drill string; The curvature of the wellbore in the build-up section is large, and the drill string is prone to bending to cause large bending stress. In order to make the calculation more accurate, a rigid rod model is used; In the stabilizing section, the borehole curvature changes little, and the drill string is generally a drill pipe with low bending stiffness, so the soft rod model is adopted; Increase the weight of the drill pipe section, ignoring the influence o...

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Abstract

The invention provides a method for monitoring the friction drag and the torque of a large-displacement well. The method comprises the steps of firstly, building a friction drag and torque mechanical analysis model of the large-displacement well, and compiling an analysis program or analysis software; secondly, carrying out friction drag and torque simulation analysis computing under a track section designing condition; compiling monitoring route maps of drilling tool feed-off hook load, drilling tool lift-up hook load and idling lift-off-well bottom hook load under different friction drag coefficient conditions and route maps of rotary drilling torque along with well depth; recording the drilling tool feed-off hook load, the drilling tool lift-up hook load, the idling lift-off-well bottom hook load and the rotary drilling torque of actual drilling during site operation; finally, describing data under actual drilling record on the route maps, and comparing the data with predicted values under different friction drag coefficients and analyzing. According to the method for monitoring the friction drag and the torque of the large-displacement well, provided by the invention, the reason that causes the friction drag and the torque is deeply analyzed through real-time monitoring on the friction drag and the torque, and meanwhile, response analysis is carried out on the borehole cleanliness degree, the borehole quality, the drilling parameters, a bottom drilling tool combination, the drilling fluid performance change, the use of an anti-friction and torque-reducing tool and the like.

Description

technical field [0001] The invention relates to a friction torque monitoring method for extended-reach wells in the technical field of drilling construction monitoring. Background technique [0002] In recent years, with the continuous expansion of human exploration and development of offshore oil and gas, more and more extended-reach wells are drilled with offshore drilling platforms and artificial islands. The problem has become the most prominent restricting factor in extended-reach wells, and the monitoring and control of frictional torque is the key to successfully drilling an extended-reach well. [0003] At present, the analysis of frictional torque is still in the prediction stage, and it is mainly used for the necessity analysis and target research of drilling equipment upgrade before oil and gas well construction, the feasibility analysis of oil and gas well construction, the comparative analysis and optimization of technical measures and schemes, etc. . The real...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/00
CPCE21B47/00
Inventor 杨春旭孙铭新冯光通唐洪林董广华胥豪刘晓兰夏文安刘永亮徐文浩曲其勇
Owner CHINA PETROCHEMICAL CORP
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