Funicular curve well drilling rail design method using stratum natural deflecting rule

A design method and catenary technology, applied in directional drilling and other directions, can solve the problems of not considering the natural deflection law of the formation, unfavorable for wellbore trajectory control, and unable to give the size of the azimuth advance angle.

Active Publication Date: 2008-05-07
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

However, in the existing catenary drilling method, the well trajectory is designed as a two-dimensional section, without considering the influence of the natural deflection law of the formation, which is quite different from the actual situation of the drilling project.
Not only can the azimuth lead angle not be given, but the comparability between the actual three-dimensional trajectory and the designed two-dimensional trajectory is poor, which is not conducive to the wellbore trajectory control during drilling construction

Method used

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  • Funicular curve well drilling rail design method using stratum natural deflecting rule
  • Funicular curve well drilling rail design method using stratum natural deflecting rule
  • Funicular curve well drilling rail design method using stratum natural deflecting rule

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Embodiment 1

[0147] Target vertical depth H of an extended-reach well t =2800m, horizontal displacement A t =6000m, kickoff point depth ΔL 1 =300m, and above the kickoff point is the vertical well section, namely α 1 = 0°. Such as figure 1 As shown in the figure, ob segment is the stabilizing segment, bc segment is the arc segment, cd segment is the catenary segment, and dt segment is the stabilizing segment.

[0148] If the build-up slope of the arc transition section is κ 2 =10° / 30m, the initial inclination angle and the end inclination angle of the stabilizing section are α 2 = 42° and α 4 =78°, the wellbore trajectory is designed by adopting the catenary wellbore section.

[0149] According to the computing method of the present invention, get: during two-dimensional design,

[0150] The characteristic parameter of the catenary well section is a=3569.85m,

[0151] Section length ΔL of stabilizing section 4 =3364.55m,

[0152] Segment length ΔL of catenary section 3 = 3205....

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Abstract

The invention relates to a drilling engineering design in the petroleum drilling engineering, in particular to wellbore trajectory optimized design and control in the highly-displacement well. For three-stage and four-stage catenary sections, the design of wellbore trajectory is finished through 12 steps. The invention puts forward a new method of two-dimensional catenary trajectory design. A plurality of units with different azimuth wander ratio is divided according to natural deviating rule of formation, which is combined to the formation condition that conforms to the actual situations of drilling engineering. On the basis of maintaining the characteristics and advantages of catenary trajectory and regarding to the influence of natural deviating rule of formation, a method of three-dimensional catenary trajectory design is put forward, which can not only scientifically work out the azimuth lead angle and initial azimuth, but also work out the trajectory parameters of every point inthe wellbore trajectory. The realization of three-dimensional wander trajectory design of catenary section has real meaning of guidance for the drilling design and construction of the highly-displacement well. The invention is used in the field of petroleum and geological exploration.

Description

technical field [0001] The invention relates to the drilling engineering design in the petroleum drilling engineering, in particular to the optimal design and control of the borehole trajectory of the extended displacement well. Background technique [0002] Extended reach wells have the advantages of large horizontal displacement, wide controlled production area, long well section drilled through oil layers, large oil drainage area, high recovery rate and high single well production. When developing oil reservoirs with the same oil-bearing area, offshore drilling can be greatly reduced. The number of platforms and artificial islands saves a lot of investment. Since the 1990s, extended-reach wells have been popularized and applied all over the world, especially in the development of offshore platforms and offshore oil and gas fields, and have achieved huge economic benefits. [0003] How to reduce the friction and torque of the drill string is a key technology to achieve ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/06
Inventor 刘修善
Owner CHINA PETROLEUM & CHEM CORP
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