A Method for Optimizing Steering Trajectories of Horizontal Well Logging

A technology for trajectory optimization and horizontal wells, applied in directional drilling and other directions, can solve the problems of increased target distance, increased wellbore friction, frequent trajectory fluctuations, etc., to enhance mechanical extension capability, increase ROP, reduce The effect of drilling risk

Inactive Publication Date: 2015-11-04
CNPC BOHAI DRILLING ENG
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Problems solved by technology

[0003]The disadvantage of the above method is that there are two more inflection points in the trajectory segment before landing, and the target distance is increased; Causes frequent ups and downs in trajectory
As a result, the wellbore trajectory is not smooth, and the friction of the wellbore increases, which increases the difficulty and even the risk of subsequent construction.

Method used

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  • A Method for Optimizing Steering Trajectories of Horizontal Well Logging
  • A Method for Optimizing Steering Trajectories of Horizontal Well Logging

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Embodiment Construction

[0023] A method for optimizing the steering trajectory of horizontal well logging provided by the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0024] Such as figure 1 As shown, track change point A, original target point B, moving point C, new target point D, track 1 drilled before track change, track 2 to be drilled before track change, new track 3, track radius R before track change 1 , the trajectory arc center O before orbit change 1 , the new trajectory radius R 2 , the arc center O of the new trajectory 2 。

[0025] Such as figure 2 As shown, trajectory peak control line 11, trajectory bottom control line 12, trajectory control points E, F, G, trajectory control point E to F arc 4, trajectory control point F to G arc 5, trajectory control point Arc center O between E and F 3 , arc radius R between trajectory control point E and F 3 , arc center O between trajectory contr...

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Abstract

The invention belongs to the technical field of horizontal well logging guidance, and discloses a method for optimizing the trajectory of horizontal well logging guidance. Its main technical features are: the trajectory optimization before landing includes three steps: determining the position of the new target point, calculating the radius of the new trajectory, and designing the trajectory of the new target point; after entering the layer, the trajectory optimization includes setting the peak and valley control line, establishing the trajectory control point, establishing There are three steps: the first section of trajectory, the establishment of the second section and subsequent sections of trajectory. The method for optimizing the steering trajectory of horizontal well logging provided by the present invention realizes the overall smoothness of the horizontal well trajectory, effectively controls the target distance, reduces the friction between the drilling tool and the well wall, and improves the ROP. The drilling cycle is shortened and good conditions are created for subsequent construction.

Description

technical field [0001] The invention belongs to the technical field of horizontal well logging guidance, and in particular relates to a method for optimizing a horizontal well logging guidance trajectory. Background technique [0002] From the deflection to the bottom of the horizontal well, the trajectory of the wellbore can be divided into two stages: before landing and in the layer. At present, the widely used method is: in the first stage, before landing, go down according to the designed trajectory, and when the angle difference is reduced to about 5 degrees , go down steadily and obliquely to find the layer, uncover the target layer, and then turn flat to enter the target; after entering the layer in the second stage, the line connecting two adjacent target points is used as the design trajectory, and the drill bit is made to travel as close to a straight line as possible through frequent small-scale orientation. [0003] The disadvantage of the above method is that th...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B7/04
Inventor 周文君吴章武李金顺成萍
Owner CNPC BOHAI DRILLING ENG
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