Drilling sequence optimization method for offshore cluster wells
A sequence optimization and cluster well technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the lack of mathematical optimization models and efficient solution methods, the lack of drilling sequence optimization evaluation indicators, and the difficulty of taking into account anti-collision and Reliable drilling sequence optimization results, reducing the difficulty and workload of anti-collision construction, saving drilling time and drilling costs
Active Publication Date: 2017-02-15
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology
[0003] The traditional drilling sequence optimization methods for offshore cluster wells mainly have the following disadvantages: (1) There are only anti-collision and batch drilling optimization principles, and the drilling sequence is selected based on experience and manual; (2) The lack of evaluation indicators for drilling sequence optimization makes it difficult to Several "feasible solutions" are evaluated and optimized, and it is difficult to take into account the requirements of anti-collision and batch drilling; (3) lack of mathematical optimization models and efficient solution methods, when there are many wells to be drilled (not less than 10 wells), no "optimal solution" can be found. untie"
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[0050] With reference to the accompanying drawings, a method for optimizing the drilling sequence of an offshore cluster well group comprises the following steps:
[0051] (1) The wellbore trajectory design scheme of the entire well group is given, and the given wellbore trajectory is recorded as trajectory A; the scheme contains all the design trajectory and wellhead groove parameters.
[0052] (2) Borehole interpolation analysis: The borehole interpolation method is used to perform interpolation calculation on track A (the interpolation point spacing is 1.0m), and the interpolated track is recorded as track B.
[0053] (3) Coordinate transformation: transform orbit B into a coordinate system with a reference point (the center of the platform, or the center of a wellhead slot) as the origin to obtain orbit C. The coordinate conversion formula is shown in formula (6):
[0054]
[0055] In the above formula, X 0, Y 0 ,Z 0 is the geodetic coordinate corresponding to the d...
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The invention discloses a method for optimizing the drilling sequence of an offshore cluster well group. The method includes the optimization index of the drilling sequence, an optimization model and a genetic algorithm solution. Groove parameters); perform interpolation calculation (1m spacing), coordinate conversion, and shortest distance scanning analysis on all designed orbits; assign measurement errors to all designed orbits, and calculate error ellipsoid parameters corresponding to all interpolation points; Wellbore collision risk analysis (calculation of wellbore separation coefficient); construction of drilling sequence optimization target matrix and mathematical programming model; use of genetic algorithm to solve the model; comprehensive analysis (considering the requirements of batch drilling). The drilling sequence optimized by this method helps to reduce the risk of wellbore collision and anti-collision workload, and also helps to adopt the batch drilling method to save drilling time and drilling cost, and meets the optimization requirements of drilling sequence for large offshore cluster well groups.
Description
technical field [0001] The invention relates to the field of offshore oil drilling engineering, in particular to a method for optimizing the drilling sequence of a large offshore cluster well group. Background technique [0002] There are many offshore cluster wells to be drilled and the wellhead spacing is small. Optimizing the drilling sequence is of great significance to both development and drilling. It not only helps to confirm reserves and reservoirs, reduces development risks, but also helps to prevent collisions and batch drilling homework, saving platform time. When the development department does not specify the drilling sequence, the drilling department mainly optimizes the drilling sequence based on anti-collision and batch drilling requirements. Existing literature only gives the principle of drilling sequence optimization, but has not given the corresponding optimization index and optimization model. For example, when considering anti-collision requirements, ...
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IPC IPC(8): G06F17/50
Inventor 史玉才薛磊管志川廖华林席传明初众张晨苗在强
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)