Method for optimizing well drilling sequence of offshore cluster well group

Abstract

The present invention discloses a method for optimizing a well drilling sequence of an offshore cluster well group. The method includes a well drilling sequence optimizing index, an optimizing model and a genetic algorithm solution, specially includes the steps as follows: presetting a well trajectory design scheme (containing wellhead groove parameters) of the whole well group; performing interpolation calculation (separation distance 1m), coordinate transformation, and minimum range sweep analysis for all designing trajectories; giving a measure error to all designing trajectories so as to calculate error ellipsoid parameters corresponding to all interpolating points; performing a well colliding risk analysis for the whole well group (calculating a well separation coefficient); building a well drilling sequence optimal object matrix and a mathematical programming model; solving the model by utilizing a genetic algorithm; and analyzing data by synthesis (giving consideration to a batch drilling requirement). The optimized well drilling sequence facilitates reducing the well colliding risk and an anti-colliding workload, facilitates saving a well drilling time and a well drilling cost by utilizing the batch well drilling method, and satisfies the requirement for optimizing the drilling sequence of the offshore large-scale cluster well group.

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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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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