Drilling parameter optimization method based on plastic energy dissipation ratio

Abstract

The invention discloses a drilling parameter optimization method based on a plastic energy dissipation ratio. The method comprises the following steps that: S1: according to the mechanical models of plastic fracture and brittle fracture in a well drilling rock cutting process, independently establishing a mechanical specific work calculation model under the situations of the plastic fracture and the brittle fracture of rock; S2: utilizing the mechanical specific work calculation model under the situations of the plastic fracture and the brittle fracture of the rock, carrying out combination toobtain a mechanical specific work final calculation model; S3: on the basis of the mechanical specific work final calculation model, establishing a plastic energy dissipation ratio calculation model;S4: through a cutting test, obtaining parameters in the plastic energy dissipation ratio calculation model; S5: solving the plastic energy dissipation ratios under different cutting depths by the plastic energy dissipation ratio calculation model; and S6: comparing the plastic energy dissipation ratios under different cutting parameters, optimizing the optimal cutting parameter. By use of the method, the optimal cutting parameter can be optimized, and therefore, purposes that drilling efficiency is improved and well drilling cost is lowered are finally achieved.

Description

technical field [0001] The invention relates to the technical field of oil and gas drilling, in particular to a method for optimizing drilling parameters based on plastic energy consumption ratio. Background technique [0002] Low drilling efficiency is one of the main factors causing high oil and gas drilling costs. How to improve drilling efficiency and reduce drilling costs is a long-term difficult problem in the process of oil and gas drilling. At present, mechanical rock breaking is still the main operation method of oil and gas drilling. PDC bit is the most important tool for mechanical rock breaking. The cutting and rock breaking efficiency of its drill teeth directly determines the drilling efficiency and drilling cost. How to find the best rock-breaking efficiency of the drill teeth, guide the optimization of the drill bit design and optimize the drilling parameters, plays a vital role in improving the drilling efficiency and reducing the drilling cost. [0003] Ac...

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Problems solved by technology

[0004] In the prior art, mechanical specific energy (MSE) is a commonly used index at this stage to evaluate the rock-breaking efficiency. Its concept is the energy consumed by breaking a unit volume of rock. The critical cutting depth can be obtained by using the mechanical specific energy, but it cannot Determining the optimum depth of cut and therefore not obtaining the optimum drilling parameters to further improve drilling efficiency

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