A method and system for determining the coincidence rate between actual drilling and design well

Abstract

The invention relates to a coincidence rate determining method and system of a really drilled well and a designed well belonging to the petroleum and natural gas drilling technical filed. The method comprises following steps: determining comparison items and element values thereof of the really drilled well and the designed well according to drilling engineering design and real drilling data; setting weight values according to the significances of the comparison items; calculating and evaluating item element subordinating degrees through a subordinating degree function and constructing fuzzy vectors; calculating the close degrees of the fuzzy vectors of corresponding comparison items; and calculating the total close degree of the comparison items according to the weight values of the comparison items in an item weight module. According to the method and the system of the invention, the coincidence rate of the really drilled well and the designed well is described according to the close degrees of the fuzzy vectors; the evaluation quantification is realized; the artificial subject judgment is reduced; the evaluation is more scientific; and the method and the system have very important significance in drilling post-evaluation.

Description

technical field [0001] The invention relates to a method and a system for determining the coincidence ratio between actual drilling and designed wells, and belongs to the technical field of oil and gas drilling. Background technique [0002] In the field of oil and gas drilling technology, drilling engineering design plays a very important role. It is to know the standards of on-site drilling operations and guide the operation. Drilling complications may occur. At present, the drilling engineering design is generally prepared according to the drilling geological design, combined with the actual drilling data of adjacent wells, and the drilling industry specifications. According to my country's oil and gas industry standard SY / T 5333-2012 "Drilling Engineering Design Format", the drilling engineering design mainly includes Design, wellbore trajectory design, drilling fluid design, health, safety and environmental protection (HSE) design, drilling quality requirements and dril...

AI Technical Summary

Problems solved by technology

At present, the evaluation of the coincidence rate between the actual drilling and the designed well is in a "qualitative" stage as a whole. During on-site acceptance, the results are given qualitatively based on the personal experience of the acceptance personnel, for example: "a certain well has a high coincidence rate", "a certain well The coincidence rate of one well is not bad", "the coincidence rate of a certain well is low", etc., lacking a set of scientific and reasonable evaluation methods to clearly give a "quantitative" result

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