Method for detecting limestone formation pore pressure

Abstract

The invention discloses a method for detecting limestone formation pore pressure, which is applied in the technical field of oil field drilling, and comprises the following steps of sampling rock mechanics parameter data of sampled well rocks with a same geologic structure, establishing an effective stress model, requesting feature data of overlying rock pressure and depth, establishing an overlying rock pressure model, establishing a detection model of the limestone formation pore pressure and detecting the limestone formation pore pressure. The method has the benefits of having a higher fitting degree and better trend compliance, and basically solving the difficulty that a traditional method is not applicable to the detection on the limestone formation pore pressure compared with formation pore pressure data actually measured in field.

Description

technical field [0001] The invention relates to the technical field of oilfield drilling, in particular to a method for detecting downhole formation pressure. Background technique [0002] In the drilling process of limestone formation, if the collapse pressure, fracture pressure and formation pore pressure of limestone formation cannot be accurately detected, complex accidents such as lost circulation and well collapse will occur during drilling. [0003] The sedimentary compaction mechanism of limestone formations is different from the compaction theory of sandstone formations; currently, the pore pressure detection models of formations basically use sandstone formation pore pressure detection models, and sandstone formation pressure detection models are established based on compaction theory , the use of the sand-mudstone formation pressure detection model cannot reasonably explain the pore pressure of the limestone formation, resulting in large errors between the calcula...

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Problems solved by technology

[0009] The purpose of the present invention is to provide a method for detecting the pore pressure of limestone formations, aim at a series of problems encountered in the detection of limestone formation pore pressures, and solve the problem that the pore pressure interpretation model of sand and mudstone formations is difficult to detect the pore pressures of limestone formations. problem, establish an interpretation model for the pore pressure of the limestone formation; the present invention adopts the effective stress theorem to establish a pore pressure detection model for the limestone formation, and solves the problem that the traditional interpretation model for detecting the pore pressure of the sandstone formation is not suitable for detecting the pore pressure of the limestone formation

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