Method for judging geological layer where drill of drilling machine where drill of drilling machine drilling for certain depth is positioned

Abstract

The invention discloses a method for judging the geological layer where the drill of a drilling machine drilling for a certain depth is positioned. The method comprises the following steps: 1), obtaining the rock formation density of a target rock formation, P wave velocity and Poisson's ratio Mu, so as to obtain the elastic modulus of the target rock formation through calculation; 2), comparing the elastic modulus of the target rock formation with data in a computer database, so as to obtain the type of the rock formation through analytical judgment; 3), recording the depth when the elastic modulus of the rock formation and the original value of the elastic modulus of the rock formation change suddenly, wherein the depth is the interface depth of the rock formation; 4), repeating the steps (1, 2 and 3), so as to obtain the geological layers where the drill of the drilling machine drilling for different depths are positioned. The method has the advantages that physical properties and mechanical parameters can be obtained through laboratory tests without depending on rock core, real-time analysis and calculation can be carried out according to corresponding data collection when the drilling machine is used for drilling, and the rock formation where the drill is can be judged, so that the process of obtaining the physical properties and mechanic parameters of rock formations of different depths can be simplified greatly, and engineering time is shortened.

Description

technical field [0001] The invention relates to a method for judging the rock strata in real time during the drilling process of a drilling rig, which is suitable for real-time judging of the rock strata where the drill bit is in when the drilling rig is drilling in underground engineering. Background technique [0002] In the past, in order to obtain the physical property parameters of the local rock formation, during the drilling process of the drilling rig, the core tool was often used to drill out the core, and the rock uniaxial compression test was performed in the laboratory, and the core compressive strength test was provided. Report. [0003] However, the method of experimental testing by core sampling has the following problems in practice: [0004] 1. The long interval from on-site coring to the experimental report in the laboratory seriously restricts the progress of the actual on-site construction and increases the cost of the project budget. At the same time, d...

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Problems solved by technology

[0004] 1. The long interval from on-site coring to the experimental report in the laboratory seriously restricts the progress of the actual on-site construction and increases the cost of the project budget. At the same time, due to the large number of cores, group numbering, analysis and processing become very heavy , lack of practicality

[0005] 2. It is difficult to guarantee the core recovery rate and integrity when drilling in weak and broken complex formations

When working in unfavorable geological bodies, it is difficult to obtain a complete core that can be used for testing, so that the physical properties and mechanical parameters of the local rock formation cannot be obtained

[0006] 3. Since the core has been evacuated from the original environmental stress, temperature and other constraints, it cannot well represent the strength of the rock mass itself

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