Method for measuring the length of the borehole after the drill pipe exits the borehole
A technology of borehole length and measurement method, which is applied in the directions of measurement, earthwork drilling, wellbore/well components, etc., which can solve problems such as inability to measure borehole length, and achieve the effect of avoiding borehole collapse and accurate measurement
Active Publication Date: 2020-10-09
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology
[0004] The purpose of the present invention is to provide a method for measuring the length of the borehole after the drill rod exits the borehole, so as to solve the technical problem that the length of the borehole cannot be measured after the drill pipe exits the borehole
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[0024] Such as figure 1 As shown, after drilling 1 at the coal seam or rock formation 13 drill bits, after the drill rod withdraws from the borehole, the length of the borehole 1 is quickly and accurately measured by the method for measuring the length of the borehole after the drill rod of the present embodiment withdraws from the borehole. Accurate measurement to verify whether the length of borehole 1 meets the construction requirements.
[0025] A kind of method for measuring the length of the borehole after the drill rod exits the borehole of the present embodiment comprises the following steps:
[0026] Step 1. After the drill rod exits the borehole 1, seal the opening of the borehole 1 and leave an openable and closed gas inlet and outlet pipe 5 at the opening. Specifically, a gas inlet and outlet pipe 5 is arranged in the rubber plug 2, and an air bag 3 is sleeved on the rubber plug 2. The length of the rubber plug 2 is generally about 15 to 30 cm, and the length of t...
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The present invention proposes a method for measuring the length of a borehole after the drill pipe exits the borehole, comprising the following steps: Step 1, after the drill pipe exits the borehole, seal the opening of the borehole and leave an openable, Closed gas inlet and outlet pipe; step 2, open the gas inlet and outlet pipe, inject a certain volume V of characteristic gas from the gas inlet and outlet pipe into the borehole, and close the gas inlet and outlet pipe; step 3, after the characteristic gas is mixed evenly with the air in the borehole, Open the gas inlet and outlet pipe, extract the mixed gas in the borehole from the gas inlet and outlet pipe, and determine the concentration C of the characteristic gas in the mixed gas; step 4, calculate the length L of the borehole, L=V / (C×π×r 2 ), where π is the circumference of the circle, and r is the radius of the borehole. The beneficial effect of the present invention is that the length of the borehole can be quickly and accurately measured after the drill rod withdraws from the borehole, so as to verify whether the length of the borehole meets the construction requirements, and the borehole collapse can be avoided during the measurement process.
Description
technical field [0001] The invention relates to the technical field of borehole measurement, in particular to a method for measuring the length of a borehole after a drill rod withdraws from the borehole. Background technique [0002] Drilling operations are widely used in engineering construction, such as gas drainage drilling in coal mines, drilling and blasting during tunneling, etc. Tunneling and geotechnical construction also require extensive drilling operations. During the construction process, the length of the drilled hole can be determined by the length of the drill pipe. However, the drilling operator may misreport the length of the borehole, or the actual length of the borehole may vary due to a collapse in the borehole after the drilling operation. Changes in the actual length of the borehole will affect the construction quality of the project and even cause safety accidents. For example, during the drilling operation of coal seam gas drainage, a large number...
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IPC IPC(8): E21B47/04E21B33/03
Inventor 陆伟李金亮刘震程卫民
Owner SHANDONG UNIV OF SCI & TECH