L-shaped drilling and punching method

Abstract

The L-shaped drilling and punching method comprises the following steps that firstly, a drilling tool is tripped into a drill hole, a drill bit at the end of the drilling tool is tripped into the bottom of the drill hole, clear water is introduced into the hole bottom of the drill hole, rock powder in the drill hole is flushed through the clear water, and after the clear water flushes the horizontal section of the drill hole, the rock powder is carried and discharged from an orifice of the vertical section; then mud is pressed into the drill hole, and rock powder in the hole is replaced with the mud; clear water is pressed into the drill hole, and the mud in the hole is washed out through the clear water; alums water is pressed into the drill holes, and residual mud in the drill holes is precipitated; washing with clean water again, pulling out the drill hole, and synchronously pressing alum water into the drill hole, so that residual particulate matters in the drill hole are precipitated, and impurities in the drill hole are precipitated. According to the L-shaped drilling hole flushing device, multiple flushing modes are matched, rock powder or grouting slurry particles in an L-shaped drilling hole can be flushed thoroughly, water in the hole is clear, and the imaging effect of an observation instrument is improved.

Description

Technical Field

[0001] The invention relates to the technical field of drilling and flushing, in particular to an L-shaped drilling and punching method. Background Art

[0002] During downward drilling or grouting construction, after the construction is completed, it is often necessary to observe the drilling effect or grouting effect through an in-hole television or a borehole peephole, but at this time there are a lot of rock powder or grouting slurry particles in the hole. Especially for L-shaped boreholes, a large amount of rock powder or grouting slurry particles will be deposited in the horizontal section of the L-shaped borehole, seriously affecting the imaging effect. Therefore, the borehole needs to be flushed before lowering the observation instrument. For L-shaped holes, the existence of its vertical section seriously affects the flushing of rock powder or grouting slurry particles in the horizontal section, resulting in incomplete flushing and reduced imaging effect. Summary of the invention

[0003] To this end, the technical problem to be solved by the present invention is to provide an L-shaped drilling and punching method capable of thoroughly flushing rock powder or grouting slurry particles in the L-shaped drill hole.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: an L-shaped drilling and punching method, comprising the following steps:

[0005] Step A: lower the drill tool into the borehole, and lower the drill bit at the end of the drill tool to the bottom of the borehole, then pass clean water to the bottom of the borehole through the drill bit of the drill tool, use the clean water to flush the rock powder in the borehole, and after the clean water flushes the horizontal section of the borehole, it carries the rock powder and is discharged from the orifice of the vertical section;

[0006] Step B: Press mud into the borehole through the drilling tool to replace the rock powder in the hole with the mud;

[0007] Step C: Press clean water into the borehole through the drill bit of the drilling tool, and use the clean water to flush out the mud in the hole;

[0008] Step D: Pressurize alum water into the borehole through the drilling tool to precipitate the mud remaining in the hole;

[0009] Step E: Press clean water into the borehole again through the drilling tool to flush the mud sediment;

[0010] Step F: Install the drill bit and simultaneously press alum water into the borehole to settle the remaining particles in the borehole;

[0011] Step G: Place a borehole peephole into the borehole for observation.

[0012] In the above-mentioned L-shaped drilling and punching method, in step A, the pressure when flushing the drill hole with clean water is 0.2Mpa and the flow rate is 300L / min. After the clean water returns from the hole mouth, flushing is continued for 20 minutes and then stopped.

[0013] In the above L-shaped drilling and punching method, in step B, CMC is added to the mud for thickening, and the mud flow rate is 1m 3 / min. After thick slurry comes out of the borehole, continue to circulate the mud for 30 minutes and then stop.

[0014] In the above L-shaped drilling and punching method, in step C, the pressure when flushing the drill hole with clean water is 0.2Mpa and the flow rate is 300L / min. After the clean water returns from the hole mouth, flushing is continued for 20 minutes and then stopped.

[0015] In the above L-shaped drilling and punching method, in step D, when washing with alum water, the alum water ratio is 1 ton of water with 500g of alum; the alum water pressure is 0.2Mpa, the flow rate is 300L / min, and the alum water is pressed into 3m 3 Finish with alum water.

[0016] In the above-mentioned L-shaped drilling and punching method, in step E, the pressure when flushing the drill hole with clean water is 0.2Mpa and the flow rate is 300L / min. After clean water returns from the hole and there is no sediment, continue flushing for 20 minutes and then stop.

[0017] In the above L-shaped drilling and punching method, in step F, when washing with alum water, the alum water ratio is 1 ton of water with 500g of alum; the alum water pressure is 0.2Mpa, the flow rate is 300L / min, and the alum water is pressed into 3m 3 Finish with alum water.

[0018] In the above L-shaped drilling and punching method, in step G, after the drilling is completed, wait for more than 4 hours and then put a drilling peephole into the borehole for observation.

[0019] In the above L-shaped drilling and punching method, in steps A to C, the drill bit of the drilling tool is located at the bottom of the hole.

[0020] In the above-mentioned L-shaped drilling and punching method, in step D, the drill tool is lifted, the drill bit position is lifted back 100m, and alum water is injected simultaneously; in step F, the drill tool is lifted, the drill bit position is further lifted back 150m, and alum water is injected simultaneously, and alum water is injected into the hole while the drill is lifted, so that the alum water can be evenly mixed in the borehole, and the relative flow of the alum water is small, which can reduce the disturbance of impurities in the borehole and improve the clarity of the field of view in the hole.

[0021] The technical solution of the present invention achieves the following beneficial technical effects:

[0022] Since the borehole is mixed with impurities such as mud and rock powder, and the physical parameters vary greatly, a single flushing method cannot guarantee the flushing effect. The present invention adopts a variety of flushing methods to flush out the rock powder or grouting slurry particles in the L-shaped borehole, making the water in the hole clear and improving the imaging effect of the observation instrument. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the drill bit of the drilling tool of the present invention being located at the bottom of a hole;

[0024] The reference numerals in the figure are as follows: 1-horizontal section; 2-vertical section; 3-drilling tool. DETAILED DESCRIPTION

[0025] An L-shaped drilling and punching method in this embodiment includes the following steps:

[0026] Step A: lower the drill tool 3 into the borehole, and lower the drill bit at the end of the drill tool 3 to the bottom of the borehole, then pass clean water to the bottom of the borehole through the drill bit of the drill tool 3, and use the clean water to flush the rock powder in the borehole. After the clean water flushes the horizontal section 1 of the borehole, the rock powder is discharged from the orifice of the vertical section 2; the pressure of the clean water during flushing the borehole is 0.2Mpa and the flow rate is 300L / min. After the clean water returns from the orifice of the borehole, continue flushing for 20 minutes and then stop; flushing at this stage can quickly flush out impurities with lighter specific gravity and smaller particles in the hole, but it cannot completely flush out all the rock powder particles;

[0027] Step B: Use drilling tool 3 to press mud into the borehole, and use mud to replace rock powder in the hole; add CMC [carboxymethyl cellulose] to the mud for thickening, and the mud flow rate is 1m 3 / min, after thick slurry comes out of the borehole, continue to circulate the mud for 30 minutes before stopping; the mud has a certain viscosity, and the high-density rock powder particles are replaced by mud with low particle density to achieve complete replacement of the rock powder in the hole;

[0028] Step C: Press clean water into the borehole through the drill bit of the drilling tool 3, and use the clean water to flush out the mud in the hole; the pressure of the clean water flushing the borehole is 0.2Mpa and the flow rate is 300L / min. After the clean water returns from the borehole mouth, continue flushing for 20 minutes and then stop; flush again with clean water to flush out the mud in the hole;

[0029] Step D: lift the drill 3 to raise the drill bit position back 100m, and simultaneously press alum water into the borehole through the drill 3 to precipitate the residual mud in the hole; during this alum water flushing, the alum water ratio is 1 ton of water with 500g of alum; the alum water pressure is 0.2Mpa, the flow rate is 300L / min, and it is pressed into 3m 3 The alum water is used to settle the mud remaining in the hole;

[0030] Step E: Press clean water into the borehole again through the drilling tool 3 to flush the mud sediment; the pressure of clean water flushing the borehole is 0.2Mpa and the flow rate is 300L / min. After clean water returns from the hole and there is no sediment, continue flushing for 20 minutes and then stop;

[0031] Step F: lift the drill 3 and raise the drill bit position back 150m. When lifting the drill 3, press alum water into the borehole to precipitate the remaining particles in the borehole. When flushing with alum water, the alum water ratio is 500g alum per ton of water. The alum water pressure is 0.2Mpa, the flow rate is 300L / min, and it is pressed into 3m 3 Finish with alum water.

[0032] Step G: After drilling is completed, wait for more than 4 hours and insert a borehole peep instrument into the borehole for observation.

[0033] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the claims of this patent application.

Claims

1. An L-shaped drilling and punching method, characterized in that: The following steps are involved: Step A: lowering the drilling tool (3) into the borehole, and lowering the drill bit at the end of the drilling tool (3) to the bottom of the borehole, then passing clean water to the bottom of the borehole through the drill bit of the drilling tool (3), and using the clean water to wash away the rock powder in the borehole. After the clean water washes the horizontal section (1) of the borehole, the rock powder is discharged from the orifice of the vertical section (2); Step B: Pressing mud into the borehole through the drilling tool (3) to replace the rock powder in the hole with the mud; Step C: Pressing clean water into the borehole through the drill bit of the drilling tool (3) to flush out the mud in the hole with the clean water; Step D: Pressing alum water into the borehole through the drilling tool (3) to precipitate the mud remaining in the hole; Step E: Pressing clean water into the borehole again through the drilling tool (3) to flush the mud sediment; Step F: Install the drill bit (3) and simultaneously pressurize alum water into the borehole to precipitate the remaining particles in the borehole; Step G: Place a borehole peephole into the borehole for observation.

2. The L-shaped drilling and punching method according to claim 1, characterized in that: In step A, the pressure when flushing the borehole with clean water is 0.2Mpa and the flow rate is 300L / min. After clean water returns from the borehole mouth, continue flushing for 20 minutes and then stop.

3. The L-shaped drilling and punching method according to claim 1, characterized in that: In step B, CMC is added to the mud for thickening, and the mud flow rate is 1m 3 / min. After thick slurry comes out of the borehole, continue to circulate the mud for 30 minutes and then stop.

4. The L-shaped drilling and punching method according to claim 1, characterized in that: In step C, the pressure of clean water when flushing the borehole is 0.2Mpa and the flow rate is 300L / min. After clean water returns from the borehole mouth, continue flushing for 20 minutes and then stop.

5. The L-shaped drilling and punching method according to claim 1, characterized in that: In step D, when washing with alum water, the ratio of alum water is 1 ton of water with 500g of alum; the pressure of alum water is 0.2Mpa, the flow rate is 300L / min, and the pressure is 3m 3 Finish with alum water.

6. The L-shaped drilling and punching method according to claim 1, characterized in that: In step E, the pressure of clean water when flushing the borehole is 0.2Mpa and the flow rate is 300L / min. After clean water returns from the hole and there is no sediment, continue flushing for 20 minutes and then stop.

7. The L-shaped drilling and punching method according to claim 1, characterized in that: In step F, when washing with alum water, the ratio of alum water is 1 ton of water with 500g of alum; the pressure of alum water is 0.2Mpa, the flow rate is 300L / min, and it is pressed into 3m 3 Finish with alum water.

8. The L-shaped drilling and punching method according to claim 1, characterized in that: In step G, after the drilling is completed, wait for more than 4 hours and then put a borehole peep instrument into the borehole for observation.

9. The L-shaped drilling and punching method according to claim 1, characterized in that: In step A to step C, the drill bit of the drilling tool (3) is located at the bottom of the hole.

10. The L-shaped drilling and punching method according to claim 1, characterized in that: In step D, the drilling tool (3) is lifted to raise the drill bit position back 100 m, and alum water is injected simultaneously; in step F, the drilling tool (3) is lifted to raise the drill bit position back another 150 m, and alum water is injected simultaneously.

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