CN103939011A - Method for drilling hard granite - Google Patents
Method for drilling hard granite Download PDFInfo
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- CN103939011A CN103939011A CN201410121563.6A CN201410121563A CN103939011A CN 103939011 A CN103939011 A CN 103939011A CN 201410121563 A CN201410121563 A CN 201410121563A CN 103939011 A CN103939011 A CN 103939011A
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- China
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- drilling
- hole
- sand
- hard granite
- sand grains
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Abstract
The invention belongs to the mining geological drilling technology and particularly discloses a method for drilling hard granite. The method comprises the steps of stopping drilling when a drill bit runs into the hard granite during drilling operation, lifting a drilling tool off the bottom of a hole for 0.8cm-1.2cm, throwing sand into the hole, conveying the sand into the bottom of the hole through a water pump, throwing an inner tube assembly into the hole, and restarting a drilling rig. The sand is thrown into the hole through a drill stem in a blank pipe state, the particle size of the sand is controlled within the range from 3mm to 6mm, and Moh's hardness of the sand is 7.0-9.0. The method is easy to operate, low in cost and capable of increasing drilling efficiency, shortening an exploration period and greatly increasing work efficiency of drilling when the drill bit runs into the hard granite during drilling. The ordinary diamond drill bit can drill for more than 50m when running into the hard granite by means of the method while ordinary diamond drill bit can only drill for 5m-20m by means of the existing method.
Description
Technical field
The invention belongs to a kind of mining geology drilling technology, particularly a kind of method of creeping in hard granite.
Background technology
In the operation of creeping in hard granite, because the tyre body hardness of diamond bit is close with the hardness of granite, can cause the diamond of welding-on in bit matrix can not certainly grind tough rock cutting, so can produce, skid can not drilling depth.Diamond-impregnated bit is only applicable to 6～9 grades of rocks, 10 grades of above hard granite easily skid and can not effectively creep into, although soft matrix drill bits can creep into competent bed, but use cost is high, a common diamond bit creeps into 5～20 meters, its working lining carcass is with regard to approach exhaustion, and adopt full rock core just must upper bassoon, easily cause hole wall collapse, boring accidents.Run into local loose stratum, descend pipe all will carry out at the bottom of long cleaning bottom of hole just can get into hole, having increased labour intensity at every turn, reduced work efficiency; Use the large drill bit of tyre body hardness, because carcass is harder, run into solid rock tough with regard to can certainly not grinding, after the diamond of bit face polishes, just can not creep into, easily cause skidding, seriously restricted the superiority of wire line coring technique.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of method of creeping in hard granite, it is easy and simple to handle, with low cost, can greatly improve the work efficiency of creeping into while running into hard granite in probing.
The technical solution adopted in the present invention is: while running into hard granite in drilling operation, stop creeping into, at the bottom of drilling tool is lifted to hole, Xiang Kongzhong throws in sand grains, at the bottom of sand grains being transported to hole with water pump, drops into inner tube assembly, again starts rig and creeps into.
The height that drilling tool is lifted from the bottom of hole is 0.8～1.2cm, and sand grains adopts waste and old emery wheel broken kernel, under empty pipe condition, in drilling rod, throws in, and the granularity of sand grains is controlled at 3～6mm, and sand grains Mohs' hardness is 7.0～9.0.
The present invention further concrete operations is: the pump pressure that sand grains is transported at the bottom of hole is 1.8～4.8MPa, first start rig with the rotating speed of 280～320 revs/min by tough 5～10 minutes of diamond bit preliminary grinding, and then drop into inner tube assembly and normally creep into.
Compared with prior art, the invention has the beneficial effects as follows: 1. improved drilling efficiency, can shorten exploration cycle; 2. reduce boring accidents, prevent that drill hole wall from caving in, there is good retaining wall effect; 3. reduce the time of managing up and down and reduce labor intensity; 4. cost significantly reduces, and used old drill bit is as long as carcass is complete just can reuse, and drills drilling depth and by original 5～20 meters, bring up to present more than 50 meters when a common diamond bit runs into hard granite.
Accompanying drawing explanation
Fig. 1 is principle process chart of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
In drilling operation, when running into the common diamond bit of hard granitic formation and be difficult to creep into, select the diamond-impregnated bit of tyre body hardness 35～40.Drilling tool is lifted to 0.8～1.2cm at the bottom of hole; by sand grains or waste and old emery wheel broken kernel, (granularity is controlled at 3～6mm; Mohs' hardness is 7.0～9.0) under empty pipe condition, in drilling rod, cast; at the bottom of broken kernel being transported to hole by pump pressure (1.8～4.8MPa); start rig, rotating speed per minute 300 left and right, rotate 5 to 10 minutes; by diamond drill bit matrix just grind tough after, drop into inner tube assembly and just can normally creep into.
Claims (3)
1. a method of creeping in hard granite, is characterized in that: while running into hard granite in drilling operation, stop creeping into, at the bottom of drilling tool is lifted to hole, Xiang Kongzhong throws in sand grains, at the bottom of sand grains being transported to hole with water pump, drop into inner tube assembly, again start rig and creep into.
2. method of creeping in hard granite according to claim 1, it is characterized in that: the height that drilling tool is lifted from the bottom of hole is 0.8～1.2cm, sand grains adopts waste and old emery wheel broken kernel, under empty pipe condition, in drilling rod, throw in, the granularity of sand grains is controlled at 3～6mm, and sand grains Mohs' hardness is 7.0～9.0.
3. method of creeping in hard granite according to claim 2, it is characterized in that: the pump pressure that sand grains is transported at the bottom of hole is 1.8～4.8MPa, first start rig with the rotating speed of 280～320 revs/min by tough 5～10 minutes of diamond bit preliminary grinding, and then drop into inner tube assembly and normally creep into.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410121563.6A CN103939011A (en) | 2014-03-28 | 2014-03-28 | Method for drilling hard granite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410121563.6A CN103939011A (en) | 2014-03-28 | 2014-03-28 | Method for drilling hard granite |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103939011A true CN103939011A (en) | 2014-07-23 |
Family
ID=51186857
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410121563.6A Pending CN103939011A (en) | 2014-03-28 | 2014-03-28 | Method for drilling hard granite |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103939011A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105735894A (en) * | 2016-03-11 | 2016-07-06 | 柳超 | Mechanism used for shallow well drilling |
| CN109176159A (en) * | 2018-09-20 | 2019-01-11 | 陕西太白黄金矿业有限责任公司 | A kind of gold deposit prospecting drilling machine polishing drill bit method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85108125A (en) * | 1985-11-05 | 1987-05-06 | 武汉地质学院 | Hard and compact " skid " stratum cold galvanising diamond Special drilling bit and cold galvanising composite sheet oil bit |
| CN201963235U (en) * | 2011-03-14 | 2011-09-07 | 唐山市金石超硬材料有限公司 | Diamond core bit |
| CN102828696A (en) * | 2012-09-11 | 2012-12-19 | 吉林大学 | Iron-based diamond-impregnated bit for drilling in hard slipping foundation |
-
2014
- 2014-03-28 CN CN201410121563.6A patent/CN103939011A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85108125A (en) * | 1985-11-05 | 1987-05-06 | 武汉地质学院 | Hard and compact " skid " stratum cold galvanising diamond Special drilling bit and cold galvanising composite sheet oil bit |
| CN201963235U (en) * | 2011-03-14 | 2011-09-07 | 唐山市金石超硬材料有限公司 | Diamond core bit |
| CN102828696A (en) * | 2012-09-11 | 2012-12-19 | 吉林大学 | Iron-based diamond-impregnated bit for drilling in hard slipping foundation |
Non-Patent Citations (1)
| Title |
|---|
| 石立明等: "孔底磨钻头技术在坚硬地层钻进中的应用", 《西部探矿工程》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105735894A (en) * | 2016-03-11 | 2016-07-06 | 柳超 | Mechanism used for shallow well drilling |
| CN109176159A (en) * | 2018-09-20 | 2019-01-11 | 陕西太白黄金矿业有限责任公司 | A kind of gold deposit prospecting drilling machine polishing drill bit method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140723 |