CN206668164U - A kind of ice sheet drilling uses Air Reverse Circulation carbide drill - Google Patents

Abstract

The utility model discloses a kind of ice sheet drilling Air Reverse Circulation carbide drill, mainly it is made up of bit body, conical pipe, carbide cutting tooth and double-walled joint, double-walled joint outer tube is threadedly coupled with bit body, its inner tube cooperatively forms conical flow passage with conical pipe, hard alloy welding-on is on the bit bottom lip surface with leaning angle, bit body central passage lower eccentric is designed, and hemisphere jut is provided between drill bit hard alloy.During drilling, the gas come in through double-wall drill pipe is into the circular passage between double-walled joint inner and outer pipes, and then a part of gas is by the ejection at a high speed of the tapered channel between conical pipe and double-walled joint inner tube, and generation strong negative-pressure is to bottom hole generation swabbing action；A part of gas cools down to carbide cutting tooth, while carries ice bits and moral purity through being returned in bit body central passage.The utility model, which can be realized, not to stop to bore continuous coring, is advantageous to improve drilling efficiency and moral purity taking rate.

Description

A kind of ice sheet drilling uses Air Reverse Circulation carbide drill

Technical field

The utility model belongs to polar drilling technical field, is related to a kind of Air Reverse Circulation carbide drill.

Background technology

Polar ice sheet accounts for the 10% of Global land area, and its natural environment has important value to the mankind.Due to polar region Ice sheet temperature is low, be far from the crowd pollution, has compared with other Climatic Proxys and contains much information and fidelity is good, time resolution The features such as rate is high, time scale scope is big, distribution area is wide, it is to study one of the most key area of Global climate change.It is logical Ice sheet core drilling technology is crossed, obtain high quality ice core has turned into the important research direction of polar science, to human social development There is important scientific meaning and social value with the cognition to nature.But by harsh weather and the shadow of earth's surface ice and snow environment Ring, polar drilling core it is complex, at present frequently with armored cable formula electric mechanical core drill carry out ice sheet core drilling. Motor machine drilling tool is delivered in hole and crept into by this method using armored cable, round trip terminate after using cable by drilling tool carry to Earth's surface obtains moral purity and ice bits, then again transfers drilling tool to bottom hole and continues to creep into, goes round and begins again.Because this method needs to carry brill To core, drilling non-cutting time length, drilling efficiency is low, and due to replacing conventional drill using armored cable, once block in hole The complex accidents such as brill, processing are extremely difficult.Therefore, core drilling construction period in polar region is longer, seriously constrains polar drilling section The development of technology.In addition, existing drilling method uses drilling fluid as circulatory mediator, in ice sheet top snow cover and snow ice layer During construction, drilling fluid is easily missed and pollutes polar region natural environment, and drilling fluid also has a certain impact to moral purity, therefore is badly in need of A kind of environmental protection, safety, quick core drilling technology.In recent years, Air Reverse Circulation continuous coring drilling technology is not because it is with Stop boring the advantages that continuous coring samples, drilling efficiency and coring and sampling rate are high, pollution-free to coring and sampling, in conventional geology rock core Drilling field has been widely used.If applying it in ice layer of polar region probing, polar drilling drilling will be greatly improved Efficiency.Different from the physical parameter of rock stratum yet with ice sheet, conventional geological core drilling is difficult to effectively bore with reverse circulation drill bit Enter ice sheet.Drill bit structure is one of critical component of air reverse circulation drilling, its performance directly decide reverse circulation drilling into Lose, if reacting cycle formation is not thorough, ice bits will be caused to be sprayed from the annular space of drilling tool and ice wall, not only reduce moral purity ice sample Taking rate, and drilling efficiency is influenceed, or even complex accident in the holes such as bit freezing can occur.How to design being capable of fast drilling ice The Air Reverse Circulation core bit of layer, it has also become implement air reverse circulation drilling urgent problem in polar ice sheet.

The content of the invention

The purpose of this utility model is to provide a kind of can have the strong suction to make by fast drilling in ice sheet to bottom hole Air Reverse Circulation continuous coring samples carbide drill.

The utility model is made up of bit body, carbide cutting tooth, conical pipe and double-walled joint, bit body bottom labial surface Seting welding carbide cutting tooth, bit body top are connected by screw thread with the outer tube of double-walled joint, and bit bottom lip surface leads to center Road direction has leaning angle；Conical pipe is connected by screw thread with bit body, and taper is cooperatively formed with the inner tube wall of double-walled joint Gas channel, supported between the inner tube and outer tube of conical pipe double-walled joint by support block, between the inner tube and outer tube of double-walled joint Formed with annular space；If having dry bottom spray orifice on bit body, bit body has central passage eccentric orfice, carbide cutting tooth Welding-on is around the spray orifice of bottom, and rake penetration rate is -15 °~15 °, and interior outgoing sword is not less than 2mm.The bottom face of bit body is provided with some Hemisphere jut.

Described leaning angle is 5 °~10 °.

Working process and principle of the present utility model：

The gas come in from hole internally-powered drilling tool or double-wall drill pipe enters the annular space of the double-walled joint of drill bit, Ran Houyi The conical flow passage that portion gas is formed through conical pipe and double-walled joint inner tube wall sprays at a high speed, gradual undergauge, finally exists Converged in bit body, form strong negative-pressure, stronger swabbing action is produced to bottom hole.Bit bottom lip surface has certain leaning angle, Guide functions are produced to gas, a part of gas is acted on carbide cutting tool after the bottom spray orifice on bit body sprays, Take away drilling caused by partial heat, it is cooled down, at the same carry ice bits and central passage of the moral purity through bit body it is inclined The heart returns on hole, forms strong reacting cycle.The hemisphere jut designed on bit bottom lip surface can limit carbide cutting tooth and cut Enter the depth of ice sheet, so as to control mode and ice bits size.In drilling process, when moral purity reaches certain length, at the top of moral purity Contacted with the central passage eccentric orfice inwall of bit body and moral purity fracture, then moral purity in the presence of high velocity air along drill bit Earth's surface is returned to in the drilling tool central passage of top, brill continuous coring is not carried in drilling process so as to realize.

The beneficial effects of the utility model：

Conical flow passage is designed with carbide drill, gas sprays at a high speed through conical flow passage, gradually contracting Footpath, finally converged in bit body, form strong negative-pressure, powerful swabbing action is produced to bottom hole, beneficial to removing ice bits and shape Into effective reacting cycle, it can realize and not stop to bore continuous coring sampling, be advantageous to improve drilling efficiency and moral purity ice sample taking rate, So as to significantly shorten the polar drilling engineering construction cycle, the risk for producing complex accident in hole is reduced, to improving polar drilling skill Art level is significant.

Brief description of the drawings

Fig. 1 is diagrammatic cross-section of the present utility model.

Fig. 2 is enlarged diagram at E in Fig. 1.

Fig. 3 is tapered tube configuration schematic diagram of the present utility model.

Fig. 4 is bit bottom lip surface structural representation of the present utility model.

1- bit bodys；2- carbide cutting teeth；3- conical pipes；4- double-walled joints；5- tapered channels；6- hemisphere juts； 101- bottoms spray orifice；102- central passage eccentric orfices；401- outer tubes；402- is supported；403- inner tubes；404- annular spaces.

Embodiment

Refer to shown in Fig. 1, Fig. 2, Fig. 3 and Fig. 4, the utility model is by bit body 1, carbide cutting tooth 2, taper Pipe 3 and double-walled joint 4 form, and the bottom labial surface seting welding carbide cutting tooth 2 of bit body 1, the top of bit body 1 passes through screw thread and double-walled The outer tube 401 of joint 4 connects, and bit bottom lip surface has leaning angle α to central passage direction.Conical pipe 3 passes through screw thread and drill bit Body 1 connects, and the inwall of inner tube 403 of conical pipe 3 and double-walled joint 4 cooperatively forms conical flow passage 5, the inner tube of double-walled joint 4 Supported between 403 and outer tube 401 by support block 402, formed with annular space between the inner tube 403 and outer tube 401 of double-walled joint 4 404；If having dry bottom spray orifice 101 on bit body 1, bit body 1 has central passage eccentric orfice 102, and carbide cutting tooth 2 is inlayed It is welded in around bottom spray orifice 101, rake penetration rate is -15 °~15 °, and interior outgoing sword is not less than 2mm.If the bottom face of bit body 1 is provided with Dry hemisphere jut 6.

Described leaning angle α is 5 °~10 °.

Working process and principle of the present utility model：

The gas come in from hole internally-powered drilling tool or double-wall drill pipe enters the annular space 404 of the double-walled joint of drill bit, so The conical flow passage 5 that rear portion gas is formed through conical pipe 3 with the inwall of 4 inner tube of double-walled joint 403 sprays at a high speed, gradually contracting Footpath, finally converged in bit body 1, form strong negative-pressure, stronger swabbing action is produced to bottom hole.Bit bottom lip surface has one Determine leaning angle α, guide functions are produced to gas, a part of gas acts on hard after the bottom spray orifice 101 on bit body 1 sprays On alloy cutting element, partial heat caused by creeping into is taken away, it is cooled down, while carry ice bits and moral purity through bit body Returned on 1 central passage eccentric orfice 102, form strong reacting cycle.The hemisphere jut 6 designed on bit bottom lip surface can limit Carbide cutting tooth 2 cuts the depth of ice sheet, so as to control mode and ice bits size.In drilling process, when moral purity reaches one During measured length, contacted with the inwall of central passage eccentric orfice 102 of bit body 1 at the top of moral purity and moral purity fractures, then moral purity exists Earth's surface is returned to along drill bit and top drilling tool central passage in the presence of high velocity air, so as to realize that not carrying brill in drilling process connects It is continuous to core.

Claims (3)

1. a kind of ice sheet drilling uses Air Reverse Circulation carbide drill, it is characterised in that：It is by bit body (1), hard alloy Cutting tooth (2), conical pipe (3) and double-walled joint (4) composition, bit body (1) bottom labial surface seting welding carbide cutting tooth (2), are bored Head body (1) top is connected by screw thread with the outer tube (401) of double-walled joint (4), and bit bottom lip surface has to central passage direction Leaning angle (α)；Conical pipe (3) is connected by screw thread with bit body (1), the inner tube (403) of conical pipe (3) and double-walled joint (4) Inwall cooperatively forms conical flow passage (5), by support block between the inner tube (403) and outer tube (401) of double-walled joint (4) (402) support, formed with annular space (404) between the inner tube (403) and outer tube (401) of double-walled joint (4)；Bit body (1) If upper have dry bottom spray orifice (101), bit body (1) has central passage eccentric orfice (102), carbide cutting tooth (2) welding-on Around bottom spray orifice (101), the bottom face of bit body (1) is provided with some hemisphere juts (6).

2. a kind of ice sheet drilling according to claim 1 uses Air Reverse Circulation carbide drill, it is characterised in that：It is described The rake penetration rate of carbide cutting tooth (2) is -15 °~15 °, and interior outgoing sword is not less than 2mm.

3. a kind of ice sheet drilling according to claim 1 uses Air Reverse Circulation carbide drill, it is characterised in that：It is described Leaning angle (α) be 5 °~10 °.