Deep Hole Directional Drilling Machine for Coal Mine Zdy12000ld

=== Base Info ===

=== Description ===

Basic Info.

Model NO. ZDY12000LD Drill Hole Depth >300m Bit Type Drag Bit Drilling Way Compound Rated Torque 12000~3500 N·m Rotary Speed 50~170 R/Min Braking Torque 2000 N·m DIP of The Main Axis -10~20° Horizontal Drill Height 1.3 M Max Feed/Pull Force 250/250 Kn Feed/Pull Stroke 1200 mm Power 132 Kw Max Travelling Speed 2.2 Km/H Max Gradeability 15 ° Weight 9000 Transport Package Wooden Box Specification 4.20*1.60*1.90 Trademark MK Origin Xi′an

Product Description

[Introduction]
As a new technology in engineering field, underground directional drilling technology of coal mine has been widely used in borehole drilling in gas drainage, water hazard control, geological exploration and accurate drilling fields. ZDY12000LD directional drilling rig, mud pulse transmission MWD system, assorted drilling tools and combined directional drilling technique are developed to solve current technical limitation of direction drilling. The whole set of equipment appears significant advantages. These advantages include enlarged power, high borehole accident handing capacity and high wireless MWD accuracy. Meanwhile, less drilling cutting and small borehole curvature are expected to generate by combined directional drilling technique. The ZDY12000LD drilling rig have completed the ultra-long directional drilling along the coal seam with the main hole depth of 3353m in Baode coal mine, which has once again set a new world record of directional drilling in China.


[Components of directional drilling system]
1.Drilling rig
ZDY12000LD is a directional drilling rig with high rotary torque (the rated torque is 12000N.m), low rotary speed (range from 50r/m to 150r/m). The rig is capable for precise directional drilling operations with borehole depths of up to 1500m by using a downhole motor. It is suitable to drill large diameter underground borehole. The application of the rig includes directional drilling operations for gas drainage, water detection/drainage, grout injection, exploration of geological structure, detection of seam thickness, water injection in seam, etc. Technical parameters are listed in following table.



Some special features/benefits on the rig are:
(1) Magnificent power and drill ability
As far as we know, ZDY12000LD drill rig has the highest rated torque in underground series drill rigs. Magnificent torque not only lead to the strong borehole drilling ability but also can maintain outstanding ability to avoid downhole accident. It can meet the requirement of rotary drilling technique, downhole motor drilling technique and integrated drilling technique (mix rotary drilling with downhole drilling) with relative high drilling efficiency.
(2) Advanced hydraulic system
With the use of high quality hydraulic components(Rexroth and Sauer), the rig has a reliable hydraulic. Chuck and clamp can be operated independently which lead to flexible and reliable control. Drill rod deployed handle are special designed to protect drill rod screws during connect and discharge process. Linkage system and optimized pressure/flow rate control lead to simple operation.

2. Mud pump crawler
BLY390/12 mud pump crawler is a hydraulic pump crawler with large flow rate (the max flow rate is 390l/min) and high mud pressure (rated pressure is 12Mpa). The rig can maintain enough flow rate under high pressure work situation. It can supply enough hydraulic fluid power for downhole motor operation and drill cut remove to meet the requirement of long depth directional borehole drilling.





3. Downhole assembly
Typical downhole assembly include several drill tools packages:
(1) Φ98mm directional drill bit, Φ73mm downhole motor, cable transmission MWD system and Φ73mm cable-transmission drill rod. The assembly is suitable for long distance directional borehole drilling in coal seam.
(2) Φ98mm directional drill bit, Φ73mm downhole motor, mud pulse transmission MWD system and Φ73mm cable-free drill rod. The assembly is suitable for long distance directional borehole drilling in coal seam.
(3) Φ120mm directional drill bit, Φ89mm downhole motor, cable transmission MWD system and Φ89mm cable-transmission drill rod. The assembly is suitable to drill pilot hole for long distance directional borehole drilling in roof and coal seam.
(4) Φ98mm-Φ120mm reamer drill bit, and Φ73mm cable-transmission drill rod/Φ73mm cable-free drill rod. These tools are used to expand borehole for large diameter directional borehole drilling in coal seam.
(5) Φ120mm-Φ153mm reamer drill bit, Φ89mm cable-transmission drill rod/Φ89mm cable-free drill rod. These tools are used to expand borehole for large diameter directional borehole drilling in roof.
(6) Φ133mm-Φ98mm-Φ82mm fishing drill bit, Φ102mm fishing string. These tools are used to fish Φ73mm downhole assembly.
(7) Φ146mm-Φ120mm-Φ100mm fishing drill bit, Φ127mm fishing string. These tools are used to fish Φ73mm downhole assembly.


[Technical specification]

Type	ZDY12000LD
Rated torque/N • m	12000~3500
Rated speed/(r/min)	50~170
Brake torque/N • m	2000
Borehole depth/m	1500
Rod diameter/mm	73/89/102/127
Dip of the main axis/°	-10~20
Horizontal drill height/m	1.3
Max feed/pull force/kN	250/250
Feed/pull stroke/mm	1200
Power/kW	132
Max travelling speed/(km/h)	2.2
Max gradeability/°	15
Weight/kg	9000
Dimension(L×W×H)/m	4.20×1.60×1.90

[Patent certificate]


[Highlights and advantages]
1.Compact structure and suitable for a variety of drilling technology
The compact structure design of the rig makes it possible to effectively solve the problems of small output of the rig and inconvenient relocation. The design of large hole power head with double power input and planetary wheel deceleration realizes the adaptability of large output capacity and multi-process. The large opening compound gripper on the drilling rig can meet the needs of screwing and unloading drilling tools with large clamping force. The rig's rubber cylinder hydraulic chucks support annular clearance self-compensation and efficient dynamic oil distribution. In addition, the drilling rig also has a friction braking device that meets the needs of directional drilling to hold the main shaft tightly, and a multi-support dual-cylinder direct-push attitude adjustment device that realizes convenient adjustment of opening parameters.

2.Drilling rig hydraulic system with multiple logic protection functions
The drilling machine adopts three pumps hydraulic control system with independent adjustment of drilling parameters, which realizes multiple safety protection, precise control and reliable switching of various drilling processes. Its two-speed drilling mode can be easily switched and adapted to the needs of a variety of drilling processes. The sensitive and convenient load sensing, constant pressure variable, hydraulic pilot and other control systems ensure the stability of directional drilling. A variety of protection circuits such as directional drilling protection and anti-drilling protection can effectively cope with unexpected conditions during construction.

3.High-pressure and large-flow liquid drive mud pump truck with adaptive output parameters
The mud pump truck equipped with this drilling rig adopts a load sensing system and a pump control system with a proportional pilot control method. This not only realizes the high-pressure and large-flow output of the mud pump, but also improves the adaptation of parameters and the drilling load, as well as the precise stepless control of the remote. At the same time, each work unit is integrated on the crawler platform, which solves the problem that the pump truck cannot be moved independently and conveniently.

The drilling rig has obtained 6 patents, which effectively solves the problems of inadequate directional drilling technology and equipment capacity, low drilling efficiency, and poor process adaptability in coal mines. Since its promotion and application, a total of 101 sets of high-power directional drilling equipment have been sold, with 2.37×106 m of coal seam drilling, 1.00×106 million m of rock drilling, and 7.01×108 m3 of gas drainage. A total of 2.766 billion yuan in new output value and 590 million yuan in new profits were created. The record of directional drilling depth in underground coal mines was refreshed four times, with the maximum hole depth reaching 3353m, and the diameter of one-time directional drilling was increased from φ96mm to φ120mm. At the same time, it created a record of 1227m depth of directional drilling in the underground rock strata of domestic coal mines, with a maximum drilling diameter of 220mm. The drilling rig provides equipment support for engineering applications such as high-location drilling in complex roof rock formations instead of high-drainage tunnels, which reduces the comprehensive cost of complex roof gas management in underground coal mines by 2/3 and increases efficiency by 1/3. This has greatly promoted the safety and efficient production of coal mines.


[Compared with similar technologies at home and abroad ]

	Similar technologies at home and abroad	Directional drilling equipment in underground coal mine	Compared
Directional drilling equipment	The power of the directional drilling rig is not more than 90kW, and the rated torque is less than 6000Nm; The pump pressure of the mud pump is lower than 9MPa, and the flow rate is lower than 320L/min;The torsional strength of the drill pipe measured while drilling is lower than 19000Nm, and the impact energy of the non-magnetic drill pipe is about 50J.	The power of drilling equipment is greater than 240kW, and the maximum torque reaches 23000Nm;The maximum output pressure of the mud pump truck is 13MPa, and the maximum output flow is 800L/min;The torsional strength of the drill pipe measured while drilling reached 34000 Nm, and the impact energy of the non-magnetic drill pipe reached 220J.	Xi'an Research Institute International Leading
Measurement while drilling technology and instruments	Wired method is adopted to transmit the measurement while drilling data, which relies on the special cable drill pipe;As the length of the borehole increases, the stability of signal transmission decreases;It cannot meet the needs of high-efficiency composite directional drilling for near-horizontal holes.	Based on limited transmission measurement while drilling, a wireless transmission measurement while drilling system has been developed, which can be used with various types of drill pipes.;The transmission depth exceeds 2000m, long-distance signal transmission is stable, and the failure rate is low;It can Meet the needs of highly efficient composite directional drilling for near-horizontal holes.	Xi'an Research Institute International Leading
Supporting process system	Using sliding directional drilling technology for drilling construction, the drilling efficiency is low, and the smoothness of the trajectory is poor. The diameter of the final hole is 96mm, and it is difficult to form holes in the complex and broken coal rock.	Using the composite directional drilling technology system for drilling construction, the comprehensive drilling efficiency is increased by more than 40%, and the smoothness of the trajectory is increased by more than 60%. The maximum diameter of the final hole is 220mm. It can be used to form holes in complex broken coal and rock formations.	Xi'an Research Institute International Leading
Overall technology and application effects	It is suitable for directional drilling in medium-hard and stable coal seams within 1000m. The maximum drilling depth in the coal seam is 1212m, the maximum depth of the large-diameter drilling hole in the roof rock layer is 500m, and the maximum drilling depth of the floor rock layer water damage prevention and control drilling hole is 610m. It is mainly used for pre-mining gas pre-drainage and water hazard prevention.	It can meet the requirements of directional drilling above 3000m. The depth of coal seam gas drainage drilling has been increased to 3353m, the depth of large-diameter drilling in the roof rock layer has been increased to 1026m, and the drilling depth of water damage prevention and control drilling in the floor rock layer has been increased to 1227m. It has realized regional pre-mining gas pre-drainage, high-efficiency mining pressure relief gas drainage and advanced water hazard prevention and control. It is also promoted to be used in mine fire prevention, dust control, accident rescue and other fields.	Xi'an Research Institute International Leading

[Application]
Four world records have been set one after another with the deepest borehole of 3353m

1.Baode coal mine, Shenhua Group, China
Xi'an Research Institute started drilling construction from No.27 roadway of No.1 intake airflow roadway in No.5 panel of Baode coal mine, taking 21 days to drill through the working face of the second panel and successfully connected with the No.2 return air roadway of the third lower panel on the opposite side. The depth of the main hole is 3353m, the total footage is 4428m, the hole diameter is 120mm, the top and bottom branches are explored 13 times, the error of the target coordinate of the drilling through the roadway is less than 0.15%, and the average daily gas drainage volume is more than 5000m³ at present.

This drilling broke the world record for the hole depth of the 2570m ultra-long directional borehole created by CCTEG Xi'an in Baode Mine in early 2019. The drilling project successfully achieved a significant increase in drilling depth and achieved ultra-long-distance high-precision mid-targets, mainly due to CCTEG Xi'an's continuous innovation in downhole directional drilling technology and equipment development. The institute has developed a super-long directional hole sliding drilling drag reduction process and a composite drilling trajectory control method for underground coal mines, which greatly improved the downhole drilling capability and drilling efficiency. The ZDY15000LD directional drilling equipment, the YHD3-3000 mud pulse wireless measurement while drilling system and the large through-hole high-strength cableless directional drilling tool, which are independently developed by CCTEG Xi'an, are applied to realize the measurement of the pressure pulse signal in the wireless while drilling. Deep and stable transmission. In addition, CCTEG Xi'an has also applied industrially to the newly developed underground cleaning fluid circulation system for underground coal mines, solving the problem of large water consumption and large discharge volume of ultra-long hole construction. This realizes the leap of directional drilling flushing fluid from "open" to "closed" circulation, which promotes the development of green drilling technology and equipment in coal mines.

The successful implementation of 3353m ultra-long directional drilling along the coal seam is a new milestone in the development of underground directional drilling technology and equipment, marking that China has reached the international leading level in the field of underground directional drilling, which is of great significance to promote the advance control of gas in large areas of coal seam, the replacement of tunnel engineering with holes, the prevention and control of water disasters and geological exploration and other technological progress.


2.Baode coal mine, Shenhua Group, China
New record of underground sub-horizontal in-seam directional drilling has been accomplished by Xi'an Research Institute of CCTEG in Baode Coal Mine. The maximum drilling depth reached 2311 meters. The borehole has 15 sidetracks. Borehole direction was controlled accurately and the trajectory extended inside coal seams. Tremendous high gas drainage efficiency is expected to be achieved.
Borehole trajectory of in-seam directional drilling


3.Sihe coal mine, Jincheng Mineral Group, China
In-site experiment of integrated underground directional drilling equipment and technology has been accomplished in Sihe coal mine (5301 working face). Two long distance boreholes have been drilled. Borehole 1# has maximum depth of 1881m which we believe is the deepest coal mine underground directional borehole. The hole has 11 sidetracks (branches), 7 of them are drilled to detected roof and the rest are drilled to detected floor. Detail track of the borehole can be found in figure 3. Average daily drilling depth reached as high as 210m. 180m average daily drilling depth was maintained even after the borehole depth exceed 1000m. The fact shows that relative high drilling efficiency has been achieved.
Profile map of borehole 1 in Sihe mine experiment