High - precision butt - connected well technology —— drilling underground " navigation"

Since ancient times there has been a saying called " heaven easily into the difficult". Humans can use astronomical telescopes to observe hundreds of thousands of light-years away from the vast space, but below the surface, our feet in the depths of the land is still confused, tens of thousands of meters below the surface or even thousands of meters deep there are challenges. So, can you imagine a " pin lead" in the ground several kilometers deep?

Now, we really realize this kind of underground " through needle lead" - high precision docking connected well technology, drilling underground " navigation", is the group of wells hundreds of meters or thousands of meters apart in the underground seam connection technology. The core of this technology is the " huimagnetic" high-precision medium target guidance system, which originates from the " high - precision directional drilling medium target system research" project undertaken by exploration. The project was initiated by the China geological survey in 2008. the purpose of the project is to establish a directional drilling medium target model through experimental research, guide drilling into the target area, and realize accurate medium target.

In recent years, the geological survey of China has been fully supporting and supporting the development and breakthrough of the technology. at present, the achievements of the " smart magnetic" high-precision medium target guidance system " have completely independent intellectual property rights, breaking the technological monopoly of foreign companies, making the exploration institute the first in China and the second unit with the technology after the United States in the world, reaching the international leading level. At the same time more advanced than the United States: the first low-voltage rechargeable battery power supply, can be used in coal mines and other high-risk operating environment ( us instruments using 220 v power supply, not suitable for coal mines and other uses ); It is 42 mm in diameter and 1.4 m in length, respectively, and can be used to run through a 60 mm diameter center pipe ( 45 mm, 1.9 m in U.S instruments, minimum for 73 mm diameter center pipe ) down to the bottom of the well to complete directional well guidance with a smaller radius of curvature.

When it comes to " hui magnetic" technology, have to talk about its inventor - exploration oriented drilling room director professor Hu hanyue and his team, for many years engaged in the research and development of directional drilling technology, with the geological man's one share does not agree, resolute persistent enthusiasm will practice and scientific research, practice in scientific research, scientific research practice repeatedly, finally developed a successful " hui magnetic" high precision target guidance system, achievement transformation is outstanding. " hui magnetic" success of the news came out, it caused a lot of vibration in the circle, the original take advantage of the technology of similar products in the United States immediately by providing technical services to reduce the price to sell instruments, but also struggle. At present, Hu hanyue is in turkey all the year round to preside over the project of water-soluble brine collection in docking wells, and continues to upgrade " huimagnetic".

Target guide system in " huimagnetic" drilling

Service " the belt and road initiative" strategy —— Chinese technology takes root in turkey

In the national " the belt and road initiative" strategy, turkey has a significant geographical position as an important node across Eurasia. In 2009, the " huimagnetic" high-precision medium target guidance system was first applied to the actual well measurement in bepypazari trona brine acquisition project in northwest Ankara, turkey. Nearly 200 million tons of trona are stored in a 20 - square - kilometer hilly area. In 2009 - 2010, the exploration institute successfully completed the construction of 23 butt wells in cooperation with local alkali mines. The well group types include three well group, four well group and two channel well group.

With the success of the first application, " huimagnetic" drilling guidance system began to participate in a large number of docking target operations. In 2014, the institute, as an independent contractor, signed phase iv and phase v contracts for the beypazari trona mine drilling project for a total of 145 wells, all with the expected results. The construction completed the largest drilling project in the world at that time using the water-soluble mining method of docking wells.

On September 10, 2015, the underground project of Kazan trona in turkey, undertaken by the exploration, marked the official opening of the largest water-soluble brine collection project for docking wells in the world. The core technology adopted is " huimagnetic" technology. the project will construct a total of 74 brine extraction horizontal well groups in three years from 2015 to 2018, with a total of 222 single wells, aiming to provide brine for the annual output of 2.5 million tons of soda ash plant in Kazan trona mine.

The successful application of " huimagnetic" in turkey docking well project, creative design and realization of multi-well group connection, truly realize the underground " penetration" technology, make the exploration of underground docking well technology in the leading position at home and abroad. At the same time, it is also a bold innovation to overcome the difficulties of complex stratum structure, abnormal geomagnetic field, serious stratum breakage and other difficulties in the construction of the exploration site, which lays a solid foundation for the promotion and contracting of international projects to other countries in the future.

Service for new energy exploitation - development and application of coal bed methane exploitation

Since the introduction of rmrs rotary magnetic distance measurement system produced by vector company in the field of coalbed methane horizontal docking wells, the construction technology of directional docking wells in the field of coalbed methane and water-soluble mining in China has made a significant breakthrough. However, most applications are still limited to the traditional u - shaped well group, which is composed of a vertical well and a horizontal well. the ds well group of liujin coalbed methane project of huajin coking coal mine is a coalbed methane well group composed of two horizontal wells. due to the advantages of no external power supply, small volume, Chinese software interface and so on, the target guide system in " huimagnetic" drilling can accurately measure the azimuth deviation, vertex angle deviation and distance between drill bit and target point. therefore, this coalbed methane well group firstly adopts the target guide system in " huimagnetic" drilling with independent intellectual property rights of exploration to realize " point - to - to - point" docking of two wells. The well group is also the first time in China to use surface construction horizontal well and roadway construction horizontal well communication project.

By virtue of the high precision performance of the target guiding system in huimagnetic, the system was used in Liulin shaqu coal mine in Shanxi province. the 1500 m deep directional horizontal hole drilled on the ground surface was successfully butted with the horizontal hole with the top angle of 106 degrees drilled in the coal mine roadway, and the " point - to - point" accurate communication effect was achieved. Not only ensures the safety of underground coal mining, but also improves the exploitation and utilization rate of energy. There are two main branches and four lateral branches in the project. the two main branches are connected with the underground gas drainage borehole respectively, and the underground gas pre-drainage is carried out after the connection is successful. At present, one of the branches has entered the trial drainage period. the drainage data show that the daily gas output of the branch is more than 10,000 m3, the drainage gas concentration is more than 90 %, and the maximum gas flow is more than 10 m3 / min. The gas production of the horizontal well has exceeded the expected effect at present. according to the drainage effect of similar wells in the past, the production of the well will continue to climb, and it is expected to create a new gas production record.

Water - soluble mining of service solid mineral —— application of natural alkali ore and salt ore mining

When the water-soluble mining method is combined with the directional butt-joint well technology, a low input, high output, high efficiency, green and environmental protection mining method was born.

In the field of drilling water soluble or hydraulic exploitation of salt, alkali, phosphorus, mirabilite and so on, the directional butt joint well is a method with twice the result with half the effort. Not only that mine investment is small, but also the floor area is minimum, no tailing are generated on the ground surface, and the exploitable depth can reach 3000 meter, so that the method is undoubtedly a green and environment-friendly mining method.

In November 2014, anpeng trona mine in Henan province, where the exploration is located, used this technology to guide the sp01 horizontal well to realize one-time butt joint connection with its target well, with the vertical depth of the connection point reaching 2850 meters, which is the highest vertical depth record of water-soluble mining in the butt joint well of thin-layer alkaline mine in the world. After the well group is connected, the brine concentration reaches 120 g / l under the condition that the water injection flow rate reaches 60 m3 / h, and the purpose of stable production and high yield is achieved successfully.

The result is a new breakthrough after the exploration institute connected 2800 meters deep well in shalongda salt mine, Hubei province, and a new record of horizontal docking well depth. Anpeng trona deposit in Henan province is one of the large trona deposits found in China, and is the deepest trona deposit in the world. The depth of the seam mined by the horizontal well is more than 2800 meters. the seam is composed of interbedded and interbedded layers with thickness ranging from 0.1 meters to 1 meter. the top, bottom and interbedded layers of the seam are mainly dolostone. And the seam is very unstable, ups and downs are relatively large, electric logging after three times of comparison to determine the seam. In addition to reasonable drilling assembly and wellbore structure, the drilling technology of the exploration institute has adopted special technical methods in the control of wellbore trajectory. Firstly, a wireless inclinometer while drilling is adopted, and secondly, a geological guide instrument is introduced to guide a drill bit; Third, the medium target instrument adopts the deep hole high temperature magnetic medium target instrument developed by exploration. Practice shows that the instrument has achieved a successful target guidance. This mode of close combination of industrial production and scientific research results has played a strong demonstration role in the future scientific research work of the exploration institute.

In China, the target guidance system in " huimagnetic" drilling produced by exploration has become the standard of water-soluble mining drilling equipment, and is playing a more and more important role. According to incomplete statistics, since the success of the first trial of the " hui magnetic" system in 2009, more than 100 times of docking connection guidance operations have been successfully completed, and 100 % connection has been achieved. In the field of saline-alkali brine production well docking, the market share of " huimagnetic" exceeds rmrs instrument in the United States by a large advantage.

Opening up a new field of service - avoiding obstacles, preventing collision and guiding roadway drivage

Obstacle avoidance and collision prevention: in the drilling area, there are sometimes abandoned wells or other underground pipelines that need to be avoided during drilling. at this time, the drilling can be guided to avoid these obstacles by means of magnetic guidance technology. Good news came from Lushun, Dalian, on April 4, 2013, when Beijing wandi geological engineering co., ltd successfully completed the oblique obstacle avoidance project implemented by hot water wells with buried drilling accidents due to geological reasons. The project requires bypassing the position of the accident head at the well depth of 1394 m, the accident formation is phyllite, the hardness is 7 - 8 grade, and the drilling speed of conventional drilling is only 20 - 30 cm / H. the successful implementation of the obstacle avoidance project fully demonstrates the strong technical strength and teamwork spirit of the exploration institute, and opens up a new application field for directional drilling technology.

The success of that " smart magnetic" drill guide system can also be used to guide communication between the borehole and the roadway. In February 2014, the " huimagnetic" drilling guidance system of the exploration institute successfully guided the tunneling of yangjiawan iron ore mine in Lushi county, Sanmenxia city, Henan province, so as to realize its communication with the borehole. In the previous process of drilling and roadway penetration, due to the borehole inclination by ferromagnetic metal ore interference, communication failure. After arriving at the construction site, the technical personnel of the exploration institute provided the owner with the deviation measurement results of the borehole relative to the roadway after 7 hours of underground roadway and ground survey operation. The owner according to the measurement results provided by the roadway drivage, only in more than 1 day time to make the roadway and borehole communication.

Service for mine rescue —— the first attempt of " huimagnetic" system in mine rescue is completed

After the success of drilling and rescue in Chile's mine disaster, the exploration institute has proposed a set of technical scheme for positioning and guiding the rescue hole orientation of the trapped personnel in the mine by using the " hui - magnetic" system: a magnetic beacon device is preset in the mine, which can be started by the trapped personnel after the mine disaster occurs, and the magnetic beacon can emit magnetic signals outwards for more than 30 days continuously, so as to prompt the underground survivors and their positions, and accurately guide the surface rescue hole to drill into the trapped area, thus improving the rescue effect and efficiency.

At the rescue site of the collapse accident in yurong gypsum mine, Pingyi city, Shandong province, the technical personnel of the exploration institute put forward the above scheme, completed the technical preparation and ground verification of the site implementation as an alternative scheme, obtained the high recognition of the national production safety rescue emergency command center and engineering construction unit, and put the magnetic beacon into the well into the hands of trapped miners. Finally, the successful penetration of life-saving well can not be implemented, but completed the first attempt of " hui magnetic" system in mine rescue in China, which provides a high-tech means for mine rescue.

Since the successful connection of the first pair of wells at the Turkish construction site in October 2009, the application field of the " huimagnetic" medium target guidance system is constantly expanding and the technical level is constantly improving. From the foreign drilling market to the domestic drilling market, from trona ore to salt mine, and then to the field of coal bed methane, breaking the foreign similar product technology monopoly, gradually formed the localization of technical service advantage, make the exploration of directional drilling field in the forefront of the industry.

At present, under the support of the special fund for scientific research of the public welfare industry of the geological survey of China, the exploration institute is carrying out the upgrading of the deep-hole high-temperature magnetic medium target system " hui magnetic". the results will play an important role in the future shale gas exploration and development market, the development and application of underground thermal energy, the development and application of mine rescue wells, and provide solid and powerful technical support for shale gas exploration and development, underground thermal energy development, mine rescue and other aspects of China.