Large-diameter engineering well holing construction method in super-thick pebble formation

A construction method, pebble floating technology, which is applied in the field of large-diameter engineering well hole-forming construction, can solve the problems of low hole-forming efficiency and drilling tool wear, and achieve the effects of short well-forming period, fast construction progress and high economic benefits

Inactive Publication Date: 2011-04-13
HEBEI CONSTR & INVESTIGATION RES INST
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Problems solved by technology

[0003] The purpose of the present invention is to provide a construction method for drilling holes in large-diameter engineering wells in thick boulder formations, which overcomes the shortcomings of low hole-forming efficiency and serious wear of drilling tools in the prior art, and at the same time avoids underground operations by personnel, ensuring construction Safety

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  • Large-diameter engineering well holing construction method in super-thick pebble formation
  • Large-diameter engineering well holing construction method in super-thick pebble formation
  • Large-diameter engineering well holing construction method in super-thick pebble formation

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Embodiment 1

[0042]The shaft project of Zunhua Wenjiazhuang Iron Mine has a drilling diameter of 8.3m and a drilling depth of 285m. At 231.6-251.0m is the floating pebble layer, the maximum visible particle size is 102cm (the drill bit is carried to the surface when the drill is lifted), and generally 20-80cm. The main component of the floating pebble is quartzite, which is extremely strong and difficult to break. The layers are filled with cohesive soil.

[0043] This layer adopts AD-60 drilling rig to drill the leading hole. The main technical parameters of the drilling rig are shown in Table 2. The drilling diameter is 3.5m and the drilling depth is 285m. After the pilot hole is finished, replace the φ6.3m drill bit for primary reaming, and drop part of the drilling slag and boulders into the pilot hole. After the front pilot hole is filled, lift the drill to move the drill away from the hole, and then install the punching cone bracket. The technical parameters of the bracket are lis...

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Abstract

The invention discloses a large-diameter engineering well holing construction method in super-thick pebble formation. The method comprises the following steps of: (1) protecting a wall by using slurry, and drilling a front guide hole by using a slewing drilling machine; (2) after the slewing drilling machine drills through the bottom of the pebble formation, and replacing a bit to perform ream drilling; (3) filling fallen pebbles and drilling slag obtained through ream drilling into the front guide hole and lifting the bit; (4) manufacturing a grabbing awl; (5) mounting a derrick and the grabbing awl in place to perform grabbing and drilling; and (6)grabbing the pebbles out of the holes by using the grabbing awl, and normally drilling by using the slewing drilling machine so as to form a hole. By combining slewing drilling machine drilling and holing technology with grabbing awl grabbing and holing technology, the problem of holing in a formation containing pebbles with the diameter of over 1m in the large-diameter engineering well construction can be solved. In the method, degree of mechanization and automation is high, construction progress is fast, the well completion period is short and a drilling tool is slightly abraded, and the engineering cost is effectively reduced; and compared with that of the traditional process, the holing speed of the pebble formation can be improved by over 30 percent.

Description

technical field [0001] The invention relates to a construction method for forming holes in large-diameter engineering wells in huge-thick boulder formations, and belongs to the technical field of construction. Background technique [0002] At present, there are mainly two methods for the construction of the floating pebble layer in large-diameter engineering wells in China: one is to use a large-scale engineering drilling rig to drill into the floating pebble layer with a hob bit or a scraper bit. Rolling, slipping, floating pebbles are not easy to break, poor drilling occurs, etc., the drilling efficiency is low, and the drilling tools are severely worn, which increases the project cost. At the same time, due to the large particle size of the boulders, they cannot be discharged from the hole in time, resulting in More and more large-diameter boulders accumulate in the hole, making drilling more difficult; the second is the freezing method, which requires manual downhole ope...

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Application Information

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IPC IPC(8): E21B3/00E21B10/26E21B1/00E21B1/02
Inventor 梁金国商卫东王华明张鹏张军旗王德亮夏文超
Owner HEBEI CONSTR & INVESTIGATION RES INST
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