Diamond compact annular concentric simultaneous casing drilling bit and working method thereof

Abstract

The invention relates to a diamond compact annular concentric simultaneous casing drilling bit. The diamond compact annular concentric simultaneous casing drilling bit comprises a center drilling bit, a casing drilling bit and a casing shoe. The center drilling bit is connected with a drilling rod through a drilling rod connector, and the casing shoe is in threaded connection with a casing pipe. The casing drilling bit and the casing shoe are sleeved on the center drilling bit, and the drilling bit end surface of the casing drilling bit is flush with the drilling bit end of the center drilling bit in a stamping mode. The center drilling bit and the casing drilling bit are in a bonding structure, and the center drilling bit rotates around the axis in a unidirectional and limiting mode in the casing drilling bit. The casing drilling bit and the casing shoe are connected in a relative rotation mode around the axis through a sleeved installation method. According to the diamond compact annular concentric simultaneous casing drilling bit, the advantage of efficient rock breaking is fully used, in the process of efficient rock breaking and pushing of the center drilling bit, the casing drilling bit is also efficiently pushed, stratum pushing can be assisted, besides, the center drilling bit and the wall of a drill hole can be protected, coaxiality of the two-step drilling bits is good, guiding and righting supplement each other, bending of the drill hole can not be caused, efficiency of stratum hole drilling can be improved, and service life of the whole drilling tool can be prolonged.

Description

technical field [0001] The invention relates to a diamond composite annular concentric follower pipe drill bit and a working method thereof, belonging to the technical field of formation drilling tools. Background technique [0002] In the drilling construction of many complex strata, hole collapse and buried drilling are often encountered and very troublesome problems for construction personnel. It is difficult to guarantee the quality of drilling and construction efficiency by using conventional drilling techniques. [0003] In order to solve the above technical problems, the industry has adopted the follow-up drilling technology to make a breakthrough improvement on formation drilling tools. With the continuous development of follow-up drilling technology, the existing patents for the improvement of parallel follow-up drill bits include the following four : [0004] (1) Chinese patent CN201851017U discloses a down-the-hole heel pipe concentric reaming drilling tool, incl...

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Problems solved by technology

[0007] (4) Chinese patent CN102787806A concentric tubular drilling tool, which solves the problems of complex structure, difficult manufacturing and assembly, small transmission torque and easy damage of existing drilling tools

[0009] 1. The above four types of drilling tools must be equipped with impactors to impact and break rocks, which greatly restricts the construction scope and environment of the project, and the processing cost is high and the operation is complicated

[0010] 2. The way the drilling tool is connected to the drilling rig is complicated, resulting in a lot of waste

[0011] 3. The annular drill bit and the center drill bit in the above four kinds of drilling tools are all manufactured by the traditional down-the-hole drill bit production process. This kind of down-the-hole drill bit has low drilling efficiency, short service life, complicated processing, slow tooth feeding, and high drilling cost.

[0013] 5. The above four kinds of drilling tools have extremely high quality requirements for drilling tools. Once the quality of the drilling tools is not satisfactory, accidents will occur frequently during the hole making process, greatly increasing the hole making time, and once the transmission pin breaks, the hole will be reamed. the drill will drop to the bottom of the hole

[0014] 6. The drill bits of the above four kinds of drilling tools all use impact drilling, which will not only make the casing easy to deform during hammering, but also make it difficult for the casing to follow the long hole section

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