Flexible ultra-short radius drilling tool
A technology of ultra-short radius drilling tools, applied in drill bits, drill pipes, drill pipes, etc., can solve the problems of short tool life and low overall construction efficiency of ultra-short radius drilling, so as to achieve long life and improve overall efficiency. , The effect of the ability to transmit loads is large
Pending Publication Date: 2018-03-16
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology
According to the different properties of the casing, cement sheath and formation rock, the existing technology uses two kinds of flexible drilling tools for operation. Drilling a hole requires multiple trips. Among them, the casing cement sheath milling tool has flexible deformation and load transmission. Realized through the same structure, because the structural size is limited by the space in the casing, the excessive frictional resistance of the flexible deformation of the tool often leads to a short tool life, which in turn leads to low overall construction efficiency of ultra-short radius drilling in the casing
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Embodiment Construction
[0020] The present invention is described in detail below in conjunction with accompanying drawing:
[0021] like figure 1 As shown, a flexible ultra-short radius drilling tool mentioned in the present invention includes a threaded joint 1, a fixed pin 2, a ball head rod 3, a ball socket housing 4, a ball rod housing 5, a torsion spring 6, a support The ball socket 7, the drill bit 8; the supporting ball socket 7, the ball head rod 3, the ball socket housing 4, the ball rod housing 5 and the fixing pin 2 cooperate with each other to form a hinge joint, wherein: the supporting ball socket 7 is embedded in the mutual plugging The ball socket housing 4 is fixedly connected by the fixed pin 2. The ball head part of the ball stud 3 can rotate freely within a certain range relative to the ball socket part of the ball socket housing 4. The ball stud rods 3 are inserted into each other and passed through the fixed pin. 2. It is fixedly connected with the club shell 5, and the two end...
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The invention discloses a flexible ultra-short radius drilling tool which includes a threaded joint, a fixing pin, ball rods, a ball socket casing, ball rod casings, transmission torsion springs, a supporting ball socket and a drill head. The supporting ball socket, the ball rod, the ball socket casing, the ball head casing and the fixing pin are matched with each other to form hinge joint sections. The supporting ball socket is arranged in the ball socket casings in mutual inserted connection with each other, and the ball rods are in mutual inserted connection and are fixedly connected with the ball rod casings. The plurality of hinge joint sections are in series connection, and the head end and the tail end of each hinge joint section are fixedly connected with the threaded joint and thedrill head respectively, to form a flexible shaft structure of the tool. The plurality of transmission torsion springs sleeve the flexible shaft structure. According to the flexible ultra-short radius drilling tool, independent structures are adopted to transmit torsion and anti-pressure loads. In ultra-short radius drilling operation in a sleeve, the service life of the tool is long, a transmitted load is high, the tool can continuously drill the sleeve, a cement ring and rock with a certain depth in the ultra-short radius drilling operation in the sleeve, and overall efficiency of the ultra-short radius drilling in the sleeve can be effectively improved.
Description
technical field [0001] The invention relates to the technical field of wellbore engineering tools in oil and gas fields, in particular to a flexible ultra-short radius drilling tool. Background technique [0002] The ultra-short radius drilling technology in the casing can provide multiple oil and gas channels for the oil well, increase the oil drainage area, and effectively improve the oil and gas recovery; compared with the traditional perforation technology, the ultra-short radius drilling technology in the casing can not only obtain a higher Deep oil and gas channels, while avoiding the pollution of the formation and the damage to the casing and cement sheath, the production increase effect is remarkable. According to the different properties of the casing, cement sheath and formation rock, the existing technology uses two kinds of flexible drilling tools for operation. Drilling a hole requires multiple trips. Among them, the casing cement sheath milling tool has flexibl...
Claims
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IPC IPC(8): E21B29/06E21B17/20E21B17/042E21B17/046E21B10/60E21B10/54
CPCE21B10/54E21B10/60E21B17/0426E21B17/046E21B17/20E21B29/06
Inventor 宿振国王瑞和
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)