Double-layered casing windowing drillbit

A double-layer casing and drill bit technology, applied in drill bits, drilling equipment, earthwork drilling, etc., can solve the problems of long window opening period, high casing steel grade strength, low window opening success rate, etc., to improve cutting performance and wear resistance, prolong service life, and solve the effect of low success rate

Active Publication Date: 2013-02-27
SOUTHWEST PETROLEUM UNIV
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AI Technical Summary

Problems solved by technology

Due to the large size of the double-layer casing, the thickness of the casing wall, and the high strength of the casing steel grade, it is difficult for ordinary single milling cones to penetrate the two-layer metal casing, the reliability is poor, the success rate of window opening is low, and the window opening cycle Long, greatly reduces the efficiency of double-layer casing sidetracking and increases drilling costs

Method used

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  • Double-layered casing windowing drillbit
  • Double-layered casing windowing drillbit
  • Double-layered casing windowing drillbit

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with accompanying drawing, protection scope of the present invention is not limited to the following:

[0021] Such as figure 1 , figure 2 , Figure 4 As shown, a double-layer casing window opening drill bit includes a first-level drill bit base body 1, and a first-level drill bit base body 1 is provided with an upper joint 11 and a first-level cutting part 8 connected in sequence, and the first-level cutting part 8 includes a cylindrical The cloth tooth surface 9, the tapered tooth cloth surface 10 and the bottom end surface 12, the outer surface of the primary cutting part 8 are also provided with tooth grooves 20 and water grooves 21 extending in the axial direction, and it also includes a secondary drill base 2, two The base body 2 of the drill bit is provided with a joint 13, a secondary cutting part 14 and a lower joint 15 which are sequentially connected. The upper joint 11 is connected with ...

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Abstract

The invention discloses a double-layered casing windowing drillbit. The drillbit comprises a primary drillbit basic body (1) and a secondary drillbit basic body (2), wherein a columnar tooth distribution surface (9), a conical tooth distribution surface (10), a bottom end face (12), a transition folding surface (19) and a tooth socket (20) are formed on the primary drillbit basic body (1), a spiral columnar tooth distribution surface (16) and a spiral tooth socket (17) are formed on the secondary drillbit basic body (2), and hard alloy teeth (3) and a hard alloy block are respectively formed on different positions of the primary drillbit basic body (1) and the secondary drillbit basic body (2). The drillbit has the beneficial effects that the drillbit has the advantages of combining the cutting of both the hard alloy teeth and the hard alloy block, teeth are reasonably distributed in a staggering mode, so that the drillbit can be better suitable for the continuous cutting working condition of double-layered casing windowing process; and the drillbit has the characteristics of high efficiency, long service life and high success ratio, and the technical problems of low double-layered casing windowing success rate and low efficiency are solved.

Description

technical field [0001] The invention relates to the technical field of downhole tools for oil drilling and workover engineering, in particular to a double-layer casing window opening drill bit. Background technique [0002] Double-layer casing window opening is a windowing sidetracking process performed at a certain depth downhole where there are oil layer casings and technical casings at the same time. The restoration of production capacity is also one of the important measures to reduce costs and increase crude oil production (develop remaining oil and gas reservoirs) in the middle and later stages of the oil field. The core of double-layer casing window opening sidetracking technology is to have a reliable high-efficiency window drilling bit. At present, there is no special double-layer casing window drilling bit. The cone is used in double-layer casing window opening operations. For example, Chinese patent 2012100454151 discloses a casing window drill bit for hard form...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/55E21B10/43E21B10/60E21B29/06
Inventor 张德荣孔春岩侯子旭付建红杨兰田周伟贾晓斌
Owner SOUTHWEST PETROLEUM UNIV
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