Double-layer shell screw rod drilling tool motor stator
A technology for screw drilling tools and motor stators, which is used in the manufacture of stator/rotor body, magnetic circuit shape/style/structure, magnetic circuit static parts, etc. problems, to achieve the effect of prolonging the service life, reducing the impact, and having a simple and reasonable structure
Inactive Publication Date: 2013-02-20
BC P INC CHINA NAT PETROLEUM CORP +2
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Problems solved by technology
[0003] In order to overcome the high formation temperature during deep well drilling operations, the rubber bushing of the motor stator of the existing screw drilling tool fails and deforms quickly under high temperature conditions, resulting in short service life of the motor, the invention provides a double-shell screw drilling tool motor stator
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[0015] The present invention will be further described below in conjunction with drawings and embodiments.
[0016] The motor stator of the double-layer shell screw drilling tool of the present invention mainly includes a stator, an upper positioning sleeve 2, and a lower positioning sleeve 5. The stator is composed of a housing 11 and a rubber bushing 12. The rubber bushing 12 can be of equal wall thickness (see attached figure 2 ), can also be of unequal wall thickness (see attached figure 1 ). The rubber bushing 12 is bonded in the housing 11 having the same or substantially the same shape as its outer contour. The upper end and the lower end of the outer casing 1 have threads 3 connected with other parts of the screw drilling tool, usually the upper end is connected with the casing of the bypass valve, and the lower end is connected with the cardan shaft casing.
[0017] First embodiment of the present invention (see attached image 3 ), the upper end of the housing 1...
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The invention relates to a double-layer shell screw rod drilling tool motor stator, aiming at overcoming the defects of high stratum temperature when in deep drilling operation, and short service life of a motor caused by repaid ageing failure of a rubber bushing of the existing screw rod drilling tool motor stator under the condition of high temperature. The upper end of a stator shell (11) is fixedly connected with an upper locating sleeve (2), and the lower end thereof is fixedly connected with a lower locating sleeve (5); the excircle of the shell (11) is smaller than the excircles of theupper locating sleeve (2) and the lower locating sleeve (5); the upper locating sleeve (2) and the lower locating sleeve (5) which are fixedly connected with the shell (11) are fixedly installed at the middle part of the an outer shell (1); heat insulation filler (4) or an axial liquid flow channel (7) is arranged between the excircle of the shell (11) and an inner hole of the outer shell (1); orthe space between excircle of the shell and the inner hole of the outer shell is vacuum. The double-layer shell screw rod drilling tool motor stator has the advantages of being simple and reasonable in structure and convenient for assembly, effectively reducing the influence of the high stratum temperature for a stator, and prolonging the service life of a screw rod drilling tool.
Description
Technical field [0001] The invention relates to a motor stator of a screw drilling tool, in particular to a double-layer casing motor stator of a screw drilling tool. Background technique [0002] The screw drilling tool is a downhole dynamic drilling tool widely used in petroleum drilling, mainly including a bypass valve assembly, a motor assembly, a cardan shaft assembly and a transmission shaft assembly, and is fixedly connected from top to bottom. The motor is composed of a rotor and a stator; the stator is composed of a casing and a rubber bushing, and the outer wall of the rubber bushing is bonded to the inner hole of the casing; the inner hole of the rubber bushing is a continuous spiral shape, and the cross section is a radial uniform petal shape , the number of petal heads is 2 or more, and the upper and lower ends of the shell have threads connected with other parts of the screw drilling tool. At present, the casing of the widely used screw drilling tool stator is...
Claims
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IPC IPC(8): H02K1/12H02K1/20H02K15/02
Inventor 李明谦任宪可陆天明李良君马峰王春阳夏秀文
Owner BC P INC CHINA NAT PETROLEUM CORP