Sand fishing device
A technology of outer cylinder and mandrel, which is applied in the direction of wellbore/well components, earthwork drilling and production, etc., and can solve the problem of low sand fishing efficiency
Active Publication Date: 2017-01-25
PETROCHINA CO LTD
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Problems solved by technology
[0004] The invention provides a sand dredging device to solve the problem of low sand dredging efficiency
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[0054] The accompanying drawings shown below are used to provide a further understanding of the present invention, and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but not to limit the present invention.
[0055] figure 1 It is a structural schematic diagram of a sand dredging device provided by an embodiment of the present invention. Such as figure 1 As shown, the sand dredging device of this embodiment includes: a mandrel 1, an outer cylinder 6, an inner cylinder 12 arranged in the outer cylinder 6, a drill bit 15, a short joint 19 of the outer cylinder, a sliding sleeve 4 and a ball seat 5;
[0056] The mandrel includes a first section and a second section, the first section is connected with the inner cylinder 12, the inner wall of the second section is provided with a sliding sleeve 4, and the side wall of the second section of the mandrel 1 is provided with a th...
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The invention provides a sand fishing device. The sand fishing device comprises a mandrel, an outer barrel, an inner barrel arranged in the outer barrel, a drill bit, an outer barrel nipple, a sliding sleeve and a ball base; the mandrel comprises a first section and a second section, the first section is connected with the inner barrel, the sliding sleeve is arranged on the inner side wall of the second section, a through hole is formed in the side wall of the second section of the mandrel, the outer side wall of the sliding sleeve is attached to the inner side of the second section, the sliding sleeve is fixedly connected with the mandrel, a first groove is formed in the side wall of the sliding sleeve, the outer barrel nipple is arranged on the second section in a sleeving mode, the outer barrel nipple is in key connection with the mandrel through steel balls, one end of the outer barrel nipple is connected with one end of the outer barrel, the other end of the outer barrel is connected with the drill bit which is internally provided with a seal structure, a second groove matched with the through hole is formed in the side wall of the outer barrel nipple, the steel balls are arranged in a space formed by the through hole and the second groove, the second groove is located below the first groove, and the ball base is arranged in the mandrel and connected with one end of the sliding sleeve. Therefore, the sand fishing efficiency is improved.
Description
technical field [0001] The invention relates to the technical field of sand dredging tools, in particular to a sand dredging device. Background technique [0002] After the oil wells are put into production, due to the influence of formation factors or well completion structures, a considerable part of the wells will produce sand in the oil layers. Along with the deposition of oil layer sand in the wellbore, it will cause the oil layer to be buried after accumulating to a certain extent, seriously affecting the normal production of the oil well, so it is necessary to carry out sand removal operation. [0003] At present, the method of hydraulic sand washing is generally adopted to remove the sand accumulation in the well. Hydraulic sand washing is to use high-speed flowing liquid to disperse the sand at the bottom of the well, and use the carrying capacity of the liquid flow to carry the dispersed sand out of the well. This method works better when the formation pressure is...
Claims
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IPC IPC(8): E21B27/00
Inventor 李元斌练以峰黄世财雷军张雪松崔航波刘双伟秦玉萍李辉刘浩邹克元徐路李栋
Owner PETROCHINA CO LTD