CN211500537U

CN211500537U - Downhole bidirectional reaming micro-expander

Info

Publication number: CN211500537U
Application number: CN201820201494.3U
Authority: CN
Inventors: 祝效华; 李佳南; 毛宇; 童华
Original assignee: Southwest Petroleum University
Current assignee: Southwest Petroleum University
Priority date: 2018-02-06
Filing date: 2018-02-06
Publication date: 2020-09-15
Anticipated expiration: 2028-02-06

Abstract

The utility model relates to a two-way reaming expands ware in pit that oil and gas drilling operation used a little. The technical scheme is as follows: threads are processed at two ends of the tool body and connected with a downhole drill string; a groove is processed in the middle of the tool body, eight spiral edges, two reaming cutting edges, two back reaming cutting edges and four grinding edges are processed on the groove; dovetail groove openings are processed between every two cutting edges on the same circumference; cutting teeth are inlaid on the eight spiral edges. The utility model discloses can clear away little dog leg and little step in the pit, effectively enlarge the well diameter, reduce the reaming time among the conventional drilling process to ensure that operations such as tripping, electricity survey, lower casing are safe smooth.

Description

Downhole bidirectional reaming micro-expander

Technical Field

The utility model relates to an underground reaming tool, especially an underground bidirectional reaming micro-reamer, that oil and gas drilling used.

Background

Along with the deep exploitation of petroleum and natural gas, the problems encountered in drilling operation become more and more complex, and when encountering expansive shale or soft shale with creep property and other formations easy to be reduced in diameter, the drilling tool jamming accidents caused by the reduction in the diameter of a borehole and the irregularity of the borehole often occur, or the situations of difficult casing running caused by narrow annular space of a casing are encountered. The conventional method can only carry out long-time reaming operation in the drilling process or the tripping process so as to achieve the purposes of reducing diameter and trimming well wall, ensure the smooth operation of drilling and casing running, but consume a large amount of manpower and material resources and have higher comprehensive cost.

Reaming-while-drilling technology is developed in such a background, but the conventional reamer has a complex structure and is difficult to master an operation procedure. The utility model provides a two-way reaming expands ware a little in pit can effectively solve above-mentioned problem, and simple structure, convenient operation, and the security is high.

Disclosure of Invention

The utility model aims at providing a ware is expanded a little to two-way reaming in pit can clear away little dog leg and little step in the pit, effectively enlarges the well diameter, reduces the reaming time of conventional well drilling in-process to ensure that operations such as tripping, electricity survey, lower casing pipe are safe smooth.

In order to achieve the above object, the present invention provides a technical solution to the above problems: a downhole bidirectional reaming micro-expander comprises a tool body, a reaming cutting edge, a reverse reaming cutting edge, a trimming and grinding edge, cutting teeth and the like. The structure is characterized in that: threads are processed at two ends of the tool body and connected with a downhole drill string; a groove is processed in the middle of the tool body, eight spiral edges are processed on the groove, and the reaming cutting edges and two polishing edges are uniformly distributed on the same circumference; the back reaming cutting edge and the other two grinding edges are also uniformly distributed on the same circumference; the two reaming cutting edges and the two reverse reaming cutting edges are symmetrically distributed, and the four grinding edges are symmetrical in pairs; dovetail groove openings are processed between every two cutting edges on the same circumference; cutting teeth are inlaid on the eight spiral edges. The two reaming cutting edges 2 and the two back reaming cutting edges 3 are the same in shape, the maximum outer diameter is larger than the outer diameter of the grinding edge 4, and the overall drift diameter is smaller than the drift diameter of a used drill.

The utility model has the advantages that: (1) the well diameter is effectively enlarged, the reaming time in the conventional drilling operation is reduced, and the pure drilling timeliness of the drilling operation is improved; (2) the underground micro dog legs and small steps can be removed, and the safety and smoothness of operations such as tripping, electrical measurement, casing running and the like are ensured; (3) the double-cutting structure can realize front reaming and back reaming, and the operation is more efficient; (4) the tool has the advantages of simple structure, convenient operation, reliable stability and durability, and great saving on well construction cost.

Drawings

Fig. 1 is a schematic structural view of the downhole bidirectional reaming micro-expander of the present invention.

Fig. 2 is a schematic sectional view of the downhole bidirectional reaming micro-expander in the direction of a-a.

Fig. 3 is a schematic cross-sectional view of the downhole bidirectional reaming micro-expander in the direction B-B.

In the figure: 1. the tool comprises a tool body, 2, a reaming cutting edge, 3, a back reaming cutting edge, 4, a grinding edge and 5, a cutting tooth.

Detailed Description

As shown in fig. 1, the utility model relates to a two-way reaming micro-reamer in pit comprises tool body 1, reaming cutting edge 2, chamfering cutting edge 3, coping edge 4, cutting teeth 5 etc.. The structure is characterized in that: threads are processed at two ends of the tool body 1 and connected with a downhole drill string; a groove is formed in the middle of the tool body, eight spiral edges are formed in the groove, and the reaming cutting edge 2 and two of the grinding edges 4 are uniformly distributed on the same circumference; the back reaming cutting edge 3 and the other two trimming and grinding edges 4 are also uniformly distributed on the same circumference; the two reaming cutting edges 2 and the two reverse reaming cutting edges 3 are symmetrically distributed, and the four grinding edges 4 are symmetrical in pairs; dovetail groove openings are processed between every two cutting edges on the same circumference; cutting teeth 5 are embedded on all the eight spiral edges.

The tool is directly connected to a drill string and is lowered into a borehole together with a downhole drilling tool to begin drilling. In the drilling process, the reaming cutting edges 2 are respectively reamed in the axial direction and the radial direction, and the polishing edges 4 are used for repairing the reamed well wall; eight spiral edges and dovetail groove openings designed according to hydrodynamics are beneficial to discharge of hole-expanding rock debris and cleaning of a deposited rock debris bed; and during the tripping operation, the back reaming cutting edges 3 perform secondary reaming on the reamed borehole, so that the tripping operation is ensured to be performed smoothly. After secondary reaming, the borehole diameter is effectively enlarged, the borehole wall is smooth, and the borehole is regular; the success rate of the electrical measurement at one time is improved, the casing running operation is safe and efficient, and the well building time is greatly saved.

The foregoing is illustrative of the present invention, and is not intended to limit the scope of the invention. Any person skilled in the art should understand that they can make equivalent changes and modifications without departing from the spirit and principle of the present invention.

Claims

1. A downhole bidirectional reaming micro-expander comprises a tool body (1), a reaming cutting edge (2), a reverse reaming cutting edge (3), a dressing edge (4), cutting teeth (5) and the like; the structure is characterized in that: threads are processed at two ends of the tool body (1) and are connected with a downhole drill string; a groove is formed in the middle of the tool body, eight spiral edges are formed in the groove, and the reaming cutting edge (2) and two of the grinding edges (4) are uniformly distributed on the same circumference; the back reaming cutting edge (3) and the other two trimming and grinding edges (4) are also uniformly distributed on the same circumference; the two reaming cutting edges (2) and the two reverse reaming cutting edges (3) are symmetrically distributed, and the four grinding edges (4) are symmetrical in pairs; dovetail groove openings are processed between every two cutting edges on the same circumference; cutting teeth (5) are inlaid on the eight spiral edges.

2. The downhole bi-directional reaming micro-reamer of claim 1, wherein: the two reaming cutting edges (2) and the two reverse reaming cutting edges (3) are the same in shape, the maximum outer diameter is larger than the outer diameter of the grinding edge (4), and the overall drift diameter is smaller than the drift diameter of a used drill.