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Problems solved by technology
The same set of drilling tools is used in the deflection section of the horizontal well and the drilling section of the horizontal well. After the deflection section is completed, the drilling direction of the horizontal well is difficult to control during the drilling of the horizontal well, and large deviations are likely to occur; the early research and development All components of the flexible rod are connected by riveting and welding process, which takes time to assemble and is difficult to maintain; the drilling operation uses positive circulation to deliver drilling fluid to the drilling tool, which is prone to "sand stuck" accidents and reduces production efficiency
Method used
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Embodiment 1
[0041] 1. Assemble various tools of the present invention:
[0042] (1) First, assemble the deflection rotation assembly 1, as shown in Figure 3, put the righting bearing 14, the pressure bearing 16, the collar 13, and the oil seal 17 into the outer casing 18 in sequence, and penetrate the central shaft 12, and put the drill bit 11 is connected to the front end of the central shaft 12 by means of a screw, the triangular pad iron 15 is welded on the jacket 18, and then the deflection rotation assembly 1 is welded to the front end of the directional follow-up guide tube 4;
[0043] (2) Assemble the horizontal rotation assembly 2, as shown in Figure 4, put the righting bearing 23, the pressure bearing, the collar and the oil seal into the outer cover 25 in sequence, penetrate the central shaft 22, and connect the drill bit 21 with a screw thread. At the front end of the central shaft 22, the rectangular pad iron 24 is welded on the outer sleeve 25, and the inner spline 39' of the...
Embodiment 2
[0053] Assemble each part of the present invention.
[0054] (1) The length of the horizontal drilling footage is 45.0m, and the installation length of the flexible drill pipe 3 is 45.0m; each flexible rod is 150mm, and the inner ball 31 is made of 40 chromium nickel molybdenum material;
[0055] (2) The directional follow-up guide pipe 4 is made of a seamless steel pipe with a slit width of 4mm and a slit spacing of 110mm. A 70mm wide pipe wall is left as a rib at the lower part of the steel pipe.
[0056] Drilling process
[0057] Mill out a 1.3m window on the well casing wall at the design depth of the oil well;
[0058] The bending degree of the flexible drill pipe is 18° / m, and the deflection angle is 90°. When drilling 5.0m, the radius of curvature R=5.0×4÷2π=3.18; it also belongs to the category of ultra-short radius deflection technology.
[0059] Other parts manufacture and drilling process are all the same as embodiment 1.
Embodiment 3
[0061] Assemble each part of the present invention.
[0062] (1) The length of horizontal drilling footage is 98.0m, and the length of each flexible rod is 140mm. A 98.0m long flexible drill pipe is assembled, and the inner ball is processed by 42 chromium molybdenum;
[0063] (2) The slit width of the directional follow-up guide pipe 4 is 4 mm, and the slit spacing is 105 mm; 60 mm of the pipe wall is left as ribs at the lower part of the slotted pipe.
[0064] Drilling process
[0065] The bending degree of the flexible drill pipe is 22° / m, and the deflection angle is 90°. When drilling 4.1m, the curvature radius R=4.1×4÷2π=2.61m.
[0066] Other parts manufacture and drilling process are all the same as embodiment 1.
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Abstract
The invention relates to a radial horizontal drilling and well completion tool with super-short radius and the process, belonging to the oil exploitation industry. It adopts deflecting drilling tool and horizontal drilling tool to drill well. The deflecting drilling tool comprises guide pipe, locating drilling bit and soft drilling bar. The horizontal drilling tool comprises horizontal rotary assembly, soft drilling bar, guide pipe, bushing with concave reversing thread and convex collar. It is characterized in that on the sleeve of deflecting rotary assembly triangle padding iron is set and the tail of deflecting rotary assembly is connected with the soft drilling bar by nut; quick coupling matched with the horizontal rotary assembly is set on the soft drilling bar; bushing with concave reversing thread and convex collar are set at the tail pipe; each segment of soft bar is 140-150mm; outer spline is set at the front end of inner ball; inner spline is set on the body and is fixed by nut; the ball is set in ball bowl and body; each segment of soft bar can bend in 3-6: ; joint spacing of slotting steel pipe following the guide pipe is 100-110mm and the joint width is 3.5-4.0mm. the invention is provided with ultra-short radius of horizontal drilling well, high accuracy, short drilling period and high efficiency. It can be used in oil exploitation, gas and running water industries.
Description
technical field [0001] The invention relates to the field of oil exploitation, in particular to a special tool for oil field drilling and an oil extraction construction process thereof. Background technique [0002] Although many achievements have been made in the research and development of drilling tools for ultra-short-radius horizontal wells in oil production, there are still many unsolved technical problems. The same set of drilling tools is used for the deflection section of the horizontal well and the drilling section of the horizontal well. After the deflection section is completed, the drilling direction of the horizontal well is difficult to control during the drilling of the horizontal well, and large deviations are likely to occur; the early research and development All components of the flexible rod are connected by riveting and welding process, which takes time to assemble and is difficult to maintain; the drilling operation uses positive circulation to deliver...
Claims
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Application Information
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