Giant while-drilling inner bailing bucket

Abstract

The invention discloses a giant while-drilling inner bailing bucket. The giant while-drilling inner bailing bucket comprises an upper connector, an inner bucket, an outer bucket and a reverse circulation mill shoe, the upper connector is connected with the top of the outer bucket, the inner bucket is arranged in the outer bucket, the top of the reverse circulation mill shoe is connected with the bottom of the outer bucket, a through hole is formed in the center of the reverse circulation mill shoe, the top of the through hole is communicated with the bottom of an inner pipe, a ball seat is arranged in the middle of the through hole, the side wall of the reverse circulation mill shoe is provided with a circle of inner overflow cavity, the top end of the inner side of the reverse circulation mill shoe is provided with a plurality of inner overflow inlets, the inner overflow inlets are communicated with the top end of the inner overflow cavity, the bottom end of the outer side of the reverse circulation mill shoe is provided with a plurality of reverse circulation holes communicated with the bottom end of the inner overflow cavity, a check valve is arranged on the edge of the top of the reverse circulation mill shoe, inner circulation holes are formed in the side wall of the reverse circulation mill shoe, the bottoms of the inner circulation holes are communicated with a through hole below the ball seat, and the tops of the inner circulation holes are communicated with the bottom of the check valve. The giant while-drilling inner bailing bucket can reduce the construction cost, protect oil-yielding stratum position, and improve the bailing efficiency.

Description

technical field [0001] The invention relates to the technical field of drilling and workover in oilfields, in particular to a giant inner canister while drilling. Background technique [0002] At present, the production layer pressure coefficient of many production oil wells in domestic oilfields is low, and the liquid level is generally between 1000-2000m. The quantity will be exhausted or even discontinued. [0003] Existing sand fishing methods include: circular well washing sand fishing method, sand fishing by suction canister, sand fishing by split giant fishing cup while drilling, etc. The sand fishing method of circular well washing is carried out by pump truck The construction cost of sand washing operation is high. If there is a leakage layer in the upper part of the oil well, other measures must be taken to carry out the construction. Therefore, the operation cost is high, and the well washing fluid will also cause damage to the formation to varying degrees, which...

AI Technical Summary

Problems solved by technology

[0002] At present, the production layer pressure coefficient of many production oil wells in domestic oilfields is low, and the liquid level is generally between 1000-2000m. The quantity will be exhausted or even discontinued

[0003] Existing sand fishing methods include: circular well washing sand fishing method, sand fishing by suction canister, sand fishing by split giant fishing cup while drilling, etc. The sand fishing method of circular well washing is carried out by pump truck The construction cost of sand washing operation is high. If there is a leakage layer in the upper part of the oil well, other measures must be taken to carry out the construction. Therefore, the operation cost is high, and the well washing fluid will also cause damage to the formation to varying degrees, which is not conducive to the next oil well. Mining; the use of suction-type fishing barrels in the process of sand fishing in the downhole can not be drilled, ground and reamed, and downhole accidents such as sticking are prone to occur; in the process of downhole operations using the split giant fishing cup while drilling, more drilling fluid is consumed , and the sand fishing efficiency is low and the cost is high

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