Hydraulic rotary casing guide shoe

Abstract

The invention discloses a hydraulically-operated rotary casing guide shoe, and belongs to an assorted tool for a casing pipe in petroleum drilling operation. The hydraulically-operated rotary casing guide shoe comprises a hollow hanging shell (1), a rotary shaft (5) and a rotary sleeve (6), wherein a casing pipe joint (2) is arranged at the rear end of the hanging shell (1), and a hollow eccentric guide shoe head (3) is arranged at the front end of the hanging shell (1); an axial eccentric hole (31) is formed at the front end of the eccentric guide shoe head (3), and the tail end of the eccentric guide shoe head (3) extends into a cavity inside the hanging shell (1); a plurality of through holes at the tail end of the eccentric guide shoe head (3) are communicated with a cavity inside theeccentric guide shoe head; the rotary shaft (5) and the rotary sleeve (6) are arranged inside the hanging shell (1); one end of the rotary sleeve (6) is fixed to the tail end of the eccentric guide shoe head (3); and a gap is reserved between the other end of the rotary sleeve (6) and the rotary shaft (5). The externally-hung hydraulically-operated rotary casing guide shoe has a simple structure,can be used in various petroleum drilling occasions, is suitable for industrial production and is easy to popularize.

Description

technical field [0001] The invention relates to a supporting tool for oil drilling operation casing, more specifically a hydraulic rotary casing guide shoe. Background technique [0002] In the process of oil drilling operations, considering that the casing has a certain rigidity and the outer diameter is larger than the outer diameter of the drilling tool, it is easy to encounter obstructions and complex situations during the cementing operation of the casing, prolonging the cementing operation cycle and high operating risks . Generally, a casing guide shoe is installed on the top of the casing to assist in the process. The casing guide shoe is a conical or cannonball-shaped short joint connected to the bottom of the casing. Scraping of wellbore mud, sand and rocks at the bottom of the casing will cause casing blockage and lowering to be blocked. However, the casing guide shoes of the existing structure are generally arc-shaped head structures made of drillable materials i...

AI Technical Summary

Problems solved by technology

[0002] In the process of oil drilling operations, considering that the casing has a certain rigidity and the outer diameter is larger than the outer diameter of the drilling tool, it is easy to encounter obstructions and complex situations during the cementing operation of the casing, prolonging the cementing operation cycle and high operating risks

Generally, a casing guide shoe is installed on the top of the casing to assist in the process. The casing guide shoe is a conical or cannonball-shaped short joint connected to the bottom of the casing. Scraping of wellbore mud, sand and rocks at the bottom of the casing will cause casing blockage and lowering to be blocked. However, the casing guide shoes of the existing structure are generally arc-shaped head structures made of drillable materials in order to realize the guiding function. , to reduce the resistance generated when the casing guide shoe is lowered, but if the sediment accumulation in the wellbore causes the wellbore gap to be smaller than the cross-sectional area of ​​the casing guide shoe, this will still cause resistance to the lowering of the casing guide shoe, and In the process of actual operation, there are generally silt in the wellbore that hinders the lowering of the casing guide shoe. Therefore, in order to overcome this drawback, it is necessary to make further improvements to the structure of the existing casing guide shoe.

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