Automatic grouting float collar and float shoe

Abstract

The invention discloses an automatic grouting float collar and float shoe. Casing pipe threads are machined at the upper and lower ends of a float collar body (1) or the upper end of a float shoe body (1) and connected with petroleum casing pipes, a guiding cap is installed at the lower end of the float shoe body (1), a stop valve seat (2) is connected to the inner wall of the body (1) through a straight thread, an inclined surface is machined at an inner hole of the stop valve seat (2) as a sealing surface, a stop valve (3) is installed below the stop valve seat (2), the sealing face of a valve body is a spherical surface, a shearing mechanism (4) and a flow control valve (6) are fixedly connected to the portion, on the inner wall of the body (1), below the stop valve seat (2) through high-strength concrete (7) in a sealed mode, the flow control valve (6) is located below the shearing mechanism (4), and an alloy ball (5) is thrown into the shearing mechanism (4). In drilling operation, automatic grouting and automatic flow-limiting designing are performed, in this way, it is effectively avoided that in the process of lowering the casing pipes, surging pressure causes lost circulation, and the product is good in drillability, resistant to corrosion and good in well-cementation quality.

Description

technical field [0001] The invention relates to a floating hoop and a floating shoe, in particular to an automatic grouting floating hoop and a floating shoe used in oil and natural gas drilling. Background technique [0002] As important casing accessories, floating hoops and floating shoes directly affect the quality of cementing. At present, the existing floating hoops and floating shoes are mainly composed of a body, a flow limiting plate, a stop valve seat, an alloy ball, a flow control valve, and a guide cap. The product structure has the following disadvantages: [0003] 1. Unable to automatically grout: Due to structural reasons, the floating ball must be put into the body when leaving the factory. When the casing is lowered, the mud pressure will make the floating ball rise and block the stop valve seat hole in advance, resulting in an imbalance in the pressure of the inner and outer casings. Casing operation must be stopped during grouting, resulting in prolonged ...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the shortcomings of the existing floating hoops and floating shoes that cannot be automatically grouted, the pressure is not easy to control when running the casing, the drillability and sealing performance are poor, the production efficiency is low, and the products are easily corroded when exposed to acidic environments, making the product invalid. The invention provides a Floating hoop, automatic grouting, automatic current limiting, good sealing and drillability, high temperature resistance, corrosion resistance, reducing drilling time

Images