Fishing bottom plug and fishing tool combination for expansion pipe

Abstract

The invention relates to assorted devices and fishing tools for expansion pipes for repairing adhesion on oil and water wells, and discloses a fishing bottom plug and fishing tool combination for an expansion pipe. The fishing bottom plug and fishing tool combination comprises a fishing bottom plug and a fishing tool. A main body of the fishing bottom plug and fishing tool combination is a dowel bushing, a T-shaped groove is formed in the dowel bushing, a head of a dowel is clamped in the groove, and the dowel can be horizontally extended or retracted when sliding up and down along the T-shaped groove, so that the fishing bottom plug can be inserted into the expansion pipe or can be separated from the expansion pipe. The fishing bottom plug and fishing tool combination has the advantages that the bottom of the expansion pipe is sealed by the fishing bottom plug, and a high-pressure zone can be established below an expansion head in the expansion pipe by liquid which is pumped into the expansion pipe, so that the expansion head can be pushed to move, and expansion construction on the expansion pipe can be completed; the special fishing tool can be tripped into the fishing bottom plug after expansion construction is completed, a draw bar of the fishing bottom plug can be clamped by a sectioned locking claw of the special fishing tool, and the integral bottom plug can be fished out; partial components of the expansion pipe can be fished out by the special fishing tool when the integral bottom plug cannot be fished out, so that remaining portions of the bottom plug can be milled conveniently.

Description

technical field [0001] The invention relates to an expansion pipe matching device and a fishing tool for subsidizing oil and water wells, in particular to a fishing bottom plug and fishing tool. Background technique [0002] At present, the bottom-up expansion process is mostly used in the subsidy construction of the expansion tube. In order to enable the expansion tube to start expanding at the set position and reduce the hook load during the expansion process, it is necessary to install a bottom plug at the lower end of the expansion tube to make the expansion tube A firing chamber is formed between the head and the bottom plug. When the expansion tube expands, liquid is pumped into the firing chamber, and the pressure of the liquid pushes the expansion head to move upward to realize the radial expansion of the expansion tube. After the expansion construction is completed, the bottom plug is removed. remove. The removal of the bottom plug of the launch chamber is mainly d...

AI Technical Summary

Problems solved by technology

For the positioning in the form of a card slot, due to the limitation of the wall thickness of the expansion tube, the depth of the annular groove cannot be too deep. When the liquid pressure in the expansion tube is too high, the expansion tube will expand at the bottom plug position, which may cause the valve to split. The claws come out of the annular groove of the expansion tube, resulting in the failure of the seal of the bottom plug that can be pulled out or the bottom plug falls off, so that the construction of the expansion tube cannot be completed smoothly

For the positioning in the form of slips, the same problem will occur in the bottom plug due to the expansion of the expansion tube at the bottom plug position

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