Tightening Method of Diagonal Bolts in Production Wellhead and Connecting Rod Operating Tool

Abstract

The invention discloses an oil producing wellhead diagonal bolt tightening method and a connecting rod type operation tool, and relates to the technical field of oil gas development. The method comprises the steps of enabling screw holes of two flanges matched with a wellhead to face to face, and installing bolts and nuts into the screw holes; tightening the all bolts and nuts to the preset torquethrough a turning tool with a torque meter; selecting the diagonal bolts and nuts on the flanges, and installing two wellhead spanners onto the diagonal bolts and nuts; inserting handles of the two wellhead spanners into a first support arm and a second support arm on the connecting rod type operation tool; and on the basis of ensuring the level through a level gauge, turning a force-bearing handle of the connecting rod type operation tool through a tool or manpower so as to uniformly tighten the diagonal bolts and nuts. According to the oil producing wellhead diagonal bolt tightening methodand the connecting rod type operation tool provided by the invention, the diagonal bolts of the oil producing wellhead can be tightened at the same time.

Description

technical field [0001] The invention relates to the technical field of oil and gas development, in particular to a method for tightening diagonal bolts at the head of an oil production well and a connecting rod type operating tool. Background technique [0002] Oil production wellhead is the most common oil production equipment in the field of oil field production. Generally, there are two types of connections between various parts of the oil production wellhead. The first is the clamp slip connection, and the second is the flange connection. The first type of clamp connection is to use special slips and slip screws, but because the slips only have two or four holes, the force is not balanced, so it is basically no longer used in the field. The second type of flange connection is widely used in the field, that is, the outer diameter of the flange is 380mm, and there are 12 screw holes on the upper part, with a steel ring in the middle, and M46 bolts are used to connect the t...

AI Technical Summary

Problems solved by technology

Due to the existence of flammable and explosive substances such as flammable gas, hydrogen sulfide, and crude oil at the wellhead of oil production, electric tools cannot be used in all operations, so the above installation and fastening operations are manual operations

But there are following problems in on-the-spot construction: one, the wellhead bolts are all artificially smashed tightly with a wrench and an iron hammer one by one

The above operations will cause the bolts to be unbalanced in the axial direction, that is, when the screws are tightened one by one, there will often be a problem of large gaps on one side of the steel ring, which may lead to accidents such as natural gas or crude oil leakage, and even worse. Well Control Danger

2. The bolts are not fastened diagonally together during routine operations on site. The bolts at each flange connection are completed one by one, which requires repeated operations for 12 times. One operation well requires 4 operations before repairing and after completion. connection, a total of 48 bolts, labor-intensive

3. Diagonal screws were not tightened at the same time during the on-site construction. On the surface, it seems that the force is balanced. In fact, the flange after the completion of the well is likely to be biased at one end, but it cannot be accurately judged by the naked eye on site.

Images