Special tool for deep water test depth correction

Abstract

The invention discloses a special tool for deep water test depth correction. The tool comprises an upper airtight buckle used to connect a pup joint upper pipe string, an upper pup joint body, an integrated lifting lug, a lower thickened pup joint body, and a lower airtight buckle used to connect a pup joint lower pipe string. The upper pup joint body and the lower thickened pup joint body are of an integrated structure. The integrated lifting lug sleeves the upper pup joint body and is locked by a jackscrew. By adopting the structure, under deep-water sea conditions, a depth correction cable can be fixed to a test pipe string so as to lift and sink with the test pipe string during conventional semi-submersible platform deepwater test pipe string depth correction. Therefore, large error caused by test pipe string depth correction data is avoided, the safety of the test pipe string is ensured, and the risk and the occurrence of accidents are reduced. In addition, the tool has the advantages of simple operation, convenient maintenance, and the like.

Description

technical field [0001] The invention relates to the technical field of deep water test tools, in particular to a special tool for deep water test depth correction. Background technique [0002] When the conventional semi-submersible platform tests the depth of the pipe string, the pipe string is hung on the wear-resistant core of the underwater wellhead, and the wellhead realizes the heave compensation of the pipe string by pulling the compensation rope; for deep water testing, the pipe string When adjusting the depth of the string, because the string above the mud surface is too heavy to sit on the wellhead for anti-wear and core filling, it is necessary to carry out the depth calibration while lifting the string on the traveling block, which makes it impossible to use the conventional compensation rope to lift the string Shen compensation, the crown block and the ground pulley block can not be relatively static, so the accuracy of the school depth data cannot be confirmed....

AI Technical Summary

Problems solved by technology

[0002] When the conventional semi-submersible platform tests the depth of the pipe string, the pipe string is hung on the wear-resistant core of the underwater wellhead, and the wellhead realizes the heave compensation of the pipe string by pulling the compensation rope; for deep water testing, the pipe string When adjusting the depth of the string, because the string above the mud surface is too heavy to sit on the wellhead for anti-wear and core filling, it is necessary to carry out the depth calibration while lifting the string on the traveling block, which makes it impossible to use the conventional compensation rope to lift the string Shen compensation, the crown block and ground pulley block can not be relatively static, so the accuracy of the calibration data cannot be confirmed

There are two approaches to this problem in the world: one is to use the slips at the wellhead, and use the average value of multiple calibration data to select the depth. If this method causes a large depth error when the platform heave is large ; The second is to use the resistance display of the plug-in test string as a mark, and print the depth of the pipe string at this time to match the length of the pipe string. When , the error of the pipe string is also very large, and it also brings potential risks to the safety of the pipe string

The depth correction errors caused by the above two methods are very large. Therefore, when meeting the high-standard depth correction error, it is necessary to develop a special tool for deep water test string wellhead calibration to solve the large depth correction error of deep water test strings. The problem

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