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Irregular shaft cleaning and drifting device based on deflection angle flow dividing and drifting method

An irregular, well-passing technology, used in cleaning equipment, wellbore/well components, earth-moving drilling and other directions, can solve the problems of obstruction during tripping, low wellbore cleanliness, etc., and achieve improved and reduced cleanliness. The effect of a collapse accident

Pending Publication Date: 2021-01-29
CHINA PETROCHEMICAL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1. Irregular wellbore cuttings deposits in deep wells, it is difficult to carry the cuttings attached to the belly hole and candied haws hole to the wellhead through conventional circulation, and the cleanliness of the wellbore is not high
[0007] 2. The phenomenon of virtual thick mud cake in deep wells leads to obstruction in tripping

Method used

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  • Irregular shaft cleaning and drifting device based on deflection angle flow dividing and drifting method
  • Irregular shaft cleaning and drifting device based on deflection angle flow dividing and drifting method
  • Irregular shaft cleaning and drifting device based on deflection angle flow dividing and drifting method

Examples

Experimental program
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Effect test

Embodiment

[0028] (1) WY29-4HF well

[0029] 1) Borehole size: φ311.2mm

[0030] 2) The reason for the irregular well section: 764-986m, the air drilling process was used, and then it was converted to the conventional drilling fluid process. The hole expansion rate caused by the air drilling process was 10% higher than that of the conventional drilling fluid, so a pot belly occurred in this well section borehole. Drilling cuttings accumulate in the belly section, making it difficult to circulate out of the wellbore, which may easily cause downhole complications.

[0031] 3) Well drilling tool assembly: φ311.2mm cone bit + back pressure valve + 1 piece of 203.2mm helical drill collar + well body + 5 pieces of 203.2mm helical drill collar + 15 pieces of 139.7mm heavy drill pipe + 139.7mm drill pole.

[0032] 4) Drilling process: Drill down to the depth of the well, adopt the method of active reaming to the depth of 986m, and circulate the cuttings.

[0033] 5) Condition of the wellbore...

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Abstract

The invention relates to an irregular shaft cleaning and drifting device based on deflection angle flow dividing and a drifting method. The irregular shaft cleaning and drifting device comprises a female connector, a drainage groove, a drifting body, scraping teeth, drifting strips, deflection angle flow dividing holes and a male connector. The female connector is connected with a drill bit, the male connector is connected with a drill rod, the scraping teeth are welded to the drifting strips, the drifting strips are welded to the drifting body, the deflection angle flow dividing holes are holes formed in the drifting strips, the holes penetrate through the drifting body all the time and communicate with a water hole of the drifting body, and the drainage groove is formed in a gap betweenthe two drifting strips. The irregular shaft cleaning and drifting device has the advantages of being suitable for deposition of rock debris in irregular boreholes in a deep well drifting process, capable of enabling the rock debris to be more easily carried to a wellhead in a circulating mode, reducing well wall collapse accidents and trimming the well wall, the borehole cleanliness can be improved, and the irregular shaft cleaning and drifting device is suitable for being widely used.

Description

technical field [0001] The invention relates to the field of drilling technology, in particular to a well cleaning device and a well drilling method for irregular wellbores based on deflection jet flow. Background technique [0002] Well drilling is to use the drill pipe to carry a tool with a certain diameter, or directly use the drill pipe to advance in the wellbore, and the wellbore treatment is more regular, so as to provide a good passage environment for subsequent construction such as casing or logging. After logging, before running the casing, when conventional drilling tools run into obstacles and cannot be dealt with, lost circulation and other complexities cannot continue drilling, different drilling tool structures are selected according to the downhole conditions during well drilling. For ordinary vertical wells, the downhole is normal, and the well needs to be passed after logging or before casing running. Roller bit, drill collar, well passer, and drill pipe ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B37/00E21B37/02
CPCE21B37/00E21B37/02
Inventor 沈建文睢圣杜征鸿李林黄胜强罗朝东王兴忠陈虹霓王方博刘丹洁李衡罗翰陈仕仪王大勇王存新
Owner CHINA PETROCHEMICAL CORP
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