Sand-flushing and well-dredging method

Abstract

The invention provides a sand-flushing and well-dredging method, which is carried out by adopting a sand-flushing and well-dredging device, and the sand-flushing and well-dredging method comprises thefollowing steps of: 10, putting a sand-flushing and well-dredging device into a set position in a well and carrying out sand detection operation; 20, connecting the sand-washing and well-dredging device with a cement tank car for sand flushing operation, and lifting the sand-washing and well-dredging device to an upper boundary set position of an oil layer after the sand flushing is finished; 30,throwing balls into a central pipe to pressurize, wherein a pressing driving component can drive a frustum body to taper into a reducing sleeve and increase the diameter of the reducing sleeve; 40, lowering a detection pipe column to an artificial well bottom, and detecting the casing condition between the artificial well bottom and the upper boundary of the oil layer; 50, after the detection isfinished, lifting the sand-washing and well-dredging device, when the lifting is blocked, increasing the lifting pulling force to reset the frustum body, so that the diameter of the reducing sleeve isrestored, and lifting the sand-washing and well-dredging device to the ground at the moment. According to the invention, the sand-flushing and well-dredging process can be completed by carrying out one-time pipe column lifting operation, so that the labor intensity of workers can be reduced, and the production time is improved.

Description

technical field [0001] The invention relates to the field of prevention for oil drilling, in particular to a sand flushing well drilling method. Background technique [0002] At present, when workover operations in oilfields such as: thermal recovery, water plugging, layer repair, fracturing and sand control, hydraulic fracturing, etc., sand washing and well drilling are indispensable construction procedures, and sand washing, The tripping and lowering operation of the two trips of the pipe string in the well. Especially for ultra-deep well operations, the number of tubing tripped in two steps of sand washing and drilling is astonishing. For example, in a deep well with a depth of about 5000m, at least 2400 tubings are lifted and lowered in two steps of sand washing and drilling, which affects the production timeliness and increases the workload of workers. workload and labor intensity. Contents of the invention [0003] The invention provides a sand flushing and well dr...

AI Technical Summary

Problems solved by technology

Especially for ultra-deep well operations, the number of tubing tripped in two steps of sand washing and drilling is astonishing. For example, in a deep well with a depth of about 5000m, at least 2400 tubings are lifted and lowered in two steps of sand washing and drilling, which affects the production timeliness and increases the workload of workers. Workload and Labor Intensity

Images