Rotating spray sand cleaning method

Abstract

The invention discloses rotating spray sand cleaning method, which is used for cleaning sand at the bottom of a well. The method comprises the following steps of: A, connecting a shaft sand cleaning pipe column, inserting into the well, and detecting the depth of a sand surface by using the shaft sand cleaning pipe column; B, lifting the shaft sand cleaning pipe column by 1-3 meters; C, connecting a pump to the top of the shaft sand cleaning pipe column and pumping liquid for impacting settled sand at the bottom of the well; D, making the impacted sand flow upwards in an oil thimble along with fluid, settle downwards and settle into a slotted casing; and E, putting the shaft sand cleaning pipe column down, continuously washing sand to a designed construction well depth position, and pulling the shaft sand cleaning pipe column out of the well to finish rotating spray sand cleaning operation. Due to the adoption of the method, settled sand, metal smashed blocks, stained metal blocks and corrosion inhibitor adhesives at the bottom of the well can be cleaned, a production layer is exposed, and high sand cleaning efficiency is achieved.

Description

technical field [0001] The invention relates to a sand cleaning method at the bottom of an oil well in an oil field, in particular to a rotary jet sand cleaning method. Background technique [0002] In oil and gas wells, due to fracturing stimulation, formation sand production, rust and small fragments of tubing corrosion and corrosion inhibitor cement burying the production layer, the oil and gas well cannot produce normally. To resume production, the wellbore needs to be cleaned to expose the production layer. In addition, after the oil and gas well has been in production for a period of time, the formation pressure is low. In the past, the wellbore cleaning method was generally to use a scraper drill bit or a pen-tip drill bit with a fishing cup while drilling or without a grit chamber. The success rate and operating efficiency of this operation method are relatively low. Low. [0003] Chinese patent announcement number: CN201705249U, provides another "horizontal well co...

AI Technical Summary

Problems solved by technology

In addition, after the oil and gas well has been in production for a period of time, the formation pressure is low. In the past, the wellbore cleaning method was generally to use a scraper drill bit or a pen-tip drill bit with a fishing cup while drilling or without a grit chamber. The success rate and operating efficiency of this operation method are relatively low. Low

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