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Apparatus and method for water well cleaning

a technology for water wells and apparatus, applied in drinking water installation, borehole/well accessories, construction, etc., can solve the problems of affecting the integrity of the water well, introducing such a large volume of water, and not being recommended or commercially used today, and achieving less time-consuming or less invasive methods.

Active Publication Date: 2012-12-13
HYDROPRESSURE CLEANING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Effectively cleans the well casing and gravel pack without disrupting the well's integrity, improving production rates and maintaining environmental quality by using high-pressure, laminar flow streams to remove scale and deposits without introducing contaminants.

Problems solved by technology

Although perhaps suitable for oil well cleaning, with respect to water well cleaning the quantity of fluid being introduced by Buell down hole is not recommended or commercially used today.
The reasoning is that introduction of such a great volume of water could potentially include unintended contaminants as well as the volume of the wash disrupting the integrity of the gravel pack.

Method used

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  • Apparatus and method for water well cleaning
  • Apparatus and method for water well cleaning
  • Apparatus and method for water well cleaning

Examples

Experimental program
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Embodiment Construction

[0047]The drawings presented are not to scale and are presented for instructional purposes.

[0048]FIG. 1 illustrates an overall view of the invention for delivery of high pressure streams of fluid into well W.

[0049]Primary tool 10 is lowered into well W down to the target depth by stainless steel coiled tubing 12 from a hydraulically driven reel 14 installed on a service vehicle 16 above surface A. Tubing 12 must be capable of withstanding a flow pressure of at least 15,000 psi. As can be best viewed in FIGS. 2 and 4, primary tool 10 is lowered to the portion of the well, which in this example is adjacent to slot perforations represented by the dashed line S, surrounded by gravel pack G.

[0050]The distal end of tubing 12 is operably connected to primary tool 10 as described later in detail. When reel 14 is used to unwind tubing 12 to lower primary tool 10 to the target depth, i.e. the lowermost portion of the well to be cleaned, which generally can be at a depth anywhere from 50 to 3,...

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PUM

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Abstract

A method and apparatus for cleaning a water well is presented. The apparatus utilizes a tool body having a plurality of discharge nozzles for jetting streams of filtered water at high pressure on to the inside wall surface of a casing across a water zone having slots or perforations. The nozzle streams are offset from the tool body imparting a rotational force. A rotary coupling is also utilized to limit the maximum rotation. The apparatus is lowered by a pre-determined length of coiled tubing to cleaning depth after which it is raised at a slow rate across the water zone.

Description

BACKGROUND OF THE INVENTION[0001]This invention relates to rehabilitation of existing water wells.[0002]Water wells are created by drilling from the surface of the earth down into a water producing zone(s). The drilled hole is cased with a suitable string of steel or PVC casing from surface down through the water zone. Typical installations can have the diameter of the casing through the water zone be from six to sixteen inches or more. The portion of the casing adjacent the water zone is typically perforated with holes or machine slots to allow water entry into the casing. After the casing has been set and depending upon the water zone strata, a clean porous zone of gravel can be pumped and set around the slotted or perforated section of the casing, also referred to as the gravel packed area, out to the lining of the well bore. The purpose of the gravel pack is to filter out the fine sediment from the surrounding formation, while allowing the water to enter into and through the per...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): E21B21/00
CPCE03B3/15E21B37/00E21B21/00E21B41/0078E21B37/08
Inventor GLASS, JEFFREY
Owner HYDROPRESSURE CLEANING