W 119 Technical Rule - Standard 12/2002 -PDF file-

Development of Wells by Desanding ? Requirements, Methods, Residual Sand Contents

59,59 €*
  • DVGW
  • 29 pages
  • available as PDF only
  • 2nd edition 2002
  • 1
  • 1
  • 510401

59,59 €*

This Technical Standard W 119 serves as basis for the development of wells by desanding. Sand contents arising during well operation can have a disruptive effect. The consequences can for instance be sanding up of the well, destruction of the submersible motor pumps or disruptions in water treatment. In addition, longlastingsand production of a well may lead to soil settlements, which in turn can have a negative Impact on the entire construction.

The technical standard defines criteria for assessing the sand content of raw water and provides guide values for a (still to be approved) residual sand content during the development and operation of wells. The requirement of sandfree water (technical absence of sand) raised in DIN 18302 will in particular be explained in more detail.

In addition, experts at water utilities, drilling and well construction companies, engineering offices, pertinent authorities and scientific institutions in charge of planning and construction work are provided with aids for the development of wells by desanding.

1 Scope

2 Normative references

3 Definitions, abbreviations

3.1 Development

3.2 Desanding

3.3 Intensive desanding

3.4 Solids content

3.5 Sand content during desanding

3.6 Residual sand content

3.7 Colmation (Clogging)

3.8 Mammoth pump principle

3.9 Abbreviations

4 Well purging and removal of silt accumulations

4.1 Well purging

4.2 Removal of silt accumulations

5 Functions of development by desanding

6 Desanding ability / desanding risks

7 Desanding methods

7.1 General

7.2 Continuous methods

7.2.1 Swabbing

7.2.2 Intermittent pump out (shocking)

7.3 Section-by-section methods

7.3.1 Intensive desanding Sealed submersible motor pump Desanding strainer

7.3.2 High-pressure water (pressure wave/impulse method acc. to DVGW Technical Standard W 130)

7.3.3 Swabbing with simultaneous pumping out

8 Characteristics in consolidated rock

8.1 General

8.2 Developing during drilling operations

8.3 Developing an open well bore

8.4 Developing a well already equipped with casing and gravel

9 the sand content and residual sand content

9.1 General

9.2 Measuring methods

9.2.1 Wet measurement

9.2.2 Dry measurement

9.3 Measurement methods

9.3.1 Buckets

9.3.2 Sand measuring tank

9.3.3 Sand measuring instrument

9.4 Criteria for discontinuing desanding

9.5 performance acceptance tests

9.5.1 Measurements at acceptance of well structure

9.5.2 Measurements during operation

10 Documentation

11 Absence of sand/residual sand content


13 to reduce the sand content

13.1 Assessment of sand production

13.2 Measures

14 Details of contract specification

15 Contract award

Annex A (informative)

Annex B (informative)

Annex C (informative)

Annex D (informative)