Water

HYDROGEOLOGICAL EXPLORATIONS FOR GROUND WATER

BULGARGEOMIN is specializing in the following activities relating to the exploration, evaluation and development of ground water in countries of various geological conditions.

Hydrogeological mapping of specific regions of water reservoirs, including:

  • Investigations and evaluation of all geological and hydrogeological data available;
  • Mapping of areas in appropriate scale for determination of the different water-bearing and water-impermeable horizons, their lithology and stratigraphy;
  • Plotting on the map of all water sources, springs, wells and boreholes, and their inventory, including the specific hydrogeological data;
  • Periodical measurements of the springs, their yield and temperatures, wells and boreholes water tables and production wells yields;
  • Regular measurements of the springs, their yield and temperatures, wells and boreholes water tables and production wells yields;
  • Periodical measurements of precipitation, rivers and wadis level;
  • Periodical water sampling for chemical and biochemical analyses;
  • Drawing-up of hydrogeological maps, including maps for chemical composition of underground waters, depth maps – from surface to ground water level, maps of water capacities in specific areas, locations recommendations for exploratory-production wells drilling sites, preliminary evaluation of production reserves of regions and basins under survey;

Execution of surface geophysical surveys including el. profiling, vertical el. sounding, for determining the hydrogeological structure of specific areas

Drilling of hydrogeological exploratory, production and observation wells of different diameters, and of 100 – 2000 m depths

  • The drilling is performed by the rotary method, generally with drilling mud, under strict observation of its parameters. Air/foam drilling is carried out if required.
  • Cuttings are taken for lithological studies at two meters intervals.
  • On Employer’s request, drilling is performed on some intervals by double core barrels, for the determination of the lithological composition, porosity, and the age of the strata penetrated.

Conducting of well logging in completed hydrogeological well, before cased, including:

  • el. resistivity 16”, 64”;
  • normal el. potential - SP;
  • normal gamma-ray
  • temperature - T
  • calliper log
  • mud resistivity
  • Compensated Density Log for deeper wells on Employer’s request.

Well Casing

Generally the wells are cased by API casing of carbon steel and by Stainless Steel casing and screens in aggressive waters. Cementing is made by special cementing units.

Rod base, wire wrapped, continuous slot screens and bridge slotted screens of different diameters are generally used, depending on the water-bearing formations penetrated. Gravel pack is used, if necessary, of rounded quartz grains of appropriate size.

On Employer’s request, for reduction of the casing programme costs the holes can be equipped with casing of rolled welded steel sheets and the screens can be of slotted or perforated pipes.

Well Development

The methods applied are as follows: washing with clean water, jetting, treatment with hexametaphosphate or acid (in presence of carbonate rocks), bailing, surging, air-lifting, and pumping by submersible pumps.

Pumping Tests

These tests are usually performed by submersible pumps of appropriate characteristics (yield, water head and diameter), according to the specific requirements.

Measurements of Water Table Variations

Usually this measurement of the observation wells (piezometric) is carried out by automatic recording.

Determination of Hydrogeological Parameters

These are determined by the latest up-to-date methods, in accordance with the world practices applied.

A mathematical model is prepared with all necessary parameters after a comprehensive survey of certain regions of reservoirs, on the basis of the data collected from the exploratory-production and piezometric wells, and of all located water sources, and an appropriate algorythm for computer processing is selected for determining the balance of ground waters and water resources production for a certain period.

The mathematical model is worked out by renown scientists of the Bulgarian Academy of Science and Sofia University of Mining and Geology and by hydrogeologists and mathematicians of various institutes.

Working out of Final Hydrogeological Report.

On the basis of all data obtained in the process of the comprehensive study, as well as the data interpretation, a Final Hydrogeological Report is prepared with conclusions and recommendations for the future exploitation of underground waters in the areas under survey or in the water-collecting regions.

EXECUTED PROJECTS

Hydrogeological surveys in Libya – Tripolitania and Fezzan regions with construction and completion of more then a 1000 water wells under 8 separate contracts consisting of more than 450 000 linear meters for development of desert land for the Secretariat of Agrarian Reform and Land Development, delivering 5.5 million cubic meters of water per day.

Drilling of 127 production and exploratory water wells in Algeria, mainly in the Wilaya Tlemsen, Saida, Mascara, M’Sila, Anaba for the Ministere de Hydraulique, and in the oil-gas bearing regions Hassi R’Mel, Hassi Messaud and others for the National Oil Company;

Drilling of water wells in the area of Azraq – Jordan for water supply of Amman. The Employer for this project was the Amman Department for Water Supply and Sewerage.

Drilling of 2 exploratory & production water wells for National Water and Sanitation Authority - Yemen.

Executed a number of water supply projects in different regions of Morocco .

PERFORMANCE RECORD OF BULGARGEOMIN LTD.

DETAILS OF THE WATER WELLS SUCCESSFULLY DRILLED AND COMPLETED BY THE COMPANY

Name of Project and Location

Name of Client

Type and Casing Program

Nos.

Type

Size
 [inch]

Depth
[m]

1

2

3

4

5

6

LIBYA

 

 

 

 

 

Nalut

Nalut Municipality

5

Production

13 3/8

300

Wadi Hira

Wadi Hira Project

28

Production

13 3/8

300-500

Bir Tarfas

Zavia Municipality

42

Production

13 3/8-8 5/8

300-600

Nalut

Nalut Municipality

14

Production

10 5/8

250-400

Sirt I

Water and Soil Dept.

12

Exploration

13 3/8-9 5/8-6 5/8

1500

Sirt I

Water and Soil Dept.

7

Production

13 3/8-9 5/8-6 5/8

1000

Disa Hatia

Ubary Municipality

84

Production

13 3/8-8 5/8

350

Mardum - Sufaljin

Solul EI Hoder Authority

17

Production

13 3/8-9 5/8-6 5/8

1200

EI Shumar

EI March Municipality

4

Production

13 3/8

450

Barjush-Irawan

Secretariat of Agrarian Reform & Land Development

9

Exploration

13 3/8-9 5/8-6 5/8

350-800

Wadi Hira

Water and Soil Dept.

12

Production

13 3/8

310

Haraba

Water and Soil Dept.

2

Production

13 3/8-6 5/8

520

Tawargha

Water and Soil Dept.

1

Exploration

13 3/8-9 5/8-6 5/8

2200

Dafinia

Water and Soil Dept.

4

Exploration

13 3/8

400

Tawargha

Water and Soil Dept.

2

Exploration

13 3/8

603

Wadan

Water and Soil Dept.

3

Exploration

13 3/8-9 5/8-6 5/8

1600

Shuwaref

Solul EI Hoder Authority

12

Production

13 3/8-9 5/8-6 5/8

650-110

Beni Walid

Solul EI Hoder
Authority

4

Production

13 3/8

400

Wadi EI Hai

Water and Soil Dept.

8

Production

10 3/4-8 5/8

300

Wadi Colub

Water and Soil Dept.

2

Production

13 3/8-9 5/8-6 5/8

1500

Zam- Zam

Solul EI Hoder Authority

6

Production

13 3/8-9 5/8-6 5/8

1200

Suk EI Hamiz

Secretariat of Light Industry

1

Production

13 3/8-9 5/8-6 5/8

1035

Buariat EI Hasun

Water and Soil Dept.

1

Exploration

13 3/8-9 5/8-6 5/8

1550

Kershana

Solul EI Hoder Authority

3

Exploration

13 3/8-9 5/8-6 5/8

1600

Sokna

Hun Municipality

4

Exploration

13 3/8-6 5/8

240-350

Barjush- Iravan

Secretariat of Agrarian Reform & Land Development

113

Production

13 3/8-8 5/8

350

Wadi Shatti

Brak Municipality

18

Production

10 3/4

210

Ubari

Ubari Project

9

Production

13 3/8-6 5/8

400

Gatrun

Gatrun Municipality

4

Exploration

13 3/8-9 5/8-6 5/8

750

Magnusa

Secretariat of Agrarian Reform & Land Development

30

Production

13 3/8-8 5/8

350

Tripolitania

Secretariat of Agrarian Reform & Land Development

6

Production

16 3/8-9 5/8-6 5/8

1210

Tishna

Secretariat of Agrarian Reform & Land Development

1

Production

13 3/8-9 5/8-7-4 1/2

2221

Garian

Secretariat of Agrarian Reform & Land Development

5

Production

13 3/8-6 5/8

600

Tripolitania- Fezzan

Secretariat of
Agrarian Reform & Land Development

164

 

Exploration

 

13 3/8-9 5/8-6 5/8

 

350-1740

W. Mardum

Ministry of Agriculture

2

Production

13 3/8-9 5/8-6 5/8

1200

Ras AI Tabl

Ministry of Agriculture

1

Production

13 3/8-9 5/8-6 5/8

1350

Bay AI Kabir

Ministry of Agriculture

2

Production

13 3/8-9 5/8-6 5/8

1300-1500

Wadi Nina

Ministry of Agriculture

2

Production

13 3/8-9 5/8-6 5/8

800-1200

W. Zam Zam

Ministry of Agriculture

4

Production

13 3/8-9 5/8-6 5/8

1100-1300

Yefren Gado

Ministry of Agriculture

6

Production

13 3/8-9 5/8-6 5/8

400-700

W. Maymun

Ministry of Agriculture

7

Production

13 3/8-9 5/8-6 5/8

400-700

Hun

Ministry of Agriculture

5

Production

13 3/8-9 5/8-6 5/8

600

N.Fezzan

Ministry of Agriculture

14

Production

13 3/8-9 5/8-6 5/8

450-1000

Sadada

Ministry of Agriculture

3

Production

13 3/8-9 5/8-6 5/8

1100-1300

Nemua

Ministry of Agriculture

1

Production

13 3/8-9 5/8-6 5/8

1159

Sokna

Ministry of
Agriculture

7

Production

13 3/8

250

Swayya

 

Ministry of Agriculture

1

Production

13 3/8-9 5/8-6 5/8

1740

Beni Walid

Municipality of Beni Walid

7

Production

13 3/8-9 5/8-6 5/8

1200

Wadi Shatti

General Org. for Agricultural Production

28

Production

13 3/8

400

Gudua

General Org. for Agricultural Production

18

Production

13 3/8

350-400

Tripolitania - Fezzan

General Org. for Agricultural Production

71

Exploration & Production

13 3/8-9 5/8-6 5/8

300-1500

Ubari Road

General Org. for Agricultural Production

2

Production

13 3/8

150-180

Azumi

General Org. for Agricultural Production

1

Production

13 3/8-9 5/8-6 5/8

1350

Namrunia

General Org. for Agricultural Production

3

Production

13 3/8

300

Tineay

General Org. for Agricultural Production

1

Production

13 3/8-9 5/8-6 5/8

1063

Bir Marahnn

General Org. for Agricultural Production

1

Production

13 3/8

77

Abu Mjayim

General Org. for Agricultural Production

1

Production

13 3/8-9 5/8-6 5/8

1400

Sebha

General Org. for Agricultural Production

5

Production

13 3/8

150-170

Galib

General Org. for Agricultural Production

1

Production

13 3/8-9 5/8

750

Wadi Shargi

General Org. for Agricultural Production

1

Production

13 3/8-9 5/8-6 5/8

1300

Qarai AI Jana

General Org. for Agricultural Production

1

Production

13 3/8-9 5/8

600

Wadi Shargi

General Org. for Agricultural Production

1

Production

13 3/8

427

Bei Kebir

General Org. for Agricultural Production

1

Production

13 3/8-9 5/8-6 5/8

1300

Feat Ghat

General Org. for Agricultural Prod.

3

Production

13 3/8

400

Askeda

General Org. for Agricultural Production

3

Production

13 3/8-9 5/8

400-500

Derj

General Org. for Agricultural Production

1

Production

13 3/8-9 5/8-6 5/8

860

Dirghis

General Org. for Agricultural Production

1

Production

13 3/8-9 5/8-6 5/8

1387

Gerah       

General Org. for Agricultural Production

4

Production

13 3/8

300

Jdayda

Tripoli Municipality

2

Production

13 3/8

110

Suany Road

Tripoli Municipality

1

Production

13 3/8

206

Wadi Gaam

Tripoli Municipality

1

Production

13 3/8

283

Ain Zahra

Tripoli Municipality

2

Production

13 3/8

120

Zigen

Tripoli Municipality

2

Production

13 3/8-9 5/8-6 5/8

700-1150

Ben Gashir

Tripoli Municipality

1

Production

13 3/8

300

Ain Zahra

Tripoli Municipality

2

Production

13 3/8-9 5/8

50-500

Abu Slim

Tripoli Municipality

1

Production

13 3/8-9 5/8

600

Sidi Sayah

Tripoli Municipality

1

Production

13 3/8

294

Sadada

Tripoli Municipality

1

Production

13 3/8

400

Homs

Tripoli Municipality

2

Production

13 3/8

100-300

Garhabuli

Tripoli Municipality

8

Production

13 3/8

100-339

Tajura

Tripoli Municipality

2

Production

13 3/8

98

Qulub

Tripoli Municipality

2

Production

13 3/8-9 5/8-6 5/8

1300-1500

Hay EI Wahda

Tripoli Municipality

2

Production

13 3/8

45-54

Gurdgy

Tripoli Municipality

2

Production

13 3/8

56

Beni Walid

Tripoli Municipality

3

Production

13 3/8-9 5/8-6 5/8

700-1050

Shumaukh

Tripoli Municipality

1

Production

13 3/8-9 5/8-6 5/8

1050

Wadi Zarat

Tripoli Municipality

1

Production

13 3/8

100

Zoaia

Tripoli Municipality

1

Production

13 3/8

288

Garaia

Tripoli Municipality

1

Production

13 3/8

283

Regeba - 1

Tripoli Municipality

1

Production

13 3/8

248

Guerat

Tripoli Municipality

1

Production

13 3/8

288

Regeba - 2

Tripoli Municipality

1

Production

13 3/8

280

Ubari Dissa

Tripoli Municipality

1

Production

13 3/8

257

Brek

Tripoli Municipality

1

Production

13 3/8

251

Ejej

Tripoli Municipality

1

Production

13 3/8

290

Wadi Tmaslah

Tripoli Municipality

1

Production

13 3/8-9 5/8-6 5/8

1140

Kabaw

Tripoli Municipality

1

Production

13 3/8-9 5/8

500

Tarhuna Harda

Tripoli Municipality

1

Production

13 3/8

260

Ghat

Tripoli Municipality

2

Production

13 3/8

400

Suani

Tripoli Municipality

17

Production

13 3/8

60-160

Tarhuna Etep

Tripoli Municipality

1

Production

13 3/8-9 5/8

500

Bengashir

Tripoli Municipality

1

Production

13 3/8

160

Homs

Tripoli Municipality

1

Production

13 3/8

200

Berket Ghat

Tripoli Municipality

1

Production

13 3/8

460

Majilla

Tripoli Municipality

1

Production

13 3/8

180

Suk AI Hamiz

Tripoli Municipality

1

Production

13 3/8

260

Zanzur

Tripoli Municipality

4

Production

13 3/8

80-160

Manshura

Beni Walid Municip.

3

Production

13 3/8-9 5/8

400-650

Beni Walid

Tripoli Municipality

2

Production

13 3/8-9 5/8-6 5/8

973

EI Halfawi

Beni Walid Municip.

1

Production

13 3/8-9 5/8

650

Bir EI Ghahem

Tripoli Municipality

1

Production

13 3/8

300

Tajura

Tripoli Municipality

1

Production

13 3/8-9 5/8

630

Wadi Shargi

Tripoli Municipality

1

Production

13 3/8

352

Tarhuna

Armed Forces

1

Production

13 3/8-9 5/8

550

Zliten

Armed Forces

1

Production

13 3/8

430

Beni Walid

Municipality of Beni Walid

5

Production

10 3/4-6 5/8

450

Jufra

ODAC

1

Production

13 3/8-9 5/8-6 5/8

1640

Jufra

ODAC

1

Production

13 3/8-9 5/8-6 5/8

1600

 

 

 

 

 

 

AlGERIA

 

 

 

 

 

Hassi R”Mel

Sonatrach

30

Production

13 3/8

400-500

Hassi Saida

Sonatrach

15

Production

13 3/8

300

Villaya Saida

Hydraulic city of Saida

12

Production

13 3/8

300

Villaya Tizi Ouzo

Hydraulic city of Tizi Ouzo

40

Production

13 3/8

100-200

Villaya Tlemsen

Hydraulic city of Tlemsen

10

Production

13 3/8

200-300

Villaya Saida

Hydraulic city of Saida

20

Expl.&Prod.

13 3/8

150-450

 

 

 

 

 

 

JORDAN

 

 

 

 

 

Arzak

Ammon Water and Sewerage Authority

24

Production

13 3/8

200

Shidiya

NRA

24

Exploration

14-8 5/8

200-500

Jordan Valley

Jordan Valley Authority

8

Exploration

20-13 3/8-9 5/8-7

1850

 

 

 

 

 

 

YEMEN

 

 

 

 

 

Sawas - 3

NWSA

2

Exploration

20-13 3/8-9 5/8-7

1850



CLIENT REFERENCES: