FISD Drilling is a member of the FISD Group of Companies Limited Company. It is the leading borehole drilling contractor in Malawi. Established in 2011, FISD drilling owns four state of the art PRD drilling rigs and compressors that can drill up to a depth of 800m, making FISD Drilling the only Malawian contractor that can drill the deepest.Having been in existence for eight years, we have extensive knowledge in the field of borehole drilling and understand requirements of specific customers as well as projects. The company has been involved in a number of projects involving evaluation, baseline studies, feasibility studies, environmental impact assessment, project design and proposal development, community need assessment etc. Currently the company employs five drillers and two technical assistants on each rig with over ten years combined experience in drilling and maintenance of the machines. The Company has a total of 17 employees, who form part of the drilling crew in their respective units. For pump and recovery tests, the company has 12 pumps for use on site, including the necessary equipment to lower and lift submersible pumps.
After the contract has been formalized, our technical team will visit the site along with geologists to identify the best place to carry out the drilling process.
The drilling rig accompanied by a support truck will reach the site. Based on the soil and rock formation conditions, we would take approximately 3 hours to prepare for the drilling process.
The drilling is carried out by using the “Down-The-Hole” technology. This system works by using high compressed air built within our drilling rig. The size of the hole can vary depending on the requirement of the client. As the drilling process continuous, geological rock samples are taken at 2 meter intervals. Struck and water rest levels are constantly recorded. This process enables us to estimate the yield of individual aquifers encountered.
Once the borehole has been drilled, it must be lined with either steel or UPVC casing. The casing process keeps the well open and protects the earth, similar to the efforts to protect groundwater. The hard metal casing shores up the wellbore and extends through both the verticality and the horizontal drilling phases, assuring the long-term integrity of the well from end-to-end. In addition to providing stabilization and keeping the sides of the well from caving in on themselves, casing protects the well stream.
Once the screen, pack, seals and backfill have been installed, the well is developed. This development aims at repairing the damage done to the aquifer during the course of drilling by removing clays and other additives from the borehole. This also alters the physical characteristics of aquifer around the screen and removes fine particles. The use of over pumping as a means of development is not advocated since it only increases permeability in zones which are already permeable. Instead, we recommend mechanical surging with a plunger or the use of air or water jetting which physically agitates the gravel pack and adjacent aquifer material. This is an extremely efficient method of developing and cleaning wells.
After development and preliminary tests, a long-duration well test is carried out. Well tests have to be carried out on all newly-completed wells, because not only does this give an indication of the success of the drilling, design and development, but it also yields formation on aquifer parameters which are vital to the hydro geologist.
A well test consists of pumping a well from a measured static water level (SWL) at a known or measured yield, and recording the rate and pattern by which the water level within the well changes. Once a dynamic water level (DWL) is reached, rate of inflow to the well equals the rate of pumping. Today, it is a common practice to carry out a ‘step drawdown test’, in which the yield is increased stepwise. Each step is continued until hydraulic equilibrium is reached after which the yield is increased with 50 to 100%.Towards the end of the test a water sample of 2 liters is collected for chemical analysis. The duration of the test is 24 hours, with a further 8 hours for a recovery test (during which the rate of recovery to SWL I recorded). The results of the test enables the hydro geologist to calculate the best pumping rate, the installation depth, and the drawdown for a given discharge rate.
Water Quality Test
FISD Drilling has contracted well trained chemists that conduct water quality tests in the quest of knowing the status of total coliform bacteria, nitrates, total dissolved solids and pH levels. Where a client suspects other contaminants, FISD drilling also tests for such.
Motorized Pump Installation
Depending on the well testing report, FISD Drilling installs motorized submersible pumps through its sister company; FISD irrigation and Energy Services which specializes in pumps.
Water for People
Southern Region Water Board
Feed the Children
Central region Water Board
Land O’ Lakes
National Bank of Malawi
Total Land Care
Famers Union of Malawi