Infrastructure, Networks & Equipment
Well Rehabilitation Companies
Well rehab specialists restoring yield through brushing, acidizing, surging, and screen replacement.
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Water Well Rehabilitation: Pump Testing, Chemical Treatment, and Redevelopment Methods
Water well rehabilitation restores declining yield, deteriorating water quality, or mechanical failures in boreholes and wells that serve as drinking water sources, industrial water supplies, or irrigation systems. Well performance declines due to: biofouling (iron-oxidising bacteria, Gallionella, Leptothrix, Sphaerotilus forming ochre deposits; sulphate-reducing bacteria, Desulfovibrio, producing H2S and corrosion); chemical incrustation (calcium carbonate, iron hydroxide, manganese dioxide, silica deposits on screen, gravel pack, and formation); physical clogging (fine sand, silt migration into gravel pack); pump wear and mechanical deterioration; casing corrosion (steel casing, EN ISO 14688-2 gravel pack requirements). Diagnostic assessment before rehabilitation: (1) Pumping test at multiple rates (step test or constant rate test per BS EN ISO 14686:2003) to determine current specific capacity (m3/h/m drawdown) vs original commissioning test; (2) CCTV downhole survey (mini-pan-tilt-zoom camera, 50 to 300 m depth, SD to 4K resolution) to identify incrustation, perforations, casing damage; (3) Flowmeter profiling (impeller or electromagnetic inflow meter lowered on cable) to identify productive zones and blocked sections; (4) Water quality sampling (physical, chemical, microbiological) to guide rehabilitation approach.
Chemical rehabilitation methods dissolve and mobilise incrustations and biofouling from well screens and formation: acid treatment (hydrochloric acid, HCl, 10 to 15 percent solution; citric acid for carbonate scales; sulphamic acid for mixed iron-carbonate deposits) - acid reacts with calcium carbonate (CaCO3 + 2HCl yields CaCl2 + H2O + CO2) and iron hydroxide (Fe(OH)3 + 3HCl yields FeCl3 + 3H2O); acid inhibitor (phosphonate-based) is added to prevent casing corrosion during treatment; acid volume calculated to treat the screened zone (typically 50 to 200 L per metre of screen); contact time 4 to 12 hours; neutralisation and pumping to waste before returning to service. Biocide treatment: chlorination (sodium hypochlorite 50 to 500 mg/L Cl2, contact 4 to 24 hours) or hydrogen peroxide (3 to 12 percent H2O2) for iron-oxidising bacteria control; biocide applied before acid treatment to kill bacteria and de-encase ochre; dispersant (EDTA, citric acid, or proprietary dispersant) added to mobilise ochre cake. Sequenced chemical treatment: biocide + dispersant (4 to 12 hours) then acid (4 to 12 hours) then airlift pumping to remove mobilised deposits; repeat 2 to 3 cycles for heavily fouled wells. UK EA abstraction licence conditions may restrict discharge of acidic or highly chlorinated water during well rehabilitation - permit conditions must be checked before treatment.
Physical rehabilitation methods surge and redevelop the well to restore gravel pack and formation permeability. Surging (surge block or compressor): a surge block (plunger fitted to drill string, slightly smaller than casing) is moved rapidly up and down, creating pressure surges that drive water in and out of the screen and gravel pack, dislodging loosened incrustation and fine particles; compressor surging (air injection below screen) creates high-velocity upflow that removes fine material; high-pressure jetting (10 to 70 MPa water jet from rotating jetting tool lowered on drill string): directly impacts screen and incrustation with high-velocity water, breaking and removing deposits. Borehole redevelopment: removing accumulated fine material from gravel pack by airlift pumping or compressed air surging; critical for borehole in sands and gravels where fine migration has blocked inter-granular pores. Mechanical brushing (PIG or brush on drill string): removes soft deposits from casing and screen interior; pre-treatment before acid. Pump replacement: submersible pump efficiency declines with wear (impeller wear, seal failure); pump test (discharge rate vs head curve measured in-situ) compared to original manufacturer curve; replace when efficiency loss exceeds 20 to 25 percent or when flow requirement cannot be met. Lead pump suppliers for borehole rehabilitation: Grundfos SP series, Franklin Electric, Xylem Lowara, KSB.
Frequently Asked Questions
How do you know when a water well needs rehabilitation?
Signs that indicate well rehabilitation is needed: (1) Declining specific capacity: pumping test showing specific capacity (flow rate per unit drawdown) has declined greater than 20 to 25 percent vs original commissioning data; compare current pump test results to baseline; (2) Reduced yield: pump can no longer maintain target flow rate without excessive drawdown (pump cavitation risk); (3) Water quality deterioration: increasing iron (greater than 0.2 mg/L), manganese, turbidity, or bacterial count indicating biological and chemical fouling; H2S odour indicating sulphate-reducing bacteria; (4) Increased energy consumption: pump running higher head (more electrical current draw) at same flow rate, indicating well loss (casing, screen or formation resistance increase); (5) CCTV inspection showing: incrustation visible on screen perforations; corrosion pitting on steel casing; ochre deposits in gravel pack zone; (6) Age: most boreholes require first rehabilitation after 5 to 15 years depending on groundwater chemistry and bacterial loading; scheduled rehabilitation at regular intervals (3 to 10 years) is more cost-effective than allowing severe fouling requiring more intensive treatment; (7) Downhole flowmeter showing: flow entering only from upper screen zones indicating blocking of lower zones. UK EA groundwater licences require metered abstraction; decline in licensed volume achievable without drawdown exceeding threshold is a regulatory trigger for assessment.
What chemicals are used to rehabilitate water wells?
Chemical rehabilitation agents for water wells: (1) Hydrochloric acid (HCl, 10 to 15 percent): dissolves calcium carbonate (calcite, aragonite) incrustation and iron hydroxide deposits; highly effective but must use corrosion inhibitor (phosphonate) to protect steel casing; generates CO2 gas during reaction - well must be vented; neutralisation required before pumping to drain; (2) Citric acid (2 to 5 percent): milder alternative to HCl for carbonate and some iron scales; safer handling; biodegradable; less effective for heavy incrustation; (3) Sulphamic acid (5 to 10 percent): effective for mixed iron-carbonate scales; less fuming than HCl; used in confined spaces; (4) EDTA (ethylenediaminetetraacetic acid, 1 to 2 percent): chelating agent that solubilises iron and manganese at neutral pH without acid; slower acting but safe for potable use wells; selected when acid poses licensing risk; (5) Sodium hypochlorite (50 to 500 mg/L as Cl2): biocide for iron-oxidising bacteria; contact 4 to 24 hours; then pumped to waste; check EA permit allows chlorinated water discharge; (6) Hydrogen peroxide (H2O2, 3 to 10 percent): alternative biocide that decomposes to water, leaving no chemical residue; safe disposal; effective against ochre-forming bacteria; (7) Polyphosphate dispersant (1 to 2 percent): breaks down ochre cake by dispersing iron particles before removal; used in conjunction with biocide before acid step.
How much does water well rehabilitation cost?
Well rehabilitation costs (UK market, 2024): Mobilisation and site setup (rig, equipment, crane, disposal tankers): GBP 3,000 to 8,000. Downhole CCTV survey (pre and post rehabilitation): GBP 500 to 1,500 each. Chemical treatment (acid, biocide, dispersant materials + application): GBP 2,000 to 8,000 depending on well depth and fouling severity; typically 2 to 4 treatment cycles. Airlift/surge development and pumping to waste: GBP 2,000 to 5,000 (depends on disposal volume - EA discharge consent required; tanker to offsite disposal if watercourse discharge not permitted). High-pressure jetting: GBP 1,500 to 4,000 additional. Post-rehabilitation pump test (step test + 12 to 24 hour constant rate): GBP 1,000 to 2,500. Pump replacement (if required): Grundfos SP borehole pump DN 100 to DN 200, 10 to 50 m3/h: pump supply GBP 2,000 to 15,000 plus installation GBP 1,000 to 3,000. Total rehabilitation project cost range: GBP 10,000 to 40,000 for standard borehole rehabilitation without pump replacement; GBP 20,000 to 70,000 with pump replacement and extensive fouling. ROI compared to new borehole: new borehole drilling and completion: GBP 50,000 to 500,000 depending on depth and hydrogeology; rehabilitation at GBP 20,000 to 40,000 is highly cost-effective if it restores 80 percent or more of original yield; if rehabilitation achieves only 50 percent of original yield, new borehole assessment may be warranted.
How long does water well rehabilitation take?
Well rehabilitation duration depends on fouling severity, well depth, and method: Typical project timeline: Day 1: site mobilisation, downhole CCTV survey, step pump test to confirm current specific capacity and identify problem zones; Day 2 to 4: chemical treatment (biocide injection and contact, acid injection and contact - each step typically 4 to 12 hours; 2 to 3 treatment cycles); Day 5 to 6: airlift surging and development, high-pressure jetting if required; purging and pumping to waste (may require 24 to 48 hours of pumping to clear treatment chemicals and mobilised deposits); Day 7: post-rehabilitation pump test (step test + 12 to 24 hour constant rate test); CCTV survey post-treatment; water quality sampling. Total: 5 to 10 working days for a standard borehole rehabilitation project. Longer projects: deep wells (greater than 150 m), heavily fouled wells requiring 3+ treatment cycles, or wells requiring pump extraction and replacement may take 10 to 20 working days. Out-of-service period: borehole is out of supply during chemical treatment (contamination risk from acid/biocide); 5 to 10 days is manageable with abstraction from alternative boreholes or temporary supply; if the well is the sole source, temporary water supply must be arranged. EA notification: well rehabilitation typically notified to EA before work under groundwater permit conditions; EA may require pre and post water quality sampling for monitoring purposes.
A fruit farm cooperative in Kent abstracted from a 95 m chalk borehole licensed at 450 m3/day. By year 12 specific capacity had fallen from 38 m3/h/m to 14 m3/h/m and iron in the raw water had risen to 4.2 mg/L, compromising irrigation scheduling and triggering abstraction licence non-compliance during the summer peak.
A hydrogeologist conducted a step-draw-down test and downhole CCTV survey, confirming ochre deposits across the lower 30 m of screen. A three-cycle rehabilitation programme applied sodium hypochlorite (200 mg/L) followed by citric acid (4 percent) and EDTA dispersant, with high-pressure rotary jetting between cycles. A post-rehabilitation Grundfos SP17-18 replacement pump was installed, reducing running head by 8 m.
Specific capacity recovered to 31 m3/h/m (82 percent of original), iron fell to 0.18 mg/L, and the farm sustained full licensed abstraction through the following two dry summers. Total rehabilitation cost was GBP 34,000 versus GBP 190,000 for a new borehole in comparable chalk.
Questions to Ask Shortlisted Providers
- 1
What baseline pump test and CCTV data will you compare against pre-rehabilitation figures?
Without a pre-rehabilitation baseline, there is no objective measure of how much specific capacity has been recovered or whether another treatment cycle is warranted.
- 2
Which chemical agents do you plan to use and have you checked our EA abstraction licence for discharge conditions?
Hydrochloric acid and high-concentration hypochlorite cannot be pumped to an unprotected watercourse; confirmation before mobilisation avoids delays and EA enforcement.
- 3
How many treatment cycles are included in your fixed price, and what triggers a day-rate extension?
Heavily fouled wells often require a third or fourth cycle; knowing the cost boundary prevents budget surprises mid-project.
- 4
What is your protocol if CCTV reveals casing damage or perforated zones that are irrecoverable?
Irreparable structural damage changes the economic calculus entirely; you need a clear decision tree before mobilising expensive plant.
- 5
Will you provide a post-rehabilitation pump test report to the format required for EA annual abstraction returns?
EA reporting requires documented specific capacity data; a properly formatted report from the contractor avoids a costly re-survey.
What Drives Cost in This Category
Extracting and reinstalling a submersible pump from 100+ m adds GBP 2,000 to 5,000 in crane time and rope-work; deeper wells with larger shaft diameters require heavier lifting equipment.
Each acid-biocide cycle costs GBP 1,500 to 3,000 in chemical materials and contact time; heavily fouled wells may need three to four cycles, doubling baseline chemical costs.
Acidic or chlorinated purge water that cannot be discharged to a watercourse must be tankered off-site at GBP 60 to 120 per m3; a deep well purge of 200 m3 can add GBP 12,000 to 24,000 alone.
If the submersible pump has worn impellers or damaged seals, replacement adds GBP 3,000 to 18,000 depending on shaft size and required head; worn pumps discovered during extraction always extend project duration and cost.
Key Regulations & Standards
Well rehabilitation work that temporarily suspends abstraction must be pre-notified to the EA; licence conditions may specify minimum post-rehabilitation water quality sampling before resuming full-rate abstraction.
If the borehole serves a private supply subject to PWS Regulations, the local authority must be notified of any interruption and post-rehabilitation water quality must be demonstrated compliant with WS(WQ)R 2016 before supply is restored.
Hydrochloric acid at 10 to 15 percent requires COSHH risk assessment, appropriate PPE (nitrile gloves, face shield, chemical-resistant suit), and an emergency spill plan on site; the MSDS must be held at the point of use.
The EA's Groundwater Source Protection Zone (SPZ) classification may impose additional restrictions on chemical types and concentrations used near public water supply boreholes; SPZ1 (inner zone) prohibits certain biocides.
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