straight answers from our engineering team-on energy storage performance, downhole tool selection, quality documentation, and exporting to Africa and the Middle East.
The 700 kW / 1.687 MWh cabinet covers the full workover range. Typical oilfield loads: – Workover rigs: 300–750 kW peak (100–350 kW average; 1,500–3,500 kWh/day) – Medium drilling rigs (1,500 HP): 1,100–2,500 kW peak (500–750 kW average) – Crew camps: 50–150 kW peak (30–80 kW average; 720–1,920 kWh/day) For drilling rigs and multi-rig sites, cabinets are paralleled — typically 2 to 5 units operating as one system.
No. The system is designed for zero-interruption operation: – The EMS (Energy Management System) monitors each battery cluster’s state of charge in real time – When a cabinet’s SOC drops below the 15–20% threshold, the STS (Static Transfer Switch) transfers load in under 20 milliseconds – The depleted cabinet automatically drops into standby / recharge mode while the others continue supplying the load 20 ms is 1/50th of a 50 Hz cycle — far below the ride-through time of any VFD or motor controller on a drilling or workover rig. The rig never sees a power gap.
Both modes are available, and the EMS is configured per site: – Load-sharing mode (default): all active cabinets discharge together, extending total runtime. When one depletes, it drops off automatically and seamlessly. – Sequential mode (optional): one cabinet runs until depleted, then the next takes over — useful when you want to keep some cabinets fully charged as a strategic reserve. For daily operation we recommend load-sharing; sequential mode can be enabled for specific scenarios (e.g., keeping 2 of 5 cabinets as emergency reserve during sandstorm season)
From a 500 kW diesel genset using surplus capacity, a full recharge takes 3–4 hours. At the maximum PCS rate (~700 kW, grid connection), about 2.4 hours. In practice, the genset recharges the ESS during low-load periods — for example while the rig is tripping pipe and the mud pumps are off — which fits naturally within a 24-hour workover cycle.
Yes. In a PV + ESS + diesel hybrid, the solar array supplies the loads and charges the cabinets by day; the cabinets carry the site through the night with the diesel genset off (silent night operation). On 2–3 consecutive cloudy days, the ESS supplies base load while the genset supplements at 30–50% load; if bad weather extends beyond that, the genset takes over and the ESS recharges when the sun returns. The Sahara offers 3,000+ sunshine hours per year — solar electricity at a levelized cost of $0.03–0.05/kWh versus $0.20–0.35/kWh for diesel delivered to remote sites.
Depends on the configuration: – ESS + diesel hybrid: 60–80% diesel reduction, with the genset running only during recharge windows – PV + ESS + diesel: 70–80% reduction in hybrid sizing, up to 90–95% in near-fully-renewable configurations For a fleet scenario (e.g., 20 workover rigs + 20 camps), a 10–12 MW PV array with 25–30 ESS cabinets typically delivers 70–80% diesel reduction with a 3–5 year payback.
That is exactly the problem the system solves. At remote sites, delivered diesel costs $0.80–1.10/L once trucking is included, and a fuel run-out can idle a rig at $30,000–80,000/day. A single ESS cabinet provides 2–4 days of autonomous power — bridging the resupply gap. With PV added, a site needs fuel trucking only for emergency backup (roughly one truckload every 1–2 months instead of 4–8 per month), and fuel transport cost drops by 85–95%. The cabinet itself is a standard 20 ft ISO container — one truck delivery, then years of operation with no fuel trucks, no fuel storage tanks, no spill risk, and no fuel theft in transit.
The cabinet is rated IP54 for dust and water ingress, and operates from -20 °C to +55 °C — built for desert and remote-site duty. Installation requires a level pad, standard electrical tie-in at the LV interface, and commissioning by our engineers or a certified partner. Site-specific configuration (load profile, EMS settings, hybrid control strategy) is confirmed during a technical review before delivery.
Standard range is 4-1/2″ to 13-5/8″ casing; other sizes are engineered on request. Every system is configured to the customer’s casing program and planned trajectory — whipstock face angle, window length, and mill selection are defined per well, not copied from a catalog.
A matched set, supplied and quality-controlled as one package: – Whipstock body (deflection ramp) – Anchor / connector – Flex mill (first-stage window opener) – Mechanical lead mill (full window cut to geometry) – Die collar (sets and verifies the anchor at depth) – Accessories — hinge pins, lead-mill inserts, and installation hardware Each component is dimensionally verified against the approved drawing before shipment.
Connections per API Spec 7-2 / ISO 10424-2 — for example 2-7/8 PAC, with other connections on request. Load-bearing components are manufactured from 42CrMo or AISI 4140, heat treated to tensile strength ≥ 110 ksi (≥ 758 MPa), verified by mechanical testing report. Design basis follows API 7-2 / ISO 10424-2 with API 7-1 / 7G workover practices where applicable.
Three inputs decide the tool:
1. The fish — type (pipe, collar, tool, debris), size, and whether its bore or OD is accessible
2. The wellbore — casing program (size, weight, ID) and clearance
3. The objective — recover, washover, mill, or sidetrack
As a rule of thumb: overshot when the fish OD is accessible, releasing spear when the bore is open, jar to free a stuck fish after engagement, and an impression block first whenever the fish top is uncertain — one survey run replaces guesswork.
Send us these three inputs and our engineering team confirms the tool, catch size, and documentation package before you order.
Because a 0.1–0.2″ ID difference between adjacent casing weights decides whether a grapple grips or slips. Example for 7″ casing: 26 lb/ft has an ID of 6.276″ while 29 lb/ft is 6.184″ — a grapple matched to one will not reliably engage the other. Heverda works on a strict principle: one catch size = one part number. Each grapple is matched to a precise casing weight and verified by CMM measurement before shipment, so POs are unambiguous and field engagement is predictable. Matching tables from 4-1/2″ to 13-5/8″ casing are available on request.
Yes. Seal kits and service accessories are stocked for major jar sizes (4.75″, 6.5″, 8″), with quick turnaround for refurbishment between runs. Re-dress and spare-part supply is also available for whipstock systems used in multi-stage sidetracks.
Yes — junk baskets, magnets, washover shoes, and custom recovery tools are built to order, with dimensions, material, and connections per the operator’s requirement. Non-standard sizes, release configurations, and HPHT options are engineered per well.
Heverda drilling tools are delivered and proven in active projects across North Africa — including a 13-5/8″ whipstock system accepted for a workover program with repeat orders, a 4-1/2″ system configured with 2-7/8 PAC connections, spear and grapple sets with precision-matched catch sizes, jar seal kits on expedited schedules, and circulating subs in ongoing operations. Reference deliveries and performance records are available under NDA for qualified operators.
Every shipment includes a complete English technical file: – Mill Test Certificate (MTC) / material certificates (EN 10204 3.1 for fishing tools) – Heat treatment and mechanical properties reports (tensile, yield, elongation, impact) – Chemical composition analysis – Dimensional inspection report — CMM-verified for catch sizes and critical dimensions – NDT reports (UT / MT / PT, as applicable) – First Article Inspection (FAI) on critical components, plus final inspection with photo/video documentation – Packing list, product certificates, and certificate of origin Third-party inspection (SGS / BV or nominated) is available on request.
Send us your technical inputs — for drilling tools: casing size, planned window depth and trajectory, or fish type and casing program; for energy storage: site load profile and current power setup. We respond with a recommended configuration and a technical review before quoting. A 60-minute technical session (Teams/Webex) with our engineering team is available for deep-dives on switching logic, EMS configuration, or hybrid control strategy.
Heverda is operated by Shenzhen Hexinhe Technology Co., Ltd., based in Shenzhen, China. We export worldwide with a focus on Africa and the Middle East — Algeria, Libya, Egypt, the Gulf states, and beyond — under standard Incoterms (typically CIF or DAP to your port of choice).
Full customs-compliance package: certificate of origin (with embassy legalization where required), commercial invoice, packing list, and shipping documents (B/L or AWB) per destination market. For Algeria-bound shipments we support the standard pre-shipment inspection requirements (BV / SGS) and consularized documentation workflows.
Our engineering team typically responds within one business day. Send us your question — or your casing program, fish details, or site load profile — and get a straight technical answer, not a sales pitch.