Oil and Gas Inventory Management for Oilfield Service Companies
How oilfield service companies track stock across yards, service trucks and wellsites, and get every consumable used on a job onto the field ticket.
- Inventory Management
A crew reaches location at 6 a.m. and opens the truck for the seal kit on the load list. It is not there. Someone used it on another job two days ago and nobody restocked the truck. The crew waits, a hot-shot runs from the yard and the job starts three hours late. Meanwhile the filters and fittings used yesterday never made it onto the field ticket, so the customer will not pay for them.
That is what inventory management looks like at an oilfield service company. It is not a single storeroom with a counter. It is stock spread across yards, trucks and wellsites, moving every day, and much of it billable. This guide is for operations and yard managers at service and rental companies who keep stock in more than one place.
What is inventory management in the oil and gas industry?
Inventory management in the oil and gas industry is knowing what stock you hold, where it is, what it is for and when it was used, then keeping enough of it in the right place without tying up cash. For an operator that usually means an MRO storeroom. For a service company it means yards, service trucks and wellsites, plus the field tickets that bill for what was used.
Why service company inventory is harder than a storeroom
Most oil and gas inventory advice assumes stock sits on shelves behind a counter and leaves through a pick ticket. Service companies work differently:
Stock moves all day: yard to truck, truck to wellsite, wellsite back to the yard or on to the next job.
Consumption happens in the field, where nobody is standing at a counter and the signal is often weak.
Some items are billed to the customer and some are not, and the difference has to show on the ticket.
Consumables, spare parts and serialized tools all mix on the same truck but need different tracking.
Returns come back dirty, part-used or damaged, and need checking before they go back on a shelf.
Separate your stock into four kinds
Tracking everything the same way is where most systems fail. Split stock by how it behaves, then track each kind the way it needs.
Kind of stock | Examples | Where it lives | Track it by | How it is billed |
Consumables | Filters, seals, fittings, lubricants, absorbent pads | Yard shelves and every service truck | Quantity per location, with a minimum and maximum | Usually line items on the field ticket |
Spare parts | Valve seats, seal kits, pump parts | Yard and shop, some on trucks | Quantity per location, linked to repair work orders | Charged to a repair or a job |
Serialized tools and equipment | Rental tools, pressure control iron, pumps | Yard, on location, in the shop | Serial number, with custody, status and certification | Rental or day rate on the ticket |
Job-specific materials | Pipe, special fittings bought for one job | Received at the yard, then sent to the job | Receipt against the purchase order and the job number | Passed through on the job invoice |
Serialized equipment needs its own record per item. Our guide to oilfield equipment tracking covers serial numbers, custody, certifications and inspections for that part of the fleet.
Where oilfield inventory leaks
The same five gaps show up at most service companies.
Truck stock nobody counts. The truck is a stocking location, but it is treated as part of the crew. Items go on and off without a record, so the yard thinks it has stock that is sitting in a truck two counties away.
Consumption that never reaches the ticket. The crew used six filters and a box of fittings, but the ticket shows labor and equipment only. The stock is gone and the revenue is lost.
Receipts nobody records. Deliveries arrive at the yard and go straight onto shelves or trucks. Without a receipt against the purchase order, accounts payable cannot match the invoice and the count is wrong from day one.
Transfers recorded as edits. Someone changes a location field instead of recording a transfer from one yard to another. The history disappears, and so does any chance of finding where the stock went.
Returns that go straight back on the shelf. Part-used and damaged items get mixed with new stock, and the next crew finds out on location.
How to set up inventory tracking, step by step
Step 1: Map every stocking location, including each truck
List every yard, shop, storage container and service truck. Give each truck its own location in the system. If stock can sit there overnight, it is a location.
Step 2: Build one item list with units and limits
Create one item list for the whole company, with a single unit of measure per item. Set a minimum and maximum quantity for each item at each location, starting with the 50 items that cause the most delays or the most cost.
Step 3: Record every receipt at the yard
When a delivery arrives, record the purchase order, the quantity received, the location it went to and a photo of the packing slip. Receipt of goods tracking is what lets accounts payable match supplier invoices and stops phantom stock entering the count.
Step 4: Issue stock to jobs, not to people
When stock leaves the yard for a job, issue it to the job number. When a truck is restocked, record the transfer from the yard to that truck. Every movement then has a reason attached.
Step 5: Capture consumption on the field ticket
The crew picks what they used from the truck’s stock list on the field ticket, on a phone, even without signal. The ticket bills the customer and reduces the truck’s stock in the same step, so there is no second entry for the office. If you want to see how tickets turn into invoices, read how teams move from field tickets to invoices.
Step 6: Count a little, often
Annual counts find problems months too late. Count fast-moving items on trucks weekly, yard stock by section each month and slow-moving stock each quarter. Investigate any difference above an agreed threshold before you adjust the count.
Step 7: Review the exceptions every week
One list, one short meeting: items below minimum, stock with no movement in 90 days, consumption on jobs with no matching ticket line, and count differences. Each line gets an owner and a date.
Service truck inventory: keep it simple
Trucks are where most of the money moves, so give them a routine crews will actually follow.
Set a standard load list for each job type, and load to the list.
Restock at the end of each shift or hitch from the yard, recorded as a transfer.
Scan items off the truck when they are used and onto the truck when they are restocked.
Compare what left each truck with what appeared on that truck’s tickets every week.
A truck that keeps showing more stock used than billed is your first place to look for lost revenue.
Tracking stock across yards and basins
Once one yard runs well, keep the rules the same everywhere. Use one item list and one set of units. Record yard-to-yard moves as transfers with a sender and a receiver. Check stock in other yards before buying or rushing an order, and report stock levels, aged stock and unbilled consumption by basin so you can see which yard is short and which is holding too much.
Connect inventory to maintenance
Spare parts demand follows the maintenance plan. Preventive work makes demand predictable, and repeat failures drive emergency orders. Our guide to spare parts management with AI covers forecasting and reorder points in more depth, and the oilfield equipment maintenance checklist shows the routine inspections that drive parts usage.
When to move off spreadsheets
A spreadsheet can run one yard with a few hundred items if one disciplined person owns it. You have outgrown it when you have more than one yard, stock on trucks, consumables billed on tickets, or several people editing the same file.
At that point, oil and gas asset management software gives you live inventory, transfer and utilization visibility across remote sites, works offline at the wellsite and syncs when crews are back in range, and turns field records into invoices.
To see this with your own yards, trucks and item list, book a demo with the Equipt team.
Frequently asked questions
What is inventory management in the oil and gas industry?
It is knowing what stock you hold, where it is, what it is for and when it was used, and keeping enough in the right place without tying up cash. Operators usually run an MRO storeroom. Service companies hold stock across yards, service trucks and wellsites, and bill much of it to customers on field tickets.
How do you manage inventory on service trucks?
Treat each truck as its own stocking location. Load to a standard list for the job type, record restocks from the yard as transfers, and capture items used on the field ticket so the truck’s stock drops when the customer is billed. Each week, compare what left each truck with what appeared on its tickets.
What is receipt of goods tracking in the oilfield?
It is recording each delivery when it arrives at the yard: the purchase order, the quantity received, the location it went to and a photo of the packing slip. It lets accounts payable match supplier invoices and keeps stock that never arrived out of the count.
How often should oilfield inventory be counted?
Count a little, often. Count fast-moving items on trucks weekly, yard stock by section monthly and slow-moving stock quarterly. Investigate differences above an agreed threshold before adjusting, because a repeated gap usually points to a process problem, not a counting error.
