Mechanical-to-Electric Rig Retrofit — What Changes on the Pad

Moving from diesel-mechanical transmission toward electric motors and power and control rooms is what this note means by mechanical-to-electric. Scope varies by drilling versus workover, and by how much of the legacy drivetrain remains. No single bill of equipment fits every pad.

A mechanical drilling rig, in the catalog's language, adopts electric drive instead of diesel-engine drive. The reasons the catalog gives are higher efficiency and reliability, lower drilling cost, and less pollution. Those reasons are printed. They are not a new calculation, and this note does not attach a percentage to them.

The equipment page is electrified retrofit. The solution page that keeps the same scope, without repeating the sizing grid, is electrified retrofit for a mechanical drilling rig.

What actually changes

The drive prime mover changes. Diesel engines that turned the mechanical compound are not the drive the catalog is describing after the retrofit. Electric motors and frequency inverters take that role. The rig's mechanical structure is not redescribed here as a new mast or a new substructure. The published scope is electrical: incoming supply, transformation, inversion, low-voltage distribution, control, and a remote console.

That is different from choosing SCR or VFD for a rig that is already electric. VFD and SCR for a drilling rig compares those two electric-drive paths. A retrofit starts from a mechanical rig. The inverter rows on the retrofit table are the catalog's way of saying the new drive is variable-frequency, which is why VFD control sits next to this work even though the configuration columns are not the same sheet.

Equipment the catalog lists

The system comprises a high-voltage incoming-line cabinet, a transformer, a frequency inverter, 400 V switchgear, 600 V switchgear, a PLC cabinet, a remote driller's console, and other equipment. "Other equipment" is the catalog's own remainder. It is not an invitation to add unnamed packages.

Features named beside that list

The catalog names four features.

The configuration is matched to equipment already on the rig, so the electrical package meets the rig's power requirement rather than arriving as a single fixed skid for every mast.

The motors are variable-frequency drives. The catalog says this has little effect on the grid and a wide speed range. "Little effect" is the catalog's phrase. It is not a harmonic measurement, and it is not a substitute for the SVG scope when the source itself is an industrial grid. That source question is grid power with SVG and TSF and power supply control.

Faults on site can be diagnosed remotely. Operating parameters can be monitored remotely. Both sentences are about communication with the equipment. They do not name a network, a protocol, or a guaranteed response time.

The three rig classes and the table

Workover is not this sheet. Workover rig drive and workover rigs are the pages for that duty. Onshore drilling packages stay with drilling rigs and drilling rig electric drive.

The catalog applies the retrofit to rigs such as the 40LDB, the 50LDB, and the 70LDB, and the sizing table is printed in those three columns. The rows include high-voltage incoming, the transformer, and the frequency inverters. The product page is where those cells should be read. This note names the columns so a reader knows which sheet to open. It does not retype every cell, because a second copy drifts.

The same spread describes a permanent-magnet motor: the magnet is the excitation source, the structure is simple, and power density and efficiency are high. That description is catalog text for the motor, not a test report. Direct-drive and permanent-magnet rows that the catalog prints with the motors are on drilling motors and direct-drive and PM motors.

What the cases page is allowed to carry

The manual captions an electrification retrofit in Indonesia and a Sinopec electrification retrofit of a mechanical drilling rig. Those captions are already listed on cases. The solution page says they are not rating sheets. This note does not add a footage, a fuel volume, or a "result" those captions do not contain. If a caption is the reason for the inquiry, say so. The equipment list still has to be confirmed against the rig that is actually in the yard.

How to describe the rig in the inquiry

A retrofit inquiry needs the rig class if it is one of the three named columns, or a clear statement that it is not. It needs the loads that remain mechanical and the loads that must become electric. It needs the high voltage available at the lease if the incoming cabinet is in scope. It needs whether 400 V and 600 V distribution are both required. It needs whether the driller's console must be remote.

Request consultation on this page is the request, with a form in front of it. The reply should be answerable from the printed table plus the rig description. The form does not select equipment by itself.

Boundaries that keep the page honest

The catalog does not say every mechanical rig in a fleet is a 40LDB, 50LDB, or 70LDB. "Such as" means those are the named examples with a table. A different class needs its own written sizing.

The catalog does not print a pollution measurement or a cost delta. The words "reduce drilling cost" and "reduce pollution" stay as the catalog's purpose statement.

Remote diagnosis is not a staffed control room described on this site. Service scope, including what a technician does on site, is services.

Mud-pump control and top-drive control remain their own product pages when those loads are specified as electric packages rather than as part of the retrofit column. Link them when the inquiry names them: mud pump control and top drive control.

Read the product table for numbers. Use this note to see which numbers the catalog was willing to print, and which decisions are still a letter.