By TEBAOFLEX Jyen. Originally published on August 19, 2026.
Rapid gas decompression and longitudinal gas migration are different hazards in an electrical submersible pump installation. The first can damage cable materials as pressure falls; the second can carry well gas toward surface equipment through internal paths. A cable that resists one mechanism is not automatically qualified against the other.
How decompression damage develops
Gas can enter polymeric materials under pressure. If external pressure falls faster than gas can leave, internal stresses may cause swelling, blisters or splits. The outcome depends on gas composition, temperature, exposure history, material formulation, geometry and the pressure-change profile. No universal safe pulling speed or bar-per-minute limit is established here.
Cable armour, insulation and barrier layers form a complete design. Lead barriers or reinforced constructions can be selected for particular well conditions, but connections, manufacturing quality, mechanical damage and chemical compatibility remain important. “Solid conductor,” “lead sheath” or a branded polymer name is not proof of a gas-tight assembly.
Describe the well and the operating history
- Provide pressure and temperature profiles, fluid composition, gas partial pressures and expected chemical exposure.
- Describe start-up, shutdown, pressure cycling and retrieval conditions, including the proposed workover procedure.
- Identify the main cable, motor lead extension, splices, penetrators and surface termination as separate qualification items.
- Include mechanical handling, bending, clamp loading and any planned reuse.
Use the correct specification family
The original IEEE references must not be reversed: IEEE 1018 addressed EPR-insulated ESP cables, while IEEE 1019 addressed polypropylene insulation. IEEE 1017.2-2021 covers EPR-insulated ESP cable; IEEE identifies 1019-2013 as superseded by 1017.3-2021. State the agreed current edition and construction rather than treating these documents as generic five-cycle autoclave procedures.
Qualify decompression and migration separately
A representative material or assembly test should state the gas mixture, exposure pressure and temperature, dwell time, pressure ramp, number of cycles and examination method. Electrical and mechanical checks after exposure should match the product specification. A simple dry insulation-resistance result does not exclude internal decompression damage.
Longitudinal gas-flow tests require defined specimens, end preparation, pressure differential, duration and leak criterion. Water-swell tapes or an external wellhead packoff do not by themselves demonstrate blockage of gas paths inside conductors or cable interfaces.
Surface safety must be engineered
Well gas, especially hydrogen sulfide, creates toxic and flammable hazards. Surface barriers, seals, venting, detection, equipment classification and separation distances must follow the well operator’s engineered design and applicable regulations. Do not improvise exposed electrical joints or a vented enclosure from this article. Installation and testing require qualified personnel and approved isolation procedures.
Assess a retrieved cable before reuse
Record retrieval history and inspect for swelling, armour damage, kinks, damaged splices and changes in dimensions. Follow the cable supplier’s examination and electrical-test procedure before any reuse decision. Absence of visible blisters is not evidence that the entire cable is undamaged, and no reuse count is guaranteed here.
Sources and scope
IEEE 1017.2-2021: EPR-insulated ESP cable
IEEE 1019-2013: polypropylene insulation and supersession
SLB: ESP power cable application families
These references explain the relevant methods or manufacturer guidance. They do not certify a TEBAOFLEX product or establish results for a supplied batch.
Discuss your specification
For a project-specific cable specification, send the duty, installation drawing and required acceptance criteria to TEBAOFLEX. WhatsApp: +86 185 9591 3361. Request documented product ratings and test evidence before approval.