Introduction

In unconsolidated heavy oil reservoirs, operators often face the same dilemma: strict sand control protects equipment but chokes production, while uncontrolled sanding briefly increases rates and then rapidly destroys pumps and wellbore integrity. CHOPS, Cold Heavy Oil Production with Sand, was developed as a cold heavy oil production technology that uses engineered, moderate sand output to improve near‑wellbore permeability and create more conductive flow channels in suitable reservoirs.

Once CHOPS is adopted as the development strategy, the artificial lift system must continuously handle cold heavy oil, sand, and evolving inflow conditions. Conventional elastomer‑based PCP designs often become the weak link under these conditions, while oil & gas all‑metal PCP design—implemented in HXBS solutions such as the FERROXIS® all‑metal conical PCP and the IntelliCPCP® system—provides a lifting architecture better matched to sand‑producing CHOPS wells.

CHOPS: Cold Heavy Oil Production with Sand

CHOPS is a non‑thermal primary heavy oil recovery technology in which cold heavy oil and formation sand are intentionally produced together under engineering control. The core concept is to use moderate, controlled sand influx to improve near‑wellbore permeability instead of treating all sand as an unacceptable risk.

In CHOPS‑based development, permeability‑damaging fines close to the wellbore are progressively mobilized and carried out of the near‑wellbore zone with the produced fluids. This process leads to the formation of high‑permeability flow channels that connect the wellbore to more distant parts of the reservoir, reducing flow resistance and supporting cold heavy oil inflow.

Multilateral flow guidance is often used together with this concept. Additional laterals or branches are created from the main wellbore, increasing reservoir contact area while controlled sand output enlarges and maintains high‑permeability regions along these flow paths. In combination, cold production, moderate sand output, and guided flow channels define CHOPS as a heavy oil development technology.

Artificial Lift Challenges in CHOPS Wells

CHOPS improves flow capacity around the wellbore but creates a demanding operating environment for artificial lift. The main conditions are high‑viscosity cold heavy oil, sustained sand production, evolving inflow patterns, and frequent gas‑liquid or foamy‑oil behavior near the wellbore.

Progressing cavity pumps are widely used with CHOPS because their volumetric displacement principle handles viscous, sand‑laden fluids and foamy oil more effectively than many alternative lift methods. However, under long‑term CHOPS operation, elastomer stators in conventional PCPs can suffer accelerated wear, loss of sealing, and frequent failures under sustained sand loading and changing operating conditions.

That is why the lift system must be selected as carefully as the development strategy itself. In CHOPS wells, the pump architecture has to tolerate sand as a continuous operating condition rather than as a temporary upset.

Oil & Gas All-Metal PCP Design for CHOPS Conditions

Oil & gas all‑metal PCP design replaces the elastomer stator with a metallic stator and uses a metallic rotor in a matched cavity profile, often with a conical form. For CHOPS wells, this design directly addresses the failure mechanisms that commonly affect conventional PCPs in sand‑producing heavy oil service.

The main structural features include a metallic stator and rotor, conical rotor–stator geometry, and hardened metal surfaces. These features remove elastomer swelling and degradation from the failure spectrum, improve abrasion resistance in continuous sand production, and allow running clearance to be controlled more precisely as well conditions change.

In CHOPS applications, these characteristics matter because sand remains part of the produced stream over long periods. The lift system has to keep operating while the well continues to produce cold heavy oil and solids, and that requires a pump structure designed for exactly this kind of abrasive, unstable service.

HXBS applies this design in the FERROXIS® all‑metal conical PCP, which uses an all‑metal stator and rotor with a conical profile and hardened surfaces for heavy oil lifting. As the downhole core of the IntelliCPCP® system, it provides the pump architecture needed for CHOPS‑style heavy oil wells where durability and solids handling are critical.

For related product background, see all‑metal progressive cavity pump solutions for heavy oil.

IntelliCPCP®: Integrated All-Metal PCP System for CHOPS-Style Wells

The IntelliCPCP® artificial lift system integrates the FERROXIS® all‑metal conical PCP with surface and wellhead components designed to operate as one unit in harsh wells. Its main subsystems include DynaRL® surface drive, THERMOLOCK® wellhead sealing, Graspos balancing, RodSavior® wear mitigation, and Synergix® intelligent VSD and monitoring.

In CHOPS wells, this integrated design supports stable lifting of cold heavy oil and sand under changing inflow and load conditions. It also provides dynamic clearance adjustment, sand‑handling sequences, and real‑time operating data that help reduce sticking risk, control torque variation, and optimize lifting behavior across the life of the well.

This system-level approach is important because CHOPS well performance depends on more than the downhole pump alone. Pump geometry, drive behavior, wellhead integrity, rod‑string loading, and monitoring logic all affect whether a sand‑producing heavy oil well can remain stable over the long term.

A broader overview is available in advanced artificial lift system solutions for heavy oil fields and HXBS artificial lift solutions.

Example: Stabilizing Lift in a Sand-Producing Heavy Oil Block

Field pain points In a shallow unconsolidated heavy oil block developed with CHOPS, cold production with controlled sand output improved well productivity, but the original elastomer‑stator PCPs quickly became the operational bottleneck. Under continuous sand-bearing flow and high-viscosity cold heavy oil, the pumps experienced rapid wear, repeated sticking, and short run life, which pushed workover frequency above an economically acceptable level.

HXBS solution The development strategy remained CHOPS, but the lift system was upgraded to IntelliCPCP® with the FERROXIS® all‑metal conical PCP, DynaRL® surface drive, THERMOLOCK® wellhead assembly, Graspos balancing, RodSavior® wear control, and Synergix® intelligent monitoring. This configuration improved solids tolerance, enabled finer control of rotor–stator clearance, and reduced the risk of sticking during sand surges and changing inflow conditions.

Results After implementation, pump‑sticking events were reduced, intervention frequency declined, and the block maintained more stable liquid production under sustained CHOPS conditions. The combined use of CHOPS technology and HXBS all‑metal PCP design strengthened the economic performance of cold heavy oil production in the block.

CHOPS Conditions and All-Metal PCP Design Requirements

FAQs

When should an operator consider replacing a conventional PCP in a CHOPS well?

Replacement should be considered when pump wear, sticking, and short run life begin to consume a large share of the production gains delivered by CHOPS. If workover frequency rises and elastomer-related failures become a recurring pattern, a shift to all‑metal PCP architecture becomes technically and economically relevant.

What parameters matter most when selecting an all-metal PCP for a CHOPS well?

The key parameters are solids tolerance, heavy-oil viscosity capability, rotor–stator surface hardness, clearance-control capability, and the degree of integration between the pump, drive, wellhead, and monitoring system.

Which operating data are most useful for optimizing a CHOPS well with intelligent lift?

Torque trends, speed, pressure behavior, current changes, and short-term load spikes are among the most useful indicators because they reveal sand surges, early sticking trends, and changes in pump efficiency.

Does a CHOPS well need special completion or flow-control measures when paired with an all-metal PCP?

Yes. Screen selection, inflow control, sand-management strategy, and wellhead operating logic all influence how effectively the pump can handle a sand-bearing stream while preserving production stability.

Is an all-metal PCP the best choice for every CHOPS well?

No. In milder wells with lower sand loading and lower intervention costs, conventional PCPs may still be economically acceptable. All‑metal PCPs become more attractive where sand, wear, and downtime have a larger impact on total lifecycle cost.

Conclusion

CHOPS improves heavy oil development by using cold production and controlled sand output to increase near‑wellbore permeability and sustain production from suitable unconsolidated reservoirs. When that development strategy is combined with oil & gas all‑metal PCP design, operators gain a more complete solution for managing both reservoir flow behavior and wellbore lifting performance in sand‑producing heavy oil wells.

HXBS brings these two elements together through CHOPS‑style heavy oil production and the IntelliCPCP® system built around the FERROXIS® all‑metal conical PCP. With stronger solids tolerance, more stable torque control, reduced sticking risk, and longer operating cycles, this combined solution helps improve production stability and field economics across the life of the well. For teams planning or optimizing CHOPS developments, a practical next step is to connect with HXBS through artificial lift solutions and use the IntelliCPCP® all‑metal conical PCP system as the basis for a CHOPS‑compatible lift design.