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Systematic Evaluation of Managed Pressure Drilling Variants: A

Framework-Based Comparative Review for Operational Decision

Support

Jagroop Singh Yadav*, Dr. Harsh Vardhan

Department of Mathematics, Shri Venkateshwara University, Gajraula, Uttar Pradesh, India

DOI:

https://doi.org/10.51583/IJLTEMAS.2026.150500063

Received: 08 April 2026; Accepted: 13 April 2026; Published: 01 June 2026

ABSTRACT

MPD has evolved from a niche technique into a mainstream drilling capability over the last decade. It is now

used in HPHT, deepwater, unconventional tight-gas, and sour-gas reservoirs. Despite this widespread adoption,

the operational question of which MPD variant is best suited to a particular well profile has historically been

addressed in the published literature on a case-by-case basis, without structured comparative synthesis. This

paper addresses that gap through a systematic framework-based evaluation of fourteen MPD case-study

publications sourced from the SPE and IADC literature between 2015 and 2025. A six-dimensional analytical

framework, inductively developed from the recurring performance themes within the corpus, serves as the

uniform evaluative instrument. The six dimensions encompass: well-control sensitivity and detection thresholds;

narrow-margin pressure window navigation; non-productive time (NPT) and invisible lost-time reduction; rate-

of-penetration (ROP) enhancement relative to conventional baselines; cementing and tripping operational

reliability; and economic performance across deployment contexts. Synthesis findings confirm that MPD

delivers well-control detection sensitivity approximately one to two orders of magnitude superior to conventional

pit-volume methods; that variant selection materially affects operational outcomes; that NPT reduction is

robustly demonstrated while ROP enhancement evidence remains comparatively sparse; and that economic

viability is strongly contingent on multi-well campaign scale. A structured application-domain selection map,

matching ten canonical operational situations to corpus-preferred MPD variants across three evidence-calibrated

confidence tiers, is presented as the primary decision-support contribution of this review.

Keywords: Managed Pressure Drilling; Well Control; Narrow-Margin Drilling; Comparative Framework;

CBHP; PMCD; ABP; CML; Selection Map; Drilling Engineering

INTRODUCTION

The global hydrocarbon industry has progressively migrated into operational settings of mounting geological

complexity. Deepwater and ultra-deepwater development, ultra-HPHT exploration, naturally fractured sour-gas

reservoirs, and unconventional tight-gas multi-well campaigns have each transitioned from exceptional to

routine operational categories within the past decade. A defining geological characteristic shared across these

settings is a narrow operating window between formation pore pressure and fracture gradient, a characteristic

that directly challenges the fundamental assumptions underpinning conventional drilling practice.

Conventional drilling manages annular pressure primarily through hydrostatic mud-weight selection. This

approach lacks the precision and rapid-response capability that narrow-margin operations demand. Influx

detection relies on pit-volume monitoring at sensitivities typically in the range of 10–25 barrels, and the standard

response to a detected influx proceeds through the multi-step shut-in-and-circulate-out kick-kill procedure — a

process that requires hours to complete and substantial overbalance margin to execute safely. In narrow-margin

environments, these limitations translate directly into elevated well-control risk, increased non-productive time,

and reduced economic performance.

Managed Pressure Drilling (MPD) was engineered specifically to address these limitations. Its defining

architectural innovation is the introduction of a controllable surface back-pressure as a fourth pressure-

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management lever — supplementing the hydrostatic, friction, and bottom-hole-pressure contributions that

conventional drilling employs. By dynamically modulating surface back-pressure through a controllable choke

manifold, MPD enables the operator to position the annular pressure profile precisely along the narrow line

between pore pressure and fracture gradient across the full well depth, rather than fixing the annular pressure at

a constant overbalance that must be tolerable at every depth simultaneously. The closed-annulus architecture,

incorporating a Rotating Control Device (RCD) at the wellhead, a Coriolis flow meter on the return line, and a

real-time mass-balance computation comparing pump-in and return-flow rates, simultaneously delivers an order-

of-magnitude improvement in influx detection sensitivity relative to conventional pit-volume monitoring.

Despite more than a decade of operational deployment across multiple continental settings, the published MPD

literature has been characterised predominantly by individual case-study reporting rather than structured

comparative synthesis. This reporting pattern has left operators, service providers, regulators, and academic

researchers without a consolidated evidential basis for understanding how MPD variants compare in

performance across differing operational settings — a gap with direct practical consequences for variant

selection decisions. This paper addresses that gap through systematic framework-based comparative analysis of

fourteen SPE and IADC case-study publications from 2015–2025, and presents a structured application-domain

selection map as its principal decision-support output.

METHODOLOGY

Corpus Definition and Selection Criteria

The analytical corpus comprises fourteen technical papers drawn from the SPE and IADC published literature

over the 2015–2025 decade, selected to represent the operational, geographical, and technical breadth of

contemporary MPD practice. Papers were included on satisfaction of five explicit criteria: (i) inclusion in

OnePetro or equivalent peer-review-screened technical-publication infrastructure; (ii) substantive operational

reporting extending beyond procedural overview; (iii) representation of a distinct operational variant or

operational context not duplicated elsewhere in the corpus; (iv) publication within the 2015–2025 window; and

(v) sufficient analytical content to support uniform framework application across all six evaluation dimensions.

The resulting corpus spans North America (three approaches), Asia-Pacific (five), the Middle East (two), Europe

and South America (one each), and laboratory or test-rig controlled settings (two).

A publication-bias limitation inherent to this selection methodology warrants acknowledgement: papers

reporting failed or aborted MPD deployments are less likely to appear in the peer-reviewed literature than

successful applications, which may lead to a positive-outcome skew in the corpus. Future reviews should seek

to incorporate service-company internal datasets and operator after-action reports to mitigate this bias.

Six-Dimensional Analytical Framework

The analytical framework was constructed inductively through iterative thematic analysis of the corpus prior to

formal cross-case assessment. Six performance dimensions emerged as the recurring evaluative themes against

which published cases report operational outcomes. To strengthen the credibility and generalisability of the

inductively derived framework, the six dimensions were subsequently applied as a sanity check against two

corpus-external case studies not included in the original fourteen (Approach A: a North Sea HPHT re-entry well;

Approach B: a shallow unconventional well in North America). Both cases mapped coherently onto the

framework without requiring dimensional modification, providing an initial cross-validation indication. Formal

industry validation through a structured expert-panel review is recommended as a priority next step.

Dim.

Dimension Name

Description

Well-Control

Sensitivity

Detection thresholds, response latency, and robustness across

operational modes.

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Narrow-Margin

Navigation

Quantification of the operating-window width within which

the MPD approach maintained successful drilling without

fracturing or influx.

NPT & Invisible

Lost-Time Reduction

Measurable reductions in non-productive time and invisible

lost time attributable to MPD deployment.

ROP Enhancement

Rate-of-penetration improvement against a defined

conventional baseline.

Cementing &

Tripping Reliability

Operational reliability of cementing and tripping operations

conducted under MPD-managed pressure conditions.

Economic

Performance

Capital, mobilisation, and operational cost analysis across

single-well and multi-well deployment contexts.

Table F1. Six-dimensional comparative analytical framework applied uniformly across fourteen corpus

approaches. Dimensions D1 through D6 are inductively derived from recurring performance themes in the

literature.

Data-Extraction Protocol

Each corpus paper was processed through a uniform five-section data-extraction template: (§1) operational

context — geography, operator identity, well architecture, reservoir conditions, and operating window

characteristics; (§2) MPD configuration — variant classification, equipment spread, operational procedures, and

distinctive technical features; (§3) operational outcomes — well-control events, NPT quantification, ROP

measurements, cementing results, and economic data; (§4) critical analysis — enabling factors, operational

limitations, generalisability assessment, and evidential strength evaluation; and (§5) framework assessment —

primary, secondary, or absent classification of the approach against each of the six framework dimensions D1

through D6. Uniform application of the protocol across all fourteen approaches produces commensurable per-

approach outputs that directly support the cross-case synthesis reported in Section 3.

RESULTS: CROSS-CASE COMPARATIVE FINDINGS

Well-Control Effectiveness (D1)

The most robust cross-case finding from the structured review is the qualitatively superior influx detection

sensitivity achieved by MPD-equipped drilling operations. Eleven of the fourteen corpus approaches provide

specific detection-sensitivity evidence. Quantitative outcomes include the 53-well Saudi unconventional tight-

gas CBHP campaign's Coriolis-derived detection threshold of 3 gallons per minute (Approach 13), the UK North

Sea HPHT infill well's containment of a 0.06 m³ influx within a single circulation (Approach 11), and the West

Canadian Dynamic Well Control deployment's sub-barrel simulation outcomes validated against field operations

(Approach 1).

The detection-sensitivity advantage is consistent across all represented operational contexts, spanning onshore

tight-gas horizontal wells, offshore HPHT infill wells, deepwater development campaigns, and naturally

fractured sour-gas reservoirs. The underlying mechanism is consistent across approaches: the closed-loop

annulus architecture, combined with Coriolis return-flow measurement and real-time mass-balance computation,

enables detection of influxes substantially below the pit-volume threshold on which conventional drilling

depends. The aggregate well-control finding extends beyond detection to encompass response latency reduction

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and mode robustness, with MPD's well-control advantage demonstrated across drilling, connection, tripping,

and cementing operational modes.

Figure 2. Detection-sensitivity comparison across corpus approaches. MPD configurations consistently

achieve approximately one to two orders of magnitude superior minimum-detection performance

relative to conventional pit-volume kick detection methods.

Drilling Efficiency Outcomes (D3 and D4)

The corpus supports a strong and well-evidenced case for NPT reduction (D3) and a comparatively thinner

evidentiary foundation for direct ROP enhancement (D4). NPT-reduction outcomes documented across the

corpus include the Gulf of Thailand ultra-high-temperature CBHP campaign's approximately twenty-day

operational saving against the conventional well baseline (Approach 3), the SINOPEC multi-mode gas-influx

detection model's reported NPT reduction of sixty percent or greater across the monitored campaign (Approach

10), and the elimination of contingency casing strings demonstrated repeatedly across multiple corpus

approaches (Approaches 2, 14, and others). These outcomes reflect both the direct well-control advantage of

MPD and the secondary operational benefits of closed-annulus architecture.

ROP-enhancement evidence is more limited in both quantity and quality. Only the 53-well Saudi unconventional

tight-gas campaign (Approach 13) provides a field-scale ROP comparison against a clearly defined conventional

baseline. Even this strongest evidence is complicated by operational-team-learning effects across the campaign,

which confound direct attribution of ROP improvements to the MPD configuration alone rather than to

accumulated crew experience. The asymmetric evidence base between NPT reduction and ROP enhancement is

identified as one of the principal evidence gaps requiring structured research attention. The scarcity of ROP-

enhancement data is attributable to two compounding factors: inconsistent ROP reporting conventions across

operators and service providers, and confounding of MPD-specific effects with contemporaneous bit design and

drilling-parameter optimisation. Standardising ROP measurement and reporting protocols — including baseline-

well specification and crew-learning correction methods — in future multi-well campaigns would substantially

close this evidence gap.

Economic Performance (D6)

Cross-case evidence on economic performance is anchored by the operator-authored business-case analyses

presented in the Shell deepwater Gulf of Mexico ABP study (Approach 8) and the Vito Phase-2 CML campaign

(Approach 14). Both analyses demonstrate that MPD's economic justification depends critically on the multi-

well-campaign versus single-well deployment distinction. Campaign-scale amortisation of mobilisation costs,

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combined with operational-team learning accumulated across multiple wells, produces a strongly positive

economic case in multi-well applications. As a practical threshold, corpus evidence suggests positive economic

returns are consistently achieved in campaigns encompassing six or more wells or involving total drilling budgets

exceeding approximately USD 30 million, where mobilisation cost amortisation and learning-curve efficiency

gains combine to produce a net positive case. Single-well economic justification requires substantially larger

per-well operational benefits — typically measurable NPT avoidance or well-count reduction through casing-

string elimination — to overcome the fixed costs of MPD equipment mobilisation and specialist personnel.

Service-provider-authored economic reporting across the remainder of the corpus tends to understate the

incremental ongoing operational costs that operator-authored analyses surface transparently. This systematic

asymmetry between operator-authored and service-provider-authored economic reporting has direct implications

for the strength and generalisability of economic conclusions drawn from the published literature and should be

acknowledged explicitly in any deployment economic analysis.

Application-Domain Selection Map

The primary decision-support output of this review is the application-domain selection map, which

systematically matches canonical operational situations identified from the corpus to corpus-preferred MPD

variants, with explicit confidence-tier calibration reflecting the strength and consistency of the underlying

evidence. Table 1 presents the selection map in abbreviated form.

Tier 1 entries are supported by multiple corpus approaches with consistent outcomes and can be adopted with

high operational confidence. Tier 2 entries are supported by single approaches with substantive evidence and

should be treated as working hypotheses requiring verification against specific operational context. Tier 3 entries

are supported by foundational or prospective evidence and should be treated as directional indications rather

than as direct deployment recommendations pending additional field validation.

Operational Situation

Preferred MPD Variant

Confidence Tier

HPHT Exploration Wells

CBHP

Tier 1

Ultra-HPHT (T > 200 °C)

CBHP + Advanced ECD Model

Tier 1

Tight-Gas Horizontal Multi-Well Campaign

CBHP + Continuous Casing System

Tier 1

Ultra-HPHT Liner Cementing

Managed Pressure Cementing (MPC)

Tier 2

Deepwater MODU Operations

ABP (Air/Light-Fluid Bypass)

Tier 2

Deepwater Curved PP/FG Profile

CML (Controlled Mud Level)

Tier 2

Sour-Gas Fractured Reservoir

CBHP + Gas-Tight RCD

Tier 2

Mature / Depleted Reservoir Zones

PMCD

Tier 3

Autonomous Well-Control Response

CBHP + Automated Well Control

Tier 3

Table 1. Application-Domain Selection Map: Canonical Operational Situations Matched to Corpus-Preferred

MPD Variants across Three Evidence-Calibrated Confidence Tiers.

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DISCUSSION

Three principal observations from the cross-case synthesis merit extended discussion.

Variant-Choice Consequentiality. The finding that MPD variant choice materially affects operational

outcomes carries direct practical implications for the two-stage decision framework that operators contemplating

MPD adoption should employ. The Vito Phase-2 deepwater campaign (Approach 14) provides the corpus's most

instructive single illustration through its explicit CML-versus-ABP-versus-conventional comparison conducted

on a common operational substrate. Operators should approach the adoption decision in two distinct stages: a

first-stage assessment of whether to adopt MPD at all, resting primarily on the well-control and narrow-margin-

navigation evidence; and a second-stage assessment of which MPD variant to adopt, resting on the operational-

situation-to-variant matching that the selection map supports. Operators treating the decision as a single stage

may achieve acceptable outcomes but will not capture the full operational and economic value available from

rigorous variant selection.

Evidence Asymmetry in Drilling Efficiency. The asymmetry between the strong NPT-reduction evidence base

and the thinner ROP-enhancement evidence base reflects the structure of the published literature rather than any

inherent technological limitation of MPD. Operators report NPT-reduction outcomes more readily because NPT

reduction carries transparent cost implications that directly motivate publication. ROP enhancement, by contrast,

requires careful counterfactual construction against a conventional baseline that is not always available in single-

well deployments and is subject to learning-curve confounding in multi-well campaigns. The practical

implication is that systematic ROP-comparison studies — ideally structured through joint-industry-project

mechanisms with pre-specified conventional baselines and controlled for crew-learning effects — represent the

highest-value incremental research investment for closing this evidence gap.

Foundational Technology Maturation. The foundational contributions represented in the corpus —

particularly the gas-tight RCD qualification to API 16RCD documented in Approach 5 and the autonomous-

response test-rig demonstration of Approach 12 — represent technological investments whose full operational

value remains to be captured. Both establish capabilities whose field-operational deployment is more recent and

less comprehensively documented than the underlying technologies themselves. Service providers investing in

field-validation and commercial deployment of these foundational capabilities are positioning themselves to

capture disproportionate operational-value share as the MPD market continues to mature and as autonomous

well-control requirements become increasingly mainstream.

CONCLUSIONS

Systematic framework-based comparative analysis of fourteen SPE and IADC MPD case-study publications

from 2015–2025 supports the following principal conclusions:

(1) MPD achieves qualitatively superior influx detection sensitivity across all operational contexts

represented in the corpus, approximately one to two orders of magnitude better than conventional pit-volume

kick detection. This is the most robust and consistently supported cross-case finding.

(2) MPD variant choice is consequential to operational outcomes, and the corpus supports defensible variant-

to-situation matching across three confidence tiers. The application-domain selection map (Table 1) is the

primary decision-support contribution of this review.

(3) NPT-reduction evidence is well-demonstrated and consistent across the corpus, while direct ROP-

enhancement evidence is asymmetrically sparse. This asymmetry reflects the reporting structure of the

published literature and defines a specific priority research gap.

(4) Economic performance is critically dependent on the multi-well-campaign versus single-well

deployment distinction. Operator-authored economic analyses carry disproportionate evidential weight

relative to service-provider-authored reporting and should be preferentially weighted in deployment

economic assessments.

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(5) Specific evidence gaps — autonomous-response field validation, regional economic calibration across

international cost environments, and dedicated PMCD case coverage — constitute a structured research

agenda for the continuing development of MPD practice. Field validation of autonomous well control across

multi-well campaigns is identified as the highest-priority unresolved research question.

The methodological contribution — the petroleum-engineering-specific adaptation of the structured comparative

review research tradition — is offered as a replicable template for adjacent comparative questions in drilling

engineering, including wellbore-strengthening technique evaluation, drilling-automation-system comparison,

and completion-technology comparative analysis.

Ethical Considerations

This study is a secondary analytical review of publicly available technical publications and does not involve

human participants, animal subjects, or primary data collection. No ethical approval was required. The authors

declare no conflict of interest. This research received no specific funding from public, commercial, or not-for-

profit funding agencies.

Data Availability

All primary data supporting this review are drawn from the fourteen technical papers cited in the References

section, each publicly accessible through the OnePetro technical publication database (www.onepetro.org). No

proprietary datasets were generated or analysed in the course of this study.

ACKNOWLEDGMENTS

The authors acknowledge the authors of the fourteen SPE and IADC technical papers constituting the analytical

corpus, whose substantive operational reporting makes structured comparative analysis possible. The authors

further acknowledge the Society of Petroleum Engineers (SPE) and the International Association of Drilling

Contractors (IADC) for maintaining the technical-publication infrastructure on which this analysis depends, and

Shri Venkateshwara University, Gajraula, for institutional support enabling this research.

REFERENCES

1. Kinik, K., Gumus, F., & Osayande, N. (2015). Constant bottom-hole pressure managed pressure drilling

and dynamic well control: Western Canada field application. SPE Drilling & Completion, 30(4), SPE-

168948-PA. https://doi.org/10.2118/168948-PA

2. Tan, K. M., Ahmad, F., Tan, W. L., & Goh, C. S. (2015). Successful application of managed pressure

cementing in an ultra-HPHT well offshore Malaysia. Proceedings of the SPE/IADC Managed Pressure

Drilling and Underbalanced Operations Conference, SPE/IADC-173041-MS.

3. Loux, B., Hargreaves, D., & Nguyen, V. (2015). Constant bottom-hole pressure managed pressure drilling

application in ultra-high-temperature wells, Gulf of Thailand. Proceedings of the SPE/IADC Asia Pacific

Drilling Technology Conference, SPE-176046-MS.

4. Bao Ta Quoc. (2016). HPHT best practices and lessons learned in offshore Vietnam using managed

pressure drilling. Proceedings of the IADC/SPE Asia Pacific Drilling Technology Conference, IADC/SPE-

180637-MS.

5. Mahmood, F., Barkat, B., Abshire, K., & Chitty, G. (2017). Industry-first qualification of a rotating control

device for gas-tight service per API 16RCD. Proceedings of the SPE/IADC Drilling Conference and

Exhibition, SPE/IADC-185290-MS.

6. Safipour, R., & Mavaddat, Y. (2017). Managed pressure drilling planning study for a high-sulphur

fractured reservoir in southwest Iran. Proceedings of the Abu Dhabi International Petroleum Exhibition

and Conference, SPE-188694-MS.

7. Yin, Q., Liu, G., Li, H., & Zhou, Y. (2020). A field case study of managed pressure drilling in ultra-HPHT

offshore well, South China Sea. SPE Drilling & Completion, 35(2), SPE-191060-PA.

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8. Moghazy, S., Goins, K., & Nakagawa, E. (2019). Building the business case for air- or light-fluid-bypass

managed pressure drilling in deepwater Gulf of Mexico operations. Proceedings of the SPE/IADC

International Drilling Conference, SPE/IADC-194538-MS.

9. Arellano, J. (2020). Application of managed pressure drilling and continuous circulation system in the

Perla gas field, offshore Venezuela. Proceedings of the SPE Latin American and Caribbean Petroleum

Engineering Conference, SPE-199065-MS.

10. Fan, H., Li, J., Liu, G., & Wang, H. (2021). A comprehensive gas-influx detection model for multi-mode

managed pressure drilling operations in the Fuling shale gas field. Proceedings of the IADC/SPE

International Drilling Conference, IADC/SPE-201001-MS.

11. Kamal, R., Skadsem, H. J., Cayeux, E., & Friis, H. A. (2021). Managed pressure drilling on an HPHT

infill well in the UK Central Graben North Sea. Proceedings of the SPE/IADC International Drilling

Conference, SPE/IADC-202107-MS.

12. Atchison, B., & Wuest, C. (2021). Integration of managed pressure drilling with automated well control:

Test-rig demonstration. Proceedings of the IADC/SPE International Drilling Conference, IADC/SPE-

206385-MS.

13. Uddin, M., Al-Yami, A., Al-Shammari, B., & Khan, M. (2024). Constant bottom-hole pressure managed

pressure drilling across fifty-three horizontal wells in a Saudi unconventional tight-gas field. Proceedings

of the SPE/IADC International Drilling Conference, SPE/IADC-219602-MS.

14. Limaye, A., Cook, J., Eriksen, K., & Vargo, R. (2025). Phase-2 controlled mud-level managed pressure

drilling on a five-well deepwater campaign at the Vito field, Gulf of Mexico. Proceedings of the IADC/SPE

International Drilling Conference, IADC/SPE-228374-MS.

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