2016 Gas-Lift Workshop Page 2

2016 Gas-Lift Workshop Page 2

Fiber Optic Based Gas Lift Surveillance

Gijs Hemink

Murat Kerem

Shell Global Solution International B.V.

Abstract

Gas lift surveillance is one of the areas where fiber optic based Distributed Temperature Sensing (DTS) and Distributed Acoustic Sensing (DAS) may provide value by identifying actual lifting port and/or multi-porting gas lift valves.

Interpreting DTS data acquired in gas lifted oil wells equipped with a clamped fiber optic cable requires understanding of the (subtle) temperature variations that occur due to lift gas injection to correctly assess the status of the valve (lifting, shut, leaking).

A detailed hydraulic and thermal analysis of such a well has been conducted using a transient multiphase flow simulator in order to predict the temperature response of different multi-porting scenarios. The outcome of the modeling work shows that:

· The calculated temperatures for the simulated actual well test are in a very good agreement with the corresponding DTS traces coming from the well. The actual lifting port (orifice valve) is clearly visible in both.

· The calculated multi-porting responses however are different from the temperature variations observed in the DTS traces.

· The simulation results enhanced our current understanding of the thermal behavior in gas lifted oil producers as they showed that the temperature response of multi-porting can be visible on DTS data, but in a different way from what has previously been expected.

A DAS survey was conducted in the several oil producers where DAS measures the acoustic signature created by the injection of lift gas through a port. The interpretation shows that DAS indicates where lift gas is injected (the unloading or orifice valve) and that DAS responses to gas lift injection rates change. Furthermore, the DTS and DAS interpretation are in agreement, e.g. they indicate injection of lift gas through the same lifting port.

2016 ALRDC Gas-Lift Workshop

Call for Abstracts

May 16 – 20, 2016

Please complete this form to nominate a presentation for the 2016 ASME/ALRDC Gas-Lift Workshop. Please do not write in the shaded areas.

Registration Information / Information Required for Nomination
Name / Gijs Hemink
Company / Shell Global Solution International B.V.
Mailing Address / Andes 2.16N
City/State/Zip Code / Kessler Park 1, 2288 GS Rijswijk
Country / The Netherlands
Telephone Number / 0031704473067
FAX Number
E-Mail Address /
Information on Presentation
Type of Presentation (PowerPoint, Paper, Poster) / Powerpoint
Title of Presentation / Fiber Optic Based Gas Lift Surveillance
Lead Author / Gijs Hemink
Co-Authors / Murat Kerem
Proposed Subject Area (See Below)
Due Dates
Abstracts must be submitted by: / December 31, 2015
Completed papers must be submitted by: / April 1, 2016
Presentations must be submitted by: / April 1, 2016
Guidelines
Formal papers are not required, but are encouraged.
Use of the Standard Presentation Format provided by the Workshop Steering Committee is required.
Presentations must use a minimum font size of 20 point, Ariel, Bold, so the audience can easily read them.
Presentations must NOT be commercial in nature.
Presentations must follow the guidelines that can be found on www.alrdc.com, Workshops section.
If a presentation has been given elsewhere, approval must be obtained from the other organization to present it here.
Abstract
Maximum of 300 words. / Gas lift surveillance is one of the areas where Fibre optic based Distributed Temperature Sensing (DTS) and Distributed Acoustic Sensing (DAS) may provide value by identifying actual lifting port and/or multi-porting gas lift valves.
Interpreting DTS data acquired in gas lifted oil wells equipped with a clamped fibre optic cable requires understanding of the (subtle) temperature variations that occur due to lift gas injection to correctly assess the status of the valve (lifting, shut, leaking).
A detailed hydraulic and thermal analysis of such a well has been conducted using a transient multiphase flow simulator in order to predict the temperature response of different multi-porting scenarios. The outcome of the modeling work shows that:
· The calculated temperatures for the simulated actual well test are in a very good agreement with the corresponding DTS traces coming from the well. The actual lifting port (orifice valve) is clearly visible in both.
· The calculated multi-porting responses however are different from the temperature variations observed in the DTS traces.
· The simulation results enhanced our current understanding of the thermal behavior in gas lifted oil producers as they showed that the temperature response of multi-porting can be visible on DTS data, but in a different way from what has previously been expected.
A DAS survey was conducted in the several oil producers where DAS measures the acoustic signature created by the injection of lift gas through a port. The interpretation shows that DAS indicates where lift gas is injected (the unloading or orifice valve) and that DAS responses to gas lift injection rates change. Furthermore, the DTS and DAS interpretation are in agreement, e.g. they indicate injection of lift gas through the same lifting port.

Electronic submission of this form is preferred. But, it may also be FAX'd or mailed if necessary.

(a) Electronic:

(b) Fax: 1-210-695-1382

3100 Thousand Oaks Drive

Austin, Texas 78746

Presentations should "fit" within one of the following subject areas. We are interested in presentations from Operating Companies, Service Companies, Universities, and Consultants. We are especially interested in joint presentations by Operating and Service Companies.

Sub-Sea, Deepwater, TLP Gas-Lift

– Presentations and a panel discussion on offshore, deepwater gas-lift operations, including sub-sea, TLP’s, and multiphase boosting.

Gas-Lift Design

– Presentations and a panel discussion on gas-lift design for continuous, intermittent ,and dual gas-lift.

New or Developing Gas-Lift Technology

– Presentations and a panel discussion by Operating Companies, Service Companies, and others on new gas-lift technologies, how they are used, what their benefits are, etc.

Gas-Lift Standards

– Presentations and a panel discussion by Operating Companies, Service Companies, and others on use of gas-lift standards.

Gas-Lift Field Reviews, Experiences, Success Stories, Failures

– Presentations and a panel discussion by Operating Companies, Service Companies, or others on both successful and unsuccessful field applications of gas-lift.

Other

– Presentations and panel discussions by Operating Companies, Service Companies, or others on other areas of gas-lift that will be of interest to workshop attendees.