• No results found

Paper B: Reservoir Characterization during underbalanced drilling (UBD): Methodology and Active Tests

N/A
N/A
Info
Nedlasting
Protected

Academic year: 2022

Share "Paper B: Reservoir Characterization during underbalanced drilling (UBD): Methodology and Active Tests"

Copied!
2
0
0

Laster.... (Se fulltekst nå)

Last ned nå ( 2 sider )

Fulltekst

(1)

Paper B:

Reservoir Characterization

during underbalanced drilling (UBD): Methodology and

Active Tests

Erlend H. Vefring, SPE, IRIS Petroleum, Gerhard Nygaard, Telemark Uni- versity College, Rolf Johan Lorentzen, Geir Nævdal, SPE and Kjell K˚ are Fjelde, SPE, IRIS Petroleum

This paper (SPE 81634) was first presented at the 2003 SPE Underbal- anced Technology Conference and Exhibition, Houston, 25-26 March, and revised for publication. Original manuscript received for review 26 August 2003. Revised manuscript received 26 May 2005. Paper peer approved 29 November 2005. Published in SPE Journal, Vol. 11, in June 2006.

115

(2)

Reservoir Characterization During Underbalanced Drilling (UBD):

Methodology and Active Tests

Erlend H. Vefring,SPE,Gerhard Nygaard, Rolf Johan Lorentzen, Geir Nævdal,SPE, andKjell Kåre Fjelde,SPE, IRIS

Summary

Two methods for characterizing reservoir pore pressure and res- ervoir permeability during UBD while applying active tests are presented and evaluated. Both methods utilize a fast, dynamic well fluid-flow model that is extended with a transient reservoir model.

Active testing of the well is applied by varying the bottomhole pressure in the well during the drilling operations.

The first method uses the Levenberg-Marquardt optimization algorithm to estimate the reservoir parameters by minimizing the difference between measurements from the drilling process and the corresponding model states. The method is applied after the drill- ing process is finished, using all the recorded measurements. The second method is the ensemble Kalman filter, which simulates the drilling process using the dynamic model while drilling is per- formed, and updates the model states and parameters each time new measurements are available. Measurements that usually are available while drilling are used, such as pump rates, pump pres- sure, bottomhole pressure, and outlet rates.

The methods are applied to different cases, and the results indicate that active tests might improve the estimation results. The results also show that both estimation methods give useful results, and that the ensemble Kalman filter calculates these results during the UB operation.

Larsen and Nilsen (1999) focused on the importance of reser- voir influx prediction while drilling and presented models for cal- culating the inflow based on penetration rate and knowledge of the ratio of vertical-to-horizontal reservoir permeability. The influx predictions using these models were compared to influx predic- tions calculated by a numerical reservoir simulator, giving accept- able results.

A paper by Hunt and Rester (2000) focused on the importance of having a reservoir model that accounts for the change in well length as the drill bit penetrates into the reservoir. They also pre- sented a history-matching method for identifying the reservoir per- meability in a single-layer reservoir. In a followup study, Hunt and

Copyright © 2006 Society of Petroleum Engineers

This paper (SPE 81634) was first presented at the 2003 SPE Underbalanced Technology Conference and Exhibition, Houston, 25–26 March, and revised for publication. Original manuscript received for review 26 August 2003. Revised manuscript received 26 May 2005.

Paper peer approved 29 November 2005.

181 June 2006 SPE Journal

Referanser

Last ned nå ( PDF - 2 sider - 98.05 KB )

RELATERTE DOKUMENTER

1551065

The Water Ice Subsurface Deposit Observation on Mars (WISDOM) ground-penetrating radar has been designed to provide infor- mation about the nature of the shallow subsurface over

08-01915

228 It further claimed that, up till September 2007, “many, if not most, of the acts of suicide terrorism and attacks on the Pakistani Armed Forces since the Pakistan Army's

07-00070

The unilateralist turns in US foreign and security policy, the different interpretations of the fight against international terrorism, and a more self-confident and assertive

13-00131

The system can be implemented as follows: A web-service client runs on the user device, collecting sensor data from the device and input data from the user. The client compiles

08-01463

As part of enhancing the EU’s role in both civilian and military crisis management operations, the EU therefore elaborated on the CMCO concept as an internal measure for

Fast robust optimization using bias correction applied to the mean model

Properties of α and β We randomly select 5 different complete drilling sequences and apply them to the entire ensemble of realizations and the reservoir mean model to obtain the

Paper A: Reservoir Characterization during Underbalanced Drilling: Methodology, Accuracy, and Necessary Data

This paper SPE77530 was presented at the conference and published in the Proceedings of the SPE Annual Technical Conference and Exhibition held in San Antonio, Texas,

The ensemble Kalman filter in bioeconomics

In applying the ensemble Kalman filter, we have demonstrated how relatively simple aggregated biomass models, typical in bioeconomic analysis, can capture much of the dynamics