Underbalanced Drilling with Coiled Tubing

Matanovi, Davorin; Meimurec, Nediljka Gaurina; Krištafor, Zdenko

doi:10.2118/87242-ms

Cited by 4 publications

(1 citation statement)

References 10 publications

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“…Now, there are two protecting methods, one is adding protecting reagent into gas reservoirs, the other is under-balanced drilling. Results indicate that under-balanced drilling can effectively protect gas reservoirs with low porosity and permeability [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] .…”

Section: Studying the Response Differences Between Neutron And Densitmentioning

confidence: 99%

Neutron and density logging responses to gas reservoir for well-balanced and under-balanced logging: Gas reservoirs of sandstone in a western China field

Xiao

Zhang

2008

Sci. China Ser. D-Earth Sci.

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Studying the response differences between neutron and density logging of gas reservoir for wellbalanced and under-balanced logging will be of significance in evaluation of gas reservoir under the under-balanced condition and application of logging data. With Monte Carlo simulation technique, the paper obtains the relationship between neutron and density logging measurement and borehole diameter, porosity or gas saturation for well-balanced and under-balanced logging. The conclusions show that the response trend of under-balanced logging to gas reservoirs agrees with that of well-balanced logging with small borehole, and under-balanced logging data can be used usually as well-balanced logging data. When borehole diameter is large, under-balanced logging data should be corrected for the influences of borehole.under-balanced logging, density logging, neutron logging, gas reservoir, response Gas reservoirs of sandstone, which have low porosity and permeability, are contaminated easily by drilling fluid, and their slim filtering channels such as pore and throat are jammed. Thus, some measures should be taken to prevent gas reservoirs from being contaminated. Now, there are two protecting methods, one is adding protecting reagent into gas reservoirs, the other is under-balanced drilling. Results indicate that under-balanced drilling can effectively protect gas reservoirs with low porosity and permeability [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] .Under-balanced logging is carried out when formation pressure is higher than that of mud column. Under-balanced drilling and logging can protect the gas reservoirs with low porosity and permeability. Under-balanced logging data, which is affected certainly by logging physical property, borehole condition, working condition and so on, should be compared with that of well-balanced logging before it is used to evaluate reservoirs.With Monte Carlo simulation program MCNP [19] , the paper compares density and neutron logging responses of under-balanced condition with those of well-balanced condition for gas reservoirs with low porosity and permeability in a field located in western China.

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Section: Studying the Response Differences Between Neutron And Densitmentioning

confidence: 99%

Neutron and density logging responses to gas reservoir for well-balanced and under-balanced logging: Gas reservoirs of sandstone in a western China field

Xiao

Zhang

2008

Sci. China Ser. D-Earth Sci.

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Solids Control in Underbalanced Drilling

Rehm¹,

Haston²

2005

Drilling Fluids Processing Handbook

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Worldwide First Successful Production Logging of Tri-Lateral High Temperature Coiled Tubing Drilled Sour Gas Well, Performed in a Single Run Using Innovative Reentrance System Without Whipstock Guides

Saeed

Hamid

Yakovlev³

et al. 2020

Day 2 Wed, March 25, 2020

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The job results from an operation using a wireline-operated lateral access tool (LAT) with a production logging tool (PLT) on E-coil are presented. The objective was to successfully identify, enter and acquire production data in each of the openhole laterals as well as the main borehole in order to quantify production and identify any cross-flow. This operation is enabled by the use of a wireline-operated LAT. The tool can identify where the lateral window is located in the well and provide orientation data. With the LAT, the bottom sub can be indexed to enable entry into the lateral, while sensors package would provide positive confirmation and identification of a particular, targeted lateral. The system is compatible with a number of mono-cable logging tools and can be deployed using both E-line as well as Coiled Tubing. This paper describes the operation in detail and discusses the output and evaluates the results, which demonstrate the efficiency and accuracy of finding and entering the laterals. The operation was conducted on a well in Saudi Arabia which was drilled using underbalanced coiled tubing drilling (UBCTD) technique in 2013 and included three, slim openhole laterals. In early 2014, the well was put on production with unknown contribution from each of the lateral sections, but interlateral cross-flow was suspected, leading to the need for intervention. A number of approaches were considered with special consideration given to a new technology that had been developed locally and run with success on some other oil and water wells in the region. This technology had not been utilized previously in slim openhole wells with predominantly gas production. Challenges were anticipated regarding how some of the sensors would perform over two critical areas: identification of the lateral windows and confirmation that the lateral had in fact been entered successfully. The results of this operation demonstrate that the sensors can operate successfully in this environment. The operator was able to acquire critical reservoir information about each of the openhole laterals as well as the main bore, enabling further understanding of well production and reservoir depletion efficiency. This case study demonstrates the innovative application of LAT to enable the production logging (PLT) and evaluation of slim openhole laterals in a gas well drilled with UBCTD compared to previous cases which were predominantly oil producers and water injectors.

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Underbalanced Drilling with Coiled Tubing

Cited by 4 publications

References 10 publications

Neutron and density logging responses to gas reservoir for well-balanced and under-balanced logging: Gas reservoirs of sandstone in a western China field

Neutron and density logging responses to gas reservoir for well-balanced and under-balanced logging: Gas reservoirs of sandstone in a western China field

Solids Control in Underbalanced Drilling

Worldwide First Successful Production Logging of Tri-Lateral High Temperature Coiled Tubing Drilled Sour Gas Well, Performed in a Single Run Using Innovative Reentrance System Without Whipstock Guides

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