A Case History of Polycrystalline Diamond Compact Bit Performance in the Tuscaloosa Trend

Moore, Steven O.; Lynch, B.W.; Talbot, K.J.

doi:10.2118/11944-ms

Cited by 7 publications

(1 citation statement)

References 7 publications

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“…The number of bits run has decreased significantly due to better bearing packages, cutting structure and the resulting increase in rate of penetration. PDC bits were first applied in 1980 7 . Now rock bits are the exception.…”

Section: Current Drilling Systemsmentioning

confidence: 99%

20-Plus Years of Tuscaloosa Drilling: Continuously Optimizing Deep HTHP Wells

Shaughnessy¹,

Locke²

2000

Proceedings of IADC/SPE Drilling Conference

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fax 01-972-952-9435. AbstractDrilling the Tuscaloosa formation in Louisiana was as challenging as any area drillers worked 20 years ago. It was one of the most active areas in the U.S. Problems that were new at the time such as gas solubility in oil base mud, sulfide stress cracking of tubulars, pressure regressions and low margins between the fracture pressure and pore pressures resulted in numerous well control problems and high cost wells. Activity decreased in the mid 80's when the gas price did not encourage operators to challenge the drilling risks. BP Amoco is still successfully drilling to 22,000' into to 16,000 psi, 380°F reservoirs that are now depleted over 10,000 psi. This paper will address steps taken to optimize the drilling operation and continue making the wells economical. First, drilling problems such as stuck pipe, lost returns, drill string failures and well control had to be minimized. Next, successful cement jobs were required and have resulted in the highest rate completions in the history of the Trend. All objectives had to be achieved in a safe manner with little impact on the environment.

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Section: Current Drilling Systemsmentioning

confidence: 99%

20-Plus Years of Tuscaloosa Drilling: Continuously Optimizing Deep HTHP Wells

Shaughnessy¹,

Locke²

2000

Proceedings of IADC/SPE Drilling Conference

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Investigations on the influence of rock and machine characteristics on coring rates in vertical and mildly inclined exploration drilling in complex coal bearing rock formation

Alam¹,

Raina²,

Murthy

2021

Geomech. Geophys. Geo-energ. Geo-resour.

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Resource characterization and modelling are important in exploration wherein cores of rock are extracted from the surface. Such cores not only help to assess the quantity and quality of the mineral or ore but also provide means to establish an excavation and ground control regime for different types of mining. Prediction of coring rate assumes critical importance for planning the coal mines which have fragile nature of ground posing challenges in strata control and excavation performance. Coring rate or associated rock factors characterize the rockmass to help in this regard. In line with the above need, the geological and machine performance data of two representative boreholes drilled at 90°and 80°in a complex coal bearing strata were collected covering drill machine variables, penetration rates and physico-mechanical properties of the rock cores in laboratory. The penetration rate showed significant deviation up to a depth of 250 m from the surface in both the holes. The variation in penetration rate was 28% in basalt and 38% in mudstone, 16% in sandy shale with coal, 10% in sandy shale and -2% in medium to coarse grained sandstone. In order to model the penetration rate, a rock designation factor was devised in terms of the depth, tensile strength and density of the rockmass. The rock designation factor along with other machine variables were analyzed initially using PCA enabled Gaussian progression method which helped in model refinement and selection of best variables. Subsequently, response surface analysis of selected variables viz., rock designation factor, torque, drill fluid pressure and RPM, using multivariate non-linear ANOVA with backpropagation method to develop a penetration rate model. Drill angle and rock type were retained as categorial factors. The model thus devised was evaluated using various techniques and resulted in RMSE of 8.1, MAE of 5.59, MSE of 65.61 with predicted R 2 of 0.927. The intercepts for different rocks analyzed were thus enumerated. The model developed can be used for defining penetration rates for the type of drill investigated. Explicit surface response with variations in different variables could thus be defined along with the relative sensitivity of the variables entering into the interaction with perturbation method. Also, a variation of 50 mm/min in penetration rates in 90°and 80°drilling is accounted by the model. The penetration

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The Effect of Bit Hydraulics on Bit Performance in Relation to the Rock Destruction Mechanism at Depth

Feenstra

Zijsling

1984

SPE Annual Technical Conference and Exhibition

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Bit hydraulics can contribute to a bit's performance by one or more of the following actions: *reduction of chip holddown*jet cutting*reduction of bottom balling*reduction of bit balling*transport of cuttings towards the annulus. How and to what extent bit hydraulics can help to improve bit performance is mainly determined by the bit's cutters (teeth, inserts, diamonds, PDCs, jets), the drilling fluid and the formation drilled under downhole conditions. The introduction of a self-cleaning bit strainer and self-cleaning bit cutters widens the scope of bit hydraulics, particularly for PDC-type bits.

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A Case History of Polycrystalline Diamond Compact Bit Performance in the Tuscaloosa Trend

Cited by 7 publications

References 7 publications

20-Plus Years of Tuscaloosa Drilling: Continuously Optimizing Deep HTHP Wells

20-Plus Years of Tuscaloosa Drilling: Continuously Optimizing Deep HTHP Wells

Investigations on the influence of rock and machine characteristics on coring rates in vertical and mildly inclined exploration drilling in complex coal bearing rock formation

The Effect of Bit Hydraulics on Bit Performance in Relation to the Rock Destruction Mechanism at Depth

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