Dual Subsea Choke Applications for High-Pressure Reservoir Development

Meng, Wei; Prescott, C.N.

doi:10.2523/108432-ms

Cited by 2 publications

(1 citation statement)

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“…In oil exploration, the underground environment is complex. In order to verify the lithology, the corresponding tools, equipment, and drilling fluid properties must be cooperated to sample the rocks so as to determine the properties of the rocks in the formation and understand the mineral conditions of the formation [2,3,4,5]. Nevertheless, the debris generated during the drilling process of the conventional PDC bits is in the powder form and too small for formation identification; thus, different types of bits are required to meet the demand of full drilling and coring [6,7,8].…”

Section: Introductionmentioning

confidence: 99%

Unit Experimental Study on Impact Crushing Rock of the Microcoring PDC Bit

Yang

Song

Huang

et al. 2019

Shock and Vibration

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In light of the situation of sliced or powdery cuttings produced by conventional PDC bit, it is found that they are not convenient for geological logging and stratification. The unit crushing experiment which contains two breaking forms (static-pressure breaking and impact) is conducted on core columns of sandstone, limestone, and granite. This experimental study showed the following: The breaking work ratio of the three core column types is much less than that of the flat rock. The height of the core column has little effect on the bit penetration rate, while core column diameter has greater effect on the bit penetration rate. The experimental results further indicate that a core column has been generated in the central area of the drill bit, which is beneficial to the volume breaking of the rock and can improve the rock-breaking efficiency of the drill bit. The microcoring bit is suitable for raising speed in soft, medium, and hard formations and is helpful for geological logging.

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Section: Introductionmentioning

confidence: 99%

Unit Experimental Study on Impact Crushing Rock of the Microcoring PDC Bit

Yang

Song

Huang

et al. 2019

Shock and Vibration

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Drilling to the Extreme: The Micro-Coring Bit Concept

Deschamps

Desmette

Delwiche

et al. 2008

IADC/SPE Asia Pacific Drilling Technology Conference and Exhibition

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The growing interest in deeply buried reservoirs increasingly leads operators into extreme drilling conditions characterized by high hydrostatic pressure (over 20.000 psi) and high temperatures (over 300 °F), combined with hard formations (high CCS-40,000+ psi). Drilling in such environments requires specific adaptations of well design and in equipment selection. Additionally, these wells present multiple issues in well control, drilling and completion operations, and make the entire operation technically more complex and financially more risky.Referencing the specific example of drilling operations, the great depths and increased formation compaction leads to very low rates of penetration (ROP) and considerably extended operation time. These low ROPs equate to low depth of cut, and as a direct consequence the typical size of the drilled cuttings recovered at the shakers is extremely low (0.020 to 0.20 mm). This makes the cuttings irrelevant for the purpose of geological identification of the formations. This situation occurs with both impregnated diamond and PDC drill bits in these applications at low ROPs. If the downhole conditions (HPHT) exceed the MWD or LWD specifications, accessing critical geological information will necessarily require a challenging coring job, dramatically increasing the operation time and thus the cost of the well.

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Dual Subsea Choke Applications for High-Pressure Reservoir Development

Cited by 2 publications

References 0 publications

Unit Experimental Study on Impact Crushing Rock of the Microcoring PDC Bit

Unit Experimental Study on Impact Crushing Rock of the Microcoring PDC Bit

Drilling to the Extreme: The Micro-Coring Bit Concept

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