pore pressureis defined as the pressure of the fluid inside the pore space of the formation, which is also known as the formation pressure. when the pore pressure is higher than hydrostatic pressure, it is referred to as overpressure. knowledge of this pressure is essential for cost-effective drilling, safe well planning, and efficient reservoir modeling. the main objective of this study is to ...

Abstract High-pressure water jets bear a great technological potential to enhance geothermal deep drilling. Compared existing cutting technologies, significantly different operation conditions are encountered under deep-drilling conditions, such as high ambient pressures. The fundamental fluid mechanics affected by those conditions. In this work we examine the influence of increasing pressure u...

Water ice is an important water source in lunar polar soil. Drilling and sampling soil are engineering tasks of exploration. In view the influence temperature rise on quality samples obtained by drilling, heat transfer drilled ice-containing were investigated. this study, a thermal simulation model for drilling was established based discrete element method (DEM). Simulations containing at 3–5% ...

fluid invasion from water-based drilling mud (wbdm) into the shale formations causes swelling,high pressure zone near the wellbore wall, and eventually wellbore instability problems duringdrilling operations. for the stability of the wellbore, physical plugging of nanoscale pore throats couldbe considered as a logical approach toward avoiding the fluid invasion into the shale formation. thispap...

This research is about 1D geomechanical model for wellbore stability in Z Field, Y Well Sanga Working Area, Kutai Basin where wells have been drilled. The Purpose of this Research to analyze the well starting from knowing stress regime that occurs, predicting occurrence failure, and determining safe mud weight window next drilling. method use a numerical modelling using log data drilling has ob...

[1] Single-hole hydrogeologic experiments were conducted with a drillstring packer in Integrated Ocean Drilling Program Hole 1301B, which penetrates 318 m into 3.5-Ma upper oceanic basement on the eastern flank of the Juan de Fuca Ridge. Seven constant-rate injection tests were conducted in open hole, with the packer inflated at three depths in the deepest 166 m of the basement section. The pri...

In a study of a sediment core from the US Atlantic Coastal Plain (Ocean Drilling Program Site 174X-Millville), Wright and Schal-ler (1) claim to have resolved the onset of the Paleocene/Eocene carbon isotope excursion (CIE) across 13 y. Such a rapid change would require an enormous and instantaneous release of isotopically light carbon into the ocean/atmosphere, implicating comet impact. The cl...

Drilling engineering is important for development of underground resources. There are many potential risks in the process drilling engineering. If safety not effectively managed, it will lead to great loss. In order predicate and prevent accidents, a evaluation index system established an AHP-ACE method proposed. 23 groups original data collected from block Xinjiang oil field, levels quantitati...

The article provides information on the causes of drilling fluid absorption and research conducted during its absorption. It is known that some complications arise when a well. One them loss circulation. Absorption mainly depends several factors. main factors depend condition well, geological structure correctness processes performed drilling. Also, another factor has an effect, which type flui...