... ABSTRACT Severe lost circulation in fractured formations is one of the most common and challenging problems in oil and gas drilling engineering. The lack of theoretical guidance on the selection of lost circulation materials (LCMs) for millimeter-level fractures results in unstable fracture...

... geological subdiscipline drilling fluid chemistry drilling fluid management & disposal machine learning clastic rock united states government rock type artificial intelligence reservoir geomechanics fracture barite field stress fip circulation null null null wellbore pressure particle...

... united states government geologist asia government geology upstream oil & gas deep learning artificial intelligence china government mechanism circulation classification input feature interpretability artificial neural network accuracy halstm model drilling operation...

... leakage reservoir geomechanics fracture formation mizhi block liujiagou formation changqing mizhi block drilling fluid chemistry shihezi formation petro china changqing oilfield company shiqianfeng formation loss circulation material mudstone wellbore reservoir characterization circulation...

... ABSTRACT: Wellbore instability is one of the difficult problems restricting safe drilling. The traditional theoretical model of wellbore stability is easy to cause the actual drilling fluid density to be high and aggravate the risk of drilling lost circulation. Therefore, firstly, the rock...

.... Geng, Z., Wang, H., Fan, M., Lu, Y., Nie, Z., Ding, Y., and Chen, M. (2019). Predicting seismic-based risk of lost circulation using machine learning. J. Pet. Sci. Eng., 176: 679-688. 7. Gulbransen, A. F., Hauge, V. L., and Lie, K. A. (2010). A multiscale mixed finite-element method for vuggy...

... activities. During a drilling campaign in semi-consolidated deepwater clastics, a generic link between faults, fluid loss events, fluid circulation pressure and the fault strength parameters was established. In order to reduce the risks of fault-induced fluid loss along any proposed well path in future...

...ARMA 22 156 Studies on Lost Circulation Risk of Deep Shale Formation Based on Fracture Prediction and Rock Mechanical Properties Bo Wen PetroChina Southwest Oil&Gasfield Company, Chengdu, China Yuan Wang, Gang Chen CNPC Engineering Technology R&D Company Limited, Beijing, China Peiyu Zhang...

... ABSTRACT: Bohai A Oilfield is a fractured oil and gas field, and the lost circulation problems in the non-reservoir and the reservoir are severe during the drilling process. The vicious lost circulation problem in the A Oilfield is characterized by the suddenness of the lost circulation event...

... ABSTRACT: This paper strives to model and validate annulus fluid and casing temperature profiles during wellbore warmback after fluid circulations. Modeling is based on published analytical methods. A research test well has been drilled to a predefined temperature target which can help...

... ABSTRACT: Heat exchange and energy extraction from a low-permeability reservoir are important processes for EGS design. Cold water is circulated from a wellbore and carries warmer water up to the surface. Depending on the circulation velocity and temperature out to the surface, different...

..., normally, several variables are studied or inability to lower it downhole, rotate it, or circulate. In experimentally to show the influences on hole cleaning other words, as long as the drill string cannot be pulled (Khatibi et al., 2018; Naganawa et al., 2002; Ozbayoglu out of the hole with the maximum...

... ABSTRACT: Lost circulation is a unique challenge unlike other factors contributing to non-productive time (NPT). Due to the variability in the nature and type of lost circulation prone formations; there is no universal solution to this challenge. This publication presents a novel approach...

... ABSTRACT: Geothermal energy production by water circulation in natural and/or man-made fracture systems is referred to as enhanced or engineered geothermal systems (EGS). Good understanding of the induced fracture properties is essential for estimating /evaluating the performance...

... ABSTRACT: Geothermal energy from naturally or hydraulically fractured reservoirs is extracted by cold water injection and circulation using injection and production wells. Well spacing, well pattern, and injection-extraction rate schedule are among the most important factors that control...

.... It was discovered that (1) the bitumen in the reservoir near the well pairs will have changed from an immobile solid/semisolid to fluid state at the end of circulation. The temperature propagation speed is very fast in the fusion zone, but shows a slow tendency in the solid zone; (2) The deformation upon preheating...

... ABSTRACT: The machine learning method in artificial intelligence is widely applied in various fields. In this study, three typical Imachine-learning algorithms are employed to mine and analyze drilling data of earlier drilled wells of an oilfield in Iraq where lost circulation is severe...

... ABSTRACT: Lost circulation is a challenging problem particularly in the Dammam formation of the South Rumaila Field, Iraq. Drilling engineers are challenged to select the optimum value for key drilling parameters such as ECD, Yp, MW, WOB, ROP and RPM to mitigate mud losses in this zone. Many...

... ABSTRACT: The one of the biggest risks, when drilling in the naturally fractured formation, is the lost circulation that could result in wellbore instability. This risk is mainly caused by natural fracture propagating. Therefore, drilling fluid with solid plugging materials is used to plug...

... ABSTRACT: Lost circulation, a major challenge in well construction, is the loss of drilling fluid into formation caused by wellbore hydraulic fracturing. Wellbore strengthening techniques can be applied to mitigate lost circulation by generating resistance to the growth of induced or natural...