Abstract Tremendous amounts of hydrocarbons are located in deeper formations, such as Tarim basin China, some reservoirs buried so deeply (>7600m) that we experience higher temperature (>180°C) and pressure (>180MPa). And the drilling fluids rheological properties often affected by HTHP, careful research on at HTHP is very important for precisely predicting ECD well controlling bottomhole pressure. An accurate prediction methodology was formulated, which can accurately...

The formation of a rich underground-seam network is the key problem in development low-permeability hot dry rock (HDR) resources. Considering lack macroscopic continuum theory to study hydraulic fracturing having preset fracture-interface element, particle-flow method micro-mechanical discrete-element introduced simulate mechanical behavior for HDR low permeability reservoirs. reservoir simulated as round particle; fluid movement described by seepage field equation, and displacement...

Abstract This article considers the influence of flow-induced vibrations on gas-filled tubing system used in high-pressure gas wells, adopts fluid–structure interaction four-equation model, combined with data field example well, and utilizes method characteristics to simulate string response valve-closure transient excitation at wellhead. The simulation results show that alternating stress reciprocating motion, caused by natural flow, aggravate fatigue failure, leakage, wear damage....

In the process of drilling, strong vibration and rapid rotation bottom drilling tools lead to multi-frequency high-amplitude interference signals in attitude measurement signals. The problems weak original signal amplitude very low signal-to-noise ratio are always technical difficulties field while-drilling measurement. To solve this problem, a Duffing chaotic system detection method suitable for recognition while is proposed paper. Firstly, frequency reconstruction downhole realized by...

As an unconventional, high-quality, efficient, and clean low-carbon energy, shale gas has become a new bright spot in the exploration development of global oil resources. However, with increasing recent years, anisotropic load reservoir during mining process caused casing to be deformed or damaged more seriously. In this paper, mechanical behavior core shear, triaxial radial compression are studied using rock true tests, shear tests nuclear magnetic resonance (NMR) technology. The...

Abstract The dynamic kill process is divided into two stages: “dynamic pressure stability” and “static stage in this paper. In stability stage, sea water fluid was pumped the well initial killing fluid; Then pump weight liquid by quantified displacement based on that can achieve complete effect, control kick effectively to drill efficiency. paper, multiphase multicomponent staged equation established considering effect of shallow flow gas influx, meanwhile, it adopts auxiliary equations such...

The purpose of this research is to enhance the ability data analysis and knowledge mining in soil corrosion factors pipeline. According its multifactor characteristics, rough set algorithm directly used analyze process observation without considering any prior information. We apply delete duplicate same information redundant items simplify condition attributes decision indicators from table. Combined with simplified index, tree method root node branch it, model constructed. With Python...

In this paper, a comprehensive model to calculate the rock fracture pressure by theory of double effective stress porous medium is established, which considers such factors as crustal field, hydration temperature tectonic porosity rock, and additional field generated seepage drilling fluid. This new applicable predict different types rocks. Using experimental parameters fracturing results three-axis compression cores with water contents, we may get calculated pressure. Compared measured in...

The expressway green channel is an essential transportation policy for moving fresh agricultural products in China. In order to extract knowledge from various records, this study presents a cutting-edge approach information textual records of failure cases the vertical field channel. We proposed hybrid based on BIO labeling, pre-trained model, deep learning and CRF build named entity recognition (NER) model with optimal prediction performance. Eight entities are designed NER processing three...

Abstract Hydraulics play an important function in many oil field operations, the case of drilling, with implementation and promotion management pressure drilling technology, role accurate hydraulic parameter predictions becomes vital for drilling. This paper describes a utility calculation model Herschel-Bulkley (H-B) rheological model. Firstly, explicit equation between wall shear stress volumetric flow rate H-B fluid pipe annuli were obtained. Then, numerical solutions both Secondly, we...

The purpose of this research is to improve the analysis grade evaluation soil corrosion rate for pipeline. With characteristics existing mathematical models and factors pipeline corrosion, a combined model rough set, decision tree support vector machine (RS-DT-SVM) proposed evaluate This method utilizes set (RS) (DT) manage by standardization data in early stage. According solving problems over learning, local minima, nonlinearity dimension disaster, (SVM) used build intelligent corrosion....

Based on the acoustic wave finite element (AWFE) method, one can establish an AWFE method and study influence of mechanical parameters shale reservoir propagation characteristics. The different crack characteristics multi-physical coupling phenomena are studied by using gas cracks. To calculate shape position along near a side borehole, model compared with simulation results. reflection waveform adjacent cracks method. By considering borehole axis symmetry, for impedance discontinuous...

Abstract Deepwater, HTHP and narrow pressure-margin well depend on accurate, real-time knowledge of down hole hydraulics in order to their objectives safely economically. A comprehensive methodology calculating hydraulic parameters the basis logging data was formulated. It can conduct a monitoring using process drilling. First, according problem non-unified units mode sharing, transmission during transmission, an integrated new site software module developed, which combined functions...

Multistage fracturing is the main means of shale gas development, and casing deformation frequently occurs during horizontal wells. Fracturing fluid entering formation will change in situ stress nearby wellbore. The changes are mainly reflected following two aspects: one increase other nonuniformity along And it for this reason that production more likely to collapse under nonuniform load. According service conditions reservoir, paper studied collapsing strength subjected loading by...

In this paper, we set up a model for calculating the shale fracture pressure on basis of Huang’s by theory elastic-plastic mechanics, rock mechanics and application maximum tensile stress criterion, which takes into account such factors as crustal field, chemical temperature tectonic porosity seepage drilling fluid so on. Combined with experimental data field fracturing results three axis compression core different water contents, show that error between present study measured value is...

The purpose of this research is to enhance the analysis reliability status for external anticorrosive coatings. With limitation and insufficiency static evaluation method, we study construct an method dynamic layer, integrating trend Markov chain set pair theory. This implemented by machine learning software PyCharm community edition, based on Python language. algorithm utilizes connection degree in theory determine risk levels coating systems. According characteristics change layer with...

With the application of complex fracturing and other technologies, external extrusion has become main cause casing damage, which makes non-API high-extrusion-resistant continuously used in unconventional oil gas resources exploitation. Due to strong sensitivity string ovality, uneven wall thickness, residual stress, factors high anti-collapse casing, API formula a big error predicting strength casing. Therefore, Bayesian regularization artificial neural network (BRANN) is predict collapse By...

Abstract The analysis of string stability affected by earthquake in the shallow deepwater drilling In drilling, wellhead, catheter, surface casing system and riser are linked together, they show characteristic instability under influence wave force. Some scholars have already done some research on this topic, however, sea is an area with frequent earthquake. Especially active seismic zone, oil gas often accompanied earthquake, so it crucially important to study forces deep-water catheter...

Abstract With the oil and gas exploration development in deep formation number of wells grow continually, ROP decreases greatly cost drilling operation increases rapidly. A comprehensive procedure optimization hydraulic design for improving was formulated. It can conduct integrated hydraulics to improve not only during making design, but also generate recommendations process based on real-time situation. First, this paper presents a mathematical analysis (Bit pressure drop, bit specific...

With the increasing complexity of shale gas extraction conditions, a large number high-strength collapse-resistant casing is applied to unconventional oil and resources. There are errors in traditional API collapse strength formula. A high-precision low-computational-cost model needed for predicting high-collapsible casing. The key influencing factors anti-collapse were determined as outer diameter, wall thickness, yield strength, ovality, thickness unevenness, residual stress by analyzing...