Status and Influence of Shale Gas Well Integrity Failure

2019 ◽  
Vol 944 ◽  
pp. 892-897
Author(s):  
Wen Bao Zhai ◽  
Jun Li ◽  
Yan Xi ◽  
Gong Hui Liu ◽  
Ying Сao Zhou
Keyword(s):  
Failure Mechanism ◽  
Shale Gas ◽  
Structural Integrity ◽  
Oil And Gas ◽  
Gas Production ◽  
Control Methods ◽  
Gas Well ◽  
Seal Integrity ◽  
Well Integrity ◽  
At Home

The well integrity issues in oil and gas wells have a long history, especially in the shale gas development, which has a direct impact on improving single well production of shale gas horizontal wells. Reviewing the domestic and foreign literature researches, the development status of major shale gas blocks at home and abroad were introduced. Well integrity failure characteristics of major shale gas blocks at home and abroad were counted and analyzed in detail. Finally, considering the shale gas development blocks in China as an example, the structural integrity (casing deformation) and seal integrity (Sustained Casing/Annulus pressure, SCP/SAP) were analyzed by clarifying the failure mechanism that well integrity issues affected shale gas production and that shale gas well integrity issues in China are a new problem was thought. The failure mechanism of shale gas well integrity needs to be further clarified, and a complete set of failure prediction and control methods has not yet been formed. Therefore, based on the concept of shale gas geology-engineering integration, taking into account the actual conditions of shale gas development blocks, it is proposed to scientifically and reasonably study shale gas well integrity failure mechanisms and their control methods, which has a reference and guidance to improve shale gas development.

Structural Integrity System Based on an Object-Oriented Activity- and Product Model

1993 ◽  
Author(s):  
Morten Lovstad ◽  
Tor G. Syvertsen
Keyword(s):  
Computational Models ◽  
Structural Integrity ◽  
Oil And Gas ◽  
Physical Structure ◽  
Gas Production ◽  
Structural Safety ◽  
Actual State ◽  
Product Model ◽  
The North ◽  
Analysis Models

Abstract Huge steel or reinforced concrete structures in deep waters support the installations for oil and gas production in the North Sea. Steady operations in a hostile environment require that structural safety and integrity is maintained. For rapid evaluation and assessment of structural integrity in case of modifications or urgency situations, Structural Integrity Systems are established, comprising computational models and structural analysis programs. A major problem for structural assessment at short notice is to keep the analysis models updated and consistent with the actual state of the physical structure and the loadings. This paper proposes a layered approach for model integration, which enable maintenance of the models at a high level, from which detailed analysis models are derived in a consistent manner.

Laboratory-Scale Investigation of the Utilisation of Multiple Flat-Fan Nozzles in Descaling Petroleum Production Tubing

2021 ◽  
Author(s):  
Kabir Hasan Yar'Adua ◽  
Idoko Job John ◽  
Abubakar Jibril Abbas ◽  
Salihu M. Suleiman ◽  
Abdullahi A. Ahmadu ◽  
...  
Keyword(s):  
High Pressure ◽  
Oil And Gas ◽  
Gas Production ◽  
Oil And Gas Production ◽  
Scale Removal ◽  
Petroleum Production ◽  
Well Completion ◽  
Water Jets ◽  
Well Integrity ◽  
Injection Pressures

Abstract Despite the recent wide embrace of mechanical descaling approaches for cleaning scales in petroleum production tubings and similar conduits with the use of high-pressure (HP) water jets, the process is still associated with downhole backpressure and well integrity challenges. While the introduction of sterling beads to replace sand particles in the water recorded high successes in maintaining well completion integrity after scale removal in some recent applications of this technique, it is, unfortunately, still not without questions of environmental degradation. Furthermore, the single nozzle, solids-free, aerated jetting descaling technique – recently published widely – is categorized with low scale surface area of contact, low descaling efficiency and subsequent high descaling rig time. The modifications to mechanical descaling techniques proposed in this work involve the use of three high-pressure flat fan nozzles of varying nozzles arrangements, standoff distances and injection pressures to remove soft scale deposits in oil and gas production tubings and similar circular conduits. This experiment provides further insights into the removal of paraffin scales of various shapes at different descaling conditions of injection pressures, stand-off distances and nozzle arrangements with the use of freshwater. The results obtained from this study also show consistency with findings from earlier works on the same subject.

Horizontal well of Shale Gas Complex Fracturing Casing Failure Mechanism

2019 ◽  
Vol 944 ◽  
pp. 898-902
Author(s):  
Shang Yu Yang ◽  
Jian Jun Wang ◽  
Guang Xi Liu ◽  
Li Hong Han
Keyword(s):  
Failure Mechanism ◽  
Shale Gas ◽  
Equivalent Stress ◽  
Great Influence ◽  
Distribution Law ◽  
Gas Well ◽  
Fracturing Process ◽  
Variable Function ◽  
Maximum Equivalent Stress ◽  
Casing Deformation

Shale gas well casing deformation failure is extremely serious in complex fracturing process. Based on the elastic mechanics theory, the distribution law of casing’s maximum equivalent stress field with the non uniform external extrusion is calculated by the complex variable function method. Meanwhile, casing deformation failure mechanism with non uniform external extrusion is revealed. For another, the maximum equivalent stress of the casing is analyzed with the case of a/b=2 and a/b=5. The result shows that the unevenness of the extrusion load has a great influence on the casing maximum equivalent stress distribution. The findings provide technical support for casing design and selection in complex fracturing process of shale gas well. Keywords: shale gas well; complex fracturing; casing formation; failure mechanism

Study on Failure Mechanism of Cement Sheath Sealing of Shale Gas Well Under Alternating Loading and the Controlling Method

2019 ◽  
Author(s):  
Shiming Zhou ◽  
Rengguang Liu ◽  
Qiani Tao ◽  
Peiqing Lu ◽  
Xiaojiang Li
Keyword(s):  
Failure Mechanism ◽  
Shale Gas ◽  
Gas Well ◽  
Cement Sheath

scholarly journals What Factors Control Shale-Gas Production and Production-Decline Trend in Fractured Systems: A Comprehensive Analysis and Investigation

SPE Journal ◽  
2016 ◽  
Vol 22 (02) ◽  
pp. 562-581 ◽  
Author(s):  
HanYi Wang
Keyword(s):  
Shale Gas ◽  
Gas Production ◽  
Reservoir Model ◽  
Reservoir Properties ◽  
Gas Reservoir ◽  
Gas Well ◽  
Field Development ◽  
Shale Gas Reservoir ◽  
Decline Curve ◽  
Realistic Prediction

Summary One of the most-significant practical problems with the optimization of shale-gas-stimulation design is estimating post-fracture production rate, production decline, and ultimate recovery. Without a realistic prediction of the production-decline trend resulting from a given completion and given reservoir properties, it is impossible to evaluate the economic viability of producing natural gas from shale plays. Traditionally, decline-curve analysis (DCA) is commonly used to predict gas production and its decline trend to determine the estimated ultimate recovery (EUR), but its analysis cannot be used to analyze which factors influence the production-decline trend because of a lack of the underlying support of physics, which makes it difficult to guide completion designs or optimize field development. This study presents a unified shale-gas-reservoir model, which incorporates real-gas transport, nanoflow mechanisms, and geomechanics into a fractured-shale system. This model is used to predict shale-gas production under different reservoir scenarios and investigate which factors control its decline trend. The results and analysis presented in the article provide us with a better understanding of gas production and decline mechanisms in a shale-gas well with certain conditions of the reservoir characteristics. More-in-depth knowledge regarding the effects of factors controlling the behavior of the gas production can help us develop more-reliable models to forecast shale-gas-decline trend and ultimate recovery. This article also reveals that some commonly held beliefs may sound reasonable to infer the production-decline trend, but may not be true in a coupled reservoir system in reality.

On Determination of Acceptable Safety Class in Design of Pipe-In-Pipe (PIP) Systems

2014 ◽  
Author(s):  
Soheil Manouchehri ◽  
Guillaume Hardouin ◽  
David Kaye ◽  
Jason Potter
Keyword(s):  
Failure Modes ◽  
Structural Integrity ◽  
Oil And Gas ◽  
Gas Production ◽  
Point Of View ◽  
Insulation Material ◽  
Limit States ◽  
Oil And Gas Production ◽  
Operational Conditions ◽  
Outer Pipe

Pipe-In-Pipe (PIP) systems are increasingly used in subsea oil and gas production where a low Overall Heat Transfer Coefficient (OHTC) is required. A PIP system is primarily composed of an insulated inner pipe which carries the production fluid and an outer pipe that protects the insulation material from the seawater environment. This provides a dry environment within the annulus and therefore allows the use of high quality dry insulation system. In addition, from a safety point of view, it provides additional structural integrity and a protective barrier which safeguards the pipeline from loss of containment to the environment. Genesis has designed a number of PIP systems in accordance with the recognized subsea pipeline design codes including DNV-OS-F101 [1]. In section 13 F100 of the 2013 revision, a short section has been included in which PIP systems are discussed and overall design requirements for such systems are provided. It has also been stated that the inner and outer pipes need to have the same Safety Class (SC) unless it can be documented otherwise. This paper looks at the selection of appropriate SC for the outer pipe in a design of PIP systems based on an assessment of different limit states, associated failure modes and consequences. Firstly, the fundamentals of selecting an acceptable SC for a PIP system are discussed. Then, different limit states and most probable failure modes that might occur under operational conditions are examined (in accordance with the requirements of [1]) and conclusions are presented and discussed. It is concluded that the SC of the outer pipe of a PIP system may be lower than that of the inner pipe, depending on the failure mode and approach adopted by the designer.

The impacts of microcosmic flow in nanoscale shale matrix pores on the gas production of a hydraulically fractured shale-gas well

2016 ◽  
Vol 29 ◽  
pp. 431-439 ◽  
Author(s):  
Jinzhou Zhao ◽  
Zhiqiang Li ◽  
Yongquan Hu ◽  
Lan Ren ◽  
Zhengwu Tao
Keyword(s):  
Shale Gas ◽  
Gas Production ◽  
Gas Well

scholarly journals Shale Gas Production in the Post-Soviet Countries: First Results and Problems

2018 ◽  
Vol 5 (3) ◽  
pp. 236-250
Author(s):  
S. S. Zhiltsov ◽  
I. S. Zonn
Keyword(s):  
Shale Gas ◽  
Oil And Gas ◽  
Objective Assessment ◽  
Gas Production ◽  
Hydrocarbon Resource ◽  
The People ◽  
First Results ◽  
Political Dimensions ◽  
Gas Market ◽  
The One

This chapter considers the approaches and possibilities of exploration and use of shale gas in the countries of the former USSR. Many of them became interested in the results of the US “shale revolution” which opened the new stage in gas production. Some post-Soviet countries are eager by using shale gas to reduce their dependence on external deliveries, thus, attaining energy independence.The data on shale gas reserves in the post-Soviet countries are taken together; the preliminary results of energy policy in these countries concerning development of the shale gas deposits are presented; the first results of oil and gas company activities are analyzed.Of all post-Soviet countries, Ukraine was most active in this respect having declared about possessing the greatest shale gas reserves. Ukraine invited foreign oil and gas companies which showed interest in the shale deposits. But the shale gas production in Ukraine acquired political dimensions impeding the objective assessment of startup conditions and likely consequences of shale gas extraction for the people and natural environment. Shale gas was in the focus of attention of the authorities in Kazakhstan and Moldavia which considered this hydrocarbon resource as the significant factor for diversification of hydrocarbon supply and ensuring independence of the Russian gas. “Shale revolution” was not neglected in Russia which had to take into account the shale gas factor in the world energy balance adjusting its policy respectively. USA made attempt to push its shale contracts in Russia, thus, ensuring access to the Russian gas market. On the one hand, Russia remained indifferent to the shale boom and went on implementation of its pipeline projects, but, on the other hand, it does not waive off absolutely the potential of this hydrocarbon resource.In general, the post-Soviet countries regardless of the lack of a legislative base, technologies and unresolved environmental issues have shown certain interest in shale gas production. 

scholarly journals The expansion of innovative activity on rise of oil production enterprises in Azerbaijan

2021 ◽  
pp. 1-7
Author(s):  
A. G. Huseynov ◽  
◽  
E. A. Huseynov ◽  
Keyword(s):  
Oil And Gas ◽  
Production Condition ◽  
Oil Production ◽  
Gas Production ◽  
Innovative Activity ◽  
Gas Well ◽  
Oil And Gas Production ◽  
Article Analysis ◽  
The Republic ◽  
Innovative Techniques

The article analysis the oil and gas production condition in the Republic on basis of statistical data of many years as well as the level of investment provision. The article estimates the structure of expenses on innovative techniques, the condition of exploitation of oil and gas boreholes, the implementation of geological and technological actions, the ways of exploitation methods as well as the methods of ledge effects and influence on extra oil production. It also shows up the reserves and ways of their rational usage. Keywords: innovative activity; geological and technological actions; oil and gas; well.

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