Study of wellbore heat transfer considering fluid rheological effects in deep well acidizing

Guo, Jianchun; Liu, Zhuang; Gou, Bo; Zeng, Mingyong

doi:10.1016/j.petrol.2020.107171

Cited by 12 publications

(8 citation statements)

References 13 publications

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“…According to the previous acid etching experiment and conductivity test results, although the conductivity and retention abilities of VES acid are lower than those of gelled acid, the viscosity of spent acid is higher and the degree of non-uniform etching is greater, which is useful for enhancing acid-penetration distance. Furthermore, based on the characteristics of Ordovicianan Fengfeng reservoir, the numerical acid fracturing model was used to calculate the effective acid-penetration distance, which was 175.1 m for VES acid and 130.7 m for gelled acid, respectively, under a condition of acid injection rate of 8.0 m 3 /min and injection time of 120 min . While the effective VES acid penetration distance is increased by 33.9%, which is very beneficial to connect the far-well reservoir with rich oil and gas.…”

Section: Resultsmentioning

confidence: 99%

“…During the acid-fracturing treatment, the temperature distribution along the hydraulic fracture can be calculated by the unsteady wellbore temperature field simulation model. 16 Figure 2 shows the inlet temperature (bottom-hole temperature) and the temperature distribution along the hydraulic fracture at a fixed acid injection rate of 8 m 3 / min and 180 °C initial reservoir temperature. The volume of pad fluid used is around 50 m 3 .…”

Section: Experimental Study 231 Key Parameters Of Acid-etching Experi...mentioning

confidence: 99%

“…Furthermore, based on the characteristics of Ordovicianan Fengfeng reservoir, the numerical acid fracturing model was used to calculate the effective acidpenetration distance, which was 175.1 m for VES acid and 130.7 m for gelled acid, respectively, under a condition of acid injection rate of 8.0 m 3 /min and injection time of 120 min. 16 While the effective VES acid penetration distance is increased by 33.9%, which is very beneficial to connect the far-well reservoir with rich oil and gas.…”

Section: Fracture Conductivitymentioning

confidence: 99%

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Effect of Acid Type on Acid-Etched Fracture Surface Morphology and Conductivity along the Fracture

Gou

Guo

et al. 2023

Energy Fuels

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Laboratory measurement of acid fracture conductivity is the most direct method for acid system selection during acid fracturing in carbonate reservoirs. However, the fracture in the laboratory test is too short compared with the in-situ fracture. Thus, the acid concentration and viscosity variation and their impacts on fracture morphology and conductivity along the fracture are seldom considered, leading to inaccurate estimation of conductivity and providing uncertainty in acid selection, especially for ultra-deep carbonate reservoirs with high temperatures. To fill this knowledge gap, a series of acid-etching experiments were performed utilizing the viscoelastic surfactant-based (VES) acid and gelled acid. Fresh acid with 20 wt % and spent acid with 15 wt % concentration were used to represent the acid at the fracture-wellbore interface and that in the inner fracture. A 3D laser scanner was applied to collect fracture morphology data, which were further used to build the 2D fracture-surface roughness model via the fractal theory. Based on the model, the distribution of acid-fracture width and its roughness were exhibited, while the conductivity was tested under different closure stress. Results indicate that in comparison with gelled acid, the fresh VES acid with low viscosity exhibits strong corrosion of rock and results in the heaviest dissolved-rock weight and the maximum acid-fracture surface roughness, but the situation is just the opposite for spent acid. Conductivity shows obvious segmentation characteristics because the acid fracture narrows with the increase of closure stress. Three contact modes of acid-fracture surface cause the loss of conductivity, including longitudinal strip-like, transverse strip-like, and longitudinal and transverse flaky modes. The VES acid is selected in the YSW block based on the experimental results. The field application proves that VES-acid hybrid fracturing could result in a large increase in well production. This study gives a new horizon to selecting reasonable acid systems by testing acid-fracture conductivity.

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Section: Resultsmentioning

confidence: 99%

Section: Experimental Study 231 Key Parameters Of Acid-etching Experi...mentioning

confidence: 99%

Section: Fracture Conductivitymentioning

confidence: 99%

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Effect of Acid Type on Acid-Etched Fracture Surface Morphology and Conductivity along the Fracture

Gou

Guo

et al. 2023

Energy Fuels

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“…Proses Mikroenkapsulasi bertujuan melindungi zat inti dari pengaruh lingkungan (36) menutupi rasa dan bau tidak enak, menyatukan zat-zat yang tidak tersatukan baik secara fisika maupun secara kimia menurunkan sifat iritasi zat inti terhadap saluran cerna, mengatur pelepasan inti dan memperbaiki stabilitas bahan inti (37).…”

Section: Tujuan Mikroenkapsulasiunclassified

Peningkatan Stabilitas Fitokonstituen melalui Pendekatan Mikroenkapsulasi

2022

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Mikroenkapsulasi adalah teknologi untuk menyalut atau melapisi suatu zat inti dengan suatu lapisan dinding polimer sehingga menjadi partikel-partikel berukuran mikro. Tujuan dari mikroenkapsulasi melindungi zat inti dari pengaruh lingkungan, menutupi rasa dan bau tidak enak, menyatukan zat-zat yang tidak tersatukan baik secara fisika maupun secara kimia, menurunkan sifat iritasi zat inti terhadap saluran cerna, mengatur pelepasan inti dan memperbaiki stabilitas bahan inti. Berdasarkan hasil dari para peneliti melalui pendekatan mikroenkapsulsi. Mikroenkapsulasi dapat melindungi senyawa dari berbagai faktor lingkungan seperti oksidasi, degradasi, suhu, kelembaban dan cahaya, dapat memperpanjang umur simpan produk menutupi rasa dan bau aromatik. Dapat meningkatkan stabilitas pada senyawa yang bersifat volatil dan meningkatkan bioavabilitas, sehingga mikroenkapsulasi ini dapat digunakan sebagai pilihan untuk sediaan bahan alam berupa ekstrak, karena bahan alam berupa ekstrak umumnya memiliki stabilitas yang tidak baik, seperti mudah teroksidasi, degradasi, dan fotolisis, selain itu memiliki kelarutan yang rendah dan bioavaibilitas yang rendah. Dengan demikian melalui pendekatan mikroenkapsulasi ini dapat meningkatkan stabilitas ekstrak, melindungi senyawa aktif, dan mencegah penurunan aktivitas. Metode yang digunakan menggunakan beberapa referensi yang didapatkan dari database dan dengan instrumen pencarian online yang diterbitkan secara internasional. Referensi yang didapatkan berasal dari database elektronik seperti google scholar, sciendirect, NCBI dari tahun 2010-2020.

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“…Pipelines are an important isuue in this field in its structure and transporting it with safety ways in [4][5][6] alot of methods has discussed to structure the piplines with perfect way and in limited sizes with effeciency work. Transforming is the last phase after extraction oil to make it ready for use and it depends on alot of factors that affect on it such as high temprature that oil properities must handled with that high temprature and alot of challenges that will be faced, an insulating oil is used to make the transformer so cold to operate safely and using a specific materials with exact temprature for each material by secure transfering of these materials and energies [7,8].…”

Section: Introductionmentioning

confidence: 99%

A survey on predicting oil spills by studying its causes using deep learning techniques

Nasr

Al-Sheref

Elwahab

2021

IJEECS

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<span>It’s so easy to know the accidents as it’s already happened and solving these accidents is immediately handled, but searching for a solution for these accidents, don’t deny the existence of reasons that made accidents happen. Knowing the source of accidents will help in avoiding them to occur in the future. It’s an important field in searching as some human lives depend on the safety of such a field, so it’s so important to use a powerful technique to define these reasons as the research point in spill accidents and predicting accidents and to predict the occurrence of the accident before its happening depending on its reasons that lead to that accident in past times so with similar conditions it might happen an accident but it needs a sufficient data and a powerful technique such as deep learning techniques that give very precise results and by using this tool an Intelligent Model will build to predict oil spilling. In this survey paper, related work will be discussed to enhance that work.</span>

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Study of wellbore heat transfer considering fluid rheological effects in deep well acidizing

Cited by 12 publications

References 13 publications

Effect of Acid Type on Acid-Etched Fracture Surface Morphology and Conductivity along the Fracture

Effect of Acid Type on Acid-Etched Fracture Surface Morphology and Conductivity along the Fracture

Peningkatan Stabilitas Fitokonstituen melalui Pendekatan Mikroenkapsulasi

A survey on predicting oil spills by studying its causes using deep learning techniques

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