Study on mud weight window prediction model and safety additional value of horizontal well in shales considering effects of Well's extended-reach limit

Li, Xin; Gao, Deli

doi:10.1016/j.petrol.2018.10.054

Cited by 9 publications

(2 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this paper, the method of throttling and killing by the driller is adopted in the process of establishing the mathematical model of the dynamic response of pressure in throttling and killing wellbore. At the same time, well control regulations (Li and Gao, 2019) that use bottom hole pressure to add safety value to formation pressure are adopted. Because the principle of throttling and killing is the same, the modeling process is also applicable to other well-killing methods.…”

Section: Theoretical Modelmentioning

confidence: 99%

A new approach to analyzing wellbore pressure dynamically in well-killing

Liu

Wang

et al. 2023

Front. Earth Sci.

View full text Add to dashboard Cite

Casing pressure during well-killing is both an unknown variable that must be addressed and a time-dependent function. Therefore, the calculation of the dynamic reaction of wellbore pressure during well-killing is a dynamic indeterminate boundary problem. Due to the intricacy of the analytical solution technique, finding an analytical solution for the dynamic issue of uncertain boundaries is nearly impossible. Current numerical simulation software is only capable of resolving problems with defined bounds (such as flow or pressure) and is incapable of continuously calculating the wellbore pressure, which varies dynamically with well-killing time. Developing a dynamic reaction computation method for wellbore pressure during well-killing can solve this issue. Based on the mathematical model and definite solution conditions of the wellbore pressure dynamic response under well-killing conditions, this paper applies the finite difference principle and constructs the calculation method of choke and kill wellbore pressure dynamic response through reasonable mesh division of wellbore and gradual iteration of the calculation process. The resultsdemonstrate that the maximum wellhead casing pressure value and the time node of peak value are both highly congruent with the measured data, indicating the method’s high reliability and highlighting its significance for the progress of oil and gas well control safety.

show abstract

Section: Theoretical Modelmentioning

confidence: 99%

A new approach to analyzing wellbore pressure dynamically in well-killing

Liu

Wang

et al. 2023

Front. Earth Sci.

View full text Add to dashboard Cite

show abstract

“…According to the principle of sliding friction, Mitchell [11][12] established the load model of the string shaft with buckling and determined the buckling length of the string and the contact load with the wellbore wall. Li et al [13] considered the influence of the string joint and centralizer, combined with the buckling of the drill string, and established a full string load model coupling the local and overall stress of the string. Lian et al [14] developed a finite element model of tubular string buckling, investigated the buckling form and lateral displacement of tubular string under different boundary conditions under complex working conditions, and evaluated pipe string buckling relief schemes such as optimizing output, adding a centralizer, and designing expansion joint.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Analysis of a Multi-Test String in High-Temperature and High-Pressure Deep Wells

Tang¹

2023

Fluid Dynamics &Amp; Materials Processing

View full text Add to dashboard Cite

The mechanical behavior of the test string in deep wells is generally relatively complex as a result of the high temperature and high pressure, severe dogleg and buckling effects, which in some circumstances can even lead to string failure. Traditional computational methods for the analysis of these behaviors are often inaccurate. For this reason, here a more accurate mechanical model of the test string is introduced by considering variables such as temperature, pressure, wellbore trajectory, and buckling, as well as combining them with the deformation and string constraint conditions brought in by changes in temperature and pressure during the tripping, setting, and test operations. The model is validated by applying it to a specific high-pressure gas well (located in Northeast Sichuan).

show abstract

Modeling research on the extreme hydraulic extension length of horizontal well: impact of formation properties, drilling bit and cutting parameters

Zhang²,

Wang³

et al. 2021

J Petrol Explor Prod Technol

View full text Add to dashboard Cite

Horizontal well can increase well productivity and improve the economic benefit, which significantly promotes the development of shale gas, tight oil and heavy oil. Moreover, it plays an important role in the development of natural gas hydrate. Horizontal extension ability is one of the key indexes of horizontal well, but it is always impacted by formation properties and well structure. Therefore, a model is established to analyze the impact of formation properties and well structure as comprehensive as possible, which considers not only traditional influencing factors, like formation pressure and drilling bit parameters, but also other key factors, including cutting particle size, wellbore diameter and cross section. Based on the analysis, some advises are proposed for field application. The analysis indicates that horizontal well has stronger extension ability in the formation with low formation pressure and high fracture pressure, but it is still limited by pump pressure. Under-balanced drilling can strength the extension ability in high formation pressure by reducing drilling mud density. The natural fractures in formation should be noted when drilling long horizontal well. The extension length increases and then decreases with the cutting particle size, so cutting particle has optimal size for the horizontal extension length, which can be adjusted by the rate of penetration and rotation speed. The extension length increases first and then decreases with the gap between drilling string and hole. Considering the demand of rock breaking and cutting sweeping around drilling bit, it is not recommended to adjust the drilling bit parameters. Both the cutting bed height and drilling string eccentricity have impact on horizontal extension length by changing minimum cutting-carry pump rate and annular pressure drop. Under different combinations of above two parameters, minimum cutting-carry pump rate and horizontal extension length are determined by different factors and can be divided into three parts, including acceptable cutting bed height, cutting lifting efficiency, pump pressure and total circulation pressure loss and well bottom pressure and formation fracture pressure. The findings of this study can help for better understanding of horizontal well hydraulic extension length and optimization method.

show abstract

Study on mud weight window prediction model and safety additional value of horizontal well in shales considering effects of Well's extended-reach limit

Cited by 9 publications

References 9 publications

A new approach to analyzing wellbore pressure dynamically in well-killing

A new approach to analyzing wellbore pressure dynamically in well-killing

Mechanical Analysis of a Multi-Test String in High-Temperature and High-Pressure Deep Wells

Modeling research on the extreme hydraulic extension length of horizontal well: impact of formation properties, drilling bit and cutting parameters

Contact Info

Product

Resources

About