The Experts below are selected from a list of 315 Experts worldwide ranked by ideXlab platform
Boyun Guo - One of the best experts on this subject based on the ideXlab platform.
-
Chapter 6 – Well Deliverability
Petroleum Production Engineering, 2017Co-Authors: Boyun Guo, Xinghui Liu, Xuehao TanAbstract:Well deliverability is determined by the combination of well inflow performance and wellbore flow performance. The former describes the deliverability of the reservoir, whereas the latter presents the resistance to flow of Production String. This chapter focuses on prediction of achievable fluid Production rates from wells including vertical, horizontal, fractured, multi-fractured, and multilateral wells. The technique of analysis is called Nodal analysis. Local flow path dimension, fluid properties, and heat transfer must be considered to improve accuracy. It is vitally important to validate inflow performance relationship and tubing performance relationship models before performing Nodal analysis on a large scale. A Nodal analysis model is not considered to be reliable before it can match well Production rates at two bottom-hole pressures.
-
An Improved Model for Predicting Fluid Temperature in Deep Wells
2016Co-Authors: Boyun Guo, Jinze SongAbstract:The objective of this study was to develop an improved method to predict fluid temperature profiles in high-temperature wells for designing Production String in deep-water development. The method was developed on the basis of heat transfer involves heat convection and conduction inside the Production String and in the annular space. The governing equations were solved using the method of characteristics, resulting in two simple closed-form equations. The method was coded in a spreadsheet for easy applications. Data from three wells were employed to check the accuracy of the new method. Comparisons of results from Hasan's method, Gilbertson et al.'s method, and the new method with temperature data measured in two gas-lift wells show that the new method best predicts well temperatures in trend. A comparison of results given by Mao's method and the new method with temperatures observed in a deep-water gas well testing indicates that the new method better predicts well temperatures with errors less than 4%. This work provides petroleum engineers a simple and accurate method for predicting temperature profiles in oil and gas Production operations, especially deep-water operations. It eliminates the need for sophisticated analytical and numerical models in fluid temperature analysis.
-
6 – Well Deliverability
Petroleum Production Engineering, 2007Co-Authors: Boyun GuoAbstract:Publisher Summary Well deliverability is determined by the combination of well inflow performance and wellbore flow performance. The former describes the deliverability of the reservoir, whereas the latter presents the resistance to flow of Production String. This chapter focuses on prediction of achievable fluid Production rates from reservoirs with specified Production String characteristics. The technique of analysis is called nodal analysis In the industry, the principle is applied with a piecewise approach to handle local flow path dimension, fluid properties, and heat transfer to improve accuracy. It is vitally important to validate inflow performance relationship and tubing performance relationship models before performing nodal analysis on a large scale. A nodal analysis model is not considered to be reliable before it can match well Production rates at two bottom-hole pressures.
-
Effect of Stress Concentration Factors due to Corrosion on Production String Design
SPE Production & Facilities, 2005Co-Authors: Kai Sun, G. Robello Samuel, Boyun GuoAbstract:Summary With the increase in operating costs and the need to withstand the cyclical swing of the oil prices, there is a growing demand for cost-effective Production operations. Challenges associated with extreme depth, pressures, and temperatures at which corrosion is a problem can translate to additional problems caused by tubing burst, collapse, and tension. Tubular goods subjected to corrosion suffer strength deterioration. This becomes detrimental when coupled with cyclic loading. Failure of tubings could lead to disastrous consequences and the loss of the well, and if tubing Strings are not designed in consideration of corrosion effects, it could also result in problems that will require well-control operations. Stress concentration caused by corrosion cavity plays an important role in tubing design under corrosive environment. The objective of this study was to develop a new criterion for designing corrosion-resistant tubular Strings in deepwater and ultradeep high-temperature/high-pressure wells. This paper presents results of our theoretical investigations of the corrosion effects on tubing-strength degradation. A new method and a revised criterion have been proposed to predict the threshold pressure for degraded tubing strength. Analytical formulae have been developed for calculating stresses around semispherical cavities, shallow surface cavities, and deep spherical cavities in the body of tubular Strings. The effects of stress concentration on tubing strength are analyzed with these formulae. Solutions are also presented in the form of plots that can be easily used by the Production engineers. An application example is presented in this paper. Introduction Corrosion pits act as stress risers and decrease the pressure integrity of tubing, resulting in tubing failure. There are many references that sought to quantify the design of tubing subjected to different loads during Production operations. Comparatively little research has assessed the effect and integrity of the tubing strength on the basis of the corrosion pits' geometry shapes and dimensions. Thus, it is highly desirable to predict the extent of stress concentration caused by corrosion-induced pits and cavities for both the designing and evaluating processes. Schmitt et al.1 experimentally studied the localized corrosion caused by erosion and pitting corrosion. The induction period and the effects of the precut grooves on the localized corrosion were studied. They analyzed the cause and effect of the pitting and corrosion during sweet-gas Production and presented methods to inhibit the attack. Pitting corrosion studies indicate that pitting corrosion is a localized form of corrosion by which holes are produced in the structure wall.2–11 Pitting causes localized attacks on the tubing and is one of the most destructive forms of corrosion. The loss of weight because of pits is much lower, thereby making it difficult to detect the intensity of pitting corrosion. The initiation period of pitting is long, and, once initiated, the rate of pitting increases at a much higher rate. The loss of weight caused by pits is most likely to occur in the presence of chloride ions, combined with such depolarizers as oxygen or oxidizing salts. Small scratches, defects, and impurities in the steel pipe wall can initiate the pitting process. Mechanism analysis has shown that, because pits can be either hemispherical or cup-shaped apart from the localized loss of thickness, corrosion pits on the tubing wall can cause severe local-stress concentrations if the tubing is subjected to loads. The most damaging load for tubing is the burst load. Burst loads to the well tubing originated from the column of Production fluid that holds a very high pressure and acts on the inside wall of the tubular structure. Even though the tubing is initially designed with proper safety factors, the change in the loading condition during the life of the well may lead to bursting of the tubing because of degradation of the tubing strength caused by corrosion. If the tubing Strings are not properly designed, it may result in a tubing burst and, thereby, blowout and loss of the well.12
Liu Ping-li - One of the best experts on this subject based on the ideXlab platform.
-
Research and Application of Acidizing Fluid Formulae with Original Production String Acidizing for Bohai SZ36-1 Oil Field
offshore Oil, 2005Co-Authors: Liu Ping-liAbstract:SZ36-1 oil field of Bohai is weakly consolidated sand formation which is characteristic of high porosity, permeability and viscosity. In order to realize an acidizing treatment with original Production String which will lead to an effective removal of the near wellbore zone plug and a deep penetration of the acid without significant erosion of downhole String, ESP and its wireline, an acidizing fluid foumula fluorboric acid is selected on the base of analyzing the feature of SZ32-1 oil field and running a large number of laboratory experiments. This formular can remove the plugging of near wellbore zone effectively and do little damage to gravel pack, downhole String, ESP and its wireline, and also maintain its good quality after a 2-day lay aside, which meets the needs of interval injecting acid when platform area is limited.
-
Original Production String Acidizing for Bohai Oilfield
offshore Oil, 2004Co-Authors: Liu Ping-liAbstract:Original Production String acidizing is a new technology, which can greatly shorten the recycle of acidizing treatment and economize operating cost. The key and detail problems of the new technology are discussed in the paper, which provides invaluable experience for subsequent reservoir stimulation.
Liu Zuocai - One of the best experts on this subject based on the ideXlab platform.
-
Mechanical Behavior of the Production String in High-Temperature and High-Pressure Wells
Chemistry and Technology of Fuels and Oils, 2020Co-Authors: Sun Tongcheng, Sun Lianzhong, Yang Xiaohui, Sun Tengfei, Liu ZuocaiAbstract:High-temperature and high-pressure wells are facing a lot of problems such as complicated stress on the Production String, severe deformation, and annular pressure, which seriously restrict the pace of drilling and development of HPHT oil and gas resources in China. In this paper, theoretical analysis and software calculation are combined to study the stress and deformation of an HTHP well String. Based on the research results, the authors have established an algorithm and method of mechanical analysis for high-temperature and high-pressure wells. The method could be effectively applied to drill String analysis in high-temperature and high-pressure well conditions. Lastly, the developed method of analysis and calculation algorythm has been verified for the actual Production conditions. Based on the proposed calculation method, we have evaluated the force, deformation, and trap pressure values of the drilling String and packer under different working conditions. The results can be used to assess the safety of field operations. In this paper we provide the algorithm and method for Production String analysis in HTHP wells.
Sinopec Southwest - One of the best experts on this subject based on the ideXlab platform.
-
THE EFFECT OF STRUCTURE OF HORIZONTAL WELL ON HORIZONTAL GAS WELL DELIQUIFICATION IN WEST SICHUAN
Xinjiang Oil & Gas, 2013Co-Authors: Sinopec SouthwestAbstract:With the degree of horizontal wells development increasing,horizontal wells accumulate fluid in wellbore is a common problem.This paper analyzes affecting factor of horizontal gas well deliquification,such as target point height difference between A target and B target,Production String diameter,Production String structure.Results of the analysis show that if B target is higher than A target,the fluid is easier to carry out from horizontal wells.Currently,Production String diameter and Production String structure of Staged fracturing in casing horizontal wells and open hole horizontal well hamper implementing deliquification.
-
The technological practice of testing HJ203H horizontal sulfurous gas well
offshore Oil, 2010Co-Authors: Sinopec SouthwestAbstract:HJ203H is the first horizontal well in Jia'er high pressure sulfurous gas reservoir in Northeast Sichuan Heba block.The well is deep with high corrosion partial pressure,formation leaked easily and kill plugging is very difficult.By analyzing the difficulty of the well test,downhole tools were selected,the Production String structure and flow chart were optimized,and process control parameters of main ground test procedure were studied,such as the pulp,fuel injector control and killing,etc.As a result,a test technology of horizontal sulfurous gas wells was created and it has been successfully applied in HJ203H well.
-
Application of Apollo Greenzyme Unblocking Technique in Baise Oilfield
2007Co-Authors: Sinopec SouthwestAbstract:It is serious in Baise oilfield that partial oil wells make sand flow,emulsification and wax deposit with formation plugging in oil layers.Conventional acidizing treatment can not be used in some oil wells because of the bad well condition and sand Production.So Apollo Greenzyme unblocking techniques are introduced to apply in Baise.This paper gives a way of operating with original Production String after analyzing and discussing the working mechanism of Greenzyme unblocking agent,14 experiments are done including 13 wells,of which 12 get the effect of unblocking and the increasing oil Production.The efficiency of stimulation is 85.7% and the incremental oil arrives at 270.6t.Since the investment is 325000 yuan and the incoming is 565000 yuan,the input/output reaches 1:1.74.
Wang Yan-bi - One of the best experts on this subject based on the ideXlab platform.
-
Development of Mechanics Behavior Simulation Experimental System for Deep-Water Drilling and Production String
Oil Field Equipment, 2014Co-Authors: Wang Yan-biAbstract:Simulated the deepwater drilling String mechanics behavior and obtained the stress deformation distribution of String using experimental method is of great significance to ensure the reliability and safety of all kinds of drilling and Production String in deepwater operations.In order to achieve this purpose,a special experiment device was developed which is called deepwater drilling and Production String simulation experiment system.The equipment can be used to simulate the marine environment of 0~3 000mwater depth and can apply both inside and outside pressure and axial force to simulation String at present and can also realize transverse force and torque load after equipped with corresponding attachments.The experiment device has several advantages such as high load pressure,quick response,large dismounting space,simple operation and reliable data collection.
