Productivity-Prediction Model of Acid Fracturing Horizontal Well in Fracture-Cavity Reservoir

2013 ◽  
Vol 321-324 ◽  
pp. 872-876
Author(s):  
Yang He ◽  
Yong Ming Li ◽  
Jin Zhou Zhao ◽  
Ye Zhang ◽  
Tao Lin ◽  
...  
Keyword(s):  
Prediction Model ◽  
Horizontal Well ◽  
Material Balance ◽  
Production Capacity ◽  
Basic Principles ◽  
Acid Fracturing ◽  
Oil Storage ◽  
Cavity System ◽  
Seepage Theory ◽  
Productivity Prediction

Due to the particularity of the fracture-cavity reservoir space, the seepage theory developed from homogeneous reservoir cant be applied to predict the productivity of fracture-cavity reservoir. This paper simplified the fracture-cavity system to an oil storage vessel, and based on the basic principles of material balance, established the productivity-prediction model which was suitable for the acid fracturing horizontal well in fracture-cavity reservoir. The results showed that the productivity of fracture-cavity system was high and steady. Meanwhile, the connected fracture-cavity system had a greater contribution to increasing production capacity than other factors.

A Productivity Prediction Model for the Gravel-packed Horizontal Well

2013 ◽  
Vol 31 (6) ◽  
pp. 633-642 ◽  
Author(s):  
Y. Li ◽  
M. Li ◽  
L. Wang ◽  
Z. Yao ◽  
W. Meng
Keyword(s):  
Prediction Model ◽  
Horizontal Well ◽  
Productivity Prediction

Fatigue Life Prediction of Buckling String with Cracks in Horizontal Wells of Mining Engineering

2012 ◽  
Vol 577 ◽  
pp. 127-131 ◽  
Author(s):  
Peng Wang ◽  
Tie Yan ◽  
Xue Liang Bi ◽  
Shi Hui Sun
Keyword(s):  
Fatigue Life ◽  
Prediction Model ◽  
Life Prediction ◽  
Horizontal Well ◽  
Drill Pipe ◽  
Prediction Method ◽  
Drill String ◽  
Fatigue Life Prediction ◽  
Mining Engineering ◽  
Life Prediction Model

Fatigue damage in the rotating drill pipe in the horizontal well of mining engineering is usually resulted from cyclic bending stresses caused by the rotation of the pipe especially when it is passing through curved sections or horizontal sections. This paper studies fatigue life prediction method of rotating drill pipe which is considering initial crack in horizontal well of mining engineering. Forman fatigue life prediction model which considering stress ratio is used to predict drill string fatigue life and the corresponding software has been written. The program can be used to calculate the stress of down hole assembly, can predict stress and alternating load in the process of rotating-on bottom. Therefore, establishing buckling string fatigue life prediction model with cracks can be a good reference to both operation and monitor of the drill pipe for mining engineering.

An Integrated Experimental Method to Investigate Tool-Less Temporary-Plugging Multistage Acid Fracturing of Horizontal Well by Using Self-Degradable Diverters

SPE Journal ◽  
2020 ◽  
Vol 25 (03) ◽  
pp. 1204-1219 ◽  
Author(s):  
Lufeng Zhang ◽  
Fujian Zhou ◽  
Jianye Mou ◽  
Wei Feng ◽  
Zhun Li ◽  
...  
Keyword(s):  
Fracture Surface ◽  
Evaluation System ◽  
Horizontal Well ◽  
Single Type ◽  
Fracture Width ◽  
Acid Fracturing ◽  
Integrated Method ◽  
Tight Carbonate ◽  
Operation Cost ◽  
Insight Into

Summary Tool-less temporary-plugging multistage acid fracturing of horizontal well is a necessary technology to unlock the production potential and enable commercial productivity for tight carbonate reservoirs. However, this technique has not been investigated experimentally yet, and the plugging behavior of diverters within acid-etched fracture is still unclear. In this paper, we propose an integrated method to experimentally study tool-less multistage fracturing with diverters. First, we introduce an innovative 3D printing method to reproduce the roughness of acid-etched fracture surface and design an acid-etched fracture temporary plugging evaluation system to satisfy the requirements of temporary plugging experiments. Then, we conduct a series of plugging experiments to optimize the diverter's formula for creating a tight plugging zone within an acid-etched fracture under different fracture widths. On the basis of the description of the fracture surface, we further analyze the formation process and mechanism of temporary plugging. Finally, we further verify through laboratory experiments using a modified true tri-axial fracturing system the feasibility of using a single type of diverter and combined diverters to achieve tool-less temporary plugging staged fracturing of horizontal well. The experimental results show the following findings: (1) Pure fibers can realize temporary plugging at lower fracture width (≤2 mm). (2) To achieve temporary plugging, the diameter of particulates should not be less than half of the fracture width under the condition of larger fracture width (≥4 mm). (3) The fracture surface morphology affects the formation time of temporary plugging, but does not affect whether temporary plugging is formed or not. (4) Using a steel plate with a smooth fracture surface to conduct optimization experiments will increase the dosage of diverters, thus increasing the operation cost. (5) Pure particulates cannot achieve favorable plugging effect. This study provides an insight into multistage acid fracturing.

Research on Variance Principle of Critical Producing Pressure Drop of Horizontal Well in Gas Reservoir with Bottom Water

2012 ◽  
Vol 616-618 ◽  
pp. 674-679
Author(s):  
Ke Liu Wu ◽  
Xiang Fang Li ◽  
Xiao Ting Gou
Keyword(s):  
Pressure Drop ◽  
Horizontal Well ◽  
Bottom Water ◽  
Material Balance ◽  
Sweep Efficiency ◽  
Gas Reservoir ◽  
Vertical Permeability ◽  
Balance Principle ◽  
Water Viscosity ◽  
The Difference

According to material balance principle, gas/water bearing height in gas reservoir with bottom water could be deduced. Additionally, sweep efficiency could be approximately determined, then based on the equivalent flowing resistance method and critical vertical velocity of bottom water drive, computational model of Critical Producing Pressure Drop during the development of gas reservoir with bottom water could be derived. Therefore, the variance principle of Critical Producing Pressure Drop of horizontal well can be expressed quantitatively, and this paper also analyzes that it is influenced by the ratio of vertical permeability to horizontal permeability, the difference between water and gas density, the ratio of water viscosity to gas viscosity and height for bottom water coning. The results could provide guidelines for the determination of reasonable producing pressure drop and producing rate of horizontal well in gas reservoir with bottom water.

Productivity Analysis of Transverse Horizontal Well Commingling in Stripped Gas Reservoir with Bottom Water

2013 ◽  
Vol 868 ◽  
pp. 657-663
Author(s):  
Wen Qi Zhao ◽  
Lian Yu ◽  
Lun Zhao ◽  
Li Chen ◽  
Song Chen
Keyword(s):  
Gas Flow ◽  
Horizontal Well ◽  
Bottom Water ◽  
Constant Pressure ◽  
Production Condition ◽  
Productivity Analysis ◽  
Gas Reservoir ◽  
Constant Rate ◽  
Seepage Theory ◽  
The Green Function

Banded gas reservoir with bottom water is a typical gas reservoir. Based on the development characteristics of formation, the further study on commingling production by transverse horizontal well is done, and also combined with seepage theory including the Green function, Duhamel method etc. the dimensionless definitions of relative parameter are given. Whats more, the derivation and formula of production can be achieved respectively under the constant pressure condition and constant production condition. Meanwhile, take commingling production with three banded gas layers for example. Whether the initial pseudo pressure for these layers are equal or not, in both of these cases, the variation curve of gas productivity under the constant pressure and constant rate conditions is described separately. And the law of variation of gas flow backward for some layer when the physical properties of these layers are significantly different.

Mathematical Modeling of Heat Transfer and Pressure Drops in the Single- and Dual-Pipe Horizontal Wells

2016 ◽  
Vol 9 (1) ◽  
Author(s):  
Xiaohu Dong ◽  
Huiqing Liu ◽  
Zhangxin Chen
Keyword(s):  
Heat Transfer ◽  
Horizontal Well ◽  
Horizontal Wells ◽  
Steam Injection ◽  
Thermal Recovery ◽  
Pressure Drops ◽  
Injection Process ◽  
Single Pipe ◽  
Productivity Prediction ◽  
Transfer Mechanisms

In this paper, from the heat transfer mechanisms between perforated horizontal well and formation, the mathematical models for the heat transfer and pressure drops of the horizontal well with different steam injection pipe configurations are developed. All the conventional single-pipe, concentric dual-pipe, and parallel dual-pipe configurations are considered. A correlation is proposed to represent a relationship between the thermophysical properties of the formation and the formation pressure and temperature. Then, using the method of wellbore microcontrol elements and node analysis, the steam injection process in the three different well configurations is numerically investigated. Based on the test data of a parallel dual-pipe horizontal well from an actual oilfield, a steam backflow procedure for the parallel dual-pipe configuration is proposed to confirm the sealed status of a thermal packer. The theoretical investigation plays an important role in the performance evaluation and productivity prediction of horizontal well-based thermal recovery projects. Furthermore, it also sheds some important insights on a steam injection project design with dual-pipe horizontal wells.

Fractured horizontal well productivity prediction in tight oil reservoirs

2017 ◽  
Vol 151 ◽  
pp. 159-168 ◽  
Author(s):  
Jinghong Hu ◽  
Chong Zhang ◽  
Zhenhua Rui ◽  
Yanlong Yu ◽  
Zhangxin Chen
Keyword(s):  
Horizontal Well ◽  
Oil Reservoirs ◽  
Tight Oil ◽  
Well Productivity ◽  
Fractured Horizontal Well ◽  
Tight Oil Reservoirs ◽  
Productivity Prediction
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