Impact of cross-flow on well production in shale reservoir considering vertical variation of reservoir and fracture properties: Model and field application

2021 ◽  
pp. 109739
Author(s):  
Meng Li ◽  
YuLiang Su ◽  
WenDong Wang ◽  
YaJun Li ◽  
MingZhe Dong
Keyword(s):  
Cross Flow ◽  
Field Application ◽  
Vertical Variation ◽  
Fracture Properties ◽  
Well Production ◽  
Shale Reservoir

scholarly journals Performance Evaluation of Multistage Fractured Horizontal Wells in Tight Gas Reservoirs at Block M, Ordos Basin

Energies ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 613
Author(s):  
Li Wu ◽  
Jiqun Zhang ◽  
Deli Jia ◽  
Shuoliang Wang ◽  
Yiqun Yan
Keyword(s):  
Ordos Basin ◽  
Horizontal Wells ◽  
Entropy Method ◽  
Field Application ◽  
Tight Sandstone ◽  
Factors Affecting ◽  
Well Production ◽  
Advantages And Disadvantages ◽  
Single Well ◽  
Fractured Horizontal Wells

Block M of the Ordos Basin is a typical low-permeability tight sandstone gas accumulation. To develop these reservoirs, various horizontal well fracturing technologies, such as hydra-jet fracturing, open-hole packer multistage fracturing, and perf-and-plug multistage fracturing, have been implemented in practice, showing greatly varying performance. In this paper, six fracturing technologies adopted in Block M are reviewed in terms of principle, applicability, advantages, and disadvantages, and their field application effects are compared from the technical and economic perspectives. Furthermore, the main factors affecting the productivity of fractured horizontal wells are determined using the entropy method, the causes for the difference in application effects of the fracturing technologies are analyzed, and a comprehensive productivity impact index (CPII) in good correlation with the single-well production of fractured horizontal wells is constructed. This article provides a simple and applicable method for predicting the performance of multi-frac horizontal wells that takes multiple factors into account. The results can be used to select completion methods and optimize fracturing parameters in similar reservoirs.

Innovative Method to Optimize Down Hole Control Valves by Well Modeling

2021 ◽  
Author(s):  
Akram R. Barghouti ◽  
M. Imran Javed ◽  
Saud A Al-Shuwaier
Keyword(s):  
Cross Flow ◽  
Production Optimization ◽  
Productivity Index ◽  
Gas Industry ◽  
Control Valves ◽  
Well Production ◽  
Future Production ◽  
Multi Stage ◽  
Production Strategy ◽  
Well Completions

Abstract The revolution of smart well completions has been significantly enhancing the oil & gas industry in the recent years, The completions allow for higher PIs, better sweep, longer well life, longer reservoir contact and better water management. These effects came into play and needed once O&G industry moved to drilling multi-lateral wells. This paper represents a tri-lateral well that was drilled with high reservoir contact. The production optimization was completed to evaluate the contribution of each lateral and decide on the future production strategy for the well. This evaluation also allowed to test the functionality of the Down Hole Flow Control Valves (DHFCVs). Further, determining this functionality allowed identifying cross flow between the ICVs and the laterals. The optimization included multi-stage testing of each lateral to ascertain the high oil & water contributors. The water contribution was recorded across each lateral to optimize the water production and enhance the well productivity. The productivity index was calculated using IPR modeling utilizing Pipe-Sim software based on the commingled multi-rate tests. To further plan the way forward on the well production, a flowchart was established during the optimization operation to guide through the optimization process, identify each lateral water contribution, and production strategy after the operation. This optimization has resulted in a significant cost avoidance, avoiding coil tubing horizontal logging intervention operations in all the three laterals. The details of the testing stages scenarios and the recommendations of the production strategies will be shared in this paper.

scholarly journals Characteristics of transient pressure performance of horizontal wells in fractured-vuggy tight fractal reservoirs considering nonlinear seepage

2019 ◽  
Vol 74 ◽  
pp. 57 ◽  
Author(s):  
Ruizhong Jiang ◽  
Chunguang Zhang ◽  
Yongzheng Cui ◽  
Qiong Wang ◽  
Wei Zhang ◽  
...  
Keyword(s):  
Cross Flow ◽  
Field Application ◽  
Nonlinear Parameter ◽  
Test Interpretation ◽  
Well Test ◽  
Hole Pressure ◽  
Bottom Hole ◽  
Fractal Index ◽  
Matrix Blocks ◽  
Seepage Characteristics

Since the classical seepage theory has limitations in characterizing the heterogeneity of fractured-vuggy tight reservoirs, well test interpretation results are not consistent with actual production by far. Based on the nonlinear percolation theory, a new nonlinear seepage equation considering the boundary layer and yield stress was derived to describe the seepage characteristics of dense matrix blocks and the stress sensitivity and fractal features of fracture systems were characterized by applying the fractal theory. Thus, the nonlinear model of a horizontal well in a fractured-vuggy tight fractal reservoir was established naturally. Then the finite element method was applied to solve the bottom hole pressure based on the processing of internal boundary conditions. After solving the model, the seepage characteristics of different models were summarized by analyzing the bottom hole pressure dynamic curves and the sensitivity analysis of multiple parameters such the nonlinear parameter and fractal index were conducted. Finally, the practicality of the model was proved through a field application. The results show that the pressure dynamic curves can be divided into nine flow stages and the increase of the nonlinear parameter will cause the intensity of the cross flow from matrix blocks to the fracture system to decrease. The fractal index is irrelevant to the intensity of the cross flow while it decides the upwarping degree of the curve at the middle and late flow stages. On the basis of the results of the field application, it can be concluded that the model fits well with actual production and the application of this model can improve the accuracy of well test interpretation.

scholarly journals An Analytical Model for Multilayer Well Production Evaluation to Overcome Cross-Flow Problem

2017 ◽  
Author(s):  
Farizal Hakiki ◽  
Aris T. Wibowo ◽  
Silvya D. Rahmawati ◽  
Amega Yasutra ◽  
Pudjo Sukarno
Keyword(s):  
Analytical Model ◽  
Flow Problem ◽  
Cross Flow ◽  
Well Production

Fractal-Based Production Analysis for Shale Reservoir Considering Vertical Cross-Flow

Fractals ◽  
2021 ◽  
Author(s):  
Yuliang Su ◽  
Meng Li ◽  
Wendong Wang ◽  
Mingzhe Dong
Keyword(s):  
Cross Flow ◽  
Production Analysis ◽  
Shale Reservoir

New Calculation Method and Application of Gas Loss From Coring Shale Gas Well

2020 ◽  
Vol 142 (10) ◽  
Author(s):  
Wuguang Li ◽  
Zhang Jian ◽  
Xiaokai Chen ◽  
Hao Chen
Keyword(s):  
Shale Gas ◽  
New Method ◽  
Gas Content ◽  
Gas Well ◽  
Measuring Device ◽  
Gas Dispersion ◽  
Well Production ◽  
Single Well ◽  
Shale Reservoir ◽  
Gas Loss

Abstract Gas content is one of the most important parameters of shale reservoir evaluation and productivity evaluation. In order to obtain gas content accurately, based on the first law of Fick and material balance equation, mathematical model of gas dispersion flow in shale reservoir is established, analytical solution is obtained, and evaluation method of gas dispersion in shale reservoir is formed. On the basis of this study, the onsite desorption gas measuring device and testing process for coring shale gas wells are designed, the time-varying shale desorption gas is obtained, and the residual gas of shale is measured by the crushing method. The calculation formula of shale gas content is obtained by fitting the test data, the shale gas loss, and total gas content are calculated, and then analyzed the influences of the shale gas-bearing properties and gas content on single well production and geological reserves by combining the data of shale absorbed gas. The results show that the gas content calculated by the new method is about 6.54% more than that of log interpretation, and about 7.57% on average more than that obtained by traditional empirical method. The gas content proportion of long Yi1 subsegmental small layers 1 and 2 is smaller than that of long Yi1 subsegmental small layers 3 and 4 and long Yi2 subsegmental. It is considered that the amount of shale gas lost is large, because of the pressure release during the coring, and the comparative error of gas content obtained by several methods is within the acceptable range. So the new method can be used as an important mean to obtain shale gas content. The most direct factors affecting gas content are complex: Buried depth, porosity, total organic carbon content, water saturation, and formation temperature. Shale gas content is the material basis of single well production and geological reserves of shale gas, and it is also the decisive factor. Therefore, the accurate evaluation of shale gas content is one of the key techniques to evaluate shale gas well productivity and shale gas resources, which is of great significance.

Two-Phase Type-Curve Analysis of Flowback Data from Hydraulically Fractured Hydrocarbon Reservoirs

2021 ◽  
Author(s):  
Fengyuan Zhang ◽  
Hamid Emami-Meybodi
Keyword(s):  
Shale Gas ◽  
History Matching ◽  
Marcellus Shale ◽  
Field Application ◽  
Curve Analysis ◽  
Fracture Permeability ◽  
Two Phase ◽  
Type Curve ◽  
Fracture Properties ◽  
Curve Method

Abstract This study presents a new type-curve method to characterize hydraulic fracture (HF) attributes and dynamics by analyzing two-phase flowback data from multi-fractured horizontal wells (MFHWs) in hydrocarbon reservoirs.The proposed method includes a semianalytical model, as well as a workflow to estimate HF properties (i.e., initial fracture pore-volume and fracture permeability) and HF closure dynamics (through iterating fracture compressibility and permeability modulus).The semianalytical model considers the coupled two-phase flow in the fracture and matrix system, the variable production rate at the well, as well as the pressure-dependent reservoir and fluid properties. By incorporating the contribution of fluid influx from matrix into the fracture effective compressibility, a new set of dimensionless groups is defined to obtain a dimensionless solution for type-curve analysis. The accuracy of the proposed method is tested using the synthetic data generated from six numerical simulation cases for shale gas and oil reservoirs. The numerical validation confirms the unique behavior of type curves during fracture boundary dominated flow and verifies the accuracy of the type-curve analysis in the characterization of fracture properties. For field application, the proposed method is applied to two MFHWs in Marcellus shale gas and Eagle Ford shale oil.The agreement of interpreted results between the proposed method and straight-line analysis not only demonstrates the practicality in field application but also illustrates the superiority of the type-curve method as an easy-to-use technique to analyze two-phase flowback data. The analysis results from both of the field examples reveal the consistency in the estimated fracture properties between the proposed method and long-term history matching.

Simultaneous removal of nitrate and phosphate using cross-flow micellar-enhanced ultrafiltration (MEUF)

2004 ◽  
Vol 50 (6) ◽  
pp. 227-234 ◽  
Author(s):  
B.-K. Kim ◽  
K. Baek ◽  
J.-W. Yang
Keyword(s):  
Cationic Surfactant ◽  
Positive Charge ◽  
Cetylpyridinium Chloride ◽  
Cross Flow ◽  
Field Application ◽  
Synthetic Wastewater ◽  
Molar Ratio ◽  
Simultaneous Removal ◽  
Distilled Water ◽  
Micellar Enhanced Ultrafiltration

The feasibility of cross-flow micellar-enhanced ultrafiltration (MEUF) was investigated to remove nitrate and phosphate simultaneously. At the above critical micelle concentration (CMC), a cationic surfactant added in wastewater forms micelles, which have positive charge on their surface. Anionic contaminants such as nitrate and phosphate can be bound on the micelles by electrostatic interaction, and the micelle-pollutants complex is removed effectively by ultrafiltration. In this study, a cross-flow MEUF system was designed and investigated the feasibility of MEUF for field application. A cationic surfactant, cetylpyridinium chloride (CPC), was used, and the synthetic wastewater was treated by the polyacrylonitrile membranes with molecular weight cut-off (MWCO) of 30,000 Da and 10,000 Da. With the molar ratio of CPC to total pollutants of > 3, > 86% of nitrate and > 91% of phosphate were removed, respectively, and > 97% of CPC was also rejected. The flux was maintained 20Ð30% of the flux of distilled water. Therefore, it is feasible to remove nitrate and phosphate simultaneously using the cross-flow MEUF system.

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