The Effect of Evolved CO2 on Wormhole Propagation in Carbonate Acidizing

2017 ◽  
Vol 32 (03) ◽  
pp. 325-332 ◽  
Author(s):  
Haoran Cheng ◽  
Ding Zhu ◽  
A. D. Hill
Keyword(s):  
Carbonate Acidizing

Multiscale Modeling of Carbonate Acidizing Using Continuous Time Random Walk Approach

2017 ◽  
Author(s):  
Kang Kang ◽  
Elsayed Abdelfatah ◽  
Maysam Pournik ◽  
Bor Jier Shiau ◽  
Jeffrey Harwell
Keyword(s):  
Random Walk ◽  
Multiscale Modeling ◽  
Continuous Time ◽  
Continuous Time Random Walk ◽  
Carbonate Acidizing

Analytical Model for Estimation of Pore Volume to Breakthrough in Carbonate Acidizing with Organic and Mineral Acids

2021 ◽  
Author(s):  
Sina Lohrasb ◽  
Radzuan Junin ◽  
Augustine Agi ◽  
Mohd Zaidi Jaafar ◽  
Afeez Gbadamosi ◽  
...  
Keyword(s):  
Empirical Model ◽  
Pore Volume ◽  
Reaction Rates ◽  
Coefficient Of Determination ◽  
Oil Well ◽  
Treatment Technique ◽  
Carbonate Formation ◽  
Carbonate Cores ◽  
Experimental Works ◽  
Carbonate Acidizing

Abstract Acidizing is one of the most useful methods in the oil well stimulations. This treatment technique creates capillary wormholes in the carbonate formations to enhanced fluids flow production of a reservoir. One of the main indexes for recognizing the wormhole characterization is the pore volume to breakthrough number. Therefore, calculating this number is one of the main goals in the carbonate acidizing. Obtaining this number is always required for experimental works, which needs time, energy and cost. In this article, an empirical model was used to evaluate carbonate acidizing procedure in the limestone and dolomite cores as the carbonate cores. This empirical model measures the number of wormholes formed in the carbonate cores after acid injection by using the conservation of mass law. In this method, the transport relative reaction rates of acid and core inside the structure of wormhole was maintained during the wormhole creation process. Growing the wormhole in the carbonate formation was developed step by step. Changes in acid concentration as an injected fluid flow were accounted for in this empirical model. Also, the changes in carbonate porosity, the effect of Damköhler number, and injection rate were included in the model. Two types of carbonate rocks and five types of acids with different molar masses were used in this model for the analysis and validation of the model. The results from experimental works was significance and justifies the use of use of the law for mass transport and chemical reactions. Evaluation of the developed model with other experimental and numerical results gave an excellent assessment of 95.45% for the average accuracy and 0.9933 for the average coefficient of determination. Therefore, an empirical technique to approximate the pore volumes to breakthrough number in the limestone and dolomite cores with high accuracy using physical core and acid properties is proposed.

Carbonate Acidizing and Flowback Analysis- A Review and an Evaluation Method

2018 ◽  
Author(s):  
Bashayer Aldakkan ◽  
Abdullah M. Al Moajil ◽  
Khalid Alnoaimi
Keyword(s):  
Evaluation Method ◽  
Carbonate Acidizing

Flowback Analysis Methodologies and Precipitation Risk During Siderite-Bearing Carbonate Acidizing

2021 ◽  
Author(s):  
Abdualilah Al Baiz ◽  
Abdullah Al Moajil
Keyword(s):  
Iron Concentration ◽  
Carbonate Reservoir ◽  
Environmental Scanning ◽  
X Ray Diffraction ◽  
X Ray ◽  
Fluid Analysis ◽  
Analysis Methodology ◽  
Carbonate Acidizing ◽  
Rock Analysis ◽  
Theoretical Amount

Abstract Acidizing is the most commonly used method to stimulate carbonate reservoirs. To achieve a better assessment of the operation, a flowback analysis is conducted. Flowback analysis can give insights on the reservoir's response to the recipe. This analysis can be used to improve future treatment operations where some recommendations were deduced. The objective of this paper was to show the flowback analysis methodology following carbonate acidizing treatments with a focus on dissolved elements. X-ray diffraction (XRD), X-ray fluorescence (XRF), environmental scanning electron microscope (ESEM), and inductive coupled plasma (ICP) were used to determine the composition of flowback fluids and the filtered precipitate. Combining the data from different techniques onsite and in laboratory assess the development of a methodology for calculating more accurate amounts of dissolved elements, formation water, and volumes of recovered fluids. This analysis showed acid recipes efficiency of nearly 100% based dissolved calcite. Around 65% of injected fluids were lost into a formation. The iron concentration during the flowback was 1400 ppm, however, cumulative amount of iron in flow back samples was below expected value. Based on the formation's rock analysis, the theoretical amount of iron in the recovered flowback fluid was 1000 kg. The measured amount of iron was 500 kg and the rest could be assumed to be precipitated in a reservoir. This study helps in understanding the flowback fluid analysis and its importance by using a step-by-step analysis procedure for flowback fluid samples from the carbonate acidizing operations. The results of this study help in tracking the elements that potentially help in estimating the lost fluids volumes and percentage of success for a carbonate reservoir acid operation.

A Successful Case History of Carbonate Acidizing for High H2S Gas Well in China

2016 ◽  
Author(s):  
Minh Vo ◽  
Kevin Scott ◽  
Chaohong Xiao ◽  
Qiang Wang ◽  
Zhengxing Dai ◽  
...  
Keyword(s):  
Case History ◽  
Gas Well ◽  
Successful Case ◽  
History Of ◽  
Carbonate Acidizing
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