Study of alternating acid fracturing treatment in carbonate formation based on true tri-axial experiment

Zhang, Kunpeng; Chen, Mian; Zhou, Changlin; Dai, Yifan; Liu, Fei; Li, Jiaxin

doi:10.1016/j.petrol.2020.107268

Cited by 20 publications

(6 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Multistage alternating acid fracturing is an enhanced mode of pre-pad acid fracturing, employing alternate stages of pad fluid and acid. It currently stands as the primary deep-penetrating acid-fracturing technology [9,15,16]. Compared to conventional gelled acid fracturing and pre-pad acid fracturing, multi-stage alternating acid fracturing has the following obvious advantages: first, the introduction of high viscosity fracturing fluid into the fracture reduces the acid leakoff in wormholes and natural fractures [9,15]; second, the non-reactive fracturing fluid or weakly reactive autogenic acid can effectively lower the acid-rock reaction temperature and increase the acid penetration distance [17,18]; third, the viscosity difference between the fracturing fluid and acid facilitates the occurrence of a viscous fingering phenomenon, creating non-uniform etching on the fracture surfaces and thereby improving the conductivity of acid-etched fractures [10].…”

Section: Introductionmentioning

confidence: 99%

Effect of Acid-Injection Mode on Conductivity for Acid-Fracturing Stimulation in Ultra-Deep Tight Carbonate Reservoirs

Liu,

Ren,

Feng

et al. 2024

Processes

View full text Add to dashboard Cite

The conductivity of acid-etched fractures and the subsequent production response are influenced by the injection mode of the fracturing fluid and acid fluid during acid fracturing in a carbonate reservoir. However, there has been a lack of comprehensive and systematic experimental research on the impact of commonly used injection modes in oilfields on conductivity, which directly affects the optimal selection of acid-fracturing injection modes. To address this gap, the present study focuses on underground rock samples, acid systems, and fracturing fluid obtained from ultra-deep carbonate reservoirs in the Fuman Oilfield. Experimental investigations were conducted to examine the conductivity of hydraulic fractures etched by various types of acid fluids under five different injection modes: fracturing fluid + self-generating acid or cross-linked acid; fracturing fluid + self-generating acid + cross-linked acid. The findings demonstrate that the implementation of multi-stage alternating acid injection results in the formation of communication channels, vugular pore space, and natural micro-cracks, as well as grooves and fish-scales due to enhanced etching effects. The elevation change, amount of dissolved rock, and conductivity exhibited by rock plates are significantly higher in comparison to those achieved through the single-acid injection mode while maintaining superior conductivity. It is recommended for optimal conductivity and retention rate in the Fuman Oilfield to adopt two stages of alternating acid-fracturing injection mode. Field application demonstrated that two-stages of alternating acid-fracturing generate more pronounced production response than the adjacent wells.

show abstract

Section: Introductionmentioning

confidence: 99%

Effect of Acid-Injection Mode on Conductivity for Acid-Fracturing Stimulation in Ultra-Deep Tight Carbonate Reservoirs

Liu,

Ren,

Feng

et al. 2024

Processes

View full text Add to dashboard Cite

show abstract

“…The Earth's dynamics are diverse, including the gravitational forces of the core and mantle, the rotation of the Earth, and the gravitational forces caused by plate movements. Ground stresses are difficult to quantify and study because of the complex causes [10] . At present, it is recognized that there are three principal stresses in the Earth, namely the horizontal maximum principal stress, the horizontal minimum principal stress, and the principal vertical stress.…”

Section: Introductionmentioning

confidence: 99%

A refined evaluation method for the stress field of the Chang 7₃ shale oil reservoir of northern Shaanxi

Hou

Wang

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

View full text Add to dashboard Cite

Shale oil resources are abundant in the Chang 73 reservoir in the eastern Ordos Basin. The thin interbeds of shale in the Chang 73 section of the Yanchang Formation in the oil-bearing section are developed with solid interlayer inhomogeneity and unclear longitudinal interlayer stress difference. This has resulted in unpredictable high seam extension heights during hydraulic fracturing. Based on the results of the Kaiser experiments, the lithological variability was finely described by combining with downhole core observations, and the longitudinal interlayer stress difference coefficient in the Chang 73 section was finely interpreted by using logging data to evaluate the regional distribution pattern of ground stress in the Chang 73 shale reservoir in northern Shaanxi. After studying 600 wells in north of Shaanxi, it was found that: the maximum longitudinal ground stress variation in the Chang 73 reservoir with a thickness of 30-50 m was 35-55 MPa, the minimum ground stress variation was 30-50 MPa, and the minimum was 30 MPa. The horizontal stress difference in the Chang 73 reservoir north of Shaanxi was 3.2-8.6 MPa. The maximum horizontal stress was high in the northwest and low in the southeast, with high values distributed in Jiyuan and Dingbian areas and low values distributed in Zhidan. The refined evaluation of the ground stress results guides the selection of the fracturing layer and the optimal design of the horizontal well trajectory in the field.

show abstract

“…As the demand for oil and gas continues to increase, there has been a growing emphasis on efficient and sustainable extraction methods [3][4][5]. Acid fracturing technology is one such method that can enhance reservoir permeability and improve oil recovery rates [6,7].…”

Section: Introductionmentioning

confidence: 99%

Localized Corrosion Mechanism of Q125 Casing Steel in Residual Acid Solution during Oil Reservoir Acidizing

Yan

Wang

et al. 2023

Coatings

View full text Add to dashboard Cite

This paper aims to investigate the localized corrosion mechanism of Q125 casing steel in residual acid solution with Mannich base type inhibitors during oil reservoir acidizing process. The corrosion behavior of Q125 casing steel in fresh acid (20% HCl) and residual acid solution (pH 1.0 and pH 3.0 HCl) with and without 3-(4-chlorophenylimino)-1-(piperidine-1-ylmethyl) indolin-2-one (Mannich base type, Mb) inhibitor was studied by electrochemical test, weight loss, and surface analysis. The morphology and composition of corrosion products were analyzed by SEM/EDS and XPS; the local corrosion rate of casing steel with or without inhibitor was obtained by 3D profilometry. It was determined that the inhibitor had higher inhibition efficiency in fresh acid conditions than in residual acid conditions. Under the condition of residual acid, the decrease in inhibitor molecular coverage on the substrate surface promotes the occurrence of local corrosion. Pitting corrosion was detected in the residual acid solution containing Mannich base inhibitor, which may be related to the fact that FeCO3 hinders the adsorption of inhibitor molecules on the substrate surface.

show abstract

Study of alternating acid fracturing treatment in carbonate formation based on true tri-axial experiment

Cited by 20 publications

References 15 publications

Effect of Acid-Injection Mode on Conductivity for Acid-Fracturing Stimulation in Ultra-Deep Tight Carbonate Reservoirs

Effect of Acid-Injection Mode on Conductivity for Acid-Fracturing Stimulation in Ultra-Deep Tight Carbonate Reservoirs

A refined evaluation method for the stress field of the Chang 7₃ shale oil reservoir of northern Shaanxi

Localized Corrosion Mechanism of Q125 Casing Steel in Residual Acid Solution during Oil Reservoir Acidizing

Contact Info

Product

Resources

About

Study of alternating acid fracturing treatment in carbonate formation based on true tri-axial experiment

Cited by 20 publications

References 15 publications

Effect of Acid-Injection Mode on Conductivity for Acid-Fracturing Stimulation in Ultra-Deep Tight Carbonate Reservoirs

Effect of Acid-Injection Mode on Conductivity for Acid-Fracturing Stimulation in Ultra-Deep Tight Carbonate Reservoirs

A refined evaluation method for the stress field of the Chang 73 shale oil reservoir of northern Shaanxi

Localized Corrosion Mechanism of Q125 Casing Steel in Residual Acid Solution during Oil Reservoir Acidizing

Contact Info

Product

Resources

About

A refined evaluation method for the stress field of the Chang 7₃ shale oil reservoir of northern Shaanxi