Volume fracturing of deep shale gas horizontal wells

Jiang, Tingxue; Bian, Xiaobing; Wang, Haitao; Jia, Chengzao; Liu, Honglei; Sun, Haitao

doi:10.1016/j.ngib.2017.07.018

Cited by 43 publications

(14 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The extended exponential index method, the hyperbolic decline method, and the Duong method were used to evaluate the EUR of the Z2-H1 well [17,18], with the results of 34 million cubic meters, 49 million cubic meters, and 66 million cubic meters, respectively. There is a significant difference between various methods, among which the predicted EUR of the extended exponential index is the most pessimistic and the predicted EUR of the Duong method is the most optimistic.…”

Section: Development Effect Evaluationmentioning

confidence: 99%

Development Evaluation and Optimization of Deep Shale Gas Reservoir with Horizontal Wells Based on Production Data

Yang

Sun

et al. 2021

Geofluids

View full text Add to dashboard Cite

The implementation of horizontal wells is a key to economic development of the deep shale gas reservoir. In order to optimize the key parameters for drilling, stimulation, and the production system, the development effect of a horizontal well in deep shale gas formations was investigated from various aspects in this study. The drilling, fracturing, and production performances of this well were analyzed combining with the geological characteristics. The main technical problems and key factors that restrict the gas well performance and estimated ultimate recovery (EUR) were clarified. Through the integrated study of geology and engineering, the optimization strategies for increasing gas production and EUR are provided. The Z2 area, where the Z2-H1 well is located, has good reservoir physical properties, which bring a high drilling efficiency. However, there are still some problems during its development, such as poor fracture extension both horizontally and vertically, limited stimulated reservoir volume (SRV), rapid production declining, large water production, and serious liquid accumulation. In this study, a comprehensive approach was proposed that can improve single-well production and EUR by optimizing the target position, horizontal section length, pathway, spacing, new drilling and fracturing technology, and production system.

show abstract

Section: Development Effect Evaluationmentioning

confidence: 99%

Development Evaluation and Optimization of Deep Shale Gas Reservoir with Horizontal Wells Based on Production Data

Yang

Sun

et al. 2021

Geofluids

View full text Add to dashboard Cite

show abstract

“…Horizontal well large-section multi-cluster fracturing technology is the main process technology for volume fracturing of shale oil at present [1,2]. At present, the number of injection holes for large-scale volume fracturing of deep shale oil gradually decreases and the discharge volume gradually increases, resulting in high fluid flow velocity in a single borehole, which causes serious erosion to the borehole and leads to borehole enlargement [3,4].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Erosion of String Inner Wall in Perforation Interval in Liquid-Solid Two-Phase Flow

Zhang

Wang

Liu

et al. 2022

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

In the process of large displacement fracture injection, high flow velocity sand-carrying fluid causes serious erosion corrosion to the borehole. Based on the high-speed liquid-solid two-phase erosion experiments, the erosion experiments of single-hole set with flow velocity, sand concentration and grain size, and the three-dimensional profile scanning of the eroded orifice were carried out to investigate the erosion and corrosion expansion law of the high-speed jet orifice. The study shows that the erosion rate increases with the increase of discharge volume, sand concentration and particle size, and the change of discharge volume and sand concentration has the most significant effect on the erosion of the hole. The prediction of the hole expansion law of single hole with sand liquid injection shows that the hole diameter expands to 13mm-19mm after 90min of construction of 8 clusters of 24 holes, while the hole diameter expands to 11.7mm-12.8mm after 90min of construction of 3 clusters of 48 holes. 3 clusters of 48 holes have smaller hole diameter after the same construction time, which is better than 8 clusters of 24 densely packed holes.

show abstract

“…A number of studies have shown that the lamination texture not only affects the organic matter abundance, lithology, and mineralogy of the shales [17,22,23], but also has a direct effect on the volumetric fracture propagation law and the fracturing effect of the horizontal wells directly [24][25][26]. Some scholars proposed that there is a crucial disparity in organic matter content between the mud laminae and the silt laminae [16].…”

Section: Introductionmentioning

confidence: 99%

Lamination Texture and Its Effects on Reservoir and Geochemical Properties of the Palaeogene Kongdian Formation in the Cangdong Sag, Bohai Bay Basin, China

et al. 2021

Minerals

View full text Add to dashboard Cite

The characteristics of laminae are critical to lacustrine shale strata. They are the keys to the quality of source rocks and reservoirs, as well as engineering operations in shale plays. This study uses organic geochemistry, thin section identification, X-ray diffraction, field emission scanning electron microscopy, and other analytical methods, to reveal the detailed lamination texture and vertical distribution of laminae in the second Member of the Kongdian Formation in Cangdong Sag. The principal results are as follows: (1) A classification of laminae is proposed to characterize reservoir and geochemical properties. The five types of laminae are as follows: feldspar-quartz laminae (FQL), clay laminae (CLL), carbonate laminae (CAL), organic matter laminae (OML), and bioclastic laminae (BCL). There are also four significant lamina combinations (with the increasing TOC values): FQL-CLL combination, FQL-CLL-BCL combination, FQL-CLL-OML combination, and FQL-CAL-CLL-OML combination; (2) differences between laminae occur because of the variability in pore types and structures. There appears to be a greater abundance of intercrystalline pores of clay minerals in the FQL, CAL, BCL, and OML, and well-developed organic pores in the CAL and CLL, and the counterparts of intragranular pores of bioclastic material in the BCL. This detailed characterization provides the following comparative quantification of the thin section porosity of laminae in the second Member of the Kongdian Formation can be differentiated: CAL > FQL > OML > BCL > CLL; (3) differentiation between vertical distributions of laminae is carried out in a single well. The FQL and CLL are widely distributed in all the samples, while the BCL is concentrated in the upper part of the second Member of the Kongdian Formation, and CAL is concentrated in the lower part. This detailed classification method, using geochemical analysis and vertical distribution descriptions, offers a detailed understanding of lamination texture and its effects on reservoir and geochemical properties, which will provide a scientific guidance and technical support to better estimate reservoir quality and to identify new sweet spots in the second Member of the Kongdian Formation in the Cangdong Sag.

show abstract

Volume fracturing of deep shale gas horizontal wells

Cited by 43 publications

References 6 publications

Development Evaluation and Optimization of Deep Shale Gas Reservoir with Horizontal Wells Based on Production Data

Development Evaluation and Optimization of Deep Shale Gas Reservoir with Horizontal Wells Based on Production Data

Experimental Study on Erosion of String Inner Wall in Perforation Interval in Liquid-Solid Two-Phase Flow

Lamination Texture and Its Effects on Reservoir and Geochemical Properties of the Palaeogene Kongdian Formation in the Cangdong Sag, Bohai Bay Basin, China

Contact Info

Product

Resources

About