Multi-fractured stimulation technique of hydraulic fracturing assisted by the DTH-hammer-induced impact fractures

Li, Yanliang; Peng, Jianming; Huang, Chaoyang; Lian, Moke; Xu, Tianfu; Zhang, Yanjun; Bo, Kun; Feng, Bo; Zhou, Jian

doi:10.1016/j.geothermics.2019.05.016

Cited by 21 publications

(7 citation statements)

References 30 publications

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“…Literature review indicates that a variety of fracturing fluids have been used in experiments. ey include oil [76], water [77], guar gum [72], liquid carbon dioxide (L-CO 2 ) [78], supercritical carbon dioxide (SC-CO 2 ) [79], linear gel [80], polymer fluid [68], calcium chloride (CaCl 2 ) solution [81], methyl methacrylate (MMA) [57], nitrogen [10], and bentonite slurry [82]. Moreover, in an experiment, the fracturing fluid is often mixed with a fluorescent compound (Figure 1(c)) for better tracing of hydraulic fractures [83].…”

Section: Fracturing Fluids Fracturing Fluids Play Crucial Roles In Amentioning

confidence: 99%

“…Moreover, in an experiment, the fracturing fluid is often mixed with a fluorescent compound (Figure 1(c)) for better tracing of hydraulic fractures [83]. e fluorescent compound can be red ink [69] or dye of various colors such as red [84], green [85], blue [86], luminous yellow [66], and purple [77]. e commonly adopted fracturing fluids and their basic parameters as well as the medium used for tracing of hydraulic fractures are summarized in Table 1.…”

Section: Fracturing Fluids Fracturing Fluids Play Crucial Roles In Amentioning

confidence: 99%

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Advances in Laboratory‐Scale Hydraulic Fracturing Experiments

Qian

Guo

Wang

et al. 2020

Advances in Civil Engineering

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Hydraulic fracturing has been widely applied to stimulate the natural gas and oil production from unconventional reservoirs. To optimize the design of hydraulic fracturing in this application, an accurate estimation of the initiation and propagation of hydraulic fractures is indispensable. However, it still remains challenging as a result of the complex stress state and geological conditions. On account of their ability to complete control some significant factors and efficient observation of fracture geometry, laboratory-scale hydraulic fracturing experiments have received abundant research attention in recent years. This paper presents a review of the state of the art of laboratory-scale hydraulic fracturing experiments, focusing on the scaling analysis, experimental setup, fracturing fluids, and sample preparation. A discussion of the directions for future research is also provided with the intention of stimulating the development of the experimental technique for investigating hydraulic fracturing.

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Section: Fracturing Fluids Fracturing Fluids Play Crucial Roles In Amentioning

confidence: 99%

Section: Fracturing Fluids Fracturing Fluids Play Crucial Roles In Amentioning

confidence: 99%

Advances in Laboratory‐Scale Hydraulic Fracturing Experiments

Qian

Guo

Wang

et al. 2020

Advances in Civil Engineering

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“…With the advantages of high drilling efficiency, minimal accidents, and good quality of borehole, percussive rotary drilling has found extensive applications in geological core drilling, solid mineral exploration, engineering geological exploration, geothermal drilling, and other fields and is gradually applied to oil and gas drilling [1][2][3]. During percussive rotary drilling process, a down-the-hole (DTH for short) hammer is used to generate impact energy, which is one of the most important components in percussive rotary drilling [4,5]. The DTH air hammer utilizes compressed air as power to drive its piston moving up and down at high speed and impacting its drill bit, which cooperates with the rotary power from drilling rigs to realize percussive rotary drilling [6,7].…”

Section: Introductionmentioning

confidence: 99%

Simulation and Analysis of a Split Drill Bit for Pneumatic DTH Hammer Percussive Rotary Drilling

Shi,

2024

Geofluids

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Reverse circulation impact drilling has the advantages of high drilling efficiency and less dust, which can effectively form holes in hard rock and gravel layer. As integral reverse circulation drill bits used in the conventional down-the-hole (DTH) hammers are only suitable for specific formations, the whole set of DTH hammer needs to be replaced when drilling different formations. In this paper, several types of split drill bits for different drilling technologies are designed. The flow field characteristics of one of the split drill bits is analyzed based on the computational fluid dynamics (CFD) method, with four technic parameters considered, which are input flow rate, number of inlet holes, angle of injection exhaust holes, and diameter of injection exhaust holes, respectively. Three parameters are selected as indicators to evaluate the rationality and performance of the split drill bit, which are injection exhaust hole outlet mass flow rate, ratio of the mass flow rate out of injection exhaust holes to the whole inlet mass flow rate, and maximum pressure at the upper end of the split drill bit. According to the CFD analysis results, the above four technic parameters influence the flow rate and pressure in different rules. Considering the injection capacity, pressure loss, and bit strength, inlet holes of 10, injection exhaust holes with an angle of 50°, and injection exhaust holes with a diameter of 12 mm are recommended to obtain ideal reverse circulation. Different types of split drill bits were manufactured, and drilling experiments were carried out in unconsolidated formations. The maximum drilling rate can reach 1.5 m/min in the drilling experiments. The split drill bit proposed in this paper exhibits excellent adaptability for reverse circulation drilling in loose formations.

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“…Li et al [23] observed that a large number of impact fractures can be achieved. In addition, Li et al [24] pointed out that hammer-induced fractures were stimulated by hydraulic fracturing.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Dynamics of Vibro-Impacting Indenter

2023

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We investigated a vibro-impacting indenter interacting with strata in the form of metal or rock samples experimentally and via mathematical modelling. An experimental programme was undertaken on the custom-designed rig at the Centre for Applied Dynamics of the University of Aberdeen. The mathematical models captured the essential mechanics when the indenter interacted with the metal or rock samples. The mathematical functions describing the discontinuous phases were specific to the metal and rock samples. Appropriate switch functions were constructed for indenter positions, as well as for the penetration depth, wherever appropriate. To seek a correlation between the experiments and modelling, a careful direct numerical integration of the equations of motion describing each discontinuous phase of the system dynamic response enabled time histories, phase trajectories and amplitude spectra to be computed. The developed mathematical model facilitates the optimisation of vibro-impact dynamical responses.

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Multi-fractured stimulation technique of hydraulic fracturing assisted by the DTH-hammer-induced impact fractures

Cited by 21 publications

References 30 publications

Advances in Laboratory‐Scale Hydraulic Fracturing Experiments

Advances in Laboratory‐Scale Hydraulic Fracturing Experiments

Simulation and Analysis of a Split Drill Bit for Pneumatic DTH Hammer Percussive Rotary Drilling

Nonlinear Dynamics of Vibro-Impacting Indenter

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