Mechanism study on steering acid fracture initiation and propagation under different engineering geological conditions

Hou, Bing; Dai, Yifan; Zhou, Changlin; Zhang, Kunpeng; Liu, Fei

doi:10.1007/s40948-021-00271-4

Cited by 11 publications

(4 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This study presents the effect of thermal osmosis effect on wellbore stability and can also be introduced to the discussion of thermal osmosis effect on hydraulic fracturing [43,44].…”

Section: Time-dependent Potential Of Boreholementioning

confidence: 99%

Porothermoelastic Response of a Borehole in Fluid-Saturated Medium Subjected to Thermal Osmosis Effect

2023

View full text Add to dashboard Cite

With the thermo-hydro-mechanical coupling process considered, this paper derives a set of analytical porothermoelastic solutions to field variables including the stress, displacement, and pore pressure fields to evaluate the wellbore stability around a vertical borehole drilled through an isotropic porous rock. The thermal effect on the wellbore stability of the low-permeability saturated rock also introduces the thermal osmosis term. The wellbore problem is decomposed into axisymmetric and deviatoric loading cases considering the borehole subjected to a nonhydrostatic stress field. It obtains the time-dependent distributions of field variables by performing the inversion technique for Laplace transforms to the porothermoelastic solutions in the Laplace domain. The results suggest that the thermal osmosis effect should not be neglected on the premise that a lower permeability porous rock is characterized by the substantially large thermal osmotic coefficient and the small thermal diffusivity values. The case that the thermal osmosis effect reduces the undrained loading effect leads to the decrease of the mean shear stress that is determined by the effective maximum and minimum stress around a borehole, since, and accordingly contributes to the wellbore stability to resist the shear failure.

show abstract

“…This study presents the effect of thermal osmosis effect on wellbore stability and can also be introduced to the discussion of thermal osmosis effect on hydraulic fracturing [43,44].…”

Section: Time-dependent Potential Of Boreholementioning

confidence: 99%

Porothermoelastic Response of a Borehole in Fluid-Saturated Medium Subjected to Thermal Osmosis Effect

2023

View full text Add to dashboard Cite

show abstract

“…On the premise of a certain twisted rate of the twisted band, the greater the fluid velocity, the smaller the attenuation degree of the spiral strength. 38 , 39 At the same fluid flow rate, the smaller the twisted rate of the twisted band, the higher the spiral strength and the longer the safe flow distance of hydrate.…”

Section: Theoretical Analysismentioning

confidence: 99%

Experimental Study on Hydrate Safe Flow in Pipelines under a Swirl Flow System

Rao

Liu

Wang³

et al. 2022

ACS Omega

View full text Add to dashboard Cite

With the development of oil and gas resources gradually extending to the deep sea, the blockage of gas hydrate is attracting more and more attention. How to inhibit hydrate blockage efficiently and economically in oil and gas gathering transportation pipelines and ensure the safe operation has become a hot and difficult point in the field of oil and gas gathering and transportation research. At present, the research on the safe flow of gas hydrate is still in the exploratory stage, and applying swirl flow to hydrate risk control technology has a great engineering application value. A systematic experimental study on the safe flow of gas hydrate in a swirl flow system is carried out herein. The experimental results show the following: (1) The laws of gas hydrate flow, transport, deposition, and pipe plugging under various experimental conditions of the swirl flow system are obtained, the safe flow region of hydrate under the swirl flow system in the pipeline is obtained, and the safe flow boundary of hydrate is expanded. (2) Beginning with the theoretical analysis of the safe flow of gas hydrate in a pipeline, the flow characteristics of gas hydrate in the flow system are described; the special flow form of swirl flow has a great influence on the safe flow law of hydrate. (3) The growth and coalescence mechanisms of spiral hydrate in two mainstream systems of separated flow and dispersed flow are explored and researched. The critical tangential velocity of flow is taken as the standard of criterion.

show abstract

“…RJD technology can increase the contact area with reservoir, establish high diversion channel, and efficiently exploit complex oil and gas reservoirs, which has achieved good application. Combined with reservoir simulation technologies such as hydraulic fracturing, full three-dimensional reconstruction can be realized to achieve the goal of enhanced oil recovery [5][6][7][8][9][10][11][12][13]. Recently, with more and more attention paid to clean energy, RJD technology is considered as an effective geothermal and hydrate resource development technique [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Flow Field Simulation of Swirling Abrasive Jet Nozzle for Hard Rock Breaking

Zhang

et al. 2022

Geofluids

View full text Add to dashboard Cite

Radial jet drilling (RJD) technology has been proved to be an economical and efficient stimulation technology for oil and gas, geothermal, hydrate, etc. but conventional RJD technology adopts pure water jet to break rock and form laterals, which has low rock breaking efficiency and is unable to effectively break hard rock such as shale. Swirling abrasive jet is proposed to promote the development of RJD. Here, the characteristics of the flow field of the swirling abrasive jet nozzle and the influence of the key impeller parameters are studied by numerical simulation. The distribution and development of axial velocity, tangential velocity, and radial velocity of water and abrasive are analyzed. The results show that the swirling abrasive jet has no constant velocity core, has stronger diffusivity, and can form a larger impact area than the direct jet. Abrasive particles and water can acquire large tangential and radial velocity which can break rock under the action of shear and tensile stress efficiently. With the increase of the spinning angle, the axial velocity of the fluid decreases, and the tangential velocity increases gradually. With the increase of blade thickness, the axial velocity decreases, and the tangential velocity increases. With the increase of the number of blades, the axial velocity decreases, and the tangential velocity increases. The spinning direction almost has no effect on the flow field. Therefore, the spinning angle is recommended to be no less than 270°, blade thickness is 2.5 mm, and number of blades are 3. The research results provide theoretical guidance for the structural design of swirling abrasive jet nozzles.

show abstract

Mechanism study on steering acid fracture initiation and propagation under different engineering geological conditions

Cited by 11 publications

References 14 publications

Porothermoelastic Response of a Borehole in Fluid-Saturated Medium Subjected to Thermal Osmosis Effect

Porothermoelastic Response of a Borehole in Fluid-Saturated Medium Subjected to Thermal Osmosis Effect

Experimental Study on Hydrate Safe Flow in Pipelines under a Swirl Flow System

Flow Field Simulation of Swirling Abrasive Jet Nozzle for Hard Rock Breaking

Contact Info

Product

Resources

About