Computational Analysis of Stress Interference Effect for Hydraulic Fracturing in Waste Injection Wells

Abstract Hydraulic fracturing has been demonstrated to be a cost-effective method of developing low-permeability heterogeneous clastic reservoirs with vertical wells. In the presence of a thin shale layer as a seal, monitoring effective fracture height becomes extremely important. The conventional approach of a single-regime production logging may be ineffective due to the complex geometry of fluid flow in the near-wellbore zone around the well. The paper describes the experience of the multi-rate through barrier diagnostics as a method of improving hydraulic fracturing evaluation. The standard way to diagnose the effectiveness of hydraulic fracturing is to log a survey under current operating conditions. In general, temperature and passive spectral acoustic measurements provide useful information on identifying the boundaries of fluid movement behind production casing; however, it is difficult to determine if flow occurs in the vertical hydraulic fracture or channeling through damaged cement in a single-regime survey. The multi-rate through-barrier diagnostics allow analyzing the flow dynamics of the wellbore-fracture-formation system under different flowing regimes, enabling a more accurate assessment of fluid movement in the near-wellbore environment within several meters. The paper includes the results of the multi-rate logging survey campaign in vertical water injection wells drilled in a low-permeability clastic reservoir. A proppant-based hydraulic fracturing of the target formation was carried out in the wells. The geological structure of the developed reservoir includes a thin shale layer (break) that separates the target oil-saturated interval from the overlying water bearing reservoir. In order for the operator to optimize future stimulation programs identification of effective hydraulic fracture height in reservoir regions with different shale thicknesses is crucial. The upper boundaries of the injected fluid movement behind the casing were determined based on the survey results. Analysis of the acoustic and temperature field dynamics helped more reliably evaluate the nature of the fluid movement behind the casing, whether flow happens in vertical fracture or cement channeling. This results in a more precise quantitative assessment of the injection profile in the targeted and untargeted reservoir units.

Download Full-text

RESEARCH OF CHANNELS OF SUPER CONDUCTIVITY OF THE INTERWELL SPACE

Oil and Gas Studies ◽

10.31660/0445-0108-2016-5-46-56 ◽

2016 ◽

pp. 46-56

Author(s):

S. I. Grachev ◽

A. V. Strekalov ◽

A. T. Khusainov

Keyword(s):

High Pressure ◽

Hydraulic Fracturing ◽

Hydraulic Resistance ◽

Scientific Research ◽

High Conductivity ◽

Water Flooding ◽

Economic Factors ◽

Injection Wells ◽

Capital Costs ◽

Low Hydraulic Resistance

Currently, the most powerful and energy-intensive method of influence on the productive strata is water flooding. Due to certain economic factors, dictated by saving of capital costs on drilling of injection wells, a number of injection wells is much smaller than the development wells number. It is natural, that for full-value compensation of volumes of produced liquid from the development wells, taking into account losses, it is necessary to pump large volumes of water which can reach 1000-2500 m3 per day into a less number of injectors. Such conditions of water flooding lead to a need to create high pressure at the bottomhole and repression in the injection wells, which contributes the unfocused hydraulic fracturing. The results of the scientific research performed by S. I Grachev and A. S. Trofimov in a number of known fields using the method of tracer studying have shown that in all fields, where such studies were conducted, there observed the so-called channels with ultra-low hydraulic resistance, or with ultra-high conductivity/ permeability.

Download Full-text

Analytical review of underground equipment of water impact operation for well development

RUDN Journal of Engineering Researches ◽

10.22363/2312-8143-2021-22-1-100-112 ◽

2021 ◽

Vol 22 (1) ◽

pp. 100-112

Author(s):

Eugeny S. Yushin

Keyword(s):

Hydraulic Fracturing ◽

Field Data ◽

Oil And Gas ◽

Water Impact ◽

Injection Wells ◽

Oil And Gas Fields ◽

Formation Zone ◽

Analytical Review ◽

Underground Equipment ◽

Gas Fields

Rational indicators for the development of oil and gas fields are related to the systemic maintenance of a given level of perfection of formation opening in bottomhole zones of producing or injection wells. This need arises with the colmatation of the natural collector by mechanical, asphalt and tar-paraffinic particles, leading to a decrease in productivity, acceptance of wells and the need to restore the inflow by methods of artificial action on the bottomhole formation zone. Analysis of the effectiveness of the application of various methods of stimulating the flow of reservoir products in the fields of the Timan-Pechora oil and gas province (based on field data) allowed to argue the success of using hydraulic fracturing, thermogas chemical, and shock-depressive effects on the bottomhole formation zone. The prospect of the development of technical means for impact-depressive (implosion) impact on the bottomhole formation zone favorably distinguished by simplicity, cheapness, manufacturability and accessibility is shown. The designs of implosion hydrogenerators of single and multiple pressure are analyzed, shortcomings of technical devices are identified and ways of improving mechanisms are outlined. The results of effective application of various downhole generator devices for increasing productivity and well acceptance are presented.

Download Full-text

A Study on the Largest Hydraulic Fracturing Induced Earthquake in Canada: Numerical Modeling and Triggering Mechanism

Bulletin of the Seismological Society of America ◽

10.1785/0120200251 ◽

2021 ◽

Author(s):

Bei Wang ◽

Alessandro Verdecchia ◽

Honn Kao ◽

Rebecca M. Harrington ◽

Yajing Liu ◽

...

Keyword(s):

Hydraulic Fracturing ◽

Pore Pressure ◽

Elastic Stress ◽

Local Stress ◽

Numerical Approach ◽

Rock Matrix ◽

Triggering Mechanism ◽

Injection Wells ◽

Induced Earthquake ◽

Matrix Deformation

ABSTRACT The Mw 4.6 earthquake that occurred on 17 August 2015 northwest of Fort St. John, British Columbia, is considered the largest hydraulic-fracturing-induced event in Canada, based on its spatiotemporal relationship with respect to nearby injection operations. There is a ∼5 day delay of this Mw 4.6 mainshock from the onset of fluid injection at the closest well pad (W1). In contrast, other two nearby injection wells (W2 and W3) have almost instantaneous seismic responses. In this study, we first take a forward numerical approach to investigate the causative mechanisms for the Mw 4.6 event. Specifically, three finite-element 3D poroelastic models of various permeability structures and presence or absence of hydraulic conduits are constructed, to calculate the coupled evolution of elastic stress and pore pressure caused by multistage fluid injections. Our simulation results suggest that pore pressure increase associated with the migration of injected fluid is required to accumulate sufficient stress perturbations to trigger this Mw 4.6 earthquake. In contrast, the elastic stress perturbation caused by rock matrix deformation alone is not the main cause. Furthermore, injection and seismicity at W1 may have altered the local stress field and brought local faults closer to failure at sites W2 and W3. This process could probably shorten the seismic response time and, thus, explain the observed simultaneous appearance of injection and induced seismicity at W2 and W3.

Download Full-text

WATERFLOOD-INDUCED FRACTURE ON THE INJECTION WELLS IN LOW-PERMEABILITY RESERVOIR OF ACHIMOV SEQUENCE

Oil and Gas Studies ◽

10.31660/0445-0108-2018-2-39-43 ◽

2018 ◽

pp. 39-43

Author(s):

A. V. Klimov-Kayanidi ◽

R. T. Alimkhanov ◽

E. S. Agureeva ◽

R. M. Sabitov

Keyword(s):

Hydraulic Fracturing ◽

Low Permeability ◽

Reservoir Pressure ◽

Reservoir Properties ◽

Injection Wells ◽

Field Development ◽

Low Permeability Reservoir ◽

Fracture Formation ◽

Maintenance Systems

Achimov sequence is characterized by high heterogeneity and low reservoir properties, that makes it impossible economically profitable field development without hydraulic fracturing and usage reservoir pressure maintenance systems. The research aims to develop recommendations for regulating the operations of injection wells, in conditions of waterflood-induced fracture formation. The recommendations can be used to further regulate the waterflooding system for the conditions of Achimov sequence.

Download Full-text

METHODS OF INCREASING PROJECT LEVELS OF CRUDE OIL PRODUCTION AT THE DEVELOPMENT OF MULTILAYER DEPOSITS

Oil and Gas Studies ◽

10.31660/0445-0108-2017-6-95-101 ◽

2017 ◽

pp. 95-101

Author(s):

V. V. Panikarovskii ◽

E. V. Panikarovskii

Keyword(s):

Hydraulic Fracturing ◽

Crude Oil ◽

Enhanced Oil Recovery ◽

Oil Recovery ◽

Oil Production ◽

Injection Wells ◽

Crude Oil Production

A brief review of the work on intensifying the inflow and increasing the oil recovery of the Neocomian deposits of the Priobskoye field is expounded. The analysis of technologies for increasing oil recovery of AS10, AS11, AS12 is performed. The technology of hydraulic fracturing in production and injection wells and methods of selecting wells for hydraulic fracturing in the operational well stock of the Priobskoye field are considered. Based on the analysis of enhanced oil recovery technologies, the need for hydraulic fracturing in low-productivity reservoirs has been proved.

Download Full-text

Features of development of US1 object at the oil field X

Oil and Gas Studies ◽

10.31660/0445-0108-2020-6-49-59 ◽

2021 ◽

pp. 49-59

Author(s):

S. F. Mulyavin ◽

R. A. Neschadimov

Keyword(s):

Hydraulic Fracturing ◽

Energy State ◽

Geological Structure ◽

Oil Field ◽

Reservoir Properties ◽

Injection Wells ◽

Recoverable Reserves ◽

Oil Water ◽

Water Saturated ◽

Further Development

The oil field X belongs to the category of large in terms of initial recoverable reserves, multi-layer and complex in geological structure. The US1 object accounts for 20,3 % of the initial recoverable reserves, while the selection from the initial recoverable reserves is only 11,4 %, this makes object the most promising from the point of planning further development of the field. The analysis presented in the article is aimed at identifying problems and features of the development. During the analysis, we noted low reservoir properties of the object, high watercut of the produced products, the deterioration of the energy state of the deposits, which manifests itself in the form of a decrease in dynamic levels and a decrease in fluid flow rate. Drilling of wells, both production and injection, was carried out using hydraulic fracturing technology. Given the fact that the deposits of the US1 object are closed, lithological shielded and are characterized by the absence of an oil-water zone, the watering of wells, according to the our opinion, is associated with pulling up water from the underlying water-saturated formation as a result of the propagation of cracks obtained during hydraulic fracturing. The reason for the deterioration of the energy state is the commissioning of injection wells using hydraulic fracturing and the withdrawal of water through hydraulic fracture in the underlying formation.

Download Full-text