Innovative technology for insulating the borehole absorbing horizons with thermoplastic materials

Sudakov, Andrii; Chudyk, І. І.; Sudakova, Diana; Dziubyk, Liudmyla

doi:10.1051/e3sconf/201912301033

Cited by 11 publications

(10 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, they have not any single-valued correlation. Elastic characteristics have been defined for the analyzed rocks taking into consideration analytical anisotropy scheme and using formulas (30), ( 31), (36), and (50)-(52) to calculate elastic characteristics of anisotropic rocks with orthotropic, and transverse-isotropic symmetry (Table 4). As it is understood from Tables 3 and 4, the rocks are characterized by significant anisotropy of velocities of elastic waves varying broadly (i.e.…”

Section: Figure 6 Scanning Scheme For Blocks Of Anisotropic Rocksmentioning

confidence: 99%

“…Papers [30]- [32] focus on kinematic characteristics of elastic wave propagation within the anisotropic media; and calculation of phase wave surfaces and wave ones. Such studies help determine approximately the velocity values in terms of some tendency as for the medium homogeneity and isotropism [33]- [36]. Hence, the problem of wave propagation within the layered media is not clearly understood which can be explained by the complexity of its theoretical description.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Studying a correlation between characteristics of rock and their conditions

Abdiev¹,

Mambetova²,

Abdiev³

et al. 2020

Min. miner. depos.

View full text Add to dashboard Cite

Purpose is to determine dependences of velocities of elastic waves in isotropic rocks and anisotropic waves with orthotropic and trans-verse-isotropic symmetry upon pressure and depth to develop evaluation criteria and control rock mass characteristics and conditions in the neighbourhood of mine workings. Methods. Continuous anisotropic medium is under consideration. Group one of boundary conditions is represented by continuity of stresses, acting normally towards the boundary while transiting from layer 1 to layer 2. Group two of the boundary conditions is as follows: displacements in the process of the boundary transition are measured continuously too. The conditions are necessary to solve a Navier Stokes equation of dynamic balance of absolutely elastic medium. The experiments were carried out with the help of geoacoustic method in terms of the acoustic parameter of compressional velocity. Findings. It has been determined that compressional velocity values, anisotropy of compressional velocity, and elastic behaviour reflect regularly structural features being pressure-dependent ones. It has been demonstrated that dependence upon the stress state, anisotropy appearance/disappearance emergence takes place or a sign inversion. Qualitative dependences have been obtained to define elastic behaviour (Е, μ, G) of anisotropic formation with orthotropic and transverse-isotropic symmetry. The dependences have been obtained through compressional velocity to consider accurately the anisotropy of the rock mass while evaluating its stress state. The research results will help estimate nature of the stress distribution; identify stress concentration zones; and zones of the disturbed rock in the neighbourhood of a mine working. That will be done using acoustic parameter of compressional velocity using a method of geoacoustic control developed by the authors. Originality. In terms of the new obtained dependences, elastic behaviour of rocks (Е, μ, G) as well as acoustic parameters of compressional velocity has been determined scientifically. They are important to design and schedule mining operations. Practical implications. Being quite accurate to satisfy the demands of practical use, the obtained research results may be applied to identify digital values of elastic behaviour (Е, μ, G); to use the method of geoacoustic control of rock mass characteristics and conditions in the neighbourhood of mine workings; and to mine deposits with complex structural and mechanical properties.

show abstract

Section: Figure 6 Scanning Scheme For Blocks Of Anisotropic Rocksmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Studying a correlation between characteristics of rock and their conditions

Abdiev¹,

Mambetova²,

Abdiev³

et al. 2020

Min. miner. depos.

View full text Add to dashboard Cite

show abstract

“…The greatest increase in the strength of the samples is observed after staying in the fuelbituminous bath for 7-8 hours [17].…”

mentioning

confidence: 93%

“…Literature review. A significant contribution to the devel opment of measures to combat the instability of clay rocks ex posed during drilling was made by A. K. Sudakov [17], І. І. Chudyk [15,16].…”

mentioning

confidence: 99%

“…Unsolved aspects of the problem. In practice, the stability of the borehole walls is increased with the help of baths which include silicate and silicatepotassium [16,17] baths. Before lifting the drill string, or during repair work, the calculated volume of silicate or silicatepotassium baths is pumped into the drill pipes and, with the help of drilling mud, it is squeezed into the zone of disturbed rocks and kept for 6-24 hours.…”

mentioning

confidence: 99%

See 1 more Smart Citation

New methods for preventing crumbling and collapse of the borehole walls

Chudyk¹,

Femiak²,

Orynchak³

et al. 2021

Nauk. visn. nat. hirn. univ.

View full text Add to dashboard Cite

Purpose. To increase the stability of the wellbore during its construction in unstable rocks. Methodology. To solve the set tasks, an integrated approach is used in the work, which includes critical analysis and generalization of scientific and technical achievements in combination with theoretical and experimental research. Findings. Factors influencing the stability of the borehole walls in conditions prone to rock slides and rock falls are analyzed. Expediency of using baths for strengthening the walls of wells in deposits of clay rocks, including clay shales, has been established and substantiated. A formulation of a fuel-bituminous bath has been proposed, the installation of which in a well for 78 hours makes it possible to increase the initial compressive strength of rocks, which will ensure the integrity of the borehole walls. It is recommended to use corrugated casing pipes to cover the sections of the wellbore where there is intensive crumbling and collapse of rocks. Originality. For the first time, the main factors of wall destruction have been established and a method has been developed to prevent the destruction of walls of directional wells composed of rocks prone to loss of stability under the action of drill string loads. Practical value. To combat the collapse of the walls of the well composed of rocks, prone to loss of stability, the authors suggested setting up fuel-bituminous baths in the range of complications. In case when the collapse of the walls of the well can not be prevented with a fuel-bitumen bath, it is proposed to overlap the area of collapse with the casing using advanced corrugated casing pipes with the injection of adhesive into the rock mass in the near-wellbore zone. The use of an adhesive material increases the contact area of the metal shell with the rock, which collapses increasing the stability of the borehole walls.

show abstract