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The study on calculating flow pressure for tight oil well

This paper presents a new method to calculate flow pressure for tight oil well with partial penetration fracture. The solution to the diffusivity equation can be obtained using dimensionless transformation, Laplace transformation, Fourier cosine transformation and other mathematical methods. The calculation results of relative simple system are in good agreement with Kuchuk and...

A New Way to Calculate Flow Pressure for Low Permeability Oil Well with Partially Penetrating Fracture

Liu Hailong; moc.qq@806772874 Received 25 May 2017; Revised 29 August 2017; Accepted 21 March 2018; Published 30 May 2018 Academic Editor: Luca Heltai Copyright © 2018 Xiong Ping et al. This is an

The numerical simulation for multistage fractured horizontal well in low-permeability reservoirs based on modified Darcy’s equation

Based on the nonlinear percolation theory, a new nonlinear seepage model of low-permeability reservoir was established and an ideal three-phase and three-dimensional numerical reservoir simulation model for the multistage fractured horizontal well was built. By taking the impacts of pressure-sensitive effect and the threshold pressure gradient into consideration, the quasi-linear...

And-1 coordinates with CtIP for efficient homologous recombination and DNA damage checkpoint maintenance

To prevent genomic instability, cells respond to DNA lesions by blocking cell cycle progression and initiating DNA repair. Homologous recombination repair of DNA breaks requires CtIP-dependent resection of the DNA ends, which is thought to play a key role in activation of CHK1 kinase to induce the cell cycle checkpoint. But the mechanism is still not fully understood. Here, we...

Heterogeneity of competition at decameter scale: patches of high canopy leaf area in a shade-intolerant larch stand transpire less yet are more sensitive to drought

Small differences in the sensitivity of stomatal conductance to light intensity on leaf surfaces may lead to large differences in total canopy transpiration (EC) with increasing canopy leaf area (L). Typically, the increase of L would more than compensate for the decrease of transpiration per unit of leaf area (EL), resulting in concurrent increase of EC. However, highly shade...

AMPK regulates histone H2B O-GlcNAcylation

Histone H2B O-GlcNAcylation is an important post-translational modification of chromatin during gene transcription. However, how this epigenetic modification is regulated remains unclear. Here we found that the energy-sensing adenosine-monophosphate-activated protein kinase (AMPK) could suppress histone H2B O-GlcNAcylation. AMPK directly phosphorylates O-linked β-N...