This article is the first investigation on dual permeability flow issue for horizontal well-production in a naturally fractured dual-porosity reservoir. Based inter-porosity from matrix system to fracture and treating media directly connected with wellbore as systems, we established model of then solved using some modern mathematical methods, such Laplace integral transformation, separation variables, eigenvalue, eigenfunction. Later article, obtained standard log–log type curves numerical...

Porous–vuggy carbonate reservoirs consist of both matrix and vug systems. This paper represents the first study flow issues within a porous–vuggy reservoir that does not introduce fracture system. The physical properties systems are quite different in vugs dispersed throughout reservoir. Assuming spherical vugs, symmetrically distributed pressure, centrifugal fluids considering media is directly connected with wellbore as system, we established solved model well testing rate decline analysis...

The no-type curve with negative skin of a horizontal well has been found in the current research. Negative is very significant to transient test and rate decline analysis. This paper first presents problem where type curves are oscillatory. In order solve problem, we propose new model analysis for multiple-zone composite reservoir. A dimensionless definition rD introduced mathematical modelling under different boundaries. solved using Laplace transform separation variables techniques. space,...

A new flow model in triple media carbonate reservoir is established. There exists a total system including the matrix, fracture and vug subsystem, three subsystems are relatively independent physical properties; process of oil flow, inter-porosity subsystem to would occur matrix also ignore between subsystem. Compared with traditional (the pseudo-steady), considers unsteady based on hypothesis that shape spherical. The illustrated solved, standard type curves drawn up, so characteristics...

In this work, an unsteady-state diffusion model was developed to describe gas transport in coal structures for horizontal well production. The assumes of through the matrix according Fick’s law, Darcy flow cleat network (natural fractures), and that adsorption can be described by Langmuir equation. Then using Laplace integral transformation solved. Using new model, dimensionless-type curves pressure-transient rate-decline analyses were used analyze transient characteristics. differences...

Abstract This study presents a general method for analyzing pressure buildup data from well located in multiwell reservoir, especially special case of test which the testing and adjoining wells are all shutting at same time. On this basis, effect interference on curve is analyzed. The obtained with superposition principle, dealing any combination producing, injecting or conditions wells. Pressure derivative log-log new type curves drawn up. Sensitivities affected by different...

Abstract This paper aims at triple porosity reservoir with fracture and vugs, according to basic percolation principle the nonlinear well testing model quadratic pressure gradient is established, considering wellbore storage skin, for both unsteady interporosity flow of matrix vugs fracture. By use variable substitution, linearizing equation, solved, Laplace space analytic solution obtained, then real procured by Stehfest numerical inversion. So derivative log-log new type curves are drawn...

A new transient-flow modelling of a multiple-fractured horizontal well is presented. Compared to conventional modelling, the considered more practical physical conditions, such as various inclined angles for different fractures, fracture intervals, lengths and partially penetrating fractures formation. kind mathematical method, including three-dimensional eigenvalue orthogonal transform, was created deduce exact analytical solutions pressure transients constant-rate production in real space....

It is extremely important to monitor the development of steam chambers in reservoirs process SAGD (Steam Assisted Gravity Drainage). By analyzing temperature data monitoring wells, extending velocity and direction chamber can be obtained, which helps regulate improve production effectively. Based on Stefan’s inverse problem, a mathematical model established this paper for acquiring by using wells. Mathematical methods are utilized solve such as Fourier transformation well an analytic...

The nonlinear dual-porosity flow model, specifically considering the quadratic pressure gradient term, wellbore storage coefficient, well skin factor, and interporosity of matrix to natural fractures, was established for production in a naturally fractured formation then solved using semianalytical method, including Laplace transform transformation function. Analytical solution model space converted numerical real Stehfest inversion. Nonlinear process with different external boundaries...

The steam chamber rising process is an essential feature of steam-assisted gravity drainage. development a and its production capabilities have been the focus various studies. In this paper, new analytical model proposed that mimics predicts oil rate during stage. was assumed to circular geometry relative plane. includes determining relation between capability. daily production, ratio, height curves influenced by different parameters were drawn. addition, curve sensitivities thoroughly...

Abstract Cainan oilfield is located in northwest China. The Jurassic sandstone reservoir with huge natural edge water and bottom energy began to put into production 1992 injection 1995. volume of about 35 times the reservoir. rate decline 1999, at present, very rapid, average cut 79.83% recovery 44.04%. There a most pressing problems needed address, which that influx how influence pressure system respectively, including maintenance level exhaustion level, etc. No engineering method found...

Water injection can compensate for pressure depletion of production. This paper firstly investigated into the equilibrium issue among water influx, and Equilibrium principle was elaborated through deduction equation presentation curves with an “equilibrium point”. Influences artificial controllable factors (e.g. well ratio to production total number) on were particularly analyzed using field data. It found that influences mainly reflected as location move point factor change. Then reservoir...

Abstract For the artificial water flooding development reservoir that maybe has strong natural edge and bottom water, it is very important to determine optimal well ratio of injection production considering influence influx in design plan. No good engineering method found it. A new practicable presented: can make being able obtain maximum ability liquid rate. According material balance principle, equal sum influx, so objective function amount rate established after a series deriving...