Productivity index formula oil well
Productivity index (J) The productivity index is a measure of the well potential or ability to produce and is a commonly measured well property 1 . The symbol J is commonly used to express the productivity index; as well as, being the preferred symbol by the Society of Petroleum Engineers. Productivity Index is the measure of the ability of a well to produce hydrocarbons at a commercial rate. Estimating Productivity Index is one of the necessary and very important steps once the production from an oil or gas well starts. Productivity index tells the operator about the performance of an oil well. It is commonly denoted by “Pi or J”. productivity index (PI) 1. n. [Well Completions] A mathematical means of expressing the ability of a reservoir to deliver fluids to the wellbore. The PI is usually stated as the volume delivered per psi of drawdown at the sandface (bbl/d/psi). Thanks to the low productivity index (PI) of the oil wells in ultralow-permeability reservoirs, the flowing pressure should be kept low while the pressure drawdown is increased to maintain the wells’ outputs. However, for reservoirs with relatively high saturation pressure, the degassing radius of the oil well will extend and the conditions for liquid flow in oil layers and the bore hole will become worse if the pressure drawdown is too much lower than the saturation pressure, which will Various methods of determining the ability of an oil well to produce are discussed. The \"productivity index,\" which is defined as the barrels of oil produced per day per pound differential between static and flowing bottom hole pressure, is discussed; and methods of determining it are outlined. The well's productivity index (PI or J is common) is: Under pseudo-steady state (pss) , a calculated PI is: The effective permeability-thickness in md-ft ( ) and skin ( s ) are estimated based on well test analyses. The constant productivity index concept is only appropriate for oil wells producing under single-phase flow conditions, pressures above the reservoir fluid’s bubblepoint pressure. For reservoir pressures less than the bubblepoint pressure, the reservoir fluid exists as two phases, vapor and liquid, and techniques other than the productivity index must be applied to predict oilwell performance.
Productivity index in horizontal wells Charles Ibelegbu Department of Petroleum & Gas Engineering, University of Port Harcourt, Nigeria Received 19 September 2003; accepted o4 November 2004 The study investigates the effect of reservoir and well parameters on the Productivity Index (PI) of a well. It analyses
ABSTRACT Various methods of determining the ability of an oil well to produce The \"productivity index,\" which is defined as the barrels of oil produced per day per that the several factors be given proper weight in the allocation formula. For a water-free oil production, the productivity index is given by: It is important to note that the productivity index is a valid measure of the well productivity 24 Dec 2012 While these concepts will be dealt with extensively in subsequent chapters, it is useful here to present the productivity index, J, of an oil well Keywords: Productivity index, Horizontal wells In many oil and gas wells, the observed flow rate steady state flow, the oil flow rate can be calculated as3: 0. A Novel Model of Productivity Analysis and Forecasting for Oil-gas Well We calculate the fluid productivity index firstly and then calculate the unknown set of The modified formulas for the composite IPR curves based on Petrobras method.
for calculation of horizontal well productivity: analytical and semi-analytical models. Borisov [4] developed one of the earliest analytical models for calculating steady state oil production from a horizontal well. The horizontal flow was assumed from an equivalent circular drainage area toward a vertical
IBELEGBU: PRODUCTIVITY INDEX IN HORIZONTAL WELLS 981 where a = 2 L 0.5 2 4 4 1 2 1 + + L reh …(11) reh = a'b …(12) where a’ and b are the major and minor radii of a drainage ellipse. Assuming that a horizontal well drains in an elliptical pattern in the horizontal plane The Productivity Index trend of the gas well is evaluated from the test data. Regression Analysis is used to develop a correlation, which is then used to evaluate andforecast future Productivity Index trend. The back pressure equation of the Simplified Analysis method is also used to examine the test data. Productivity Index and IPR A commonly used measure of the ability of the well to produce is the Productivity Index. Defined by the symbol ‘J’. The productivity index is the ratio of the total liquid flow rate to the pressure drawdown. For a water-free oil production, the productivity index is given by: Production Index (PI) Maturity of a homogeneous source section can be accessed from the production index (PI). PI is calculated from Rock-Eval data: where S1 is the quantity of free hydrocarbons (gas + oil), in mg/g of rock and S2 is the quantity of thermally generated (cracked) hydrocarbons, in mg/g of rock . Horizontal well productivity index under steady state flow. The Joshi method for well in an anisotropic reservoir, [STB/(d.psi)] 153 ProdIndexHorWellRD: WellFlow: Horizontal well productivity index under steady state flow. The Renard-Dupuy method for well in an anisotropic reservoir, [STB/(d.psi)] 154 ProdIndexHorWellBO The formula assumes single phase flow (i.e., water injection into a water zone with Sw = 1). If the injection is into a water swept oil zone, kw is the effective permeability to water, i.e., kw = k krw(Sw) which can be considerably lower compared to absolute permeability k.
15 May 2015 to the problem in order to increase the well's productivity because a well In reality, the drilling and completion of oil and gas wells for production flow rate of 29stb/d and productivity index increase from 0.9626– 1.9582 stb/d/psi. Also, calculation of the pressure drop should not be accounted for by only
ON CALCULATION OF SLANT WELL PRODUCTIVITY INDEX IN NUMERICAL Slant well is a non-vertical form of wells used typically for extracting oil and Learn calculation method for IPR using flow capacity from well log analysis results. STEP 1: Productivity index Qo = productivity oil (bbl/day or m3/day) The classic well inflow equation gives the productivity index for oil in terms of the reservoir permeability, thickness, viscosity, shrinkage and geometric flow factor. Equation 3 Calculation and Data analysis: After gathering Data by questionnaire, performance, input energy and energy productivity index and also, mean Oil Gas Res 3: 138. doi: 10.4172/2472-0518.1000138. Copyright: Ep: Error in productivity calculation for both vertical tubing and the drain hole;. Js: Specific productive index, STB/day/Psi/ft;. J: Horizontal well productivity index, STB/day/ Psi;.
Productivity Index. A commonly used measure of the ability of the well to produce is the Productivity Index. Defined by the symbol J, the productivity index is the ratio of the total liquid flow rate to the pressure drawdown. For a water-free oil production, the productivity index is given by: where.
Equation 3 Calculation and Data analysis: After gathering Data by questionnaire, performance, input energy and energy productivity index and also, mean Oil Gas Res 3: 138. doi: 10.4172/2472-0518.1000138. Copyright: Ep: Error in productivity calculation for both vertical tubing and the drain hole;. Js: Specific productive index, STB/day/Psi/ft;. J: Horizontal well productivity index, STB/day/ Psi;. ial equipment for determining fluid levels in oil wells. application to the usage of the productivity index theory. The use of charts facilitates the calculation. However, the existing methods for the productivity calculation are based on the For an oil well, the dimensionless productivity index in the wellbore is. 2. D w q.
pressure losses on productivity index of long horizontal well was developed. Results 6 In oil and gas recovery because of the ability of horizontal weJ] to. 7 produce with a this calculation, a main assumption is that there is no pressure dif. trajectory. Keywords: Horizontal well, Productivity index, Non-linear trajectory. 1. of oil delivered to the wellbore per unit pressure drop across the producing formation This calculation was done for varying anisotropy and eccentricity to. ∑. ON CALCULATION OF SLANT WELL PRODUCTIVITY INDEX IN NUMERICAL Slant well is a non-vertical form of wells used typically for extracting oil and Learn calculation method for IPR using flow capacity from well log analysis results. STEP 1: Productivity index Qo = productivity oil (bbl/day or m3/day) The classic well inflow equation gives the productivity index for oil in terms of the reservoir permeability, thickness, viscosity, shrinkage and geometric flow factor. Equation 3 Calculation and Data analysis: After gathering Data by questionnaire, performance, input energy and energy productivity index and also, mean