A productivity prediction method for horizontal wells based on formation energy uplift after volume fracturing
A technology of volume fracturing and prediction method, which is applied in the directions of measurement, earthwork drilling and production, wellbore/well components, etc. Problems such as the determination of the position and area of the ground fluid wave and the front edge can be solved to solve the unpredictable effect
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Embodiment 1
[0042] This embodiment provides a horizontal well productivity prediction method based on formation energy lift after volume fracturing, including the following steps:
[0043] Step 1) Obtain the total fluid loss coefficient C of the fracturing fluid during the fracturing process 总 and formation closure stress p cl ;
[0044] Step 2) Determine the fluid loss coefficient C of the fluid loss zone through the core fluid loss test in the fracturing fluid chamber 3 ;
[0045] Step 3) Determine the fracture length L of the horizontal well pressure fracture f ;
[0046] Step 4) Using the fluid loss equation and the unstable seepage equation group, establish a fracturing fluid fluid loss propagation model, and solve the distance and pressure distribution of the single-stage fracturing invasion zone and the compression zone at different times;
[0047] Step 5) Use the area integral to integrate the pressure distribution of each section to obtain the average formation pressure p L...
Embodiment 2
[0058] On the basis of Embodiment 1, this embodiment provides a horizontal well productivity prediction method based on formation energy lift after volume fracturing, and the expression of the fluid loss equation is:
[0059] 1 / C 总 =1 / C 1 +1 / C 2 +1 / C 3
[0060] In the formula, C 总 Indicates the total filter loss coefficient, unit C 1 Indicates the fluid loss coefficient of the compressed area of the reservoir, unit C 2 Indicates the invasion zone filtration coefficient, unit C 3 Indicates the filter loss band filter loss coefficient, unit
[0061] The expression of the unstable seepage equations is:
[0062]
[0063] where: η 1 =k / (c 1t mu a ), η 2 =k / (c 2t mu r ),c 1t = c f1 +φc m ,c 2t = c f2 +φc m , η 1 is the transmissive coefficient of the intrusion zone; η 2 is the pressure conductivity coefficient of the reservoir area; x c (t) is the distance from the edge of the intrusion zone to the fracture at time t, in m; k is the formation perm...
Embodiment 3
[0070] On the basis of Example 2, this example provides a horizontal well productivity prediction method based on formation energy lift after volume fracturing, the fluid loss equation where: Δp w =p w -p v , Δp v =p v -p c , Δp c =p c -p 0 , k represents formation permeability, unit is mD; φ represents formation porosity, decimal; μ aIndicates the viscosity of the fracturing fluid, in mPa·s; μ r Indicates formation crude oil viscosity, unit is mPa s; p w Indicates the pressure inside the fracture, the unit is MPa; p v Indicates the contact surface pressure between the fluid loss zone and the invasion zone, in MPa; p c Indicates the contact surface pressure between the invasion zone and the reservoir fluid compression zone, in MPa; p 0 Indicates the original formation pressure of the reservoir, in MPa; C 3m Indicates the fluid loss coefficient of the fracturing fluid invasion experiment, the unit is Δp m Indicates the fluid loss pressure difference in the fr...
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