Horizontal well productivity prediction method based on formation energy lifting after volume fracturing
A prediction method and volume fracturing technology, which is applied in the directions of surveying, earthwork drilling and production, wellbore/well components, etc. It can solve the problem of finding the size and position of the area that is difficult to accurately obtain, and the position and area of the front that cannot enter the ground fluid. There is no systematic way to determine the filter loss coefficient, etc., so as 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 permea...
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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