METHOD FOR LAB-SCALE HYDRAULIC FRACTURE ANALYSIS
Examples of methods and systems for predicting a predicted breakdown pressure for a wellbore are disclosed. The methods include obtaining a set of wellbore length compensating breakdown pressure correction curves and obtaining an approximate breakdown pressure, wherein the approximate breakdown pressure is based, at least in part, on measurements taken in a laboratory-scale wellbore. The methods further include determining a predicted breakdown pressure from the approximate breakdown pressure and the set of wellbore length compensating breakdown pressure correction curves, where the predicted breakdown pressure predicts the breakdown pressure of a reservoir-scale wellbore.
1 . A method for predicting a predicted breakdown pressure for a wellbore, comprising:
obtaining a set of wellbore length compensating breakdown pressure correction curves;
obtaining an approximate breakdown pressure,
wherein the approximate breakdown pressure is based, at least in part, on measurements taken in a laboratory-scale wellbore; and
determining a predicted breakdown pressure from the approximate breakdown pressure and the set of wellbore length compensating breakdown pressure correction curves,
wherein the predicted breakdown pressure predicts the breakdown pressure of a reservoir-scale wellbore.
2 . The method of claim 1 , wherein the set of wellbore length compensating breakdown pressure correction curves are determined using numerical simulation for a plurality of nominal rock parameters and nominal wellbore parameters.
3 . The method of claim 1 , wherein the measurements comprise a plurality of observed rock parameters and observed wellbore parameters.
4 . The method of claim 3 , wherein obtaining an approximate breakdown pressure further comprises predicting the approximate breakdown pressure using a breakdown pressure prediction model and the plurality of observed rock parameters and observed wellbore parameters.
5 . The method of claim 4 , wherein the breakdown pressure prediction model comprises a Hubbert-Willis model.
6 . The method of claim 1 , further comprising determining a well construction plan based, at least in part, on the predicted breakdown pressure.
7 . The method of claim 6 , further comprising hydraulically fracturing a well guided by the well construction plan.
8 . The method of claim 1 , wherein determining a predicted breakdown pressure further comprises interpolating between points in the set of wellbore length compensating breakdown pressure correction curves.
9 . The method of claim 2 , wherein numerical simulation comprises numerical solutions to a system of poroelastic equations.
10 . The method of claim 1 , wherein the set of wellbore length compensating breakdown pressure correction curves comprises a wellbore length compensating breakdown pressure correction curve for each of a plurality of doublets comprising a normalized wellbore length and a normalized injection rise-up time.
11 . A system, comprising:
a laboratory-scale wellbore analysis system configured to measure a plurality of observed rock parameters and observed wellbore parameters of a laboratory-scale wellbore within a rock sample; and
a computer system configured to:
obtain a set of wellbore length compensating breakdown pressure correction curves;
receive the plurality of observed rock parameters and observed wellbore parameters measurements taken in a laboratory-scale wellbore;
determine an approximate breakdown pressure based, at least in part, on the plurality of observed rock parameters and observed wellbore parameters measurements taken in a laboratory-scale wellbore; and
determine a predicted breakdown pressure from the approximate breakdown pressure and the set of wellbore length compensating breakdown pressure correction curves,
wherein the predicted breakdown pressure predicts the breakdown pressure of a reservoir-scale wellbore.
12 . The system of claim 11 , wherein the set of wellbore length compensating breakdown pressure correction curves are determined using numerical simulation for a plurality of nominal rock parameters and nominal wellbore parameters.
13 . The system of claim 11 , wherein predicting the approximate breakdown pressure further comprises using a breakdown pressure prediction model and the plurality of observed rock parameters and observed wellbore parameters.
14 . The system of claim 13 , wherein the breakdown pressure prediction model comprises a Hubbert-Willis model.
15 . The system of claim 14 , wherein the computer system is further configured to determine a well construction plan based, at least in part, on the predicted breakdown pressure.
16 . The system of claim 15 , further comprising a hydraulic fracturing system configured to hydraulically fracture a well guided by the well construction plan.
17 . The system of claim 11 , wherein determining a predicted breakdown pressure further comprises interpolating between points in the set of wellbore length compensating breakdown pressure correction curves.
18 . The system of claim 12 , wherein numerical simulation comprises numerical solutions to a system of poroelastic equations.
19 . The system of claim 11 , wherein the set of wellbore length compensating breakdown pressure correction curves comprises a wellbore length compensating breakdown pressure correction curve for each of a plurality of doublets comprising a normalized wellbore length and a normalized injection rise-up time.
20 . The system of claim 11 , wherein the laboratory-scale wellbore analysis system is configured to raise a fluid pressure within the laboratory-scale wellbore while constraining applying stresses along at least one axis of the rock sample.