Unconventional well gas to oil ratio characterization

Abstract

A method of reducing gas flaring through modelling of reservoir behavior using a method of optimizing oil production from one or more well(s) in a reservoir, the method providing a model of the well, inputting well data for a one or more well(s) into the model, the well data selected from geological layers, reservoir properties, fracturing data, completion data, permeability data, geochemistry, and combinations thereof. Inputting historical production data from one or more well(s) into the model, the historical data selected from PVT data, BHP, oil production rates, gas production rates and water production rates, or combinations thereof. Controlling the model to match one or more parameters selected from production rates, gas to oil ratio (GOR), bottom hole pressure (BHP), cumulative oil production (COP), or a combination thereof in a probabilistic manner to obtain a plurality of historical models. Verifying one or more test models against the historical models to identify an optimal model with minimum error. Using the optimal model to predict one or more parameters selected from production rates, gas to oil ratio (GOR), bottom hole pressure (BHP), cumulative oil production (COP), or a combination thereof from the well into a future. Optimizing a production plan using the predicted parameters and implementing the optimized production plan in said well, whereby oil production is optimized as compared to a similar well produced without the optimized production plan.

What is claimed: 
     
         1 ) A method of optimizing oil production from one or more well(s) in a reservoir, said method comprising:
 a) providing a model of one or more well(s) in a reservoir;   b) inputting well data into said model, said well data selected from geological layers, reservoir properties, fracturing data, completion data, permeability data, geochemistry, and combinations thereof;   c) inputting historical production data from said one or more well(s) into said model, said historical data selected from PVT data, BHP, oil production rates, gas production rates, water production rates, and combinations thereof;   d) controlling said model to match one or more parameters selected from production rates, gas to oil ratio (GOR), bottom hole pressure (BHP), cumulative oil production (COP), and combinations thereof, in a probabilistic manner to obtain a plurality of historical models;   e) verifying one or more test models against said plurality of historical models to identify an optimal model with minimum error;   f) using said optimal model to predict one or more parameters selected from production rates, gas to oil ratio (GOR), bottom hole pressure (BHP), cumulative oil production (COP), and combinations thereof from said well into a future;   g) optimizing a production plan using said predicted parameters;   h) implementing said optimized production plan in said well, whereby oil production is optimized as compared to a similar well produced without said optimized production plan.   
     
     
         2 ) The method of  claim 1 , wherein said reservoir is an unconventional reservoir. 
     
     
         3 ) The method of  claim 1 , wherein said reservoir is a hybrid shale and limestone reservoir. 
     
     
         4 ) The method of  claim 1 , wherein said model in a) has finer gridding near said one or more well(s). 
     
     
         5 ) The method of  claim 4 , wherein said finer gridding is Tartan gridding. 
     
     
         6 ) The method of  claim 1 , wherein said optimized reservoir plan includes reduced drawdown to reduce GOR. 
     
     
         7 ) The method of  claim 1 , wherein said optimized reservoir plan includes widening fracture cluster spacing to reduce GOR. 
     
     
         8 ) The method of  claim 1 , wherein said optimized reservoir plan includes recharging high GOR parent wells with offset child well fracture hits to reduce GOR. 
     
     
         9 ) The method of  claim 1 , wherein said optimized reservoir plan includes extending well shut-in time to reduce GOR. 
     
     
         10 ) A method of reducing GOR in oil production from one or more well (s) in a reservoir, said method comprising:
 a) providing a model of one or more well(s);   b) inputting well data into said model, said well data selected from geological layers, reservoir properties, fracturing data, completion data, permeability data, geochemistry, and combinations thereof;   c) inputting historical production data from said one or more well(s) into said model, said historical data selected from PVT data, BHP, oil production rates, gas production rates, water production rates, and combinations thereof;   d) controlling said model to match one or more parameters selected from production rates, gas to oil ratio (GOR), bottom hole pressure (BHP), cumulative oil production (COP), or combinations thereof in a probabilistic manner to obtain a plurality of historical models;   e) verifying one or more test models against said historical models to identify an optimal model with minimum error;   f) using said optimal model to predict gas to oil ratio (GOR) from said one or more well(s) into a future;   g) optimizing a production plan using said predicted GOR to reduce gas production;   h) implementing said optimized production plan in said reservoir, whereby GOR is reduced as compared to said predicted GOR.   
     
     
         11 ) The method of  claim 10 , wherein said reservoir is an unconventional reservoir. 
     
     
         12 ) The method of  claim 10 , wherein said reservoir is a hybrid shale and limestone reservoir. 
     
     
         13 ) The method of  claim 10 , wherein said model in a) has finer gridding near said well. 
     
     
         14 ) The method of  claim 13 , wherein said finer gridding is Tartan gridding. 
     
     
         15 ) The method of  claim 10 , wherein said optimized reservoir plan includes reduced drawdown to reduce GOR. 
     
     
         16 ) The method of  claim 10 , wherein said optimized reservoir plan includes widening fracture cluster spacing to reduce GOR. 
     
     
         17 ) The method of  claim 10 , wherein said optimized reservoir plan includes recharging high GOR parent wells with offset child well fracture hits to reduce GOR. 
     
     
         18 ) The method of  claim 10 , wherein said optimized reservoir plan includes extending well shut-in to reduce GOR. 
     
     
         19 ) The method of  claim 10 , wherein said optimized reservoir plan includes one or more of:
 a) reduced drawdown to reduce GOR;   b) widening fracture cluster spacing to reduce GOR;   c) recharging high GOR parent wells with offset child well fracture hits to reduce GOR;   d) extending well shut-in to reduce GOR;