FRACTURE STIMULATION FOR TIGHT GAS RESERVOIR

This project was a study on tight gas reservoir. Tight gas reservoirs have been
known to be difficult to produce due to its low permeability. And several studies had
been made on fracture stimulation so that this tight gas reservoir productivity can be
increased. Because of that, this project will be on fracture stimulation for tight gas
focusing on the proppant diameter. In fracture stimulation, several fracture
parameters plays a vital role in improving the production of a reservoir. We need to
identify the fracture half length and dimensionless fracture conductivity that can
generate a high absolute permeability and also the proppant median diameter for
doing the fracturing job.
Thus, the objectives of this project were to determine and analyze the value
of dimensionless fracture conductivity that can result in a high value of fracture half
length which will be used for doing simulation with 4 different sizes of proppant
(median diameter) and its permeability on the production responses. In the early
stage of this project, research will be done on tight gas reservoir, and fracture
stimulation. After that, the reservoir parameters including the rock, fluids, and PVT
parameters that is needed to do the simulation will be constructed as our input. This
project requires the use of software (WellFlo) to do simulation on the fracture.
After the project had been conducted it' was acquired that the fracture halflength
will increase as we decrease the FCD, thus we had chosen FCD = 1 to be used
for doing simulation using the WellFlo. Using this value of FCD, the simulation on
fracturing is conducted to see the trend of AOF after we had introduce fracturing
using different size of proppant median diameter. As the end result, the value of
proppant median diameter chosen is 0.69lmm as it gave us the highest value of AOF
where the AOF increases from 50.299MMscf/d before fracture to 140.385MMscf/d
after fracture.
As the conclusion, the productivity of the tight gas reservoir can be enhanced
by conducting fracture stimulation on the reservoir and it depends on several fracture
parameters such as the dimensionless fracture conductivity, fracture half-length,
fracture width, proppant permeability, proppant median diameter and etc.