You can easily use the discrete feature elements in FEFLOW for this purpose. Just put 1D elements for the bores of the horizontal well (or 'Ranney' well), and put the total abstraction as a well boundary condition to the central shaft.
Please note that the FEFLOW Web Forum is a user community, and all the forum members provide answers to your questions voluntarily. Therefore it can easily be the case that you do not get an answer in an instant. The more specific your question is, and the more the others have the impression that you are also willing to share your knowledge, the higher the probability that someone helps you soon.
Before starting a new thread, please use the search function. Looking for 'horizontal well', you can easily find the following thread: http://feflow.info/forum/index.php/topic,64.0.html