Abstract: It is thought that the steam diffuses uniformly into reservoirs in injection of horizontal well in heavy oil reservoir with thermal recovery, and the formula of MaxLangenheim is simply used to calculate the heating areas, but the study of the authors of the paper indicates that the steam diffused as some mathematical distribution, and the velocity of steam injection is in connection with reservoir parameters, the steam injection ability of formations and physical property parameters of steam, i.e, the injection pressure of steam has something to do with the injection fluid rate, there is a mathematical relationship between them. The authors study the steam injection ability, and set up a steam injection model for horizontal well in heavy oil with thermal recovery. The effect of heat exchange is consideres in the model, also the effect of steam intrinsic energy and friction loss. Then, a software (HHTS) is developed on the basis of this model, and the Leng 42 block of Liaohe oil field is calculated with the software, it can provide theoretical references for heavy oil with thermal recovery and horizontal well design parameters.

Key words: heavy oil, horizontal well, thermal recovery, steam injection ability, mathematical model