Thermal Recovery Of Non-newtonian Filtration Test Analysis

In company with our country oilfield entering the medium and late stage of recovery, the continual requirement of energy enlarging and oil and gas exploration impenetrating, it is more and more important to explore the unconventional oil-gas reservoir. Because of its huge reserves, heavy oil has significant practical significance to improve our country's energy structure and remit the petroleum supply and demand's pressure. Different from the conventional oil reservoir, the rheological characteristics of the heavy oil belongs to the kind of non-Newtonian fluid because it contains high molecular polymer, such as gum, pitch, wax etc, whereas assume the seeping characteristics of non-Newtonian which cause heavy oil's exploitation more difficult than the conventional method. At present, it is widely adopted the thermodynamic method exploitation. Transient testing of heavy oil reservoir is a kind of extensively used method for obtaining formation characteristics, it is a important method to guide and monitor heavy oil recovery. At present this kind of research is merely based on general Newtonian fluid composite model. Owing to the seeping discipline's complexity of heavy oil reservoir fluid, it causes prodigious deviation by adopting well testing method of conventional Newtonian fluid and the practical application also has the very big limitation. Therefore it is insignificant to develop the transient well test analysis theory and the explanation method of heavy oil thermal recovery, To establish the adaptive well test model and consummate analytical method for seeking the heavy oil reservoir's natural parameter and offering technical support for productive capacity evaluation.This article is based on the widespread investigation and study and the earnest analysis of the domestic and foreign non-Newton well test literature. It accumulates in the research results of the predecessor and points to the steam-stimulated well's problem of thermal recovery's well testing, and then carrys out systemic research. It derives in detail and establishes the well test interpretation model from microscopic mechanism of seeping acquirement, and finds out the correspondence model's solution and figures out the corresponding type curves. At the same time, it gets the flowing rate dynamic law analyses at the condition of bottom hole pressure for steam soak well.The main works mentioned in the article are: (1) to carry out certain research to Newtonian seeping mechanism and rheological property and infer the transfusion partial differential equation of the non-Newton heavy oil in the porous medium detailedly. (2) to establish well test model of two-zone composite reservoir that considering non-newtonian power-law fluid in outer region, the loss of heat, wellbore storage coefficient, skin effect and additional pressure fall, solve on occasions of the outer boundary is infinity, roundness enclosed and roundness constant pressure. figure out the corresponding type curves and carry out sensibility analysis.(3) to establish well test model of three-zone composite reservoir that considering non-newtonian power-law fluid in outer region, the loss of heat, wellbore storage coefficient, skin effect and additional pressure fall, solve on occasions of the outer boundary is infinity, roundness enclosed and roundness constant pressure. figure out the corresponding type curves and carry out sensibility analysis.(4) to establish well test model of two-zone double porosity media composite reservoir that considering non-newtonian power-law fluid in outer region ,the loss of heat, wellbore storage coefficient, skin effect and additional pressure fall, solve on occasions of the outer boundary is infinity, roundness enclosed and roundness constant pressure. figure out the corresponding type curves and carry out sensibility analysis.(5) to establish the well test model of two-zone composite reservoir that outer region is fulled with the fluid with starting pressure gradient considering the loss of heat, wellbore storage coefficient, skin effect and additional pressure fall, solve on occasions of the out boundary is infinity, roundness enclosed and roundness constant pressure. figure out the corresponding type curves and carry out sensibility analysis. (6) to establish above composite reservoir's mathematical models of production decline at the condition of constant wellbore pressure,get sensibility analysis of relevant parameters to pool production rate's decline curve.