Condensate Gas Reservoir Of Paraffin Wax Deposition Experiments And Field Application

The development of gas condensate reservoir under high temperature and high pressure is one of the concern points of the petroleum industry in our country nowadays. Besides those characters of general gas condensate reservoir, these reservoirs have its specialties. Because of the high temperature and pressure during the come to being process. The fluid of these reservoirs contains more paraffin and asphalt. Thereby, with the fall down of temperature and the volatilization of the light ends, paraffin will crystallize and deposit on the pipe wall. Which can reduce the effective flow area of the pipeline and even cause the shutting down of a well. Laboratorial test and field estimate of paraffin deposition can provide scientific,means and evaluate technique for the spot.By systemic researching and simulating experiment, the text gains such results as follows,1. On the base of sufficiency research on the oil-gas hydrocarbon systemic chemistry composing and the physical chemistry characters, we traverse the mechanism of the paraffin's deposition. Then we consider that paraffin deposition is a complex process ofphysical chemistry, which includes more than one single mechanism.2. Traversing and comparing the literature in detail on different factors that has effect on paraffin deposition, the available experimental methods on paraffin deposition, prevention of paraffin deposition, and removing of the deposited paraffin on the spot.3. Ameliorated the laser equipment of solid particle inspecting system and the corresponding test methods. Determine WCT (Wax Crystallize Temperature) of dead oil and live oil from KS101 well under different pressure with this system. The result implies that dead oil has opposite regulation on paraffin deposition temperature to live oil.4. A vapor-liquid-solid envelop is drawn by superposition regular vapor-liquid envelop and WCT curve thereby explained that the departure and quick raising of the curve in the low temperature zone is caused by the appearance of paraffin in solid phase.5. Estimation is made to determine the depth of paraffin deposition in the well. Based on the experience data and field production data, the result implied that paraffin deposition will outset only above the depth of 465m from the wellhead. These conclusions were confirmed during operation on the spot.6. The microstructure of dead oil is observed, whereupon paraffin-prevention solvent of KS101 well is selected.7. The melting temperature of paraffin under different pressure was determined for the first time in the world. And a hypothesis is put forward in the test that the crystallized wax in dead oil and live oil has the similar characters. The design on paraffin removal operation is made using the experimental data and the paraffin in pipeline is cleared effectively.