A method for predicting the dynamic wax removal period of oil wells in offshore oilfields
An offshore oil field and prediction method technology, which is applied in the directions of surveying, earth-moving drilling, cleaning equipment, etc., can solve the problem that the dynamic wax deposition profile prediction and wax removal cycle prediction of wax deposition oil wells cannot be satisfied, and the wax removal cycle calculation method does not take into account. and other problems, to achieve the effect of multi-parameter sensitivity analysis and prediction, and improve the ability of prediction and analysis
Active Publication Date: 2022-05-03
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology
The above wax removal cycle prediction methods are mostly established based on the lifting process of pumping units, and the established wax removal cycle calculation methods do not take into account factors such as well type, temperature, pressure, gas-oil ratio, wax deposition profile, and liquid production. interdependent
[0004] Existing methods cannot meet the prediction of dynamic wax deposition profile and wax removal period of wax deposition oil wells lifted by offshore electric pump wells
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[0040] In order to further understand the invention content, characteristics and effects of the present invention, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:
[0041] The present invention provides a method for predicting the dynamic wax removal period of oil wells in offshore oilfields, wherein the basic parameters for the design of electric pump wells for wax deposition are shown in Table 1 and Table 2.
[0042] Table 1. High-pressure physical property parameters of formation fluids in target oilfields
[0043]
[0044] Table 2 Basic parameter list of wax deposition electric pump well design
[0045]
[0046] A method for predicting the dynamic wax removal period of oil wells in offshore oilfields, the calculation flow chart is as follows figure 1 As shown, it specifically includes the following steps:
[0047] Step S101: given the production parameters of the target well (that is, the liq...
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The invention discloses a method for predicting the dynamic paraffin removal period of oil wells in offshore oilfields. The steps are as follows: according to the liquid production rate, the characteristics of the pipe string and the parameters of the electric pump unit during the normal production of the given target well, and the initial assumption of the paraffin removal period time, iteratively Calculate the wellbore temperature profile from the wellhead down the wellbore, the amount of wax deposited along the wellbore and the wellbore fluid pressure at the pump discharge outlet in this period. In this period, the wellbore fluid pressure is pumped upward from the bottom of the wellbore, and the flow can be reversed by combining the electric pump characteristic curve. Through the liquid production rate of the electric pump, until the calculation of the initial liquid production rate under the influence of wax formation is close to the value of the liquid production rate deduced from the characteristic curve of the electric pump. Finally, iteratively calculate the comparison between the current effective liquid production rate and the initial liquid production rate, and if the initially set critical interference production percentage target is met, the calculation ends. The method of the invention solves the difficult problem of accurately predicting the wax removal period of the offshore electric pump wax deposition well, and can guide the formulation of the production system of the wax deposition well in the oil field.
Description
technical field [0001] The invention relates to oil field exploitation technology, in particular to a method for predicting the dynamic wax removal period of oil wells in offshore oil fields. Background technique [0002] Bohai heavy oil fields are characterized by high wax content and high wax precipitation temperature, and the number of oil fields with wax precipitation point temperature higher than 30°C accounts for 64.3%. Wellbore waxing occurs during development, and oil well waxing is seriously manifested in the decline of wellhead oil pressure, low production capacity, reduced efficiency of electric pumps, and easy blockage of wellbore. Taking X Oilfield in Bohai Sea as an example, there are 23 wells in total, 15 of which are open wells, and 7 wells have severe wax deposition. In order to alleviate the impact of wax deposition, wax removal process measures such as heating vehicle well, heat-insulated oil pipes, wax removal chemicals, and hollow rod electric heating h...
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IPC IPC(8): E21B47/00E21B37/00
CPCE21B37/00E21B47/00
Inventor 郑春峰杨万有李昂沈琼赵景辉张凤辉安程苏延辉
Owner CHINA NAT OFFSHORE OIL CORP