A method based on stability index to predict co 2 Method for scaling trend of gas drive wellbore
A stability index and fouling technology, applied in design optimization/simulation, etc., can solve problems such as unpredicted wellbore fouling trend
Active Publication Date: 2022-03-29
PETROCHINA CO LTD
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[0005] However many take CO 2 Oil and gas wells with gas flooding do not have wellbore scaling at the beginning, and subsequent CO 2 During the gas drive development process, due to changes in mining methods and work systems, fouling of wellbore and surface equipment affects production from time to time, and the existing technology does not predict CO 2 Method for scaling trend of wellbore in gas flooding oil and gas wells
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[0051] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0052] figure 1 The embodiment of the present invention provides a flowchart of a method for predicting the fouling tendency of a wellbore using the Ryznar stability index theory method in the prior art. Such as figure 1 As shown, the method includes:
[0053] S101, collecting a water sample in the wellbore, and detecting the temperature a...
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The invention provides a method for predicting CO based on the stability index 2 The method of gas drive wellbore fouling tendency, this method collects water sample analysis data, according to wellbore temperature and pressure conditions and the concentration of known ions, relies on the Ryznar stability index theory to calculate the CO when there is a fouling trend under the wellbore conditions. 3 2‑ 、HCO 3 ‑ Concentration, and plot the CO when calcium carbonate scale is generated under the wellbore temperature and pressure conditions 3 2‑ 、HCO 3 ‑ Concentration curve, by CO in wellhead produced water 3 2‑ 、HCO 3 ‑ The concentration is detected, and when the predicted value is reached, corresponding cleaning and anti-scaling measures are taken. Realized that existing scaling prediction methods cannot predict CO 2 Due to the limitation of the scaling trend in the wellbore of gas flooding oil and gas wells, this method is applied to the prevention and treatment of calcium carbonate scale in the unscaled wellbore, which can accurately predict the CO 2 Wellbore fouling trend of gas flooding oil and gas wells, and then formulate a reasonable plan for cleaning and preventing fouling.
Description
technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a method for predicting CO based on a stability index. 2 A method for scaling trends in gas drive wellbore. Background technique [0002] In the process of oilfield exploitation, especially in the period of high water-cut oil production, some oil wells will be fouled. Scaling in oil wells will block pipelines and cause production decline, which has become one of the important factors that plague oilfield production. Calcium carbonate scale is a common scale in most blocks. The mechanism of calcium carbonate scaling has been studied in depth at home and abroad. The scaling mechanism is Ca in water. 2+ with CO 3 2- CaCO 3 precipitation. [0003] Calcium Carbonate (CaCO 3 ) scale is a very common scale in oilfield production. Generally, its solubility increases with increasing salinity in water; increasing temperature and decreasing pressure will reduce...
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IPC IPC(8): G06F30/20
Inventor 刘己全潘昭才王茜孟祥娟刘举
Owner PETROCHINA CO LTD