a forecast co 2 Method for scaling trend of wellbore in gas flooding oil and gas wells
A technology for oil wells and gas flooding, applied in wellbore/well components, surveying, earthmoving, etc., to solve the problem of unpredictable wellbore scaling trends, etc.
Active Publication Date: 2022-03-01
PETROCHINA CO LTD
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Problems solved by technology
[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 trend of a wellbore using the Davis-Stiff saturation index 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 and p...
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The present invention provides a method for predicting CO 2 The method for the fouling trend in the wellbore of gas flooding oil and gas wells. This method analyzes the data by collecting water samples, and calculates the fouling under the wellbore conditions according to the temperature and pressure conditions of the wellbore and the concentration of known ions, relying on the Davis-Stiff saturation index theory through the iterative method of trial calculation. CO 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 scaling trend in wellbore of gas flooding oil and gas wells, applying this method to the prevention and treatment of calcium carbonate scale in non-scaling wellbore can accurately predict 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 2 A method for wellbore scaling trends in gas flooding oil and gas wells. 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 its so...
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IPC IPC(8): E21B43/16E21B49/08E21B47/00
CPCE21B43/164E21B43/168E21B49/08E21B47/00
Inventor 王茜潘昭才刘己全孟祥娟刘举张宝曾努易俊秦曼吴燕胡超王宏宇张宏强易飞钟博文邓川庹维志王方智
Owner PETROCHINA CO LTD