Oil well heat tracing production judgment method
A technology for oil wells and crude oil, which is applied in the field of heat tracing production judgment of oil wells, and can solve problems such as inability to judge heat tracing production of oil wells, insufficient heat exchange, and large production
Pending Publication Date: 2021-10-26
PETROCHINA CO LTD
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[0002] At present, there are many thermal recovery wells in some oilfields in my country that have not been installed with heat tracing measures due to cable damage, but they can still produce normally. The reason is that some wells have entered a stage of high water cut, and the water cut has exceeded 95%. During the flow of the wellbore, the oil-water mixture flows in the form of oil in water, and the viscosity is low without heat tracing production; due to the large production of some thermal recovery wells, the heat exchange with the formation is not sufficient during the flow of the wellbore, and the crude oil itself remains Higher temperature, lower viscosity and production without heat tracing
The currently commonly used freezing point test method cannot simulate the viscosity change of crude oil during wellbore flow under different fluid production and water content conditions, so it is impossible to judge whether the oil well needs heat tracing production
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[0034] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0035] A method for judging oil well heat tracing production, comprising the following steps:
[0036] Step 1. Measure the viscosity of the crude oil sample produced at the wellhead of the oil well at intervals of the first set temperature and the first set time;
[0037] Step 2, make the temperature and viscosity relation curve of this crude oil sample;
[0038] Step 3, finding the temperature corresponding to the inflection point of the temperature-viscosity relationship curve, which is the dynamic freezing point;
[0039] Step 4. Determine whether the oil well needs heat tracing production, such as figure 1 shown.
[0040] In step 1, the first set temperature is 1°C, that is, the viscosi...
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The invention discloses an oil well heat tracing production judgment method. The method comprises the following steps of S1, measuring the viscosity of a crude oil sample output from a wellhead of an oil well at an interval of first set temperature and first set time; S2, making a temperature and viscosity relation curve of the crude oil sample; S3, finding out the temperature corresponding to the inflection point of the temperature and viscosity relation curve, wherein the temperature is a dynamic freezing point; and S4, judging whether the oil well needs heat tracing production or not. According to the oil well heat tracing production judgment method, the dynamic freezing point of crude oil in the shaft flowing process under the conditions of different liquid production capacities and water contents can be determined, and whether the oil well needs heat tracing production or not is determined according to the relation between the dynamic freezing point and the wellhead temperature.
Description
technical field [0001] The invention relates to the technical field of oil exploitation, in particular to a method for judging oil well heat tracing production. Background technique [0002] At present, there are many thermal recovery wells in some oilfields in my country that have not been installed with heat tracing measures due to cable damage, but they can still produce normally. The reason is that some wells have entered a stage of high water cut, and the water cut has exceeded 95%. During the flow of the wellbore, the oil-water mixture flows in the form of oil in water, and the viscosity is low without heat tracing production; due to the large production of some thermal recovery wells, the heat exchange with the formation is not sufficient during the flow of the wellbore, and the crude oil itself remains Higher temperature, lower viscosity also does not require heating production. The currently commonly used freezing point test method cannot simulate the viscosity chang...
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Login to View More IPC IPC(8): E21B49/00G06F30/20E21B43/24
CPCE21B49/00E21B43/24Y02E10/10
Inventor 蔡龙浩李学良张朝生李延年李博李昕宇解峰张挺张俊何平程维华赵萌李云翱伊宏亮杨丰鸣郑健方梁锋仲超朱涛何远哲
Owner PETROCHINA CO LTD