Method for determining annular gas-liquid interface of steam injection well
A liquid interface and steam injection technology, which is applied in earthwork drilling, wellbore/well components, special data processing applications, etc., can solve the problems of complex construction, large error, and long test period, and achieve high test accuracy and practicability Strong, Believable Effects
Active Publication Date: 2015-11-25
PETROCHINA CO LTD
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Problems solved by technology
Among them, the process of using buoys to detect the vapor-liquid interface in the buoy method is limited by the weight and volume of the buoys, and generally can only be used in annular wells and open wells where there is no pressure in the annular space of the oil casing.
The method of detecting the downhole gas-liquid interface of the oil well with the pressure gauge is basically the same as the pressure measurement method, and the gas-liquid interface is determined by the sudden change of the pressure gradient, but there are disadvantages of complex construction and long test period
The dynamometer diagram method uses the principle of the connected device. This method is simple to operate and low in cost, but it has the disadvantages of difficult data processing and large errors in the later stage.
[0005] Since the annulus of heavy oil steam injection wells has high temperature and high pressure, and the liquid in the annulus is high-temperature water, the temperature is generally above 100°C, the highest can reach 350°C, and the maximum pressure can reach above 10MPa. , construction difficulty, construction cost, and test accuracy are difficult to meet the requirements
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Embodiment 1
[0037] This embodiment provides a method for determining the air-liquid interface of the steam injection well ring, the specific process is as follows image 3 As shown, it is known that there is a steam injection well in a test block of Liaohe Oilfield, the well body structure data are shown in Table 1, and the steam injection parameter data are shown in Table 2.
[0038] Table 1 Wellbore structure data of a certain steam injection well
[0039] Set padding
4.60m
Oil make-up distance
4.28m
786.65m
Perforated section
802.5-850.2m
Thickness / layers
23.4m / 9 floors
maximum inclination
13°3′
the depth
925m
Artificial bottom
936.0m
Completion method
Perforation
Casing outer diameter
177.8mm
Casing inner diameter
161.7mm
Casing depth
934.45m
Drilling depth
940.0m
Inner pipe inner radius of heat insulation oil pipe
31mm ...
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The invention provides a method for determining an annular gas-liquid interface of a steam injection well. The method comprises the following steps: gas is injected annularly; when the pressure reaches 2 times of the annular pressure before the gas injection, the gas injection is stopped, and the volume of the injected gas is the volume of the annular gas; and the depth of the annular gas-liquid interface from the well opening to the liquid surface is obtained according to the volume of the annular gas, the inner diameter of a sleeve and the outer diameter of a heat insulating pipe or an oil pipe to finish the determination of the annular gas-liquid interface of the steam injection well. The method, provided by the invention, can accurately determine the distance of the gas-liquid interface to provide accurate and reliable technical parameter support for the removal of shaft collected liquid.
Description
technical field [0001] The invention relates to a method for determining the annular air-liquid interface, in particular to a method for determining the annular air-liquid interface of a steam injection well, and belongs to the technical field of petroleum exploitation. Background technique [0002] In the steam injection development process of heavy oil wells, in order to reduce the wellbore heat loss of steam injection wells, it is usually used to run the heat-insulated oil pipe and keep the heat-insulated oil pipe and casing annulus dry and clean for steam injection. The steam wellbore environment can ensure the minimum heat loss in the heat dissipation process of steam to the formation, and the highest thermal efficiency of steam injection. However, during the actual steam injection process of the oil well, due to the difficulty of removing the well flushing fluid and the leakage of the steam injection packer, there is mostly high-temperature water in the annulus of the ...
Claims
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IPC IPC(8): E21B43/24G06F17/50
Inventor 邓中先李树全金璐乔沐黄丽何金宝杨清玲王喆沈敏邓煜桐吴昊
Owner PETROCHINA CO LTD