Heavy oil multiphase thermal huff and puff oil recovery method
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A thermal and heavy oil technology, applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve problems such as difficult recovery and low recovery rate
Inactive Publication Date: 2012-03-07
大庆黑帝庙稠油试采技术开发有限公司
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[0003] In order to overcome the disadvantages of the existing steam huff and puff oil recovery method that is far away from the near-well zone, it is not easy to recover due to temperature drop, and the recovery rate is low, the present invention provides a heavy oil multiphase thermal huff and puff oil recovery method, which has the following advantages: Features of high recovery rate and good oil displacement effect far away from near-wellbore zone
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Embodiment 1
[0017] Example 1: Well Puqian-20
[0018] The well has been huff and puffed for 7 rounds, and the cumulative injection of steam in the last round of huff and puff was 1047 m 3 , producing liquid 1560 m 3 , the cumulative oil production is 156 m 3 , the oil-gas ratio is 0.15, and the production-injection ratio is 1.49;
[0019] This round first injects steam for 200 m 3 , and then inject N at the same time as steam 2 and CO 2 , After co-injecting for one day, start injecting high-temperature foaming agent, inject 1 ton / day for 3 consecutive days, stop foaming agent injection, steam + N 2 +CO 2 Continue to inject until the injection pressure reaches 7.5MPa and stop the injection. When the injection is stopped, the cumulative injection of steam is 821 m 3 , the cumulative injection of N 2 and CO 2 63000Nm 3 ; After the injection, the well was held for 3 days, the pressure was reduced from 7.5 MPa to 3 MPa, and oil production began, with an initial liquid production of ...
Embodiment 2
[0020] Example 2: Well Puqian 6-71
[0021] The well has been handled for 8 rounds, and the result of the last round was unsatisfactory, and basically no oil was produced. This round uses water vapor + N 2 + CO 2 Simultaneously inject, start injecting high temperature foaming agent after 2 days of injection, inject one ton per day, inject foaming agent continuously for 3 days, inject high temperature foaming agent while steam + N 2 + CO 2 Continue to inject until the injection pressure reaches 7MPa and stop the injection; the cumulative injected water vapor is 821 m 3 , the cumulative injection of N 2 and CO 2 63000Nm 3 ; After the injection, the well was kept for 3 days, the pressure was reduced from 7.5MPa to 3.8MPa, and the production started to blow out. As a result, a large amount of gas was released. Therefore, the well was continued to be closed and kept until the well was kept for 6 days, and there was only a small amount of gas when the well was released. , the...
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Abstract
The invention relates to a heavy oil multiphase thermal huff and puff oil recovery method. By adopting the heavy oil multiphase thermal huff and puff oil recovery method, the main problems that the existing steam huff and puff oil recovery method is performed in a place which is far away from a near wellbore zone, the recovery is difficult due to temperature drop and the recovery rate is low are solved. The heavy oil multiphase thermal huff and puff oil recovery method is characterized in that mixed gas of high-temperature and high-pressure water vapor, N2 and CO2 is generated by combustion of a rocket power oil recovery device, the mixed gas, a high-temperature foaming agent and the water vapor generated by a steam boiler are injected into a formation, and the injection time and the sequence of all components are determined according to the status of the formation, subject to the fact that the pressure can not exceed the bursting pressure of the formation. The heavy oil multiphase thermal huff and puff oil recovery method has the characteristics of high recovery rate and good oil driving effect in the place which is far away from the near wellbore zone.
Description
technical field [0001] The invention relates to the field of oil recovery, in particular to a heavy oil multiphase thermal huff and puff oil recovery method. Background technique [0002] Steam huff and puff is a commonly used method in the field of oil production. Specifically, a certain amount of steam is injected into the oil well, and the well is shut down for a period of time. After the thermal energy of the steam diffuses into the oil layer, the well is opened to increase the production of heavy oil. method. The process of steam huff and puff operation can be divided into three stages, namely steam injection, well soaking and recovery. The existing steam huff and puff method is to inject high-temperature and high-pressure steam into the oil layer, and the temperature of the formation within a certain distance near the wellbore increases to heat the oil layer and crude oil. The steam injected into the oil layer preferentially enters the high-permeability zone. Howeve...
Claims
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