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Productivity recovery method for an asphalt-blocked gravel-filled sand control well
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A technology for gravel packing and well productivity, which is applied in chemical instruments and methods, earthwork drilling, wellbore flushing, etc. It can solve the problems of slow production recovery and long soaking time, and achieve the effect of restoring productivity
Pending Publication Date: 2022-02-25
PETROCHINA CO LTD
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[0005] At present, after the asphalt is produced in the formation, the method of soaking the asphalt in diesel oil is mainly used to soften the asphalt. Although it can achieve certain effects, there are many problems: for example, the soaking time is too long, usually about 1 month; the recovery value of the formation permeability is only It is about 40% of that before asphalt production, and the recovery of production is slow.
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[0042] This pair of embodiments provides a method for recovering productivity of a gravel-packed sand control well blocked by asphalt. The method is used to recover the productivity of a gravel-packed sand control well blocked by asphalt in an oilfield in Iraq. The method includes:
[0043] Step 1: Simultaneously inject diesel oil and xylene with a volume ratio of 2:1 into the gravel-packed sand control well blocked by bitumen, and backwash the well after soaking for 2 days; wherein, the total volume of diesel oil and xylene injected in this step is the annulus 2 times the volume of the inner quartz belt;
[0044] Step 2: Then inject diesel oil and xylene with a volume ratio of 1:2 into the gravel-packed sand control well blocked by asphalt, and backwash the well after soaking for 5 days; wherein, the total volume of diesel oil and xylene injected in this step is ring 4.8 times the volume of the quartz belt in the hollow;
[0045]Step 3: Inject diesel oil and xylene with a vo...
[0052] Prepare 6 samples of formation asphalt plugging, each of which is prepared as follows: 1 kg of asphalt and 2 kg of clay are fully mixed at 60 degrees for 3 days to obtain a sample of formation asphalt plugging;
[0053] The 6 samples of stratum asphalt plugging were subjected to flushing experiment, the experimental conditions and process: flushing temperature 60 degrees, pressure 2MPa, 6 samples of stratum asphalt plugging with diesel oil and xylene volume ratio of 3:1, 2:1, 1:1 , 1:2, 1:3 cleaning solution for continuous cleaning, and test the cleaning material every 2 hours;
[0054] The results are shown in Table 1.
[0055] Table 1
[0056]
[0057]
[0058] It can be seen from Table 1 that when the volume ratio of diesel oil to xylene is 1:2, the amount of clay washed out can be significantly increased; while other volume ratios of diesel oil mixed with xylene can hardly wash out clay.
[0059] The above-mentioned die...
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Abstract
The invention provides a productivity recovery method for an asphalt-blocked gravel-filled sand control well. The method comprises a step of cleaning a sand consolidation belt in a stratum, wherein diesel oil and xylene with the volume ratio being 1: 2-1: 2.2 are injected into the gravel-packed sand prevention well blocked by asphalt at the same time, and the well is washed after soaking is conducted for a period of time. According to the method, part of clay particles can be brought out while asphalt is effectively cleaned, permeability of the stratum is improved, and productivity of an oil well can be rapidly recovered within a short time.
Description
technical field [0001] The invention relates to the technical field of oil field development, in particular to a method for recovering productivity of sand control wells blocked by asphalt and gravel. Background technique [0002] During the exploitation of oil and gas wells, the sand production of oil and gas wells not only directly affects the quality and production effect of oil and gas wells, but also causes serious damage, such as shortening the life of oil and gas wells and increasing maintenance costs. Gravel packing sand control is the current mainstream sand control technology. It is mainly aimed at formations with severe cementation and loose sand production. It first runs the wire-wrapped screen into the oil layer in the well, and then pumps the pre-selected gravel on the ground with filling fluid. In the annular space between the wire-wound screen and the wellbore or between the wire-wrapped screen and the casing, a gravel pack is formed to prevent the oil layer ...
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