Filling and leakage blocking process for cracking leak gravel

A gravel filling and leakage technology, which is applied in wellbore/well components, production fluid, sealing/packing, etc., can solve the problem of poor cement injection effect, improve the possibility of plug formation, facilitate processing and simple process Effect

Inactive Publication Date: 2007-03-14
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a kind of fracture leakage gravel filling and plugging process, which is used to solve the extra large fracture leakage in the Luohe Formation in the Longdong area, especially to solve the problem that the leakage volume is greater than 130 cubic meters per hour and the static liquid level is lower than 150 meters, bridge plugging, static plugging, air-filled microbubble plugging, and the extra-large malignant leakage problem that the effect of multiple conventional cement injections is not obvious

Method used

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  • Filling and leakage blocking process for cracking leak gravel

Examples

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Comparison scheme
Effect test

Embodiment 1

[0014] Example 1 As shown in Figure 1, the gravel plugging is to first prepare 20 cubic meters of conventional bridge plugging slurry in the upper water tank, and then select 2 tons of medium-sized gravel 1 and small-sized gravel 2, medium-sized gravel 1 The length is about 8mm, the width is about 2mm, the thickness is about 1mm, and the length of the small-grained gravel 2 is about 3mm. It is poured from the wellhead of the empty well according to the size of the gravel, and the different particle sizes of the gravel particles are used to enter and block the corresponding level. The pouring speed of crack 3 and vertical crack 4 is controlled at 7 bags per 5 minutes, and each bag weighs 50 kg. At the same time, the pump is continuously fed to prevent the gravel from bridging and swelling in the middle of shaft 5. The pump displacement is adjusted to 10 liters per second. , the entire gravel filling time is completed within 30 minutes, and then the next roller cone bit or scrape...

Embodiment 2

[0016] The process of embodiment 2 is roughly the same as that of embodiment 1, the difference is: select 3.5 tons of medium-sized gravel 1 and small-sized gravel 2, the length of medium-sized gravel 1 is about 10mm, the width is 2.5mm, and the thickness is 1.5mm , the length of the small-grained gravel 2 is about 3.5mm, and it is poured from the wellhead of the empty well according to the size of the gravel, and the pouring speed is controlled at 8 bags per 5 minutes, because different grains of the gravel are used to enter and seal the corresponding cracks; Then the next tri-cone bit or scraper bit will move the gravel, so that the gravel can enter the cracks of the corresponding size to the greatest extent, and finally the drill pipe will be lighted to inject cement at a position 40 meters away from the top of the leakage layer, because of gravity, and The gravel is flat, so the flow rate of the gravel slows down in the crack until it stops flowing. At the same time, the gra...

Embodiment 3

[0017] Embodiment 3 is roughly the same as the process of embodiment 1, the difference is: select 5 tons of medium-sized gravel 1 and small-sized gravel 2, the length of medium-sized gravel 1 is about 11.5mm, the width is 3mm, and the thickness is 2mm. The length of the small-grained gravel 2 is about 4mm. It is poured from the wellhead of the empty well according to the size of the gravel, and the pouring speed is controlled at 10 bags per 5 minutes. Finally, the drill pipe is lowered to inject cement at a position 60 meters away from the top of the leakage layer.

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Abstract

The invention relates to a plugging technology, especially plugging technology with gravel for cracking leakage. First 2-5t gravel with the uneven grain size is poured and entered gravel with different grade blocks relative crack. Then one drill extends to pull gravel out so that gravel enters into relative crack at the greatest level. Naked drill-stem extends to the position in 20-60m to the top layer of leakage layer and cement is injected. Because gravel is resorted in crack and cement paste flowing further is hindered cement plug is formed. The technology is used to solve extra crack leakage in Luohe formation of Longdong area, especially extra malignancy leakage with leakage amount more than 130 stere per hour, still fluid face less than 150m and bridge plug leakage stoppage so on.

Description

technical field [0001] The invention relates to a plugging technology, in particular to a plugging technology of fracture leakage gravel filling. Background technique [0002] The Luohe layer in the Longdong area belongs to the large-pore high-permeability low-pressure sand-water layer, and the well depth is between 750 meters and 1200 meters. The sand particles in the Luohe Formation are medium sand, fine sand, and silt sand, and most of the particle diameters are below 250um. The leakage of the Luohe Formation constitutes the main force of large-scale leakage in the Longdong area, accounting for more than 80% of the large-scale leakage every year on average. The catastrophic leakages all occurred in the Luohe Formation. There are abnormal pressure zones in the Luohe formation in some areas of the Longdong block, and the formation pressure coefficient is only between 0.76 and 0.86. By taking 3-meter cores from the leaky layer in the Luohe section of Well Xi 29-02, the nak...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13E21B43/04
Inventor 吴付频王伟良
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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