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A kind of plugging agent and preparation method for plugging malignant leakage formation fractures

A leak-stopping agent and leak-off technology, which is applied in the field of oil drilling, can solve the problems that the leak-stopping agent cannot bridge, reinforce, and stay, etc., and achieve the effects of low price, time saving, and strong plugging ability

Active Publication Date: 2020-12-18
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problems that the lost circulation agent cannot bridge, stay, fill and reinforce in large fractures, and provide a lost circulation agent and its preparation method for sealing the formation fractures of malignant leakage

Method used

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  • A kind of plugging agent and preparation method for plugging malignant leakage formation fractures
  • A kind of plugging agent and preparation method for plugging malignant leakage formation fractures
  • A kind of plugging agent and preparation method for plugging malignant leakage formation fractures

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This embodiment provides a figure 1 The shown lost circulation agent for plugging the formation fractures of malignant loss includes the following components: by mass percentage, 45-56% of oil well G grade cement, 8-12% of gravel, 12-15% of rice stone, 15% -20% fracturing sand, 6-9% fine plugging agent, 1-2% fluid loss reducer, 2-4% external admixture.

[0026] The oil well grade G cement is one or more of oil well high resistance cement, oil well low resistance cement and 425 cement.

[0027] The gravel is one or more of pebbles, white jade, graded crushed stones, sandstones, and flakes, and the particle size of the gravels is 10-40mm.

[0028] The rice stone is one or more of quartz sand, sea glass, sandstone, washed stone, block stone, and stone chips, and the particle size of the rice stone is 4-10mm.

[0029] The fracturing sand is one or more of natural quartz sand, ceramsite sand, yellow sand, and river sand, and the particle size of the fracturing sand is 1-4m...

Embodiment 2

[0042] On the basis of Example 1, this example provides a preferred plugging agent for plugging the fractures in the formation with malignant loss. Magnesite fiber (particle size 0.1-1mm), 3% polyethylene fiber (particle size 0.1-1mm), 1% emulsified asphalt, 2% dihydrate gypsum, after mixing evenly, dry at 70°C for 2 hours , to obtain a binary gel; then add 9% pebbles (15-30mm in particle size), 12% sandstone (4-9mm in particle size), and 15% natural quartz sand (2-4mm in particle size), After mixing evenly, put it in a dryer and dry it at 60°C for 1.5 hours. After cooling, put it into a moisture-proof packaging bag and seal it to obtain a ternary rigid gel, which is used to seal the formation fractures of malignant leakage. After the plugging agent is prepared, use special mixing and strong pumping equipment for petroleum to prepare ternary rigid gel plugging slurry. The water-cement ratio (quality of water / quality of plugging agent) ) is 0.27, and its plugging function is c...

Embodiment 3

[0046] This example takes Well Ning 26-281 as an example. Well Ning 26-281 is located in Jixian Township, Heshui County, Gansu Province. The vertical depth of the Luohe River is 540-820 meters. Layer 810-841 meters, multiple loss-return leaks occurred successively. Cement was used for plugging twice, packer squeezed the bridge plugging slurry once, and coarse plugging agent was used for plugging three times, all of which failed to achieve the expected plugging effect , the return displacement is only 1 / 3.

[0047] The lost circulation agent of the present invention for plugging the formation fractures of malignant leakage is formulated as follows, by mass percentage, 56% of oil well high-resistance cement, 8% of white jade, 12% of quartz sand, and 15% of pottery Granular sand, 6% brucite fiber, 1% sulfonated bitumen, 2% dihydrate gypsum. After the plugging agent is prepared, use special mixing and strong pumping equipment for petroleum to prepare ternary rigid gel plugging sl...

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Abstract

The invention provides a lost circulation additive for plugging severe mud loss formation fracture and a preparation method of the lost circulation additive. The lost circulation additive comprises the following components in percentage by mass: 45-56% of oil well grade-G cement, 8-12% of gravel, 12-15% of granolithic, 15-20% of fracturing sand, 6-9% of a thin plugging agent, 1-2% of a fluid loss agent and 2-4% of an admixture. According to the lost circulation additive disclosed by the invention, large fractures and large holes of the severe mud loss formation can be well plugged, the problem that the plugging agent cannot be bridged, remained, filled and reinforced in the large fractures can be well solved, and the requirements on drilling construction and environment friendliness are met. Moreover, the preparation method is simple, the operability is high, the severe mud loss plugging effect is obvious, the plugging operation cost is effectively reduced, and the plugging operation time is saved.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling, in particular to a leak-stopping agent for sealing fissures in formations with malignant leakage and a preparation method thereof. Background technique [0002] From 2015 to 2016, 172 wells lost oil wells in Changqing area, of which 28 were viciously lost, 4 wells were sidetracked by filling wells, and 4 wells were abandoned. There were 22 gas wells with shallow surface leaks, including 8 with malignant leaks and 4 with plugging time longer than 100 hours. Among them, the plugging time of Zhen 309-840 well was as long as 336 hours, 12 times of bridge plug plugging, 8 times of cement injection plugging, finally the plugging was invalid, and the well was sidetracked. Wells Peng 292-80 and Peng 291-77 went through 12 times of cement injection and 3 times of gravel filling, but they still lost their way and were finally abandoned. [0003] At present, Changqing Drilling Corporation has d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B28/02C09K8/487C04B111/70
CPCC04B28/02C04B28/04C04B2111/00146C04B2111/00663C04B2111/70C04B2201/05C04B2201/20C04B2201/50C09K8/426C09K8/487C04B7/00C04B14/02C04B14/048C04B18/0427C04B18/027C04B14/46C04B18/248C04B14/20C04B18/26C04B16/0625C04B24/36C04B24/24C04B24/2623C04B14/365C04B22/00C04B24/281C04B24/18C04B20/0076C04B14/06
Inventor 朱明明周波鲍煜屈艳平刘磊张迁
Owner BC P INC CHINA NAT PETROLEUM CORP
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