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Preparation and Application of Oil (Water) Well Sealing and Plugging System

A system and well section technology, which is applied in the field of plugging system preparation and oil (water) well sealing, can solve the problems of large use of plugging agents, low success rate and limited application scope in plugging operations.

Active Publication Date: 2018-02-02
廊坊瑞澜石油技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] [] The disadvantage of the cement system is that the volume shrinks after curing, and the cementation with the formation and the casing wall is poor; the curing time of the resin plugging system is not easy to adjust, the application range is limited, and the construction safety risk is also relatively large; especially for loose and empty formations , fractured formations, and fractured-vuggy limestone formations are often difficult to stay due to the plugging agent, coupled with the defects of the existing plugging system, the plugging operation uses a large amount of plugging agent, and the success rate is low, resulting in such oil (water) wells. Scrapped without effective treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Embodiment 1. The present invention is composed of a pre-plugging system and a plugging system. The plugging system is composed of the following raw material components: oil well G grade cement 40-50%, ultra-fine slag powder 15-20%, dispersible latex Powder 8-15%, microsilica fume 8%, UEA-H expansion agent 12%, polyacrylic acid fiber 2%, USZ drag reducer 0.2-0.5%, GH-1 (or GH-7) retarder 0.1-1.5 %; the preparation method is, according to the above-mentioned components and proportions, put them into the mixer in turn and mix well, and then get the dry material of the plugging system; in field application, mix the dry powder of the plugging system with clean water to form a paddle body, and the water-cement ratio is 0.6 -1.2.

Embodiment 2

[0011] Embodiment 2, the pre-plugging system, there are two types of pre-plugging system 1 and pre-plugging system 2, the components of pre-plugging system 1 account for the mass percentage of the reaction system: acrylamide 7-10%, dimethylacrylic acid Amidomethyl ammonium chloride 3-5%, modified starch 2-4%, N,N'-methylenebisacrylamide 0.02-0.08%, initiator (persulfate, azobisisobutylamidine One of salt and tert-butyl hydroperoxide, depending on temperature conditions) 0.02-0.06%, the balance is water, the static gelation time is controllable from 0.5-12 hours, and the dynamic gelation time is up to 105 hours.

Embodiment 3

[0012] Embodiment 3, the described pre-plugging system 2, each component accounts for the percentage of the system: water-soluble aminocarboxylic acid resin 3-6%, plugging system dry powder 5-20%, the balance is clear water, and its gelation time is 0.5- 3 hours controllable.

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Abstract

A production and application method of an oil (water) well channeling and leakage plugging system belongs to the field of oilfield chemistry, and fills the gap in oil (water) well channeling and leakage plugging and layer sealing technologies. The oil (water) well channeling and leakage plugging system is composed of a pre-plugging system and a plugging system, and the plugging system comprises 40-50% of oil well G grade cement, 15-20% of ultrafine mineral slag powder, 8-15% of dispersible latex powder, 8% of silicon micro-powder, 12% of an UEA-H expanding agent, 2% of polyacrylic acid fibers, 0.2-0.5% of a USZ drag reducer and 0.1-1.5% of a GH-1 (or GH-7) retarder; and the pre-plugging system comprises a type 1 pre-plugging system and a type 2 pre-plugging system. The oil (water) well channeling and leakage plugging system has the advantages of simple liquid preparation, good rheological property and injectivity, adjustable and controllable glue formation and solidification time, and safety in construction, is suitable for oil (water) well channeling and leakage plugging and layer sealing of loose and depleted strata, crack strata, crack and cavity type limestone strata and other complex geologic conditions, and is also suitable for leakage plugging of large leaking return in the drilling process.

Description

technical field [0001] The invention relates to the field of oil field chemistry, in particular to the preparation and application method of an oil (water) well sealing and plugging system. technical background [0002] [] The plugging system used in the oil field for oil (water) well casing leakage, pipe channeling and no longer development value oil layers mainly includes cement system composed of oil well cement and its additives, cured resin and its modified Sexual resin system. [0003] [] The disadvantage of the cement system is that the volume shrinks after curing, and the cementation with the formation and the casing wall is poor; the curing time of the resin plugging system is not easy to adjust, the application range is limited, and the construction safety risk is also relatively large; especially for loose and empty formations , fractured formations, and fractured-vuggy limestone formations are often difficult to stay due to the plugging agent, coupled with the d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C09K8/467
CPCC04B28/00C04B2111/00724C09K8/426C09K8/467C04B18/141C04B2103/0057C04B18/146C04B2103/0068C04B16/0633C04B2103/22C04B24/121C04B24/124C04B24/38C04B24/24
Inventor 张羽张宗晓杨广雷徐燕张正威张上
Owner 廊坊瑞澜石油技术有限公司