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Method for implementing oil well deep part selective water plugging by utilizing waste polystyrene foam plastic

A technology of discarding polystyrene and foam plastics, which is applied in wellbore/well parts, chemical instruments and methods, earthwork drilling and production, etc. It can solve the problems of selective water shutoff in the deep part of the oil layer and the inability to reach the deep part of the oil layer, etc., and achieve cost The effect of low, strong selectivity and wide source of raw materials

Active Publication Date: 2015-03-25
PETROCHINA CO LTD
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  • Claims
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AI Technical Summary

Problems solved by technology

[0004] Although the use of oil-soluble resins as plugging agents in the prior art can partially solve the problem of selective water plugging, the disadvantages of these existing oil-soluble resin plugging agents are: the core of the plugging agent exists in a solid form, and cannot reach the deep part of the oil layer, so it cannot Deep selective water shutoff

Method used

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  • Method for implementing oil well deep part selective water plugging by utilizing waste polystyrene foam plastic

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Effect test

Embodiment 1

[0031] Preparation and evaluation of embodiment 1 blocking agent solution

[0032] Add the recovered waste polyethylene foam plastics to the mixed solvents in schemes k to n in Table 1, heat to 40°C to 60°C, and stir to dissolve. Experiments show that waste polyethylene foam can be quickly dissolved in the mixed solvents in Table 1, and no precipitation occurs after cooling to room temperature. Can improve production time rate.

[0033] Table 1. The distribution ratio of each component of the mixed solvent

[0034]

Embodiment 2

[0036] A well in Huanxi Oilfield, 1063.40m-1111.80m, 23m / 10 layers, steam injection for the 15th time. The average permeability is 1329.8mD (millidarcy), the daily liquid production is 25.8 cubic meters, the daily oil production is 0.5 tons, and the water content is 98%. The oil well has high water cut, so it is decided to adopt selective water shutoff in the deep part of the oil layer.

[0037] The implementation steps are as follows:

[0038] 1. Recycle waste polystyrene foam, remove surface debris, and reserve;

[0039] 2. Preparation of plugging agent solution: The organic solvent is a mixed solution obtained by mixing xylene, ethyl acetate and acetone according to the volume ratio of 2:4:1, heated in a water bath to 50°C, and 10 parts by weight of the above spare waste polyethylene foam Add the plastic to 10 parts by weight of the organic solvent, and stir while adding, until all the waste polyethylene foam plastics for use are dissolved, then add 100 parts by weight of d...

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Abstract

The invention relates to a method for implementing oil well deep part selective water plugging by utilizing waste polystyrene foam plastic. The method comprises the following steps: preparing a plugging agent solution : adding 100 parts by weight of waste polystyrene foam plastic to 5-15 parts by weight of an organic solvent, and stirring and dissolving at 40-60 DEG C to obtain the plugging agent solution; or further adding 10-200 parts by weight of diesel, stirring and mixing to obtain the plugging agent solution, wherein the organic solvent is selected from one or more of methylbenzene, xylene, methyl acetate, ethyl acetate and acetone; adding the plugging agent solution to diluted crude oil and / or diesel as carrier fluid to obtain plugging agent oil liquid, and annularly extruding the plugging agent oil liquid from an oil jacket to the stratum; jacking the plugging agent oil liquid into the deep part of the stratum by utilizing displacing liquid; closing the oil well for 1-2 days, and then opening the oil well normally for production. According to the method for implementing the oil well deep part selective water plugging by utilizing the waste polystyrene foam plastic, the method for implementing oil well deep part selective water plugging is realized by utilizing waste polystyrene foam plastic; effluent can be effectively controlled at a water layer, and no pollution and damage to an oil layer are realized.

Description

technical field [0001] The invention relates to a method for selectively shutting off water in the deep part of an oil well, in particular to a method for selectively shutting down water in the deep part of an oil well by using waste polystyrene foam plastics, and belongs to the field of water shutoff in oil fields. Background technique [0002] Oil well plugging refers to controlling the production of water from oil wells, with the purpose of improving the production efficiency of oil wells. Chemical water plugging is a method of injecting chemical plugging agent into the water outlet layer on the ground, and using the product of physical and chemical reactions between the plugging agent and the oil layer to plug the oil layer. Oil-soluble resin water plugging technology is based on the principle that oil-soluble resin can be dissolved in crude oil, but when it meets water, it will form agglomerated substances to block, so as to achieve the purpose of water blocking without...

Claims

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Application Information

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IPC IPC(8): E21B33/12C09K8/502
CPCC09K8/5083E21B33/13
Inventor 高玉军马春宝曹广胜王德伟孙红霞闻晶姚志强
Owner PETROCHINA CO LTD
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