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Plugging agent for oilfield development

A technology of oil field development and plugging agent, which is applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of different water discharge patterns, etc., and achieve the effects of long validity period, wide application range and obvious plugging advantages

Active Publication Date: 2018-02-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the particularity of carbonate reservoirs, the water production law of oil wells is different from that of sandstone reservoirs, and traditional reservoir engineering methods are no longer applicable.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Preparation method of plugging agent: Add 10g of unsaturated resin 196# and 1.5g of emulsifier Tween 80 into a three-neck flask, stir at 600r / min at 25°C, add 20ml of deionized water at a constant speed of 1mL / min, and heat at 25°C Under the conditions of 600r / min stirring for 0.5h, the unsaturated resin emulsion is formed; then 9g of curing agent hydrogen peroxide and 4.5g of coupling agent organosilicon compound KH-550 are added to the above unsaturated resin emulsion. Stir at 30°C for 0.5h to obtain the plugging agent for profile control and water plugging.

[0024] In the blocking agent, the mass ratio of 196 unsaturated polyester resin in the unsaturated resin emulsion to the emulsifier is 6.67:1, and the amount of 196 unsaturated polyester resin is 31.75wt% of the unsaturated resin emulsion; And in the blocking agent, the unsaturated resin emulsion is 70wt%, the curing agent is 20wt%, and the coupling agent is 10wt%.

[0025] The test conditions for the plugging ...

Embodiment 2

[0027] The preparation method of the plugging agent is the same as in Example 1, but the amount of each raw material is changed so that the mass ratio of the 196 unsaturated polyester resin to the emulsifier in the unsaturated resin emulsion is 3:1, and the amount of 196 unsaturated polyester resin It is 20wt% of the unsaturated resin emulsion; and the unsaturated resin emulsion in the blocking agent is 72wt%, the curing agent is 21wt%, and the coupling agent is 7wt%.

[0028] The test conditions of the plugging agent in this example are: at 60°C, the permeability of the core is 0.46 μm 2 And when the plugging agent injection volume is 0.4 times PV (core pore volume); the breakthrough pressure gradient of the system is >60MPa / m, and the core plugging rate is 100%.

Embodiment 3

[0030] The preparation method of the blocking agent is the same as in Example 1, but the amount of each raw material is changed so that the mass ratio of the 196 unsaturated polyester resin in the unsaturated resin emulsion to the emulsifier is 10:1, and the amount of the 196 unsaturated polyester resin It is 25wt% of the unsaturated resin emulsion; and the unsaturated resin emulsion in the blocking agent is 65wt%, the curing agent is 25wt%, and the coupling agent is 10wt%.

[0031] The test conditions for the plugging agent in this example are: at 50°C, the permeability of the core is 1.98 μm 2 And when the plugging agent injection volume is 0.4 times PV (core pore volume); the breakthrough pressure gradient of the system is >60MPa / m, and the core plugging rate is 100%.

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PUM

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Abstract

The invention provides an oilfield development plugging agent which is prepared from unsaturated resin emulsion, a curing agent and a coupling agent as raw materials, the unsaturated resin emulsion is formed by mixing 196 unsaturated polyester resin, an emulsifier and water, and the coupling agent is gamma-aminopropyl triethoxysilane. The plugging agent is suitable for the formation at the temperature of 30-90 DEG C, and the resin solution can be self curing at the temperature, and can be used for the permanent sealing of large holes or large cracks which do not need plugging releasing. The oilfield development plugging agent has strong plugging ability, salt resistance, wide applicable scope, long validity period and low cost. Compared with the blocking agent in other profile control systems, the oilfield development plugging agent has obvious advantages on plugging of oil reservoirs with large holes or large cracks, and is in line with the needs of oil field sites.

Description

technical field [0001] The invention relates to a plugging agent for oil field development. Background technique [0002] During the development of carbonate oilfields, water usually enters along the tongues of high-permeability large pores and micro-fractures, and these high-permeability fracture channels cannot be clearly divided into layers on the vertical section, so simple mechanical separation cannot be adopted, so Chemical water shutoff technology will become an important measure to stabilize oil and control water in carbonate reservoirs. However, due to the particularity of carbonate reservoirs, the water production pattern of oil wells is different from that of sandstone reservoirs, and traditional reservoir engineering methods are no longer applicable. Therefore, it is necessary to develop water shutoff technology suitable for carbonate reservoirs. [0003] Patent application CN102746835A provides a carbonate rock oil well density selective water shutoff agent, i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/512
CPCC09K8/5086C09K2208/18
Inventor 吴川张祖国苏建政张汝生李建平杨立红赵修太王增宝
Owner CHINA PETROLEUM & CHEM CORP
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