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Composite slug deep water plugging method for oil pool with high water content

A composite section, water-containing oil technology, applied in drilling compositions, chemical instruments and methods, earthwork drilling, etc. Non-toxic and environmentally friendly, prolonging the validity period of water plugging, and excellent performance of plugging agents

Active Publication Date: 2014-01-08
陕西越洋石油技术服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical water plugging technology has the advantages of wide sources of plugging agents, simple construction technology, and relatively high success rate of water plugging, but conventional chemical gel plugging agents are easily affected by various factors such as reservoir salinity, temperature, pressure, and shear. , leading to difficult control of the gelling time and strength of the jelly, and poor erosion resistance, resulting in a short effective time for water plugging; in addition, the conventional water plugging process design is often not matched with the plugging agent performance, such as plugging agent placement distance, construction pressure, pump injection Unreasonable design of technological measures such as speed, resulting in jelly damage to the oil layer or water flowing around the formation quickly, resulting in a short effective period of water plugging or a low success rate, and poor production stimulation effect
Therefore, the existing on-site water plugging operations in oilfields have technical problems such as plugging agent pollution, easy plugging and easy opening, short validity period, and poor production increase effect.

Method used

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  • Composite slug deep water plugging method for oil pool with high water content

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Experimental program
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Effect test

Embodiment 1

[0039]A composite slug deep water plugging method for high water-cut oil reservoirs, which is characterized by using different plugging agent characteristics to perform composite plugging, high-strength plugging agent is used in the near-wellbore zone, and medium-strength plugging agent is used in the transition zone , the low-strength plugging agent is designed to slug in the far well area; the high-strength plugging agent uses foaming gel plugging agent, the medium-strength plugging agent uses inorganic chromium jelly plugging agent, and the low-strength plugging agent uses phenolic jelly plugging agent .

[0040] Phenolic jelly plugging agent is obtained by crosslinking emulsion polymer and pre-polymerized phenolic resin; the preparation process is to use water-in-water polyacrylamide emulsion with a concentration of 1-3%, stir and dissolve; then add a concentration of 0.5- 1.0% prepolymerized phenolic resin, and finally add 0.01-0.05% sodium thiosulfate stabilizer, stir we...

Embodiment 2

[0045] A composite slug deep water shutoff method for high water cut oil reservoirs, the specific implementation process of the composite slug of the water shutoff technology is as follows:

[0046] Pre-slug: Select phenolic gel plugging agent; use water-in-water emulsion with a concentration of 2.0%, stir to fully dissolve; then add prepolymerized phenolic resin with a concentration of 1.0%, and finally add 0.1%, and stir evenly. Phenolic resin jelly. The jelly plugging agent adopts shear-resistant water-in-water polyacrylamide emulsion, which has strong shear resistance; gelation time is 120h, gelation strength D (gel code), good elasticity; temperature resistance 70-120℃, 80 ℃ Aging is stable for 180 days without gel breakage.

[0047] Transition slug: choose inorganic chromium jelly plugging agent; use water-in-oil polyacrylamide emulsion with a concentration of 1.5-2.0%, then add a surfactant with a concentration of 0.05% OP10, stir to dissolve; then add a concentration ...

Embodiment 3

[0050] A composite slug deep water plugging method for high water-cut oil reservoirs. The plugging ability of the jelly plugging agent is evaluated by using sand-filled pipe cores, and the performance of the inorganic chromium-based jelly plugging agent is determined.

[0051] The plugging agent formula is 1.8% water-in-oil emulsion polyacrylamide+0.05%OP-10+0.1%K 2 Cr 2 o 7 + 0.50% thiourea + _0.13% calcium lignosulfonate + 0.1% sodium thiosulfate stabilizer.

[0052] The experimental process is as follows: select three parallel sand filling pipes (φ38*500mm), design them as high, medium and low permeability respectively, and measure the permeability k before plugging by water flooding until the pressure is stable. wo ; Then prepare the above formula jelly, inject 0.4PV, and then inject 0.1PV water for over-displacement, then keep the sand-packed pipe in an 80°C thermostat for 3 days, and after the plugging agent is completely gelled, water flood it again until the pressure...

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Abstract

The invention relates to a composite slug deep water plugging method for an oil pool with a high water content, and belongs to the technical field of oilfield development. The composite slug deep water plugging method for the oil pool with the high water content is characterized in that a composite slug is designed by using different plugging agent characteristics, high-strength plugging agents are filled into a near-wellbore zone slug, middle-strength plugging agents are filled into a transitional zone slug, and low-strength plugging agents are designed in a far-wellbore zone slug; foaming gel plugging agents are adopted as the high-strength plugging agents, inorganic chrome jelly plugging agents are adopted as the middle-strength plugging agents, and phenolic aldehyde jelly plugging agents are adopted as the low-strength plugging agents. The composite slug deep water plugging method has the advantages of being reasonable in process, easy to construct, long in water plugging validity period, free of poison, environmentally friendly, capable of achieving selective deep water storage, capable of plugging high-water-content zones and not damaging oil layers and long in water plugging validity period, effectively reducing the water content of oil well produced liquid, guaranteeing the normal production of an oilfield and the like.

Description

technical field [0001] The invention belongs to the technical field of oilfield development, and in particular relates to a composite slug deep water shutoff method for high water-cut oil reservoirs. Background technique [0002] At present, as the oilfield development enters the middle and later stages, the water output of oil wells is becoming more and more serious. At present, the average water content of oil wells has reached more than 80%. After a large amount of water output from oil wells, it will not only increase the sewage treatment capacity and treatment costs of the combined station, but also increase the corrosion and scaling of ground pipelines. , and the water out of the oil well will also lead to the decline of formation energy, a large amount of sand in the formation and other problems. The rise of water cut in oil wells is the main reason for the decline of oil wells and even oil fields and the acceleration of decline rate. The more water produced by oil we...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13C09K8/44
Inventor 亓海燕诸葛雄飞何跃超向安高立红武晓炜张金
Owner 陕西越洋石油技术服务有限公司
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