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A water shutoff agent for oil wells with bottom water reservoirs

A technology of bottom water reservoirs and water blocking agents, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of low formation cementation strength, high water outlet strength, easy shrinkage, etc., and achieve controllable thickening time , simple preparation, high compressive strength

Active Publication Date: 2020-12-22
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

[0004] The first object of the present invention is to overcome the problem that conventional oil well chemical water plugging is mainly polymer plugging agent, while the wells with high water content in low permeability bottom water reservoirs often have high water output strength and high wellhead pressure, and the strength of polymer plugging agent is difficult to meet the plugging requirements. The second problem is to overcome the low permeability and bottom water reservoirs. Under the existing technology, high-strength plugging agents such as cement with high strength have poor injectivity, which will easily cause damage to the reservoir near the wellbore and shrink after solidification, and the bonding strength with the formation Low, for high water cut wells, it is difficult to plug or increase production after plugging

Method used

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  • A water shutoff agent for oil wells with bottom water reservoirs
  • A water shutoff agent for oil wells with bottom water reservoirs
  • A water shutoff agent for oil wells with bottom water reservoirs

Examples

Experimental program
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Effect test

Embodiment 1

[0021] A water plugging agent for oil wells with bottom water reservoirs, which is made by mixing the following components according to weight percentage: 50%-98% of the main agent, 1%-30% of the nano-enhancer, and 1%-30% of the retarder 20%. The main agent is G-grade cement or ultra-fine cement, and the particle size range of G-grade cement or ultra-fine cement is 0.2µm-20µm; the nano-reinforcing agent is hydrophilic nano-silica and lipophilic nano-silica It is a mixture of 4:1-1:4 by mass; the retarder is larch sulfonated tannin extract, and the main component of larch sulfonated tannin extract is sulfonated products of tannin and non-tannin; the nano-enhanced The particle size of the agent is less than 50nm.

[0022] The preparation method of the water plugging agent for oil wells with bottom water reservoirs is as follows: adding a main agent with a weight percentage of 50%-98% in a kneader, and then adding a nano-enhancement agent with a weight percentage of 1%-30% and a...

Embodiment 2

[0028] A water shutoff agent for oil wells in bottom water reservoirs, which is prepared by mixing the following components according to the weight percentage: 50% of the main agent, 10% of the nano-enhancer, and 40% of the retarder. The main agent is G-grade cement with a particle size of 10 μm; the nano-reinforcing agent is a mixture of hydrophilic nano-silica and lipophilic nano-silica in a mass ratio of 1:1; the retarder is fallen leaves Pine sulfonated tannin extract and larch sulfonated tannin extract are mainly composed of tannin and non-tannin sulfonated products; the particle diameter of the nano-reinforcing agent is 50nm.

[0029] The preparation method of the water plugging agent for oil wells in bottom water reservoirs is as follows: adding 50% by weight of the main agent into the kneader, and then adding 10% by weight of nano-reinforcing agent and 40% by weight of retarder , stir for more than 30 minutes until the three are evenly mixed, stop stirring, and get the...

Embodiment 3

[0031] A water shutoff agent for oil wells in bottom water reservoirs, which is prepared by mixing the following components according to the weight percentage: 50% of the main agent, 10% of the nano-enhancer, and 40% of the retarder. The main agent is ultra-fine cement with a particle size of 15 μm; the nano-reinforcing agent is a mixture of hydrophilic nano-silica and lipophilic nano-silica in a mass ratio of 1:1; the retarder is fallen leaves Pine sulfonated tannin extract and larch sulfonated tannin extract are mainly composed of tannin and non-tannin sulfonated products; the particle size of the nano-reinforcing agent is 40nm.

[0032] The preparation method of the water plugging agent for oil wells in bottom water reservoirs is as follows: adding 50% by weight of the main agent into the kneader, and then adding 10% by weight of nano-reinforcing agent and 40% by weight of retarder , stir for more than 30 minutes until the three are evenly mixed, stop stirring, and get the ...

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Abstract

The invention belongs to the technical field of oil well water shutoff in oil exploitation, and specifically relates to a water shutoff agent for a bottom water reservoir oil well. The water shutoff agent for the bottom water reservoir oil well is prepared from the following components in percentage by weight: 50-98% of main agent, 1-30% of nanoreinforcing agent, and 1-20% of retarder. The water shutoff agent produced through the abovementioned formula overcomes the technical problems of conventional water cement water shutoff agents, such as short thickening time, easy contracting after curing and low strength of cementing with stratum; the water producing fractures of a low-permeability bottom water reservoir high-water-content well can be effectively blocked; in addition, the requirement on pressure bearing in fracturing increase production after water shutoff can be met.

Description

technical field [0001] The invention belongs to the technical field of oil well water shutoff used in petroleum exploitation, and in particular relates to a bottom water reservoir oil well water shutoff agent. Background technique [0002] In the development process of low-permeability bottom water reservoirs, due to the influence of formation fractures and heterogeneity, coupled with fracturing and putting into production, it is very easy to cause the bottom water to be communicated after the oil well measures, the water cut rises greatly, and the water cut is high. It seriously affects the production capacity of the oil well and the long-term stable production of the oil field. The current conventional water control and plugging technology can no longer meet the needs of this type of reservoir for water control and production increase. Bottom water reservoir control and plugging technology began to be explored and researched at home and abroad in the early 1990s. After mo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C09K8/467C09K8/42
CPCC04B28/04C04B2111/00293C04B2201/50C09K8/426C09K8/467C04B14/062C04B24/161
Inventor 王玉功武龙李勇吴增智宋振云李志航万向臣唐冬珠赵晨君徐洋汪小宇王所良杨发蒋文学万向辉武月荣李珊李雪
Owner BC P INC CHINA NAT PETROLEUM CORP
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