Profile modifying/water plugging agent and preparation method and application thereof

A technology of profile control water shutoff agent and water shutoff agent, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as large construction risks and hidden safety hazards, failure of construction operations, rise in injection pressure, etc., and achieve an improvement The gel strength and plugging effect, the effect of improving suspension stability and increasing the injection distance

Active Publication Date: 2017-03-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The large liquid volume and long-term preparation process require that the profile control water shutoff agent system has good suspension stability, so as to avoid the stratification of the components of the water shutoff agent system when the injected fluid reaches the required part of the formation, resulting in the composition of the water shutoff agent. Poor adhesive performance, unable to completely block the formation water channel, resulting in failure of construction work
At the same time, the suspension stability of the existing microbial polysaccharide profile control agent system is poor, and the dosing fluid will undergo significant settlement and stratification after half an hour in the standing process
During the on-site construction operation, after the pre-injected fluid is squeezed into the wellhead, as the water shutoff agent fluid moves downward, the solid phase particles in the water shutoff agent system will settle and accumulate in the wellbore and near the wellbore, causing water shutoff The agent cannot enter the water outlet channel deep in the formation, causing the injection pressure to rise rapidly, and the designed injection volume cannot be completed
The solid phase deposited in the wellbore and near the wellbore will form a high-viscosity jelly in a short period of time, resulting in wellbore blockage and pollution of the production section of the oil well, which poses a greater construction risk and safety hazard

Method used

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  • Profile modifying/water plugging agent and preparation method and application thereof
  • Profile modifying/water plugging agent and preparation method and application thereof
  • Profile modifying/water plugging agent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] 1) According to the content of each component in the profile control water shutoff agent, prepare 5 parts of water shutoff agent to measure the gel strength at different gelation times: curdlan gum 2%, suspension stabilizer 0.5%, water retention agent 5% , 2% gel strength accelerator, 5% cross-linking inhibitor, and the rest are dosing fluids. The suspension stabilizer is 0.08% Welan gum and 0.42% bentonite, and the most probable distribution particle size of bentonite is 50 μm. The water-retaining agent is a starch-grafted acrylate copolymer cross-linked product. The gel strength promoter is polyborate. The crosslinking inhibitor is glycerol. The ligand fluid is that the white oil accounts for 40% by weight of the dosing fluid. 2) Add suspension stabilizer, curdlan gum, water retaining agent, gel strength accelerator and crosslinking inhibitor in sequence to the dosing fluid. The speed of mechanical stirring is 500 rpm. The overall preparation process of the water b...

Embodiment 2

[0062] Prepare 4 parts of water shutoff agent to measure the gel strength at different gelation times, and gel the obtained solution in an oven at 95°C. The gelation times are 2.5 hours, 4 hours, 22 hours, and 53 hours. And the gel strength obtained under different gelation time was measured at 25°C.

[0063] All the other are with embodiment 1.

[0064] see results figure 2 .

Embodiment 3

[0066] 1) According to the content of each component in the profile control water shutoff agent, prepare 5 parts of water shutoff agent to measure the gel strength at different gelation times: curdlan gum 2%, suspension stabilizer 1%, gel strength booster Agent 2%, cross-linking inhibitor 7%, and the rest are dosing fluids. The suspension stabilizer is 0.15% Welan gum and 0.85% bentonite, and the most probable distribution particle size of bentonite is 50 μm. The water-retaining agent is a starch-grafted acrylate copolymer cross-linked product. The gel strength promoter was orthoborate. The crosslinking inhibitor is glycerol. The ligand fluid is high-salinity brine with a total salinity content of 200g / L.

[0067] 2) Add suspension stabilizer, curdlan gum, gel strength accelerator and cross-linking inhibitor in sequence to the dosing fluid, the speed of mechanical stirring is 600 rpm, and the overall preparation process of the water blocking agent system needs to be continu...

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Abstract

The invention relates to the technical field of oil field development, and in particular relates to a profile modifying / water plugging agent for oil well water plugging and profile modification. The water plugging agent is prepared from the following components in mass percent: 1-15% of polysaccharide, optimally 2-10% of the polysaccharide; 0.5-10% of a suspension stabilizer, optimally 1-6% of the suspension stabilizer; 0.5-20% of a gel strength accelerating agent, optimally 2-10% of the gel strength accelerating agent; and the balance of preparation fluid. The invention also provides a method for preparing the water plugging agent and application thereof.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a profile control and water shutoff agent for oil well water shutoff and profile control, as well as a preparation method and application thereof. Background technique [0002] As the oilfield development gradually enters the middle and late stages, some oil wells will break through prematurely or be flooded due to water layer channeling, bottom water coning or injection water, and edge water rushing. In order to remove or reduce water flooding, control the flow of water in the water-producing layer and change the flow direction of water in water flooding oil, and improve the recovery rate of water flooding, it is necessary to use plugging water agents on production wells or injection wells to plug the water out Layer construction work. Water plugging in oil wells is an important measure to maintain the normal production of oil wells, especially in reservoirs with m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/514C09K8/508C09K8/516C09K8/506
CPCC09K8/5045C09K8/506C09K8/5086C09K8/514C09K8/516
Inventor 刘松苏长明张锁兵苏建政张汝生王连生赵梦云张大年郑承纲史爱萍
Owner CHINA PETROLEUM & CHEM CORP
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