Sand-carrying fluid with effects of improving flow resistance of thickened oil and stabilizing clay

A technology of sand-carrying fluid and cross-linking agent, applied in the field of sand-carrying fluid, can solve the problems of affecting the sand control development effect of loose sandstone sensitive heavy oil reservoirs, high insoluble content, poor temperature resistance, etc. , Simplify the construction process and increase the effect of the protection function

Inactive Publication Date: 2021-04-13
CHINA PETROLEUM & CHEM CORP +1
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  • Description
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Problems solved by technology

At the same time, sand-carrying liquids such as natural vegetable gum, cellulose, synthetic polymers, and viscoelastic surfactants have disadvantages such as high insoluble content, high friction resistance, poor temperature resistance, and high cost, which limit this type of sand-carrying fluid. The application of liquid in sensitive heavy oil reservoirs affects the sand control development effect of unconsolidated sandstone sensitive heavy oil reservoirs

Method used

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  • Sand-carrying fluid with effects of improving flow resistance of thickened oil and stabilizing clay
  • Sand-carrying fluid with effects of improving flow resistance of thickened oil and stabilizing clay
  • Sand-carrying fluid with effects of improving flow resistance of thickened oil and stabilizing clay

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preparation example Construction

[0040] The preparation method of the sand-carrying main agent is as follows: acrylamide, quaternary ammonium salt, sulfonate and hydrophobic base compound are placed in the reaction kettle according to the above molar ratio, and the 2 Under protection, the reaction temperature is 75°C to 85°C for 8 hours to obtain a transparent gel-like sand-carrying liquid main agent.

[0041] Further, the sand-carrying liquid is composed of the following components and parts by weight: 0.3%-0.6% of the main agent of the sand-carrying liquid, and the balance is water, and the sand-carrying liquid is a thickened sand-carrying liquid. The sand-carrying liquid has obvious functions of dispersing and reducing viscosity of heavy oil, can improve the fluidity of heavy oil in the formation, and reduce flow resistance.

[0042] Further, the sand-carrying liquid also includes a crosslinking agent.

[0043] Further, the crosslinking agent is one or more of organoaluminum and organoboron.

[0044] The...

Embodiment 1

[0054] The molar ratio is acrylamide: dodecyltrimethylammonium bromide: dodecylbenzenesulfonic acid: bromododecane = 6:1:1:1, put it in the reaction kettle, under N 2Under protection, the reaction temperature is 70°C to 80°C for 5 hours to obtain a transparent gel-like sand-carrying liquid main agent.

[0055] The main agent of the sand-carrying liquid is diluted with water to 0.4% by weight to obtain a thickened sand-carrying liquid, which is measured at 30°C and 170s -1 The viscosity is 70.3mPa·s, the sedimentation velocity of single gravel is less than 0.003m / min, and the suspended sand time with 70% sand ratio is 4.76min.

[0056] Add 1‰ aluminum citrate crosslinking agent to the above-mentioned thickened sand-carrying liquid, and adjust the pH value of the system to 8-10 with sodium hydroxide solution to form gel-type sand-carrying liquid I. The jelly-type sand-carrying fluid I has outstanding temperature and shear resistance. At 90°C, after shearing for 2 hours, the vis...

Embodiment 2

[0062] The molar ratio is acrylamide: dodecyltrimethylammonium bromide: dodecylbenzenesulfonic acid: bromododecane = 7:1:1:1.5, placed in the reaction kettle, under N 2 Under protection, the reaction temperature is 75°C to 85°C for 8 hours to obtain a transparent gel-like sand-carrying liquid main agent.

[0063] The main agent of the sand-carrying liquid is diluted with water to 0.6% by weight to obtain a thickened sand-carrying liquid, which is measured at 30°C and 170s -1 The viscosity is 82.3mPa·s, the sedimentation velocity of single gravel is 0.002487m / min, and the suspended sand time with 70% sand ratio is 5.12min.

[0064] Add 0.5‰ organic boron cross-linking agent to the water-based sand-carrying liquid, and adjust the pH value of the system to 8-10 with ammonia solution to form gel-type sand-carrying liquid I. The jelly-type sand-carrying liquid I has excellent temperature and shear resistance. At 90°C, after shearing for 2 hours, the viscosity is greater than 200mP...

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Abstract

The invention relates to the field of loose sandstone development, in particular to a sand-carrying fluid with effects of improving flow resistance of thickened oil and stabilizing clay. The sand-carrying fluid comprises a sand-carrying fluid main agent and water, wherein the mole percentage ratio of the components of the sand-carrying fluid main agent, namely, the mole percentage ratio of acrylamide to quaternary ammonium salt to sulfonate to hydrophobic group is (6-8): (1-1.5): (1-1.5): (1-1.5). According to the sand-carrying fluid system, the anti-swelling function, the thickened oil flow resistance reduction function and the sand prevention function in filling sand prevention are integrated together, damage of working fluid is reduced, the stratum protection function is increased, the thickened oil recovery rate is increased, the cost is reduced, the construction process is simplified, and the sand prevention filling construction success rate is increased.

Description

technical field [0001] The invention relates to the field of unconsolidated sandstone oil reservoir development, in particular to a sand-carrying liquid capable of improving flow resistance of heavy oil and stabilizing clay. Background technique [0002] At present, the sand-carrying liquid systems commonly used at home and abroad mainly include: sewage sand-carrying liquid system, guar gum sand-carrying liquid system, polyacrylamide sand-carrying liquid system, and viscoelastic surfactant sand-carrying liquid system. These sand-carrying fluid systems only have a single sand-carrying function. When carrying out sand control filling construction in sensitive heavy oil reservoirs, additional viscosity reducers and clay stabilizers need to be added to reduce the viscosity of crude oil and reduce damage to oil layers. At the same time, sand-carrying liquids such as natural vegetable gum, cellulose, synthetic polymers, and viscoelastic surfactants have disadvantages such as high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/575C09K8/68C09K8/588C08F220/56C08F220/60C08F220/10C08F220/06C08F228/02
CPCC09K8/5756C09K8/685C09K8/608C09K8/588C08F220/56C09K2208/12C08F220/60C08F220/10C08F220/06C08F228/02
Inventor 李常友李鹏武明鸣姜静王勇魏芳陈雪梁伟贾维霞张川庭
Owner CHINA PETROLEUM & CHEM CORP
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