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Preparation method of rapid dissolving agent for polyacrylamide profile control and flooding blocked stratum

A technology of polyacrylamide and dissolving agent, which is applied in the direction of chemical instruments and methods, earthwork drilling, and drilling compositions, etc. It can solve the problems of insignificant drop in injection pressure, large increase in injection pressure, and insufficient injection, etc., and achieve Improve formation permeability, relieve formation blockage, and reduce pipe string corrosion

Pending Publication Date: 2021-08-13
西安石油大油气科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, low-permeability, ultra-low-permeability and ultra-low-permeability reservoirs are not suitable for the above-mentioned methods for control, flooding and plugging control. Microsphere and micron-scale gel particle plugging agents have achieved better water control, oil stabilization and even oil increase effects in low-permeability, ultra-low-permeability and some ultra-low-permeability reservoirs. With its large-scale promotion and multiple rounds of For profile control and flood control, some wells have experienced a large increase in injection pressure, or even under-injection and injection failure. Conventional acid fracturing has poor plugging and injection enhancement effects and a short validity period. After the measures, the injection pressure does not drop significantly. The average validity period is less than 30 days
[0004] At present, micron-scale and nano-scale cross-linked polyacrylamide microspheres are well applied in profile control and flooding of low-permeability reservoirs. Conventional acid fracturing measures are not effective and the treatment radius is small.
Referring to the idea of ​​polymer injection blockage control in the middle and high permeability oilfields in the east
Substances such as strong oxidants have poor stability, fast reaction rate, and limited distance for plugging removal during transportation, storage, and on-site construction. More importantly, there are safety risks of fire, explosion, and strong corrosion. extremely stringent safety requirements

Method used

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  • Preparation method of rapid dissolving agent for polyacrylamide profile control and flooding blocked stratum
  • Preparation method of rapid dissolving agent for polyacrylamide profile control and flooding blocked stratum
  • Preparation method of rapid dissolving agent for polyacrylamide profile control and flooding blocked stratum

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Example 1: A method for preparing a fast dissolving agent for polyacrylamide-based profile control and flooding plugged formations, comprising the following steps:

[0029] S1. By weight percentage, weigh 30% nitrogen methyl pyrrolidone, 3% sodium silicate, 2% 2-hydroxyphosphorylacetic acid, 5% trisodium N,N-dicarboxymethylalanine, tannin Potassium acid 1%, the balance of deionized water;

[0030] S2. After checking the normal operation of the reactor, open the reactor and add deionized water, control the temperature in the reactor to 25°C, and keep the constant temperature for 4 minutes;

[0031] S3. Add nitrogen-methylpyrrolidone into the reaction kettle at a rate of 5 L / min, turn on the stirring device after the materials are completely added, and continuously stir at a rate of 50 rad / min for 8 minutes, and control the temperature at 30°C;

[0032] S4. Add sodium silicate and 2-hydroxyphosphoroacetic acid into the reaction kettle at a rate of 5 L / min in sequence, stir...

Embodiment 2

[0037] Embodiment 2: A method for preparing a fast dissolving agent for polyacrylamide-based profile control and flooding plugged formations, comprising the following steps:

[0038] S1. In terms of weight percentage, weigh 40% nitrogen methyl pyrrolidone, 4% sodium silicate, 4% 2-hydroxyphosphorylacetic acid, 8% trisodium N,N-dicarboxymethylalanine, tannin Potassium acid 5%, the balance of deionized water;

[0039] S2. After checking the normal operation of the reactor, open the reactor and add deionized water, control the temperature in the reactor to 30°C, and keep the constant temperature for 8 minutes;

[0040] S3. Add nitrogen-methylpyrrolidone into the reaction kettle at a rate of 7 L / min, turn on the stirring device after the materials are completely added, and continuously stir at a rate of 78 rad / min for 10 min, and control the temperature at 35°C;

[0041] S4. Add sodium silicate and 2-hydroxyphosphoroacetic acid into the reactor at a rate of 8 L / min in sequence, a...

Embodiment 3

[0046] Embodiment 3: A method for preparing a fast dissolving agent for polyacrylamide-based profile control and flooding plugged formations, comprising the following steps:

[0047] S1. Calculated by weight percentage, respectively weigh 50% of nitrogen methyl pyrrolidone, 5% of sodium silicate, 6% of 2-hydroxyphosphorylacetic acid, 10% of trisodium N, N-dicarboxymethylalanine, tannin Potassium acid 3%, the balance of deionized water;

[0048] S2. After checking the normal operation of the reactor, open the reactor and add deionized water, control the temperature in the reactor to 35°C, and keep the constant temperature for 10 minutes;

[0049] S3. Add nitrogen-methylpyrrolidone into the reaction kettle at a rate of 10 L / min, turn on the stirring device after the materials are completely added, and continuously stir at a rate of 100 rad / min for 12 minutes, and control the temperature at 40°C;

[0050] S4. Add sodium silicate and 2-hydroxyphosphoroacetic acid to the reaction ...

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Abstract

The invention discloses a preparation method of a rapid dissolving agent for a polyacrylamide profile control and flooding blocked stratum. The preparation method comprises the following steps: S1, respectively weighing N-methyl pyrrolidone, sodium silicate, 2-hydroxyphosphoryl acetic acid, N, N-dicarboxymethyl alanine trisodium salt, potassium tannate and the balance of deionized water in proportion; S2, starting a reaction kettle, and adding deionized water; S3, adding N-methyl pyrrolidone into the reaction kettle, and starting a stirring device for stirring; S4, sequentially adding sodium silicate and 2-hydroxyphosphoryl acetic acid into the reaction kettle, and continuously stirring; S5, adding N, N-dicarboxymethyl alanine trisodium salt into the reaction kettle, and continuously stirring; S6, adding potassium tannate into the reaction kettle, and uniformly stirring; and S7, after the reaction is finished, naturally cooling to normal temperature to obtain the required rapid dissolving agent. The process is reasonable in design, and the obtained rapid dissolving agent is high in safety in the on-site construction process and very wide in application prospect.

Description

technical field [0001] The invention relates to the technical field of oilfield chemical additives, in particular to a method for preparing a polyacrylamide-based fast dissolving agent for profile control, flooding, plugging formations. Background technique [0002] In recent years, more than 80% of my country's proven oil reserves are low-permeability, ultra-low-permeability and ultra-low-permeability reservoirs. The reservoirs have poor physical properties, low porosity and permeability, strong vertical and plane heterogeneity, and developed micro-fractures. Difficulty, low degree of water drive, water flooding development can see water when it is effective, water drive unevenness is serious, proven geological reserves are recovered 8-10%, and water cut is as high as 60%, which is equally recoverable compared with medium and high permeability oil fields When the water cut is only below 40%, the problem of low recovery and high water cut in low permeability oilfields is very ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/524C09K8/506C09K8/54E21B43/22
CPCC09K8/506C09K8/524C09K8/54C09K2208/32E21B43/16
Inventor 张相春邢艳斌赵晨李昂张国华张鑫邢志辉孟高
Owner 西安石油大油气科技有限公司