A low fluid loss secondary cross-linked gel modifier

A technology of secondary cross-linking and adjusting the displacement agent, which is applied in the drilling compositions, chemical instruments and methods, etc., can solve the problems such as difficulty in effectively plugging fracture channeling channels, poor injection ability, and difficulty in gel formation, etc. The effect of reliable synthesis principle, reduced economic feasibility and convenient on-site configuration

Active Publication Date: 2020-03-20
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For low-temperature reservoirs, ordinary gel systems have problems such as difficult gel formation, low strength, poor injection capacity, and difficulty in effectively sealing fracture channeling channels under low-temperature environments.

Method used

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  • A low fluid loss secondary cross-linked gel modifier
  • A low fluid loss secondary cross-linked gel modifier
  • A low fluid loss secondary cross-linked gel modifier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] N, the preparation steps of N-dimethyl-polyamido-amine are as follows:

[0027] Step 1. Dissolve 17.2g of methyl acrylate in 80ml of methanol and add it to a three-necked bottle with a magnetic rotor under ice-salt bath conditions. Turn on the magnetic stirrer. When the solution of methyl acrylate in the three-necked bottle is cooled When the temperature reaches 0-2°C, slowly add 3.3g of ethylenediamine dropwise into the methanol solution of methyl acrylate under the stirring condition of rotating speed of 90-120r / min. The reaction was slowly stirred for at least 48 hours under the conditions, and then the reactant was subjected to two-stage vacuum distillation at 40°C to remove excess methyl acrylate and methanol (recycling of methanol) to obtain a colorless transparent liquid, which is polyamide- Amine, yield 95%; Step 2, dissolving 11.4g of polyamide-amine in 60ml of methanol, ice-salt bath conditions, adding to a three-necked bottle with a magnetic rotor, turning on...

Embodiment 2

[0031] Using the N,N-dimethyl-polyamide-amine prepared in Example 1 as an activator, a secondary cross-linked gel control agent based on partially hydrolyzed polyacrylamide, the component ratio is: partially hydrolyzed polyacrylamide (HPAM) 0.25-0.35%, N,N-dimethyl-polyamide-amine 0.05%, hexamethylenetetramine 0.07%, phenol and formaldehyde mixture 0.25%, and the rest is water or brine.

[0032] After configuring the displacing agent into a gel base liquid, observe at 15°C for 6 hours to test the relationship between the viscosity and time of the primary cross-linking system; The gel code method was used to determine the relationship between the strength of the secondary gel and time. The measurement results are shown in Table 1. It can be seen that under the condition of 15°C, the primary gelation time is 4 hours, and the secondary gelation is carried out at 80°C for 20 days to form a final gel. The concentration of HPAM used is 0.25-0.35%, and the final gelation strength co...

Embodiment 3

[0039] Using the N,N-dimethyl-polyamide-amine prepared in Example 1 as the activator, the secondary cross-linked gel regulating agent based on the hydrophobic association polymer, its component ratio is: hydrophobic association polymer (HAPAM) 0.25-0.4%, N,N-dimethyl-polyamide-amine 0.03%, hexamethylenetetramine 0.10%, phenol and formaldehyde mixture 0.30%, and the rest is water or brine.

[0040] After configuring the displacing agent into a gel base liquid, observe the relationship between the viscosity and time of the primary cross-linking system at 20°C for 5 hours; then let the primary gel system stand at 90°C The glue code method was used to measure the relationship between the strength of the secondary gel and time, and the results are shown in Table 3. It can be seen that at 20°C, the first gelation time is 4h, and the second gelation is 30d at 90°C to form a final gel. The concentration of HAPAM used is 0.25-0.4%, and the final gelation strength code is F-G . Refer ...

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Abstract

The invention discloses a secondary cross-linked gel profile control and flooding agent with low filtration loss. The profile control and flooding agent is prepared from a main agent, an activating agent, a primary crosslinking agent, a secondary crosslinking agent and water, wherein the activating agent is N,N-dimethyl-polyamide-amine; the primary crosslinking agent is hexamethylene tetramine orresorcin; the secondary crosslinking agent is a mixture of phenol and formaldehyde; the main agent is one of partially hydrolyzed polyacrylamide, a comb type polymer, a hydrophobically associated polymer or a hyperbranched polymer; the profile control and flooding agent is prepared from the following components in percentage by mass: 0.075 to 0.4 percent of the main agent, 0.02 to 0.075 percent ofthe activating agent, 0.03 to 0.3 percent of the primary crosslinking agent, 0.02 to 0.5 percent of the secondary crosslinking agent and the balance of the water. A secondary cross-linked gel systemis convenient to prepare on the scene and has strong feasibility; the secondary cross-linked gel system can be widely applied to profile control and flooding of strong non-homogeneous oil deposit andimproving a water injection developing effect.

Description

technical field [0001] The invention belongs to the technical field of oil field chemistry, and in particular relates to a low fluid loss secondary cross-linked gel control and displacement agent. Background technique [0002] After years of water injection to develop old oil fields, it has entered the "double high stage" of high water cut and high water production. The contradiction between section and plane is prominent, water channeling is serious, and it is difficult to stabilize production. Gel control and flooding can effectively control the high-permeability zone, improve the liquid absorption profile of the formation, and improve the water injection development effect of mature oilfields. As the chemical flooding technology is moving towards the strategic direction of low-carbon, green, and energy-saving, the gel flooding technology with low concentration, controllable gelation time, stable performance, and low filtration loss has attracted extensive attention. Res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/512C09K8/58C09K8/588
CPCC09K8/512C09K8/58C09K8/588
Inventor 蒲万芬刘锐金发扬谭新李科星
Owner SOUTHWEST PETROLEUM UNIV
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