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Method for releasing oil field from blockage caused by high molecular polymer

A high molecular polymer, oil field technology, used in earth-moving drilling, production of fluids, wellbore/well components, etc., can solve the problems of increasing injection pressure, affecting crude oil production, and reducing the amount of injected liquid, to promote thermal degradation, The effect of protecting the blockage removal effect and reducing the treatment cost

Inactive Publication Date: 2004-03-10
胡新锁
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This kind of clogging has an extremely adverse effect on chemical flooding, which can lead to a significant increase in injection pressure and a significant decrease in the amount of injected liquid, affecting crude oil production.

Method used

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  • Method for releasing oil field from blockage caused by high molecular polymer
  • Method for releasing oil field from blockage caused by high molecular polymer

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Effect test

Embodiment 1

[0017] Embodiment 1: Treating a severely blocked polymer injection well, the effective thickness of the oil layer is h10 meters, the design treatment radius is r5 meters, and the porosity percentage of the oil layer is φ20%. Its plugging removal step: the first step is to inject 157 cubic meters of hydrolysis catalyst ADS 0.3%-1.2% sodium hydroxide aqueous solution into the unblocked oil layer with a pump, and the temperature is above 90°C. After the high molecular polymer is injected into the oil layer, thermal degradation reactions can usually occur at high temperatures, for example, hydrolyzed polyacrylamide begins to degrade above 85°C, and there will be obvious degradation at 90°C to 110°C. In the present invention The temperature of the injected solution is above 90°C, which can achieve a certain deblocking effect, and the presence of the catalyst sodium hydroxide can further increase the degree of hydrolysis of polyacrylamide, that is, the number of negatively charged ch...

Embodiment 2

[0019] Embodiment 2: Treating an obviously blocked polymer injection well, the effective thickness of the oil layer is h12 meters, the design treatment radius is r8 meters, and the porosity percentage of the oil layer is φ10%. Its plugging removal step: the first step is to inject 240 cubic meters of hydrolysis catalyst ADS 0.3%-1.2% potassium hydroxide aqueous solution into the unblocked oil layer with a pump, and the temperature is above 90°C. Then perform the second step of injecting 250 cubic meters of aqueous solution of nanomolecular film agent HB 0.1%-0.5% modified alkylsiloxane polyoxyethylene ether, and the solution temperature is normal temperature. During the unblocking process, the well was sealed for 48 hours.

Embodiment 3

[0020] Embodiment 3: Treating an obviously blocked polymer injection well, the effective thickness of the oil layer is h9 meters, the design treatment radius is r6 meters, and the porosity percentage of the oil layer is φ25%. Its plugging removal steps: the first step is to pump 254 cubic meters of strong oxidant SDT 0.1%-5% chlorine-containing polycyanic acid aqueous solution into the unblocked oil layer, the solution temperature is normal temperature, and add the steering agent BSN-sulfamic acid 9 Kilogram. In the second step, 254 cubic meters of aqueous solution of nanomolecular film agent HB 0.1%-0.5% modified alkylsiloxane polyoxyethylene ether is injected, and the solution temperature is normal temperature. During the unblocking process, the well was sealed for 48 hours.

[0021] In the present invention, the plugging removal step C can be carried out before step A, that is to say, it is carried out before the polymer injection well is flooded with high molecular polyme...

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Abstract

A method for removing the plug of high-molecular polymer in oil field includes injecting high-temp aqueous solution of ADS as hydrolyzing catalyst for promoting the hydrolyzing and thermodecomposing reaction of high-molecular polymer, adding the aqueous solution of SDT as strong oxidant for oxidizing degradation, reaction to lower the molecular weight of said polymer, using BSN as pilotting agent for forcing the injected liquid to come in low-osmosis region, and injection nano molecular filming agent HB for improving the lubrication of stratum.

Description

technical field [0001] The invention relates to a method for unblocking high molecular polymers in oilfields. Background technique [0002] At present, various high molecular polymers are widely used in the process of chemical flooding in oil fields, such as partially hydrolyzed polyacrylamide (HPAM), xanthan gum (XC), natural polymers and their modified products. However, at the bottom of the well, especially in the near-well zone of the oil layer, due to the adsorption, capture and bridging of polymers by the rock formation, part of the injected material stays in the pores of the rock formation, forming different degrees of blockage. This kind of clogging has an extremely adverse effect on chemical flooding, which can lead to a substantial increase in injection pressure and a significant reduction in the amount of injected liquid, affecting crude oil production. [0003] The object of the present invention is to provide a method for unblocking oilfield polymers, which can...

Claims

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Application Information

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IPC IPC(8): E21B43/22
Inventor 胡新锁
Owner 胡新锁
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