Spacer fluid for permeselective plugging agent and method of use thereof

A spacer fluid and selective technology, applied in the field of spacer fluid, can solve the problems of reduced coagulation performance, short plugging time, and low degree of sweeping of low-permeability layers, so as to prevent incomplete curing, prolong plugging time, and enhance plugging effect of effect

Active Publication Date: 2018-02-16
DANO BEIJING OILFIELD SERVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Most of the oilfields in China have entered the water injection development mode. Long-term water injection development, due to the heterogeneity of the reservoir, the difference in the viscosity of oil and water, and the imbalance in the oil-water well group, will inevitably lead to the injection of water. The high-permeability zone breaks in and channels to the production well, while the low-permeability layer is swept to a low degree, resulting in low circulation efficiency of injected water
People have been seeking to use various technologies and means to increase oil recovery. Among them, water plugging in oil wells and profile control in water injection wells have been widely used as effective technical means. Dilution reduces coagulation performance and poor plugging effect; slag is easy to run out during the displacement process, which affects subsequent processing operations, damages equipment, and short plugging time, etc.

Method used

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  • Spacer fluid for permeselective plugging agent and method of use thereof
  • Spacer fluid for permeselective plugging agent and method of use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] This example involves several groups of spacers for permeation-selective plugging agents, and the formulations are shown in the table below:

[0018]

[0019] According to the formula in the above table, add the three kinds of materials into the water one by one, mix and stir evenly to obtain the spacer for permeation selective blocking agent.

Embodiment 2

[0021] This example relates to the test on the effect of the spacer in Example 1.2.

[0022] Preparation before construction:

[0023] ①. Pull out the production string in the well, remove wax, and measure;

[0024] ②. The lower scraping pipe string, the lower sand flushing pipe string, the clean water flushes the sand to the bottom of the artificial well, and circulates the well to achieve the same water quality at the inlet and outlet;

[0025] ③. Start the sand flushing string, squeeze the injection string, install the wellhead, expand the packer, and pull out the dead core;

[0026] ④. Squeeze the injection equipment to the well site, connect the equipment and pipelines, prepare the spacer fluid for the permeable selective plugging agent according to the formula in Example 1.2; add 0.5 g of sodium hydroxycarboxylate, 2 g of sodium nitrite, and lithium aluminum silicon to 400 g of water in sequence 20g salt, 8g acrylamide copolymer, 10g oil well cement (average particle s...

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Abstract

The invention relates to a spacer fluid for a penetrating selective plugging agent. The spacer fluid is prepared from the following components in parts by weight: 1-5 parts of sodium hydroxide, 5-10 parts of sodium montmorillonite, 0.05-0.1 part of sodium hexametaphosphate and 100 parts of water. The spacer fluid for the penetrating selective plugging agent is used together with a plugging agent, so that the plugging effect of the plugging agent can be effectively enhanced; and the plugging ageing is prolonged. According to the application method, operation of the spacer fluid for the penetrating selective plugging agent is carried out before and after the plugging agent is squeezed; stratum is treated; the stratum environment is improved; the risks that the plugging agent is diluted and interfered, and is difficult to solidify are reduced; the construction safety is ensured; and the plugging capacity is improved.

Description

technical field [0001] The invention relates to a spacer, in particular to a spacer for a permeation-selective blocking agent, and at the same time, the invention also relates to a method for using the spacer for a permeation-selective blockage. Background technique [0002] Most of the oilfields in China have entered the water injection development mode. Long-term water injection development, due to the heterogeneity of the reservoir, the difference in the viscosity of oil and water, and the imbalance in the oil-water well group, will inevitably lead to the injection of water. The high-permeability strip breaks in and channels to the production well, while the degree of sweeping to the low-permeability layer is low, resulting in low circulation efficiency of injected water. People have been seeking to use various technologies and means to increase oil recovery. Among them, water plugging in oil wells and profile control in water injection wells have been widely used as effe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/50E21B33/13
CPCC09K8/5045C09K8/5083C09K2208/18E21B33/138
Inventor 潘卫国
Owner DANO BEIJING OILFIELD SERVICES
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