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High-temperature resistant phenolic resin weak gel profile control plugging agent

A technology of profile control and water blocking agent and phenolic resin, which is applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of formation damage, poor oil-water selectivity, etc., achieve long validity period, high gel strength, improve freezing The effect of glue strength

Active Publication Date: 2012-07-11
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, some clay and cement-based inorganic particle water blocking agents on the market have many problems, mainly in the poor selectivity to oil and water, and cause different degrees of damage to the formation

Method used

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  • High-temperature resistant phenolic resin weak gel profile control plugging agent
  • High-temperature resistant phenolic resin weak gel profile control plugging agent
  • High-temperature resistant phenolic resin weak gel profile control plugging agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Example 1. Selective plugging performance test of profile control water shutoff agent on rock core

[0061] This embodiment provides a profile control water shutoff agent, which is prepared according to the following steps:

[0062] Slowly add 0.5 g of anionic polyacrylamide (the polyacrylamide has a molecular weight of 1200, a degree of hydrolysis of 23%, and a solid content of 90%) into 98.6 ml of water, stir and mature for 3 hours, and then add 0.8 g A new type of phenolic resin cross-linking agent and 0.1 g of ammonium nitrate were stirred completely, and then transferred to a constant temperature oven at 70°C for 24 hours to obtain a profile control water shutoff agent.

[0063] The above-mentioned profile control and water shutoff agent was tested for selective plugging performance on rock cores. In this test, for low-permeability reservoirs, cores from low-permeability reservoirs are selected, and their permeability is shown in Table 3.

[0064] table 3

[006...

Embodiment 2

[0075] Embodiment 2, plugging strength test

[0076] This embodiment provides a profile control water shutoff agent, which is prepared according to the following steps:

[0077] Slowly add 0.5 g of anionic polyacrylamide (the polyacrylamide has a molecular weight of 1200, a degree of hydrolysis of 23%, and a solid content of 90%) into 98.6 ml of water, stir and mature for 3 hours, and then add 0.8 g The new phenolic resin cross-linking agent and 0.1 g of ammonium nitrate were stirred completely, transferred to a constant temperature oven at 70°C, and kept warm for 24 hours to obtain the profile control water shutoff agent.

[0078] A gel plugging experiment was carried out on the above-mentioned profile control water shutoff agent, in which the plugging strength of the gel can be described by the breakthrough pressure, and the specific test steps are as follows:

[0079] 1. Saturate the core with water;

[0080] 2. Under the external pressure of 4MPa, inject profile control ...

Embodiment 3

[0086] Embodiment 3, the influence test of degree of salinity on gel cross-linking performance

[0087] This embodiment provides a profile control water shutoff agent, which is prepared according to the following steps:

[0088] Will weigh 0.5 g of anionic polyacrylamide (the molecular weight of the polyacrylamide is 1200, the degree of hydrolysis is 23%, and the solid content is 90%), slowly added to 98.6 ml of four different simulated brines (the concentration of brine is as follows: (shown in Table 4) was stirred and matured for 3 hours, then added 0.8 grams of new phenolic resin crosslinking agent and 0.1 grams of ammonium nitrate and stirred completely, transferred to a constant temperature oven at 70°C for 24 hours to obtain four different profile control and plugging Aqua (see Table 6).

[0089] Different qualities of sodium chloride and calcium chloride were added to distilled water to prepare simulated brine with different salinity, and the salinity was characterized...

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Abstract

The invention relates to a high-temperature resistant phenolic resin weak gel profile control plugging agent, which is a profile control plugging agent formed by reacting partially-hydrolyzed polyacrylamide and a cross-linking agent by acylamino of the hydrolytic polyacrylamide. The profile control plugging agent comprises the following components in percentage by weight: 0.25 to 1.2 percent of partially-hydrolyzed polyacrylamide, 0.2 to 1 percent of cross-linking agent, 0.01 to 1 percent of additive and the balance of water. According to the high-temperature resistant phenolic resin weak gel profile control plugging agent, the water plugging rate is more than 80 percent, the oil plugging rate is less than 30 percent, the profile control plugging agent can be resistant to high temperature of over 90 DEG C, mineralization resistance is up to 85,000 mg / L (on the basis of 80,000 mg / L of sodium chloride and 5,000 mg / L of calcium chloride), the strength of gel is high, breaking strength is improved by 68 percent compared with the prior art, the gel-formation time is adjustable, the aims of plugging high-permeability layers in strata and adjusting water absorption profiles of water injection wells deeply can be fulfilled, the deep profile control of oil layers is realized, and the recovery ratio of petroleum is improved greatly.

Description

technical field [0001] The invention relates to a high-temperature-resistant phenolic resin weak gel profile control and water shutoff agent for profile control and water shutoff in oil fields, and belongs to the technical field of profile control and water shutoff in oil layers in oil fields. Background technique [0002] In the process of oilfield development, due to the heterogeneity of the formation and the complexity of the reservoir formation in the oilfield developed by water injection, as the water injection volume increases, the inhomogeneity of the water injection profile increases, resulting in a large amount of water from the oil well, which seriously affects the water flooding. The development effect will affect the oil recovery rate of the oil field. [0003] In order to solve the above problems, the profile control and water shutoff technology of oil layers has gradually been paid attention to and developed in oil field development. Profile control and water ...

Claims

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Application Information

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IPC IPC(8): C09K8/42C09K8/588
Inventor 潘建华高本成李加庆赵云峰周洪涛尹华肖立新何勇陈小凯石磊
Owner PETROCHINA CO LTD
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