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Water blocking agent as well as preparation method and application thereof

A technology of water shutoff agent and stabilizer, which is applied in the field of oilfield water shutoff. It can solve the problems of poor high temperature resistance and salt resistance, failure to meet on-site injection requirements, short gelation time, etc., and achieve excellent high temperature resistance and salt resistance. Performance, suitable for large-scale production and promotion, and the effect of simple ingredients

Active Publication Date: 2019-06-11
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the gel-type water blocking agent prepared by partially hydrolyzed polyacrylamide and high-valent metal ions is currently the most widely researched and used water blocking agent, but its high temperature resistance and salt resistance are not good, so it is difficult to apply to Changqing Oilfield (formation temperature 80℃~100℃, formation water salinity 1.0×10 5 mg / L, CaCl 2 type), Tarim Oilfield (formation temperature 140°C, formation water salinity 2.3×10 5 mg / L, CaCl 2 type) and other reservoir conditions
In addition, some gel-type water blocking agents use low-molecular-weight aldehyde cross-linking agents. Fast, resulting in too short gelation time, unable to meet on-site injection requirements

Method used

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  • Water blocking agent as well as preparation method and application thereof
  • Water blocking agent as well as preparation method and application thereof
  • Water blocking agent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] This embodiment provides a water blocking agent, whose components and proportions are shown in Table 1.

[0046] The component distribution ratio of table 1 water blocking agent (total mass content is 100%)

[0047]

[0048] The preparation method of this water blocking agent comprises the following steps:

[0049] First, take simulated water and add it to the beaker, place the beaker under the stirrer, and the bottom of the stirring rod is about 1cm away from the bottom of the beaker. Turn on the stirrer switch, adjust the stirring speed, so that the simulated water forms a vortex, then add the partially hydrolyzed polyacrylamide into the beaker and continue stirring for about 2.5 hours until the partially hydrolyzed polyacrylamide is completely dissolved.

[0050] Next, under stirring, the antioxidant thiourea and the stabilizer cobalt chloride were uniformly and quickly added to the beaker until the antioxidant and the stabilizer were completely dispersed.

[00...

Embodiment 2

[0061] This embodiment provides a water blocking agent, whose components and proportions are shown in Table 2. The preparation method of this water blocking agent comprises the following steps:

[0062] First, mix the anhydrous sodium metasilicate and calcium chloride uniformly according to the mass ratio in Table 2, and set aside.

[0063] Secondly, take simulated water and add it to the beaker, place the beaker under the stirrer, and the bottom of the stirring rod is about 1cm away from the bottom of the beaker. Turn on the stirrer switch, adjust the stirring speed, so that the simulated water forms a vortex, then add the partially hydrolyzed polyacrylamide into the beaker and continue stirring for about 3.5 hours until the partially hydrolyzed polyacrylamide is completely dissolved.

[0064] Again, under constant stirring, the antioxidant and stabilizer were quickly and evenly added to the beaker, and after stirring evenly, the mixture of anhydrous sodium metasilicate and ...

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Abstract

The invention provides a water blocking agent as well as a preparation method and application thereof. The water blocking agent comprises the following components: 0.5-2% of partially-hydrolyzed polyacrylamide, 0.5-1.5% of an organic crosslinking agent, 0.02-0.75% of an antioxidant, 0.02-0.75% of a stabilizing agent, 0-0.5% of anhydrous sodium metasilicate, 0-0.2% of calcium chloride, and the balance of simulation water. According to the water blocking agent provided by the invention, through a reasonable ratio of the simple components, the obtained water blocking agent has suitable gelling time, has good heat stability, high strength and good salt tolerance after gel formation, and can satisfy requirements of some high-temperature high-salt special oil reservoir conditions.

Description

technical field [0001] The invention relates to a water shutoff agent and its preparation method and application, in particular to a gel-type water shutoff agent with high temperature resistance and salt resistance, which belongs to the technical field of oilfield water shutoff. Background technique [0002] At present, after decades of intensified exploitation, most oilfields in my country have entered the middle and late stages of exploitation, and some oilfields have entered the period of "high water cut, high input and low output". Especially for the western oilfields, due to the high oil production rate, the bottom water in the reservoir is coning, the oil wells break through water prematurely, and the water cut rises too fast. And most oil wells drop through years of production reservoir pressure, most of the well oil-water passage water outlet pressure is greater than the oil outlet pressure of the oil production layer. The problem of water outflow from oil wells wil...

Claims

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Application Information

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IPC IPC(8): C09K8/512
Inventor 周代余赵冀范坤杨子浩林梅钦董朝霞
Owner PETROCHINA CO LTD
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