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Foam profile control agent applicable to oil field in-depth profile control

A profile control agent and foam technology, which is applied to drilling compositions, chemical instruments and methods, etc., can solve the problems of low salinity, single function of profile control technology, low plugging degree, etc. The effect of not polluting the environment

Active Publication Date: 2012-06-27
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the commonly used profile control technologies at home and abroad mainly include the following types: weak gel deep profile control technology, which is the most widely used type at home and abroad, but it is sensitive to temperature and salinity and has strong pertinence, but its application range is not enough wide; colloidal dispersion gel deep profile control and displacement technology, the gel forming conditions of this technology are harsh, suitable for low salinity and low plugging degree; volume expansion gel particle deep profile control technology, this technology is not limited by oilfield water quality conditions, The profile control effect is better for oil fields with high water cut and large pores; oily sludge deep profile control technology has been successfully applied in Jianghan, Shengli and other oil fields, but it is not easy to popularize due to the limitation of raw materials; microbial deep profile control technology has harsh application conditions, especially water quality Strict requirements, Dagang, Jilin and other oilfields have applications
The existing profile control technology has a single function and cannot meet the actual needs of oilfield development

Method used

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  • Foam profile control agent applicable to oil field in-depth profile control
  • Foam profile control agent applicable to oil field in-depth profile control
  • Foam profile control agent applicable to oil field in-depth profile control

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] This example provides two chromium crosslinked polymer solutions, the composition of which is shown in Table 1.

[0028] These two chromium crosslinked polymer solutions were prepared according to the following steps:

[0029] At 45°C, 1 g of partially hydrolyzed polyacrylamide (molecular weight: 16 million, degree of hydrolysis: 23%) was dissolved in 991.42 g of water, and stirred with a mixer for 2 hours to completely dissolve to obtain a partially hydrolyzed polyacrylamide solution;

[0030] Repeat the above steps to prepare a partially hydrolyzed polyacrylamide solution;

[0031] To a portion of the partially hydrolyzed polyacrylamide solution, add 5g of sodium fatty alcohol polyoxyethylene ether sulfate, 2.4g of sodium chloride, 0.1g of chromium acetate, and 0.08g of thiourea in sequence, and continue stirring for 1 hour to make it evenly mixed to obtain Chromium cross-linked polymer solution numbered 1;

[0032] To another part of the partially hydrolyzed polyac...

Embodiment 2

[0038] This example provides two aluminum cross-linked polymer solutions, the composition of which is shown in Table 1.

[0039] These two aluminum crosslinked polymer solutions were prepared according to the following steps:

[0040]At 45°C, 1 g of partially hydrolyzed polyacrylamide (molecular weight: 16 million, degree of hydrolysis: 23%) was dissolved in 991.47 g of water, and stirred with a mixer for 2 hours to completely dissolve it to obtain a partially hydrolyzed polyacrylamide solution;

[0041] Repeat the above steps to prepare a partially hydrolyzed polyacrylamide solution;

[0042] To a part of the hydrolyzed polyacrylamide solution, add 5g fatty alcohol polyoxyethylene ether sodium sulfate, 2.4g sodium chloride, 0.05g aluminum citrate, 0.08g thiourea in sequence, and continue to stir for 1 hour to make it evenly mixed. Obtain the aluminum cross-linked polymer solution numbered 1;

[0043] In another part of the partially hydrolyzed polyacrylamide solution, add 5...

Embodiment 3

[0049] This example provides two chromium citrate cross-linked polymer solutions, the composition of which is shown in Table 1.

[0050] These two chromium citrate crosslinked polymer solutions were prepared according to the following steps:

[0051] At 45°C, dissolve 0.6g of partially hydrolyzed polyacrylamide (molecular weight: 16 million, degree of hydrolysis: 23%) and 0.4g of partially hydrolyzed polyacrylamide (molecular weight: 25 million, degree of hydrolysis: 23%) in 991.4g of water, stir with a mixer 2 hours, make it dissolve completely, obtain the partially hydrolyzed polyacrylamide solution;

[0052] Repeat the above steps to prepare a partially hydrolyzed polyacrylamide solution;

[0053] To a part of the hydrolyzed polyacrylamide solution, add 5g fatty alcohol polyoxyethylene ether sodium sulfate, 2.4g sodium chloride, 0.1g chromium citrate, 0.1g thiourea in sequence, and continue to stir for 1 hour to make it evenly mixed. Obtain the sodium dichromate cross-lin...

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Abstract

The invention provides a foam profile control agent applicable to oil field in-depth profile control. The foam profile control agent provided in the invention comprises a polymer cross-linking solution and gas; under formation pressure, a volume ratio of the gas to the polymer cross-linking solution is 0.2: 1 to 1: 1; and the polymer cross-linking solution of the foam profile control agent comprises, by weight, 0.3 to 1.2 wt% of a surfactant, 0.01 to 0.8 wt% of a polymer, 0.001 to 0.2 wt% of a cross-linking agent, 0.001 to 0.1 wt% of a stabilizing agent and 0.05 to 1.5 wt% of inorganic salt, with the balance being water. The foam profile control agent has an effect on delaying cross-linking, can effectively plug a high-permeability zone, can reduce oil-water interfacial tension and has the effects of enlarging swept volume and improving oil displacement efficiency.

Description

technical field [0001] The invention relates to a foam profile control agent suitable for water plugging, profile control and oil displacement in oil fields, in particular to a foam profile control agent for depth profile control in oil fields. Background technique [0002] With the development of oilfields, the intralayer and interlayer contradictions in heterogeneous multi-layer sandstone oilfields are further intensified. In the process of water flooding and polymer flooding, in the case of co-injection and production of oil layers with different permeability, the injected water and polymer advance along the high-permeability layer, forming a single-layer intrusion in the vertical direction and tongue intrusion in the plane. This results in premature breakthrough of the injected water and polymer, resulting in low sweep of the middle and low permeability layers and poor oil displacement effect. In order to increase the producing degree of medium and low permeability oil ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/594
Inventor 刘宏生王景芹曹瑞波吕昌森武力军许关利
Owner PETROCHINA CO LTD
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