On-line depth profile control method for improving oil displacement effect of polymer of offshore production well

A technology for deep profile control and offshore oilfields, applied in earth-moving drilling, wellbore/well components, production fluids, etc., and can solve problems such as formation permeability and porosity constraints

Inactive Publication Date: 2009-09-30
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

Despite the success of this technique, there are limitations, whi

Method used

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  • On-line depth profile control method for improving oil displacement effect of polymer of offshore production well
  • On-line depth profile control method for improving oil displacement effect of polymer of offshore production well
  • On-line depth profile control method for improving oil displacement effect of polymer of offshore production well

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Embodiment Construction

[0037] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0038] 1. Freezing mechanism of deep profile control fluid

[0039] The commonly used phenolic resin cross-linking agent adopts phenol or its substitute hydroquinone, resorcinol, formaldehyde or its substitute urotropine, and the cross-linking polymer is based on the scene with a hydrophobic association water-soluble polymer ( AP-P4), the use of phenolic resin precondensation polymer as a crosslinking agent, thereby reducing the volatilization and toxicity of the monomer and thus meeting the environmental protection requirements of offshore oilfield development, the molecular structure of the phenolic resin crosslinking agent is

[0040]

[0041] —CH in phenolic resin crosslinking agent 2 OH through hydrophobic association with —CONH in the water-soluble polymer (AP-P4) 2 The dehydration reaction acts as a cross-linking effect, forming a jelly with...

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Abstract

The invention provides an on-line depth profile control method for improving the oil displacement effect of polymer of an offshore production well. Phenolic resin crosslinker is added to form a depth profile control system in the process of polymer flooding of the offshore production well, and by adjusting the mass concentration of the phenolic resin crosslinker, time of jelly glue formation of the depth profile control system and the different depth profile control system retaining positions in an oil deposit are changed so as to block high permeability zones or large pore paths in the polymer flooding oil deposit, thereby expanding the waves and the volume of subsequently injected polymer, increasing the utility ratio of the polymer, improving the effect of development of the polymer flooding and increasing the recovery ratio of crude oil. The depth profile control system has low viscosity and favorable fluidity, can be injected into the deep part of the oil deposit; and after being frozen, enables the sequentially injected polymer to move to low permeability zone so as to play the function of deep profile and has the advantages of favorable thermal stability, long period of validity of deep profile, and the like.

Description

Technical field: [0001] The invention relates to a method for further improving the crude oil recovery rate of an offshore polymer flooding oil field in the technical field of oil and gas field development engineering. technical background: [0002] Polymer flooding in the Bohai Oilfield has been proven to achieve obvious results. However, due to the limitations of the reservoir and ground conditions in the Bohai Oilfield, compared with onshore oilfields, it is necessary to further improve the matching technology of polymer flooding to improve the effect of polymer flooding. Due to the large well spacing, thick oil layers, many layers, and serious heterogeneity in the Bohai Oilfield, the polymer solution escapes into the oil well along the high permeability layer, resulting in a low sweep coefficient, which reduces the development effect of polymer flooding. In order to solve this problem, we must adopt the method of profile control and water blocking to improve the water ab...

Claims

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Application Information

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IPC IPC(8): E21B43/22
Inventor 王业飞周薇冯其红向问陶由庆赵文森于海洋杨光
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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