Chemical regulator for stratified waterflooding in water injection well and stratified water amount regulating construction method

A technology of conditioner and water injection well, which is applied in earth-moving drilling, wellbore/well components, and production fluids, etc., can solve the problems of layered water injection limitation and high construction cost, and achieves small injection volume, low cost, and convenient blockage removal. Effect

Inactive Publication Date: 2006-02-08
孙广森 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of these two methods are: ① layered water injection is limited by the wellbore structure
③ The amount of chemical profile control injection profile control agent ranges from 50-60 cubic meters to thousands of cubic meters, and the construction cost is very high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: use 15% of 100# high-pressure polyethylene, 55% of oxidized bitumen, 18% of 58# paraffin, and all the other are mineral spirits. A chemical regulator with a particle size of 0.5-1.0mm and a softening point of 158°C is made.

Embodiment 2

[0017] Example 2: A certain oilfield uses chemical regulators to carry out water diversion operations on J367 well. The water injection section of this well has 7 layers 26 meters thick, 260 perforation holes, the average temperature of the oil layer is 137°C, and the normal water injection pressure is 27MPa. Chemical Modulator in Example 1. The design injection pressure is 30MPa, and the design injection chemical regulator is 2600kg. Use clear water containing 0.1% sodium dodecylbenzenesulfonate surfactant as the carrier fluid, the concentration is 120kg / m 3 , when 1800kg of chemical regulator is injected, the wellhead pressure rises from 30MPa to 33MPa, and the normal water injection production is transferred after the replacement of clean water. The comparison of layered water absorption before and after construction is shown in Table 1 below:

[0018] Compared

[0019] It can be seen from the above table that the relative water absorption of the 4 sublayers in...

Embodiment 3

[0020] Embodiment 3: use 10% of 100# high-pressure polyethylene, 45% of oxidized bitumen, 18% of 58# paraffin, and all the other are mineral spirits. A chemical regulator with a particle size of 0.8-1.2mm and a softening point of 110°C is made.

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PUM

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Abstract

The laminated water injection amount chemical regulator for water injecting well is hot molten re-compounded solid resin comprising main chemical and assistant, and is water insoluble, acid insoluble, oil soluble and thermoplastic. It is processed into grains and injected into water injecting well together with pumped carrying liquid. It is absorbed in more quantity in the well water absorbing stratum than in the less water absorbing stratum and is thermoplastic, so that it can regulate water injecting quantity in different stratums automatically. The present invention has the advantages of no need of tool set to well, expanded application range, no entering and no contamination to stratum while blocking holes, low cost and easy unblocking.

Description

technical field [0001] The invention relates to a chemical regulator and a construction method for automatically adjusting layered water injection volume in water injection wells in the field of oil field exploitation, in particular to a chemical regulator made by mixing thermoplastic organic resins that are insoluble in water, insoluble in acids and easily soluble in oil And a construction method for automatically adjusting layered water injection volumes of water injection wells by using chemical regulators. Background technique [0002] There are two commonly used methods for adjusting the water injection volume of oilfield water injection wells: one method is called layered water injection; it uses a mechanical downhole layered water injection string composed of a packer and a water distributor to separate different water injection layers. Section, the method of adjusting the water injection volume of different water injection layers by replacing the water nozzles corres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/16E21B43/20E21B43/22
Inventor 孙广森高运宗
Owner 孙广森
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