Microemulsion heavy wax crystal emulsifying dispersant applied to oil well for tertiary oil recovery

A technology of emulsifying dispersant and microemulsion, which is applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of high back pressure in oil production wells, short hot washing cycle, etc., achieve stable performance, reduce condensate viscosity, etc. The effect of small wall volume and odor toxicity

Inactive Publication Date: 2014-03-05
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to overcome the problems in the background technology that serious wax formation in oil wells leads to high back pressure in oil produc

Method used

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  • Microemulsion heavy wax crystal emulsifying dispersant applied to oil well for tertiary oil recovery
  • Microemulsion heavy wax crystal emulsifying dispersant applied to oil well for tertiary oil recovery
  • Microemulsion heavy wax crystal emulsifying dispersant applied to oil well for tertiary oil recovery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] 3g compound emulsifier preparation: weigh 1.9g sodium oleate, 1.1g C 18 Mixture of unsaturated olefinic acids;

[0014] Weigh 2g of SAM, 3g of composite emulsifier, 18g of xylene, 12g of sodium sulfonate, 12g of methanol, 20g of 1009-2 type demulsifier, 33g of water, and mix to prepare a heavy wax crystal emulsifying dispersant.

Embodiment 2

[0016] 3.5g compound emulsifier preparation: weigh 2.2g sodium oleate, 1.3g C 18 Mixture of unsaturated olefinic acids;

[0017] Weigh 2g of SAM, 3.5g of composite emulsifier, 25g of xylene, 10g of sodium sulfonate, 10g of methanol, 20g of 1009-2 type demulsifier, 29.5g of water, and mix to prepare a heavy wax crystal emulsifying dispersant.

[0018] The on-site application effect evaluation of the microemulsion heavy wax crystal emulsifying dispersant applied to tertiary oil recovery oil wells is as follows:

[0019] The effect of this microemulsion heavy wax crystal emulsifying and dispersing agent in Daqing Oilfield No. 6 Oil Production Plant and No. 7 Oil Production Plant compared with traditional agents is shown in Table 1:

[0020] Table 1

[0021]

[0022] The current increase of the L3-PS2627 poly-flooding screw pump oil production well of No. 6 Plant has been effectively controlled, and it can operate normally after the bottom of the well is closed and mixed with...

example 1

[0027] Example 1 and Example 2 have good application effects. Example 2 is applied to the polymer flooding of Plant No. 6 and Plant No. 4, and the wax control rate is greater than 91.5%. Example 1 is applied to water flooding pumping wells in peripheral oil fields. The wax control rate is greater than 77%.

[0028] 2. See Table 3 for the evaluation of the dispersion performance of wax crystals

[0029] Triangular flask with lid, constant temperature water bath, 10-mesh standard sieve (aperture 2mm), electronic balance, 58 # Industrial white wax

[0030] table 3

[0031]

[0032] The wax crystal dispersion rate of the microemulsion wax crystal emulsifying dispersant is 95%, which is higher than the standard value of more than 80%.

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Abstract

The invention relates to a microemulsion heavy wax crystal emulsifying dispersant applied to an oil well for tertiary oil recovery, and is mainly used for solving the problem that the oil production rate is influenced due to the high return pressure and the short thermal washing period of the oil recovery well caused by that serious wax precipitations are generated by the oil well which contains thickened oil and is high in polymer flooding and viscosity. The emulsifying dispersant is prepared from the following components by weight percent: 1% to 3% of high-molecular polymer wax inhibitor, 13% to 25% of organic aromatic solvent, 1% to 3.5% of emulsifying agent, 8% to 12% of sulfonate, 10% to 12.5% of alcohol, 10% to 20% of demulsifier and 25% to 35% of water. The emulsifying dispersant has the dual effects of eliminating and preventing the waxy bitumen colloid precipitations with long molecular chains or high carbon number in crude oil from being precipitated, so that the wall sticking quantity of condensate oil is greatly decreased; the running load of the oil well is reduced; and the well washing period is prolonged. Thus, the oil production rate is improved.

Description

Technical field: [0001] The invention relates to the technical field of oil field tertiary oil recovery oil well chemical wax removal and prevention, in particular to a microemulsion heavy wax crystal emulsifying dispersant applied to tertiary oil recovery oil wells. Background technique: [0002] For oilfields in alpine regions, crude oil has high wax content and high freezing point. As the oilfield development enters the later stage, the heavy components in the mixed liquid of the oil well increase, the wax deposition in the oil well and pipeline is serious, and the deposited asphaltenes and waxes have high carbon number and hard quality. , It is difficult to remove, especially in polymer flooding screw pump production wells, the wax deposition is serious. Conventional surfactant-based wax inhibitors have no wax removal effect and slow onset. Although most of the tertiary oil recovery wells have high water content, only a small amount of oil is seriously attached to the wa...

Claims

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Application Information

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IPC IPC(8): C09K8/524
CPCC09K8/524
Inventor 张爱兰周子豪梁利民
Owner BC P INC CHINA NAT PETROLEUM CORP
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