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Macropore plugging gelatin

A technology of large pores and gel, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of ineffective development of low-permeability parts of thick oil layers, high cost, low efficiency of injected water, etc., and achieve low cost , Increased crude oil output and small treatment radius

Inactive Publication Date: 2009-05-20
DAQING OILFIELD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

The field practice results show that although these deep profile control have improved the problem of low efficiency and ineffective circulation of injected water in the high permeability zone of the oil layer to a certain extent, there are still some problems: 1. Any deep profile control formula system cannot be effective 2. The deep profile control formula system requires a large effective radius in order to see the obvious effect of oil increase and water reduction, and the cost is high

Method used

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  • Macropore plugging gelatin
  • Macropore plugging gelatin
  • Macropore plugging gelatin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Embodiment 1, laboratory experiment:

[0011] 1. Foaming volume and half-life:

[0012] Experimental method: Waring Blender method was used to evaluate foam volume and half-life.

[0013] Weigh 100ml of gel foam solution, stir with a high-speed mixer at 3000r / min for 60s, pour the foam into a graduated cylinder, read the foam height, that is, the foam volume. At the same time, the time required to reduce the amount of foam by half and the time for half of the solution to precipitate out, namely the foam half-life and the liquid half-life, were recorded.

[0014] Gel foam foam volume and half-life table Table 1

[0015]

Solution concentration volume before foaming

(ml) Volume after foaming

(ml) liquid half-life

(min) foam half-life

(min) 1500ppmN+0.8%F 100 510 24 238

[0016] 2. Screening of the concentration of gel system and the concentration of foaming agent sodium dodecylbenzenesulfonate:

[0017] In the e...

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Abstract

The invention discloses a gel to block large-hole channel, which comprises the following parts: nitrogen and liquid with bulk rate at 2: 1, wherein the liquid is composed of 0.8% sodium dodecylbenzene sulfonate, 0.15% polyacrylamide, 0.3% thiourea, 2% calcium chloride, 1% chromic acetate, 0.1% bactericide and water.

Description

Technical field: [0001] The invention relates to an auxiliary agent used for mining after drilling downhole rocks in the field of oilfield oil production, belonging to a gel for plugging large pores. Background technique: [0002] Heterogeneous sandstone oilfields developed by water flooding, due to serious heterogeneity and long-term scouring of injected water, the pore structure of the oil reservoir has undergone great changes, and a high-permeability zone with high water washing degree is generated in the oil layer. Channeling along the high-permeability zone causes inefficient and ineffective circulation of injected water, reduces the oil displacement efficiency of injected water, and seriously affects the development benefits of oilfields. For the plugging problem of inefficient and ineffective circulation of injected water in the high permeability zone in the oil layer, various types of deep profile control research have been carried out in various oil fields, includin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/467
Inventor 刘合周万富王鑫刘向斌韩重莲
Owner DAQING OILFIELD CO LTD
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