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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 high cost, inability to effectively develop thick oil layers with low permeability, low efficiency of injected water, etc., and achieve low cost , increase stability, and improve crude oil production

Inactive Publication Date: 2007-07-11
DAQING OILFIELD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Embodiment 1, laboratory experiment:

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

[0012] Experimental method: The foaming volume and half-life were evaluated by Waring Blender method.

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

[0014] Table of foaming volume and half-life of gel foam 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 the gel system and the concentration of fo...

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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 underground rock drilling in the field of oil recovery, and belongs to a gel for blocking large pores. Background technique: [0002] In heterogeneous sandstone oilfields developed by water flooding, due to serious heterogeneity and long-term erosion of injected water, the pore structure of the reservoir has undergone major changes, and a high-permeability zone with a high degree of water washing has formed in the oil layer. Channeling along the high permeability zone causes inefficient and ineffective circulation of the injected water, reduces the oil displacement efficiency of the injected water, and seriously affects the development benefits of the oilfield. For the plugging of low-efficiency and ineffective circulation of injected water in high-permeability zones in oil layers, various types of depth profile control research have been carried out in various oil fields, including various types of...

Claims

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Application Information

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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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