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Dibasic composite horizontal well bottom water plugging technique

A technology of binary compounding and process method, which is applied in chemical instruments and methods, earthwork drilling, sealing/isolation, etc., can solve the problems of unpublished binary compound plugging horizontal bottom water technology, etc., and achieve water shutoff The effect is obvious, the injection amount of plugging agent and the plugging distance are increased, and the effect of improving the sweep coefficient

Inactive Publication Date: 2008-03-12
LIAOHE GASOLINEEUM EXPLORATION BUREAU
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  • Application Information

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Problems solved by technology

Non-patent literature: Oilfield Chemistry, Vol. 14, No. 3, Application of Quincinol in Polymer Glue Water Shutoff Technology (pp. 286-289), Petroleum Drilling and Production Technology, Vol. 29, No. 1, Water Shutoff with Fractured Liner 40~43 pages); foreign oilfield engineering 2003 No. 8 horizontal well section water shutoff new technology (21~22 pages), Petroleum Science and Technology Forum 2004 my country oilfield water shutoff profile control technology development and thinking (41~47 Page), all disclose a kind of profile control agent formula that comprises polyacrylamide, resorcinol, urotropine, but above-mentioned document all does not disclose the report of binary composite plugging horizontal bottom water process method

Method used

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  • Dibasic composite horizontal well bottom water plugging technique

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Experimental program
Comparison scheme
Effect test

Embodiment 2

[0035] The plugging water cone 3 has a treatment radius of 3-5 meters, and the gel is commonly used in the improved PIA-605 oil field;

Embodiment 3

[0037] Each component of described gel consists of, by weight fraction:

[0038] Group ratio

[0039] Polyacrylamide (degree of hydrolysis: 20%, molecular weight: 15 million) 0.6-1.0

[0040] Resorcinol (industrial grade) 0.03-0.08

[0041] Urotropine (industrial grade) 0.20-0.30

[0042] When it is prepared, it will form light yellow strong gel at 40~130℃, the viscosity is greater than 8×10 4 mPa·S, maximum mineralization resistance 2×10 3 mg·L -1 , the dosage is 600-1800m 3 The blocking rate is greater than 80%;

Embodiment 4

[0044] When preparing, it is prepared for the on-site ground tank, first dissolve resorcinol and urotropine with clean water, then add polyacrylamide and inject it into the formation with a cement truck; after the gel is injected, it passes through the casing in the well Inject nitrogen, and finally seal with nitrogen foam to complete the plugging construction, so that the gel system enters the far-reaching reservoir to form a partition 6 and a plugging water cone 3, which can improve the water plugging effect (Fig. 2).

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Abstract

The invention relates to a water block operation method for horizontal wells, in particular to a binary composite technique method of sealing and water block for horizontal well downholes; the invention is characterized in that dynamic and static data of wells under execution are analyzed prior execution, in order to determine filler consumption into a binary system; then, perform well killing with fresh water before filling forced hardening flue, mixed in certain proportion of polyropylene amide, resorcinol and urotropine, and nitrogen into the well through the oil pipe; form a partition board with the filled nitrogen, and block off the water cone formed by bottom water layer in the horizontal well; the method can both improve utilization rate of medium and low permeation layers, and effectively control high permeation water content, in order to reach the target of improve collection rate of horizontal wells. The method in particular adapts to blocking for high-permeation water bearing layers in horizontal wells.

Description

Technical field: [0001] The invention relates to a horizontal well water plugging operation method, in particular to a binary compound plugging horizontal well bottom water process method. Background technique: [0002] The oilfield development enters the middle and late stage. In order to maintain the energy of the formation, the purpose of oil displacement is achieved by continuously injecting water into the formation. Due to the heterogeneity of the oilfield formation, the injected water preferentially enters the high-permeability layer area, so that it will not reach the area, or even form In the dead oil area, the injected water advances along the high-permeability area, forming a vertical single-layer intrusion and advancing from the horizontal to the edge and bottom water, so that the water cut of the oil well rises and the speed is accelerated. In addition, in order to improve the recovery rate, horizontal well oil production technology has appeared in recent years. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/138C09K8/50
Inventor 李昌绵段宪余袁兆坤田维钟富林田大亮罗胜勇杨帆王伟孙红玉王超何晓明
Owner LIAOHE GASOLINEEUM EXPLORATION BUREAU
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