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Method for blocking strong water washing by injecting blocking agent into thick reservoir by means of fracture

A technology of plugging agent and thick oil layer, applied in the direction of sealing/isolation, earthwork drilling and production, wellbore/well parts, etc., it can solve the problem of poor plugging effect, short plugging distance and weak plugging of strong water washing strips and other problems, to achieve the effects of obvious plugging effect, decreased liquid production, and low equipment damage

Active Publication Date: 2017-05-31
PETROCHINA CO LTD +1
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Problems solved by technology

[0007] The present invention aims to overcome the problems of the existing conventional plugging method in the background technology that the plugging distance is relatively short and the plugging is not firm, resulting in poor plugging effect of the strong water washing strip, and provides a method of injecting a plugging agent into a thick strip using fracturing. The Method of Strong Water Washing Bar for Oil Layer Plugging

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  • Method for blocking strong water washing by injecting blocking agent into thick reservoir by means of fracture
  • Method for blocking strong water washing by injecting blocking agent into thick reservoir by means of fracture

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Embodiment 1

[0048] The present invention will be further described in conjunction with well B1-6-P68, a type of thick oil layer in Changyuan, Daqing.

[0049] Well B1-6-P68 is an old production well after polymer flooding, and it was drilled on October 10, 1996. The oil-water well spacing of this well is 175m, the well depth is 1166.71m, and the perforated section depth is 1068.9-1097.7m. A total of 9 sublayers from Pu I1 to Sa I7 have been penetrated, including the Pu I2 sublayer.

[0050] (1) Determine the target layer for plugging: According to reservoir logging interpretation, water flooding interpretation, fine description, profile test data, coring well data, and production dynamic data analysis, it is determined that the bottom 2.6m of the Pu I2 sublayer of the well is 1074.3 ~1076.9m is a strong water washing strip, which is determined as the target layer of this fracturing plugging construction, and multi-stage long rubber tubes are used for construction control;

[0051] (2) De...

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Abstract

The invention relates to a method for blocking strong water washing by injecting a blocking agent into a thick reservoir by means of a fracture. The problems that for an existing ordinary blocking method, the blocking distance is short, and blocking is not firm, so that the strong water washing strip blocking effect is poor is mainly solved. The method is characterized by comprising the following steps of 1 determining a target position of blocking, 2 determining the target position fracture blocking radius, 3 determining the dosage of a target position blocking agent, 4 determining the well fracture construction discharge capacity, 5 determining the pump injection construction process, 6 determining the fracture opening part and 7 blending and injecting the blocking agent. According to the method, the blocking agent is injected into the thick reservoir by means of the fracture to block strong water washing, long-distance and large-thickness thorough blocking is achieved, and excavation of remaining potential of medium weak washing and non-washing parts in the thick reservoir after polymerflooding is achieved through subsequent injection-production displacement.

Description

[0001] Technical field: [0002] The invention relates to the technical field of petroleum exploitation, in particular to a method for injecting a plugging agent into a thick oil layer by fracturing to plug a strong water washing strip. [0003] Background technique: [0004] At present, after the development of tertiary oil recovery in the main oil layers of some oilfields in China, rock particles gradually disperse and migrate, forming highly permeable and strong water-washed strips that are dozens or even hundreds of times larger than the original pore size, and the vertical heterogeneity of oil layers is further aggravated. Large, in the subsequent water flooding development process after tertiary oil recovery, a strong water wash strip is formed at the bottom, which is inefficient and ineffective circulation, resulting in the remaining oil remaining on the top of the positive rhythm thick oil layer or the low water wash part in the middle and upper part of the compound rhyt...

Claims

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Application Information

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IPC IPC(8): E21B33/138
CPCE21B33/138
Inventor 万军孙智王洪卫白文广汪玉梅莫爱国康少冬张国军杨光李扬成
Owner PETROCHINA CO LTD
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