Seam cutting method for interlayer of SAGD thick oil dual horizontal well
A technology of double horizontal wells and interlayers, which is applied to drilling equipment, earthwork drilling, drilling measurement, etc., can solve the problems of low oil displacement efficiency and achieve the effect of improving oil displacement efficiency
Pending Publication Date: 2020-03-24
泰尔达能源科技(北京)有限公司
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Problems solved by technology
[0003] In the process of realizing the present invention, the inventor found that there are at least the following problems in the prior art: the treatment method for the interlayer, the connection between the upper and lower oil layers is point contact, and the oil displacement efficiency is low
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[0022] The following clearly and completely describes the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0023] The embodiment of the present invention provides a SAGD heavy oil double-horizontal well interlayer cutting method, and the SAGD heavy oil double-horizontal well separation interlayer cutting method includes:
[0024] Excavation of horizontal wells for gas injection wells;
[0025] After the horizontal well of the gas injection well is excavated for 20m, that is, after the horizontal well of the gas injection well lands, a branch 4 for detecting the interlayer is drilled upwards, and the branch 4 for detecting the interlayer ...
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The embodiment of the invention provides a seam cutting method for an interlayer of an SAGD thick oil dual horizontal well. The seam cutting method for an interlayer of an SAGD thick oil dual horizontal well comprises the steps of performing digging of a horizontal well; after the horizontal well is dug for 20m, drilling a branch for detecting the interlayer in an inclined upward direction; identifying the interlayer through the identification criterion; identifying whether a stratum is the interlayer or not and the thickness of the interlayer; and for the stratum which is the interlayer and the thickness of the interlayer is smaller than 30cm, seeking a side drill point on a borehole, below the interlayer, of the branch for detecting the interlayer, drilling a secondary branch from the side drill point, expanding and distributing the secondary branch directly over a gas injection borehole, and drilling the interlayer to be smashed through a bit along the direction of a production well.
Description
technical field [0001] The invention relates to the field of petroleum exploitation, in particular to a SAGD heavy oil double-horizontal well interlayer cutting method. Background technique [0002] my country and other parts of the world are rich in heavy oil resources, and the current SAGD (gravity-assisted steam drainage) dual-horizontal well development technology has become the mainstream technology. Since the heavy oil reservoirs are mostly continental formations with frequent phase changes in the plane and vertical direction, there are many interlayers inside the reservoir, which split and block the reservoir. The existence of interlayers creates a major obstacle to the further fine development of heavy oil. [0003] In the process of realizing the present invention, the inventors found that there are at least the following problems in the prior art: the treatment method for the interlayer interlayer, the connection between the upper and lower oil layers is point cont...
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IPC IPC(8): E21B43/16E21B43/17E21B47/00E21B45/00
CPCE21B43/16E21B43/17E21B47/00E21B45/00
Inventor 胡鹏孙新革
Owner 泰尔达能源科技(北京)有限公司