A Method for Developing Heterogeneous Gas Hydrate Reservoirs by Staged Perforation of Horizontal Wells
A hydrate and natural gas technology, applied in the field of natural gas hydrate reservoir exploitation, can solve the problems of channeling, affecting the natural gas hydrate exploitation efficiency, etc.
Active Publication Date: 2020-07-07
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology
In the exploitation of natural gas hydrate, horizontal wells can effectively increase the contact area and expand the decomposition range of natural gas hydrate, thereby increasing the gas production rate. However, due to the heterogeneity of natural gas hydrate reservoirs, it is easy Channeling occurs, seriously affecting the production efficiency of natural gas hydrate
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[0016] The present invention will be described in detail below in conjunction with the accompanying drawings, but the implementation scope of the present invention is not limited.
[0017] (1) According to the geological data of natural gas hydrate reservoirs, a natural gas hydrate reservoir 4 with an average effective thickness of 25 m is selected, and a vertical well 2 is drilled. From the bottom of the natural gas hydrate reservoir 4 to 2 / 3 of the depth of the natural gas hydrate reservoir 4;
[0018] (2) drill a horizontal well 1 on one side of the straight well 2, the heel of the horizontal well 1 is the far end of the straight well and the toe end of the horizontal well is the near end of the straight well, in order to avoid the The hot water injected from the vertical well 2 is channeled to the horizontal well 1, the horizontal distance between the vertical well 2 and the toe of the horizontal well 1 is 40m, and the depth of the horizontal section of the horizontal well...
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The invention discloses a method for developing a heterogeneous gas hydrate reservoir by a segmented perforation horizontal well. The method mainly comprises a heat injection vertical well and a production horizontal well, the production horizontal well is opened in a segmented mode and combined with the thermal exploitation of natural gas hydrate, hot fluid injected into the vertical well is forced to heat the different positions of the natural gas hydrate reservoir so as to improve the recovery rate of the natural gas hydrate reservoir. The specific method comprises the steps that the vertical well is used for injecting the hot fluid into the gas hydrate reservoir to promote the decomposition of hydrates, the horizontal section of the horizontal well is first fully opened and maintains depressurized development, when the gas production rate is reduced to a certain extent, the number of segments is divided according to the permeability of the natural hydrate reservoir, the horizontalsegments are subjected to segmented development from the toe end to the heel segment, and the thermal exploitation of the heterogeneous gas hydrate reservoir is realized. The method fully uses a horizontal well structure, reduces the production cost, and provides effective measures for the efficient development of the heterogeneous gas hydrate reservoir.
Description
technical field [0001] The invention relates to a method for exploiting natural gas hydrate reservoirs, in particular to a method for developing heterogeneous natural gas hydrate reservoirs by staged perforation of horizontal wells. Background technique [0002] As an unconventional natural gas resource, natural gas hydrate has been widely valued and studied all over the world due to its advantages of wide distribution, various types, large reserves and high energy density. In the current situation where the development and utilization of traditional fossil energy resources are more difficult, natural gas hydrate is recognized as one of the most promising new and efficient clean energy sources, and has huge potential for exploitation. [0003] In a high-pressure and low-temperature environment, natural gas and water will form natural gas hydrate, and when the conditions for the existence of natural gas are broken, that is, when the temperature is raised at a given pressure, ...
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IPC IPC(8): E21B43/01E21B43/24
CPCE21B41/0099E21B43/01E21B43/24
Inventor 侯健刘永革周康杜庆军白雅洁纪云开陆努王文斌
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)