Method for developing low-permeability gas reservoir

A low-permeability, gas-reservoir technology, applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of increased development cost, large investment, and inability to add well slots, etc., to reduce development costs and improve Economic benefits and the effect of saving development investment

Inactive Publication Date: 2013-02-06
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology

[0004] 1) Drilling and development of new production platforms or underwater production systems. From the construction of new production platforms or underwater production systems to production, the cycle is long and the investment is large. It is difficult to achieve economical and effective low-permeability gas reservoirs in or around the developed offshore gas fields. At the same time, it will also cause the existing well pattern and existing production facilities of the developed gas field production platform or subsea production system to be unavailable
[0005] 2) The drilling and completion costs and engineering costs caused by the intensified well pattern greatly increase the development cost. In addition, the single-well production

Method used

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  • Method for developing low-permeability gas reservoir

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Embodiment Construction

[0029] as attached figure 2 As shown, a method for developing a low-permeability gas reservoir includes the following steps:

[0030] 1) In the middle and early stage of the development of the offshore developed gas field, the physical property of the reservoir sand body is selected from the gas field, and the physical property of the reservoir sand body is medium-high permeability, that is, the permeability is > 10mD, and the production gas reservoir 4 with a relatively stable distribution is selected, and the sand body of the production gas reservoir 4 is combined. The spatial distribution range and the drilling capacity of the drilling ship 9, select the undeveloped low-permeability gas reservoir 1 suitable for the development method of the present invention in or around the developed gas field;

[0031] 2) According to the spatial relationship between the selected low-permeability gas reservoir 1 to be developed and the production gas reservoir 4 of the developed gas fie...

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Abstract

The invention discloses a method for developing a low-permeability gas reservoir, which comprises the following steps: positioning a drilling ship on a sea for well drilling and well completion, establishing a synthetic natural gas migration channel between a production gas reservoir sand body of a developed gas field and a selected to-be-developed low-permeability gas reservoir and combining with a fracturing technology; utilizing the production gas reservoir sand body as a transporting layer and fully utilizing a production platform of the developed gas field or the existing well network of the production gas reservoir of an underwater production system to realize the development of the developed gas field on the sea or the low-permeability gas reservoir on the periphery of the developed gas field so as to reduce the well drilling quantity and the well completion period and reduce the well drilling and well completion expenses. The method has the benefits that well drilling and well completion operation procedures and a well completion tube string structure are simplified, the operation difficulty and the workload are reduced, and the cost is greatly reduced; and by adopting the method, a residual well slot or a residual underwater wellhead is not required, a well slot or a underwater wellhead is not required to be additionally arranged, and a production platform or a underwater production system is not required to be newly built, so that the development investment is greatly reduced, and the economic benefit is greatly improved.

Description

technical field [0001] The invention relates to a method for developing natural gas, in particular to a method for developing low-permeability gas reservoirs. Background technique [0002] The patent belongs to the field of oil and gas development. Low-permeability gas reservoirs refer to gas reservoirs with poor reservoir physical properties and difficult to effectively develop on a large scale by conventional mining methods. There are currently many versions of the basis and standards for the division of low-permeability gas reservoirs. The domestically recognized one is based on the permeability. According to the classification, the gas reservoirs with permeability less than 10mD are classified as low-permeability gas reservoirs, and at the same time, low-permeability gas reservoirs are further divided into general low-permeability gas reservoirs, low-permeability gas reservoirs and ultra-low-permeability gas reservoirs. At present, there are three main methods for t...

Claims

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Application Information

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IPC IPC(8): E21B43/01
Inventor 谢玉洪马勇新李明军杨志兴王雯娟姜平
Owner CHINA NAT OFFSHORE OIL CORP
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