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A method for layered development of sandstone geothermal wells

A technology for geothermal wells and sand fields, which is applied in the direction of mining fluids, earthwork drilling, wellbore/well components, etc. It can solve the problems of low diagenesis, improve the energy efficiency of production and irrigation, improve development capabilities, and improve thermal energy indicators.

Active Publication Date: 2021-09-07
中石化绿源地热能(陕西)开发有限公司
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Problems solved by technology

Although this problem has been improved in the Neogene strata, its diagenetic degree is still low and cannot be compared with the strata below the Mesozoic

Method used

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  • A method for layered development of sandstone geothermal wells
  • A method for layered development of sandstone geothermal wells
  • A method for layered development of sandstone geothermal wells

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Embodiment

[0072] In the present invention Lam - gaoling BAHE and an Example of the present invention will be described in detail.

[0073] Ratio of sand differ by geothermal wells statistics obtained Lam - BAHE average sand than 32.82%, the average ratio of sand to 25.46% gaoling group (see Figure 7 ). As can be seen from the figure, and the group Zhangjiapo gaoling group sand than less than 30%, indicating that they are isolated sand bodies sandbody; Lam - sand BAHE density of between 30 to 50%, indicating Lam - Ba River sand group for local communication profile strip sand. Comparison of these two heat reservoirs, Lam - heat reservoir heterogeneity BAHE relatively small, gaoling group followed Zhangjiapo largest group.

[0074] The first is the use of the original two open wellbore cementing sealing structure drilling two rear section to the rear open wells drilled 3500m 177.8mm intermediate casing completion, the system is then in a newly Lam - 152.4mm apart BAHE the interval at 2500m bi...

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Abstract

The invention provides a method for layered development of sandstone geothermal wells, comprising the following steps ①: Obtain the statistical results of sand-land ratios in at least two adjacent geothermal well group development areas, and obtain the average sand-land ratio in this area; ②: According to the average sand-land ratio Ratio, determine sand body properties, and determine the heterogeneity comparison results of thermal reservoirs in different geothermal well group development areas; ③: at least two adjacent geothermal well group development areas with the smallest heterogeneity comparison results are the development areas, Vertical well group or directional well group development are respectively carried out. The main purpose of the present invention is to improve the utilization efficiency of hydrothermal geothermal resources, improve the development ability, increase the flow area of ​​the main heat reservoir and heat energy supplement, and then improve the heat energy index, improve the energy efficiency of harvesting and irrigation, and make the development from the rough and crazy Development gradually turned into scientific.

Description

Technical field [0001] The present invention relates to a technology developed sandstone geothermal wells, in particular a layered sandstone geothermal well developed methods. Background technique [0002] Central Guanzhong Basin, including Baoji raised east, Xi'an depression, temporary blue raised in the northwest, solid sunken city, salty ceremony raised in the south and raised in southern Pucheng (due Baoji raised and raised in the Pucheng information geothermal wells and not less full, and thus not be analyzed). Cenozoic deposition thickness generally larger, especially in the recess area, generally 3000-5000m, 7000m thickness up above, multi-phase or lacustrine deposition of rivers, predominantly sandstone lithology, and Glutenite mudstone, porosity fissures, provides a good storage space geothermal fluid. Buried controlled by basement structures, different parts of a large difference in hot aqueous formations, ridges or recesses in the edge of the substrate buried shallow r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/14E21B49/00
Inventor 王鹏涛郭世炎蒙蒙张献喻任晓庆赵宇璇陈升强郑婷王仁梅
Owner 中石化绿源地热能(陕西)开发有限公司
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