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A kind of drilling method and used cementing device, well structure and application thereof

A well structure and drilling technology, which is applied to drilling equipment and methods, drilling equipment, wellbore/well components, etc., can solve problems such as economic loss, invisibility, and undeveloped limestone karst, and achieve economic benefits. The effect of increasing the utilization rate and improving the well completion rate

Active Publication Date: 2019-03-01
SHANDONG GEOLOGICAL ENG INVESTIGATION INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Under the above geological conditions, because the Ordovician is deeply buried, it is easy to cause the limestone karst to not develop, or due to the impact of the structure, the Ordovician limestone formation cannot be seen when drilling the strata. There is no geothermal water or the amount of geothermal water is very small. Since the Neogene and Paleogene strata above the Ordovician limestone strata in this drilling structure need to be cemented, the porous geothermal water with a large amount of water after cementing cannot be obtained. Utilization will make geothermal wells scrapped and cause great economic losses

Method used

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  • A kind of drilling method and used cementing device, well structure and application thereof
  • A kind of drilling method and used cementing device, well structure and application thereof

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Effect test

Embodiment 1

[0028] as attached figure 1 , 2 As shown, for the drilling structure of geothermal wells in uncertain thermal reservoirs in oil and gas geological areas, the well structure consists of the first-level caliber 1, the second-level caliber 3, the third-level caliber 5, the fourth-level caliber 7, the fifth-level caliber 9, First-level casing 2, API second-level casing 4, third-level casing 6, fourth-level casing 8, filter pipe 15, pipe joint 11, hanger 12, hanger seat 13, expansion rubber 14 , Cementing cement 10 components, first-level diameter / first-level casing, second-level caliber / API second-level casing, third-level caliber / API third-level casing, fourth-level caliber / API fourth-level casing The first-level casing and the fifth-level caliber constitute the drilling structure. The first-level casing, the API second-level casing, and the API third-level casing are used for cementing. The pipe joint 11 is connected to the API third-level casing 6 and installed. The hanger se...

Embodiment 2

[0034] In actual production, the geothermal well drilling structure of uncertain thermal reservoirs was adopted in Dongying and Weifang areas, and one geothermal well was successfully constructed in each construction. The pipe and filter pipe are installed with hangers and the upper and lower ends are made of expanded rubber to form a well, with a water volume of 40m3 / h, the water temperature is 53°C. The Dongying geothermal well is geothermal water in the karst heat storage section, and the geothermal water in the closed pore section uses API pipes to install hangers and expand the upper and lower ends of the well to form a well, with a water volume of 70m 3 / h, the water temperature is 73°C.

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Abstract

The invention belongs to the fields of geothermal exploration and mining, and particularly relates to a drilling structure, method and device used when the located stratum of a target reservoir is not determined. When a thermal reservoir of a first stratum is drilled, and target collecting objects exist, well cementation is not performed; the drilling is continuously performed to reach the inside of a thermal reservoir of a deeper stratum; when the target collecting objects exist in the second stratum, the well cementation is performed at the first stratum section, and well formation is performed in the second stratum; and when no target collecting object exists in the second stratum, well formation is performed at the first stratum. By the method, the well completion rate can be improved; the utilization rate is improved; and the economic benefits are increased.

Description

technical field [0001] The invention belongs to the field of geothermal geological exploration and exploitation, and in particular relates to a drilling structure, method and device when the formation where the target reservoir is located is uncertain. Background technique [0002] In geothermal geological work, drilling (drilling) refers to the use of mechanical equipment to drill underground cylindrical holes with a small diameter and a large depth. Drilling is generally divided into geological survey or exploration drilling, hydrogeological drilling, water well or engineering geological drilling, geothermal drilling, oil drilling, coal field drilling, ore field drilling, etc. by type. During the drilling process, the formation where the target storage is located is called a reservoir, and the reservoir is also called a reservoir, which refers to a rock formation with connected pores that allows the storage and infiltration of the target collection. For example, most of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B7/00E21B43/10E21B33/13
CPCE21B7/00E21B33/13E21B43/108
Inventor 李常锁赵光贞赵振华王少娟秦品瑞徐士民刘玉仙赵济同赵成聂玉鹏
Owner SHANDONG GEOLOGICAL ENG INVESTIGATION INST