Method for treating wellhead of waste oil well in soft mud layer

A treatment method and oil well technology, which is applied in wellbore/well components, drilling equipment, earthwork drilling and production, etc., and can solve problems such as position deviation and water accumulation

Active Publication Date: 2021-05-18
国家能源集团宁夏煤业有限责任公司双马一矿 +2
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These oil wells in the Shuangma Minefield have a major impact on the safe and efficient mining of the mine. However, during the process of plugging the abandoned oil wells, it was found that the wellhead of the abandoned oil wells of Ma Qian 22 was damaged by local villagers, and the position of the abandoned oil wells of Ma Qian 22 was displaced. The wellhead of the abandoned oil well is located in the low-lying place of the wellhead of the wind shaft of Shuangma Coal Mine, where the Quaternary loess layer is thicker, and the low-lying place has accumulated water for a long time. The location of the wellhead of the well is limited by environmental conditions, and large-scale mechanical equipment cannot meet the construction requirements. At the same time, in order to safely block the abandoned oil well, special treatment is required for the wellhead; therefore, it is necessary to provide a reasonable treatment method and a safe and reliable treatment environment. It is very necessary to treat the wellhead of abandoned oil wells in the soft mud layer where the soft mud near the wellhead of the abandoned oil well is prevented.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for treating wellhead of waste oil well in soft mud layer
  • Method for treating wellhead of waste oil well in soft mud layer
  • Method for treating wellhead of waste oil well in soft mud layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Such as figure 1 As shown, a method for treating the wellhead of an abandoned oil well in the soft mud layer, step 1), using large-scale equipment forklifts, excavators, and dump trucks to excavate and transport the soil layer near the surface wellhead until the large-scale equipment in the soft mud layer Stop working when unable to work;

[0029] Such as figure 2 As shown, step 2), manually process or customize the φ1200mm*L3000mm*D8mm pipeline, use the crane to transfer the φ1200mm*L3000mm*D8mm pipeline outside the wellhead of the abandoned oil well, and align the center of the φ1200mm*L3000mm*D8mm pipeline with the center of the abandoned oil well wellhead into the ooze layer;

[0030] Step 3), use a forklift to press the pipeline into the soft mud layer, and then manually process the sludge in the pipeline. During the cleaning process, the pipeline will settle downward. When the difference between the upper edge of the pipeline and the sludge outside the pipeline...

Embodiment 2

[0034] 1. If Figure 1-5 As shown, a method for treating the wellhead of an abandoned oil well in a soft mud layer is characterized in that it comprises the following steps:

[0035] Step 1), use large-scale equipment forklifts, excavators, and dump trucks to excavate and transport the soil layer near the surface wellhead until the large-scale equipment in the soft mud layer cannot operate.

[0036] Step 2), manually process or customize the φ1200mm*L3000mm*D8mm pipeline, use the crane to transfer the φ1200mm*L3000mm*D8mm pipeline outside the wellhead of the abandoned oil well, and place the center of the φ1200mm*L3000mm*D8mm pipeline coincident with the center of the abandoned oil well wellhead into the soft in the mud layer.

[0037] Step 3), use a forklift to press the pipeline into the soft mud layer, and then manually process the sludge in the pipeline. During the cleaning process, the pipeline will sink downward. When the difference between the upper edge of the pipelin...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Lengthaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for treating a wellhead of a waste oil well in a soft mud layer. The method comprises the steps that 1), mechanical equipment such as a large forklift, an excavator and a dumper is utilized for treating a soil layer near the wellhead of the ground surface; 2), a crane is utilized for transferring a pipeline into the exterior of the wellhead of the waste oil well; 3), the forklift is utilized for pressing the pipeline into the soft mud layer, then sludge in the pipeline is manually treated, and when the difference between the upper edge of the pipeline and the sludge outside the pipeline is 500mm, pipeline butt joint is conducted; 4), a casing pipe is put into the waste oil well to be in butt joint with the original waste oil well, and cement is poured into a gap between the interior of the pipeline and the casing pipe; and 5), the length of the required external casing pipe is determined according to the distance between the ground and the upper edge of the casing pipe, then the external casing pipe is in butt joint with the fixed casing pipe through the crane, and after butt joint is completed, the periphery of the casing pipe is subjected to landfill and compaction. The method has the advantages that the treatment method is reasonable, the treatment environment is safe and reliable, and soft mud near the wellhead of the waste oil well is prevented from gathering towards the wellhead.

Description

technical field [0001] The invention relates to the technical field of oil well treatment, in particular to a method for treating the wellhead of an abandoned oil well in a soft mud layer. Background technique [0002] The treatment of the wellhead of the abandoned oil well is based on the available value of the abandoned oil well or the abandoned oil well is not sealed after the oil production is completed, which has a certain impact on the mining method in the overlapping area as surface mining resources, while the oil well mining belongs to the land area. Line mining in the vertical direction. In order to restore the original abandoned oil wells to achieve the purpose of re-exploiting oil or reduce the impact of abandoned oil wells on surface mining resources, etc. At the same time, due to the long history of construction of the abandoned oil well, the original construction surface has undergone major changes, resulting in the wellhead of the abandoned oil well being in ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): E21B41/00E21B17/00
CPCE21B41/00E21B17/00
Inventor马兴华肖江马智孙亚超张刚梁顺张昭盛林
Owner国家能源集团宁夏煤业有限责任公司双马一矿