Unlock instant, AI-driven research and patent intelligence for your innovation.

Deep well low-density cement slurry

A low-density, cement slurry technology, used in the field of cement slurry, can solve the problems of low water loss, poor compressive strength and settlement stability, and low permeability, and achieve the effect of reducing water loss.

Inactive Publication Date: 2007-10-17
DAQING PETROLEUM ADMINISTRATION +1
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiencies of existing low-density cement slurry with poor compressive strength and poor settlement stability, the present invention provides a deep well low-density cement slurry. The physical and chemical effects of external admixtures improve the settlement stability of low-density cement slurry and the compressive strength of cement stone, and have the characteristics of low water loss and low permeability

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0018] Embodiment: On the basis of indoor tests and ground simulation experiments, the project was tested on the SN-180 field in the Songnan area of ​​the Northeast Petroleum Bureau of Petrochemical Xinxing Company. The well is located in Shuanglong Township, Changling County, Jilin Province. The geological structure is located in the Shuanglong West Structure of Changling Sag. The geological reserves are mainly natural gas. The formation pressure in this area is low, which is easy to cause cement slurry leakage, especially in the Yaojia Formation and Qingshankou Formation. Easy to leak, the Denglouku and Huoshiling formations are easy to leak and blow out, and it is easy to induce annular air channeling and even blowout, which has a direct impact on oil and gas exploration and development in this area. Therefore, low-density cement slurry is generally used in this area for cementing. When SN-180 was completed, the well depth was 2,760 meters, the sealing height was 2,160 meter...

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
diameteraaaaaaaaaa
densityaaaaaaaaaa
densityaaaaaaaaaa
Login to View More

Abstract

The invention relates to low-density cement mortar for deep wells, wherein the constituents include (by weight ratio): cement 100 parts, water 87-126 parts, bulking agent 5-10 parts, lightening admixture 45-70 parts, quartz sand 5-25 parts and filtration-reducing agent 8-10 parts, the bulking agent is silica flour, the lightening admixture is bleaching beads, the filtration-reducing agent is prepared from sodium acrylic sulphonate, N-N-vinyl-2-pyrrolidone and AMPS through polymerization using SO2 as the oxidizing agent.

Description

Technical field: [0001] The invention relates to a cement slurry used in the technical field of oil field drilling and cementing, and belongs to a deep well low-density cement slurry. Background technique: [0002] With the continuous deepening of exploration in the periphery of Daqing, oil and gas layers are distributed from shallow to deep layers. The oil and gas layers are widely distributed. After drilling, the cementing section is long, that is, more and more wells are sealed. There are two methods for long-sealing well cementing. One method is to use two-stage injection tools, but it is difficult to find a suitable lowering position, resulting in unnecessary layers and waste of resources, prolonging the cementing period and complicating the construction process; the other The first method is to use low-density cement slurry to cement the well. This method can effectively reduce the hydrostatic column pressure and prevent formation leakage. Therefore, cement slurry with...

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
Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/46
Inventor 金永男杨智光贾维军高莉莉和传健徐永辉师忠南
Owner DAQING PETROLEUM ADMINISTRATION