Pressure monitoring system based on coal-bed methane inflation underbalance

Abstract

The invention relates to a pressure monitoring system based on coal-bed methane inflation underbalance. The pressure monitoring system based on coal-bed methane inflation underbalance comprises a data acquisition box, an upper computer and a touch type liquid crystal display platform, wherein the upper computer is respectively connected with the data acquisition box and the touch type liquid crystal display platform, and the data acquisition box is respectively connected with a pump stroke sensor, a flow sensor, a standpipe pressure sensor, a casing pressure sensor and a temperature sensor. By means of a hardware system matched with the sensors and an acquisition system, the pressure monitoring system achieves real-time monitoring and analytical calculation in a coal-bed methane inflation underbalance drilling process, and real-time monitoring and analytical calculation of on-site drilling conditions are achieved through a bundled software system. As for collapse, drill jamming, poor rock-carrying performance and other risks of coal-bed methane, the pressure monitoring system achieves timely prediction of the real-time drilling conditions of coal-bed methane inflation underbalance drilling, achieves real-time judgment of the risks, and guarantees safety of coal-bed methane drilling. The pressure monitoring system fills in gaps in pressure monitoring and control in the field of coal-bed methane drilling, greatly improves working efficiency of drilling, and lowers drilling cost.

Description

Technical field [0001] The invention relates to a drilling ground monitoring device, in particular to a pressure monitoring system based on underbalanced coal bed gas inflation. Background technique [0002] As a new type of clean energy, the development and utilization of coal-bed methane can, on the one hand, make up for the lack of conventional oil and gas resources to a certain extent, on the other hand, it can also effectively reduce the degree of coal mine gas disasters. It has broad application prospects in our country but the world. CBM is stored in coal seams. Because coal seams are different from conventional oil and gas reservoirs, they have the characteristics of shallow reservoir burial, easy collapse, pollution, and strong pressure sensitivity. Aerated underbalanced drilling technology is commonly used when drilling. The pressure monitoring has become the key technology of this process. [0003] Currently, CBM underbalanced drilling is mostly the pressure monitoring...

AI Technical Summary

Problems solved by technology

[0004] 1. Due to the characteristics of coalbed methane that are easy to collapse and pollute, only underbalanced technology can be used. For the gas-inflated underbalanced process technology adopted for coalbed methane, the conventional pressure monitoring and control system is too cumbersome and does not meet the low requirements of coalbed methane development. cost requirements

[0005] 2. Due to the complexity of the gas-filled underbalanced process, the conventional pressure monitoring and control system is often unable to effectively monitor and control the special area due to the particularity of the process during the drilling process

[0006] 3. For the potential safety hazards in the gas underbalance of coalbed methane, it is usually judged by the drilling personnel's own experience

This largely depends on the working time and drilling experience of the personnel engaged in coalbed methane drilling, which has great dependence and the efficiency of risk judgment is low

At the same time, the safety issue of underbalanced pressure control of CBM aeration has always been a recognized problem in the industry, and the conventional monitoring system cannot timely predict and judge the risks in the drilling process

[0007] The early domestic pressure monitoring hardware and supporting monitoring software are only suitable for the bottom hole pressure monitoring of conventional oil and gas wells, but for unconventional natural gas exploitation, especially coalbed methane exploitation, the conventional oil and gas well pressure monitoring system currently used in China has the above-mentioned problems. Limitations, unable to fully meet the needs of coalbed methane drilling site pressure monitoring

After investigation, it is found that there is no complete set of pressure monitoring and control system specially used for CBM aerated underbalanced drilling at home and abroad

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