Real-time monitoring method and device of underbalanced drilling well bottom pressure
A technology of underbalanced drilling and bottom hole pressure, which is applied in the direction of wellbore/well components, earthwork drilling and production, flushing wellbore, etc. Effects of error and hysteresis
Inactive Publication Date: 2013-09-18
WESTERN DRILLING KELAMAYI DRILLING TECH INST
View PDF4 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
These methods can control the underpressure value to a certain extent, but due to the influence of multiphase flow pattern diversity, the theoretical calculation is inaccurate, and small changes in some parameters often cause the underbalanced drilling state to disappear, resulting in the actual Did not reach the underbalanced state, thus affecting the quality and safety of underbalanced drilling operations
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0018] specific implementation plan
[0019] Further description will be made below in conjunction with the accompanying drawings.
[0020] The bottomhole pressure real-time monitoring device for underbalanced drilling is attached figure 1 Shown in is composed of bottom hole data acquisition device 1, surface data acquisition unit 5, bottom hole pressure control unit 9, execution unit 7 and CAN_BUS bus unit 4; the bottom hole data acquisition unit consists of a sensor module installed at the bottom of the drill string, A / D module, pulse controller, battery cartridge and pulse generator, the sensor module receives bottom-hole dynamic data, the sensor module collects bottom-hole pressure, temperature and other data, converted into digital signals by A / D module, and sent to the pulse controller The code is uploaded to the ground by the pulse generator in the form of a pulse signal, and the battery cylinder provides electric energy for the bottom hole data acquisition unit; t...
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
Login to View More Abstract
The invention relates to real-time monitoring method and device of underbalanced drilling well bottom pressure, wherein an implementation method comprises the steps of well bottom pressure data acquisition and transmission, ground data acquisition, on-site data processing and well bottom pressure control; the device comprises a well bottom pressure acquisition unit, a ground data acquisition unit, an on-site data processing unit, a well bottom pressure control unit, an execution unit and a CAN_BUS (Controller Area Network) unit which are installed between a drill collar and a uniflow valve at the bottom of a drilling string; a bias is obtained through comparing a well bottom measured pressure value with a predesigned pressure value, and if the bias exceeds a range, the switching degree of a hydraulically operated throttle valve is regulated to realize the monitoring for the well bottom pressure; and well bottom real-time acquired well bottom pressure data is adopted by the invention and is transmitted to the ground to control ground equipment in real time, thereby effectively avoiding the influence on the control precision of an under-pressure value caused by the error and the lag of model computation and well bottom actual pressure data.
Description
technical field [0001] The invention relates to an oil and gas field drilling operation tool, in particular to a real-time monitoring device and method for underbalanced drilling bottom hole pressure. Background technique [0002] In recent years, with the increase of oil and gas reservoir exploration and development workload in low-pressure, low-permeability formations, deep formations and complex areas, due to large investment and long drilling cycle, how to increase oil and gas production and recover drilling costs as soon as possible is the key to the economic exploration of the above-mentioned complex oilfields. The key issues to be considered in development, and the technical advantages of underbalanced drilling, which is beneficial to reservoir protection and can increase drilling speed, have gradually attracted the attention of decision makers in major oilfield companies at home and abroad, benefiting from the above-mentioned market demand and underbalanced drilling. ...
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
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): E21B21/08
Inventor 周强陈若铭宋朝晖罗维唐亮宁世品
Owner WESTERN DRILLING KELAMAYI DRILLING TECH INST