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Intelligent well killing method and device for complex pressure system stratum

A formation and pressure technology, which is applied in earthwork drilling, wellbore flushing, wellbore/well components, etc., can solve the problems of relying on manual experience, low success rate, high risk, etc., and achieve no manual operation delay, timely monitoring, Engineering Reliable Effects

Active Publication Date: 2021-06-22
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the lack of intelligent well killing control methods and supporting equipment, more reliance on manual experience, the current well killing success rate is low and the risk is high

Method used

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  • Intelligent well killing method and device for complex pressure system stratum
  • Intelligent well killing method and device for complex pressure system stratum
  • Intelligent well killing method and device for complex pressure system stratum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0155] An intelligent well killing method for complex pressure system formations, comprising the following steps:

[0156] (1) Real-time monitoring of downhole-surface real-time information, including inlet / outlet drilling fluid flow difference, drilling fluid temperature, density, mud resistivity, standpipe pressure, mud pool increment, hook load;

[0157] (2) Process the real-time downhole-surface real-time information monitored in step (1) to judge downhole working conditions. If downhole abnormalities occur, real-time inversion of formation pressure and formation permeability, and real-time inversion of the wellbore multiphase flow model Uncertain parameters in the middle, dynamic simulation calculation of wellbore pressure distribution;

[0158] (3) Send out control signals, intelligently optimize and design throttling control parameters, including throttle valve connection mode and pressure drop distribution scheme, adjust wellhead pressure in real time to maintain const...

Embodiment 2

[0160] According to a kind of complex pressure system stratum intelligent killing method described in embodiment 1, its difference is:

[0161] In step (2), processing the downhole-surface real-time information monitored in step (1) in real time, and judging the downhole working condition means: combining the downhole real-time data for early overflow monitoring, the specific steps are as follows:

[0162] Collect overflow monitoring data X=[X from downhole PWD101 1 ,X 2 ,…X i ,…X m ],X i are different overflow detection parameters, which are discrete data sequences varying with time t, also denoted as x i (t), i=1,2,...,m, m is the length of the collected data, for a certain time interval t∈[n-L+1,n], L is the time window, and n is an arbitrarily selected time interval The starting point of , and its corresponding x(t) is approximated by the local linear regression model as formula (I):

[0163] x(t)=k(n)t+b(n) (I)

[0164] In the formula (I), k(n) is the slope of the ...

Embodiment 3

[0189] According to a kind of complex pressure system stratum intelligent killing method described in embodiment 1, its difference is:

[0190] In step (2), real-time inversion of formation pressure and formation permeability refers to:

[0191] After gas kick occurs during drilling, the reservoir fluid entering the wellbore will cause changes in the fluid composition and flow rate in the annular space. By measuring parameters such as pressure and flow rate, the reservoir parameters can be deduced in reverse. The gas invasion process is similar to the unstable well testing process, so certain formation information can be represented based on changes in gas invasion response parameters (vertical pressure, outlet flow, mud pool increment, etc.), so as to realize formation information inversion before well shut-in.

[0192]Since the gas invasion is slow and the expansion rate is very small in the early stage of gas invasion, the gas production rate at the bottom hole can be obtai...

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Abstract

The invention relates to an intelligent well killing method and device for a complex pressure system stratum. The method comprises the steps that (1) real-time information of the underground-ground is monitored in real time; (2) the real-time information of the underground-ground is processed, the underground working condition is judged, and if underground abnormity occurs, on one hand, uncertain parameters in a shaft multi-phase flow model are inverted in real time, and on the other hand, shaft pressure distribution is dynamically simulated and calculated; and (3) a control signal is sent out, throttling control parameters are intelligently optimized and designed, the throttling control parameters comprise the connecting mode of a throttling valve and a pressure drop distribution scheme, the wellhead pressure is adjusted in real time to maintain the constant bottom hole pressure, meanwhile, casing pressure vertical pressure feedback is tracked, and a well killing regulation and control scheme is intelligently optimized and adjusted through a feedback knot. According to the method, the underground working condition can be automatically monitored in real time in the whole process, the stratum pressure information is intelligently inverted according to the change trend of the measurement information, and the purposes of accurate and timely monitoring of the underground abnormity and intelligent recognition of the complex pressure system stratum information are achieved.

Description

technical field [0001] The invention relates to an intelligent well killing method and device for formations with complex pressure systems, belonging to the field of petroleum exploration and development. Background technique [0002] With the continuous expansion of the country's demand for oil and gas resources, complex geological structures and scattered oilfield blocks have become hot spots in oil and gas exploration and development. Uncertainty in information and other problems lead to frequent occurrence of abnormally high pressure well sections, narrow drilling fluid safety density window, and gas kick accidents are very prone to occur. It overcomes difficulties such as low success rate and high risk of killing wells at one time. [0003] The law of multiphase flow in the wellbore after gas invasion and shut-in is complicated. The traditional method is to judge the pressure point based on the casing pressure change curve of the shut-in wellhead, and then calculate th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/00E21B21/08E21B47/06E21B47/07E21B49/00
CPCE21B47/00E21B21/08E21B47/06E21B49/00
Inventor 王志远仉志孙宝江夏安迪孙小辉
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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