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A detection method for wellbore circulation pressure loss in formation drilling with narrow safe density window

A technology of cycle pressure loss and detection method, which is applied in wellbore/well components, measurement, earthwork drilling and production, etc. It can solve the problems of inability to measure while drilling and pressure control in the detection process, so as to avoid a large amount of leakage and formation pressure effect of cracking and improving accuracy

Active Publication Date: 2022-04-22
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention overcomes the deficiencies of the prior art, provides a method for detecting the circulating pressure loss of the drilling wellbore in the narrow safe density window formation under the accurate pressure control state, and solves the problem that the existing detection process of the drilling wellbore circulating pressure loss in the narrow safe density window formation cannot Problems with pressure control or inability to measure while drilling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for detecting circulating pressure loss of wellbore drilling in a narrow safe density window formation, comprising the following steps:

[0027] 1) Stop the pump, quickly close several throttle valves to increase the casing pressure value Pc, and stop closing the throttle valves when the casing pressure value reaches the design casing pressure value Pcmax, where the design casing pressure value design casing pressure value Pcmax=P fm +P CD +△P,P fm is the estimated circulation loss value during drilling fluid circulation, P CD Casing pressure value during normal drilling; △P is the estimated circulation loss value error and an additional value for safety when considering drilling fluid circulation, 0.1≤△P≤7Mpa;

[0028] At this time, the bottom hole pressure BHP=P H +P C , and BHP>P L , then Pcmax+P H >P L , the wellbore fluid leaks into the formation, and the casing pressure Pc gradually decreases. When the bottom hole pressure BHP=the formation leakage...

Embodiment 2

[0035] On the basis of Embodiment 1, in step 1), according to the adjacent well data, the error compensation value ΔP is increased or decreased for the estimated circulation loss during drilling fluid circulation.

[0036] Correct the estimated circulation loss during drilling fluid circulation, improve the accuracy of the estimated circulation loss value, and correspondingly improve the accuracy of the design casing pressure value Pcmax, so as to facilitate accurate control of the casing pressure value and avoid a large amount of drilling fluid leakage or In the event of a safety hazard.

Embodiment 3

[0038] On the basis of Embodiment 1 or Embodiment 2, the design casing pressure value Pcmax<10.05Mpa.

[0039] The design casing pressure value Pcmax<10.05Mpa ensures safety and avoids formation fracturing, massive drilling fluid loss, and potential safety hazards.

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PUM

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Abstract

The invention relates to the field of drilling pressure control in oil and gas fields, in particular to a method for detecting circulation pressure loss of a wellbore in a formation with a narrow safe density window. The technical solution is: a method for testing the circulating pressure loss of a wellbore in a formation with a narrow safe density window, including the following steps: 1) stop the pump, and quickly close a number of throttle valves to increase the casing pressure value Pc, so that the casing pressure value reaches the design casing pressure Stop closing the throttle valve when the value is Pcmax, where the design casing pressure value design casing pressure value Pcmax=P fm +P CD +△P,P fm is the estimated circulation loss value during drilling fluid circulation, P CD is the casing pressure value during normal drilling; △P is the estimated circulation loss value error and an additional value for safety when considering the drilling fluid circulation, 0.1≤△P≤7Mpa; 2) Observe the casing pressure value change, when the casing pressure value Gradually tends to be stable, take the stable casing pressure value P CL ; 3) Calculating the drilling wellbore circulation pressure loss P f =P CL -P CD . The invention provides a method for detecting the circulating pressure loss of wellbore drilling in a formation with a narrow safe density window under an accurate pressure control state.

Description

technical field [0001] The invention relates to the field of drilling pressure control in oil and gas fields, in particular to a method for detecting circulation pressure loss of a wellbore in a formation with a narrow safe density window. Background technique [0002] In recent years, with the intensification of oil and gas exploration and development, the number of wells drilled in various complex areas is increasing. The application of conventional overbalance pressure control technology can no longer meet the requirements of safe drilling and production in narrow density window formations. Circulating pressure loss is related to wellbore pressure control and process implementation during drilling, connecting single (pillar), and tripping. If the drilling wellbore circulating pressure loss is not accurately grasped, it may cause complex accidents such as lost circulation or blowout; therefore, accurate Knowing the wellbore circulation pressure loss in formation drilling i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/06
CPCE21B47/06
Inventor 范翔宇李枝林帅竣天张千贵杨博仲刘金华刘洪刚马天寿张杰
Owner SOUTHWEST PETROLEUM UNIV