Well-drilling micro overflow while-drilling monitoring method

An overflow and drilling technology, used in surveying, earthmoving, wellbore/well components, etc., can solve the problem of high cost, achieve the effect of low cost, avoid large errors and easy operation

Active Publication Date: 2019-02-15
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires more sophisticated equipment and higher cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A drilling micro-overflow monitoring method, comprising the following steps:

[0022] 1) In the drilling stage before the formation fluid enters the wellbore, the drilling fluid is circulated according to the drilling design drilling fluid displacement, and the pump stroke sensor monitors the total pump stroke number N of the drilling fluid pump in real time pum (i), and calculate the inlet flow Q according to the number of pump strokes and the diameter and stroke of the pump cylinder liner in (i), and filter and calculate the average flow Q inA ;

[0023] 2) During the drilling stage before the formation fluid enters the wellbore, measure the outlet flow Q in real time out (i), carry out filter processing to calculate the average flow rate Q outA , and check the inlet flow according to the outlet displacement, and calculate the check factor f, f=Q outA / Q inA ;

[0024] 3) When drilling new formations, real-time monitoring of the stroke number N of the inlet mast...

Embodiment 2

[0030] On the basis of Example 1, the inlet flow In the formula: D is the diameter of the cylinder liner, S is the stroke, n is the number of cylinders, α pump water supply coefficient, N pum is the number of pump strokes.

[0031] Circulate the drilling fluid according to the drilling fluid displacement according to the drilling design, and the pump stroke sensor monitors the pump stroke number of the drilling fluid pump in real time N pum (i), and calculate the inlet flow Q according to the number of pump strokes and the diameter and stroke of the pump cylinder liner in (i), so that the inlet flow can be calculated during drilling without delaying production.

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PUM

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Abstract

The invention relates to the field of oil and gas field well-drilling pressure control, in particular to a well-drilling micro overflow while-drilling monitoring method. The well-drilling micro overflow while-drilling monitoring method comprises the following steps that (1) at the drilling stage before formation fluid enters a wellbore, the inlet flow Q<in>(i) is calculated, filter processing is conducted, and the average flow Q<inA> is calculated; (2) the outlet flow Q<out>(i) is measured in real time, filter processing is conducted, the average flow Q<outA> is calculated, the inlet flow is checked according to the outlet displacement, and the check coefficient f is calculated, wherein f=Q<outA>/Q<inA>; (3) when a new formation is drilled, the real-time inlet displacement Q<in>(i) and thechecked inlet flow Q<inc>(i) are calculated, wherein Q<inc>(i)=Q<in>(i)*f; and (4) the cumulative flow difference (Q<out>(i)-Q<inc>(i))*delta t in one time period delta t is calculated, if (Q<out>(i)-Q<inc>(i))*delta t is greater than cL, (c is greater than or equal to 0.01 L and less than or equal to 2000 L, delta t is greater than or equal to 1 s), and when c is greater than or equal to 1 L under the general condition, micro overflow is judged. The well-drilling micro overflow while-drilling monitoring method is small in monitoring error, fast in monitoring and low in cost.

Description

technical field [0001] The invention relates to the field of drilling pressure control in oil and gas fields, in particular to a drilling micro-overflow monitoring method while drilling. Background technique [0002] In the process of oil and gas drilling engineering, accurately knowing whether the formation fluid enters the wellbore is related to the wellbore pressure control and well control safety issues. If the overflow is found later and the overflow volume is large, the shut-in casing pressure will be high, which is not conducive to post-processing. Severe cases can lead to major safety accidents. Therefore, timely detection of micro-overflow is beneficial to pressure control during drilling and ensures safe drilling operations. At present, the monitoring methods for formation fluid entering the wellbore during oil drilling are mainly: [0003] First, through manual monitoring of the liquid level, measure whether the total amount of the drilling fluid circulation tan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/10
CPCE21B47/10
Inventor 帅竣天李枝林范翔宇杨玻张千贵杨博仲强瑜马天寿郭昭学
Owner SOUTHWEST PETROLEUM UNIV
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