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Quantitative evaluation method for borehole cleanliness based on rock debris return condition

A quantitative evaluation and cuttings technology, applied in wellbore/well components, measurement, earthwork drilling and mining, etc., can solve the problem of low cuttings weighing measurement accuracy, no cuttings volume calibration method, and no calculation results and other problems to achieve the effect of reducing operation risk, improving accuracy and convenient operation

Pending Publication Date: 2022-02-08
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the change of the vibrating screen cloth and working conditions on site, the moisture content is a changing value, so the calculation using this parameter will not get accurate calculation results
In addition, the cuttings weighing device under the vibrating screen is easily affected by the inspection personnel of the circulating tank, and it is a discontinuous measurement device, so the measurement accuracy of cuttings weighing is not high
[0005] Another example is the patent literature with the publication number CN112446560A disclosing a comprehensive monitoring and evaluation system for borehole cleaning of shale gas horizontal wells. Provides a calibration method for the amount of cuttings, so its analysis results are not accurate

Method used

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  • Quantitative evaluation method for borehole cleanliness based on rock debris return condition
  • Quantitative evaluation method for borehole cleanliness based on rock debris return condition
  • Quantitative evaluation method for borehole cleanliness based on rock debris return condition

Examples

Experimental program
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Effect test

Embodiment 1

[0085] This embodiment discloses a quantitative evaluation method for wellbore cleaning based on cuttings return. The method judges the bottom cuttings by comparing the amount of cuttings returned from the ground during drilling with the theoretical amount of cuttings generated at the bottom of the well. In order to provide a basis for the identification of the shape of the cuttings bed, it can guide the optimization of ground parameters and reduce the operation risk. Such as figure 1 As shown, the method includes the following steps:

[0086] Step 1: Calculate the theoretical cuttings volume that can be returned to the surface downhole according to relevant data such as borehole diameter and borehole depth change.

[0087] The calculation method of theoretical cuttings volume described in this step is:

[0088] V 理论=pi*R 2 / 4*ΔH (1)

[0089] In formula (1), V 理论 is the theoretical cuttings volume, pi is the circumference ratio, R is the theoretical borehole diameter obt...

Embodiment 2

[0104] On the basis of Embodiment 1, this embodiment further limits the method for obtaining the amount of rock debris that has been returned. The acquisition method is based on the double receiving container 1 weighing the rock cuttings periodically, and can dynamically peel off the cuttings during weighing, which not only solves the technical problem that the single funnel groove cannot measure the continuously generated rock cuttings during the turning process, but also The technical problem of accumulative weighing error caused by cuttings adhesion is solved. Such as figure 2 As shown, the method for obtaining the amount of cuttings that has been returned comprises the following steps:

[0105] Step S1: Pre-set the receiving station and the waiting station at the outlet of the rock cuttings vibrating screen. When weighing starts, the rotating mechanism controls the two receiving containers 1 at the receiving station and the waiting station according to the rotation cycle...

Embodiment 3

[0113] On the basis of Example 2, this embodiment also further defines the positions of the material receiving station and the waiting station. Specifically, the material receiving station and the waiting station are respectively arranged symmetrically in the vertical direction. Above and below, and preferably the receiving station is located directly above the station to be connected. Under this condition, the rotating mechanism controls the two material receiving containers 1 to rotate circularly between the material receiving station and the waiting station. Circular weighing and rock cuttings are separated from the receiving container 1 when rotating.

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Abstract

The invention discloses a borehole cleanliness quantitative evaluation method based on a rock debris return condition. The method comprises the following steps that step 1, a theoretical rock debris volume capable of returning to the ground under a well is calculated; 2, the returned rock debris amount which has returned to the ground in the drilling process and the to-be-returned rock debris amount which is late to return to the ground after drilling is stopped are obtained, the actual rock debris amount which can return to the ground is obtained according to the returned rock debris amount and the to-be-returned rock debris amount, and the actual rock debris volume which can actually return to the ground is obtained according to the actual rock debris amount; and 3, the borehole cleanliness is determined according to the theoretical rock debris volume and the actual rock debris volume, and borehole cleanliness is quantitatively evaluated according to the borehole cleanliness. According to the method, the shaft bottom rock debris accumulation condition can be judged by comparing the amount of rock debris returned from the ground in the drilling process with the amount of rock debris generated at the shaft bottom theoretically, a basis is provided for rock debris bed form judgment, ground parameter optimization is guided, and the operation risk is reduced.

Description

technical field [0001] The invention belongs to the technical field of petroleum drilling, and in particular relates to a quantitative evaluation method for borehole cleaning based on cuttings return. Background technique [0002] The horizontal section of a shale gas horizontal well is more than 1,500m long. In the late stage of drilling, the accumulation of cuttings can easily cause friction and torque to increase significantly, and even lead to complex situations such as drill sticking and pump holding, which seriously affects drilling safety and causes project delays and costs. Increase. At the same time, if the wellbore is not clean, it may also lead to problems such as difficulty in running logging tools and casing cementing. In Changning, Weiyuan and other areas, pipe sticking accidents occurred frequently in the Longmaxi Formation due to unclean boreholes. As of the end of 2020, 49 sets of rotary steerable tools have been buried in the Sichuan-Chongqing area of ​​C...

Claims

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Application Information

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IPC IPC(8): E21B47/00G06Q10/06G06Q50/02
CPCE21B47/00G06Q10/06393G06Q50/02
Inventor 李雷张继川谭宾陆灯云许期聪邓虎李枝林姚建林刘伟赵福金冯明刘洲
Owner BC P INC CHINA NAT PETROLEUM CORP
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