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Spiral continuous weighing method for rock debris

A spiral and cuttings technology, applied in the field of oil drilling, can solve problems such as poor wellbore cleaning, affecting downhole safety, and measurement errors, and achieve the effects of long-term dynamic measurement, avoiding weighing errors, and accurate measurement accuracy

Pending Publication Date: 2022-02-18
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

[0006] 3. The paper "Research and Application of Calculation Method for Cuttings Volume Balance in Horizontal Wells" discloses that in the horizontal section of a horizontal well, due to the gravity effect of cuttings and the serious eccentricity of drilling tools, cuttings or falling blocks are easily trapped in the annulus, causing well Poor eye cleaning and well wall instability seriously affect downhole safety
However, due to the frequent action of the opening and closing mechanism of the funnel groove, it is easy to damage and fail
[0012] In addition, for the patent document whose publication number is CN112537608A, if the height between the feed inlet and the screw conveyor is too high during measurement, the impact of falling materials will cause considerable measurement errors
At the same time, high-viscosity drilling cuttings tend to stick to the rotating shaft of the screw conveyor, which leads to measurement errors

Method used

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  • Spiral continuous weighing method for rock debris

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Experimental program
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Effect test

Embodiment 1

[0048] This embodiment discloses a spiral continuous weighing method for cuttings, which is realized based on a screw conveyor, such as figure 1 As shown, the screw conveyor includes a bracket 10, an explosion-proof motor 7, a screw shaft 1, a weighing assembly 2 and a delivery cylinder 3, and the delivery cylinder 3 includes a feeding section 4, a metering section 5 and a discharge section that are sequentially sealed and softly connected. Section 6, that is, between the feed section 4 and the metering section 5 and between the metering section 5 and the discharge section 6 are soft connection structures, and the joints are sealed. After the connection, the feed section 4, the metering section 5 and the discharge section Material segment 6 is relatively independent. In addition, the upper part of the feeding section 4 is provided with a feeding nozzle 8 , and the lower part of the discharging section 6 is provided with a discharging nozzle 9 , and the discharging nozzle 9 is ...

Embodiment 2

[0066] On the basis of Example 1, in order to further improve the accuracy of cuttings weighing and measuring, this embodiment further limits the connection mode of the feed section 4, the metering section 5 and the discharge section 6 in the delivery cylinder 3, as figure 1 As shown in the middle thick black line, the sealed soft connection refers to the sealed connection between the feed section 4 and the metering section 5 and between the metering section 5 and the discharge section 6, and the flexible rubber material is The rubber sleeve is made of oil-resistant, high-temperature-resistant hydrogenated nitrile rubber. When connecting, put the two ends of the rubber sleeve on the feeding section 4 and the metering section 5 or respectively put them on the metering section 5 and the outlet section 6, and then use the throat clamp to fix it. In this specific connection mode, the feeding impact of cuttings will not be transmitted to the weighing and measuring section 5 in the ...

Embodiment 3

[0068] On the basis of Embodiment 1 or Embodiment 2, in order to improve the instantaneous feeding capacity of cuttings, this embodiment further limits the pitch of the screw shaft 1 . Specifically, in this embodiment, the pitch of the screw shaft 1 in the feeding section 4 is set to be greater than the pitch of the screw shaft 1 in the metering section 5, and preferably the pitch of the screw shaft 1 in the feeding section 4 is set as the screw pitch in the metering section 5. 1.5 times the pitch of axis 1. Further, in actual use, the pitch of the screw shaft 1 in the metering section 5 can be set to 160 mm, and the pitch of the screw shaft 1 in the feeding section 4 is 240 mm. Under these conditions, the instantaneous feeding capacity of the screw conveyor can reach 24m³ / h.

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Abstract

The invention discloses a spiral continuous weighing method for rock debris, which comprises a spiral shaft, a weighing assembly and a conveying cylinder, the conveying cylinder comprises a feeding section, a metering section and a discharging section which are sequentially and flexibly connected in a sealed manner, the spiral shaft is rotatably arranged in the conveying cylinder, and two ends of the spiral shaft are respectively arranged in the feeding section and the discharging section through bearings. The weighing assembly is fixedly connected below the metering section; Therefore, during continuous weighing, 1, the transmission metering period of the rock debris passing through the metering section is calculated; 2, the weight of rock debris in the metering section in each transmission metering period is collected according to the transmission metering period; and 3, summing of the weights of the rock debris collected in each transmission metering period is carried out to obtain the total weight of the rock debris. An existing spiral conveyor is improved to be of a three-section type connecting structure comprising feeding, weighing and discharging, so that the impact of feeding and the adhesion of rock debris cannot affect the weighing of the rock debris, and the processing capacity of instantaneous mass feeding is improved while the weighing precision is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of petroleum drilling, and in particular relates to a spiral type continuous weighing method for cuttings. 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 ​​CNPC, resulting in huge los...

Claims

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Application Information

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IPC IPC(8): G01G17/04B65G33/14
CPCG01G17/04B65G33/14B65G2201/045
Inventor 李雷张继川谭宾干建华姚建林谢意韩烈祥李伟成张晓琳赵福金刘彬舒畅
Owner BC P INC CHINA NAT PETROLEUM CORP
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