Water recovery pipe column and water recovery method for water source well cable-laying nonmetal coiled tubing

A non-metal, water source well technology, applied in the fields of fluid extraction, earthwork drilling, wellbore/well components, etc., can solve the problems of fragile cables, easily damaged external cables, poor water extraction effect, etc., and achieves fewer joints. , The effect of solving the problem of cable wear and reducing the accident rate

Pending Publication Date: 2020-10-02
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the problem that the existing cable is fragile and the overall water harvesting effect is poor, the purpose of the present invention is to provide a water source well with a non-metallic coiled tubing water harvesting string and a water harvesting method. In the continuous pipe body, the cables are effectively protected, avoiding the shortcoming that the external cables are easily damaged

Method used

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  • Water recovery pipe column and water recovery method for water source well cable-laying nonmetal coiled tubing
  • Water recovery pipe column and water recovery method for water source well cable-laying nonmetal coiled tubing

Examples

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Effect test

Embodiment 1

[0022] In order to overcome the problem that the existing cable is fragile and the whole water harvesting effect is poor, the present invention provides such figure 1 and figure 2 Shown is a non-metallic coiled tubing water production string and water production method for a water source well. The present invention is a method in which the cable is directly built into the coiled tube body, the cable is effectively protected, and the external cable is easily damaged. shortcoming. At the same time, the cables laid in the pipe body can provide power for downhole submersible pumps and other equipment, collect downhole data for real-time transmission and monitoring, etc., effectively reducing the chance of submersible pumps and other equipment being burned due to cable damage, and avoiding workover and other operations.

[0023] A cabled non-metallic coiled tubing string for water source wells, comprising a standard wellhead 1, a ground control system 9 located outside the standa...

Embodiment 2

[0029] On the basis of Embodiment 1, in this embodiment, preferably, the short joint 2 of the oil pipe is connected to the non-metallic coiled oil tubing 4 through the conversion joint 3 .

[0030] Preferably, a cable connector is reserved at the upper end of the cable-laying non-metallic coiled tubing 4 , and the cable connector is electrically connected to the ground control system 9 .

[0031] Preferably, the lower end of the cable-laying non-metallic coiled tubing 4 is connected to the liquid level monitoring device 5 through a conversion joint 3 .

[0032] Preferably, the cable-clad non-metallic coiled tubing 4 is a coiled tubing in which cables are armored in the tube body.

[0033] like figure 2 As shown, the cabled non-metallic coiled tubing 4 includes a pipe core 401 and a reinforcement layer 402 , a tensile layer 404 and an outer protective layer 405 that are sheathed outside the pipe core 401 in sequence. The cable armor is between the reinforcement layer 402 and...

Embodiment 3

[0040] Based on Embodiment 1 or 2, this embodiment provides a method for producing water by cable-coated non-metallic coiled tubing in a water source well. The wellbore and the downhole tubing string are partly submerged below the liquid level; after the tubing string is put in place, the standard wellhead 1 is installed, the cable is connected to the ground control system 9, and the downhole water source well liquid level monitoring device 5 is collected by laying non-metallic coiled tubing 4 Data, real-time monitoring of the current and voltage working parameters of the submersible pump 7 and the motor 8, recording the water production of the water source well, and at the same time realizing the on-site start and stop of the water source well.

[0041] The part of the downhole pipe string submerged below the liquid surface is to place the motor 8 above 3 meters away from the bottom of the well, and the submersible pump 7 is submerged at least 1 meter below the dynamic water l...

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Abstract

The invention provides a water recovery pipe column and a water recovery method for a water source well cable-laying nonmetal coiled tubing. The pipe column comprises a standard wellhead, a ground control system arranged outside the standard wellhead, the cable-laying nonmetal coiled tubing mounted at the lower end of the standard wellhead, a liquid level monitoring device, an electric submersiblepump and a motor, wherein the cable-laying nonmetal coiled tubing is connected with the standard wellhead through a tubing nipple; the ground control system is electrically connected with the upper end of the cable-laying nonmetal coiled tubing; the liquid level monitoring device, the electric submersible pump and the motor are sequentially connected to the lower end of the cable-laying nonmetalcoiled tubing; and the liquid level monitoring device, the electric submersible pump and the motor are electrically connected with the ground control system. The water recovery pipe column has the advantages of being capable of effectively resisting corrosion and abrasion, few in joint, small in friction resistance, high in construction speed and long in service life by adopting the cable-laying nonmetal coiled tubing, friction between a cable and a well wall can be avoided, the problem of cable abrasion is fundamentally solved, the accident rate of a water source well is reduced, and the service life of the submersible pump is prolonged.

Description

technical field [0001] The invention belongs to the technical field of water harvesting from water source wells in oil fields, and in particular relates to a water harvesting string and a water harvesting method for water source wells with cable-coated non-metal coiled tubing. Background technique [0002] At present, the water source wells in Changqing Oilfield use large-diameter steel oil pipes for water production. Due to the influence of minerals in the water, long-term production leads to serious rust and corrosion of the metal pipe body. The lower end is connected to the downhole submersible pump, motor, etc., and it is easy to cause friction and wear with the well wall during the process of going into the well and starting the well, resulting in burning of the cable, short circuit of the electric submersible pump motor, or burning of the motor. The submersible pump damage and well repair costs caused by cable damage have become an important capital investment in the u...

Claims

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Application Information

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IPC IPC(8): E21B43/00E21B49/00E21B47/047
CPCE21B43/00E21B43/121E21B49/00
Inventor 王薇姚斌王守虎王俊涛申晓莉何汝贤王晓娥
Owner PETROCHINA CO LTD
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