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Rodless oil production underground dosing production string as well as underground dosing system and dosing method thereof

A technology for producing pipe strings and dosing systems, which is applied in wellbore/well components, earthmoving, cleaning tools, etc., can solve the problem of poor effect of high liquid level oil wells, short validity period of chemical antiscalants for formation squeezing, and adverse effects. Dosing cycle and other issues, to reduce pump jam accidents, solve the poor anti-scaling effect, and save the total amount of dosing

Pending Publication Date: 2020-11-13
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the effect of annulus filling is not good for high liquid level oil wells, the size of the solid anti-scaling cylinder connected to the pump is affected by the size of the anti-scaling cylinder, and the effective period of the chemical anti-scaling agent squeezed into the formation is short, etc.

Method used

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  • Rodless oil production underground dosing production string as well as underground dosing system and dosing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] refer to figure 1 The shown a rodless oil production downhole dosing production string includes a drainer 6, a submersible pump 7, a coupling 9, a protector 10 and a submersible motor 11; the drainer 6, the submersible pump 7, The coupling 9, the protector 10 and the submersible motor 11 are sequentially connected from top to bottom.

[0031] When it is necessary to add chemicals to the well for anti-scaling, the submersible motor 11, protector 10, coupling 9, submersible pump 7, oil drainer 6 and oil pipe 5 are connected sequentially from bottom to top on the ground; The equipment is connected with a rodless oil production downhole dosing production string; then, the submersible motor 11, the protector 10, the coupling 9, the submersible pump 7, and the oil drainer 6 are put into the well in sequence, and the dosing related Bring the equipment into the well, go down to the preset position, install the wellhead and complete the well; store the anti-scaling agent that n...

Embodiment 2

[0036] refer to figure 1 A rodless oil production downhole dosing system shown includes at least one rodless downhole dosing production string, and also includes a medicine storage mechanism and a power and control mechanism; the power and control mechanism are respectively connected with the medicine storage mechanism and the medicine storage mechanism. The rodless oil production downhole dosing production string is connected to provide power for the drug storage mechanism and the rodless oil production downhole dosing production string, and to control the drug storage mechanism and the rodless oil production downhole dosing production string; the drug storage The mechanism is connected with the downhole chemical dosing production string in the rodless production well.

[0037] In actual use, connect the rodless oil production downhole dosing production string on the ground, and then connect the drug storage mechanism, power and control mechanism with the rodless downhole dos...

Embodiment 3

[0039] refer to figure 1 A rodless downhole dosing system for oil production shown is based on the second embodiment: the medicine storage mechanism includes a medicine storage tank 14, a medicine injection pump 15, a medicine control valve 16 and a stainless steel capillary injection pipe 17; A chemical injection pump 15 is connected to the chemical storage tank 14, the output end of the chemical injection pump 15 is connected to one end of the stainless steel capillary injection pipe 17 through the chemical control valve 16, and the other end of the stainless steel capillary injection pipe 17 is bound to the rodless oil production well. Dosing on the outside of the production string.

[0040] In actual use, first connect the rodless downhole oil production well dosing production string on the ground, and then fix one end of the stainless steel capillary injection pipe 17 between the submersible pump 7 and the submersible motor 11; , the protector 10, the coupling 9, the sub...

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Abstract

The invention belongs to the technical field of rodless oil production underground operation, and particularly relates to a rodless oil production underground dosing production string as well as a rodless oil production underground dosing system and a dosing method thereof. The rodless oil production underground dosing production string comprises an oil drain device, an oil-submerged pump, a coupler, a protector and an oil-submerged motor; and the oil drain device, the oil-submerged pump, the coupler, the protector and the oil-submerged motor are sequentially connected from top to bottom to form the rodless oil production underground dosing production string. The rodless oil production underground dosing system is composed of the rodless oil production underground dosing production string,a dosing mechanism and a power and control mechanism, and long-acting and accurate filling of an underground anti-scaling agent is achieved.

Description

technical field [0001] The invention belongs to the technical field of rodless oil production downhole operation, and in particular relates to a downhole chemical addition production string, a downhole chemical addition system and a method for rodless oil recovery. Background technique [0002] Oil well scaling is a common problem in oilfield development. At present, anti-scaling methods include annulus injection, connection of solid anti-scaling cylinder under the pump, and injection of chemical anti-scaling agent in the formation. Among them, the effect of annulus filling is not good for high liquid level oil wells, the size of the solid anti-scaling cylinder connected to the pump affects the dosing period, and the injection of chemical anti-scaling agents in the formation has a short validity period. In order to explore a long-term chemical dosing method, taking advantage of the rodless oil production technology, the cable was lowered and the stainless steel capillary in...

Claims

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Application Information

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IPC IPC(8): E21B37/06
CPCE21B37/06
Inventor 牛彩云甘庆明李佰涛魏韦张磊郭靖樊松
Owner PETROCHINA CO LTD
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