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

[0029] Embodiment one:

[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 needs to be injected into the relevant equipment for dosing, start the oil well for production, and adjust the relevant dosing according to the preset amount of dosing in the oil well. Equipment and chemicals are directly added to the well.

[0032] The submersible pump 7 includes a submersible direct drive screw pump, a submersible plunger pump, and a submersible centrifugal pump, and its function is to lift the liquid in the wellbore to the surface. Submersible motor 11 provides lifting power.

[0033] What the protector 10 in the present embodiment adopts is prior art, is used for compensating the loss of lubricating oil in the submersible motor 11, balances the pressure inside and outside the submersible motor 11, prevents well fluid from entering the submersible motor 11 and bears the load of the submersible pump 7 Axial load action.

[0034] By adopting the technical scheme of the invention, the antiscalant can be directly applied to the vicinity of the oil layer through the rodless oil production downhole dosing production string, and the problem of poor antiscaling effect of adding the antiscalant at the wellhead of the high liquid level well is solved. And can reduce the pump card, prolong the inspection cycle of the pump.

[0035] Embodiment two:

[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 dosing production string; The oil motor 11, the protector 10, the coupling 9, the submersible pump 7, and the drainer 6 enter the well, and go down to the preset position to install the wellhead and complete the well; store the anti-scaling agent that needs to be injected into the medicine storage mechanism, power and control The mechanism starts the oil well for production, adjusts the drug storage mechanism according to the preset dosage of the oil well, starts the drug storage mechanism, the drug is directly added to the downhole, and the anti-scaling agent directly acts on the vicinity of the oil layer, which not only realizes the continuous dosing of the downhole, but also saves Adding the total amount of medicine, the descaling effect is better.

[0038] Embodiment three:

[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 submersible pump 7, and the drainer 6 are put into the well. During the downhole process, the stainless steel capillary injection pipe 17 and the submersible cable 13 of the power and control mechanism are laid together and lowered into the wellbore, and are fixed by clamping at intervals. Install the wellhead at the preset position and complete the well; pass the submersible cable 13 and the stainless steel capillary injection pipe 17 through the wellhead, connect the submersible cable 13 with the power and control mechanism; pass the stainless steel capillary injection pipe 17 through the chemical control valve 16 and the chemical agent Injection pump 15 is connected. After that, the antiscaling agent to be injected is stored in the agent storage tank 14, the power and control mechanism starts the oil well production, adjusts the agent control valve 16 according to the preset amount of oil well addition, starts the agent injection pump 15, and injects the agent through the stainless steel capillary The pipe 17 is directly and accurately added to the vicinity of the downhole oil layer, realizing continuous and long-term downhole dosing, and saving the total amount of dosing.

[0041]The agent storage tank 14 in this embodiment is used to inject chemical agent solution downhole into the reservoir, and its size and material only need to meet the requirements of injection volume and chemical agent corrosion resistance. The chemical injection pump 15 provides the power to inject the anti-scaling agent downhole. The medicine control valve 16 is used for regulating and accurately metering the size of the injection volume.