CN103821470A

CN103821470A - Oil well hot nitrogen injection well washing technological method and system

Info

Publication number: CN103821470A
Application number: CN201410099979.2A
Authority: CN
Inventors: 徐勋; 徐东; 胡伟
Original assignee: XINKE DEVELOPMENT & MANUFACTURE Co Ltd
Current assignee: XINKE DEVELOPMENT & MANUFACTURE Co Ltd
Priority date: 2014-03-19
Filing date: 2014-03-19
Publication date: 2014-05-28
Anticipated expiration: 2034-03-19
Also published as: CN103821470B

Abstract

The invention relates to an oil well hot nitrogen injection well washing technological method and system. According to the method, after high-pressure nitrogen continuously produced by a nitrogen making vehicle set is heated through a heating device and reaches the needed temperature, hot nitrogen is injected into a well through a connecting manifold and a well opening device for well washing operation, and the purposes of paraffin removal, dirty removal, unblocking or viscosity reduction of thickened oil, drainage assistance and improvement of the well yield are achieved. The system is composed of the nitrogen making vehicle set, the nitrogen heating device, the connecting manifold, the well opening device and an underground pipe column. The oil well heat injection nitrogen well washing technological method and system are reasonable in design, easy to implement and good in effect, the problems existing in the paraffin removal, the dirty removal and the unblocking process of the high-content paraffin oil well can be solved, the method and system can also be used for mixing-injection viscosity reduction of the thickened oil well and steam, drainage assistance, yield increasing, line swiping of an oil and gas gathering pipeline on the oil field ground and the unblocking operation, and the method and system have the advantages of being low in running cost, capable of achieving energy conservation and environmental protection, convenient to use, flexible and the like.

Description

Oil well heat injection nitrogen technology for washing well method and system

Technical field:

The present invention relates to a kind of technology for washing well method and system of removing wax deposition, fouling, de-plugging and heavy oil wells viscosity reduction, the row of helping for oil exploitation process oil well, belong to oil production technology technology type.

Background technology:

In oil exploitation oil well production process, particularly, in high waxy oil well, heavy oil wells manufacturing process, tubing wax, scale formation are very serious, and oil flow channel is diminished gradually, even block, and cause oil well output to reduce and even stop production.In the situation that there is serious wax deposition, fouling, because oil pipe internal pressure increases, also can increase the weight of the load of downhole pump, shorten the application life of oil well pump, affect oil well and normally produce.For above-mentioned phenomenon, the on-the-spot methods such as mechanical paraffin removal, paraffin removing with chemical method, heating power well-flushing that conventionally adopt are to paraffin removal from oil well de-plugging, to guarantee that oil well normally produces.But mechanical paraffin removal not only effect is not good enough, and affect oil well output, paraffin removing with chemical method cost is higher, and effect can not be satisfactory.Existing heating power well-washing wax-cleaning technology generally adopts boiler heat hot carrier, brings heat energy into pit shaft as deep fat, hot water etc. and by heat transfer medium, improves temperature in wellbore, makes its fusing point that exceedes wax, makes it to dissolve, thereby reaches the object of wax removal.Utilize deep fat as heat transfer medium high cost, the shortcoming of hot-water flooding well-flushing is that the thermal efficiency is low, and the flushing fluid of use is many, drives a well drainage period more than three days, and can damage sensitiveness oil reservoir.In addition, the equipment that this kind of wax removal de-plugging mode used is many, and energy consumption is high, and efficiency is low, and exhaust emission is large, large compared with high oil well operation difficulty for borehole pressure, and the difficulty of the high oil well of the content of wax and heavy oil wells wax removal being washed to dirt work is larger.Also have a kind of method that is produced hot flue gases and come well-flushing by burning, the waste gas producing due to its, to tubing and casing seriously corroded, does not use at present.

Summary of the invention:

The object of the present invention is to provide and a kind ofly remove oil well paraffinication, fouling, de-plugging and viscosity reduction, the row of helping is effective, running cost is low, the oil well heat injection nitrogen technology for washing well method and system of energy-conserving and environment-protective.

Technical scheme of the present invention is as follows.Oil well heat injection nitrogen technology for washing well method provided by the invention be by nitrogen car group processed produce continuously high pressure nitrogen through the heating of nitrogen heater reach temperature required after, hot nitrogen carries out clean-out service by connecting under manifold and wellhead assembly Injection Well, reaches the object of wax removal, snaking, de-plugging or reducing thick oil viscosity, the row of helping, raising oil well output.The implementation step of this technology for washing well method is as follows:

1. will nitrogen car group processed and nitrogen heater rational deployment on oil well site, between the two, connect by pipeline, and by connecting manifold, the outlet of nitrogen heater be connected with treating the sleeve pipe arrival end on the well mouth of oil well device of clean-out service;

2. utilize nitrogen car group processed to produce and produce continuously high pressure nitrogen, transport to nitrogen heater by pipeline;

3. utilize nitrogen heater to heat nitrogen, nitrogen temperature can be set between 50 ℃～350 ℃ by the technological requirement of removing paraffin and washing well job design or adjust;

4. be heated to temperature required hot high pressure nitrogen and transfer to well mouth of oil well device through connecting manifold, by sleeve pipe arrival end, from oil sets annular space Injection Well, nitrogen injection pressure can change with wellbore pressure, regulates arbitrarily from 0～35MPa.

The oil well heat injection nitrogen technology for washing well system that the present invention adopts is made up of nitrogen car group processed, nitrogen heater, connection manifold, wellhead assembly and down-hole string, nitrogen car group processed is connected with nitrogen heater, nitrogen heater is connected with wellhead assembly by connecting manifold, and wellhead assembly is connected with down-hole string.

Oil well heat injection nitrogen technology for washing well method and system provided by the invention are reasonable in design, easy to implement, respond well, utilize it not only can solve high waxy oil well wax removal, snaking, de-plugging problem, can also be used for pipeline purging, the de-plugging operation of heavy oil wells and steam mixed water injection viscosity reduction, the row of helping, volume increase and mining site ground Oil-Gas Gathering Transferring Pipeline, have that running cost is low, energy-conserving and environment-protective, the advantage such as convenient, flexible.

Accompanying drawing explanation:

Fig. 1 is connection flow process general structure schematic diagram of the present invention.Fig. 2 is the structural representation of nitrogen heater 2.

The specific embodiment:

Below in conjunction with accompanying drawing, enforcement of the present invention is described further.

As shown in the figure, the present invention is made up of nitrogen car group 1 processed, nitrogen heater 2, connection manifold 3, wellhead assembly 4 and down-hole string 5, and its annexation as previously mentioned.Wherein, nitrogen car group 1 processed adopts vehicular Electric Drive membrane nitrogen device (patent No.: ZL201020198230.0), utilizes its high-purity nitrogen, continuously produces high pressure nitrogen.Nitrogen heater 2 (seeing Fig. 2) is made up of switch board 2-1, cable 2-2, heating furnace 2-3 and heating rod 2-4, heating rod 2-4 is placed in heating furnace 2-3, heating rod 2-4 outer end is connected with switch board 2-1 by cable 2-2, heating furnace 2-3 front and back ends is respectively equipped with high pressure nitrogen entrance and high pressure-temperature nitrogen outlet, and nitrogen heating-up temperature can be set on request or adjust between 50 ℃～350 ℃.Nitrogen heater 2 two ends by pipeline be connected manifold 3 and be connected with the sleeve pipe arrival end on wellhead assembly 4 with nitrogen car group 1 processed respectively.Production tree and down-hole pumping pipe string that wellhead assembly 4, down-hole string 5 are oil well to be adopted while normally producing.

Claims

1. an oil well heat injection nitrogen technology for washing well method, it is characterized in that, this process be by nitrogen car group processed produce continuously high pressure nitrogen through heater heating reach temperature required after, carry out clean-out service by connecting under manifold and wellhead assembly Injection Well, reach the object of wax removal, snaking, de-plugging or reducing thick oil viscosity, the row of helping, raising oil well output; Implementation step is as follows:

(1) will nitrogen car group processed and nitrogen heater rational deployment on oil well site, between the two, connect by pipeline, and by connecting manifold, the outlet of nitrogen heater be connected with treating the sleeve pipe arrival end on the well mouth of oil well device of clean-out service;

(2) utilize nitrogen car group processed to produce and produce continuously high pressure nitrogen, transport to nitrogen heater by pipeline;

(3) utilize nitrogen heater to heat nitrogen, nitrogen temperature can be set between 50 ℃～350 ℃ by the technological requirement of removing paraffin and washing well job design or adjust;

(4) be heated to temperature required hot high pressure nitrogen and transfer to well mouth of oil well device through connecting manifold, by sleeve pipe arrival end, from oil sets annular space Injection Well, nitrogen injection pressure can change with wellbore pressure, regulates arbitrarily from 0～35MPa.

2. an oil well heat injection nitrogen technology for washing well system, it is characterized in that, this system is made up of nitrogen car group processed (1) nitrogen heater (2), connection manifold (3), wellhead assembly (4) and down-hole string (5), nitrogen car group processed (1) is connected with nitrogen heater (2), nitrogen heater (2) is connected with wellhead assembly (4) by connecting manifold (3), and wellhead assembly (4) is connected with down-hole string (5).

3. oil well heat injection nitrogen technology for washing well system according to claim 1, is characterized in that, nitrogen car group 1 processed adopts vehicular Electric Drive membrane nitrogen device, utilizes its high-purity nitrogen, continuously produces high pressure nitrogen.

4. oil well heat injection nitrogen technology for washing well system according to claim 1, it is characterized in that, nitrogen heater 2 is by switch board (2-1), cable (2-2), heating furnace (2-3) and heating rod (2-4) composition, heating rod (2-4) is placed in heating furnace (2-3), heating rod (2-4) outer end is connected with switch board (2-1) by cable (2-2), (2-3) is front for heating furnace, rear end is respectively equipped with high pressure nitrogen entrance and high pressure-temperature nitrogen outlet, nitrogen heating-up temperature can be set on request or adjust between 50 ℃～350 ℃.

5. oil well heat injection nitrogen technology for washing well system according to claim 1, it is characterized in that, this process is carried out paraffin removal from oil well, snaking, de-plugging operation by injecting hot nitrogen, also can be used for that heavy oil wells and steam mixed water injection play viscosity reduction, the row of helping acts on, also can be used for ground Oil-Gas Gathering Transferring Pipeline pipeline purging de-plugging operation.