CN102777149A - Method and device for removing blockage in production strings of oil and gas wells - Google Patents
Method and device for removing blockage in production strings of oil and gas wells Download PDFInfo
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- CN102777149A CN102777149A CN2012102528605A CN201210252860A CN102777149A CN 102777149 A CN102777149 A CN 102777149A CN 2012102528605 A CN2012102528605 A CN 2012102528605A CN 201210252860 A CN201210252860 A CN 201210252860A CN 102777149 A CN102777149 A CN 102777149A
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Abstract
The invention provides a method and a device for removing blockage in production strings of oil and gas wells. The method includes: heating hydrate at a blockage position to enable the hydrate to be decomposed by heating and moisture in the hydrate to be vaporized so that the blockage is removed; and arranging a heat insulation pipeline penetrating through a wellhead and the blockage position in a production string, injecting high-temperature gas from the wellhead, performing heat exchange between the high-temperature gas and the hydrate after the high-temperature gas contacts with the hydrate at the blockage position, enabling the hydrate to be decomposed by heating and the blockage to be removed, and exhausting steam produced by the hydrate and the high-temperature gas subjecting to heat exchange via an annulus of the production string. The method for removing the blockage in the production strings of the oil and gas wells can be implemented without opening and killing the wells and moving the strings in the wells, the device for removing the blockage in the production strings of the oil and gas wells is simple in structure, safe to use, convenient and rapid, and workover treatment by using a workover rig or a coil unit in routine work is avoided, so that construction risk and operation cost are reduced greatly; and the method for removing the blockage in the production strings of the oil and gas wells is wide in applicable working condition and application range, environment-friendly, low-carbon, beneficial to national energy saving and emission reduction and easy to use and popularize on a large scale.
Description
Technical field
The present invention relates to the oil and gas well drilling field, specifically is the annular space heating plug-removing device in a kind of oil gas well formation testing (gas) field.
Background technology
In natural gas well recovery process, be prone to generate hydrate in the operation tubing string and result in blockage, must carry out block clearing to hydrate wherein after, the operation tubing string could continue production.This hydrate formation condition mainly contains three, and the one, sufficiently high pressure is arranged, the 2nd, enough low temperature is arranged, the 3rd, there is free water.So, remove this hydrate method and mainly contain temperature, minimizing free water and the three kinds of modes of reduction pressure of improving.
Prior art generally all is to suppress or removes the hydrate obstruction through improving temperature; During deciphering very difficulty, be not easy de-plugging; Particularly in the well during operation tubing string band storm valve; If take the routine work mode, use workover rig or coiled tubing car de-plugging operation, there is the problem that difficulty is big, cost is high; In addition; Prior art has heater is dropped to the method for removing blockage that obstruction place is heated hydrate, but adopts this method, generally needs to go up the motor-driven well head of well workover; Simultaneously will be with the heater G.I.H, complex equipments, transfer and to mention step comparatively loaded down with trivial details; The steam that heating back produces can not effectively discharge, vexed in well, potential safety hazard arranged; Simultaneously, when hydrate is heated, also can change the state of natural gas in the well, destabilizing factor is arranged, safe and reliable inadequately.
Summary of the invention
The objective of the invention is to: to using workover rig or coiled tubing car de-plugging operation, have the problem that difficulty is big, cost is high, designed obstruction, safe and effective reliable method and isolated plant thereof in a kind of releasing oil gas well operation tubing string.
The technical scheme that the present invention adopted is:
The release method that stops up in a kind of oil gas well operation tubing string is that the hydrate to obstruction place heats, and makes hydrate decomposes, the vaporization of moisture wherein, stops up and removes; Through the utilidor that connects well head to obstruction place is set in the operation tubing string; High-temperature gas is injected from well head; Behind the hydrate of high-temperature gas contact obstruction place, heat exchange with it, hydrate decomposes, block clearing; Simultaneously, the steam of hydrate generation and the high-temperature gas after the heat exchange are discharged through the annular space of operation tubing string.
Said high-temperature gas is a steam.
The decontrol that stops up in a kind of oil gas well operation tubing string, this device comprise that high-temperature gas generating means, high-temperature gas infeed device and reaction back gas concentration unit; It is a utilidor that is arranged in the operation tubing string that high-temperature gas infeeds device; Entrance connects corresponding obstruction place of high-temperature gas outlet, pipe outlet of high-temperature gas generating means; High-temperature gas makes the hydrate decomposes of obstruction place; Simultaneously, steam that hydrate produces and the high-temperature gas after the heat exchange are discharged through the annular space of operation tubing string, are collected by reaction back gas concentration unit.
It is a heat-preserving hose that is arranged on the coil pipe device that said high-temperature gas infeeds device, and heat-preserving hose is wrapped on the runner of coil pipe device, through rotating wheel, the height of adjusting heat-preserving hose outlet in well.
The diameter of said heat-preserving hose is reduced by entrance to exit direction.
Said utilidor is provided with safety valve.
Said utilidor is provided with pressure meter.
Said reaction back gas concentration unit infeeds device with high-temperature gas and is connected, and the high-temperature gas that reaction back gas concentration unit is collected infeeds the device circulation through high-temperature gas and infeeds in the well.
The beneficial effect that the present invention produced is:
The release method that stops up in the oil gas well operation tubing string of the present invention can be popularized in an all-round way and be applied to completion and study field already with oil (gas) well surveying, has following superiority than prior art:
1, this method can be not driving a well, implementing under the tubing string condition in the not kill-job, motionless well, and is safe in utilization, convenient and swift, avoided routine work to adopt workover rig or coiled tubing car to carry out workover treatment, greatly reduces construction risk and operating cost;
2, the high-temperature gas of this method is sent into, is discharged from the tubing string annular space from utilidor, and the high-temperature gas of discharge can circulate again and send into utilidor, carries out heat exchange next time, controlled, safe and reliable, the energy-conserving and environment-protective of this process circulation;
3, this method operation is simple, with low cost, use simple and easy, safe and reliable, be very easy to realize that applicable working condition, scope are wide, the environmental protection low-carbon (LC) is beneficial to the requirement of national energy-saving and emission-reduction, is easy to use on a large scale and promote;
4, simple, the interior annular space heat cycles device of this well of this device well head part separation structure has satisfied the requirement that is lowered to from casing annulus;
5, in this device well part-structure simple, need not transfer heater hydrate is directly heated, safe and reliable;
My unit is in Yuanba District piece focus development well unit dam 103H well, use method of the present invention and device; Avoided use workover rig or coiled tubing car to carry out the de-plugging operation; Effectively remove hydrate obstruction in the well depth 200m scope tubing string; Practice thrift nearly 1,000 ten thousand yuan of cost, obtain good economic and social benefit.Gas east, river send engineering main product gas field to comprise general phosgene field (exploration area 1116.089km2 at present; Stock number is 8916 * 108m3), bight block, Yuanba District piece etc., and HTHP high sour gas well work operations amount is big, and every mouthful of producing well hydrate all might take place stops up; Annular space heat cycles device meets the trend of the times of group company's " cost efficiency " in applying; Can realize effectively reducing construction cost, greatly reduce security risk simultaneously, have a extensive future.
Description of drawings
Fig. 1 is the structural representation of the decontrol of obstruction in the oil gas well operation tubing string of the present invention.
Label is represented among the figure: 1-inlet, 2-safety valve, 3-pressure meter, 4-coil pipe device, 5-directive wheel, 6-handle, 7-heat-preserving hose, 8-guide pipe, 9-well head, a-heat-preserving hose a section, b-heat-preserving hose b section.
The specific embodiment
The present invention is the release method that stops up in a kind of oil gas well operation tubing string, is that the hydrate to obstruction place heats, and makes hydrate decomposes, the vaporization of moisture wherein, stops up and removes.Through the utilidor that connects well head to obstruction place is set in the operation tubing string; High-temperature gas is injected from well head; Behind the hydrate of high-temperature gas contact obstruction place, heat exchange with it, hydrate decomposes, block clearing; Simultaneously, the steam of hydrate generation and the high-temperature gas after the heat exchange are discharged through the annular space of operation tubing string.The high-temperature gas that this specific embodiment adopts is a steam, can realize that high-temperature gas recycles, effect optimum; But protection scope of the present invention is not limited thereto, and this high-temperature gas can also be nonflammable, the difficult reaction of high temperature, other in stable condition gases.
The decontrol that stops up in the oil gas well operation tubing string of the present invention, this device comprise that high-temperature gas generating means, high-temperature gas infeed device and reaction back gas concentration unit.It is a utilidor that is arranged in the operation tubing string that high-temperature gas infeeds device; Entrance connects corresponding obstruction place of high-temperature gas outlet, pipe outlet of high-temperature gas generating means; High-temperature gas makes the hydrate decomposes of obstruction place; Simultaneously, steam that hydrate produces and the high-temperature gas after the heat exchange are discharged through the annular space of operation tubing string, are collected by reaction back gas concentration unit.Reaction back gas concentration unit infeeds device with high-temperature gas and is connected, and the high-temperature gas that reaction back gas concentration unit is collected infeeds the device circulation through high-temperature gas and infeeds in the well.
Be convenient the going out open height, making it to adapt in the different wells and stop up of utilidor that regulate; The utilidor of this specific embodiment is a heat-preserving hose 7 that is arranged on the coil pipe device 4, the high-temperature gas of the inlet of heat-preserving hose 7 through inlet 1 and high-temperature gas generating means export be connected, obstruction place under the outlet corresponding well of heat-preserving hose 7.For realizing that high-temperature gas recycles, the high-temperature gas that this specific embodiment adopts is a steam, so, will react the back gas concentration unit and connect heat-preserving hose 7 through injection head 1, the water steam of its collection is infeeded in the well obstruction place heat.And heat-preserving hose 7 is wrapped on the runner of coil pipe device 4, and the rear of coil pipe device 4, heat-preserving hose 7 are provided with directive wheel 5, the corresponding heat-preserving hose 4 of the rotation direction of directive wheel 5 axially.Directive wheel 5 is provided with and is used for handle 6, moves forwards or backwards, makes simultaneously runner to rotate through handle 6 rotary steerings wheel 5, drive heat-preserving hose 7, thereby regulates the height of heat-preserving hose 7 outlets in well.
Between inlet 1 and coil pipe device 4, utilidor 7 is provided with safety valve 2 and pressure meter 3.
On the axis that in this specific embodiment, heat-preserving hose 7 is horizontally disposed with, coil pipe device 4 and directive wheel 5 are arranged on heat-preserving hose 7, do not change the direction of heat-preserving hose 7.At the well head place, be provided with the guide pipe 8 of heat-preserving hose 7, guide pipe 8 is that hard material makes, and guide pipe 8 is to be parallel to ground to be provided with, and it is curved that end has an arc, thereby the direction of horizontally disposed heat-preserving hose 7 is adjusted into vertical G.I.H.
These heat-preserving hose 7 employing tension effects are strong, the good material of heat-insulating property makes, and this specific embodiment adopts the Teflon flexible pipe.Simultaneously, for guaranteeing the tensile strength of heat-preserving hose 7, its diameter is gradual change design, concrete being reduced by entrance to exit direction.The method for designing of heat-preserving hose 7 is in this specific embodiment: the thickness basically identical of heat-preserving hose 7; From the entrance of heat-preserving hose 7 to Way out; Setting preceding 1/2～1/3 section heat-preserving hose 7 is the b section, afterwards 1/2～2/3 section heat-preserving hose 7 is the b section, and the diameter of b section is 2/5～5/7 of an a section; Concrete: a segment length is identical with the b section in this specific embodiment, respectively is 1/2 of heat-preserving hose, and a section external diameter is that 7.5mm, internal diameter are 4.95mm, and b section external diameter is that 10.8mm, internal diameter are 8.24mm; In addition, the external diameter of guide pipe is that 25.3mm, internal diameter are 21mm.
The operating procedure of the decontrol that stops up in the oil gas well operation tubing string of the present invention is: at first, guide pipe 8 is installed in the four-way junction of casing of well head 9, heat-preserving hose 7 is passed guide pipe 8, under the lower going-into-well; Secondly, through handle 6 heat-preserving hose is arrived the de-plugging positions of appointment 7 times; Then, connect steam coach, high-temperature vapor is injected through heat-preserving hose 7, hydrate, fluid in the well are heated through injection head 1; At last, reclaim from keeping a grip on the steam that annular space returns, re-inject heat-preserving hose 7, arrive obstruction place heat exchange down, remove until stopping up through injection head 1 through reacting the back gas concentration unit.
Claims (8)
1. the release method that stops up in the oil gas well operation tubing string is that the hydrate to obstruction place heats, and makes hydrate decomposes, the vaporization of moisture wherein, stops up and removes; It is characterized in that: through the utilidor that connects well head to obstruction place is set in the operation tubing string; High-temperature gas is injected from well head; Behind the hydrate of high-temperature gas contact obstruction place, heat exchange with it, hydrate decomposes, block clearing; Simultaneously, the steam of hydrate generation and the high-temperature gas after the heat exchange are discharged through the annular space of operation tubing string.
2. the release method that stops up in the oil gas well operation tubing string according to claim 1, it is characterized in that: said high-temperature gas is a steam.
3. the decontrol that stops up in the oil gas well operation tubing string is characterized in that: this device comprises that high-temperature gas generating means, high-temperature gas infeed device and reaction back gas concentration unit; It is a utilidor that is arranged in the operation tubing string that high-temperature gas infeeds device; Entrance connects corresponding obstruction place of high-temperature gas outlet, pipe outlet of high-temperature gas generating means; High-temperature gas makes the hydrate decomposes of obstruction place; Simultaneously, steam that hydrate produces and the high-temperature gas after the heat exchange are discharged through the annular space of operation tubing string, are collected by reaction back gas concentration unit.
4. the decontrol that stops up in the oil gas well operation tubing string according to claim 3; It is characterized in that: it is a heat-preserving hose that is arranged on the coil pipe device that said high-temperature gas infeeds device; Heat-preserving hose is wrapped on the runner of coil pipe device, through rotating wheel, the height of adjusting heat-preserving hose outlet in well.
5. the decontrol that stops up in the oil gas well operation tubing string according to claim 4, it is characterized in that: the diameter of said heat-preserving hose is reduced by entrance to exit direction.
6. the decontrol that stops up in the oil gas well operation tubing string according to claim 3, it is characterized in that: said utilidor is provided with safety valve.
7. the decontrol that stops up in the oil gas well operation tubing string according to claim 3, it is characterized in that: said utilidor is provided with pressure meter.
8. the decontrol that stops up in the oil gas well operation tubing string according to claim 3; It is characterized in that: said reaction back gas concentration unit infeeds device with high-temperature gas and is connected, and the high-temperature gas that reaction back gas concentration unit is collected infeeds the device circulation through high-temperature gas and infeeds in the well.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102528605A CN102777149A (en) | 2012-07-20 | 2012-07-20 | Method and device for removing blockage in production strings of oil and gas wells |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102528605A CN102777149A (en) | 2012-07-20 | 2012-07-20 | Method and device for removing blockage in production strings of oil and gas wells |
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| CN102777149A true CN102777149A (en) | 2012-11-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012102528605A Pending CN102777149A (en) | 2012-07-20 | 2012-07-20 | Method and device for removing blockage in production strings of oil and gas wells |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3627047A (en) * | 1970-05-19 | 1971-12-14 | Atlantic Richfield Co | Gas producing method |
| CN1278315A (en) * | 1997-10-29 | 2000-12-27 | 托马斯·米克斯 | Method and apparatus for viscosity reduction of clogging hydrocarbons in oil well |
| CN200985774Y (en) * | 2006-12-18 | 2007-12-05 | 辽河石油勘探局 | Air heating blocking removing device |
| CN201241678Y (en) * | 2008-07-29 | 2009-05-20 | 郭金明 | Hydrothermal type pumping rod apparatus |
-
2012
- 2012-07-20 CN CN2012102528605A patent/CN102777149A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3627047A (en) * | 1970-05-19 | 1971-12-14 | Atlantic Richfield Co | Gas producing method |
| CN1278315A (en) * | 1997-10-29 | 2000-12-27 | 托马斯·米克斯 | Method and apparatus for viscosity reduction of clogging hydrocarbons in oil well |
| CN200985774Y (en) * | 2006-12-18 | 2007-12-05 | 辽河石油勘探局 | Air heating blocking removing device |
| CN201241678Y (en) * | 2008-07-29 | 2009-05-20 | 郭金明 | Hydrothermal type pumping rod apparatus |
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Application publication date: 20121114 |