CN87101671A - Concentric double pipe stratified injection water technology - Google Patents
Concentric double pipe stratified injection water technology Download PDFInfo
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- CN87101671A CN87101671A CN 87101671 CN87101671A CN87101671A CN 87101671 A CN87101671 A CN 87101671A CN 87101671 CN87101671 CN 87101671 CN 87101671 A CN87101671 A CN 87101671A CN 87101671 A CN87101671 A CN 87101671A
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- injection
- concentric double
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- waterflood
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Abstract
A kind of concentric double pipe stratified injection water technology is characterized in that concentric double layer oil pipe tubing string, adopts two hydrostatic self-locking packers and an intubate seal assembly to come the packing stratum, forms three separate waterflood paths.The injection allocation of ground manifold has three waterflood-transmission lines, and dispensing is three layers simultaneously, also can select the wherein any one deck or two-layer of notes, can also strengthen operation to individual layer in the pressure limit of appointment when needing.Water injection rate is allocated by the high pressure measurement instrument of injection allocation of ground manifold. and this process management is convenient, data is accurate, and the injection allocation qualification rate is up to more than 90%.
Description
The invention relates on the oil field is to improve oil recovery factor, and flushing is realized a kind of new technology-concentric double pipe stratified injection water technology of stable production of crude oil high yield to keep strata pressure.This technology is specially adapted to the degree of depth dark water injection well in 1500 meters～2500 meters.
For incremental oil production, present most of oil fields all are the oil-field flooding technology that adopts single tubing string completion.Though this water injection technology also can be realized the multilevel hierarchy water filling, the injection allocation qualification rate is very low.This mainly be because, the size of this technology water injection rate is to control by the throttling water nozzle, whether water nozzle can control to injected water volume the plan injection rate, then need to be subjected to the degree of stability of water injection pressure, the size of injected water volume, the quality of water quality, and the influence of the multiple foeign elements such as length of water injection time.In order to keep necessary injection allocation qualification rate, this technology dropping-fishing test workload is very big, and occurs blocking, falling accident easily.Adopt this technology water filling will repair well every year on average one time, the operating period of equipment only has 1～1.5 year.Because this tubing string pulling difficulty is so should not be used for darker water injection well.
The object of the present invention is to provide a kind of concentric double pipe stratified injection water technology, changing single tubing string is concentric double layer oil pipe post, replaces the throttling water nozzle with the high pressure measurement instrument, to overcome the deficiency of above-mentioned technology.
Accompanying drawing 1 is a concentric double pipe tubular column structure schematic diagram.
Accompanying drawing 2 is structures of injection allocation of ground manifold, and flow process is with turbine flowmeter metering method schematic diagram.
Accompanying drawing 3 is High-pressure watermeter metering method schematic diagrames.
From accompanying drawing 1 concentric double layer oil pipe post (1) (2) as can be seen, adopt two hydrostatic self-locking packers (3) (8) and an intubate seal assembly (5) shutoff sealing, form three separate waterflood paths.So both three layers of dispensings simultaneously also can be selected wherein one deck or two-layer arbitrarily of notes,
Can also in the pressure limit of appointment, (the well head pump pressure is less than 250 atmospheric pressure) strengthen operation to individual layer.The level pressure seat envelope single current valve (10) that is connected the concentric tube column afterbody is when 220 atmospheric pressure, can the forward choked flow to reach the purpose of base sealed packer, when pressure is higher than 220 atmospheric pressure, the descending water injection hole of abdicating of sliding sleeve (12) on the level pressure seat envelope single current valve (10) is to realize lower floor's water filling.Level pressure seat envelope single current valve can also the recycled back well-flushing.
Well head (22), jackscrew four-way (21), high pressure measurement instrument (23) etc. are formed the injection allocation of ground manifold as can be seen from accompanying drawing 2.Well head (22) stacks with jackscrew four-way (21) and is connected, and constitutes three waterflood-transmission lines (15), (17), (19), divide pour down, in, last three layers.Replace the size that the throttling water nozzle is allocated injected water volume with high pressure measurement instrument (23).The injection allocation of ground manifold connects simple, easy construction.
The concentric tube column optimum composition method is 1.66 " * 2 1/2 "; When if 1.66 " tubing is short, also can adopt 1 1/2 " * 3 " compound mode.More than two kinds of sleeve pipes that compound mode was suitable for be 5 1/2 "～5 3/4 ".The high pressure measurement instrument has two kinds of High-pressure watermeter and turbine flowmeters, and the user can select to use as the case may be.
In specific implementation process, the first step is: drift size gauge tool drifting down behind the sand-flushing, change the jackscrew four-way then.The outer oil tubing string (1) that will be connected with level pressure seat envelope single current valve (10) 755 hydrostatic self-locking packers (8), intubate seal assembly (5) and 751 hydrostatic self-locking packers (8) is again taken well head down to projected depth.The second step seat envelope: well head connects the high pressure line of cementing truck, suppresses 150～220 atmospheric pressure, and sealed packer expands.Packer set when the oil pipe internal pressure is higher than 200 atmospheric pressure, the control pin (11) on the level pressure seat envelope single current valve (10) is cut off, and sliding sleeve (12) is descending, abdicates the water injection hole on the water filling borehole jack (13).At this moment seat envelope action is finished.The 3rd step pressure testing: carry out positive and negative general pressure testing.Unload well head after qualified, prepare internal layer tubing string (2) down.The 4th step is the internal layer tubing string down: internal layer tubing string (2) afterbody connects sealing intubate (7), down to intubate seal assembly (5) position.Join pipe nipple then, stay 5～8cm to press distance, add ballast.Open the sliding sleeve (6) on the intubate seal assembly (5), make the middle level waterflood path unimpeded.Sealing intubate (7) will in, the lower floor circular passage shuts.At this moment internal layer tubing string (2) has descended.The 5th step pressure testing: seated again well head, from the interior pressure testing of internal layer tubing string (2).Whether observe sealing intubate (7) misses.Again from the annular pressure test of outer oil pipe (1) with internal layer oil pipe (2).Have or not pressure to change and outer spilling water by observing the upper and lower layer of well head, verify whether upper and lower two-stage packer seals.The 6th step stake: after pressure testing is qualified, connect the ground waterflood-transmission line, begin normal water filling according to accompanying drawing 2 or accompanying drawing 3.Arrange waterflood-transmission line (15) on the ground and pour down layer by internal layer oil pipe (2); Middle row's waterflood-transmission line (17) is annotated the middle level by the circular passage between the inside and outside layer oil pipe; Arrange waterflood-transmission line (19) down and annotate the upper strata by the circular passage between outer oil pipe (1) and the sleeve pipe (14).Sometimes in order to improve the water absorbing properties of water accepting layer, need that activating agent or water under high pressure broken block etc. are squeezed in layering and strengthen operation.At this moment detachable three plugs (16) (18) (20) of well head one side down connect and strengthen service line, carry out the individual layer construction.The 7th step deblocking:, carry out the deblocking operation if when needing to repair in the defective or use of pressure testing.Its work progress is as follows: at first unload well head, propose the internal layer tubing string.After connecing the deblocking instrument on the internal layer tubing string that proposes, again with it down to the precalculated position.Deblocking sliding sleeve (9) under the pier on 755 packers (8) upwards proposes the deblocking sliding sleeve (4) on 751 packers (3).After proposing the deblocking instrument then, carry the outer oil tubing string on again.At this moment the packer self-locking device takes off lock.The packer deblocking was lost efficacy in hydrostatic cylinder water inlet.
Advantage of the present invention is as follows:
1. there are three separate waterflood paths the down-hole, manifold of ground has three waterflood-transmission lines corresponding with it, both three layers of dispensings simultaneously can be selected wherein one deck or two-layer arbitrarily of notes again, and can strengthen operation to any individual layer in the pressure limit of regulation.
2. adopt two hydrostatic self-locking packer sealings, make a whole set of technology can be applicable to the deep-well water filling, and sealing effectiveness is good, deblocking is easy.
3. water injection rate is allocated by the high pressure measurement instrument of manifold of ground, the influence that not changed by strata pressure.Data accurately and reliably.The height that rate is closed in injection allocation depends on the precision of measuring instrument, generally up to more than 90%.And Operation and maintenance are all very convenient.
4. cancelled the throttling water nozzle, water injection rate has so also avoided a large amount of down-hole sections to drag for test jobs by ground high pressure measurement instrument allotment, prolongation at double the application life of tubing string, generally can reach 4～5 years.
Claims (3)
1, a kind of concentric double pipe stratified injection water technology is characterized in that down-hole oil tube is concentric double layer oil pipe tubing string, and adopts two hydrostatic self-locking packers and an intubate seal assembly to come the packing stratum, forms three separate waterflood paths.
2,, it is characterized in that the injection allocation of ground manifold has three injection allocation pipeline dispensing upper, middle and lower-rankings according to the described technology of claim 1.
3, according to the described technology of claim 1, the allotment that it is characterized in that water injection rate is to be controlled by the high pressure measurement instrument of injection allocation of ground manifold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87101671 CN87101671A (en) | 1987-03-06 | 1987-03-06 | Concentric double pipe stratified injection water technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87101671 CN87101671A (en) | 1987-03-06 | 1987-03-06 | Concentric double pipe stratified injection water technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN87101671A true CN87101671A (en) | 1988-09-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87101671 Pending CN87101671A (en) | 1987-03-06 | 1987-03-06 | Concentric double pipe stratified injection water technology |
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| CN (1) | CN87101671A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101074602B (en) * | 2007-07-18 | 2010-10-13 | 中国石油化工股份有限公司胜利油田分公司孤东采油厂 | Stratified injection tubular pile |
| CN102242614A (en) * | 2011-07-19 | 2011-11-16 | 中国石油天然股份有限公司 | Coaxial double-layer gas injection well mouth device |
| CN102953716A (en) * | 2011-08-19 | 2013-03-06 | 中国石油天然气集团公司 | Parallel double-tube separate layer water injection string |
| CN104141477A (en) * | 2014-07-28 | 2014-11-12 | 克拉玛依市红都有限责任公司 | Concentric three-tube separated layer water injection device and using method thereof |
| CN109707327A (en) * | 2019-01-21 | 2019-05-03 | 中国石油天然气股份有限公司 | Concentric double-tube separate injection pressurized operation string |
-
1987
- 1987-03-06 CN CN 87101671 patent/CN87101671A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101074602B (en) * | 2007-07-18 | 2010-10-13 | 中国石油化工股份有限公司胜利油田分公司孤东采油厂 | Stratified injection tubular pile |
| CN102242614A (en) * | 2011-07-19 | 2011-11-16 | 中国石油天然股份有限公司 | Coaxial double-layer gas injection well mouth device |
| CN102953716A (en) * | 2011-08-19 | 2013-03-06 | 中国石油天然气集团公司 | Parallel double-tube separate layer water injection string |
| CN104141477A (en) * | 2014-07-28 | 2014-11-12 | 克拉玛依市红都有限责任公司 | Concentric three-tube separated layer water injection device and using method thereof |
| CN109707327A (en) * | 2019-01-21 | 2019-05-03 | 中国石油天然气股份有限公司 | Concentric double-tube separate injection pressurized operation string |
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