CN103758496A - Nitrogen flooding concentric layered steam injection pipe column and nitrogen flooding concentric layered steam injection method - Google Patents
Nitrogen flooding concentric layered steam injection pipe column and nitrogen flooding concentric layered steam injection method Download PDFInfo
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- CN103758496A CN103758496A CN201410001417.XA CN201410001417A CN103758496A CN 103758496 A CN103758496 A CN 103758496A CN 201410001417 A CN201410001417 A CN 201410001417A CN 103758496 A CN103758496 A CN 103758496A
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Abstract
The invention provides a nitrogen flooding concentric layered steam injection pipe column and a nitrogen flooding concentric layered steam injection method. The nitrogen flooding concentric layered steam injection pipe column comprises an outer pipe column and an inner pipe column, wherein the outer pipe column comprises an outer pipe, an upper packer, a first sieve pipe and a lower packer which are sequentially connected to one another from top to bottom; the lower end of the lower packer is connected with a sealer through a coupling; the inner pipe column comprises an inner pipe, a sealing pipe and a second sieve pipe which are sequentially connected to one anther from top to bottom by an oil tube; the bottom of the second sieve pipe is connected with a screwed plug; when the inner pipe column is inserted in the outer pipe column, annular space is formed between the inner pipe and the outer pipe column; the sealing pipe is fixedly clamped in the inner cavity of the sealer; the outer side wall of the sealing pipe correspondingly clings to the inner side wall of the sealer; and the second sieve pipe is positioned on the lower side of the sealer. According to the nitrogen flooding concentric layered steam injection pipe column and the nitrogen flooding concentric layered steam injection method, the control capability on injected nitrogen is enhanced by regulating and controlling steam injection quantities of different layers, stored layers are uniformly used, and the economic benefit on nitrogen injection production is improved.
Description
Technical field
The present invention relates to the concentric Stratified Waterflooding of a kind of nitrogen flooding and method, be applicable to need the thin oil of layering note nitrogen flooding exploitation, high solidifying oil or heavy crude reservoir.
Background technology
At present, domestic multiple field use note nitrogen flooding production practice technology improve difficult mining-employed reserves recovery ratio, mainly comprise block buried hill fractured hydrocarbon reservoir, block glutenite oil-gas reservoir, low-permeability sandstone oil-gas reservoir, unconventional oil-gas reservoir etc.Its mechanism mainly contains three aspects: the one, and utilize the dilatancy of nitrogen with excellent to carry out elasticity and drive; The 2nd, utilize the water-fast feature of nitrogen to carry out water cone, water breakthrough control; The 3rd, utilize the gravitational differentiation of nitrogen to carry out gas cap drive.But the note nitrogen tubing string adopting is at present generally the mode that adopts general steam injection, deposits problem in the following areas: be one, to control nitrogen injection; Two, cannot realize reservoir evenly employs; Three, has channeling is more serious, and production-injection ratio is low, and then has had a strong impact on economic benefit.
Therefore, the concentric Stratified Waterflooding of a kind of nitrogen flooding of necessary design and method, to overcome the defect of prior art.
Summary of the invention
The object of the invention is to be to provide the concentric Stratified Waterflooding of a kind of nitrogen flooding and method, by the regulation and control to each interval steam injection amount, strengthen the control ability to nitrogen injection, realize reservoir and evenly employ, improve note nitrogen exploitation economic benefit.
For this reason, the present invention proposes the concentric Stratified Waterflooding of a kind of nitrogen flooding, and it comprises:
Outer tube tubing string, comprises the outer tube, upper packer, the first screen casing and the lower packet that connect successively from top to bottom, and the lower end of described lower packet is connected with sealer by box cupling;
Inner tube tubing string, comprise the inner tube, sealed tube and the second screen casing that by oil pipe, connect successively from top to bottom, the bottom of described the second screen casing is connected with plug, when described inner tube tubing string is inserted in described outer tube tubing string, between described inner tube and described outer tube tubing string, be formed with annular space, described sealed tube is fixed in the inner chamber of described sealer, and its lateral wall is corresponding closely connected with the inside wall of described sealer, and described the second screen casing is positioned at the downside of described sealer.
The concentric Stratified Waterflooding of nitrogen flooding as above, wherein, described sealer is a tubing string, its inside wall convexes with a ring portion, the medial surface of described ring portion is formed with a conical surface and one first anchor ring from top to bottom successively, the internal diameter of described conical surface lower end is identical with the internal diameter of described the first anchor ring, and be less than the internal diameter of described conical surface upper end, the lateral wall of described sealed tube is provided with a mating face and the second anchor ring successively, the shape of described mating face and the described conical surface matches, both are corresponding closely connected and be fixed, described the second anchor ring is corresponding to be sealed and contacts mutually with described the first anchor ring.
The concentric Stratified Waterflooding of nitrogen flooding as above, wherein, is evenly equipped with multiple protuberances vertically on the described conical surface, be evenly equipped with vertically multiple recesses on described mating face, and each described protuberance correspondence is embedded in each described recess.
The concentric Stratified Waterflooding of nitrogen flooding as above, wherein, described protuberance and recess are circulus, correspondence is arranged on the described conical surface and mating face.
The concentric Stratified Waterflooding of nitrogen flooding as above, wherein, is further connected by oil pipe column between described upper packer, the first screen casing and lower packet successively.
The concentric Stratified Waterflooding of nitrogen flooding as above, wherein, described upper packer and lower packing are Y521 type packer or Y453 type packer.
The present invention also proposes a kind of concentric layer steam injection method of nitrogen flooding, adopts the concentric Stratified Waterflooding of nitrogen flooding as above, and the concentric layer steam injection method of described nitrogen flooding comprises the following steps:
A) described outer tube tubing string is lowered to the assigned address in pit shaft, make the position of described the first screen casing relative with the upside oil reservoir of down-hole, subsequently, set described upper packer and lower packet, so that the oil jacket annular space between described outer tube tubing string and pit shaft is divided into upper annular space, middle annular space and lower annular space;
B) described inner tube tubing string is inserted in to described outer tube tubing string, with composition concentric tube column, and make the position of described the second screen casing relative with the downside oil reservoir of down-hole, wherein, between described inner tube and described outer tube tubing string, be formed with annular space, the lateral wall of described sealed tube and the inside wall of described sealer are corresponding closely connected and be fixed;
C) from ground respectively to nitrogen injection described annular space, inner tube, wherein, the nitrogen that injects described annular space enters this upside oil reservoir through described the first screen casing, annular space, and the nitrogen that injects described inner tube enters this downside oil reservoir by described the second screen casing, lower annular space.
The concentric layer steam injection method of nitrogen flooding as above; wherein; step b) and step c) between; also comprise step b1): in the upper annular space forming between described outer tube tubing string and described pit shaft, inject pit shaft protection liquid, make described pit shaft protection liquid be filled in the upside of described upper packer.
The concentric Stratified Waterflooding of nitrogen flooding provided by the invention and method, realized the laminated distributor under well steam injection of note nitrogen flooding well, by the regulation and control to each interval steam injection amount, the control ability of reinforcement to nitrogen injection, realizing reservoir evenly employs, improve production-injection ratio, extend gas injection cycle, promote gas injection effect and note nitrogen exploitation economic benefit.
Accompanying drawing explanation
The following drawings is only intended to the present invention to schematically illustrate and explain, not delimit the scope of the invention.Wherein:
Fig. 1 is the composition structural representation of the concentric Stratified Waterflooding of nitrogen flooding of the present invention.
Fig. 2 is the partial enlarged drawing at A place in Fig. 1, and the sealer showing in figure and sealed tube are in separated position.
Critical element label declaration:
11 outer tube 12 upper packers
13 first screen casing 14 lower packets
141 box cupling 15 sealers
150 ring portion 151 conical surfaces
1511 protuberance 152 first anchor rings
16 oil pipe column 20 oil pipes
21 inner tube 22 sealed tubes
221 mating face 2211 recesses
222 second anchor ring 23 second screen casings
24 plug H annular spaces
The specific embodiment
The invention provides the concentric Stratified Waterflooding of a kind of nitrogen flooding, it comprises: outer tube tubing string, comprise the outer tube, upper packer, the first screen casing and the lower packet that connect successively from top to bottom, and the lower end of described lower packet is connected with sealer by box cupling; Inner tube tubing string, comprise the inner tube, sealed tube and the second screen casing that by oil pipe, connect successively from top to bottom, the bottom of described the second screen casing is connected with plug, when described inner tube tubing string is inserted in described outer tube tubing string, between described inner tube and described outer tube tubing string, be formed with annular space, described sealed tube is fixed in the inner chamber of described sealer, and its lateral wall is corresponding closely connected with the inside wall of described sealer, and described the second screen casing is positioned at the downside of described sealer.
The present invention also provides a kind of nitrogen flooding concentric layer steam injection method, comprise the following steps: described outer tube tubing string is lowered to the assigned address in pit shaft, make the position of described the first screen casing relative with the upside oil reservoir of down-hole, subsequently, set described upper packer and lower packet, so that the oil jacket annular space between described outer tube tubing string and pit shaft is divided into upper annular space, middle annular space and lower annular space; Described inner tube tubing string is inserted in to described outer tube tubing string, with composition concentric tube column, and make the position of described the second screen casing relative with the downside oil reservoir of down-hole, wherein, between described inner tube and described outer tube tubing string, be formed with annular space, the lateral wall of described sealed tube and the inside wall of described sealer are corresponding closely connected and be fixed; From ground respectively to nitrogen injection described annular space, inner tube, wherein, the nitrogen that injects described annular space enters this upside oil reservoir through described the first screen casing, annular space, and the nitrogen that injects described inner tube enters this downside oil reservoir by described the second screen casing, lower annular space.
The concentric Stratified Waterflooding of nitrogen flooding of the present invention and method, can realize the laminated distributor under well steam injection of note nitrogen flooding well, the control ability of reinforcement to nitrogen injection, guaranteed that reservoir evenly employs, and then improved production-injection ratio, and extended gas injection cycle, improved gas injection effect, improve note nitrogen flooding exploitation economic benefit, guaranteed the gas tightness of gas injection tube column simultaneously.
For technical characterictic of the present invention, object and effect being had more clearly, understand, below in conjunction with accompanying drawing and preferred embodiment, the concentric Stratified Waterflooding of nitrogen flooding that the present invention is proposed and the specific embodiment, structure, feature and the effect of method, be described in detail as follows.In addition, by the explanation of the specific embodiment, when can more being goed deep into concrete understanding for technological means and the effect reaching predetermined object and take to the present invention, however institute's accompanying drawing be only to provide with reference to and explanation use, be not used for the present invention to be limited.
Fig. 1 is the composition structural representation of the concentric Stratified Waterflooding of nitrogen flooding of the present invention.Fig. 2 is the partial enlarged drawing at A place in Fig. 1, and the sealer showing in figure and sealed tube are in separated position.
As shown in Figure 1, the concentric Stratified Waterflooding of nitrogen flooding that the present invention proposes, it comprises outer tube tubing string and inner tube tubing string.Wherein, described outer tube tubing string comprises the outer tube 11, upper packer 12, the first screen casing 13 and the lower packet 14 that connect successively from top to bottom, and the lower end of described lower packet 14 is connected with sealer 15 by box cupling 141;
Described inner tube tubing string, comprise the inner tube 21, sealed tube 22 and the second screen casing 23 that by oil pipe 20, connect successively from top to bottom, the bottom of described the second screen casing 23 is connected with plug 24, when described inner tube tubing string is inserted in described outer tube tubing string, between described inner tube 21 and described outer tube tubing string, be formed with annular space H, 22 of described sealed tubes are fixed in the inner chamber of described sealer 15, and its lateral wall is corresponding closely connected with the inside wall of described sealer 15, described the second screen casing 23 is positioned at the downside of described sealer 15.
Wherein, please also refer to Fig. 2, described sealer 15 is a tubing string, its inside wall convexes with a ring portion 150, the medial surface of described ring portion 150 is formed with a conical surface 151 and one first anchor ring 152 from top to bottom successively, the internal diameter of the described conical surface 151 lower ends is identical with the internal diameter of described the first anchor ring 152, and be less than the internal diameter of the described conical surface 151 upper ends, the lateral wall of described sealed tube 22 is provided with a mating face 221 and the second anchor ring 222 successively, described mating face 221 matches with the shape of the described conical surface 151, both are corresponding closely connected and be fixed, 222 correspondences of described the second anchor ring seal and contact mutually with described the first anchor ring 152.Particularly, the internal diameter of described ring portion 150 upper ends is greater than the internal diameter of its lower end, so that its medial surface forms the described conical surface, and the lateral wall of described sealed tube 22 is made another cone structure (i.e. this mating face) matching with this conical surface, thus, sealing device 15 connects and fixes by the mode of taper fit mutually with sealing pipe 22, has both been convenient to both mutual location, can reach preferably sealing performance.Certainly, combination for sealer 15 with sealed tube 22, be not limited to above structure, such as, both can directly fix by the mode of tight fit (transition or interference fit), in addition, being lowered to inner tube tubing string be, after sealed tube contacts with sealer, normally slow forward inner tube tubing string, slowly to increase the load of inner tube tubing string, so that sealed tube and sealer have good sealing effectiveness.
Wherein, in order to improve the sealing effectiveness between sealer and sealed tube, on the preferred described conical surface 151, be evenly equipped with vertically multiple protuberances 1511, be evenly equipped with vertically multiple recesses 2211 on described mating face 221, each described protuberance 1511 correspondences are embedded in each described recess 2211.It is worth mentioning that, the height of this protuberance and the degree of depth of recess are grade, have both been convenient to the mutual clamping of sealer and sealed tube, are beneficial to again and realize sealing mutually.
Further, described protuberance 1511 and recess 2211 are circulus, and correspondence is arranged on the described conical surface 151 and mating face 221, and the cross section on this conical surface, mating face is the structure of wave wire, to improve sealing performance.
In addition, between described upper packer 12, the first screen casing 13 and lower packet 14, further by oil pipe column 16, be connected successively, when work, can, by choosing the oil pipe column of different length, be satisfied with the user demand of different well depths.
In addition, preferred described upper packer 12 and lower packing 14 are Y521 type packer, in use, by rotation, on carry and transfer outer tube tubing string, can realize setting of packer, simple to operation, certainly, in actual job, be not limited to Y521 type packer, such as, described upper packer and lower packet also can be selected Y453 type packer, and because the process that sets of above-mentioned packer is prior art, therefore not to repeat here;
At work, this inner tube tubing string is inserted in outer tube tubing string, composition concentric tube column, be connected in again below wellhead assembly and utilize surface line, respectively to annular space and inner tube tubing string nitrogen injection, with correspondence, to upside oil reservoir, the downside oil reservoir place interval of differing heights, implement nitrogen flooding operation, particularly, utilizing surface line in the process of nitrogen injection in pit shaft, by the annular space nitrogen injection between described outer tube tubing string and inner tube tubing string and enter upside oil reservoir, by inner tube tubing string nitrogen injection and enter downside oil reservoir.In addition, because upside oil reservoir, downside oil reservoir are separately by independent path implement nitrogen injection, therefore, can to the nitrogen injection rate of each oil reservoir, regulate and control easily, extend gas injection cycle, realize reservoir and evenly employ, can improve production-injection ratio, overcome the deficiency that prior art has channeling is serious simultaneously.It is pointed out that above-mentioned wellhead assembly and surface line are prior art, therefore not to repeat here.
The present invention also proposes a kind of concentric layer steam injection method of nitrogen flooding, and the method adopts above-mentioned steam injection string, and particularly, the concentric layer steam injection method of this nitrogen flooding comprises the following steps:
A) described outer tube tubing string is lowered in pit shaft to 3 assigned address, make the position of described the first screen casing 13 relative with the upside oil reservoir 41 of down-hole, subsequently, set described upper packer 12 and lower packet 14, so that the oil jacket annular space between described outer tube tubing string and pit shaft 3 is separated to 5 as upper annular space 51, middle annular space 52 and lower annular space 53;
B) described inner tube tubing string is inserted in to described outer tube tubing string, with composition concentric tube column, and make the position of described the second screen casing 23 relative with the downside oil reservoir 42 of down-hole, wherein, between described inner tube 21 and described outer tube tubing string, be formed with annular space H, the inside wall of the lateral wall of described sealed tube 15 and described sealer 15 is corresponding closely connected and be fixed;
C) from ground respectively to nitrogen injection described annular space H, inner tube 21, wherein, the nitrogen that injects described annular space H enters this upside oil reservoir 41 through described the first screen casing 13, annular space 52, the nitrogen that injects described inner tube 21 enters this downside oil reservoir 42 by described the second screen casing 23, lower annular space 53, also be, shown in figure, nitrogen enters this upside oil reservoir 41 and downside oil reservoir 42 by described the first screen casing 13, the second screen casing 23 correspondences, to realize the operation of each oil reservoir being carried out to nitrogen flooding.
Step a) and step b) between, also comprise step b1): to injecting pit shaft protection liquid 6 in the space between described outer tube tubing string and described pit shaft 3, described pit shaft protection liquid 6 is filled in the upper annular space 51 of described upper packer 14 upsides.By injecting pit shaft protection liquid, the inside and outside pressure of energy balance outer tube 11 when work, protection outer tube 11 and pit shaft 3.
The concentric Stratified Waterflooding of nitrogen flooding provided by the invention and method, realized the laminated distributor under well steam injection of note nitrogen flooding well, by the regulation and control to each interval steam injection amount, the control ability of reinforcement to nitrogen injection, realizing reservoir evenly employs, improve production-injection ratio, extend gas injection cycle, promote gas injection effect and note nitrogen exploitation economic benefit.
The foregoing is only the schematic specific embodiment of the present invention, not in order to limit scope of the present invention.Any those skilled in the art, not departing from equivalent variations and the modification done under the prerequisite of design of the present invention and principle, all should belong to the scope of protection of the invention.
Claims (8)
1. the concentric Stratified Waterflooding of nitrogen flooding, is characterized in that, the concentric Stratified Waterflooding of described nitrogen flooding comprises:
Outer tube tubing string, comprises the outer tube, upper packer, the first screen casing and the lower packet that connect successively from top to bottom, and the lower end of described lower packet is connected with sealer by box cupling;
Inner tube tubing string, comprise the inner tube, sealed tube and the second screen casing that by oil pipe, connect successively from top to bottom, the bottom of described the second screen casing is connected with plug, when described inner tube tubing string is inserted in described outer tube tubing string, between described inner tube and described outer tube tubing string, be formed with annular space, described sealed tube is fixed in the inner chamber of described sealer, and its lateral wall is corresponding closely connected with the inside wall of described sealer, and described the second screen casing is positioned at the downside of described sealer.
2. the concentric Stratified Waterflooding of nitrogen flooding as claimed in claim 1, it is characterized in that, described sealer is a tubing string, its inside wall convexes with a ring portion, the medial surface of described ring portion is formed with a conical surface and one first anchor ring from top to bottom successively, the internal diameter of described conical surface lower end is identical with the internal diameter of described the first anchor ring, and be less than the internal diameter of described conical surface upper end, the lateral wall of described sealed tube is provided with a mating face and the second anchor ring successively, the shape of described mating face and the described conical surface matches, both are corresponding closely connected and be fixed, described the second anchor ring is corresponding to be sealed and contacts mutually with described the first anchor ring.
3. the concentric Stratified Waterflooding of nitrogen flooding as claimed in claim 2, is characterized in that, is evenly equipped with vertically multiple protuberances on the described conical surface, is evenly equipped with vertically multiple recesses on described mating face, and each described protuberance correspondence is embedded in each described recess.
4. the concentric Stratified Waterflooding of nitrogen flooding as claimed in claim 3, is characterized in that, described protuberance and recess are circulus, and correspondence is arranged on the described conical surface and mating face.
5. the concentric Stratified Waterflooding of nitrogen flooding as claimed in claim 1, is characterized in that, between described upper packer, the first screen casing and lower packet, further by oil pipe column, is connected successively.
6. the concentric Stratified Waterflooding of nitrogen flooding as claimed in claim 1, is characterized in that, described upper packer and lower packing are Y521 type packer or Y453 type packer.
7. the concentric layer steam injection method of nitrogen flooding, adopts the concentric Stratified Waterflooding of nitrogen flooding as described in any one in claim 1 to 5, and the concentric layer steam injection method of described nitrogen flooding comprises the following steps:
A) described outer tube tubing string is lowered to the assigned address in pit shaft, make the position of described the first screen casing relative with the upside oil reservoir of down-hole, subsequently, set described upper packer and lower packet, so that the oil jacket annular space between described outer tube tubing string and pit shaft is divided into upper annular space, middle annular space and lower annular space;
B) described inner tube tubing string is inserted in to described outer tube tubing string, with composition concentric tube column, and make the position of described the second screen casing relative with the downside oil reservoir of down-hole, wherein, between described inner tube and described outer tube tubing string, be formed with annular space, the lateral wall of described sealed tube and the inside wall of described sealer are corresponding closely connected and be fixed;
C) from ground respectively to nitrogen injection described annular space, inner tube, wherein, the nitrogen that injects described annular space enters this upside oil reservoir through described the first screen casing, annular space, and the nitrogen that injects described inner tube enters this downside oil reservoir by described the second screen casing, lower annular space.
8. the concentric layer steam injection method of nitrogen flooding as claimed in claim 7; it is characterized in that; step b) and step c) between; also comprise step b1): in the upper annular space forming between described outer tube tubing string and described pit shaft, inject pit shaft protection liquid, make described pit shaft protection liquid be filled in the upside of described upper packer.
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| CN201410001417.XA CN103758496B (en) | 2014-01-02 | 2014-01-02 | A kind of nitrogen flooding concentric layers steam injection string and method |
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| CN201410001417.XA CN103758496B (en) | 2014-01-02 | 2014-01-02 | A kind of nitrogen flooding concentric layers steam injection string and method |
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| CN109424340A (en) * | 2017-09-01 | 2019-03-05 | 中国石油化工股份有限公司 | A method of note nitrogen exploits shallow-thin layer super-viscous oil |
| CN111502622A (en) * | 2019-01-30 | 2020-08-07 | 中国石油天然气股份有限公司 | Concentric layered steam drive pipe column structure and layered steam drive method thereof |
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| CN203729960U (en) * | 2014-01-02 | 2014-07-23 | 中国石油天然气股份有限公司 | Concentric separate steam injection string for nitrogen flooding |
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| CN111502622A (en) * | 2019-01-30 | 2020-08-07 | 中国石油天然气股份有限公司 | Concentric layered steam drive pipe column structure and layered steam drive method thereof |
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| CN103758496B (en) | 2016-04-06 |
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