CN109306858B - Polymer injection well online concentration device and method - Google Patents
Polymer injection well online concentration device and method Download PDFInfo
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- CN109306858B CN109306858B CN201710631248.1A CN201710631248A CN109306858B CN 109306858 B CN109306858 B CN 109306858B CN 201710631248 A CN201710631248 A CN 201710631248A CN 109306858 B CN109306858 B CN 109306858B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
Abstract
The invention discloses an on-line concentration device for a polymer injection well, and belongs to the field of tertiary oil recovery. The device includes: the system comprises a dispensing and injecting pipeline, a flow distributor, a dispensing tank, a hopper, an injecting pipeline, a polymer injection pump and a first control valve. The inlet of the injection distribution pipeline is communicated with the polymer injection trunk line of the polymer injection well, and the outlet of the injection distribution pipeline is communicated with the first inlet of the liquid distribution tank; the hopper is communicated with a second inlet of the liquid distribution tank; the outlet of the liquid distribution tank is communicated with the inlet of the injection pipeline, and the outlet of the injection pipeline is communicated with the polymer injection main line; the polymer injection pump is arranged on the injection pipeline; the flow distributor and the first control valve are disposed on the dispensing line. This enrichment facility can carry out adaptability enrichment operation alone to single notes gather well to can carry out online enrichment to it under the prerequisite of annotating that gathers well does not stop production, and, utilize first polymer to drive solution and regard as the preparation mother liquor, avoided the exclusive use to prepare the mother liquor, so not only simplified the preparation flow, and saved the raw materials.
Description
Technical Field
The invention relates to the field of tertiary oil recovery, in particular to an on-line concentration device and method for a polymer injection well.
Background
The polymer flooding is an important technology in tertiary oil recovery, can effectively improve the water-oil mobility ratio, enlarge the swept volume, and effectively improve the displacement efficiency of the dead-end residual oil. At present, a single injection pump is generally used for injecting polymer flooding solution into multiple wells, so that the number of the injection pumps is reduced, and the cost and the land area are reduced.
Due to the difference of reservoir physical properties, the pressure amplification difference of well regions where different polymer injection wells are located is large, in order to ensure formation pressure balance, all polymer injection wells need to be shut down for part of polymer injection wells with low injection pressure, then high-concentration polymer flooding solution is injected into the polymer injection wells with low injection pressure, and further the injection pressure of the polymer flooding solution is improved.
The inventor finds that the prior art has at least the following problems:
when high-concentration polymer flooding solution is injected, the polymer injection well needs to be stopped, and the oil extraction efficiency of the polymer injection well is influenced.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide an on-line concentration device and method for a polymer injection well. The specific technical scheme is as follows:
in a first aspect, an online concentration device for a polymer injection well is provided, the device comprising: the system comprises a dispensing and injecting pipeline, a flow distributor, a dispensing tank, a hopper, an injecting pipeline, a polymer injection pump and a first control valve;
the inlet of the injection allocation pipeline is communicated with a polymer injection trunk line of the polymer injection well, and the outlet of the injection allocation pipeline is communicated with the first inlet of the liquid allocation tank;
the hopper is communicated with a second inlet of the liquid preparation tank;
the outlet of the liquid preparation tank is communicated with the inlet of the injection pipeline, and the outlet of the injection pipeline is communicated with the polymer injection trunk line;
the polymer injection pump is arranged on the injection pipeline;
the flow distributor and the first control valve are disposed on the dispensing line.
Specifically, preferably, the apparatus further comprises: a second control valve;
the second control valve is disposed on the injection line upstream of the injection pump.
Specifically, preferably, the apparatus further comprises: a flow meter;
the flow meter is disposed on the injection line and downstream of the polymer injection pump.
Specifically, preferably, the apparatus further comprises: a first check valve and a second check valve;
the first check valve is disposed on the dispensing line downstream of the flow distributor;
the second check valve is disposed on the injection line downstream of the flow meter.
Specifically, preferably, the apparatus further comprises: a pressure gauge;
the pressure gauge is arranged on the injection pipeline and is positioned at the downstream of the second check valve.
Specifically, preferably, the first inlet and the second inlet of the liquid preparation tank are both arranged at the top of the liquid preparation tank;
the outlet of the liquid preparation tank is arranged at the bottom of the liquid preparation tank.
In particular, preferably, the injection line and the distribution line are both flanged to the injection trunk.
In a second aspect, an online concentration method for a polymer injection well is provided, which comprises the following steps: opening a first control valve, and conveying a preset amount of a first polymer flooding solution from a polymer injection trunk line to a liquid preparation tank through a liquid preparation line by using a flow distributor, and simultaneously adding a preset amount of a polymer flooding solution into the liquid preparation tank from a hopper;
the first polymer flooding solution and the polymer flooding solution are uniformly mixed in the liquid preparation tank to prepare a second polymer flooding solution, and the concentration of the second polymer flooding solution meets the concentration requirement of a polymer injection well;
and conveying the second polymer flooding solution into the polymer injection trunk through an injection pipeline by using a polymer injection pump, mixing the second polymer flooding solution with the first polymer flooding solution in the polymer injection trunk to form a third polymer flooding solution, and injecting the third polymer flooding solution into the polymer injection well to realize the concentration of the polymer injection well.
Specifically, preferably, the method further comprises: while the second polymer flooding solution is flowing through the injection line, a flow meter is utilized to detect a flow rate of the second polymer flooding solution.
Specifically, it is preferable that the internal pressure of the injection line be measured using a pressure gauge while the second polymer flooding solution is flowing through the injection line.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
according to the concentration device provided by the embodiment of the invention, the co-injection pipeline and the injection pipeline are communicated with the polymer injection trunk line of the polymer injection well, under the control of the first control valve, the first polymer flooding solution in the polymer injection trunk line is conveyed into the liquid preparation tank to be used as the mother liquid for preparing the second polymer flooding solution, the second polymer flooding solution can be prepared in the liquid preparation tank on line, and the second polymer flooding solution is conveyed into the polymer injection trunk line on line, so that the on-line concentration of the polymer injection well is realized. Therefore, the concentration device provided by the embodiment of the invention can be used for carrying out independent adaptive concentration operation on a single polymer injection well, carrying out online concentration on the polymer injection well on the premise of not stopping production of the polymer injection well, and avoiding independent use of the prepared mother liquor by using the first polymer flooding solution as the prepared mother liquor, thereby simplifying the preparation process and saving raw materials.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an on-line concentration device for a polymer injection well according to an embodiment of the present invention.
The reference numerals denote:
1-dispensing line;
2-a flow distributor;
3-liquid preparation tank;
4-a hopper;
5-an injection line;
7 a-a first control valve;
7 b-a second control valve;
8-a flow meter;
9 a-a first check valve;
9 b-a second check valve;
10-pressure gauge;
an X-polymer injection well;
y-injection trunk line.
Detailed Description
Unless defined otherwise, all technical terms used in the examples of the present invention have the same meaning as commonly understood by one of ordinary skill in the art. In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
It should be noted that, in the embodiment of the present invention, the injection trunk line Y of the injection well X refers to: in polymer flooding operations, a delivery line delivers polymer flooding solution to a polymer injection well. It will be appreciated that the injection trunk Y may be in communication with a plurality of injection wells to enable injection of polymer flooding solution to the plurality of wells using a single injection pump.
The "upstream" and the "downstream" in the embodiment of the present invention are both based on the flow direction of the fluid, and the fluid can be regarded as flowing from the upstream to the downstream.
In a first aspect, an embodiment of the present invention provides an online concentration device for a polymer injection well, as shown in fig. 1, the device includes: a dispensing and filling pipeline 1, a flow distributor 2, a dispensing tank 3, a hopper 4, a filling pipeline 5, a polymer injection pump 6 and a first control valve 7 a.
Wherein, the inlet of the injection allocation pipeline 1 is communicated with the polymer injection trunk line Y of the polymer injection well X, and the outlet is communicated with the first inlet of the liquid allocation tank 3;
the hopper 4 is communicated with a second inlet of the liquid preparation tank 3;
the outlet of the liquid preparation tank 3 is communicated with the inlet of an injection pipeline 5, and the outlet of the injection pipeline 5 is communicated with a polymer injection main line Y;
the polymer injection pump 6 is arranged on the injection pipeline 5;
a flow distributor 2 and a first control valve 7a are provided on the dispensing line 1.
The following description is given of the working principle of the concentration device:
for a target polymer injection well X with low injection pressure, firstly measuring the injection pressure of the target polymer injection well X, and then determining the concentration requirement of the target polymer injection well X according to the injection pressure, namely what the concentration of the polymer flooding solution needs to be injected into the target polymer injection well X.
After the concentration of the polymer flooding solution for concentration is determined, the amount of the first polymer flooding solution and the amount of the polymer flooding solution which need to be added in the liquid preparation tank 3 are determined according to the concentration of the first polymer flooding solution in the polymer injection main line Y of the target polymer injection well X, so as to prepare a second polymer flooding solution with the desired concentration, and after the second polymer flooding solution is mixed with the first polymer flooding solution in the polymer injection main line Y, a third polymer flooding solution is formed, so that the injection pressure of the polymer injection well X can meet the requirement.
After all the above parameters are determined, the first control valve 7a is opened and a predetermined amount of the first polymer flooding solution from the polymer injection main line Y is delivered to the proportioning tank 3 through the proportioning line 1 by means of the flow distributor 2, and at the same time, a predetermined amount of the polymer flooding solution is added to the proportioning tank 3 from the hopper 4. The first polymer flooding solution and the polymer flooding solution are uniformly mixed in the liquid preparation tank 3 to prepare a second polymer flooding solution with a desired concentration, namely the concentration of the second polymer flooding solution meets the concentration requirement of the target polymer injection well X.
Then, a second polymer flooding solution is conveyed into the polymer injection main line Y through an injection pipeline 5 by using a polymer injection pump 6, the second polymer flooding solution is mixed with the first polymer flooding solution in the polymer injection main line Y to form a third polymer flooding solution, and the third polymer flooding solution is injected into the polymer injection well X to realize concentration of the polymer injection well X, so that the third polymer flooding solution enters an oil layer at a desired injection pressure.
As can be seen from the above description, the concentration device according to the embodiment of the present invention communicates the injection line 5 and the injection line 5 with the main injection line Y of the polymer injection well X, and under the control of the first control valve 7a, the first polymer flooding solution in the main injection line Y is transferred to the preparation tank 3 as the mother solution for preparing the second polymer flooding solution, so that the second polymer flooding solution can be prepared on line in the preparation tank 3 and transferred to the main injection line Y on line, thereby realizing the on-line concentration of the polymer injection well X. Therefore, the concentration device provided by the embodiment of the invention can be used for carrying out independent adaptive concentration operation on a single polymer injection well X, carrying out online concentration on the polymer injection well X on the premise of not stopping production of the polymer injection well X, and avoiding independent use of the prepared mother liquor by using the first polymer flooding solution as the prepared mother liquor, thereby simplifying the preparation process and saving raw materials.
Further, as shown in fig. 1, the apparatus further includes: a second control valve 7b, the second control valve 7b being provided on the injection line 5 upstream of the injection pump 6.
After the first polymer flooding solution and the polymer flooding solution are mixed uniformly in the make-up tank 3, they are preferably allowed to mature for a certain time to ensure that the concentration of the second polymer flooding solution is as desired. By providing the second control valve 7b, the dispensing tank 3 and the injection line 5 are shut off or communicated, and when both are shut off, the second polymer flooding solution can be sufficiently matured in the dispensing tank 3 before being delivered to the injection line 5, and then the matured second polymer flooding solution is delivered to the polymer injection main line Y by opening the second control valve 7 b. The flow rate of the second polymer flooding solution can be controlled by controlling the opening degree of the second control valve 7b so that the second polymer flooding solution is injected into the injection main line Y at a desired injection speed.
The above effect is optimized by placing the second control valve 7b upstream of the injection pump 6 and close to the outlet of the dosing tank 3.
Preferably, as shown in fig. 1, the apparatus provided in the embodiment of the present invention further includes: a flow meter 8, the flow meter 8 being arranged on the injection line 5 downstream of the polymer injection pump 6.
By providing the flow meter 8 as described above so as to measure the flow rate of the second polymer flooding solution in the injection line 5, the opening of the second control valve 7b is adaptively controlled by the flow rate value to ensure that the second polymer flooding solution is injected into the injection line at a desired injection rate, thereby achieving sufficiently uniform mixing with the first polymer flooding solution before entering the injection well X.
Further, as shown in fig. 1, the apparatus provided in the embodiment of the present invention further includes: a first check valve 9a and a second check valve 9 b;
a first check valve 9a is arranged on the dispensing line 1, downstream of the flow distributor 2;
a second check valve 9b is arranged on the injection line 5 downstream of the flow meter 8.
The first check valve 9a is arranged to prevent the first polymer flooding solution from flowing back, the second check valve 9b is arranged to prevent the second polymer flooding solution from flowing back, and the two are matched to realize the smooth and orderly on-line preparation and on-line conveying of the second polymer flooding solution.
Further, as shown in fig. 1, the apparatus provided in the embodiment of the present invention further includes: a pressure gauge 10, the pressure gauge 10 being arranged on the injection line 5 downstream of the second non return valve 9 b.
Through setting up manometer 10, can measure the internal pressure of injection line 5, can in time master injection line 5 internal pressure, prevent that it from surpassing system's dry pressure.
The liquid preparation tank 3 is used for mixing the first polymer flooding solution and the polymer flooding solution, and in order to ensure that the first polymer flooding solution and the polymer flooding solution are fully and uniformly mixed, a first inlet and a second inlet of the liquid preparation tank 3 are both arranged at the top of the liquid preparation tank 3; the outlet of the dispensing tank 3 is arranged at the bottom of the dispensing tank 3 so as to provide sufficient mixing space for the first polymer flooding solution and the polymer flooding solution.
It will be appreciated that the first and second inlets described above are located adjacent the top of the dosage drum 3.
Further, based on the order of on-line preparation and on-line delivery of the second polymer flooding solution, it is preferable to dispose the connection of the injection line 1 and the injection trunk line Y downstream of the connection of the injection line 5 and the injection trunk line Y.
In the embodiment of the present invention, it is preferable that the injection distribution line 1 and the injection line 5 are flange-connected to the injection trunk line Y.
Through making injection allocation pipeline 1 and injection pipeline 5 and notes gather main Y flange joint, not only for the convenience maintain or the dismouting to this enrichment facility, can also dismantle the back with the device and carry out the enrichment operation to other notes gather well X, used repeatedly promptly, so can improve this enrichment facility's utilization ratio.
Specifically, a through hole is formed in the wall of the main injection trunk line Y, one flange is welded to the through hole, the other matched flange is welded to the pipe orifice of the injection allocation pipeline 1 or the pipe orifice of the injection allocation pipeline 5, and the two flanges are fastened together by using bolts, so that the flange connection of the injection allocation pipeline 1 and the injection allocation pipeline 5 to the main injection trunk line Y can be realized.
In a second aspect, an embodiment of the present invention provides an online concentration method for a polymer injection well X, where the method includes: the first control valve 7a is opened and a predetermined amount of the first polymer flooding solution from the polymer injection main line Y is fed to the dosing tank 3 through the dosing line 1 by means of the flow distributor 2, while a predetermined amount of the polymer flooding is added to the dosing tank 3 from the hopper 4.
And uniformly mixing the mother solution and the polymer flooding solution in the liquid preparation tank 3 to prepare a second polymer flooding solution, wherein the concentration of the second polymer flooding solution meets the concentration requirement of the polymer injection well X.
And (3) conveying the second polymer flooding solution into the polymer injection main line Y through an injection pipeline 5 by using a polymer injection pump 6, mixing the second polymer flooding solution with the first polymer flooding solution in the polymer injection main line Y to form a third polymer flooding solution, and injecting the third polymer flooding solution into the polymer injection well X to realize the concentration of the polymer injection well X.
The concentration method provided by the embodiment of the invention can be used for carrying out independent adaptive concentration operation on the single polymer injection well X, carrying out online concentration on the polymer injection well X on the premise of not stopping production of the polymer injection well X, and avoiding independent use of the prepared mother liquor by using the first polymer flooding solution as the prepared mother liquor, thereby simplifying the preparation process and saving raw materials.
Further, the method further comprises: while the polymer flooding solution flows through the injection line 5, the flow rate of the polymer flooding solution is detected by the flow meter 8 so that the second polymer flooding solution is injected into the injection trunk line Y at a desired injection rate.
Further, the method further comprises: the pressure gauge 10 is used to measure the internal pressure of the injection line 5 as the polymer flooding solution flows through the injection line 5, and to control the pressure in the injection line 5 to prevent it from exceeding the system dry pressure.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. An online concentration device for a polymer injection well, which is characterized by comprising: the device comprises a distributing and injecting pipeline (1), a flow distributor (2), a liquid distributing tank (3), a hopper (4), an injecting pipeline (5), a polymer injecting pump (6) and a first control valve (7 a);
the inlet of the injection allocation pipeline (1) is communicated with a polymer injection trunk line (Y) of a polymer injection well (X), and the outlet is communicated with a first inlet of the liquid allocation tank (3);
the hopper (4) is communicated with a second inlet of the liquid preparation tank (3);
the outlet of the liquid preparation tank (3) is communicated with the inlet of the injection pipeline (5), and the outlet of the injection pipeline (5) is communicated with the polymer injection trunk line (Y);
the injection pump (6) is arranged on the injection pipeline (5);
the flow distributor (2) and the first control valve (7a) are arranged on the dispensing line (1).
2. The apparatus of claim 1, further comprising: a second control valve (7 b);
the second control valve (7b) is arranged on the injection line (5) upstream of the injection pump (6).
3. The apparatus of claim 1, further comprising: a flow meter (8); the flow meter (8) is arranged on the injection line (5) and downstream of the injection pump (6).
4. The apparatus of claim 3, further comprising: a first check valve (9a) and a second check valve (9 b);
said first check valve (9a) being arranged on said dispensing line (1) downstream of said flow distributor (2);
the second check valve (9b) is arranged on the injection line (5) downstream of the flow meter (8).
5. The apparatus of claim 4, further comprising: a pressure gauge (10); the pressure gauge (10) is arranged on the injection line (5) and is located downstream of the second non-return valve (9 b).
6. The device according to claim 1, characterized in that the first inlet and the second inlet of the dosing tank (3) are both arranged at the top of the dosing tank (3);
the outlet of the liquid preparation tank (3) is arranged at the bottom of the liquid preparation tank (3).
7. Device according to claim 1, characterized in that the dispensing line (1) and the injection line (5) are both flanged to the injection trunk (Y).
8. An on-line concentration method for a polymer injection well, which is characterized by comprising the following steps: opening a first control valve (7a) and feeding a predetermined amount of a first polymer flooding solution coming from a polymer injection main line (Y) into a dosing tank (3) through a dosing line (1) by means of a flow distributor (2), while feeding a predetermined amount of polymer flooding into said dosing tank (3) from a hopper (4);
the first polymer flooding solution and the polymer flooding solution are uniformly mixed in the liquid preparation tank (3) to prepare a second polymer flooding solution, and the concentration of the second polymer flooding solution meets the concentration requirement of a polymer injection well (X);
the second polymer flooding solution is conveyed into the polymer injection trunk line (Y) through an injection pipeline (5) by using a polymer injection pump (6), and after being mixed with the first polymer flooding solution in the polymer injection trunk line (Y), the second polymer flooding solution forms a third polymer flooding solution and is injected into the polymer injection well (X), so that the concentration of the polymer injection well (X) is realized;
wherein the inlet of the injection allocation pipeline (1) is communicated with the polymer injection trunk line (Y) of the polymer injection well (X), and the outlet is communicated with the first inlet of the liquid allocation tank (3);
the hopper (4) is communicated with a second inlet of the liquid preparation tank (3);
the outlet of the liquid preparation tank (3) is communicated with the inlet of the injection pipeline (5), and the outlet of the injection pipeline (5) is communicated with the polymer injection trunk line (Y);
the injection pump (6) is arranged on the injection pipeline (5);
the flow distributor (2) and the first control valve (7a) are arranged on the dispensing line (1).
9. The method of claim 8, further comprising: detecting the flow rate of the second polymer flooding solution with a flow meter (8) while the second polymer flooding solution flows through the injection line (5).
10. The method according to claim 9, wherein the internal pressure of the injection line (5) is tested with a pressure gauge (10) while the second polymer flooding solution flows through the injection line (5).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710631248.1A CN109306858B (en) | 2017-07-28 | 2017-07-28 | Polymer injection well online concentration device and method |
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| CN201710631248.1A CN109306858B (en) | 2017-07-28 | 2017-07-28 | Polymer injection well online concentration device and method |
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| CN109306858B true CN109306858B (en) | 2021-01-29 |
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| CN113266325A (en) * | 2020-02-14 | 2021-08-17 | 中国石油天然气股份有限公司 | Polymer injection device and method |
| CN114575808A (en) * | 2020-12-02 | 2022-06-03 | 中国石油天然气股份有限公司 | Solution concentration adjusting device and method |
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