CN102590031B - Method for measuring critical molecular weight of fuel scavenge polymer for shearing in immediate vicinity of wellbore - Google Patents
Method for measuring critical molecular weight of fuel scavenge polymer for shearing in immediate vicinity of wellbore Download PDFInfo
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- CN102590031B CN102590031B CN201210041344.8A CN201210041344A CN102590031B CN 102590031 B CN102590031 B CN 102590031B CN 201210041344 A CN201210041344 A CN 201210041344A CN 102590031 B CN102590031 B CN 102590031B
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Abstract
The invention discloses a method for measuring the shearing critical molecular weight of a fuel scavenge polymer in the immediate vicinity of a wellbore, which comprises the following steps: (1) preparing the aqueous solution of fuel scavenge polymer, to be measured and marking as solution a0; (2) enabling the solution a0 to flow through a shearing analog device in the immediate vicinity of the wellbore to collect solution a1; (3) carrying out the step (2) again on the solution a1 to obtain solution a2; if the ratio of the intrinsic viscosity of the solution a2 to the intrinsic viscosity of the solution a1 is 85-110%, proving that the molecular weight of the fuel scavenge polymer in the solution a2 is the shearing critical molecular weight of the fuel scavenge polymer in the immediate vicinity of the wellbore; and if the ratio of the intrinsic viscosity of the solution a2 to the intrinsic viscosity of the solution a1 is less than 85%, repeating the step (2) until the ratio of the intrinsic viscosity of the solutions an and a(n-1) which successively flow through the shearing analog device twice is 85-110%, and then proving that the molecular weight of the fuel scavenge polymer in the solution an is the shearing critical molecular weight of the fuel scavenge polymer in the immediate vicinity of the wellbore.
Description
Technical field
The present invention relates to a kind of displacement of reservoir oil polymkeric substance of measuring in the method for the critical molecular weight of immediate vicinity of wellbore shearing.
Background technology
In field of petroleum exploitation, polymer flooding is an important raising recovery efficiency technique.This technology relates to water-soluble polymers (as partially hydrolyzed polyacrylamide) pressed powder and is dissolved in the water, and by high pressure line, at water injection well, injects oil reservoir, injects the viscosity of fluid by raising, improves mobility ratio.Polymer solution enters behind stratum, whether can reach the viscosity of expection, for the effect of the displacement of reservoir oil, has very important impact.
Near once well-sampling Injection Well of onshore oil field and offshore oilfield, obtain the character of polymer solution in stratum, find that polymer solution is at performance loss and the polymer type of immediate vicinity of wellbore, water quality, injection rate, the many factors such as formation temperature are relevant, because the factors such as water quality and formation temperature cannot change, can pass through preferred polymers type, optimize note polymerizing technology parameter to reduce displacement of reservoir oil polymkeric substance in the performance loss of immediate vicinity of wellbore, it is one of a lot of staff focus of paying close attention to and studying, but how preferred polymers is noted polymerizing technology parameter with optimization, lack the method and the foundation that are associated.
Summary of the invention
The object of this invention is to provide a kind of displacement of reservoir oil polymkeric substance of measuring in the method for the critical molecular weight of immediate vicinity of wellbore shearing.
A kind of displacement of reservoir oil polymkeric substance of measuring provided by the present invention, in the method for the critical molecular weight of immediate vicinity of wellbore shearing, comprises the steps:
(1) prepare the aqueous solution of displacement of reservoir oil polymkeric substance to be determined, be designated as solution a0;
(2) described solution a0 is flowed through with the cone barrel-shaped near borehole zone cutting simulation device of sand control compacting sand body, collect and obtain solution a1, measure the intrinsic viscosity of described solution a1;
Described immediate vicinity of wellbore shearing simulation device comprises the round table-like cylindrical shell being comprised of round platform cylindrical shell and the cylindrical tube that is arranged on described round platform cylindrical shell small-caliber end; Described round table-like cylindrical shell is provided with gland bonnet A and gland bonnet B; Described gland bonnet A is positioned at described cylindrical tube end, and described gland bonnet B is positioned at described round platform cylindrical shell end, is respectively equipped with sealed tube wire terminal a and sealed tube wire terminal b on described gland bonnet A and gland bonnet B; In described cylindrical tube, be provided with the circle ring column of interference fit with it; Between the lower surface of described circle ring column and described gland bonnet B, be provided with cementing sand body, in described cementing sand body, be provided with the cylindrical hole with the intracavity inter-connection of described circle ring column; In described cylindrical hole, be equipped with compacting sand body in the inner chamber of described circle ring column and between the upper surface of described circle ring column and described gland bonnet A;
(3) described solution a1 is repeated to above-mentioned steps (2) and obtain solution a2, the characteristic of measuring described solution a2 is sticky
If the ratio of the intrinsic viscosity of the intrinsic viscosity of described solution a2 and described solution a1 is 85%～110%, the molecular weight of the displacement of reservoir oil polymkeric substance in described solution a2 is the critical molecular weight that this displacement of reservoir oil polymkeric substance is sheared in immediate vicinity of wellbore;
If the ratio of the intrinsic viscosity of the intrinsic viscosity of described solution a2 and described solution a1 is less than 85%, repeat above-mentioned steps (2) until the ratio of the intrinsic viscosity of adjacent flow through for twice solution an after described shearing simulation device and a (n-1) is 85%～110%, the molecular weight of the displacement of reservoir oil polymkeric substance in described solution an is the critical molecular weight that this displacement of reservoir oil polymkeric substance is sheared in immediate vicinity of wellbore;
The solution of described solution n for flowing through after described shearing simulation device for the last time.
In above-mentioned method, described displacement of reservoir oil polymkeric substance can be hydrophobic associated polymer.
In above-mentioned method, described hydrophobic associated polymer specifically can be acrylamide copolymer.
In above-mentioned method, described acrylamide copolymer specifically can be plain polypropylene acid amides, super high molecular weight polyacrylamide, with the acrylamide copolymer of side chain or other functional groups, as AP-P4, MO4000, KPAM or HPAM etc.
A kind of displacement of reservoir oil polymkeric substance of measuring provided by the invention is in the method for the critical molecular weight of immediate vicinity of wellbore shearing, technique simply, is easily implemented and is controlled, by the method, can obtain the critical molecular weight that under different injection parameter conditions, polymer solution is sheared in immediate vicinity of wellbore, by understanding this polymkeric substance critical molecular weight that polymer solution is sheared in immediate vicinity of wellbore under different injection parameter conditions, can provide very important reference frame for intending the setting of the poly-oil field selective polymer type of note and on-the-spot note polymerizing technology parameter.
Accompanying drawing explanation
Fig. 1 is that the present invention measures displacement of reservoir oil polymkeric substance at the process chart of the method for the critical molecular weight of immediate vicinity of wellbore shearing.
Fig. 2 is the structural representation of immediate vicinity of wellbore shearing simulation device used in the embodiment of the present invention.
Fig. 3 is the pictorial diagram of immediate vicinity of wellbore shearing simulation device used in the embodiment of the present invention.
In figure, each mark is as follows: 1 sealed tube wire terminal a, 2 gland bonnet A, 3 compacting quartz sand bodies, 4 annulus cement columns, 5 cylindrical holes, 6 cementing quartz sand bodies, 7 round platform cylindrical shells, 8 sealed tube wire terminal b, 9 gland bonnet B, 10,11 cylindrical tubes, 12 sample taps, 13 gland bonnet C.
Embodiment
The experimental technique using in following embodiment if no special instructions, is conventional method.
In following embodiment, material used, reagent etc., if no special instructions, all can obtain from commercial channels.
Mou Zhuju oil field, Bohai Sea hydrophobic associated polymer is in the mensuration of immediate vicinity of wellbore critical molecular weight
Process chart is as shown in Figure 1: pump take certain flow (being 380ml/min in the present embodiment) by polymer solution by the polymer solution reservoir vessel cylinder-shaped immediate vicinity of wellbore of the round platform analogue means of flowing through, then flow into sampler barrel and collect, be convenient to sample and measure.
In this embodiment, the structural representation of immediate vicinity of wellbore shearing simulation device used as shown in Figure 2, pictorial diagram as shown in Figure 3, it comprises by round platform cylindrical shell 7 and is separately positioned on the round table-like cylindrical shell that the small-caliber end of round platform cylindrical shell 7 and the cylindrical tube 10 of heavy caliber end and cylindrical tube 11 form, for the seepage channel of radial variations is provided; Round table-like cylindrical shell is provided with gland bonnet A2 and gland bonnet B9, for round table-like cylindrical shell is played to sealing process; Gland bonnet A2 and gland bonnet B9 make by stainless steel; Gland bonnet A2 and gland bonnet B9 are all tightly connected by screw thread and round table-like cylindrical shell; Gland bonnet A2 is provided with sealed tube wire terminal a1, and gland bonnet A2 is connected by thread seal with sealed tube wire terminal a1, for being closely connected to provide flow passage with indoor displacement pipeline; Gland bonnet B9 is provided with sealed tube wire terminal b8, and gland bonnet B9 is connected by thread seal with sealed tube wire terminal b8, for being closely connected to provide flow passage with indoor displacement pipeline; Round table-like cylindrical shell is provided with 3 sample taps 12, in needs, can be communicated with round table-like cylindrical shell extraneous, thereby obtain working fluid, carries out performance test; Sample tap 12 is provided with gland bonnet C13, obsolete time, can seal with gland bonnet C13 the passage of sample tap 12; In cylindrical tube 10, be provided with the annulus cement column 4 with cylindrical tube 10 interference fit, the lower surface of annulus cement column 4 and round platform cylindrical shell 7 overlap with the interface of cylindrical tube 10; In round platform cylindrical shell 7, be provided with cementing quartz sand body 6, the permeability of cementing quartz sand body 6 is that 40～60 darcies, factor of porosity are 0.37; In cementing quartz sand body 6, be provided with the cylindrical hole 5 with the intracavity inter-connection of annulus cement column 4, be used for analogue perforation borehole, the diameter of cylindrical hole 5 equates with the interior ring diameter of annulus cement column 4, and the height of cylindrical hole 5 is less than the height of cementing quartz sand body 6; In cylindrical hole 5, be provided with compacting quartz sand body 3 in the inner chamber of annulus cement column 4, the permeability of compacting quartz sand body 3 is 1.5 darcies, and factor of porosity is 0.29.
At oil field, Bohai Sea injection well, implement hydrophobic associated polymer oil displacement test, the implantation concentration of this hydrophobic associated polymer AP-P4 is 1750mg/L, and diurnal injection is 800m
3, core intersection is 40m, average injection index is 20m
3/ d, employing 95/8 " well-cased perforating mode completion adopts 5 " cutting seam sieve tube gravpack technology sand control, shot density is every meter of 39 holes, and perforation diameter is 20.07mm, and hole depth is 198.15mm; The factor of porosity of gravel packing zone is 0.37, permeability 40～60 darcies, the factor of porosity 0.29 on stratum, immediate vicinity of wellbore, permeability approximately 1.5 darcies, rely on above-mentioned parameter to make the cylinder-shaped immediate vicinity of wellbore of the round platform analogue means with sand control compacting sand body, its pictorial diagram as shown in Figure 3.
Compound concentration is the hydrophobic associated polymer AP-P4 aqueous solution a0 of 1750mg/L, and its intrinsic viscosity is 1925.3ml/g; Make the solution a0 shearing simulation device of immediate vicinity of wellbore shown in Fig. 3 of flowing through, collect and obtain solution a1, recording its intrinsic viscosity is 1245.5ml/g, and the ratio of the intrinsic viscosity of solution a1 and solution a0 (being intrinsic viscosity retention rate) is 64.7%; Make the solution a1 shearing simulation device of immediate vicinity of wellbore shown in Fig. 3 of flowing through, collect and obtain solution a2, recording its intrinsic viscosity is 1206.8ml/g, and the intrinsic viscosity ratio of solution a2 and solution a1 is 96.39%; Make the solution a2 shearing simulation device of immediate vicinity of wellbore shown in Fig. 3 of again flowing through, collect and obtain solution a3, recording its intrinsic viscosity is 1220.9ml/g, and the intrinsic viscosity ratio of solution a3 and solution a2 is 101.1%; Specific experiment result is as shown in table 1.
In the present embodiment, the assay method of the intrinsic viscosity of solution is one point method described in GB12005.1 polyacrylamide For Intrinsic Viscosity Measurements method.
The experimental result of table 1 hydrophobic association polymer solution before and after the analogue means of immediate vicinity of wellbore
The intrinsic viscosity of this polymer flow that comparison sheet 1 obtains after the different number of times of analogue means, thus this oil field obtained at injection technology parameter 20m
3during/d, the critical molecular weight of hydrophobic associated polymer in immediate vicinity of wellbore is the molecular weight of the corresponding polymkeric substance of solution a3.
Claims (3)
1. measure displacement of reservoir oil polymkeric substance in a method for the critical molecular weight of immediate vicinity of wellbore shearing, comprise the steps:
(1) prepare the aqueous solution of displacement of reservoir oil polymkeric substance to be determined, be designated as solution a0;
(2) described solution a0 is flowed through with the cone barrel-shaped near borehole zone cutting simulation device of sand control compacting sand body, collect and obtain solution a1, measure the intrinsic viscosity of described solution a1;
Described immediate vicinity of wellbore shearing simulation device comprises the round table-like cylindrical shell being comprised of round platform cylindrical shell and the cylindrical tube that is arranged on described round platform cylindrical shell small-caliber end; Described round table-like cylindrical shell is provided with gland bonnet A and gland bonnet B; Described gland bonnet A is positioned at described cylindrical tube end, and described gland bonnet B is positioned at described round platform cylindrical shell end, is respectively equipped with sealed tube wire terminal a and sealed tube wire terminal b on described gland bonnet A and gland bonnet B; In described cylindrical tube, be provided with the circle ring column of interference fit with it; Between the lower surface of described circle ring column and described gland bonnet B, be provided with cementing sand body, in described cementing sand body, be provided with the cylindrical hole with the intracavity inter-connection of described circle ring column; In described cylindrical hole, be equipped with compacting sand body in the inner chamber of described circle ring column and between the upper surface of described circle ring column and described gland bonnet A;
(3) described solution a1 is repeated to above-mentioned steps (2) and obtain solution a2, measure the intrinsic viscosity of described solution a2;
If the ratio of the intrinsic viscosity of the intrinsic viscosity of described solution a2 and described solution a1 is 85%～110%, the molecular weight of the displacement of reservoir oil polymkeric substance in described solution a2 is the critical molecular weight that this displacement of reservoir oil polymkeric substance is sheared in immediate vicinity of wellbore;
If the ratio of the intrinsic viscosity of the intrinsic viscosity of described solution a2 and described solution a1 is less than 85%, repeat above-mentioned steps (2) until adjacent solution an and the a(n-1 flowing through for twice after described shearing simulation device) the ratio of intrinsic viscosity be 85%～110%, the molecular weight of the displacement of reservoir oil polymkeric substance in described solution an is the critical molecular weight that this displacement of reservoir oil polymkeric substance is sheared in immediate vicinity of wellbore;
The solution of described solution an for flowing through after described shearing simulation device for the last time.
2. method according to claim 1, is characterized in that: described displacement of reservoir oil polymkeric substance is hydrophobic associated polymer.
3. method according to claim 2, is characterized in that: described hydrophobic associated polymer is polyacrylamide polymer.
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| CN104777273B (en) * | 2015-04-20 | 2017-03-22 | 西南石油大学 | Third-order shear method for determining performance parameter of polymer solution for oil displacement |
| CN105044293B (en) * | 2015-08-18 | 2016-07-13 | 东北石油大学 | Polymer becomes sticky injection device and use this device to carry out becoming sticky the method for experiment |
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| CN1128350A (en) * | 1995-01-03 | 1996-08-07 | 中国科学院化学研究所 | Compound salt system for determination of water-soluble superpolymer molecular weight |
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| CN102052071A (en) * | 2010-12-14 | 2011-05-11 | 中国海洋石油总公司 | Frustum cylinder-shaped near wellbore zone shear simulation device with sand prevention compacted sand bodies |
| CN102116149A (en) * | 2010-12-14 | 2011-07-06 | 中国海洋石油总公司 | Round-table-barrel-shaped near-well-bore shear simulating device with three layers of compaction sand bodies |
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| CN1128350A (en) * | 1995-01-03 | 1996-08-07 | 中国科学院化学研究所 | Compound salt system for determination of water-soluble superpolymer molecular weight |
| CN101458246A (en) * | 2009-01-08 | 2009-06-17 | 浙江大学 | Method for measuring molecular weight distribution of linear polymer |
| CN102052071A (en) * | 2010-12-14 | 2011-05-11 | 中国海洋石油总公司 | Frustum cylinder-shaped near wellbore zone shear simulation device with sand prevention compacted sand bodies |
| CN102116149A (en) * | 2010-12-14 | 2011-07-06 | 中国海洋石油总公司 | Round-table-barrel-shaped near-well-bore shear simulating device with three layers of compaction sand bodies |
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| 高聚物熔体粘度与分子量的关系;徐爱德等;《高分子材料科学与工程》;19940131(第1期);137-139 * |
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Address after: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Co-patentee after: CNOOC research institute limited liability company Patentee after: China Offshore Oil Group Co., Ltd. Address before: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Co-patentee before: CNOOC Research Institute Patentee before: China National Offshore Oil Corporation |