CN101787864B - Water plugging method for fractured water-flooded oil well for water injection development of oil reservoir in low-permeability reservoir - Google Patents
Water plugging method for fractured water-flooded oil well for water injection development of oil reservoir in low-permeability reservoir Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 63
- 238000002347 injection Methods 0.000 title claims abstract description 60
- 239000007924 injection Substances 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 43
- 239000003129 oil well Substances 0.000 title claims abstract description 22
- 238000011161 development Methods 0.000 title abstract description 4
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 15
- 239000002981 blocking agent Substances 0.000 claims description 111
- 239000007864 aqueous solution Substances 0.000 claims description 35
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims description 33
- 229920002239 polyacrylonitrile Polymers 0.000 claims description 30
- 238000002360 preparation method Methods 0.000 claims description 30
- 238000005516 engineering process Methods 0.000 claims description 28
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 27
- 230000035699 permeability Effects 0.000 claims description 27
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 20
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 20
- 229920002472 Starch Polymers 0.000 claims description 14
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 claims description 14
- 235000019698 starch Nutrition 0.000 claims description 14
- 239000008107 starch Substances 0.000 claims description 14
- 241000237858 Gastropoda Species 0.000 claims description 13
- 238000010276 construction Methods 0.000 claims description 13
- 230000002209 hydrophobic effect Effects 0.000 claims description 13
- 229920002401 polyacrylamide Polymers 0.000 claims description 13
- 239000000047 product Substances 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 11
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- 229920000647 polyepoxide Polymers 0.000 claims description 10
- 235000006408 oxalic acid Nutrition 0.000 claims description 9
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 7
- 239000004312 hexamethylene tetramine Substances 0.000 claims description 7
- 235000010299 hexamethylene tetramine Nutrition 0.000 claims description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- 239000004698 Polyethylene Substances 0.000 claims description 6
- 150000001875 compounds Chemical class 0.000 claims description 6
- 238000001802 infusion Methods 0.000 claims description 6
- -1 polyethylene Polymers 0.000 claims description 6
- 229920000573 polyethylene Polymers 0.000 claims description 6
- 239000000243 solution Substances 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 239000013078 crystal Substances 0.000 claims description 3
- 125000003700 epoxy group Chemical group 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- 239000012467 final product Substances 0.000 claims description 3
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 claims description 3
- 239000012286 potassium permanganate Substances 0.000 claims description 3
- 238000004448 titration Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 6
- 238000011084 recovery Methods 0.000 abstract description 5
- 238000003825 pressing Methods 0.000 abstract description 4
- 230000000087 stabilizing effect Effects 0.000 abstract 2
- 239000004568 cement Substances 0.000 abstract 1
- 238000005086 pumping Methods 0.000 abstract 1
- 238000007789 sealing Methods 0.000 abstract 1
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
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Abstract
The invention discloses a water plugging method for a fractured water-flooded oil well of a water injection development reservoir of a low-permeability reservoir, which relates to the technical field of a transformation process for controlling water, stabilizing oil and increasing yield of the oil well in the oil exploitation process, and comprises the following steps: 1) four kinds of plugging agents DQ-1, DQ-2, LDN-1 and LDN-2 with different strengths are prepared on site; 2) continuously pressing the plugging agents DQ-1 and DQ-2 prepared in the step 1) into natural microcracks of the stratum by using an alternative injection process; 3) pressing the plugging agent LDN-1 prepared in the step 1) into natural cracks and artificial cracks of a stratum; 4) pressing the plugging agent LDN-2 prepared in the step 1) into an artificial crack for sealing; the use temperature of the four plugging agents is 0-75 ℃; the concentration of the four plugging agents is 0.5-5%; the pumping pressure of the cement truck or the fracturing truck is less than 30 MPa. The invention can effectively realize the technical effects of increasing and stabilizing the yield of the low-permeability fractured reservoir and improving the oil layer recovery ratio, and can also realize the effective plugging of natural fractures and artificial fractures.
Description
Technical field
The present invention relates in the oil exploitation process oil well be carried out the reforming technology technical field of water and oil control volume increase, exactly relate to a kind of low permeability reservoir waterflooding reservoir Fractured water cut oil shutoff method.
Background technology
In the low permeability fractured oilfield development process, because the impact of formation fracture (natural microcrack and artificial fracture) is developed and be subjected to long-term injecting water, the non-homogeneity on stratum is unusually serious, make injected water often ooze flow in fracture along height, and involve less permeable layer less than oil-containing, the water filling of this poor efficiency not only affects the crude oil recovery percent of reserves, and owing to the consumption of the energy, the processing of production fluid, the corrosion of pipeline etc. have increased the cost that recovers the oil.
Conventional water-plugging technology generally is to adopt single injection technology to inject from oil well single blocking agent slug, then closing well Hou Ning.
Being that the Chinese patent literature of CN101476452A discloses a kind of water-control fracturing yield increasing method for oil gas well such as publication number, is a kind of take the jelly system of meeting the automatic viscosity reduction of end water as fracturing fluid and cover sand take wax and split technology as the control hydraulic pressure of part proppant specifically.At present when the hyposmosis bottom water reservoir being carried out the fracturing construction, because inter-laminar stress difference is little or just do not have interlayer to form inter-laminar stress difference at all, effectively stop the extension expansion of crack on vertical, the crack that causes fracturing to form extends into the bottom water layer and enters pit shaft along channelling on the crack vertical, causes the sudden and violent property water logging of oil well.The present invention adopts when pressing crack construction, carries coated proppant that paraffin and quartz sand is mixed into by thickening agent and crosslinking agent and coats and stop up at the underground chemical degradation that carries out, and forms plugged zone.It has effectively solved existing manual shielding layer and can not effectively avoid the problem of waterflood and adopt the fracturing fluid that carries diversion agent or diverting agent to meet water base not viscosity reduction and the slower problem of settling rate.
Such water-plugging technology is unsuitable for the shutoff of all low permeability fractured oil reservoirs of buried depth 800m-2500m on the one hand, on the other hand, the sweep area of blocking agent shutoff is few, period of validity is short, also on the one hand, the measure of shutoff is single, and correctional effect is not good, can't realize the effective shutoff to intrinsic fracture and man-made fracture.
Summary of the invention
For solving the problems of the technologies described above, the present invention proposes a kind of shutoff method that is suitable for all low permeability fractured oil reservoirs of buried depth 800m-2500m, use the present invention and can effectively realize low permeability fractured reservoir stimulation, stable yields, improve the technique effect of reservoir recovery, and can also realize the effective shutoff to intrinsic fracture and man-made fracture.
The present invention is by adopting following technical proposals to realize:
A kind of low permeability reservoir waterflooding reservoir Fractured water logging oil well shutoff method is characterized in that step is as follows:
1) four kinds of different blocking agent DQ-1, DQ-2, LDN-1 and LDN-2 of on-the-spot preparation strength:
The preparation method of described DQ-1 blocking agent is: polyacrylonitrile, formaldehyde and water are uniformly mixed to form the aqueous solution according to 5: 2: 93 mass ratio, and this aqueous solution is DQ-1 blocking agent finished product;
Wherein, polyacrylonitrile and formaldehyde shared mass percent in the aqueous solution is respectively 5% and 2%, (for example: polyacrylonitrile 5g, formaldehyde 2g, water 93g)
The preparation method of described DQ-2 blocking agent is: with hydrophobic association polyacrylamide, formaldehyde, phenol and water according to 0.3: 2: 1: 96.7 mass ratio is uniformly mixed to form the aqueous solution, and this aqueous solution is DQ-2 blocking agent finished product;
Wherein, hydrophobic association polyacrylamide, formaldehyde and phenol shared mass percent in the aqueous solution is respectively 0.3%, 2% and 1%, (for example: hydrophobic association polyacrylamide 0.3g, formaldehyde 2g, phenol 1g, water 96.7g)
The preparation method of described LDN-1 blocking agent is: starch conversion polyacrylonitrile, polyethylene alcohol and water are uniformly mixed to form the aqueous solution according to 3: 0.2: 96.8 mass ratio, and this aqueous solution is LDN-1 blocking agent finished product;
Wherein, starch conversion is poly-is respectively 3% and 0.2% with polyvinyl alcohol shared mass percent in the aqueous solution.(for example: starch conversion polyacrylonitrile 3g, polyvinyl alcohol 0.2g, water 96.8g)
The starch conversion polyacrylonitrile is starch/modified polyacrylonitrile fiber dimension.
The concrete grammar of described LDN-2 blocking agent is: with epoxy resin, hexamethylenetetramine, polyethylene alcohol and water according to 3: 2: 0.2: 94.8 mass ratio is uniformly mixed to form the aqueous solution, and this aqueous solution is LDN-2 blocking agent finished product;
Wherein, epoxy resin, hexamethylenetetramine and polyvinyl alcohol shared mass percent 3%, 2% and 0.2% in the aqueous solution.(for example: epoxy resin 3g, hexamethylenetetramine 2g, polyvinyl alcohol 0.2g, water 94.8g)
Epoxy resin is the organic high molecular compound that contains two or more epoxide groups in the general reference molecule.
2) with step 1) in the blocking agent DQ-1 of preparation and DQ-2 adopt alternately injection technology to compress into continuously the natural microcrack on stratum with cementing truck or fracturing unit truck, finish the first slug that three grades of slugs inject; Specifically DQ-1 and DQ-2 are clamp-oned in the natural microcrack in stratum with the discharge capacity of 50-500L/min with cementing truck or fracturing unit truck, two kinds of blocking agent injection rates are aggregated in 30-200m
3Scope;
3) with step 1) in the blocking agent LDN-1 of preparation compress into intrinsic fracture and the man-made fracture on stratum with cementing truck or fracturing unit truck, finish the second slug that three grades of slugs inject; Specifically LDN-1 is clamp-oned in stratum intrinsic fracture and the man-made fracture with the discharge capacity of 50-500L/min with cementing truck or fracturing unit truck, injection rate is at 10-30m
3Scope;
4) with step 1) in the blocking agent LDN-2 of preparation compress into man-made fracture with cementing truck or fracturing unit truck and seal, finish the 3rd slug that three grades of slugs inject; Specifically LDN-2 is clamp-oned in the man-made fracture with the discharge capacity of 50-500L/min with cementing truck or fracturing unit truck, injection rate is at 8-15m
3Scope;
The serviceability temperature of four kinds of blocking agents is 0 ℃-75 ℃; The concentration of four kinds of blocking agents is 0.5-5%; The infusion pressure of cementing truck or fracturing unit truck is less than 30MPa, and four kinds of blocking agents are injected continuously, the infusion time continuously every.
The meaning of the first slug recited above, the second slug, the 3rd slug refers to: the liquid plugging agent that whole plug water construction injects the stratum is divided into three parts, the first slug refers to step 2 exactly) inject DQ-1 and the DQ-2 on stratum, two kinds of blocking agent injection rates are aggregated in 30-200m
3Scope; The second slug refers to step 3 exactly) inject the LDN-1 on stratum, injection rate is at 10-30m
3Scope; The 3rd slug just refers to step 4) inject the LDN-2 on stratum, injection rate is at 8-15m
3Scope.
In step 3) with 4) in add the initator that makes LDN-1 become glue with LDN-2, addition manner adopts artificial mode of slowly appending, addition with respect to LDN-1 blocking agent and LDN-2 blocking agent all in the scope of 0.2%-0.4% mass percent.
Described initator is that concentration is 0.03% oxalic acid solution.Come the mode of titration to measure its concentration with potassium permanganate, compound method is as follows: claim 0.3g oxalic acid crystal, be fed in the aqueous solution of 1000ml, namely get concentration and be 0.03% oxalic acid solution.
Described alternately injection technology specifically refers to: with cementing truck or fracturing unit truck selective different with the viscosity two kinds of gel rubber system DQ-1 of profit and DQ-2 are alternately clamp-oned the stratum continuously, described continuously alternately for injecting first DQ-1, DQ-2 reinjects, and then injection DQ-1, until two kinds of blocking agents are all injected, injection period improves constantly the blocking agent injection pressure, and maximum pressure is no more than 30MPa and gets final product.
Step 1) the required polyacrylonitrile of preparation DQ-1 blocking agent is that molecular weight is 3,000,000-5,000,000 polyacrylonitrile in, and the LDN-1 blocking agent viscosity for preparing is 30-100mPas.
Step 1) the required hydrophobic association polyacrylamide of preparation DQ-2 blocking agent is that molecular weight is 5,000,000-1,000 ten thousand hydrophobic association polyacrylamide in, and the viscosity of the DQ-2 blocking agent for preparing is 50-100mPas.
Step 1) the required polyacrylonitrile of preparation LDN-1 blocking agent is that molecular weight is 5,000,000-1,000 ten thousand polyacrylonitrile in, and required polyvinyl alcohol is that molecular weight is 3,000,000-5,000,000 polyvinyl alcohol, and the viscosity of the LDN-1 blocking agent for preparing is 30-50mPas.
Step 1) the required polyvinyl alcohol of preparation LDN-2 blocking agent is that molecular weight is 3,000,000-5,000,000 polyvinyl alcohol in, and the viscosity of the LDN-2 blocking agent for preparing is 30-50mPas.
Be that the CN101476452A patent documentation is that the prior art of representative is compared with publication number, the technique effect that the present invention reaches shows:
One, on the one hand, adopt alternately injection technology to compress into the microcrack on stratum with cementing truck or fracturing unit truck DQ-1 and DQ-2 because the present invention adopts, rely on the selective and viscosity differences of these two kinds of blocking agents, effectively improved the shutoff sweep area of blocking agent.On the other hand, the present invention adopts four kinds of blocking agent synergies to carry out the oilwell water shutoff construction, be particularly suited for the water blockoff of all low permeability fractured oil reservoirs of buried depth 800m-2500m, use the method and can effectively realize low permeability fractured reservoir stimulation, stable yields, improve the technique effect of reservoir recovery.Again on the one hand, the present invention is by three grades of slug injection technologies, and dependence viscosity, four kinds of blocking agent slugs that intensity is different can carry out effective shutoff to Fracture with low permeability reservoir matrix microcrack, intrinsic fracture and man-made fracture, have improved to be constructed into power.
Two, the present invention is at more than 40 mouthfuls of wells of long celebrating field use, and is efficient greater than 70%, and the individual well moisture content 100% is reduced to 67.2% before by water blockoff, and the 0.17t/d of oil output per well before by water blockoff increases to 0.60t/d.This invention is transformed for the low permeability fractured oil field brings in a well and old well repeats to transform and started a new water-plugging technique, to the low permeability fractured oil field development improve recovery ratio, increasing economic efficiency provides sound assurance.
The specific embodiment
The present invention is described in further detail below in conjunction with the specific embodiment
Embodiment 1
The invention discloses a kind of low permeability reservoir waterflooding reservoir Fractured water logging oil well shutoff method, its step is as follows:
1) four kinds of different blocking agent DQ-1, DQ-2, LDN-1 and LDN-2 of on-the-spot preparation strength:
The preparation method of described DQ-1 blocking agent is: polyacrylonitrile, formaldehyde and water are uniformly mixed to form the aqueous solution according to 5: 2: 93 mass ratio, and this aqueous solution is DQ-1 blocking agent finished product; Wherein, polyacrylonitrile and formaldehyde shared mass percent in the aqueous solution is respectively 5% and 2%, (for example: polyacrylonitrile 5g, formaldehyde 2g, water 93g)
The preparation method of described DQ-2 blocking agent is: with hydrophobic association polyacrylamide, formaldehyde, phenol and water according to 0.3: 2: 1: 96.7 mass ratio is uniformly mixed to form the aqueous solution, and this aqueous solution is DQ-2 blocking agent finished product; Wherein, hydrophobic association polyacrylamide, formaldehyde and phenol shared mass percent in the aqueous solution is respectively 0.3%, 2% and 1%, (for example: hydrophobic association polyacrylamide 0.3g, formaldehyde 2g, phenol 1g, water 96.7g)
The preparation method of described LDN-1 blocking agent is: starch conversion polyacrylonitrile, polyethylene alcohol and water are uniformly mixed to form the aqueous solution according to 3: 0.2: 96.8 mass ratio, and this aqueous solution is LDN-1 blocking agent finished product; Wherein, starch conversion is poly-is respectively 3% and 0.2% with polyvinyl alcohol shared mass percent in the aqueous solution.(for example: starch conversion polyacrylonitrile 3g, polyvinyl alcohol 0.2g, water 96.8g) starch conversion polyacrylonitrile is starch/modified polyacrylonitrile fiber dimension.
The concrete grammar of described LDN-2 blocking agent is: with epoxy resin, hexamethylenetetramine, polyethylene alcohol and water according to 3: 2: 0.2: 94.8 mass ratio is uniformly mixed to form the aqueous solution, and this aqueous solution is LDN-2 blocking agent finished product; Wherein, epoxy resin, hexamethylenetetramine and polyvinyl alcohol shared mass percent 3%, 2% and 0.2% in the aqueous solution.(for example: epoxy resin 3g, hexamethylenetetramine 2g, polyvinyl alcohol 0.2g, water 94.8g) epoxy resin is the organic high molecular compound that contains two or more epoxide groups in the general reference molecule.
2) with step 1) in the blocking agent DQ-1 of preparation and DQ-2 adopt alternately injection technology to compress into continuously the natural microcrack on stratum with cementing truck or fracturing unit truck, finish the first slug that three grades of slugs inject; Specifically DQ-1 and DQ-2 are clamp-oned in the natural microcrack in stratum with the discharge capacity of 50-500L/min with cementing truck or fracturing unit truck, two kinds of blocking agent injection rates are aggregated in 30-200m
3Scope;
3) with step 1) in the blocking agent LDN-1 of preparation compress into intrinsic fracture and the man-made fracture on stratum with cementing truck or fracturing unit truck, finish the second slug that three grades of slugs inject; Specifically LDN-1 is clamp-oned in stratum intrinsic fracture and the man-made fracture with the discharge capacity of 50-500L/min with cementing truck or fracturing unit truck, injection rate is at 10-30m
3Scope;
4) with step 1) in the blocking agent LDN-2 of preparation compress into man-made fracture with cementing truck or fracturing unit truck and seal, finish the 3rd slug that three grades of slugs inject; Specifically LDN-2 is clamp-oned in the man-made fracture with the discharge capacity of 50-500L/min with cementing truck or fracturing unit truck, injection rate is at 8-15m
3Scope;
The serviceability temperature of four kinds of blocking agents is 0 ℃-75 ℃; The concentration of four kinds of blocking agents is 0.5-5%; The infusion pressure of cementing truck or fracturing unit truck is less than 30MPa, and four kinds of blocking agents are injected continuously, the infusion time continuously every.
The meaning of the first slug recited above, the second slug, the 3rd slug refers to: the liquid plugging agent that whole plug water construction injects the stratum is divided into three parts, the first slug refers to step 2 exactly) inject DQ-1 and the DQ-2 on stratum, two kinds of blocking agent injection rates are aggregated in 30-200m
3Scope; The second slug refers to step 3 exactly) inject the LDN-1 on stratum, injection rate is at 10-30m
3Scope; The 3rd slug just refers to step 4) inject the LDN-2 on stratum, injection rate is at 8-15m
3Scope.In step 3) with 4) in add the initator that makes LDN-1 become glue with LDN-2, addition manner adopts artificial mode of slowly appending, addition with respect to LDN-1 blocking agent and LDN-2 blocking agent all in the scope of 0.2%-0.4% mass percent.Described initator is that concentration is 0.03% oxalic acid solution.Come the mode of titration to measure its concentration with potassium permanganate, compound method is as follows: claim 0.3g oxalic acid crystal, be fed in the aqueous solution of 1000ml, namely get concentration and be 0.03% oxalic acid solution.Described alternately injection technology specifically refers to; With cementing truck or fracturing unit truck selective different with the viscosity two kinds of gel rubber system DQ-1 of profit and DQ-2 are alternately clamp-oned the stratum continuously, described continuously alternately for injecting first DQ-1, DQ-2 reinjects, and then injection DQ-1, until two kinds of blocking agents are all injected, injection period improves constantly the blocking agent injection pressure, and maximum pressure is no more than 30MPa and gets final product.Step 1) the required polyacrylonitrile of preparation DQ-1 blocking agent is that molecular weight is 3,000,000-5,000,000 polyacrylonitrile in, and the LDN-1 blocking agent viscosity for preparing is 30-100mPas.Step 1) the required hydrophobic association polyacrylamide of preparation DQ-2 blocking agent is that molecular weight is 5,000,000-1,000 ten thousand hydrophobic association polyacrylamide in, and the viscosity of the DQ-2 blocking agent for preparing is 50-100mPas.Step 1) the required polyacrylonitrile of preparation LDN-1 blocking agent is that molecular weight is 5,000,000-1,000 ten thousand polyacrylonitrile in, and required polyvinyl alcohol is that molecular weight is 3,000,000-5,000,000 polyvinyl alcohol, and the viscosity of the LDN-1 blocking agent for preparing is 30-50mPas.Step 1) the required polyvinyl alcohol of preparation LDN-2 blocking agent is that molecular weight is 3,000,000-5,000,000 polyvinyl alcohol in, and the viscosity of the LDN-2 blocking agent for preparing is 30-50mPas.
Embodiment 2
The present invention has carried out the innovation aspect two on the basis of conventional water blockoff.
Replace injection technique
By the alternately injection technology of DQ-1 and DQ-2, rely on the shutoff sweep area of the selective and viscosity differences Effective Raise blocking agent of two kinds of blocking agents.
The technique contrast
| Technology | Conventional water-plugging technique | Replace injection technique |
| Operation | Adopt single blocking agent single injection technology to inject oil well, closing well Hou Ning during construction. | Adopt the alternately injection technology of composite plugging agent, continual raising blocking agent injection pressure. |
| Advantage | Routine techniques is used ripe. | The shutoff sweep area of Effective Raise blocking agent is extended the expiration date. |
| Shortcoming | The sweep area of blocking agent shutoff is few, and period of validity is short | Belong to new technology, use immature. |
Three grades of slug injection techniques
By three grades of slug injection technologies, four kinds of different proprietary blocking agent slugs of dependence intensity can carry out effective shutoff to Fracture with low permeability reservoir matrix microcrack and artificial fracturing crack, have improved to be constructed into power.
The technique contrast
| Technology | Conventional water-plugging technique | Three grades of injection techniques |
| Operation | Adopt single blocking agent single injection technology to inject oil well, closing well Hou Ning during construction. | In conjunction with alternately injecting and three grades of injection technologies, adopt the realization of composite plugging agent slug to effective shutoff in matrix microcrack and artificial fracturing crack. |
| Advantage | Belong to conventional art, use ripe, workable. | The performance advantage that integrates multiple blocking agent, Effective Raise the measure success rate. |
| Shortcoming | The measure blocking agent is single, and correctional effect is limited. | Belong to new technology, use immature. |
The field exemplifies:
2008-2009, different well sites are adopted and are alternately injected and three grades of injection combined process construction 3 mouthfuls of wells (X-1, X-2, X-3) in certain oil field, be Fractured water logging oil well before the measure, on average after the measure moisturely be down to 63.3% by 98.8%, on average producing crude oil daily increases 1.5m
3, measure is efficient to reach 100%, has shown stronger technical advantage.
The measure effect statistical form
| Block | Order | Pound sign | The condition of production before the measure | The present condition of production | Level change | Oil increases day by day | Tired at present |
By three grades of slug injection process techniques, inject four kinds of different proprietary blocking agent slugs of intensity, realize by as far as closely low permeability reservoir matrix microcrack and artificial fracturing crack being carried out selective shut-off; Replace injection technology by changing blocking agent viscosity, in blocking agent shutoff crack, continual raising blocking agent injection pressure improves the sweep area in blocking agent shutoff crack, improves plugging effect; Replace the man-made fracture that technique is reserved certain-length by crossing, be used for recovering the oil after the measure.
The different proprietary selective water shutoff agent of four kinds of intensity that construction is adopted is formulated as liquid state before these four kinds of water shutoff agent constructions, forms respectively gel, frozen glue and high strong solid behind the closing well certain hour of injection stratum.
During the construction of low permeability fractured Water in Water Shutoff in Oil Field, adopt the blocking agent of the different indexs of viscosity to replace injection technology, in blocking agent shutoff crack, continual raising blocking agent injection pressure improves the sweep area in blocking agent shutoff crack.
During the construction of low permeability fractured Water in Water Shutoff in Oil Field, adopt three grades of slug injection technologies, can realize the effective shutoff to matrix microcrack and artificial fracture.Design locations laid respectively at after these three grades of slugs injected: (by as far as near) microcrack-microcrack and man-made fracture top-and away from the part man-made fracture of pit shaft.
Claims (10)
1. low permeability reservoir waterflooding reservoir Fractured water logging oil well shutoff method is characterized in that step is as follows:
1) four kinds of different blocking agent DQ-1, DQ-2, LDN-1 and LDN-2 of on-the-spot preparation strength:
The preparation method of described DQ-1 blocking agent is: polyacrylonitrile, formaldehyde and water are uniformly mixed to form the aqueous solution according to the mass ratio of 5:2:93, and this aqueous solution is DQ-1 blocking agent finished product;
The preparation method of described DQ-2 blocking agent is: hydrophobic association polyacrylamide, formaldehyde, phenol and water are uniformly mixed to form the aqueous solution according to the mass ratio of 0.3:2:1:96.7, and this aqueous solution is DQ-2 blocking agent finished product;
The preparation method of described LDN-1 blocking agent is: starch conversion polyacrylonitrile, polyethylene alcohol and water are uniformly mixed to form the aqueous solution according to the mass ratio of 3:0.2:96.8, and this aqueous solution is LDN-1 blocking agent finished product;
The concrete grammar of described LDN-2 blocking agent is: epoxy resin, hexamethylenetetramine, polyethylene alcohol and water are uniformly mixed to form the aqueous solution according to the mass ratio of 3:2:0.2:94.8, and this aqueous solution is LDN-2 blocking agent finished product;
2) adopt alternately injection technology to compress into continuously the natural microcrack on stratum with cementing truck or fracturing unit truck the blocking agent DQ-1 for preparing in the step 1) and DQ-2, finish the first slug that three grades of slugs inject; Specifically DQ-1 and DQ-2 are clamp-oned in the natural microcrack in stratum with the discharge capacity of 50-500L/min with cementing truck or fracturing unit truck, two kinds of blocking agent injection rates are aggregated in 30-200m
3Scope;
3) the blocking agent LDN-1 for preparing in the step 1) is compressed into intrinsic fracture and the man-made fracture on stratum with cementing truck or fracturing unit truck, finish the second slug that three grades of slugs inject; Specifically LDN-1 is clamp-oned in stratum intrinsic fracture and the man-made fracture with the discharge capacity of 50-500L/min with cementing truck or fracturing unit truck, injection rate is at 10-30m
3Scope;
4) the blocking agent LDN-2 for preparing in the step 1) is compressed into man-made fracture with cementing truck or fracturing unit truck and seal, finish the 3rd slug that three grades of slugs inject; Specifically LDN-2 is clamp-oned in the man-made fracture with the discharge capacity of 50-500L/min with cementing truck or fracturing unit truck, injection rate is at 8-15m
3Scope;
The serviceability temperature of four kinds of blocking agents is 0 ℃-75 ℃; The infusion pressure of cementing truck or fracturing unit truck is less than 30MPa, and four kinds of blocking agents are injected continuously, the infusion time continuously every.
2. low permeability reservoir waterflooding reservoir Fractured water logging oil well shutoff method according to claim 1, it is characterized in that: described alternately injection technology specifically refers to: with cementing truck or fracturing unit truck selective different with the viscosity two kinds of gel rubber system DQ-1 of profit and DQ-2 are alternately clamp-oned the stratum continuously, described continuously alternately for injecting first DQ-1, DQ-2 reinjects, and then injection DQ-1, until two kinds of blocking agents are all injected, injection period, improve constantly the blocking agent injection pressure, maximum pressure is no more than 30MPa and gets final product.
3. low permeability reservoir waterflooding reservoir Fractured water logging oil well shutoff method according to claim 1 and 2, it is characterized in that: in step 3) and 4) in add and to make LDN-1 become the initator of glue with LDN-2, addition manner adopts the mode of manually slowly appending, addition with respect to LDN-1 blocking agent and LDN-2 blocking agent all in the scope of 0.2%-0.4% mass percent.
4. low permeability reservoir waterflooding reservoir Fractured water logging oil well shutoff method according to claim 3, it is characterized in that: described initator is that concentration is 0.03% oxalic acid solution, come the mode of titration to measure its concentration with potassium permanganate, compound method is as follows: claim 0.3g oxalic acid crystal, be fed in the aqueous solution of 1000ml, namely get concentration and be 0.03% oxalic acid solution.
5. low permeability reservoir waterflooding reservoir Fractured water logging oil well shutoff method according to claim 1 and 2, it is characterized in that: the meaning of described the first slug, the second slug, the 3rd slug refers to: the liquid plugging agent that whole plug water construction injects the stratum is divided into three parts, the first slug refers to step 2 exactly) inject DQ-1 and the DQ-2 on stratum, two kinds of blocking agent injection rates are aggregated in 30-200m
3Scope; The second slug is exactly the LDN-1 that refers to step 3) injection stratum, and injection rate is at 10-30m
3Scope; The 3rd slug just refers to the LDN-2 on step 4) injection stratum, and injection rate is at 8-15m
3Scope.
6. low permeability reservoir waterflooding reservoir Fractured water logging oil well shutoff method according to claim 1 and 2, it is characterized in that: the required polyacrylonitrile of preparation DQ-1 blocking agent is that molecular weight is 3,000,000-5,000,000 polyacrylonitrile in the step 1), and the LDN-1 blocking agent viscosity for preparing is 30-100mPa s.
7. low permeability reservoir waterflooding reservoir Fractured water logging oil well shutoff method according to claim 1 and 2, it is characterized in that: the required hydrophobic association polyacrylamide of preparation DQ-2 blocking agent is that molecular weight is 5,000,000-1,000 ten thousand hydrophobic association polyacrylamide in the step 1), and the viscosity of the DQ-2 blocking agent for preparing is 50-100mPa s.
8. low permeability reservoir waterflooding reservoir Fractured water logging oil well shutoff method according to claim 1 and 2, it is characterized in that: the required starch conversion polyacrylonitrile of preparation LDN-1 blocking agent is that molecular weight is 5,000,000-1,000 ten thousand polyacrylonitrile in the step 1), required polyvinyl alcohol is that molecular weight is 3,000,000-5,000,000 polyvinyl alcohol, and the viscosity of the LDN-1 blocking agent for preparing is 30-50mPa s.
9. low permeability reservoir waterflooding reservoir Fractured water logging oil well shutoff method according to claim 1 and 2, it is characterized in that: the required polyvinyl alcohol of preparation LDN-2 blocking agent is that molecular weight is 3,000,000-5,000,000 polyvinyl alcohol in the step 1), and the viscosity of the LDN-2 blocking agent for preparing is 30-50mPa s.
10. low permeability reservoir waterflooding reservoir Fractured water logging oil well shutoff method according to claim 1 and 2, it is characterized in that: the starch conversion polyacrylonitrile is starch/modified polyacrylonitrile fiber dimension, and epoxy resin is the organic high molecular compound that contains two or more epoxide groups in the general reference molecule.
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