CN114483188B - Method for treating high-mineralization mine water by reinjection of depleted oil layer - Google Patents
Method for treating high-mineralization mine water by reinjection of depleted oil layer Download PDFInfo
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- CN114483188B CN114483188B CN202210066798.4A CN202210066798A CN114483188B CN 114483188 B CN114483188 B CN 114483188B CN 202210066798 A CN202210066798 A CN 202210066798A CN 114483188 B CN114483188 B CN 114483188B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 198
- 238000000034 method Methods 0.000 title claims abstract description 49
- 238000002347 injection Methods 0.000 claims abstract description 68
- 239000007924 injection Substances 0.000 claims abstract description 68
- 239000003129 oil well Substances 0.000 claims abstract description 42
- 239000002699 waste material Substances 0.000 claims abstract description 25
- 238000003860 storage Methods 0.000 claims abstract description 23
- 239000002351 wastewater Substances 0.000 claims abstract description 20
- 239000011435 rock Substances 0.000 claims abstract description 15
- 238000009826 distribution Methods 0.000 claims abstract description 9
- 238000000605 extraction Methods 0.000 claims abstract description 7
- 238000001730 gamma-ray spectroscopy Methods 0.000 claims abstract description 7
- 230000008569 process Effects 0.000 claims abstract description 7
- 238000005553 drilling Methods 0.000 claims abstract description 6
- 230000000694 effects Effects 0.000 claims abstract description 6
- 238000012544 monitoring process Methods 0.000 claims abstract description 6
- 230000035699 permeability Effects 0.000 claims description 24
- 238000012360 testing method Methods 0.000 claims description 20
- 238000007789 sealing Methods 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 5
- 230000006872 improvement Effects 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 4
- 239000003673 groundwater Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 238000005457 optimization Methods 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims 1
- 238000001228 spectrum Methods 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 abstract description 6
- 238000004064 recycling Methods 0.000 abstract description 6
- 239000003245 coal Substances 0.000 description 12
- 230000033558 biomineral tissue development Effects 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 5
- 238000005755 formation reaction Methods 0.000 description 5
- 238000005065 mining Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 239000003651 drinking water Substances 0.000 description 3
- 235000020188 drinking water Nutrition 0.000 description 3
- 238000011065 in-situ storage Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000006735 deficit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009189 diving Effects 0.000 description 2
- 239000003350 kerosene Substances 0.000 description 2
- 238000012946 outsourcing Methods 0.000 description 2
- 238000002407 reforming Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000001965 increasing effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/16—Modification of mine passages or chambers for storage purposes, especially for liquids or gases
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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Abstract
The invention discloses a method for treating high-mineralization mine water by reinjection of an exhausted oil layer, which comprises the steps of collecting logging data and hydraulic fracturing monitoring data in geological exploration, oil well drilling and oil extraction of an oil field, determining distribution characteristics of rock stratum and cracks in the exhausted oil layer, judging whether the rock stratum has water storage conditions according to the distribution characteristics of a crack network in the rock stratum, and performing fracturing permeability-increasing effect on the exhausted oil layer which does not have the water storage conditions locally by adopting a high-pressure reinjection method so as to achieve the water storage conditions. The integrity of the abandoned oil well or the abandoned water injection well casing is surveyed by adopting natural gamma-ray spectroscopy, and the formation of string pollution and safety accidents in the reinjection process is prevented. The waste oil well or the waste water injection well is changed into a complete reinjection well through the well head and the well bottom. The invention fully utilizes the underground space resources of the exhausted oil layer, effectively reduces the overall treatment cost of the high-salinity mine water, and realizes the low-cost reinjection treatment and recycling of the high-salinity mine water.
Description
Technical Field
The invention relates to the technical field of high-mineralization mine water treatment and recycling, in particular to a method for treating high-mineralization mine water by utilizing depleted oil layer reinjection.
Background
The existing high mineralization mine water in-situ storage technology of an underground reservoir and deep transfer storage technology are a new method for saving energy and reducing emission in mining areas. However, the in-situ storage technology of the underground reservoir of mine water utilizes the roof or the floor goaf of the coal face to build the underground reservoir, and has serious water damage threat to the coal face, so that the in-situ storage technology has the defects of high construction cost and poor safety. The deep transfer storage technology of mine water is to perform deep transfer of mine water by newly constructing a reinjection well, and has the defects of high construction cost of the reinjection well and high hydraulic fracturing engineering cost before deep reinjection.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method for treating high-mineralization mine water by reinjection of an exhausted oil layer, which not only can fully utilize underground space resources of the exhausted oil layer, but also can effectively reduce the overall treatment cost of the high-mineralization mine water, thereby realizing low-cost treatment and recycling of the high-mineralization mine water.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a method for disposing hypersalinity mine water by utilizing depleted oil layer reinjection, comprising the following steps;
step a, collecting logging data and hydraulic fracturing monitoring data during geological exploration, oil well drilling and oil extraction of an oil field, determining distribution characteristics of rock stratum and cracks in an exhausted oil layer, judging whether the rock stratum has a water storage condition according to the distribution characteristics of a crack network in the exhausted oil layer, and considering the water storage condition when the permeability coefficient K of the exhausted oil layer is more than 10 -2 m/d and has sealing or semi-sealing performance;
for the low-permeability depleted oil layer with partial sealing or semi-sealing, a high-pressure reinjection method is adopted to achieve the fracturing permeability-increasing effect, so that the permeability coefficient K is more than 10 -2 m/d, and the water storage condition is achieved.
B, surveying the integrity of the waste oil well or the waste water injection well casing by adopting natural gamma-ray spectroscopy; the well head and the well bottom of the well are modified to form a complete reinjection well.
Step c, obtaining longitudinal pressure gradient of a depleted oil layer in a waste oil well or a waste water injection well through a cable stratum test method, primarily determining mine water reinjection pressure by using the waste oil well or the waste water injection well, installing a pressure gauge, a water injection pump and a flowmeter at a reinjection well head, newly building a mine water temporary storage pool and a control chamber in a region of 500m around the reinjection well, then implementing a three-period water injection test by using the reinjection well, constructing a regular function of permeability coefficient of the depleted oil layer, wellhead stable pressure and stable reinjection amount according to process data of the water injection test by adopting a Dupuit formula, optimizing the primarily determined mine water reinjection pressure, and calculating the elastic water release coefficient and the maximum reinjection amount of the depleted oil layer by adopting a deep-time wiring method according to a pressure dissipation curve of the water injection test;
and d, injecting the highly mineralized mine water into the reinjection well based on the complete reinjection well, the mine water reinjection pressure and the mine water maximum reinjection amount.
In the step a, if the condition of recovering the pressure of the depleted oil layer stratum is better, the method belongs to a closed or semi-closed low-permeability stratum, and a high-pressure reinjection method is adopted to play a role in fracturing and permeability improvement, wherein the high-pressure reinjection method is to use high-mineralization mine water as fracturing fluid to perform high-pressure hydraulic fracturing and permeability improvement, so that the depleted stratum cracks are expanded and extended, and when the requirement of permeability coefficient K is more than 10 - 2 m/d is met, the water storage condition is met.
In the step b, the integrity of the waste oil well or the waste water injection well casing is surveyed by adopting natural gamma-ray spectroscopy, if the casing is damaged or deformed, the waste oil well needs to be dismantled and a reinjection wellhead is installed, and the waste water injection wellhead can be directly used as the reinjection wellhead; the engineering of the well bottom reconstruction of the abandoned oil well or the abandoned water injection well is to manufacture an artificial well bottom by adopting slurry plugging 1m above the exhausted oil layer.
The reinjection pressure in the step c is determined by a method combining pressure gradient measurement and water injection test optimization;
According to the formula of the confined aquifer complete well Dupuit, the confined aquifer is assumed to be a circular independent aquifer with a radius of R, and is homogenized in a layered manner, the groundwater movement is in a stable state, and the water flow of the cross section is equal to the water injection, so that the reinjection flow, the permeability coefficient and the reinjection pressure have the following relation:
P＝ρg(hw-H0) (2)
Wherein:
k-depleted reservoir permeability coefficient, m/d during reinjection;
Q-reinjection amount, m 3/d;
P-reinjection pressure, MPa;
R-reinjection affects radius, m;
r w -reinjection well casing radius, m;
M-depleted oil layer thickness, M;
H 0 -the initial still water level of the exhausted oil layer, m;
ρ—reinjected mine water density, kg/m 3;
h w -the water level after reinjection of the depleted oil layer, m.
And c, stopping water injection after the water injection test is finished by using the water injection test data in the third period, observing the pressure attenuation condition, drawing a pressure dissipation curve, and calculating the elastic water release coefficient and the maximum reinjection amount of the reinjection layer by using a deep-time wiring method.
The step of the deep-time wiring method for the elastic water release coefficient is as follows:
① Drawing a W (u) -1/u standard curve on the double-logarithmic-coordinate paper by using data of a W (u) numerical table, wherein the W (u) numerical table is a Tess well function empirical table;
② Drawing a measured (h w-h0) -t curve on another Zhang Moshu same transparent double-logarithmic paper;
③ Placing the actual curve on the standard curve, and relatively translating under the condition of keeping the corresponding coordinate axes parallel to each other until the two curves coincide;
④ Any matching point (on the curve or outside the curve) is selected, and the corresponding coordinates of the matching point are recorded: w (u), 1/u, (h w-h0) and t, selecting points where W (u) and 1/u are the integer power of 10, and substituting the points into the following formula to obtain the elastic water release coefficient:
Wherein:
Mu-depleted oil layer elastic water release coefficient, dimensionless;
Q-reinjection amount, m 3/d;
t-depleted oil layer water conductivity coefficient, dimensionless;
r—reinjection affects the radius, m,
H 0 -the initial still water level of the exhausted oil layer, m;
h w, namely the water level after reinjection of the depleted oil layer, m;
The calculation formula of the maximum reinjection amount is as follows:
V Storage device ＝μS(hw-h0) (6)
Wherein:
V Storage device -maximum reinjection amount of depleted oil layer, m 3;
Mu-depleted oil layer elastic water release coefficient, dimensionless;
S-depleted oil layer area, m 2;
h 0 -the initial still water level of the depleted oil layer 17, m;
h w -the water level after reinjection of the depleted oil layer is 18 m.
And d, injecting the highly mineralized mine water into the reinjection well based on the complete reinjection well, mine water reinjection pressure and mine water maximum reinjection amount in the steps a, b and c.
The invention has the beneficial effects that:
(1) The method utilizes the reinjection of the exhausted oil layer to treat the high-mineralization mine water, fully utilizes the underground space resource of the exhausted oil layer, and is an effective method for changing the exhausted oil layer into valuable, and is also a technical method for treating waste by waste.
(2) The abandoned oil well or the abandoned water injection well is transformed into the reinjection well, and compared with the conventional reinjection engineering, the construction cost of the reinjection well is greatly reduced.
(3) And the high-mineralization mine water is treated by reinjection of the depleted oil layer, and the water-rock coupling chemical action of the coal bed water and the oil layer water and the depleted oil layer rock mass is fully utilized, so that the reinjection treatment and recycling of the high-mineralization mine water which is an unconventional polluted water body are realized.
Drawings
Fig. 1 is a diagram of the working steps of disposal of highly mineralized mine water by depleted reservoir reinjection.
FIG. 2 is a schematic diagram of an engineering arrangement for disposal of highly mineralized mine water by depleted reservoir reinjection.
Figure 3 is a schematic of the water related parameters of a highly mineralized mine treated by depleted reservoir reinjection.
In the figure, a 1-reinjection well, a 2-wellhead, a 3-bottom hole, a 4-sleeve, a 5-pressure gauge, a 6-water injection pump, a 7-flowmeter, an 8-mine water temporary storage pool, a 9-control room, a 10-submerged aquifer, a confined aquifer with water supply significance, an 11-coal bed, a 12-depleted oil layer, a high position Shui Qiu formed by 13-reinjection, a 14-reinjection influence radius, a 15-reinjection well hole inner diameter, a 16-depleted oil layer thickness, a 17-depleted oil layer initial dead water level and an 18-depleted oil layer post-reinjection water level.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
The method for treating the hypersalinity mine water by reinjection of the depleted oil layer is characterized in that the water storage condition, reinjection well, reinjection pressure, reinjection flow and maximum reinjection amount of the depleted oil layer are determined according to logging data and hydraulic fracturing monitoring data during geological exploration, oil well drilling and oil extraction of an oil field so as to realize reinjection treatment and recycling of the hypersalinity mine water.
As shown in FIG. 1, the implementation of the invention provides a method for disposing of highly mineralized mine water by reinjection of depleted oil reservoirs, comprising the following steps 100-500.
Step 100, judging whether the depleted oil layer has water storage conditions.
Logging data and hydraulic fracturing monitoring data during geological exploration, oil well drilling and oil extraction of the oil field where the depleted oil layer 12 is located are collected, and distribution characteristics of rock stratum and cracks in the depleted oil layer 12 are determined. Judging whether the rock stratum has a water storage condition according to the distribution characteristics of a fracture network in the rock stratum, and considering the water storage condition when the permeability coefficient K of the depleted oil layer 12 is more than 10 -2 m/d and has sealing or semi-sealing performance.
Step 200, high-pressure water injection hydraulic fracturing anti-reflection.
For the low-permeability depleted oil layer 12 with partial sealing or semi-sealing, a high-pressure reinjection method is adopted to achieve the fracturing and permeability increasing effects, so that the permeability coefficient K is more than 10 -2 m/d, and the water storage condition is achieved.
By judging and reforming the exhausted oil layer, the underground space of the exhausted oil layer is effectively utilized, and meanwhile, the high-mineralization mine water is used as the fracturing fluid, so that the cost of outsourcing water sources in hydraulic fracturing engineering is effectively saved.
And 300, selecting a waste oil well or a waste water injection well with a complete casing 4, and modifying the waste oil well or the waste water injection well into the reinjection well 1.
The integrity of the waste oil well or waste water injection well casing 4 is surveyed by adopting natural gamma-ray spectroscopy, so that string pollution and safety accidents are prevented from being formed in the reinjection process, if the casing is damaged and deformed, the casing cannot be used for reinjection engineering of high-mineralization mine water, the waste oil well or waste water injection well with the complete casing is selected, and the wellhead and the bottom of the waste oil well or waste water injection well are modified to form a complete reinjection well;
If the casing 4 is damaged or deformed, it cannot be used for reinjection of highly mineralized mine water. The complete abandoned oil well or abandoned water injection well of the casing 4 is selected, and the well mouth 2 and the well bottom 3 of the abandoned oil well or abandoned water injection well are modified to form a complete reinjection well 1.
The integrity of the waste oil well or the waste water injection well casing is surveyed by adopting natural gamma-ray spectroscopy, whether the casing is damaged, deformed and the like is detected, so that the formation of string layer pollution of highly mineralized mine water in the reinjection process is effectively prevented, the influence on the diving and confined water aquifer with water supply significance above the depleted oil layer is caused, and the drinking water safety accident is caused; meanwhile, the coal mining production activity of the coal-bearing stratum above the depleted oil layer is prevented from being influenced, and the coal mine water damage accident is caused. Therefore, only a complete waste oil well or a complete waste water injection well of the sleeve can be transformed into a complete mine water reinjection well with high mineralization degree, the waste oil well needs to be dismantled and a reinjection well head is installed by a well head and a cover plate, and the waste water injection well head can be directly used as the reinjection well head; the engineering of the well bottom reconstruction of the abandoned oil well or the abandoned water injection well is to manufacture an artificial well bottom by adopting slurry plugging 1m above the exhausted oil layer. The abandoned oil well or the abandoned water injection well is utilized to be changed into the reinjection well, the abandoned oil well or the abandoned water injection well in the depleted oil layer area is effectively utilized, the reinjection well is not required to be constructed, and the cost of reinjection disposal of the mine water with high mineralization degree is effectively reduced.
Step 400, determining the reinjection pressure, the reinjection flow and the maximum reinjection amount.
The method comprises the steps of obtaining a longitudinal pressure gradient of a depleted oil layer in a waste oil well or a waste water injection well through a cable stratum testing method, preliminarily determining the reinjection pressure of mine water by using the corresponding waste oil well or waste water injection well, installing water injection equipment such as a pressure gauge 5, a water injection pump 6, a flowmeter 7 and the like in a reinjection wellhead 2 as shown in fig. 2, newly establishing a mine water temporary storage pool 8 and a control room 9, then carrying out a three-period water injection test by using the reinjection well 1, and constructing a regular function of the permeability coefficient of the depleted oil layer 12, the stable pressure of the wellhead 2 and the stable reinjection amount by adopting a Dupuit formula according to process data of the water injection test so as to optimize the preliminarily determined mine water reinjection pressure. And calculating the elastic water release coefficient and the maximum reinjection amount of the reinjection layer by adopting a deep-time wiring method according to the pressure dispersion curve of the water injection test.
Step 500: and injecting the mine water with high mineralization into the reinjection well 1 based on the complete reinjection well 1, the reinjection pressure, the reinjection flow and the maximum reinjection amount.
In an embodiment, logging data, hydraulic fracture monitoring data, and other data collected in step 100 during geological exploration, drilling, and oil recovery of an oil field must be truly reliable, and distribution characteristics of rock formations and fractures in the depleted oil reservoir 12 must be checked one by one, so as to avoid potential safety hazards of incorrect data, such as determining buried oil reservoir 12 and reinjection well 1.
In the embodiment, if the recovery condition of the formation pressure of the depleted oil layer 12 is better in the step 200, the fracturing and permeability improvement effects are achieved by adopting a high-pressure reinjection method, wherein the low-permeability formation belongs to a closed or semi-closed stratum. The high-pressure reinjection method is to use high-mineralization mine water as fracturing fluid to perform high-pressure hydraulic fracturing permeation enhancement, so that exhausted stratum cracks are expanded and extended, and when the requirement that the permeability coefficient K is more than 10 -2 m/d is met, the water storage condition is met. By judging and reforming the exhausted oil layer 12, the underground space resource of the exhausted oil layer 12 is effectively utilized, and meanwhile, the cost of outsourcing water sources in hydraulic fracturing engineering is effectively saved by using the highly mineralized mine water as fracturing fluid.
In the embodiment, in step 300, the integrity of the waste oil well or the waste water injection well sleeve 4 is surveyed by adopting natural gamma-ray spectroscopy, whether the sleeve 4 is damaged, deformed and the like is detected, so that the formation of string layer pollution of highly mineralized mine water in the reinjection process is effectively prevented, the influence on the submerged aquifer above the depleted oil layer 12 and the confined aquifer 10 with water supply significance is caused, and the drinking water safety accident is caused; meanwhile, the coal mining production activity of the coal seam 11 above the depleted oil layer 12 is prevented from being influenced, and the coal mine water damage accident is caused. Therefore, only the complete abandoned oil well or the abandoned water injection well of the sleeve 4 can be transformed into the complete mine water reinjection well 1 with high mineralization degree. The abandoned oil well needs to remove the oil extraction well head and the cover plate and install the reinjection well head 2, and the abandoned water injection well can be directly used as the reinjection well 1; the engineering of the well bottom reconstruction of the abandoned oil well or the abandoned water injection well is to manufacture an artificial well bottom 3 by adopting slurry plugging 1m above the exhausted oil layer. The abandoned oil well or the abandoned water injection well is utilized to be changed into the reinjection well 1, the abandoned oil well or the abandoned water injection well in the area of the depleted oil layer 12 is effectively utilized, the reinjection well 1 is not required to be constructed, and the reinjection disposal cost of the mine water with high mineralization degree is effectively reduced.
In an embodiment, the reinjection pressure in step 400 is determined using a pressure gradient method measurement in combination with water injection test optimization.
As shown in fig. 3, according to the formula of the confined aquifer complete well Dupuit, the confined aquifer is assumed to be a circular independent aquifer with a radius R, and is layered and homogenized, the groundwater moves to be in a stable state, and the water flow of the cross section is equal to the water injection, so that the reinjection flow, the permeability coefficient and the reinjection pressure have the following relationship:
P＝ρg(hw-H0) (2)
Wherein:
k-the permeability coefficient of the depleted oil layer 12, m/d during reinjection;
Q-reinjection amount, m 3/d;
P-reinjection pressure, MPa;
R is the reinjection influence radius 14, m, as shown in figure 3, the high part Shui Qiu formed by reinjection can reflect the influence range of reinjection, and the vertical distance between the boundary of the influence range and the reinjection well is the reinjection influence radius 14;
r w -reinjection well casing radius, retrieval of 15/2, m of the injection well casing inside diameter;
M-depleted oil layer thickness 16, M;
H 0 -the initial still water level 17, m of the depleted oil layer;
ρ—reinjected mine water density, kg/m 3;
h w -the water level after reinjection of the depleted oil layer is 18 m.
And in step 400, water injection is stopped after the water injection test is finished by using the water injection test data in the third period, the pressure attenuation condition is observed, and a pressure dissipation curve is drawn. And then calculating the elastic water release coefficient and the maximum reinjection amount of the reinjection layer by adopting a deep-time wiring method.
The step of the deep-time wiring method for obtaining the elastic water release coefficient is as follows:
① The W (u) -1/u standard curve was plotted on a double logarithmic paper using the data of the W (u) value table. The W (u) numerical table is a Tess well function empirical table;
② The measured (h w-h0) -t curve was plotted on another Zhang Moshu identical transparent double paper.
③ And placing the actual curve on the standard curve, and relatively translating under the condition of keeping the corresponding coordinate axes parallel to each other until the two curves coincide.
④ Any matching point (on the curve or outside the curve) is selected, and the corresponding coordinates of the matching point are recorded: w (u), 1/u, (h w-h0), t. To simplify the calculation, points where W (u) and 1/u are the integer powers of 10 are chosen as much as possible. Then substituting the following formula to calculate the elastic water release coefficient:
Wherein:
Mu-depleted oil layer elastic water release coefficient, dimensionless;
Q-reinjection amount, m 3/d;
t-depleted oil layer water conductivity coefficient, dimensionless;
R—reinjection affects the radius of the radial 14, m,
H 0 -the initial still water level of the depleted oil layer 17, m;
h w -the water level after reinjection of the depleted oil layer is 18 m.
The calculation formula of the maximum reinjection amount is as follows:
V Storage device ＝μS(hw-h0) (6)
Wherein:
V Storage device -maximum reinjection amount of depleted oil layer, m 3;
Mu-depleted oil layer elastic water release coefficient, dimensionless;
S-depleted oil layer area, m 2;
h 0 -the initial still water level of the depleted oil layer 17, m;
h w -the water level after reinjection of the depleted oil layer is 18 m.
In an embodiment, step 500 is performed by injecting highly mineralized mine water into the reinjection well based on the reinjection well, the reinjection pressure and the maximum reinjection amount determined in steps 100, 200, 300 and 400, so that the reinjection treatment engineering has the characteristics of high efficiency, low cost, sustainability and the like.
The invention provides a new thought for treating high mineralization mine water by reinjection of depleted oil layers in a kerosene resource overlapping area around the concept of treating waste with waste according to local conditions. The oil layer of the kerosene resource overlapping area is positioned below the diving aquifer, the confined aquifer with drinking water meaning and the coal-bearing stratum. And after the oilfield exploitation is shut down, the stratum deficit is beneficial to the recovery of the stratum pressure by the reinjection treatment of the hypersalinity mine water, and the energy consumption of the reinjection treatment is effectively reduced by the stratum deficit.
The mineralization degree of the depleted oil layer water is generally higher than that of mine water formed by coal mining, so that the reinjection treatment method based on the water-rock coupling chemical action of the mine water and rock mass meets the environmental protection requirement of 'good water reinjection'. The total treatment cost of the hypersalinity mine water is effectively reduced by utilizing the underground space resources of the exhausted oil layer, so that the hypersalinity mine water which is an unconventional polluted water body is reinjected and recycled.
The invention not only can fully utilize the underground space resources of the exhausted oil layer, but also can effectively reduce the overall treatment cost of the hypersalinity mine water, thereby realizing the low-cost treatment and recycling of the hypersalinity mine water.
Claims (4)
1. A method for disposing hypersalinity mine water by utilizing depleted oil layer reinjection, which is characterized by comprising the following steps of;
Step 1, collecting logging data and hydraulic fracturing monitoring data during geological exploration, oil well drilling and oil extraction of an oil field, determining distribution characteristics of rock stratum and cracks in an exhausted oil layer, judging whether the rock stratum has a water storage condition according to the distribution characteristics of a crack network in the exhausted oil layer, and considering the water storage condition when the permeability coefficient K of the exhausted oil layer is more than 10 -2 m/d and has sealing or semi-sealing performance;
For the low-permeability depleted oil layer with partial sealing or semi-sealing, a high-pressure reinjection method is adopted to achieve the fracturing permeability-increasing effect, so that the permeability coefficient K is more than 10 -2 m/d, and the water storage condition is achieved;
Step 2, surveying the integrity of the waste oil well or the waste water injection well casing by adopting natural gamma-ray spectroscopy; the waste oil well or the wellhead and the bottom of the water injection well are modified to form a complete reinjection well;
Step 3, obtaining longitudinal pressure gradient of the depleted oil layer in the abandoned oil well or the abandoned water injection well through a cable stratum testing method, preliminarily determining mine water reinjection pressure by utilizing the corresponding abandoned oil well or the abandoned water injection well, installing a pressure gauge, a water injection pump and a flowmeter at a reinjection wellhead, newly building a temporary storage pool and a control room of mine water in a region of 500m around the reinjection well, then implementing a three-period water injection test by utilizing the reinjection well, constructing a regular function of permeability coefficient of the depleted oil layer, wellhead stable pressure and stable reinjection amount according to process data of the water injection test by adopting a Dupuit formula, optimizing the preliminarily determined mine water reinjection pressure, and calculating the elastic water release coefficient and the maximum reinjection amount of the depleted oil layer by adopting a deep-time wiring method according to a pressure dissipation curve of the water injection test;
Step 4, injecting high-mineralization mine water into the reinjection well based on the complete reinjection well, the mine water reinjection pressure and the mine water maximum reinjection amount;
In the step1, if the condition of recovering the pressure of the depleted oil layer stratum is better, the method belongs to a closed or semi-closed hypotonic stratum, and a high-pressure reinjection method is adopted to play a role in fracturing and permeability improvement, wherein the high-pressure reinjection method is to use high-mineralization mine water as fracturing fluid to perform high-pressure hydraulic fracturing and permeability improvement so as to expand and extend the depleted stratum cracks, and when the requirement of permeability coefficient K is more than 10 -2 m/d is met, the water storage condition is met;
In the step 2, natural gamma energy spectrum logging is adopted to survey the integrity of the waste oil well or the waste water injection well casing, if the casing is damaged or deformed, the waste oil well needs to be dismantled from the oil extraction well head and the cover plate and is provided with a reinjection well head, and the waste water injection well can be directly used as the reinjection well; the engineering of the well bottom reconstruction of the abandoned oil well or the abandoned water injection well is to manufacture an artificial well bottom by adopting slurry blocking 1m above the exhausted oil layer;
The reinjection pressure in the step3 is determined by a method combining pressure gradient measurement and water injection test optimization;
According to the formula of the confined aquifer complete well Dupuit, the confined aquifer is assumed to be a circular independent aquifer with a radius of R, and is homogenized in a layered manner, the groundwater movement is in a stable state, and the water flow of the cross section is equal to the water injection, so that the reinjection flow, the permeability coefficient and the reinjection pressure have the following relation:
P＝ρg(hw-H0) (2)
Wherein:
k-depleted reservoir permeability coefficient, m/d during reinjection;
Q-reinjection amount, m 3/d;
P-reinjection pressure, MPa;
R-reinjection affects radius, m;
r w -reinjection well casing radius, m;
M-depleted oil layer thickness, M;
H 0 -the initial still water level of the exhausted oil layer, m;
ρ—reinjected mine water density, kg/m 3;
h w -the water level after reinjection of the depleted oil layer, m.
2. The method for treating highly mineralized mine water by reinjection of depleted oil layer according to claim 1, wherein the step 3 uses the data of the third period water injection test, stops water injection after the water injection test is finished, observes the pressure decay condition, draws a pressure dissipation curve, and then calculates the elastic water release coefficient and the maximum reinjection amount of the reinjection layer by adopting a deep-time wiring method.
3. A method of disposing of hypersalinity mine water by means of depleted oil reservoir reinjection according to claim 2, characterized in that the deep-time wiring method comprises the steps of:
1.1 drawing a W (u) -1/u standard curve on double logarithmic coordinate paper by using data of a W (u) numerical table, wherein the W (u) numerical table is a Tess well function empirical table;
1.2 drawing a measured (h w-h0) -t curve on another Zhang Moshu identical transparent bipartite paper;
1.3, placing the actual curve on the standard curve, and relatively translating under the condition of keeping the corresponding coordinate axes parallel to each other until the two curves coincide;
1.4, any matching point is selected, and corresponding coordinates of the matching point are recorded: w (u), 1/u, (h w-h0) and t, selecting points where W (u) and 1/u are the integer power of 10, and substituting the points into the following formula to obtain the elastic water release coefficient:
Wherein:
Mu-depleted oil layer elastic water release coefficient, dimensionless;
Q-reinjection amount, m 3/d;
t-depleted oil layer water conductivity coefficient, dimensionless;
r—reinjection affects the radius, m,
H 0 -the initial still water level of the exhausted oil layer, m;
h w, namely the water level after reinjection of the depleted oil layer, m;
The calculation formula of the maximum reinjection amount is as follows:
V Storage device ＝μS(hw-h0) (6)
Wherein:
V Storage device -maximum reinjection amount of depleted oil layer, m 3;
Mu-depleted oil layer elastic water release coefficient, dimensionless;
S-depleted oil layer area, m 2;
h 0 -the initial still water level of the exhausted oil layer, m;
h w -the water level after reinjection of the depleted oil layer, m.
4. The method for treating highly mineralized mine water by means of depleted oil reservoir reinjection according to claim 1, wherein the step 4 is based on the complete reinjection well, mine water reinjection pressure and mine water maximum reinjection amount in steps 1,2 and 3, and is performed by injecting highly mineralized mine water into the reinjection well.
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