CN111852394A - Method for blocking bottom water coning - Google Patents
Method for blocking bottom water coning Download PDFInfo
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- CN111852394A CN111852394A CN202010719395.6A CN202010719395A CN111852394A CN 111852394 A CN111852394 A CN 111852394A CN 202010719395 A CN202010719395 A CN 202010719395A CN 111852394 A CN111852394 A CN 111852394A
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- plugging
- oil
- plugging agent
- perforation
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
- E21B33/138—Plastering the borehole wall; Injecting into the formation
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
Abstract
The invention discloses a method for plugging bottom water coning, which comprises the steps of plugging an original perforation section, perforating at the upper part of an original oil-water interface, injecting a plugging agent into the perforation, controlling the injection pressure to ensure that the plugging agent mainly flows in a radial direction and secondarily flows in a longitudinal direction to enter the deep part of a stratum to the greatest extent, expanding the plugging area as far as possible, plugging the source of bottom water to thoroughly block a channel of the bottom water coning, simultaneously avoiding plugging an oil-gas layer, then perforating again at the original perforation section for production, greatly improving the bottom water coning plugging success rate and enabling the oil-gas well to recover the oil-gas production capacity.
Description
Technical Field
The invention relates to the field of oil and gas exploitation, in particular to a method for blocking bottom water coning.
Background
For oil and gas reservoirs with bottom water, the method is characterized by having obvious oil-water and gas-water interfaces and having no barrier. The oil and gas wells of the reservoir have unreasonable selection of production modes or the oil and gas wells produce more than critical production, so that bottom water is coning, the water content of the oil and gas wells rises rapidly, the oil and gas wells are steeply flooded in a short time (figure 2), and the production effect of the oil and gas wells is seriously influenced.
The existing method for blocking bottom water coning is considered to be a challenging problem in the industry, a chemical blocking agent is extruded into an original perforation section of an oil and gas well to block the bottom water coning, but the effective rate is low, and meanwhile, the risk that the perforation section of the oil and gas well is completely blocked to cause the oil and gas well to lose the production capacity exists; secondly, the plugging range is limited and the effective period is very short.
Disclosure of Invention
Aiming at the problem of bottom water coning plugging in the prior art, the invention provides a method for plugging the bottom water coning, which improves the bottom water coning plugging success rate and recovers the oil and gas production capacity.
The invention is realized by the following technical scheme:
a method of plugging a bottom water coning, the method comprising:
plugging the original perforation section;
determining a plugging agent injection position line 3 for plugging bottom water according to an original oil-water interface in a reservoir, and enabling the plugging agent injection position line to be close to the upper part of the original oil-water interface;
perforating at the injection position line of the plugging agent;
injecting a plugging agent into the perforation and sealing the perforation, controlling the injection pressure to enable the plugging agent to flow radially, and blocking a channel in which bottom water is tapered;
and perforating again in the original perforation section.
Preferably, the method for plugging the primary perforation segment comprises the following steps:
filling sand in the shaft to the position below the original perforation section, then injecting a plugging agent into the original perforation section, and finally injecting cement for sealing.
Preferably, injecting a first pre-plugging agent into the primary perforation section, wherein the maximum injection pressure is 0.7 times of the fracture pressure of the stratum;
the cement slurry consumption is calculated according to 10L for each blast hole, and then multiplied by 1.6 times, and the specific gravity is 1.4 times of that of the produced water of the oil well.
Preferably, the method for calculating the first pre-plugging agent injection amount Q is as follows:
Q＝Rradius of treatment×3.14×HThickness of oil layerX F oil layer saturation
Wherein R is the treatment radius, the thickness of an H oil layer and the saturation of an F oil layer;
the first pre-plugging agent is associative polyacrylamide, the low viscosity is 320mPa.s, and the high viscosity is 8000 mPa.s.
Preferably, the original oil-water interface is determined according to a comprehensive log of the oil well, and the injection position line 3 of the plugging agent is 0.5m-1.5m above the position of the original oil-water interface 10.
Preferably, the perforation is located 0.5m-1.5m above the plugging agent injection position line.
Preferably, the second pre-plugging agent is injected into the perforation firstly, then the main plugging agent is injected, and finally the cement is adopted for sealing;
the dosage of the second front plugging agent is the perforation section thickness multiplied by 15m3；
The dosage of the main plugging agent is the product of the thickness of the perforation section and 30m3The injection pressure does not exceed 60% of the reservoir fracture pressure.
Preferably, the second pre-plugging agent comprises 1800 million associative polymers, a phenolic resin cross-linking agent and a jelly stabilizing agent;
the main plugging agent comprises 1800 million of association polymer, phenolic resin cross-linking agent, jelly stabilizer, pre-crosslinking particles and suspension swelling tackifying particles.
Preferably, the thickness of the new perforation is 70% of the thickness of the original perforation segment.
Preferably, the original perforation section is plugged and then subjected to pressure test leakage detection, and the method for pressure test leakage detection comprises the following steps:
after the well is washed, the packer is put down to the upper part 5m of the original perforation section, and the positive and negative error is 0.5 m. Circulating clear water to wash the well, stopping pumping water when the emptying position of the casing pipe gate returns to be clean and no oil or air bubbles return, closing the relevant gate, pressurizing the casing pipe to 10MPa at 200L/min for pressure maintaining and leakage detection, and performing the next step if no pressure leakage exists; if the pressure leakage exists, the pressure leakage position is found in a segmented mode, the water absorption index is calculated, the leakage is detected through pressure maintaining after the leakage is stopped, and the pressure leakage is detected until no pressure leakage exists.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention provides a method for plugging bottom water coning, which comprises the steps of plugging an original perforation section, perforating at the upper part of an original oil-water interface, injecting a plugging agent into the perforation, controlling injection pressure to ensure that the plugging agent mainly flows in a radial direction and secondarily flows in a longitudinal direction, entering the deep part of a stratum to the greatest extent, expanding the plugging area as far as possible, plugging the source of bottom water, reducing the channel of the bottom water coning to the greatest extent, avoiding plugging an oil-gas layer, then perforating again at the original perforation section for production, greatly improving the bottom water coning plugging success rate and recovering the oil-gas production capacity of the oil-gas well.
Further, according to the original oil-water interface, determining the current oil-water interface of the oil well, taking the interface as a plugging agent injection position line, performing perforation injection on the plugging agent, performing perforation again near the oil-water, gas-water interface, ensuring that the plugging agent only enters a water layer, and avoiding plugging the oil-gas layer; simultaneously, the source of bottom water is blocked, and the channel of bottom water coning is thoroughly blocked.
Furthermore, by controlling the perforation thickness and controlling the pressure, the plugging area is maximized and the bottom water coning is prevented in a larger range under the condition of the same amount of plugging agents.
Furthermore, the perforation section of the plugging agent is plugged by adopting a preposed plugging agent and cement, so that the perforation section is plugged to the maximum extent, and no output capacity is ensured.
Drawings
FIG. 1 is a schematic illustration of plugging of a primary perforation segment according to the present invention;
FIG. 2 is a schematic illustration of plugging of a bottom water plugging section according to the present invention;
FIG. 3 is a schematic diagram of the bottom water plugging section of the present invention after plugging.
In the figure: 1. a wellbore; 3. a plugging agent injection position line; 4. a beveled tip string; 5. cement; 6. a first pre-plugging agent; 7. an original perforation section; 8. sand and stone; 9. a bottom water plugging section; 10. an original oil-water interface; 11. newly perforating; 12. a bottom water pipe column; 13. a primary plugging agent; 14. a second pre-plugging agent.
Detailed Description
The present invention will now be described in further detail with reference to the attached drawings, which are illustrative, but not limiting, of the present invention.
Referring to fig. 1-3, a method of plugging a bottom water coning includes the steps of:
Specifically, the original oil-water interface 10 is determined according to a comprehensive log of the oil well, the plugging agent injection position line 3 is a preset position on the upper portion of the original oil-water interface 10, and in this embodiment, the plugging agent injection position line 3 is a position 1m above the original oil-water interface 10.
And 2, cleaning the oil well, and carrying out pressure test and leakage detection.
Specifically, after the well 1 is washed, the Y211-114 packer is put down to the position 5m above the original perforation section, and the positive and negative errors are 0.5 m. Circulating clear water to wash the well, stopping pumping water by the cement truck when the emptying position of the casing pipe gate is clean and no oil gas returns, closing the related gate, pumping the casing pipe to 10MPa at 200L/min for pressure maintaining and leakage detection, and executing the step 3 if no pressure leakage exists; if the pressure leakage exists, the pressure leakage position is found in a segmented mode, the water absorption index is calculated, the leakage is detected through pressure maintaining after the leakage is stopped, and the pressure leakage is detected until no pressure leakage exists.
And 3, filling sand below the original perforation section 7, then injecting a plugging agent into the original perforation section 7, and finally injecting cement 5 for plugging.
The method comprises the following steps of putting an inclined pointed pipe column 4 into a well, filling sand 8 to enable the sand surface to be located 3m below an original perforation section 7, enabling the positive and negative error to be 0.5m, circularly washing the well, and firstly extruding and injecting a first preposed plugging agent 6 under the condition that no gas exists in overflow observed at a casing outlet, wherein the using amount of the first preposed plugging agent 6 is 10-15 times of the thickness of the perforation section, and the maximum injection pressure is 0.7 times of the formation fracture pressure; and (3) squeezing and injecting cement paste, wherein the using amount of the cement paste is 10L of the number of the foam holes and multiplied by 1.6 times, the specific gravity is 1.4 times of that of oil well output liquid, the pressure test is qualified after the cement paste is solidified, the original perforation section 7 is plugged by cement 5, and then the step 4 is executed.
The first pre-plugging agent injection amount Q is calculated as follows:
Q＝Rradius of treatment×3.14×HThickness of oil layerX F oil layer saturation
Wherein R is the treatment radius, H reservoir thickness, F reservoir saturation, and R is 20m
The first preposed plugging agent 6 is G7 associated polyacrylamide, has the molecular weight of 2200 ten thousand and the concentration of 0.3 percent, has the low-viscosity injection characteristic, the viscosity of 320mPa.s and the high-viscosity plugging function, has the viscosity of 8000mPa.s, has the characteristic of limiting water to enter, and has high temperature and salt resistance of gel.
The cement used in the cement slurry is G-grade cement for oil wells.
And 4, grinding the solidified cement 5 to enable the height of the sand surface to be reduced below the plugging agent injection position line 3, setting the height above the plugging agent injection position line 3 as a bottom water plugging section 9, and perforating the bottom water plugging section 9.
Specifically, a drilling and grinding pipe column is put into the well to grind and drill the solidified cement 5 and wash sand, so that the sand surface reaches a position 10m below a plugging agent injection position line 3, and then perforation is carried out at a position 0.5m-1.5m above the plugging agent injection position line 3.
In the step, the perforation position and the perforation thickness near the oil-water interface are controlled, the perforation thickness is 20% of the thickness of a water layer, the blocking area is maximized under the condition of the same amount of blocking agents, and the bottom water coning is prevented in a large range.
And 5, plugging the perforation in the step 4 by using a plugging agent to realize the oil-water layer packing.
Specifically, a bottom water pipe column 12 is put into the well, the well is circularly washed until overflow occurs at the well mouth, a second preposed plugging agent 14 is injected to the position of a perforation section, a sleeve gate is closed, a main plugging agent 13 for plugging the bottom water is squeezed and injected, then cement 5 is adopted for sealing, and when the pressure is reduced to zero, the bottom water pipe column 12 is lifted to a safe distance for waiting for setting for 48 hours.
The safety distance is about 50m of the injection section.
The dosage of the second front plugging agent 14 is the perforation section thickness multiplied by 15m3。
The dosage of the main plugging agent 13 is the perforation section thickness multiplied by 30m3The injection pressure does not exceed 60% of the reservoir fracture pressure.
In the step, the injection pressure and flow of the main plugging agent are controlled to promote the main plugging agent to mainly enter the deep part of the stratum by taking radial flow as a main part, and the main plugging agent is strictly injected at low pressure and low flow, so that the longitudinal movement of the plugging agent is reduced as much as possible, the main plugging agent is ensured to mainly take radial movement, and the main plugging agent enters the deep part of the stratum to the greatest extent to plug a larger range.
In the allowable highest pressure range, low-flow injection is adopted, a shaft is circulated by clear water, the injection of the plugging agent into a well section is changed, namely, perforating is carried out again near an oil-water interface, a gas-water interface, and the purpose of the method is to ensure that the plugging agent only enters a water layer and prevent an oil-gas layer from being plugged; and secondly, the source of bottom water is blocked, the degree of bottom water coning into a channel is reduced, and meanwhile, cement 5 is used as a final sealing blocking agent to completely block a new perforation section, so that no generating capacity of the new perforation section is ensured.
The second pre-plugging agent 14 is composed of 1800 million associative polymers, phenolic resin cross-linking agents, and jelly stabilizing agents.
The main plugging agent 13 consists of 1800 million of associated polymer, phenolic resin cross-linking agent, jelly stabilizer, pre-cross-linked particles and suspended swelling tackifying particles.
The plugging agent has stable performance and long validity period, improves the plugging effect and prolongs the validity period.
And 6, cleaning the cement 5 in the shaft 1 to enable the cement surface to be reduced to be lower than the original perforation section, and then perforating again in the original perforation section.
As shown in fig. 3, drilling and grinding the cement surface to 20m below the original perforation section, putting out the drilling and grinding drilling tool, taking 70% of the thickness of the original perforation section as the re-perforation thickness, re-perforating near the upper part of the original perforation section according to the comprehensive logging map to obtain a new perforation 11, washing the well until the return liquid of the casing is clean, and producing the oil production pipe according to the design.
The method for plugging bottom water coning determines an original oil-water interface of an oil layer according to an oil well comprehensive log map, firstly injects plugging prepad fluid into an original perforation section, then extrudes cement to plug the original perforation section, determines the current oil-water interface of an oil well according to the water-containing change characteristics of the oil well by using an original oil-water interface line, namely determines that a plugging bottom water plugging agent is injected into the perforation section, firstly extrudes the plugging bottom water prepad plugging agent from the plugging bottom water perforation section, then injects a main body plugging agent, then plugs the plugging bottom water perforation section by using the cement, thoroughly plugs a new perforation section, ensures no output capacity, has high plugging efficiency and long validity period, and finally carries out perforation production again on the upper part of the original perforation section of the oil well; the method avoids blocking the oil-gas layer, ensures the original production capacity of the oil-gas well, greatly improves the bottom water coning and blocking success rate, and enables the oil-gas well to recover the oil-gas production capacity.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. A method of plugging a bottom water coning, the method comprising:
plugging the original perforation section;
determining a plugging agent injection position line (3) for plugging bottom water according to an original oil-water interface in a reservoir, and enabling the plugging agent injection position line to be close to the upper part of the original oil-water interface;
perforating at the injection position line of the plugging agent;
injecting a plugging agent into the perforation and sealing the perforation, controlling the injection pressure to enable the plugging agent to flow radially, and blocking a channel in which bottom water is tapered;
and perforating again in the original perforation section.
2. The method for plugging bottom water coning according to claim 1, wherein the method for plugging the primary perforation segment comprises the following steps:
filling sand in the shaft to the position below the original perforation section (7), then injecting a plugging agent into the original perforation section (7), and finally injecting cement (5) for sealing.
3. The method of claim 2, wherein the primary perforation zone is injected with a first pre-plugging agent at a maximum pressure of 0.7 times the fracture pressure of the formation;
the cement slurry consumption is calculated according to 10L for each blast hole, and then multiplied by 1.6 times, and the specific gravity is 1.4 times of that of the produced water of the oil well.
4. The method for plugging bottom water coning according to claim 2, wherein the first pre-plugging agent injection quantity Q is calculated as follows:
Q＝Rradius of treatment×3.14×HThickness of oil layerX F oil layer saturation
Wherein R is the treatment radius, the thickness of an H oil layer and the saturation of an F oil layer;
the first pre-plugging agent (6) is associative polyacrylamide, the low viscosity is 320mPa.s, and the high viscosity is 8000 mPa.s.
5. The method for plugging bottom water coning according to claim 1, wherein the original oil water interface (10) is determined from a comprehensive log of the oil well, and the plugging agent injection position line (3) is 0.5m to 1.5m above the original oil water interface (10).
6. A method of plugging bottom water coning according to claim 1, wherein said perforations are located 0.5m-1.5m above the plugging agent injection location line (3).
7. A method of plugging bottom water coning according to claim 1, characterized in that the second pre-plugging agent (14) is injected first in the perforation, then the main plugging agent (13) is injected, and finally the cement is used for sealing;
the dosage of the second front plugging agent (14) is the perforation section thickness multiplied by 15m3；
The dosage of the main plugging agent (13) is the product of the thickness of the perforation section and 30m3The injection pressure does not exceed 60% of the reservoir fracture pressure.
8. The method of claim 7, wherein the second pre-plugging agent comprises 1800 million associative polymer, a phenolic resin cross-linking agent, and a jelly stabilizing agent;
the main plugging agent comprises 1800 million of association polymer, phenolic resin cross-linking agent, jelly stabilizer, pre-crosslinking particles and suspension swelling tackifying particles.
9. The method of claim 1 wherein the new perforation has a thickness of 70% of the original perforation length.
10. The method for plugging the coning of the bottom water as claimed in claim 1, wherein the method for testing pressure and leakage is carried out after plugging the original perforation section, and the method for testing pressure and leakage is as follows:
after a shaft (1) is washed, a packer is put down to the position 5m above the original perforation section, the positive and negative error is 0.5m, clean water is circulated to wash the well, when the emptying position of a casing pipe gate returns to be clean and no oil or air bubbles return out, water pumping is stopped, the relevant gate is closed, the casing pipe is pressurized to 10MPa at 200L/min for pressure maintaining and leakage detection, and if no pressure leakage exists, the next step is carried out; if the pressure leakage exists, the pressure leakage position is found in a segmented mode, the water absorption index is calculated, the leakage is detected through pressure maintaining after the leakage is stopped, and the pressure leakage is detected until no pressure leakage exists.
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| CN202010719395.6A CN111852394A (en) | 2020-07-23 | 2020-07-23 | Method for blocking bottom water coning |
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