CN111021977B - Method for quickly removing soluble bridge plug in case of blocking - Google Patents

Method for quickly removing soluble bridge plug in case of blocking Download PDF

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Publication number
CN111021977B
CN111021977B CN201911155485.0A CN201911155485A CN111021977B CN 111021977 B CN111021977 B CN 111021977B CN 201911155485 A CN201911155485 A CN 201911155485A CN 111021977 B CN111021977 B CN 111021977B
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bridge plug
soluble
well
slug
sand
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CN111021977A (en
Inventor
白晓虎
李晓燕
邓咸安
余兴国
向奎
陈强
杜现飞
李川
殷桂琴
黄蓬刚
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Petrochina Co Ltd
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Petrochina Co Ltd
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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
    • E21B29/00—Cutting or destroying pipes, packers, plugs, or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C23/00—Alloys based on magnesium
    • C22C23/02—Alloys based on magnesium with aluminium as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C23/00—Alloys based on magnesium
    • C22C23/04—Alloys based on magnesium with zinc or cadmium as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C30/00—Alloys containing less than 50% by weight of each constituent
    • C22C30/06—Alloys containing less than 50% by weight of each constituent containing zinc
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25—Methods for stimulating production
    • E21B43/26—Methods for stimulating production by forming crevices or fractures

Abstract

The invention belongs to the technical field of oil extraction in oil fields, and particularly provides a method for quickly removing a soluble bridge plug when meeting a blockage, which comprises the steps of sequentially injecting clear water, a dissolving liquid accelerating slug and clear water into a wellhead, and stopping a pump and shutting down a well after the slug meets a blockage position; injecting clear water, and stopping the pump and shutting down the well after the slug replaces the position meeting the blockage; injecting a sand-carrying fluid slug into a wellhead to polish the casing wall of the shaft, so that a bridge plug rubber cylinder and dissolved residues on the casing wall are peeled off; the soluble ball is thrown in to push the dispersed and detained residues in the shaft to a fractured well section of the toe part, so that the problems that the conventional ignition releasing soluble bridge plug cannot be completely dissolved in a stratum with lower temperature, a bridge plug rubber sleeve and the residues still can be located on the wall of a casing to influence the normal pumping of a subsequent bridge shooting tool, the labor intensity is high, the cost is high and the risk is large are solved.

Description

Method for quickly removing soluble bridge plug in case of blocking
Technical Field
The invention belongs to the technical field of oil extraction in oil fields, and particularly relates to a method for quickly removing a soluble bridge plug in case of blockage.
Background
For fracturing modification of a horizontal well with a compact reservoir, a smooth casing fracturing process combining soluble bridge plugs and multiple clusters of perforation is adopted in the existing main body, the technology is totally mature, and the technology is popularized and applied to 2000 sections of 100 horizontal wells in the year by taking an Ordos basin as an example. Under the influence of adverse factors such as fluctuation of a horizontal section well track, smoothness of a shaft, change of pumping pressure of the bridge plug and the like, the soluble bridge plug can be blocked, blocked and the like in advance in the pumping process of the soluble bridge plug, so that the soluble bridge plug cannot move up and down and is forced to stop construction. At present, the soluble bridge plug is usually released by ignition, then KCl solution (1%) is pumped in, and the well is closed for several days (10-15 days) to make the bridge plug dissolve by itself. However, in a formation with a lower temperature, the method often cannot completely dissolve the bridge plug, the bridge plug rubber sleeve and the dissolved residues still can be located on the casing wall to influence the normal pumping of a subsequent bridge shooting tool, and the normal pumping can be removed by generally adopting a conventional oil pipe + milling drilling tool or a continuous oil pipe + milling drilling tool to perform drilling and milling, but the treatment scheme has the following problems: for a conventional oil pipe and a milling drilling tool, firstly, the derrick needs to be erected again when the oil pipe is lowered, the labor intensity is high, the consumed time is long, and the overall processing time exceeds 20 days; secondly, in the process of milling, the liquid entering the ground of the pressed well section can return to the stratum when the well mouth is opened, which is not beneficial to safety, environmental protection and stable production of the oil well. For coiled tubing and a milling drilling tool, firstly, for a horizontal well with a large water sag, the coiled tubing can have a self-locking phenomenon; secondly, the treatment cost of the continuous oil pipe is high, and the single cost is 30-50 ten thousand yuan; thirdly, the drill jamming is not easy to remove when the coiled tubing is drilled and ground, and the risk of underground accidents is extremely high.
Disclosure of Invention
The invention provides a method for quickly removing a soluble bridge plug in case of blockage, which aims to overcome the defects that in the prior art, for a conventional oil pipe and a milling drilling tool: firstly, the derrick needs to be erected again when the oil pipe is lowered, the labor intensity is high, the consumed time is long, and the overall processing time exceeds 20 days; secondly, in the milling process, the ground entering liquid of the pressed well section returns to the stratum when the well mouth is opened, which is not beneficial to the safety and environmental protection and the stable production of the oil well; second, overcome among the prior art to coiled tubing + milling drilling tool: firstly, for a horizontal well with a large water sag, a self-locking phenomenon of a coiled tubing occurs; secondly, the treatment cost of the continuous oil pipe is high, and the single cost is 30-50 ten thousand yuan; thirdly, the drill jamming is not easy to remove when the coiled tubing is drilled and ground, and the risk of underground accidents is very high.
Therefore, the invention provides a method for quickly removing a soluble bridge plug from an obstruction card, which comprises the following steps:
1) injecting clear water into the well head, then injecting accelerated dissolution liquid slug, and finally injecting clear water, stopping the pump and shutting down the well after the accelerated dissolution liquid slug meets the position of the soluble bridge plug and the position of the position is blocked, wherein the well shutting down time is 1-2 hours, and the injection displacement of the accelerated dissolution liquid slug is 1.0-2.0m3Min, volume of accelerated dissolution liquid slug is 1-2m3；
2) Injecting clear water at a well mouth, replacing the soluble bridge plug with the dissolution accelerating liquid slug in the step 1), stopping the pump and shutting down the well after the soluble bridge plug meets the blocking position, wherein the well shutting down time is 0.5-1.0 hour, and the injection displacement of the clear water is 1.0-2.0m3/min；
3) Repeating the steps 1) to 2) for 3-5 times, so that the dissolving solution positioned when the soluble bridge plug meets the blocking card is alternately replaced in the accelerated dissolving solution slug and the clear water;
4) injecting a sand-carrying fluid slug into a wellhead to polish the casing wall of the shaft, so that a bridge plug rubber cylinder on the casing wall and the dissolved residue in the step 3) are peeled off, wherein the injection displacement of the sand-carrying fluid slug is 4.0-6.0m3Min, the number of sand carrying liquid slugs is 3-5;
5) putting soluble balls at a wellhead, and pushing dissolved residues dispersed and retained in the shaft in the step 4) to a fractured well section of the toe part to ensure that the shaft of the well section which is not operated at the heel part is smooth and clean; the soluble ball is 2.0-3.0m3A displacement pump of/min;
6) and pumping by lowering a soluble bridge plug and a multi-cluster perforation tool again to perform fracturing construction of the target well section.
The dissolution accelerating solution in the step 1) is a KCl solution with the concentration of 1-5%.
The dosage of the sand-carrying fluid slug in the step 4) is 20.0-30.0m3The specification of the sand is 20-40 meshes, and the sand concentration is 150Kg/m3。
The sand-carrying liquid slug is carried by guanidine gum liquid, and the guanidine gum liquid comprises the following components in percentage by mass: 0.2 percent of guanidine gum, 0.35 percent of additive and the balance of water, wherein the additive is K2CO3、KHCO3、Na2CO3One or a combination of several of them.
The diameter of the soluble ball in the step 5) is phi 100 mm-phi 140 mm.
The properties of the soluble spheres are: the density is 2.0-2.3g/cm3The product can be dissolved in KCl-containing electrolyte solution for no more than 20 days, and has a temperature resistance of more than 150 ℃ and a compressive strength of more than 70 MPa.
The soluble ball comprises the following chemical components in percentage by mass: mg: 30-85%, Al: 13-25%, Zn: 2-15%, Fe: 0.1-5%, Cu: 0.05-5%, Ni: 0.05-5%, Ag: 0.05-5%, Zr: 0.05 to 0.5%, Ti: 0.05-0.5 percent.
The number of soluble balls is 1.
The sand is quartz sand.
The invention has the beneficial effects that: the invention provides a method for quickly removing a soluble bridge plug from an obstruction card, which comprises the following steps:
1) injecting clear water into the well mouth, then injecting accelerated dissolution liquid slug, and finally injecting clear water, stopping the pump to shut down the well after the accelerated dissolution liquid slug is blocked by the soluble bridge plug, wherein the shut-down time is 1-2 hours, and the injection displacement of the accelerated dissolution liquid slug is 1.0-2.0m3Min, volume of accelerated dissolution liquid slug is 1-2m3；
2) Injecting clear water at a well mouth, replacing the soluble bridge plug with the dissolution accelerating liquid slug in the step 1), stopping the pump and shutting down the well after the soluble bridge plug meets the blocking position, wherein the well shutting down time is 0.5-1.0 hour, and the injection displacement of the clear water is 1.0-2.0m3/min；
3) Repeating the steps 1) to 2) for 3-5 times, so that the dissolving solution positioned when the soluble bridge plug meets the blocking card is alternately replaced in the accelerated dissolving solution slug and the clear water;
4) injecting sand-carrying fluid slug into the wellhead to polish the casing wall of the shaft, so that the bridge plug rubber cylinder on the casing wall and the step 3) The injection displacement of the sand-carrying liquid slug is 4.0-6.0m3Min, the number of sand carrying liquid slugs is 3-5;
5) putting soluble balls at a wellhead, and pushing dissolved residues dispersed and retained in the shaft in the step 4) to a fractured well section of the toe part to ensure that the shaft of the well section which is not operated at the heel part is smooth and clean; the soluble ball is 2.0-3.0m3A displacement pump of/min;
6) and pumping by lowering a soluble bridge plug and a multi-cluster perforation tool again to perform fracturing construction of the target well section.
Has the following beneficial effects:
1) on the premise of not opening a well head and not putting a grinding and milling pipe column, the labor intensity of workers can be greatly reduced only by operating at the well head to be pressed;
2) the soluble bridge plug can be quickly removed, the well can be smoothly cleaned after removal, the subsequent bridge injection pumping and the operation are smooth, the operation time is only 4-6 days, and the operation time can be shortened by 14-16 days compared with that of a vertical derrick and a lower grinding and milling drilling tool;
3) the implementation cost is low, and the device only comprises 5-10m3Accelerated dissolution solution, 1-2m3The operation cost of the quartz sand and 1 soluble ball is not more than 5000 yuan, and the quartz sand and the 1 soluble ball can be saved by 4-5 ten thousand yuan compared with a vertical derrick and a lower grinding and milling drilling tool and can be saved by more than 30 ten thousand yuan compared with a continuous oil pipe;
4) the well head is waited to press the operation, need not to open the well head, can make the income ground liquid of the well section that has fractured earlier stage detain in the stratum complementary energy, be favorable to safe environmental protection and oil well steady production.
The method is cumulatively applied for 12 wells in the Ordos basin when the compact oil-soluble bridge plug meets the horizontal well, the effective rate is 100 percent, the average single well removing time is only 5 days, the method shortens 15 days compared with the manual treatment method of a vertical derrick and a lower grinding milling drilling tool, and saves 35 ten thousand yuan compared with continuous oil pipe drilling.
Detailed Description
Example 1:
a method for quickly removing a soluble bridge plug from an occlusion card comprises the following steps:
1) clean water is injected into the well mouth firstly, then the accelerating dissolving liquid slug is injected,finally, clear water is injected again, the pump is stopped and the well is shut down after the dissolving liquid slug is accelerated to the position of the soluble bridge plug and is blocked, the well shut-down time is 1 to 2 hours, and the injection displacement of the dissolving liquid slug is 1.0 to 2.0m3Min, volume of accelerated dissolution liquid slug is 1-2m3；
2) Injecting clear water at a well mouth, replacing the soluble bridge plug with the dissolution accelerating liquid slug in the step 1), stopping the pump and shutting down the well after the soluble bridge plug meets the blocking position, wherein the well shutting down time is 0.5-1.0 hour, and the injection displacement of the clear water is 1.0-2.0m3/min；
3) Repeating the steps 1) to 2) for 3-5 times, so that the dissolving solution positioned when the soluble bridge plug meets the blocking card is alternately replaced in the accelerated dissolving solution slug and the clear water; the soluble bridge plug is alternatively exposed in the accelerated dissolving solution and clear water, so that the aim of instantly replacing the dissolving solution near the position of the soluble bridge plug meeting the block is fulfilled, and the electrolytic reaction of the metal body of the soluble bridge plug is accelerated.
4) Injecting a sand-carrying fluid slug into a wellhead to polish the casing wall of the shaft, so that a bridge plug rubber cylinder on the casing wall and the dissolved residue in the step 3) are peeled off, wherein the injection displacement of the sand-carrying fluid slug is 4.0-6.0m3Min, the number of sand carrying liquid slugs is 3-5;
5) putting soluble balls at a wellhead, and pushing dissolved residues dispersed and retained in the shaft in the step 4) to a fractured well section of the toe part to ensure that the shaft of the well section which is not operated at the heel part is smooth and clean; the soluble ball is 2.0-3.0m3A displacement pump of/min;
6) and pumping by lowering a soluble bridge plug and a multi-cluster perforation tool again to perform fracturing construction of the target well section.
The dissolution accelerating solution in the step 1) is a KCl solution with the concentration of 1-5%.
The dosage of the sand-carrying fluid slug in the step 4) is 20.0-30.0m3The specification of the sand is 20-40 meshes, and the sand concentration is 150Kg/m3。
The sand-carrying liquid slug is carried by guanidine gum liquid, and the guanidine gum liquid comprises the following components in percentage by mass: 0.2 percent of guanidine gum, 0.35 percent of additive and the balance of water, wherein the additive is K2CO3、KHCO3、Na2CO3One or a combination of several of them.
The diameter of the soluble ball in the step 5) is phi 100 mm-phi 140 mm.
The properties of the soluble spheres are: the density is 2.0-2.3g/cm3The product can be dissolved in KCl-containing electrolyte solution for no more than 20 days, and has a temperature resistance of more than 150 ℃ and a compressive strength of more than 70 MPa.
The soluble ball comprises the following chemical components in percentage by mass: mg: 30-85%, Al: 13-25%, Zn: 2-15%, Fe: 0.1-5%, Cu: 0.05-5%, Ni: 0.05-5%, Ag: 0.05-5%, Zr: 0.05 to 0.5%, Ti: 0.05-0.5 percent.
The number of soluble balls is 1.
The sand is quartz sand.
The invention designs a method for quickly removing a soluble bridge plug from an obstruction card, which has the following beneficial effects:
1) on the premise of not opening a well head and not putting a grinding and milling pipe column, the labor intensity of workers can be greatly reduced only by operating at the well head to be pressed;
2) the soluble bridge plug can be quickly removed, the well can be smoothly cleaned after removal, the subsequent bridge injection pumping and the operation are smooth, the operation time is only 4-6 days, and the operation time can be shortened by 14-16 days compared with that of a vertical derrick and a lower grinding and milling drilling tool;
3) the implementation cost is low, and the device only comprises 5-10m3Accelerated dissolution solution, 1-2m3The operation cost of the quartz sand and 1 soluble ball is not more than 5000 yuan, and the quartz sand and the 1 soluble ball can be saved by 4-5 ten thousand yuan compared with a vertical derrick and a lower grinding and milling drilling tool and can be saved by more than 30 ten thousand yuan compared with a continuous oil pipe;
4) the well head is in pressure waiting operation without opening the well head, so that the ground entering liquid of the fractured well section in the early stage can be retained in the stratum to supplement energy, and the safety, environmental protection and stable production of an oil well are facilitated.
The method is cumulatively applied for 12 wells in the Ordos basin when the compact oil-soluble bridge plug meets the horizontal well, the effective rate is 100 percent, the average single well removing time is only 5 days, the method shortens 15 days compared with the manual treatment method of a vertical derrick and a lower grinding milling drilling tool, and saves 35 ten thousand yuan compared with continuous oil pipe drilling.
Example 2:
a method for quickly removing a soluble bridge plug from an occlusion card comprises the following steps:
1) injecting clear water into the well mouth, then injecting accelerated dissolution liquid slug, and finally injecting clear water, stopping the pump and shutting down the well after the accelerated dissolution liquid slug meets the position of the soluble bridge plug when meeting the blocking position, wherein the injection displacement of the accelerated dissolution liquid slug is 2.0m3Min, volume of accelerated dissolution slug is 2m3(ii) a The accelerated dissolution solution is a KCl solution with the concentration of 1%.
2) Injecting clean water at a well mouth, replacing the soluble bridge plug with the dissolution accelerating liquid slug in the step 1), stopping the pump and shutting down the well after the soluble bridge plug meets the blocking position, wherein the well shutting down time is 1.0 hour, and the injection displacement of the clean water is 2.0m3/min；
3) Repeating the steps 1) to 2) for 3 times, so that the dissolving solution positioned at the position of the soluble bridge plug when meeting the blocking card is alternately replaced in the accelerated dissolving solution slug and clear water;
4) injecting a sand-carrying fluid slug into a wellhead to polish the casing wall of the shaft, so that a bridge plug rubber cylinder on the casing wall and the dissolved residue in the step 3) are peeled off, wherein the injection displacement of the sand-carrying fluid slug is 6.0m3Min, the number of sand carrying liquid slugs is 5; the dosage of the sand-carrying liquid slug is 20.0m3The specification of the quartz sand is 20-40 meshes, and the sand concentration is 120Kg/m3(ii) a The sand-carrying liquid slug is carried by guanidine gum liquid, and the guanidine gum liquid comprises the following components in percentage by mass: 0.2 percent of guanidine gum, 0.35 percent of additive and the balance of water, wherein the additive is K2CO3、KHCO3、Na2CO3One or a combination of more of the above;
5) putting soluble balls at a wellhead, and pushing dissolved residues dispersed and retained in the shaft in the step 4) to a fractured well section of the toe part to ensure that the shaft of the well section which is not operated at the heel part is smooth and clean; the soluble ball is at 3.0m3A displacement pump of/min; the diameter of the soluble ball in the step 5) is phi 100 mm; the properties of the soluble spheres are: the density was 2.0g/cm3The solution can be dissolved in an electrolyte solution containing KCl for no more than 20 days, and the temperature resistance is higher than 150 ℃, and the compressive strength is higher than 70 MPa; chemical composition and quality of said soluble ballThe weight percentage content is as follows: mg: 30%, Al: 13%, Zn: 2%, Fe: 0.1%, Cu: 0.05%, Ni: 0.05%, Ag: 0.05%, Zr: 0.05%, Ti: 0.05 percent; the number of the soluble balls is 1;
6) and pumping by lowering a soluble bridge plug and a multi-cluster perforation tool again to perform fracturing construction of the target well section.
The invention designs a method for quickly removing a soluble bridge plug from an obstruction card, which has the following beneficial effects:
1) on the premise of not opening a well head and not putting a grinding and milling pipe column, the labor intensity of workers can be greatly reduced only by operating at the well head to be pressed;
2) the soluble bridge plug can be quickly removed, the well can be smooth and clean after removal, the subsequent bridge injection pumping and operation are smooth, the operation time is only 6 days, and the operation time can be shortened by 16 days compared with that of a vertical derrick and a lower grinding and milling drilling tool;
3) the implementation cost is low, and only comprises 6m3The dissolving liquid, the quartz sand and the 1 soluble ball are accelerated, the operation cost is not more than 5000 yuan, and the drilling and milling device can save 5 ten thousand yuan compared with a vertical derrick and a lower grinding and milling drilling tool and can save 40 ten thousand yuan compared with a continuous oil pipe;
4) the well head is waited to press the operation, need not to open the well head, can make the income ground liquid of the well section that has fractured earlier stage detain in the stratum complementary energy, be favorable to safe environmental protection and oil well steady production.
The method is cumulatively applied for 12 wells in the Ordos basin when the compact oil-soluble bridge plug meets the horizontal well, the effective rate is 100 percent, the average single well removing time is only 5 days, the method shortens 15 days compared with the manual treatment method of a vertical derrick and a lower grinding milling drilling tool, and saves 40 ten thousand yuan compared with continuous oil pipe drilling.
Example 3:
a method for quickly removing a soluble bridge plug from an occlusion card comprises the following steps:
1) firstly injecting clear water into a well mouth, then injecting an accelerated dissolution liquid slug, and finally injecting clear water, stopping a pump and shutting down the well after the accelerated dissolution liquid slug meets a position of a soluble bridge plug and is blocked, wherein the well shutting down time is 1.5 hours, and the injection displacement of the accelerated dissolution liquid slug is 1.5m3Min, accelerated dissolution of liquid slugProduct of 1.5m3(ii) a The accelerated dissolution solution is a KCl solution with the concentration of 3%.
2) Injecting clear water at a well mouth, replacing the soluble bridge plug with the dissolution accelerating liquid slug in the step 1), stopping the pump and shutting down the well after the soluble bridge plug meets the blocking position, wherein the well shutting down time is 7.5 hours, and the injection displacement of the clear water is 1.5m3/min；
3) Repeating the steps 1) to 2) for 4 times, so that the dissolving solution positioned when the soluble bridge plug meets the blocking card is alternately replaced in the accelerated dissolving solution slug and the clear water;
4) injecting a sand-carrying fluid slug into a wellhead to polish the casing wall of the shaft, so that a bridge plug rubber cylinder on the casing wall and the dissolved residue in the step 3) are peeled off, wherein the injection displacement of the sand-carrying fluid slug is 5.0m3Min, the number of sand carrying liquid slugs is 4; the dosage of the sand-carrying liquid slug is 25.0m3The specification of the quartz sand is 30 meshes, and the sand concentration is 135Kg/m3(ii) a The sand-carrying liquid slug is carried by guanidine gum liquid, and the guanidine gum liquid comprises the following components in percentage by mass: 0.2 percent of guanidine gum, 0.35 percent of additive and the balance of water, wherein the additive is K2CO3、KHCO3、Na2CO3One or a combination of more of the above;
5) putting soluble balls at a wellhead, and pushing dissolved residues dispersed and retained in the shaft in the step 4) to a fractured well section of the toe part to ensure that the shaft of the well section which is not operated at the heel part is smooth and clean; the soluble ball is 2.5m3A displacement pump of/min; the diameter of the soluble ball in the step 5) is phi 118 mm; the properties of the soluble spheres are: the density was 2.2g/cm3The solution can be dissolved in an electrolyte solution containing KCl for no more than 20 days, and the temperature resistance is higher than 150 ℃, and the compressive strength is higher than 70 MPa; the soluble ball comprises the following chemical components in percentage by mass: mg: 58%, Al: 19%, Zn: 8.5%, Fe: 2.5%, Cu: 2.02%, Ni: 2.02%, Ag: 2.02%, Zr: 0.27%, Ti: 0.27 percent; the number of the soluble balls is 1;
6) and pumping by lowering a soluble bridge plug and a multi-cluster perforation tool again to perform fracturing construction of the target well section.
The invention designs a method for quickly removing a soluble bridge plug from an obstruction card, which has the following beneficial effects:
1) on the premise of not opening a well head and not putting a grinding and milling pipe column, the labor intensity of workers can be greatly reduced only by operating at the well head to be pressed;
2) the soluble bridge plug can be quickly removed, the well can be smooth and clean after removal, the subsequent bridge injection pumping and operation are smooth, the operation time is only 4 days, and the operation time can be shortened by 16 days compared with that of a vertical derrick and a lower grinding and milling drilling tool;
3) the implementation cost is low, and only comprises 6m3The operation cost does not exceed 5000 yuan due to the fact that the dissolving liquid, the quartz sand and the 1 soluble ball are accelerated, 7 ten thousand yuan can be saved compared with a vertical derrick and a lower grinding and milling drilling tool, and 38 ten thousand yuan can be saved compared with a continuous oil pipe drilling and milling tool;
4) the well head is waited to press the operation, need not to open the well head, can make the income ground liquid of the well section that has fractured earlier stage detain in the stratum complementary energy, be favorable to safe environmental protection and oil well steady production.
The method is cumulatively applied for 12 wells in the Ordos basin when the compact oil-soluble bridge plug meets the horizontal well, the effective rate is 100 percent, the average single well removing time is only 5 days, the method shortens 15 days compared with the manual treatment method of a vertical derrick and a lower grinding milling drilling tool, and saves 38 ten thousand yuan compared with continuous oil pipe drilling.
Example 4:
a method for quickly removing a soluble bridge plug from an occlusion card comprises the following steps:
1) injecting clear water into the well mouth, then injecting accelerated dissolution liquid slug, and finally injecting clear water, stopping the pump and shutting down the well after the accelerated dissolution liquid slug meets the position of the soluble bridge plug when meeting the blocking position, wherein the injection displacement of the accelerated dissolution liquid slug is 1.0m3Min, volume of accelerated dissolution slug is 1m3(ii) a The accelerated dissolution solution is a KCl solution with the concentration of 5%.
2) Injecting clear water at a well mouth, replacing the soluble bridge plug with the dissolution accelerating liquid slug in the step 1), stopping the pump and shutting down the well after the soluble bridge plug meets the blocking position, wherein the well shutting down time is 0.5 hour, and the injection displacement of the clear water is 1.0m3/min；
3) Repeating the steps 1) to 2) for 5 times, so that the dissolving solution positioned when the soluble bridge plug meets the blocking card is alternately replaced in the accelerated dissolving solution slug and the clear water;
4) injecting a sand-carrying fluid slug into a wellhead to polish the casing wall of the shaft, so that a bridge plug rubber cylinder on the casing wall and the dissolved residue in the step 3) are peeled off, wherein the injection displacement of the sand-carrying fluid slug is 4.0m3Min, the number of sand carrying liquid slugs is 3; the dosage of the sand-carrying liquid slug is 30.0m3The specification of the quartz sand is 20-40 meshes, and the sand concentration is 150Kg/m3(ii) a The sand-carrying liquid slug is carried by guanidine gum liquid, and the guanidine gum liquid comprises the following components in percentage by mass: 0.2 percent of guanidine gum, 0.35 percent of additive and the balance of water, wherein the additive is K2CO3、KHCO3、Na2CO3One or a combination of more of the above;
5) putting soluble balls at a wellhead, and pushing dissolved residues dispersed and retained in the shaft in the step 4) to a fractured well section of the toe part to ensure that the shaft of the well section which is not operated at the heel part is smooth and clean; the soluble ball is 2.0m3A displacement pump of/min; the diameter of the soluble ball in the step 5) is phi 1 phi 140 mm; the properties of the soluble spheres are: the density was 2.3g/cm3The solution can be dissolved in an electrolyte solution containing KCl for no more than 20 days, and the temperature resistance is higher than 150 ℃, and the compressive strength is higher than 70 MPa; the soluble ball comprises the following chemical components in percentage by mass: mg: 85%, Al: 25%, Zn: 15%, Fe: 5%, Cu: 5%, Ni: 5%, Ag: 5%, Zr: 0.5%, Ti: 0.5 percent; the number of the soluble balls is 1;
6) and pumping by lowering a soluble bridge plug and a multi-cluster perforation tool again to perform fracturing construction of the target well section.
The invention designs a method for quickly removing a soluble bridge plug in case of blockage, which has the following beneficial effects:
1) on the premise of not opening a well head and not putting a grinding and milling pipe column, the labor intensity of workers can be greatly reduced only by operating at the well head to be pressed;
2) the soluble bridge plug can be quickly removed, the well can be smooth and clean after removal, the subsequent bridge injection pumping and operation are smooth, the operation time is only 4 days, and the operation time can be shortened by 14 days compared with that of a vertical derrick and a lower grinding and milling drilling tool;
3) the implementation cost is low, and only comprises 5m3The dissolving liquid, the quartz sand and the 1 soluble ball are accelerated, the operation cost is not more than 5000 yuan, 4 ten thousand yuan can be saved compared with a vertical derrick and a lower grinding and milling drilling tool, and 35 ten thousand yuan can be saved compared with a continuous oil pipe drilling and milling tool;
4) the well head is waited to press the operation, need not to open the well head, can make the income ground liquid of the well section that has fractured earlier stage detain in the stratum complementary energy, be favorable to safe environmental protection and oil well steady production.
The method is cumulatively applied for 12 wells in the Ordos basin when the compact oil-soluble bridge plug meets the horizontal well, the effective rate is 100 percent, the average single well removing time is only 5 days, the method shortens 15 days compared with the manual treatment method of a vertical derrick and a lower grinding milling drilling tool, and saves 35 ten thousand yuan compared with continuous oil pipe drilling.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention.

Claims (8)

1. A method for quickly removing a soluble bridge plug from an obstruction card is characterized by comprising the following steps: the method comprises the following steps:
1) injecting clear water into the well head, then injecting accelerated dissolution liquid slug, and finally injecting clear water, stopping the pump and shutting down the well after the accelerated dissolution liquid slug meets the position of the soluble bridge plug and the position of the position is blocked, wherein the well shutting down time is 1-2 hours, and the injection displacement of the accelerated dissolution liquid slug is 1.0-2.0m3Min, volume of accelerated dissolution liquid slug is 1-2m3；
2) Injecting clear water at a well mouth, replacing the soluble bridge plug with the dissolution accelerating liquid slug in the step 1), stopping the pump and shutting down the well after the soluble bridge plug is blocked, wherein the well shutting down time is 0.5-1.0 hour, and the injection displacement of the clear water in the step 2) is 1.0-2.0m3/min；
3) Repeating the steps 1) to 2) for 3-5 times, so that the dissolving solution positioned when the soluble bridge plug meets the blocking card is alternately replaced in the accelerated dissolving solution slug and the clear water;
4) injecting a sand-carrying fluid slug into the wellhead to polish the casing wall of the shaft, so that the bridge plug rubber cylinder on the casing wall and the dissolved residue in the step 3) are peeled off, and the methodThe injection displacement of the sand-carrying liquid slug is 4.0-6.0m3Min, the number of sand carrying liquid slugs is 3-5;
5) putting soluble balls at a wellhead, and pushing dissolved residues dispersed and retained in the shaft in the step 4) to a fractured well section of the toe part to ensure that the shaft of the well section which is not operated at the heel part is smooth and clean; the soluble ball is 2.0-3.0m3A displacement pump of/min;
6) and pumping by lowering a soluble bridge plug and a multi-cluster perforation tool again to perform fracturing construction of the target well section.
2. The method of claim 1 for the rapid removal of a soluble bridge plug encounter card, wherein: the dissolution accelerating solution in the step 1) is a KCl solution with the concentration of 1-5%.
3. The method of claim 2 for the rapid removal of a soluble bridge plug encounter card, wherein: the dosage of the sand-carrying fluid slug in the step 4) is 20.0-30.0m3The specification of the sand is 20-40 meshes, and the sand concentration is 150Kg/m3。
4. The method of claim 3 for the rapid removal of a soluble bridge plug encounter card, wherein: the sand-carrying liquid slug is carried by guanidine gum liquid, and the guanidine gum liquid comprises the following components in percentage by mass: 0.2 percent of guanidine gum, 0.35 percent of additive and the balance of water, wherein the additive is K2CO3、KHCO3、Na2One or a combination of more of CO 3.
5. The method of claim 4 for rapid removal of a soluble bridge plug encounter card, wherein: the diameter of the soluble ball in the step 5) is phi 100 mm-phi 140 mm.
6. The method of claim 5 for the rapid removal of a soluble bridge plug encounter card, wherein: the properties of the soluble spheres are: the density is 2.0-2.3g/cm3Temperature resistance of more than 150 ℃, compressive strength of more than 70MPa, dissolubility and no more than 20 percent in KCl-containing electrolyte solutionAnd (5) day.
7. The method of claim 6 for the rapid removal of a soluble bridge plug encounter card, wherein: the number of soluble balls is 1.
8. The method of claim 7 for the rapid removal of a soluble bridge plug encounter card, wherein: the sand is quartz sand.
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CN111826147B (en) * 2020-07-14 2022-08-26 东方宝麟科技发展(北京)有限公司 Soluble bridge plug cosolvent for horizontal well fracturing and soluble bridge plug dissolution assisting process

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203394493U (en) * 2013-07-05 2014-01-15 中国石油天然气股份有限公司 Fracturing process pipe column with soluble bridge plug
CN104564003A (en) * 2014-12-23 2015-04-29 中国石油天然气股份有限公司 Drilling-plug-free pumping-in hydraulic bridge plug staged fracturing method
CN104989358A (en) * 2015-06-18 2015-10-21 中国石油化工股份有限公司华东分公司采油厂 Shale gas horizontal well bridge plug separation and ball throwing segmented fracturing process
CN105840166A (en) * 2016-04-19 2016-08-10 中石化重庆涪陵页岩气勘探开发有限公司 Horizontal well fracturing gas testing and well completion technology adopting completely dissoluble bridge plug
CN106244125A (en) * 2016-08-26 2016-12-21 中国石油集团渤海钻探工程有限公司 Unfreezing for the solid stuck glue part of down-hole bridging plug/packer disappears solvent
CN106437614A (en) * 2016-10-18 2017-02-22 中国石油集团长城钻探工程有限公司 Horizontal well full-bore soluble degradable fracturing bridge plug
CN107724995A (en) * 2017-11-28 2018-02-23 西安石油大学 A kind of mechanical-set half dissolving bridging device and its fracturing process

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120043085A1 (en) * 2010-08-19 2012-02-23 Schlumberger Technology Corporation Wellbore service fluid and methods of use

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203394493U (en) * 2013-07-05 2014-01-15 中国石油天然气股份有限公司 Fracturing process pipe column with soluble bridge plug
CN104564003A (en) * 2014-12-23 2015-04-29 中国石油天然气股份有限公司 Drilling-plug-free pumping-in hydraulic bridge plug staged fracturing method
CN104989358A (en) * 2015-06-18 2015-10-21 中国石油化工股份有限公司华东分公司采油厂 Shale gas horizontal well bridge plug separation and ball throwing segmented fracturing process
CN105840166A (en) * 2016-04-19 2016-08-10 中石化重庆涪陵页岩气勘探开发有限公司 Horizontal well fracturing gas testing and well completion technology adopting completely dissoluble bridge plug
CN106244125A (en) * 2016-08-26 2016-12-21 中国石油集团渤海钻探工程有限公司 Unfreezing for the solid stuck glue part of down-hole bridging plug/packer disappears solvent
CN106437614A (en) * 2016-10-18 2017-02-22 中国石油集团长城钻探工程有限公司 Horizontal well full-bore soluble degradable fracturing bridge plug
CN107724995A (en) * 2017-11-28 2018-02-23 西安石油大学 A kind of mechanical-set half dissolving bridging device and its fracturing process

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
可溶桥塞在南川页岩气田的应用研究;夏海帮;《油气藏评价与开发》;20190831;第9卷(第4期);第79-83页 *

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