CN114961638B - Supermolecule gel-low-temperature high-strength gel casing damage sand-fixing plugging method - Google Patents
Supermolecule gel-low-temperature high-strength gel casing damage sand-fixing plugging method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000002002 slurry Substances 0.000 claims abstract description 54
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 238000004140 cleaning Methods 0.000 claims abstract description 25
- 238000005553 drilling Methods 0.000 claims abstract description 25
- 239000004576 sand Substances 0.000 claims abstract description 22
- 230000000694 effects Effects 0.000 claims abstract description 11
- 239000012530 fluid Substances 0.000 claims abstract description 10
- 238000005406 washing Methods 0.000 claims abstract description 7
- 238000002360 preparation method Methods 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims abstract description 6
- 125000006850 spacer group Chemical group 0.000 claims abstract description 3
- 238000003756 stirring Methods 0.000 claims description 38
- 239000007788 liquid Substances 0.000 claims description 17
- 238000006073 displacement reaction Methods 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 230000008021 deposition Effects 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 6
- 230000008719 thickening Effects 0.000 abstract description 5
- 230000009471 action Effects 0.000 abstract description 3
- 238000007711 solidification Methods 0.000 abstract 1
- 230000008023 solidification Effects 0.000 abstract 1
- 239000003208 petroleum Substances 0.000 description 10
- 230000006872 improvement Effects 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 7
- 229910052500 inorganic mineral Inorganic materials 0.000 description 5
- 239000011707 mineral Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000012752 auxiliary agent Substances 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 238000011010 flushing procedure Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
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- 238000007596 consolidation process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
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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
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/516—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls characterised by their form or by the form of their components, e.g. encapsulated material
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B29/10—Reconditioning of well casings, e.g. straightening
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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Abstract
The invention discloses a supermolecule gel-low temperature high strength gel sleeve damage sand-fixing and plugging method, which comprises the following steps: firstly, sand washing and drilling down to the bottom of a sleeve damage point and cleaning a borehole, then sequentially injecting a pad fluid, a spacer fluid, a post-cleaning fluid and clear water into a well and standing, then preparing low-temperature high-strength gel plugging slurry, injecting the low-temperature high-strength gel plugging slurry into the well for sand fixation and plugging, and finally, cleaning construction equipment and observing sealing effects after the low-temperature high-strength gel plugging slurry is waiting for solidification; the invention directly extrudes and injects supermolecular gel to enable the supermolecular gel to react with stratum water and form high-concentration and high-strength gel under the action of airflow disturbance, and can be coalesced and detained near the casing damage to achieve better detention and water-proof effects, and support is provided for injecting low-temperature high-strength gel at the back, meanwhile, the low-temperature high-strength gel prepared by the method has the characteristics of simple preparation, controllable thickening time, low density and easy detention, thereby improving the treatment effect of the casing damage well on the whole.
Description
Technical Field
The invention relates to the technical field of petroleum exploitation, in particular to a supermolecule gel-low-temperature high-strength gel sleeve damage sand-fixing and plugging method.
Background
Petroleum is a fluid mineral buried in the ground, and initially, oil-like liquid minerals produced in nature are called petroleum, combustible gas is called natural gas, solid combustible oil minerals are called asphalt, and as the research of these minerals proceeds, it is recognized that these minerals are all hydrocarbon compounds in composition and are related in origin, so that they are collectively called petroleum, and petroleum exploitation refers to the action of excavating and extracting petroleum in places where petroleum is stored.
In the petroleum exploitation process, with the increase of the exploitation life of multi-oil-layer oil fields and the influence of geological conditions and engineering factors, the phenomena of casing damage and fluid blowby outside the casing often occur, all main oil field developments in China currently enter the middle and later stages, the number of casing damage wells and the casing damage degree are synchronously increased, the casing damage becomes one of important factors affecting the normal operation of the petroleum industry in China, the number of casing damage wells is increased year by year, a plurality of concentrated casing damage areas are caused, the development well pattern is imperfect, the great loss of oil field assets is caused, the normal production of the oil fields is seriously affected, the casing damage well repair rate is low, the proportion of difficult and complicated wells is high, and the repair difficulty is increased.
At present, common casing damage well treatment modes comprise a small casing cementing process, a chemical plugging technology, a casing patch technology and a casing replacement technology, wherein the small casing cementing process sacrifices the inner diameter of a shaft, the chemical plugging technology has lower pressure test, the old well plugging operation cannot be met, the casing patch technology has reduced inner diameter, the implementation of a well completion technology is limited, the casing replacement technology has long construction period and higher cost, and therefore, the traditional casing damage well treatment modes have certain defects.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a supermolecule gel-low-temperature high-strength gel casing damage sand-fixing and plugging method, which solves the problems that the casing damage well treatment mode in the existing petroleum exploitation process is low in pressure test, cannot meet the old well plugging operation, limits the implementation of a well completion process, and is long in construction period and high in cost.
In order to achieve the purpose of the invention, the invention is realized by the following technical scheme: a supermolecule gel-low temperature high strength gel sleeve damage sand-fixing plugging method comprises the following steps:
step one: firstly, sand washing and drilling down to the bottom of a sleeve damage point, then cleaning a well hole in a large-displacement circulating cleaning mode, and then starting drilling to a wellhead;
step two: firstly, preparing enough white oil, supermolecule low-temperature high-strength gel and clear water in advance according to actual plugging requirements, then using a pump truck connecting pipeline to inject half of the white oil into a well as a front-end liquid, using a pump truck to inject supermolecule gel into the well as an isolating liquid, using the pump truck to inject the other half of the white oil into the well as a rear-end cleaning liquid, using the pump truck to inject clear water into the well, and finally closing the well and standing;
step three: preparing low-temperature high-strength gel plugging slurry in a stirring tank, then injecting the prepared low-temperature high-strength gel plugging slurry into a well after standing, and replacing the slurry with clean water after the low-temperature high-strength gel plugging slurry is completely injected;
step four: and after the slurry is replaced by clean water, cleaning a pipeline, a pump truck and residual low-temperature high-strength gel plugging slurry in a stirring tank, and after the low-temperature high-strength gel plugging slurry in a well is waiting for 12 hours, drilling a circulating plug and a drilling plug, and observing the sealing condition to obtain the plugging effect of the sleeve damage part.
The further improvement is that: in the first step, when sand washing and drilling are carried out, the sand washing and drilling are carried out until the position below the broken position of the casing, the well is cleaned, no sand deposition of the well is ensured, and the broken layer is kept exposed.
The further improvement is that: in the second step, the pump truck takes a weight of 0.2-0.4 m 3 The displacement of the liquid/min is sequentially injected into the head liquid for 0.2m 3 4m of spacer fluid 3 Post cleaning solution 0.2m 3 And clear water 0.1m 3 The concentrations of the white oil and the supramolecular gel are 100%.
The further improvement is that: in the second step, before materials are injected into the well by adopting a pump truck, all equipment is overhauled, the equipment is ensured to be intact, and the well closing and standing time is 12 hours.
The further improvement is that: in the third step, the stirring tank is a rectangular tank body, the periphery of the stirring tank is subjected to circular arc treatment, two high-power stirrers are prepared, and the high-power stirrers are stepless speed-adjustable stirrers.
The further improvement is that: in the third step, the specific preparation steps of the low-temperature high-strength gel plugging slurry are as follows: uniformly mixing the supermolecule low-temperature high-strength gel with clear water, uniformly pouring the mixture into a stirring tank, and stirring at a high speed to obtain the plugging slurry after the mixing and stirring are completed.
The further improvement is that: the clear water dosage in the preparation process of the low-temperature high-strength gel plugging slurry is 4m 3 The dosage of the supermolecule low-temperature high-strength gel is 2.8t, the concentration is 60-80%, and the density is 1.25-1.35 g/cm 3 The rotating speed of the stirring tank is 3000r/min, and the stirring time is 40-60 min.
The further improvement is that: in the third step, the displacement of the low-temperature high-strength gel plugging slurry injected into the well is 0.2m 3 The volume of the clear water slurry is 0.2m 3 。
The beneficial effects of the invention are as follows: the invention directly extrudes and injects supermolecular gel to enable the supermolecular gel to react with stratum water and form high-concentration and high-strength gel under the action of airflow disturbance, and can be coalesced and retained near the casing damage to achieve better retention and water-proof effects, and support is provided for injecting low-temperature high-strength gel at the back, meanwhile, the low-temperature high-strength gel prepared by the method has the characteristics of simple preparation, controllable thickening time, low density and easy retention, has strong compression resistance after consolidation and higher pressure test, can meet the plugging operation of an old well, has better plugging and sand-fixing effects on the casing damage sand-out well, thereby improving the treatment effect of the casing damage well on the whole, and has shorter construction period, lower cost, no reduction of the inner diameter of a casing and larger application range.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic flow chart of the method of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments that can be obtained by a person of ordinary skill in the art without making any inventive effort are within the scope of the present invention.
Example 1
Referring to fig. 1, the embodiment provides a method for blocking sand by supermolecule gel-low temperature high strength gel sleeve damage, which comprises the following steps:
step one: firstly flushing sand, drilling down to a position below a damaged position of the casing, cleaning a well hole in a large-displacement circulating cleaning mode, ensuring that the well hole has no sand deposit, keeping a damaged layer exposed, and then starting drilling to a wellhead;
step two: firstly, preparing white oil 0.4m in advance according to the actual plugging requirement 3 Supermolecule low-temperature high-strength gel 4m 3 And clear water 0.1m 3 Wherein the main agent and the auxiliary agent of the supermolecule low-temperature high-strength gel are prepared according to the proportion according to the condition of losing sand in a shaft, the main agent is self-made, the auxiliary agent is commercially available, the concentration of the white oil and the supermolecule gel is 100%, and then a pump truck is used for connecting pipelines and taking the concentration of 0.2m 3 The displacement per min will be 0.2m 3 White oil of (2) is injected into the well as a pre-liquid, and is pumped into the well by a pump truck for 4m 3 The supermolecular gel is used as isolating liquid to be injected into well, and then 0.2m of supermolecular gel is pumped by pump truck 3 Is injected into the well as a post-cleaning fluid, and then is pumped by a pump truck to 0.1m 3 Injecting clear water into the well, closing the well and standing for 12 hours, and overhauling all equipment and ensuring the equipment to be intact before injecting materials into the well;
step three: uniformly mixing low-temperature high-strength gel with clear water, uniformly pouring the mixture into a stirring tank, stirring at a high speed of 3000r/min, and mixing and stirring for 40min to obtain plugging slurry, wherein the dosage of the clear water is 4m 3 The dosage of the supermolecule low-temperature high-strength gel is 2.8t, the concentration is 60 percent, and the density is 1.25g/cm 3 Then the prepared low-temperature high-strength gel plugging slurry is mixed with the slurry of 0.2m 3 Injecting the high-strength gel plugging slurry into a well with a displacement of/min after standing, and replacing the slurry with clean water for 0.2m after the low-temperature high-strength gel plugging slurry is completely injected 3 Wherein the stirring tank is a rectangular tank body, the periphery of the stirring tank is processed by circular arcs, two high-power stirrers are prepared, and the high-power stirrers are stepless speed-adjustable stirrers;
step four: and after the slurry is replaced by clean water, cleaning a pipeline, a pump truck and residual low-temperature high-strength gel plugging slurry in a stirring tank, and after the low-temperature high-strength gel plugging slurry in a well is waiting for 12 hours, drilling a circulating plug and a drilling plug, and observing the sealing condition to obtain the plugging effect of the sleeve damage part.
Example two
Referring to fig. 1, the embodiment provides a method for blocking sand by supermolecule gel-low temperature high strength gel sleeve damage, which comprises the following steps:
step one: firstly flushing sand, drilling down to a position below a damaged position of the casing, cleaning a well hole in a large-displacement circulating cleaning mode, ensuring that the well hole has no sand deposit, keeping a damaged layer exposed, and then starting drilling to a wellhead;
step two: firstly, preparing white oil 0.4m in advance according to the actual plugging requirement 3 Supermolecule low-temperature high-strength gel 4m 3 And clear water 0.1m 3 Wherein the main agent and the auxiliary agent of the supermolecule low-temperature high-strength gel are mixed according to the proportion according to the condition of losing sand in a shaft, the concentration of the white oil and the supermolecule gel is 100 percent, and then a pump truck is used for connecting pipelines and the concentration of the white oil and the supermolecule gel is 0.3m 3 The displacement per min will be 0.2m 3 White oil of (2) is injected into the well as a pre-liquid, and is pumped into the well by a pump truck for 4m 3 The supermolecular gel is used as isolating liquid to be injected into well, and then 0.2m of supermolecular gel is pumped by pump truck 3 Is injected into the well as a post-cleaning fluid, and then is pumped by a pump truck to 0.1m 3 Injecting clear water into the well, closing the well and standing for 12 hours, and overhauling all equipment and ensuring the equipment to be intact before injecting materials into the well;
step three: uniformly mixing low-temperature high-strength gel with clear water, uniformly pouring the mixture into a stirring tank, stirring at a high speed of 3000r/min, and mixing and stirring for 50min to obtain plugging slurry, wherein the dosage of the clear water is 4m 3 The dosage of the supermolecule low-temperature high-strength gel is 2.8t, the concentration is 70 percent, and the density is 1.30g/cm 3 Then the prepared low-temperature high-strength gel plugging slurry is mixed with the slurry of 0.2m 3 Injecting the high-strength gel plugging slurry into a well with a displacement of/min after standing, and replacing the slurry with clean water for 0.2m after the low-temperature high-strength gel plugging slurry is completely injected 3 Wherein the stirring tank is a rectangular tank body, the periphery of the stirring tank is processed by circular arcs, two high-power stirrers are prepared, and the high-power stirrers are stepless speed-adjustable stirrers;
step four: and after the slurry is replaced by clean water, cleaning a pipeline, a pump truck and residual low-temperature high-strength gel plugging slurry in a stirring tank, and after the low-temperature high-strength gel plugging slurry in a well is waiting for 12 hours, drilling a circulating plug and a drilling plug, and observing the sealing condition to obtain the plugging effect of the sleeve damage part.
Example III
Referring to fig. 1, the embodiment provides a method for blocking sand by supermolecule gel-low temperature high strength gel sleeve damage, which comprises the following steps:
step one: firstly flushing sand, drilling down to a position below a damaged position of the casing, cleaning a well hole in a large-displacement circulating cleaning mode, ensuring that the well hole has no sand deposit, keeping a damaged layer exposed, and then starting drilling to a wellhead;
step two: firstly, preparing white oil 0.4m in advance according to the actual plugging requirement 3 Supermolecule low-temperature high-strength gel 4m 3 And clear water 0.1m 3 Wherein the main agent and the auxiliary agent of the supermolecule low-temperature high-strength gel are mixed according to the proportion according to the condition of losing sand in a shaft, the concentration of the white oil and the supermolecule gel is 100 percent, and then a pump truck is used for connecting pipelines and the concentration of the white oil and the supermolecule gel is 0.4m 3 The displacement per min will be 0.2m 3 White oil of (2) is injected into the well as a pre-liquid, and is pumped into the well by a pump truck for 4m 3 The supermolecular gel is used as isolating liquid to be injected into well, and then 0.2m of supermolecular gel is pumped by pump truck 3 Is injected into the well as a post-cleaning fluid, and then is pumped by a pump truck to 0.1m 3 Injecting clear water into the well, closing the well and standing for 12 hours, and overhauling all equipment and ensuring the equipment to be intact before injecting materials into the well;
step three: uniformly mixing low-temperature high-strength gel with clear water, uniformly pouring the mixture into a stirring tank, stirring at a high speed of 3000r/min, and mixing and stirring for 60min to obtain plugging slurry, wherein the dosage of the clear water is 4m 3 The dosage of the supermolecule low-temperature high-strength gel is 2.8t, the concentration is 80 percent, and the density is 1.35g/cm 3 Then the prepared low-temperature high-strength gel plugging slurry is mixed with the slurry of 0.2m 3 Injecting the high-strength gel plugging slurry into a well with a displacement of/min after standing, and replacing the slurry with clean water for 0.2m after the low-temperature high-strength gel plugging slurry is completely injected 3 Wherein the stirring tank is a rectangular tank body, the periphery of the stirring tank is processed by circular arcs, and two high-power stirrers are prepared, and the high-power stirrers are electrodelessA speed-adjustable stirrer;
step four: and after the slurry is replaced by clean water, cleaning a pipeline, a pump truck and residual low-temperature high-strength gel plugging slurry in a stirring tank, and after the low-temperature high-strength gel plugging slurry in a well is waiting for 12 hours, drilling a circulating plug and a drilling plug, and observing the sealing condition to obtain the plugging effect of the sleeve damage part.
Before the construction, the concrete is processed,
1#: firstly, adding 210g of low-temperature high-strength gel into 300ml of production water, observing thickening time under the stirring (rotating speed: 80 r/min), pouring the thickened gel into a plastic cup, and observing curing time and strength;
2#: 240g of the low-temperature high-strength gel was added to 300ml of production water, the thickening time was observed in a state of stirring (rotation speed: 80 rpm), and after thickening, the gel was poured into a plastic cup to observe the curing time and strength, and the results are shown in Table 1 below.
TABLE 1
The flow pattern and the strength of the gel with low temperature and high strength are obtained through the test before construction, so that the flow pattern and the strength are qualified.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (7)
1. The supermolecular gel-low temperature high-strength gel sleeve damage sand-fixing plugging method is characterized by comprising the following steps of:
step one: firstly, sand washing and drilling down to the bottom of a sleeve damage point, then cleaning a well hole in a large-displacement circulating cleaning mode, and then starting drilling to a wellhead;
step two: firstly, preparing enough white oil, supermolecular gel and clear water in advance according to actual plugging requirements, then using a pump truck connecting pipeline to inject half of the white oil as a front-end liquid into a well, using a pump truck to inject the supermolecular gel as an isolating liquid into the well, using the pump truck to inject the other half of the white oil as a rear-end cleaning liquid into the well, using the pump truck to inject the clear water into the well, and finally closing the well and standing;
step three: preparing low-temperature high-strength gel plugging slurry in a stirring tank, then injecting the prepared low-temperature high-strength gel plugging slurry into a well after standing, and replacing the slurry with clean water after the low-temperature high-strength gel plugging slurry is completely injected;
step four: cleaning a pipeline, a pump truck and residual low-temperature high-strength gel plugging slurry in a stirring tank by adopting clean water after slurry replacement, and after the low-temperature high-strength gel plugging slurry in a well is subjected to waiting for 12 hours, drilling a circulating plug and a drilling plug, and observing sealing conditions to obtain a plugging effect of a sleeve damage part;
in the third step, the specific preparation steps of the low-temperature high-strength gel plugging slurry are as follows: uniformly mixing the supermolecule low-temperature high-strength gel with clear water, uniformly pouring the mixture into a stirring tank, and stirring at a high speed to obtain the plugging slurry after the mixing and stirring are completed.
2. The method for lost circulation and sand-fixation by supermolecular gel-low temperature high-strength gel sleeve according to claim 1, which is characterized in that: in the first step, when sand washing and drilling are carried out, the sand washing and drilling are carried out until the position below the broken position of the casing, the well is cleaned, no sand deposition of the well is ensured, and the broken layer is kept exposed.
3. The method for lost circulation and sand-fixation by supermolecular gel-low temperature high-strength gel sleeve according to claim 1, which is characterized in that: in the second step, the pump truck takes a weight of 0.2-0.4 m 3 The displacement of the liquid/min is sequentially injected into the head liquid for 0.2m 3 4m of spacer fluid 3 Post cleaning solution 0.2m 3 And clear water 0.1m 3 The concentrations of the white oil and the supramolecular gel are 100%.
4. The method for lost circulation and sand-fixation by supermolecular gel-low temperature high-strength gel sleeve according to claim 1, which is characterized in that: in the second step, before materials are injected into the well by adopting a pump truck, all equipment is overhauled, the equipment is ensured to be intact, and the well closing and standing time is 12 hours.
5. The method for lost circulation and sand-fixation by supermolecular gel-low temperature high-strength gel sleeve according to claim 1, which is characterized in that: in the third step, the stirring tank is a rectangular tank body, the periphery of the stirring tank is subjected to circular arc treatment, two high-power stirrers are prepared, and the high-power stirrers are stepless speed-adjustable stirrers.
6. The method for lost circulation and sand-fixation by supermolecular gel-low temperature high-strength gel sleeve according to claim 1, which is characterized in that: the clear water dosage in the preparation process of the low-temperature high-strength gel plugging slurry is 4m 3 The dosage of the supermolecule low-temperature high-strength gel is 2.8t, the concentration is 60-80%, and the density is 1.25-1.35 g/cm 3 The rotating speed of the stirring tank is 3000r/min, and the stirring time is 40-60 min.
7. The method for lost circulation and sand-fixation by supermolecular gel-low temperature high-strength gel sleeve according to claim 1, which is characterized in that: in the third step, the displacement of the low-temperature high-strength gel plugging slurry injected into the well is 0.2m 3 The volume of the clear water slurry is 0.2m 3 。
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