CN111255411A - Method for plugging high-temperature well by adopting core-shell type high-temperature-resistant plugging agent - Google Patents
Method for plugging high-temperature well by adopting core-shell type high-temperature-resistant plugging agent Download PDFInfo
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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
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- 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
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
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Abstract
The invention relates to a method for plugging a high-temperature well by using a core-shell type high-temperature-resistant plugging agent, which sequentially comprises the following steps of ⑴ determining lithology, depth of a leaking layer, leakage amount and leakage speed of the drilled stratum, ⑵ m fresh water for cultivation is injected into a slurry preparation tank for cultivation at 20m, 40kg of soda and 0.8 ton of sodium bentonite are sequentially added, stirring is carried out for 2 hours and then standing is carried out for 6-24 hours to obtain base slurry, ⑶ 20 tons of the core-shell type high-temperature-resistant plugging agent is added while stirring is carried out, uniform plugging slurry is obtained by continuous stirring, ⑷ optical drilling rods are put into the well, ⑸ inspection slurry pumps and gates are carried out, ⑹ a drilling tool is put into the leaking layer, a slurry pump is started to carry out large discharge amount of the plugging slurry, ⑺ slurry is replaced and 100-130 m of the plugging slurry is kept in the drilling rods, the plugging slurry is calculated and returned to the high position, ⑻ is lifted to a safe well section, pressure test is carried out after the plugging slurry is solidified, the maximum pressure-bearing capacity is not greater than 3MPa, if ⑽ meets the requirement, and the next step of safe plugging operation is carried out.
Description
Technical Field
The invention relates to a method for plugging a high-temperature well by adopting a core-shell type high-temperature-resistant plugging agent, belonging to the technical field of petroleum drilling.
Background
In many oil fields in China, such as Tarim oil field in Xinjiang and Tahe oil field, the two-fold system generally has the leakage phenomenon, and the lithology of the two-fold system is basalt, Enhan rock and tuff of igneous rock; the chalk in Songliao basin in northeast China also has serious leakage from volcanic rocks in the volcanic ridge group. The most significant features of these losses are: the stratum is volcanic rock which is broken or fractured under the influence of geological motion, and the buried depth of the stratum is usually 3500-6000 meters, the temperature of the stratum exceeds 120 ℃, the temperature of part of areas exceeds 150 ℃, and the leakage problem is difficult to solve by the traditional leakage plugging process. The loss of a large amount of drilling fluid can cause the change of bottom hole pressure, and induce the occurrence of complex accidents such as instability of well walls, collapse, kick, blowout and the like, thereby seriously restricting the improvement of drilling speed and increasing the drilling cost.
For years, researchers in various countries have diligently researched the plugging materials aiming at the problem of drilling fluid loss under different conditions, and many novel plugging agents are developed through the popularization, so that a stout research result is obtained, and the leak-proof and plugging technology of the drilling operation is greatly developed. The common defects of the current common plugging materials are as follows: firstly, the self-deformation capability of the plugging materials in the plugging process is poor or the plugging materials basically have no deformation capability, if the used plugging materials are slightly larger than the size of the pore cracks of the leaking layer or are not matched with the shape of the pore cracks of the leaking layer, the plugging materials are difficult to penetrate into the leaking layer, and only the accumulation can be formed on the surface of the leaking layer. Secondly, the common plugging material has poor water-absorbing expansion capacity or no water-absorbing expansion property, and is difficult to stably stay in a leaking layer under the action of external force; for the reasons, when the plugging material is used for treating lost circulation, poor plugging effect or repeated loss after successful plugging is easily caused. And thirdly, the expansion amount of the plugging material is not high, the temperature resistance and salt resistance are poor under the oil field and oil reservoir conditions, the chemical stability is poor, the ageing resistance is short, and the requirements of the existing oil reservoir conditions cannot be met. The development of a novel plugging material which is suitable for complex conditions such as high temperature, high pressure, high salt-containing stratum and the like and can efficiently treat malignant leakage is a development direction of a future plugging agent.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provide a method for plugging a high-temperature well by adopting a core-shell type high-temperature-resistant plugging agent, which has the advantages of high plugging success rate, safety, reliability, temperature resistance and pressure resistance.
The method comprises the following steps of ⑴ leakage layer judgment, determining lithology of a drilled stratum according to returned rock debris, determining the depth of the leakage layer when leakage occurs, measuring leakage amount of drilling fluid, determining leakage speed by combining leakage time, ⑵ base slurry preparation, selecting a slurry preparation tank with 40m of slurry distribution, injecting 20m of fresh water for distribution, adding 40kg of soda ash through a slurry mixing hopper, adding 0.8 ton of sodium-based bentonite for drilling fluid, fully stirring for 2 hours in the slurry preparation tank to obtain base slurry, standing for 6-24 hours to obtain the base slurry, configuring the leak stopping slurry through the slurry mixing hopper, adding 20 tons of nuclear shell type high-temperature resistant leak stopping agent into the base slurry while stirring, continuing stirring to obtain the leak stopping slurry which is uniformly mixed, using a drilling tool ⑷ without tools such as a centralizer and a drilling rod, and a drilling rig, and a drilling rod into a well, checking that a normal drilling tool can be operated, checking that a high-temperature resistant leak stopping agent is not higher than a normal, checking that a slurry pump is not merged when a slurry pump is used for plugging of a leak stopping slurry, and a slurry pump, and a slurry is started to reach a pressure-bearing point of a leak stopping slurry recovery test, and a slurry for a slurry recovery test, if the slurry for plugging a leak stopping operation of a leak stopping well under a high pressure-bearing drilling rig is carried out, a high pressure-bearing slurry in a high pressure-bearing well, and a slurry storage tank, and a slurry recovery test, a slurry storage tank reaches a slurry storage tank, if no more than 355638 plugging slurry in a slurry storage tank, a slurry recovery test, a slurry.
Compared with the prior art, the method has the advantages that the core-shell type high-temperature-resistant plugging agent is added into the base slurry, the core-shell type plugging material can be coalesced at high temperature to completely plug gaps, the compressive strength of the core-shell type plugging material exceeds 4MPa, the core-shell type plugging material can completely meet the drilling construction requirements, and the core-shell type plugging material is a good material for dealing with the igneous rock leakage, in step ⑷, the underground risk can be reduced when the optical drill rod enters the well, in step ⑹, the double-pump starting can be adopted, the plugging slurry is injected in a large discharge amount, so that the plugging slurry can enter stratum gaps as soon as possible, in step ⑺, the 100-130 m plugging slurry reserved in the drill rod can make up the volume change formed by the drilling, the drilling fluid is prevented from polluting the plugging slurry at the leaking layer, in the slurry replacing process, if the well opening is not returned or the plugging slurry is returned to be 50m, the drilling can be directly carried out until the safe well section is coagulated, the pressure is.
As a preferred scheme of the invention, the leak rate determined in the step ⑴ is lower than 10 m/h and belongs to leakage, the leak rate determined in the step ⑴ belongs to medium-sized loss, the leak rate determined in the step 30-30 m/h belongs to large-sized loss, the leak rate determined in the step 50 m/h belongs to ultra-large loss, the leak rate determined in the step ⑶ also belongs to 3-5 wt% of glass fiber or ceramic fiber with the fiber length of 1-3mm for large-sized loss, the leak stopping slurry determined in the step ⑶ also belongs to 3-5 wt% of glass fiber or ceramic fiber with the fiber length of 3-10mm for large-sized loss, the pressure resistance, the crack resistance and the high-temperature stability of the leak stopping slurry can be improved by adding 3-5 wt% of glass fiber or ceramic fiber into the leak stopping slurry for large-sized loss, the fiber length is lengthened to 3-10mm for large-sized loss, but the adding amount is still maintained to 3-5 wt%.
As a preferred scheme of the invention, the step ⑶ further comprises measuring the density of the leakage stoppage slurry, calculating the equivalent density of the leakage layer according to the measured liquid level in the well and the well slurry density, and when the equivalent density of the leakage layer is higher than the density of the leakage stoppage slurry, adding barite into the leakage stoppage slurry to enable the difference ratio of the equivalent density of the leakage layer to the density of the leakage stoppage slurry to be less than 5 percent.
As a preferred scheme of the invention, in step ⑹, if the equivalent density of the leaking layer is lower than the density of the plugging slurry, the drilling tool is lowered to a position 5-10 m above the leaking layer, if the equivalent density of the leaking layer is higher than the density of the plugging slurry, the drilling tool is lowered to a position 5-10 m below the leaking layer, when the equivalent density of the leaking layer is lower than the density of the plugging slurry, the plugging slurry flows out from above the leaking layer and sinks for 5-10 m to enter the leaking layer, and when the equivalent density of the leaking layer is higher than the density of the plugging slurry, the plugging slurry flows out from below the leaking layer and floats for 5-10 m to enter the leaking layer, so that the plugging slurry quickly enters a stratum channel to play a plugging role and the waste of the plugging slurry is avoided.
As a preferred scheme of the invention, in step ⑺, if the leakage-stopping slurry returns to a height of more than 50 meters, the blowout preventer is closed, the leakage-stopping slurry is further squeezed into the stratum with small discharge capacity under the premise that the maximum pressure-holding pressure is less than 3MPa, and the leakage-stopping slurry returns to a height of more than 30 meters, after the pressure gradually returns to zero, the blowout preventer is opened, and under the condition that the distance between the top of the leakage-stopping slurry and a leakage layer is more than 50 meters, the safety coefficient is higher, the single pump can be adopted for starting, a section of leakage-stopping slurry is squeezed again with small discharge capacity, so that the length of the leakage-stopping slurry in the stratum gap is longer, the pressure-bearing capacity is better, and after squeezing, the leakage-stopping slurry returns to a height of.
As a preferred embodiment of the present invention, the level of chloride ion in the fresh water of step ⑵ is less than 500 ppm.
The high-temperature resistant plugging agent is a core-shell structure in step ⑶, the core is high-temperature resistant inorganic particles, the shell is reactive high-molecular prepolymer resin, the core comprises 100 parts of high-temperature resistant inorganic particles and 1-3 parts of surfactant, the shell comprises 100 parts of epoxy resin prepolymer, 3-8 parts of auxiliary crosslinking agent and 1-3 parts of latent curing agent, the weight ratio of the core to the shell is 100 (3-15), the high-temperature resistant inorganic particles are taken as the core, after surface activity treatment, the outer layer is coated with the reactive high-molecular prepolymer resin to form a core-shell type composite structure, the shell structure material forms stronger adsorption strength on the surface of the core structure material, after the plugging layer is injected, under the action of the stable condition of the stratum, the epoxy resin prepolymer, the auxiliary crosslinking agent and the latent curing agent can perform crosslinking reaction to form a solidification body, the plugging agent is suitable for high-temperature plugging construction, the advantages of the inorganic material, good heat resistance, good toughness of the thermosetting epoxy resin, excellent chemical stability and the self-crosslinking under the appropriate condition, and the plugging effect of plugging can be effectively realized under the high-temperature and the plugging effect of plugging can be more than 180 ℃.
As a preferable scheme of the invention, the high-temperature resistant inorganic particles are one or a mixture of more of calcium carbonate, quartz sand, glass powder and ceramic powder, the particle size of the particles is 100-800 meshes, the surface of the high-temperature resistant inorganic particles is treated by a surfactant, and the surfactant is one or more of a silane coupling agent, stearic acid, stearate or ethylene bis-stearamide. Compared with plant particles such as sawdust, cottonseed shells, walnut shells and the like, the calcium carbonate, quartz sand, glass powder and ceramic powder cannot deform at high temperature and can maintain the strength, and the core structure formed after surface activation treatment has better compatibility with epoxy resin and curing agent materials thereof serving as shell layers.
In a preferred embodiment of the present invention, the epoxy resin prepolymer is an oligomer of bisphenol a and epichlorohydrin, and the polymerization degree is 2 to 10; the auxiliary crosslinking agent is selected from toluene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate or hexamethylene diisocyanate; the latent curing agent is one of dicyandiamide, succinic acid hydrazide, isophthaloyl hydrazine or heptadecyl imidazole. The high-temperature resistant inorganic particle inner core has better compatibility with the epoxy resin composition after surface active treatment, and hydroxyl with higher reaction activity contained in the oligomer molecular chain of the bisphenol A and the epichlorohydrin has stronger adsorption capacity and adhesive property with the surface of a core structure; the epoxy resin composition containing the assistant crosslinking agent and the latent curing agent is subjected to further crosslinking reaction with the epoxy resin component at the formation temperature to finally form a consolidation body, and the consolidation body has a body type molecular structure, has strong temperature resistance and plugging strength, and is suitable for high-temperature deep well plugging construction operation.
The preparation method of the core-shell type high-temperature-resistant plugging agent comprises the following steps of preparing raw materials according to ① components and weight content, adding ② high-temperature-resistant inorganic particles into a high-speed stirrer, starting stirring and heating to 50-80 ℃, adding ③ a surfactant into the high-speed stirrer, continuing stirring at high speed for 10-20 minutes to obtain surface-activated high-temperature-resistant inorganic particles, adding ④ a cross-linking assistant agent, a latent curing agent and an epoxy resin prepolymer into the high-speed stirrer in sequence, and continuing stirring at high speed for 10-20 minutes after the addition is finished.
Detailed Description
The method for performing high-temperature well plugging by using the core-shell type high-temperature-resistant plugging agent sequentially comprises the following steps of ⑴ judging a leaking layer, determining the lithology of a drilled stratum according to returned rock debris, determining the depth of the leaking layer when the leaking occurs, measuring the leakage amount of drilling fluid, determining the leakage speed by combining the leakage time, wherein the leakage speed is less than 10m for year/h and belongs to the leakage, 10-30m for year/h and belongs to the medium-sized leakage, 30-50m for year/h and more than 50m for the ultra-large leakage.
⑵ preparation of base pulp, selecting a pulp preparation tank for carrying out fruit bearing by 40m, injecting fresh water with the chloride ion content less than 500ppm into the pulp preparation tank for carrying out fruit bearing by 20m, adding 40kg of soda ash into the pulp mixing hopper, adding 0.8 ton of sodium bentonite for drilling fluid, fully stirring the mixture in the pulp preparation tank for 2 hours, standing the mixture for more than 6 hours to obtain the base pulp, and ensuring that the sodium bentonite is fully hydrated as much as possible for 24 hours.
⑶ leakage-stopping slurry is prepared by adding 20 tons of core-shell type high-temperature-resistant leakage-stopping agent into base slurry through a slurry mixing funnel while stirring, and continuously stirring to obtain uniformly mixed leakage-stopping slurry, wherein for large-scale leakage loss, 3-5 wt% of glass fiber or ceramic fiber is also added into the leakage-stopping slurry, the fiber length is 1-3mm, and for ultra-large leakage loss, 3-5 wt% of glass fiber or ceramic fiber is also added into the leakage-stopping slurry, and the fiber length is 3-10 mm.
Measuring the density of the leaking stoppage slurry, and calculating the equivalent density of a leaking layer according to the actually measured liquid level in the well and the well slurry density; when the equivalent density of the leakage layer is higher than the density of the leakage stopping slurry, the barite is added into the leakage stopping slurry, so that the difference ratio of the equivalent density of the leakage layer and the density of the leakage stopping slurry is less than 5%.
⑷ the drill tool is without tools such as drill bit, centralizer, drill collar, etc., and the optical drill rod is put into the well.
⑸ the inspection mud pump can run normally, the inspection mud tank gate, the manifold gate are sealed effectively, do not have the cluster thick liquid phenomenon.
⑹ the drilling tool is lowered to the position 5-10 m above the leakage layer if the equivalent density of the leakage layer is lower than the density of the plugging slurry, and the drilling tool is lowered to the position 5-10 m below the leakage layer if the equivalent density of the leakage layer is higher than the density of the plugging slurry, the slurry pump is started, and the prepared plugging slurry is injected with large discharge.
⑺, sending well slurry into the drill rod through a slurry pump to replace the leaking stoppage slurry, keeping the leaking stoppage slurry with the height of 100-130 m in the drill rod, calculating the returning height position of the leaking stoppage slurry in the well hole, directly entering step ⑻ for waiting for coagulation if the well mouth has no slurry return or the leaking stoppage slurry returns to the height of less than 50m, if the returning height of the leaking stoppage slurry is more than 50m, adding the following actions in the slurry replacement operation, namely closing the blowout preventer, further extruding the leaking stoppage slurry into the stratum with small discharge capacity on the premise that the maximum blocking pressure is less than 3MPa, ensuring that the leaking stoppage slurry returns to the height of more than 30m, and opening the blowout preventer after the pressure gradually returns to zero.
⑻ the drilling tool is raised to the safe well section above the high position of the plugging slurry, and the plugging slurry enters the waiting solidification.
⑼ according to theoretical calculation and indoor test results, the solidification time is calculated, after the plugging slurry is solidified, pressure is tested, the maximum pressure bearing is not more than 3MPa, and new induced cracks are avoided.
⑽, if the pressure bearing meets the requirement, the next construction is carried out, if the pressure bearing can not meet the requirement, the plugging operation is repeated.
⑶, preparing ① raw materials according to the following components and weight contents, wherein the core is made of high-temperature-resistant inorganic particles, the shell is made of reactive polymer prepolymer resin, the core is made of 100 parts of high-temperature-resistant inorganic particles and 1-3 parts of surfactant, the shell is made of 100 parts of epoxy resin prepolymer, 3-8 parts of auxiliary crosslinking agent and 1-3 parts of latent curing agent, and the weight ratio of the core to the shell is 100 (3-15).
The high-temperature resistant inorganic particles are one or a mixture of more of calcium carbonate, quartz sand, glass powder and ceramic powder, and the particle size of the particles is 100-800 meshes; the surfactant is one or more of silane coupling agent, stearic acid, stearate or ethylene bis stearamide; the epoxy resin prepolymer is an oligomer of bisphenol A and epoxy chloropropane, and the polymerization degree is 2-10; the auxiliary crosslinking agent is selected from toluene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate or hexamethylene diisocyanate; the latent curing agent is one of dicyandiamide, succinic acid hydrazide, isophthaloyl hydrazine or heptadecyl imidazole.
② adding the high-temperature resistant inorganic particles into a high-speed stirrer, starting stirring and heating to 50-80 ℃.
③ adding surfactant into the high-speed stirrer, and stirring at high speed for 10-20 min to obtain surface-activated high-temperature-resistant inorganic particles.
④ adding the assistant crosslinking agent, the latent curing agent and the epoxy resin prepolymer into the high-speed stirrer in sequence, and continuing to stir at high speed for 10-20 minutes after the addition is finished.
The core-shell type high-temperature resistant plugging agent sample is prepared according to the method of the invention and is subjected to performance analysis. Firstly, preparing a high-temperature resistant chemical flocculation plugging agent sample according to the proportion of each component in the table 1.
TABLE 1
Firstly, evaluating the performance of the sample 1
4 parts of sodium bentonite and 0.2 part of soda ash are dissolved in 100 parts of tap water and maintained at room temperature of 25 ℃ for 24 hours to obtain the fresh water drilling fluid. Then, 60 parts, 80 parts, 100 parts, 120 parts and 140 parts of the sample 1 are respectively added into the fresh water drilling fluid and marked as a first leakage plugging slurry, a second leakage plugging slurry, a third leakage plugging slurry, a fourth leakage plugging slurry and a fifth leakage plugging slurry, then the influence of different addition amounts on the apparent viscosity and the plastic viscosity of the fresh water drilling fluid is examined, and the obtained results are shown in table 2.
TABLE 2
Then, the first to fifth plugging slurries of sample 1 were placed at 100 ℃, 120 ℃, 140 ℃, 160 ℃ and 180 ℃ respectively, and the curing time and the compressive strength after curing were examined, and the results are shown in Table 3.
TABLE 3
Second, the performance of sample 2 was evaluated
4 parts of sodium bentonite and 0.2 part of soda ash are dissolved in 100 parts of tap water and maintained at room temperature of 25 ℃ for 24 hours to obtain the fresh water drilling fluid. Then, 60 parts, 80 parts, 100 parts, 120 parts and 140 parts of the sample 2 are respectively added into the fresh water drilling fluid and marked as a first leakage plugging slurry, a second leakage plugging slurry, a third leakage plugging slurry, a fourth leakage plugging slurry and a fifth leakage plugging slurry, then the influence of different addition amounts on the apparent viscosity and the plastic viscosity of the fresh water drilling fluid is examined, and the obtained results are shown in table 4.
TABLE 4
Then, the first to fifth plugging slurries of sample 2 were placed at 100 ℃, 120 ℃, 140 ℃, 160 ℃ and 180 ℃ respectively, and the curing time and the compressive strength after curing were examined, and the results are shown in Table 5.
TABLE 5
Thirdly, the performance of the sample 3 is evaluated
4 parts of sodium bentonite and 0.2 part of soda ash are dissolved in 100 parts of tap water and maintained at room temperature of 25 ℃ for 24 hours to obtain the fresh water drilling fluid. Then, 60 parts, 80 parts, 100 parts, 120 parts and 140 parts of the sample 3 are respectively added into the fresh water drilling fluid and marked as a first leakage plugging slurry, a second leakage plugging slurry, a third leakage plugging slurry, a fourth leakage plugging slurry and a fifth leakage plugging slurry, then the influence of different addition amounts on the apparent viscosity and the plastic viscosity of the fresh water drilling fluid is examined, and the obtained results are shown in table 6.
TABLE 6
Then, the first to fifth plugging slurries of sample 3 were placed at 100 ℃, 120 ℃, 140 ℃, 160 ℃ and 180 ℃ respectively, and the curing time and the compressive strength after curing were examined, and the results are shown in Table 7.
TABLE 7
Fourthly, the performance evaluation is carried out on the sample 4
4 parts of sodium bentonite and 0.2 part of soda ash are dissolved in 100 parts of tap water and maintained at room temperature of 25 ℃ for 24 hours to obtain the fresh water drilling fluid. Then, 60 parts, 80 parts, 100 parts, 120 parts and 140 parts of the sample 4 are respectively added into the fresh water drilling fluid and marked as a first leakage plugging slurry, a second leakage plugging slurry, a third leakage plugging slurry, a fourth leakage plugging slurry and a fifth leakage plugging slurry, then the influence of different addition amounts on the apparent viscosity and the plastic viscosity of the fresh water drilling fluid is examined, and the obtained results are shown in table 8.
TABLE 8
Then, the first to fifth plugging slurries of sample 4 were placed at 100 ℃, 120 ℃, 140 ℃, 160 ℃ and 180 ℃ respectively, and the curing time and the compressive strength after curing were examined, and the results are shown in Table 9.
TABLE 9
Fifthly, evaluating the performance of the sample 3 and comparing the evaluation with the one-way pressure sealing agent
(1) Normal temperature plugging performance evaluation experiment
The experiment adopts sand bed leakage fluid loss evaluation, and adopts the comparison of the traditional one-way pressure sealant, which is abbreviated as 'single seal', with the sample 3 of the invention, wherein the 'single seal' adopts a product which meets the technical standard QSH 34500013-2013 of the traditional petrochemical industry; the "single seal" or sample 3 was measured for the same amount of addition in the base slurry and the results of the plugging performance tests are compared in table 10.
Watch 10
As can be seen from the results of the sand bed leakage and fluid loss test, the core-shell type high-temperature resistant plugging agent has the plugging performance obviously superior to that of the traditional common similar products.
(2) Evaluation of high temperature blocking resistance
The core-shell type high-temperature resistant plugging agent of the invention is subjected to aging tests for 1d, 5d, 10d and 20d at 150 ℃ respectively, and the temperature resistance is measured, and the test results show that the 1d invasion is 0.4cm, the 5d invasion is 1.0cm, the 10d invasion is 1.1cm and the 20d invasion is 1.1 cm.
The experimental result shows that the sand bed permeability is still low after the core-shell type high-temperature-resistant chemical flocculation plugging agent is aged for 20 days, which indicates that the core-shell type high-temperature-resistant chemical flocculation plugging agent has better temperature resistance.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention. In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention. Technical features of the present invention which are not described may be implemented by or using the prior art, and will not be described herein.
Claims (10)
1. A method for high-temperature well plugging by using a core-shell type high-temperature-resistant plugging agent is characterized by sequentially comprising the steps of ⑴ leak layer judgment, determining lithology of a drilled stratum according to returned rock debris, determining the depth of a leak layer when leakage occurs, measuring the leakage loss amount of drilling fluid, determining the leakage speed by combining the leakage time, ⑵ base slurry preparation, selecting a slurry preparation tank which is 40m in length and can be filled with 20m of fresh water, adding 40kg of soda ash through a slurry mixing hopper, adding 0.8 ton of sodium bentonite for drilling fluid, fully stirring for 2 hours in the slurry preparation tank to obtain base slurry, ⑶ plugging slurry preparation, adding 20 tons of the core-shell type high-temperature-resistant plugging agent into the base slurry while stirring, continuing stirring to obtain uniform plugging slurry, ⑷ drilling bit of a drilling tool, centralizer, collar and other tools, enabling an optical drilling rod to enter a drilling tool, ⑸ inspection that the slurry preparation tank can operate normally, checking that a high-temperature-resistant plugging agent is added into a drilling tank and a slurry mixing pump, calculating the plugging slurry flow rate of a plugging slurry, and a plugging slurry filling well plugging slurry filling test, and calculating the plugging slurry filling time of a plugging slurry filling station until reaching ⑻ and a pressure bearing pressure-bearing drilling slurry is not more than 3536 MPa, and a pressure-bearing drilling slurry filling test, and entering a high-bearing slurry filling test, and calculating a plugging slurry filling test, and entering a plugging slurry filling process of a plugging slurry filling test of a plugging slurry filling well plugging slurry filling test, wherein the drilling slurry filling process is repeated.
2. The method for plugging a high-temperature well by using the core-shell type high-temperature-resistant plugging agent according to claim 1, wherein the leak speed determined in the step ⑴ is lower than 10 m/h and belongs to seepage, the leak speed determined in the step 10-30 m/h belongs to medium-sized loss, the leak speed determined in the step 30-50 m/h belongs to large-sized loss, the leak speed determined in the step 50 m/h belongs to ultra-large-sized loss, the large-sized loss is obtained by adding 3-5 wt% of glass fibers or ceramic fibers into the plugging slurry obtained in the step ⑶, the fiber length is 1-3mm, and the ultra-large-sized loss is obtained by adding 3-5 wt% of glass fibers or ceramic fibers into the plugging slurry obtained in the step ⑶, and the fiber length is 3-10 mm.
3. The method for plugging a high temperature well by using the core-shell type high temperature resistant plugging agent as claimed in claim 1, wherein the step ⑶ further comprises measuring the density of the plugging slurry, calculating the equivalent density of the leaking layer according to the measured liquid level and the measured slurry density in the well, and adding barite into the plugging slurry when the equivalent density of the leaking layer is higher than the density of the plugging slurry, so that the difference ratio between the equivalent density of the leaking layer and the density of the plugging slurry is less than 5%.
4. The method for plugging a high temperature well by using the core-shell type high temperature resistant plugging agent as claimed in claim 3, wherein in step ⑹, if the equivalent density of the leaking layer is lower than the plugging slurry density, the drilling tool is lowered to a position 5-10 m above the leaking layer, and if the equivalent density of the leaking layer is higher than the plugging slurry density, the drilling tool is lowered to a position 5-10 m below the leaking layer.
5. The method for plugging a high-temperature well by using the core-shell type high-temperature-resistant plugging agent as claimed in claim 1, wherein in the step ⑺, if the height of the plugging slurry is higher than 50m, the blowout preventer is closed, and on the premise that the maximum pressure is less than 3MPa, the plugging slurry is further squeezed into the stratum with small displacement, and the height of the plugging slurry is ensured to be higher than 30m, and after the pressure is gradually reduced to zero, the blowout preventer is opened.
6. The method for plugging a high temperature well by using the core-shell type high temperature resistant plugging agent as claimed in claim 1, wherein the chloride ion content in the fresh water of step ⑵ is less than 500 ppm.
7. The method for plugging the high-temperature well by using the core-shell type high-temperature-resistant plugging agent according to claim 1, wherein the core-shell type high-temperature-resistant plugging agent in the step ⑶ is of a core-shell structure, the inner core is of high-temperature-resistant inorganic particles, the shell layer is of a reactive high-molecular prepolymer resin, the weight components of the inner core are 100 parts of high-temperature-resistant inorganic particles and 1-3 parts of a surfactant, the weight components of the shell layer are 100 parts of an epoxy resin prepolymer, 3-8 parts of an auxiliary crosslinking agent and 1-3 parts of a latent curing agent, and the weight ratio of the inner core to the shell layer is 100 (3-15).
8. The method for plugging a high-temperature well by using the core-shell type high-temperature resistant plugging agent as claimed in claim 7, wherein the high-temperature resistant inorganic particles are one or a mixture of more of calcium carbonate, quartz sand, glass powder and ceramic powder, the particle size of the particles is 800 meshes, the surface of the high-temperature resistant inorganic particles is treated by a surfactant, and the surfactant is one or more of a silane coupling agent, stearic acid, stearate or ethylene bis-stearamide.
9. The method for plugging a high-temperature well by using the core-shell type high-temperature resistant plugging agent according to claim 8, wherein the epoxy resin prepolymer is an oligomer of bisphenol A and epichlorohydrin, and the polymerization degree is 2-10; the auxiliary crosslinking agent is selected from toluene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate or hexamethylene diisocyanate; the latent curing agent is one of dicyandiamide, succinic acid hydrazide, isophthaloyl hydrazine or heptadecyl imidazole.
10. The method for plugging a high-temperature well by using the core-shell type high-temperature-resistant plugging agent according to claim 9 is characterized in that the preparation method of the core-shell type high-temperature-resistant plugging agent comprises the following steps of ① preparing raw materials according to the components of claim 7, ② adding high-temperature-resistant inorganic particles into a high-speed stirrer, starting stirring and heating to 50-80 ℃, ③ adding a surfactant into the high-speed stirrer, continuing stirring at high speed for 10-20 minutes to obtain surface-activated high-temperature-resistant inorganic particles, ④ sequentially adding a cross-linking assistant, a latent curing agent and an epoxy resin prepolymer into the high-speed stirrer, and continuing stirring at high speed for 10-20 minutes after the addition is finished.
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