CN113372889B - High water loss plugging agent - Google Patents
High water loss plugging agent Download PDFInfo
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- CN113372889B CN113372889B CN202110695941.1A CN202110695941A CN113372889B CN 113372889 B CN113372889 B CN 113372889B CN 202110695941 A CN202110695941 A CN 202110695941A CN 113372889 B CN113372889 B CN 113372889B
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- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 claims 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- 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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- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The application provides a high-water-loss plugging agent, which comprises a curing material prepared from cement, water glass and a retarder in a ratio; a high water loss material prepared from ceramsite and fly ash; modified carbon fibers having a hydrophilic group on the surface; a gas-generating material of microcapsule structure, and a fiber material. According to the application, the gas generating material is used for forming the air hole structure in the curing material, and the modified carbon fiber with shorter length and higher strength and the fiber material with longer length are matched to form a net-like structure in a staggered manner, so that the leaking stoppage block has better plasticity, coagulation strength and certain elastic deformation capability. Meanwhile, due to the action of the hydrophilic groups on the surface of the modified carbon fibers and the liquid phase of the mixed system, when the liquid phase leaks from the end of the lost circulation fracture, part of the modified carbon fibers are intercepted on the surface of the fracture. Through the action among the modified carbon fiber, the fiber material, the curing material and the high water loss material, the high water loss plugging agent provided by the application also has better capability of being attached to a crack stratum.
Description
Technical Field
The application relates to the technical field of petroleum drilling, in particular to a high-water-loss plugging agent.
Background
In various downhole operation processes such as well drilling, well cementing and completion, testing or well repair and the like, various working fluids flow into a stratum under the action of differential pressure to form lost circulation. The occurrence of lost circulation causes inconvenience of a series of drilling projects such as drilling sticking, blowout, collapse and the like, and simultaneously causes the prolongation of the drilling period and the damage of a production zone, thereby causing great economic loss. The cause of the well leakage is very complex, which is always a major engineering technical problem which puzzles oil exploration and development at home and abroad, and the economic loss related to the well leakage reaches hundreds of millions of dollars every year.
The existing well leakage treatment methods include static leakage stoppage, particle bridge plug leakage stoppage, high-water-loss slurry leakage stoppage, temporary leakage stoppage, inorganic gelled substance leakage stoppage, composite leakage stoppage technology, forced drilling casing pipe packing technology and the like, and aiming at the characteristics of a leakage layer and the reasons causing well leakage, the corresponding treatment method is adopted, so that a better leakage stoppage effect can be obtained. The high water loss slurry plugging is widely applied due to the advantages of easy operation, short construction period and the like.
The core of the high water loss slurry plugging technology lies in the performance of the high water loss plugging agent. The high water loss plugging agent is powder compounded with fibrous material, coagulant, etc. and mixed with water to form suspended plugging liquid with flowability, suspension and pumpability and excellent percolating performance. The existing high-water-loss plugging agent mainly depends on the rapid water loss compaction of a high-water-loss material in a well leakage crack to form a plugging block, and plugging is realized by filling the crack. The interaction of the plugging block with the lost circulation fracture surface is mainly expressed as extrusion. When the stratum has a structural change due to self structure or subsequent drilling vibration, the blocking block is easy to fall off, and well leakage is caused again.
Disclosure of Invention
The application aims to provide a high-water-loss plugging agent for solving the technical problem that the existing high-water-loss plugging agent is easy to separate from a lost circulation fracture and lose efficacy, so that secondary lost circulation is caused.
The high-water-loss plugging agent comprises the following components: the curing material is prepared from cement, water glass and a retarder according to the mass part ratio of 50: (8 to 10): (2~5); the high water loss material is prepared from ceramsite with the particle size not larger than 1mm and fly ash in a mass part ratio of (1~3): 10 is prepared; modified carbon fibers having hydrophilic groups and a length of not more than 0.3mm; the fiber material is 2mm to 15mm in length; the gas generating material has a microcapsule structure, the capsule wall is broken along with the rise of temperature, and the capsule core generates gas when meeting water; wherein, the volume portion ratio of the curing material, the high water loss material, the modified carbon fiber, the fiber material and the gas generating material is 5: (1~2): (2~3): 3: (1~3).
The high-water-loss plugging agent is a powdery material, and can be added into drilling fluid at a certain concentration or mixed into plugging fluid by stirring clear water during use.
In the present application, the setting material is composed of cement, water glass and a retarder. The water glass can promote the cement slurry to set. The retarder can adopt sodium dihydrogen phosphate and is used for controlling the initial setting time of the cement slurry. According to the specific condition of the lost circulation, the curing material can be fully and quickly solidified after entering a lost circulation crack by adjusting the using amount ratio of the water glass, the retarder and the cement.
In the application, the high water loss material consists of ceramsite and fly ash. The ceramsite is spherical or nearly spherical, has a more stable contact surface compared with the ceramsite with an irregular shape, and is tightly propped against each other when the ceramsite is in a mutual contact relationship in the water loss process, so that a more stable compaction structure can be formed; meanwhile, the arc-shaped surface has less interception and better guidance to the fly ash, so that the fly ash is easy to fill gaps of the ceramsite, and the stability of a compacted structure is further improved.
In the application, the surface of the modified carbon fiber has hydrophilic groups, so that the modified carbon fiber can be better dispersed in a mixed liquid system and has the tendency of dispersing more in a liquid phase (water) of the mixed system, and therefore, a gathering structure can be formed at the end of a lost circulation fracture when pressurized water loss is used for plugging. Meanwhile, the modified carbon fiber has high strength and high modulus, and the modified carbon fiber adopted by the application has shorter length, so that the aggregation structure has better mechanical property, and can efficiently and stably intercept and support the fiber materials in the system, thereby aggregating the fiber materials to form a dense network structure. The network structure is beneficial to better retaining the curing material slurry in the system so as to reduce the loss of the curing material slurry from the crack terminal.
The modified carbon fiber is easy to form a gathering structure at the end of the lost circulation fracture, is also distributed in solid-phase systems such as a solidified material and a high water loss material, is matched with a fiber material in the systems, and forms a net-like structure in the interior of a shaped structure such as a compacted high water loss material and a solidified material, so that the mechanical property of the shaped structure is improved.
In the application, the gas generating material mainly acts on the curing material, and the capsule core of the gas generating material generates gas when meeting water. The wall of the gas generating material bag is broken under the action of the temperature in the well, so that the bag core is exposed. The capsule core reacts with the liquid phase (water) of the mixed liquid system, thereby releasing gas in the system. When the solidified slurry enters the lost circulation fracture to be solidified, gas released by the gas generating material in the slurry inflates the interior of the slurry, and the volume of the slurry slightly expands, so that the adhesion of the solidified slurry and the surface of the fracture is improved. The solidified slurry is internally provided with an air hole structure which is matched with the modified carbon fiber and the fiber material, so that the elasticity of the solidified structure of the solidified material can be increased, the subsequent drilling pressure and vibration fluctuation can be better adapted, and the dropping or failure of the plugging block can be avoided.
Compared with the existing scheme, the high water loss plugging agent provided by the application adopts the gas generating material to enable the inside of the curing material to form a pore structure, and is matched with a similar net structure formed by the modified carbon fibers with shorter length and higher strength and the fiber materials with longer length in a staggered manner, so that the plugging block mainly formed by the curing material and the high water loss material has better plasticity, coagulation strength and certain elastic deformability. Meanwhile, due to the action of the hydrophilic groups on the surface of the modified carbon fibers and the liquid phase of the mixed system, when the liquid phase leaks from the end of the lost circulation fracture, part of the modified carbon fibers are intercepted on the surface of the fracture. Through the action among the modified carbon fiber, the fiber material, the curing material and the high water loss material, the high water loss plugging agent provided by the application also has better capability of being attached to a crack stratum.
In one embodiment disclosed herein, the modified carbon fiber surface has hydrophilic groups including, but not limited to, hydroxyl groups, carboxyl groups.
The preparation method of the modified carbon fiber comprises the following steps:
A1. after the surface of the carbon fiber is cleaned, the carbon fiber is placed in a container filled with water for dispersion;
A2. performing plasma surface modification treatment on the carbon fiber contained in the container in the step A1, wherein the treatment voltage is 7kV to 9kV, and the argon flow is 1.8L/min to 2.3L/min;
A3. and (3) taking out and drying the carbon fiber subjected to the step A2 treatment.
The modification treatment of the carbon fiber surface is the prior art, and the treatment method can be summarized into three steps of surface cleaning and impurity removal, surface flatness reduction by etching, functional group introduction and the like. Wherein, in the functional group introduction treatment, various methods such as a gas phase oxidation method, a liquid phase oxidation method, grafting, surface coating and the like can be selected according to requirements.
In one embodiment disclosed in the application, the fiber material is any one or more of basalt fiber, polyester fiber, polypropylene fiber and polyacrylonitrile fiber.
In this application, fibrous material's main effect forms more intensive network structure with the cooperation of modified carbon fiber, is used for holding back solidification thick liquids on the one hand, reduces its velocity of flow in the lost circulation crack, in order to reduce the loss of solidified material, and on the other hand, remains in solidified material solidification structure and high loss of water material compact structure, with the high modulus of carbon fiber, high strength and fibrous material's pliability, improves the mechanical properties of leaking stoppage piece, makes leaking stoppage piece have higher coagulation strength and certain elastic deformation ability.
In one embodiment disclosed by the application, the capsule core of the gas generating material is the capsule wall of the sodium bicarbonate gas generating material, and the grease with the freezing point not lower than 10 ℃ and the melting point not higher than 60 ℃ is adopted.
In one embodiment disclosed herein, a method for preparing a gas generating material comprises the steps of:
B1. according to the mass part ratio of (10 to 15): 1 preparing a mixed wall material consisting of paraffin (the grade is lower than 60) and modified starch, and putting the mixed wall material into ethanol at 55-65 ℃ for dissolving and dispersing;
B2. adding 60-100-mesh sodium bicarbonate powder into the solution system obtained in the step B1, and stirring to obtain suspension;
B3. and D, granulating the suspension obtained in the step B2 by using a centrifugal spray dryer.
Wherein the mass part ratio of the mixed wall material in the step B1 to the sodium bicarbonate powder in the step B2 is (3~5): 1.
wherein the grain diameter of the granulation obtained in the screening step B3 is 0.1mm to 0.3mm.
In the application, the time for the gas-generating material to release gas needs to be controlled, so that the microcapsule structure is adopted, the capsule core which generates gas when meeting water is wrapped by the capsule wall, and the wall breaking of the capsule wall is realized by the temperature in the well. In order to ensure the full exposure of the capsule core, the proportion of the wall material and the core material is regulated and controlled, so that the microcapsule structure has a capsule wall with a proper thickness (0.01mm to 0.05mm).
Drawings
In order to more clearly illustrate the technical solutions in the present application or the prior art, the drawings required in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a graph showing the results of measuring the fluidity of a leakage stopper 1 and a leakage stopper 2 in example 4.
FIG. 2 is an image of the measurement result of the depth of the bottom of the filter cake intruding into the sand bed obtained by treating the plugging fluid 1 and the plugging fluid 2 with the FA zero-penetration filtration apparatus in example 4.
Figure 3 is an image of the filter cake obtained in example 4 by treatment of the plugging fluid 1 with a HTHP fluid loss filter.
Figure 4 is an axial cross-sectional image of the filter cake obtained in example 4 using an HTHP fluid loss filter to treat fluid 1.
FIG. 5 is an image of a filter cake obtained by treating 20% plugging agent plugging fluid in example 4 with an API fluid loss filter, an FA zero-permeability fluid loss filter, and an HTHP fluid loss filter.
FIG. 6 is a graph showing the relationship between the thickness of a filter cake and the pressure obtained by treating a plugging fluid containing 15% of plugging agent with an API fluid loss filter in example 4.
FIG. 7 is a sample image of the formation at the leak-off in example 5.
Fig. 8 is an image of a sampled formation after plugging is completed in example 5.
Detailed Description
In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the embodiments of the present application. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.
Embodiments of the present application will be described in detail below with reference to the accompanying drawings.
Example 1
The high water loss plugging agent provided by the embodiment is prepared by mixing a curing material, a high water loss material, modified carbon fibers, a fiber material and a gas generating material according to the volume part ratio of 5.
Wherein,
the curing material is prepared by mixing cement, water glass and sodium dihydrogen phosphate according to the mass part ratio of 50;
the high water loss material is prepared from ceramsite with the particle size of 0.05mm and fly ash according to the mass part ratio of 1;
the modified carbon fiber is prepared by normal pressure argon plasma treatment, the number of hydroxyl and carbonyl on the surface of the prepared modified carbon fiber is increased, and the length of the modified carbon fiber is 0.3mm;
the fiber material is a mixture of polyester fibers, polypropylene fibers and polyacrylonitrile fibers with the length of 2mm-15mm;
the gas production material is prepared by the following steps: according to the mass part ratio of 10:1 preparing a mixed wall material consisting of 52# paraffin and modified starch, and putting the mixed wall material into ethanol at 55 ℃ for dissolving and dispersing; adding 60-100 mesh sodium bicarbonate powder into a wall material ethanol mixing system, and stirring to obtain a suspension; and granulating the suspension by using a centrifugal spray dryer, and screening powder with the particle size of 0.1mm to 0.3mm.
Example 2
The high-water-loss plugging agent provided by the embodiment is prepared by mixing a curing material, a high-water-loss material, modified carbon fibers, a fiber material and a gas-generating material according to the following proportion of (by volume ratio) 5.
Wherein,
the curing material is prepared by mixing cement, water glass and sodium dihydrogen phosphate according to the mass part ratio of 10;
the high water loss material is prepared from ceramsite with the particle size of 0.05mm and fly ash according to the mass part ratio of 3;
the modified carbon fiber is prepared by normal pressure argon plasma treatment, the number of hydroxyl and carbonyl on the surface of the prepared modified carbon fiber is increased, and the length is 0.1mm to 0.2mm;
the fiber material adopts basalt fibers with the length of 2mm-15mm;
the gas generating material is prepared by the following steps: according to the mass part ratio of 15:1 preparing a mixed wall material consisting of 52# paraffin and modified starch, and putting the mixed wall material into ethanol at 55 ℃ for dissolving and dispersing; adding 60-100-mesh sodium bicarbonate powder into a wall material ethanol mixing system, and stirring to prepare a suspension; and granulating the suspension by using a centrifugal spray dryer, and screening powder with the particle size of 0.1mm to 0.3mm.
Example 3
The high water loss plugging agent provided by the embodiment is prepared by mixing a curing material, a high water loss material, modified carbon fibers, a fiber material and a gas generating material according to the volume part ratio of 5.
Wherein,
the curing material is prepared by mixing cement, water glass and sodium dihydrogen phosphate according to the mass part ratio of 25;
the high water loss material is prepared by mixing ceramsite with the particle size of 1mm and fly ash according to the mass part ratio of 1:5;
the modified carbon fiber is prepared by normal pressure argon plasma treatment, the number of hydroxyl and carbonyl on the surface of the prepared modified carbon fiber is increased, and the length is 0.2mm;
the fiber material adopts polypropylene fiber with the length of 2mm-15mm;
the gas production material is prepared by the following steps: according to the mass portion ratio of 12:1 preparing a mixed wall material consisting of 54# paraffin and modified starch, and putting the mixed wall material into ethanol at 60 ℃ for dissolving and dispersing; adding 60-100-mesh sodium bicarbonate powder into a wall material ethanol mixing system, and stirring to prepare a suspension; and granulating the suspension by using a centrifugal spray dryer, and screening powder with the particle size of 0.1mm to 0.3mm.
Example 4
In this example, the high water loss plugging agent obtained in example 1 was used to prepare a plugging fluid, and a plurality of experiments were performed to demonstrate the plugging effect.
Leakage blocking liquid 1: calcium chloride, the high-water-loss plugging agent obtained in the example 1 and clear water are prepared according to the mass volume ratio of 1;
and (3) leakage blocking liquid 2: the high-water-loss plugging agent is prepared by mixing walnut shells, calcium chloride, the high-water-loss plugging agent obtained in the example 1 and clear water according to the following mass part ratio of 10.
As shown in FIG. 1, the two kinds of leakage stoppers were placed on a horizontal glass plate, and their fluidity was measured by a fluidity meter. The fluid diameter of the leakage stoppage fluid 1 is 25.5cm, and the fluid diameter of the leakage stoppage fluid 2 is 23cm. Therefore, the influence of the walnut shells on the fluidity is small, and the bridging agents such as the walnut shells and the like can be added according to the size of the lost circulation cracks and the existing plugging and bridging principle when the actual plugging is carried out.
And (3) measuring the filtration time and the blocking thickness of the plugging liquid 1 by adopting an API (application programming interface) filtration loss instrument, wherein the total filtration loss time is 27s to 33s, the thickness of the filter cake is 15mm, the thickness of the filter cake is 17mm after the displacement mud is added, and the leakage amount is 4mL.
And (3) adopting an FA non-permeability filtration apparatus to perform experiments on the two plugging liquids so as to observe the depth of the plugging liquid invading the sand bed. 550mL (about 1/2 of the total volume) of 5-10 mesh quartz sand is measured and poured into an FA non-permeability filtration apparatus and shaken uniformly. 400mL (about 1/3 of the total volume) of the two plugging liquids were slowly introduced, and the total fluid loss at 0.7MPa was measured. As a result, as shown in FIG. 2, the plugging was caused by the total fluid loss of both plugging liquids under pressure, and the depth of intrusion of the plugging liquid 1 into the sand bed was 10mm and the depth of intrusion of the plugging liquid 2 into the sand bed was 8mm.
Plugging experiments were performed on the plugging fluid 1 using an HTHP fluid loss filter (GGS 71 type). 150mL of 5-10 mesh quartz sand is measured for experiment, poured into a GGS71 type filtration loss apparatus (without filter paper) and shaken uniformly. About 1400mL of the plugging solution was slowly introduced. Slowly pressurize and filter to form a plug at 1.0 MPa. Then, 400mL of well slurry is adopted by using a meta dam 701, and the stirring is carried out for 5min. And (3) pouring 130mL of well slurry onto the filter cake, sequentially increasing the pressure from 1MPa to 5MPa, increasing the pressure by 1MPa each time, and stabilizing for 3min. The obtained filter cake is shown in figures 3 and 4, the filter cake has more gaps inside, and is seen to be formed by net-shaped clusters, and the net-shaped clusters at the bottom of the filter cake, which is contacted with the sand reservoir, are distributed more densely; the surface of the filter cake can see capillary permeable structure.
The concentration of the plugging fluid 1 is reduced to 20%, the plugging effect and the compressive strength are measured again by using an API (application programming interface) filtration loss instrument, an FA (FA) non-permeable filtration loss instrument and an HTHP filtration loss instrument, and the obtained filter cake is shown in figure 5. The result shows that the concentration of the plugging agent is reduced to 20%, the plugging can still be realized, and the compression resistance can reach more than 5 MPa.
The concentration of the plugging liquid 1 is reduced to 15 percent, and the pressure drop condition is measured under the pressure of 2MPa, 3MPa, 4MPa and 5MPa respectively on seam plates with the width of 1mm and 2mm by adopting a DL type plugging material experimental device. The results of the experiments are shown in the following table:
according to the table, the compressive strength of the leakage-stopping liquid in a seam plate with the thickness of 1mm can reach 5MPa; the 2mm seam plate can resist at least 3MPa.
And (3) treating the leakage-stopping solution with the concentration of 15% by adopting an API (American Petroleum institute) filtration loss instrument to obtain a filter cake. And (3) placing the filter cake in a pressure machine, stabilizing the pressure for 1min under different pressures, and taking down the filter cake. And (3) observing the deformation condition of the filter cake, measuring the thickness of the filter cake by using a vernier caliper, and drawing a curve graph (shown in figure 6) of the relation between the pressure and the thickness of the filter cake, wherein the filter cake is not damaged and is not obviously deformed under the pressure of 20MPa, so that the compressive strength of the filter cake is better. As can be seen from the graph shown in FIG. 6, the formed filter cake has better compressibility and high compressive strength.
Example 5
The embodiment occurs in a structure that the library cars are sunken and fall off and are worship about in a city and are in a great uniform shape, and the library car groups (a first library section, a second library section, a third library section and a fourth library section) are newly tied. The large-line structure mainly takes fault propagation folds under the extrusion background, and stratum cracks develop; the lithology is mainly gravel, is in a non-cemented and weakly cemented state, is loose, and has high permeability (as shown in figure 7). Following field development, N 2 k 1 ～N 2 k 3 The pressure of an oil layer has serious deficit, the compaction effect of the stratum is weak, the rock is loose, the porosity is high, and the superficial stratum tensile fracture is developed very well, so that N is caused 2 k 1 ～N 2 k 2 Crack development; n is a radical of 2 k 1 ～N 2 k 4 In particular N 2 k 1 ～N 2 k 3 Lost circulation often occurs during drilling. The well leakage in the well drilling is usually lost return leakage, but can be blocked only by adopting the plugging while drilling or the bridging slurry plugging, and is easy to treat. When the well is completed or the pump circulation is started after the casing is put, the loss of return leakage occurs again, so that the annulus of the cement paste returns low, and the requirement of sealing the production casing cannot be met. If the well cementation adopts 'forward injection and backward extrusion' cement slurry and the remedial measure of carrying out perforation on the empty casing section and extruding the cement slurry to the annulus after the well cementation is adopted, the time and economic losses are great, and meanwhile, the well completion quality is influenced.
In the embodiment, the DWQ1-1-10 well is a shallow oil-gas well, the well type is a straight well, the well depth is 800-1100 m, and the well completion mode is casing perforation, a rotary pumping oil production well body structure and a drilling tool structure. Because the well drilling/completion period is short, the engineering cost is low, the plugging method and the process are simple, convenient and feasible, the operation time is short, and the cost is lower. Because the diagenesis of the stratum at the upper part of the first section of the reservoir to the second section of the reservoir is extremely poor, the well wall of the near-wellbore zone is damaged, and therefore the plugging needs to have a certain consolidation effect on the unconsolidated stratum. In the embodiment, the high water loss and coagulable plugging treatment is carried out by using the high water loss plugging agent obtained in the embodiment 2.
And when the DWQ1-1-10 well II is drilled to 216m, the well leakage and the lost return occur. The density of the drilling fluid is 1.19 during the well leakage, and the discharge capacity is 24L/s. And (3) adopting bridge slurry to successfully stop the leakage, continuously drilling the well, and slightly leaking in the well until the drilling depth is finished, wherein the leakage phenomenon basically disappears. In order to improve the pressure-bearing capacity of a well and prevent well cementation and leakage, the plugging agent prepared in the embodiment 2 is adopted to implement full-well high-water-loss pressure-bearing plugging before casing running after well logging. After plugging treatment, the stratum is sampled as shown in fig. 8, and the sampled surface layer is seen to be compact and smooth.
The high-water-loss pressure-bearing leak stopping agent is prepared by mixing calcium chloride, the high-water-loss leak stopping agent obtained in the example 2, walnut shells and clean water according to the mass volume ratio of 0.5.
The specific implementation steps are as follows:
(1) Before casing, a smooth drill rod is lowered to the bottom of the well, and a small-displacement pump is started for circulation;
(2) Pumped into the well at 12.7m 3 Replacing the slurry in place according to the leakage-stopping liquid obtained by the proportion;
(3) Lifting all drilling tools, namely Guan Quanfeng flashboards; stopping leakage by intermittent squeezing, with the highest pressure of 1MPa and the stable pressure of 0.8MPa;
(4) And (3) setting a 127mm sleeve, injecting cement slurry for well cementation, wherein the density of the cement slurry is 1.43g/cm & lt 3 & gt, and cement returns to the ground without obvious loss.
After well cementation, the calculated amount of slurry return accounts that the cement slurry of well cementation only returns by 3.4 sides less, and the oil layer casing is well consolidated. The well completion quality was rated as good.
Claims (7)
1. The high-water-loss plugging agent is characterized by comprising the following components:
the curing material is prepared from cement, water glass and a retarder according to the mass part ratio of 50: (8 to 10): (2~5);
the high-water-loss material is prepared from ceramsite with the particle size not larger than 1mm and fly ash in a mass part ratio of (1~3): 10 is prepared;
modified carbon fibers having hydrophilic groups and a length of not more than 0.3mm;
the fiber material is 2mm to 15mm in length;
the gas generating material has a microcapsule structure, the capsule wall is broken along with the rise of temperature, and the capsule core generates gas when meeting water;
wherein,
the surface of the modified carbon fiber has hydrophilic groups including hydroxyl and carboxyl;
the capsule core of the gas production material is sodium bicarbonate, and the capsule wall is made of grease with the freezing point not lower than 10 ℃ and the melting point not higher than 60 ℃; the volume part ratio of the curing material, the high water loss material, the modified carbon fiber, the fiber material and the gas generating material is 5: (1~2): (2~3): 3: (1~3).
2. The high water loss plugging agent according to claim 1, wherein the preparation method of the modified carbon fiber comprises the following steps:
A1. after the surface of the carbon fiber is cleaned, placing the carbon fiber in a container filled with water for dispersion;
A2. performing plasma surface modification treatment on the carbon fiber contained in the container in the step A1, wherein the treatment voltage is 7kV to 9kV, and the argon flow is 1.8L/min to 2.3L/min;
A3. and (3) taking out and drying the carbon fiber subjected to the step A2 treatment.
3. The high water loss plugging agent according to claim 1, wherein the fiber material is any one or more of basalt fiber, polyester fiber, polypropylene fiber and polyacrylonitrile fiber.
4. The high water loss plugging agent according to claim 1, wherein the preparation method of the gas-generating material comprises the following steps:
B1. according to the mass part ratio of (10 to 15): 1, preparing a mixed wall material consisting of paraffin and modified starch, and putting the mixed wall material into ethanol at the temperature of 55-65 ℃ for dissolving and dispersing;
B2. adding 60-100-mesh sodium bicarbonate powder into the solution system obtained in the step B1, and stirring to obtain suspension;
B3. and D, granulating the suspension obtained in the step B2 by using a centrifugal spray dryer.
5. The high water loss plugging agent according to claim 4, wherein the mass part ratio of the mixed wall material in step B1 to the sodium bicarbonate powder in step B2 is (3~5): 1.
6. the high-water-loss plugging agent according to claim 4, wherein the particle size of the granules obtained in the screening step B3 is 0.1mm to 0.3mm.
7. A method for using a high water loss plugging agent is characterized in that drilling fluid or clean water is mixed with the high water loss plugging agent of any one of claims 1~6 to prepare suspension;
or
Mixing clear water with the high water loss plugging agent of any one of claims 1~6, and adding walnut shells to prepare a suspension.
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| CN114890714B (en) * | 2022-05-10 | 2023-05-05 | 安徽陆海石油助剂科技有限公司 | High-water-loss plugging agent and preparation method thereof |
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