CN110872494A - High-strength pressure-bearing plugging agent for well drilling and application thereof - Google Patents
High-strength pressure-bearing plugging agent for well drilling and application thereof Download PDFInfo
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- 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
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
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- 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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/08—Fiber-containing well treatment fluids
Abstract
The invention provides a high-strength pressure-bearing plugging agent for well drilling and application thereof, wherein the plugging agent comprises the following components: 20-30 parts of PPS plastic granular material; 15-30 parts of graphite particle materials; 35-45 parts of a filler particulate material; 3-10 parts of a fiber material; the sum of the mass parts of all the components is 100; the graphite particle material is selected from one or more of natural graphite particles and expanded graphite particles, and the size of the graphite particle material is 40-80 meshes of a standard sample separation sieve; the main component of the filling particle material is calcium carbonate or silicate. The main material of the pressure-bearing plugging agent has high strength, is not easy to break under the complex stress state of the well bottom, and can form a stable and firm plugging layer by matching with graphite granular materials, filling granular materials and fiber materials. In addition, the pressure-bearing plugging agent has strong temperature resistance, cannot lose efficacy due to material deterioration caused by high temperature, and can meet the requirement of improving the stratum pressure-bearing capacity in deep well drilling.
Description
Technical Field
The invention belongs to the technical field of petroleum drilling engineering plugging, and particularly relates to a high-strength pressure-bearing plugging agent for drilling and application thereof.
Background
With the high-speed development of the economic society, the energy demand is continuously increased, the recovery ratio is continuously improved along with the continuous development of oil and gas resources in shallow strata, the content of residual oil is gradually reduced, and the exploration of new oil and gas resources is shifted to the development of deeper strata. In recent years, large oil and gas fields found in China and oil and gas fields in middle and sub-regions cooperating with foreign countries are deep-seated. In the oil and gas exploration and development, the drilling of the stratum is more and more complex, the collapse and leakage caused by the expansion and collapse necking of the shale stratum exist together, and the blowout and leakage problems caused by multiple sets of pressure layer systems exist in the same open hole section, so that the safety density window of the drilling fluid is narrow in the drilling process. The drilling fluid density is reduced to easily cause well collapse or overflow, the drilling fluid density is increased to cause leakage, the adjustable range of the drilling fluid density is extremely small, and the drilling safety construction is greatly influenced.
The method is an important means for expanding the upper limit of a drilling fluid safety density window and ensuring safe drilling under the condition of a narrower safety density window in the current oil and gas drilling engineering. The pressure-bearing plugging agent is added into the drilling fluid to plug cracks, micro cracks and pores in a weak stratum, and the improvement of the stratum breakage and leakage prevention capability is a main way for improving the stratum pressure-bearing capability. The pressure-bearing plugging agent enters the cracks to form a plugging partition wall and support the crack surface, and additional circumferential stress is generated around the well, so that the pressure of stratum secondary fracture is improved, and the aim of improving the pressure-bearing capacity of the stratum is fulfilled.
At present, the main components of the plugging agent for improving the pressure bearing capacity of the stratum are mineral and shell granular materials, such as calcium carbonate, marble particles, quartz sand, walnut shells and the like. However, mineral granular materials are generally brittle and are very easy to break under the action of pressure, and the breaking of the granular materials can directly cause the formed pressure-bearing plugging layer to be damaged and fail. In SPE Drilling & completing 2014,29(03): 323-328 'On the Shear depletion of Lost-circulation materials', it is reported that mineral particle materials are easy to be crushed in the process of pressure-bearing leak stoppage, and particularly, in the process of pumping the leak stoppage slurry into a well, the size of the mineral particle materials is changed due to collision friction among particles and between the particles and a Drilling tool, so that the effect of pressure-bearing leak stoppage construction is influenced.
The other kind of pressure-bearing leak-stopping shell is hard and not easy to break in natural state. However, under the action of the drilling fluid soaking and the high temperature of the stratum, the shell materials are easy to soften and carbonize, so that the formed plugging layer is damaged, and the pressure-bearing plugging effect is also influenced. Therefore, the research on the high-performance pressure-bearing plugging agent has important significance for effectively improving the pressure-bearing capacity of the stratum and ensuring the safe drilling of the stratum with a narrow safe density window.
Disclosure of Invention
In view of the above, the application provides a high-strength pressure-bearing plugging agent for well drilling and an application thereof.
The invention provides a high-strength pressure-bearing plugging agent for well drilling, which comprises the following components in parts by mass:
20-30 parts of PPS plastic granular material;
15-30 parts of graphite particle materials;
35-45 parts of a filler particulate material;
3-10 parts of a fiber material;
the sum of the mass parts of all the components is 100;
the graphite particle material is selected from one or more of natural graphite particles and expanded graphite particles, and the size of the graphite particle material is 40-80 meshes of a standard sample sieve; the main component of the filling particle material is calcium carbonate or silicate.
Preferably, the PPS plastic-based particle material is selected from one or more of PPS plastic particles and reinforced PPS composite particles.
Preferably, the PPS plastic-based particle material comprises: a first granular material with a standard sample separating sieve of 14-20 meshes and a second granular material with a standard sample separating sieve of 40-80 meshes; the mass ratio of the first particle material to the second particle material is (4-2): 2.
preferably, the filler particulate material is selected from one or more of calcium carbonate powder, limestone powder, shell powder and quartz sand.
Preferably, the size of the filling particle material is 120-325 meshes of a standard sample separation sieve.
Preferably, the fibrous material is selected from one or more of sepiolite fibres and polymer fibres.
Preferably, the length of the fiber material is 2-5 mm, and the fiber diameter is 0.01-0.1 mm.
The invention provides application of the high-strength pressure-bearing plugging agent for drilling as described above in drilling fluid plugging.
Compared with the prior art, the plugging agent provided by the invention mainly comprises PPS plastic granular materials, graphite granular materials, filling granular materials and fiber materials in a certain proportion, wherein the graphite granular materials are selected from one or more of natural graphite particles and expanded graphite particles, and the size of the graphite granular materials is 40-80 meshes of a standard sample separation sieve; the main component of the filling particle material is calcium carbonate or silicate. In the invention, the PPS plastic granular material has high strength, good impact resistance and high long-term application temperature, so that the granules can withstand complex stress change and high-temperature action at the bottom of a well and are not easy to break and change in properties, which is very important for forming a stable high-bearing-strength plugging layer in a leaking layer by using the plugging agent. The graphite granular material is high-temperature resistant, has good toughness and certain elasticity, is not easy to break under the extrusion and impact effects, plays a pressure buffering role in the plugging layer, and avoids the granules in the plugging layer from being directly impacted and broken in the underground pressure fluctuation process. The filling and lacing effects of the filling particle materials and the fiber materials promote a plugging layer formed by the pressure-bearing plugging agent to be more complete, and the capability of the plugging layer for resisting bottom-hole pressure fluctuation is improved. The main material of the pressure-bearing plugging agent has high strength, is not easy to break under the complex stress state of the well bottom, and can form a stable and firm plugging layer by matching with graphite granular materials, filling granular materials and fiber materials.
In addition, the pressure-bearing plugging agent has strong temperature resistance, cannot lose efficacy due to material deterioration caused by high temperature, and can meet the requirement of improving the stratum pressure-bearing capacity in deep well drilling.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a high-strength pressure-bearing plugging agent for well drilling, which comprises the following components in parts by mass:
20-30 parts of PPS plastic granular material;
15-30 parts of graphite particle materials;
35-45 parts of a filler particulate material;
3-10 parts of a fiber material;
the sum of the mass parts of all the components is 100;
the graphite particle material is selected from one or more of natural graphite particles and expanded graphite particles, and the size of the graphite particle material is 40-80 meshes of a standard sample sieve; the main component of the filling particle material is calcium carbonate or silicate.
In order to solve the problems that the bearing leakage stopping material has insufficient strength and is easy to deteriorate to cause bearing leakage stopping effect and cannot meet the requirements of oil and gas exploration and development of deep strata, the invention provides a high-strength bearing leakage stopping agent which can form a stable sealing layer in a leakage layer so as to effectively improve the bearing capacity of the strata.
The plugging agent provided by the invention comprises 20-30 parts of PPS plastic granular material by taking the total mass part of the plugging agent as 100 parts, belongs to a main material of the plugging agent, has high strength and good toughness, is not easy to break under the action of pressure, and does not change the performance due to the temperature of a stratum.
The PPS plastic granular material can be selected from one or more of PPS plastic granules and reinforced PPS composite granules; the PPS plastic particle material is formed by mixing one or more of pulverized PPS plastic and reinforced PPS composite materials. PPS plastic (polyphenylene sulfide) is thermoplastic special engineering plastic with excellent comprehensive performance, and has the outstanding characteristics of high temperature resistance, corrosion resistance and excellent mechanical performance; in the embodiment of the invention, the density is 1.3-1.8 g/cm3The temperature resistance is strong, and the long-term use temperature exceeds 260 ℃. The reinforced PPS composite material comprises but is not limited to a glass fiber reinforced PPS composite material, a carbon fiber reinforced PPS composite material, an inorganic filling reinforced PPS composite material and the like.
In the embodiment of the invention, the compressive strength of the raw materials of the PPS plastic high-strength particles can reach hundreds of megapascals, the impact resistance is good, and the long-term application temperature exceeds 200 ℃, so that the high-strength particles can bear complex stress change and high-temperature action at the bottom of a well and are not easy to break and change in properties, which is very important for forming a stable high-bearing-strength plugging layer in a leaking layer by using the plugging agent. Pressing a certain amount of the above-mentioned granular materials in the chamber with different pressures to obtain the proportion of the granules broken, the results include: the conventional mineral particles have the breakage rate of 30% under the pressure of 5MPa, the breakage rate of the high-strength particles is lower than 1%, the breakage rate of the high-strength particles does not exceed 3% under the pressure of 20MPa, the high-strength particles are not easy to break under high pressure, and the stability and the high strength of a plugging layer formed by the plugging agent are ensured.
In a preferred embodiment of the present invention, the PPS plastic-based particle material comprises: a first granular material with a standard sample separating sieve of 14-20 meshes and a second granular material with a standard sample separating sieve of 40-80 meshes; the mass ratio of the first particle material to the second particle material is (4-2): 2, the mass ratio can be simplified to 1-2; the mass ratio of the two is more preferably 3: 2. specifically, the high-strength granular material is formed by mixing the material granules with the sizes of 14-20 meshes and 40-80 meshes of the standard sample separation sieve respectively, and the mass ratio of the material granules to the standard sample separation sieve can be 1:1, 3:2 or 2: 1.
In addition, the high-strength pressure-bearing plugging agent for drilling comprises 15-30 parts by mass of graphite granular materials. The graphite particle material is selected from one or more of natural graphite particles and expanded graphite particles, and the size of the graphite particle material is 40-80 meshes of a standard sample separation sieve. The source of the graphite type particle material is not particularly limited; wherein, the Expanded Graphite (EG for short) is a loose and porous vermicular substance obtained by intercalation, water washing, drying and high-temperature expansion of natural Graphite flakes, belongs to a carbon material, and the expansion volume of the Expanded Graphite can reach more than 200 times of the original volume.
In the invention, the graphite particle material is high temperature resistant, has good toughness and certain elasticity, and can be called as an elastic particle material; the plugging layer is not easy to break under the action of extrusion and impact, plays a role in pressure buffering in the plugging layer, and avoids the particles in the plugging layer from being broken due to direct impact in the process of underground pressure fluctuation. For example, graphite is flexible, can be rolled into thin sheets, and is not easy to break; the expanded graphite contains tiny pores and has good compression and rebound performance.
In addition to the high-strength granular material and the elastic granular material, the plugging agent provided by the invention comprises 35-45 parts by mass of filling granular material, and mainly plays a filling role. The main component of the filling particle material is calcium carbonate or silicate, and the filling particle material can be one or more of calcium carbonate powder, Qing mountain flour, shell powder and quartz sand, and the size of the filling particle material is 120-325 meshes of a standard sample sieve.
Wherein the calcium carbonate powder is mineral particles formed by crushing limestone, marble and the like. The Qingshi powder is formed by crushing bluestone; bluestone andweighing limestone, main component calcium carbonate of limestone (CaCO)3). The shell powder is obtained by processing shells, and the main components of the shells are 95 percent of calcium carbonate and a small amount of chitin. The quartz sand (powder) is quartz particles formed by crushing and processing quartz stones; quartz is a nonmetallic mineral, is a hard, wear-resistant, chemically stable silicate mineral, and has SiO as main mineral component2. The present invention may employ common quartz sand known in the art, i.e., SiO2≥90-99％，Fe2O3≤0.06-0.02％。
The particle material in the embodiment of the invention has wide size distribution range, and the size of the high-strength particle material, the size of the elastic particle material and the size of the filling particle material are not continuously distributed, so that the permeability of the staying section cannot be rapidly reduced in the staying and stacking process of the material in the leakage layer, and more materials stay to form a longer staying section.
In the invention, the plugging agent comprises 3-10 parts of fiber material. According to the invention, through the filling and lacing effects of the filling particle material and the fiber material, a plugging layer formed by the pressure-bearing plugging agent is more complete, and the capability of the plugging layer for resisting bottom-hole pressure fluctuation is improved.
The fiber material is fibrous and can be selected from one or more of sepiolite fiber and polymer fiber. Wherein the polymer fibers include, but are not limited to, polypropylene fibers, polyester fibers, polyamide fibers; the sepiolite fibers are fibers containing sepiolite minerals as a main component, and are called sepiolite mineral fibers. Sepiolite fiber is a natural mineral fiber, a fibrous variant of sepiolite mineral; sepiolite is a layer chain silicate mineral and has the characteristics of good heat resistance, good ion exchange, corrosion resistance and the like. Specifically, the length of the fiber material is preferably 2 mm-5 mm, and the fiber diameter is 0.01 mm-0.1 mm; preferably, the fineness of the fiber is 0.018-0.040 mm. Here, the length of the fiber material is an average length of fibers well known in the art; the fiber diameter range is consistent with the concept of fineness range, and is also an average range.
The sum of the mass parts of the components is 100; the pressure-bearing plugging agent is obtained by weighing different raw material components, mixing and stirring uniformly, and has the advantages of easily obtained raw materials and simple manufacturing process. The main material of the pressure-bearing plugging agent has high strength and is not easy to break under the complex stress state of the well bottom, and a stable and firm plugging layer can be formed by matching the elastic granular material, the filling granular material and the fiber material; meanwhile, the pressure-bearing plugging agent has strong temperature resistance, cannot lose efficacy due to material deterioration caused by high temperature, and can meet the requirement of improving the stratum pressure-bearing capacity in deep well drilling.
The invention relates to a high-strength pressure-bearing plugging agent for drilling fluid, which is used for improving the pressure-bearing capacity of a stratum in the process of petroleum exploration and development; the high-strength pressure-bearing plugging agent for drilling can be particularly applied to plugging of drilling fluid.
In some embodiments of the invention, 4% of bentonite and 0.3% of tackifier are prepared according to the formula to prepare the leakage stoppage base slurry for experiments, and 5% -12% of the high-strength pressure-bearing leakage stoppage agent product can be respectively added into the leakage stoppage base slurry according to the volume mass ratio and is uniformly stirred. The raw material components in the base slurry are not particularly limited in the present invention, and those commonly used in the art may be used.
According to the result of a plugging experiment, the high-strength pressure-bearing plugging agent can effectively plug a crack leaking layer, a compact plugging section with a certain length is formed in the leaking layer, and the formed plugging layer can bear the pressure of more than 8 MPa. The pressure-bearing plugging agent has the advantages of no obvious change, stable performance, compact accumulation of materials in cracks and good pressure-bearing effect.
For further understanding of the present application, the high strength pressure-bearing plugging agent for well drilling and the application thereof provided by the present application are specifically described below with reference to the examples.
In the following examples, the PPS plastic particles, glass fiber reinforced PPS plastic particles, and inorganic-filled PPS plastic particles were obtained from Ningbo Tetrage plastics Co., Ltd, and were pulverized and sieved to obtain 14-20 mesh and 40-80 mesh granular materials having compressive strengths of 140-145MPa, Rockwell hardness of 100M, specific abrasion of 0.07-0.7 x 10-3mm3N.m, density of 1.3-1.8 g/cm3. The natural graphite and the expanded graphite are purchased from a large Hua mineral processing factory in Lingshu county and have the size of 40-80 meshes of a standard sample separation sieve. The calcium carbonate powder, the Qing mountain flour, the shell powder and the quartz sand powder are all from a Gung Hui Shuo mineral processing factory in Lingshou county, and the size of the standard sample separation sieve is 120-325 meshes. The used polypropylene fiber is from Ningyang bang energy engineering materials Limited company, the fineness range is 0.01-0.020 mm, and the length is 2-5 mm; the sepiolite fiber is from a processing plant of Huashuo mining products in Lingshui county, and the length of the sepiolite fiber is 2-5 mm.
Example 1:
13.8 parts of PPS plastic particles with 14-20 meshes of a standard sample separating sieve, 9.2 parts of PPS plastic particles with 40-80 meshes of the standard sample separating sieve, 30 parts of expanded graphite particles with 40-80 meshes of the standard sample separating sieve, 45 parts of calcium carbonate powder with 120-325 meshes of the standard sample separating sieve and 3 parts of polypropylene fibers with 3mm of length are weighed and placed in a mixing device to be uniformly stirred and mixed, and the high-strength pressure-bearing plugging agent is obtained.
Example 2:
weighing 15.6 parts of PPS plastic particles with 14-20 meshes of a standard sample separating sieve, 10.4 parts of PPS plastic particles with 40-80 meshes of the standard sample separating sieve, 24 parts of expanded graphite particles with 40-80 meshes of the standard sample separating sieve, 45 parts of quartz sand powder with 120-325 meshes of the standard sample separating sieve and 3 parts of sepiolite fibers with 5mm of length, and placing the components in a mixing device to be uniformly stirred and mixed to obtain the high-strength pressure-bearing plugging agent.
Example 3:
weighing 16.8 parts of glass fiber reinforced PPS plastic particles with a standard sample separating sieve of 14-20 meshes, 11.2 parts of glass fiber reinforced PPS plastic particles with a standard sample separating sieve of 40-80 meshes, 26 parts of natural graphite particles with a standard sample separating sieve of 40-80 meshes, 45 parts of limestone powder with a standard sample separating sieve of 120-325 meshes and 6 parts of polypropylene fibers with a length of 3mm, and placing the materials into mixing equipment to be uniformly stirred and mixed to obtain the high-strength pressure-bearing plugging agent.
Example 4:
weighing 18 parts of inorganic filling PPS plastic particles with 14-20 meshes of a standard sample separating sieve, 12 parts of inorganic filling PPS plastic particles with 40-80 meshes of the standard sample separating sieve, 25 parts of expanded graphite particles with 40-80 meshes of the standard sample separating sieve, 37 parts of shell powder with 120-325 meshes of the standard sample separating sieve and 8 parts of polypropylene fibers with 2mm length, and placing the materials into mixing equipment to be uniformly stirred and mixed to obtain the high-strength pressure-bearing plugging agent.
Example 5:
16.8 parts of PPS plastic particles with a standard sample separating sieve of 14-20 meshes, 11.2 parts of PPS plastic particles with a standard sample separating sieve of 40-80 meshes, 22 parts of expanded graphite particles with a standard sample separating sieve of 40-80 meshes, 45 parts of limestone powder with a standard sample separating sieve of 120-325 meshes and 3 parts of polypropylene fibers with a length of 5mm are weighed and placed in a mixing device to be uniformly stirred and mixed, and the high-strength pressure-bearing plugging agent is obtained.
Example 6:
13.8 parts of PPS plastic particles with 14-20 meshes of a standard sample separating sieve, 9.2 parts of PPS plastic particles with 40-80 meshes of the standard sample separating sieve, 28 parts of expanded graphite particles with 40-80 meshes of the standard sample separating sieve, 42 parts of calcium carbonate powder with 120-325 meshes of the standard sample separating sieve and 7 parts of polypropylene fibers with 3mm of length are weighed and placed in a mixing device to be uniformly stirred and mixed, and the high-strength pressure-bearing plugging agent is obtained.
Example 7: evaluation of Performance
The product of the invention is evaluated in relevant performance, and the experimental contents are as follows:
the high-strength pressure-bearing plugging agent disclosed by the invention is subjected to pressure-bearing plugging effect evaluation by using a developed CL-2 high-temperature high-pressure plugging instrument. The core component of the leak stoppage instrument is a crack module, the crack module is formed by milling a groove after a steel column with the diameter of 10cm is split, the length of the crack module is 25cm, cement mortar is prepared, the cement mortar is poured on the crack surface to form a cement layer with a certain thickness for simulating a more real leak layer, and cracks with different widths can be formed by mutually combining the crack modules.
The experimental steps are as follows: preparing experimental plugging base slurry by using 4% of sodium bentonite, 3.5% of anhydrous sodium carbonate (the addition amount is calculated according to the mass of the bentonite) and 0.3% of tackifier according to a formula, wherein the sodium bentonite is general prepared slurry soil in the industry, has no special requirement on performance and can be obtained in the market; the anhydrous sodium carbonate is general industrial sodium carbonate for pulp preparation in the industry, has no special requirements on performance, and is available on the market; the tackifier is sodium carboxymethylcellulose (CMC-HV), is sourced from Tianrun chemical industry Co., Ltd, Ningchuu city, and executes the standard GB/T5005-2010, is a tackifier commonly used in the industry, has no special requirements on performance, is available in the market, and plays a role in improving the viscosity of the plugging base slurry and suspending the plugging material in experiments. And respectively adding 5-12% of the high-strength pressure-bearing plugging agent product into the plugging base slurry, and uniformly stirring to obtain the plugging slurry. And (3) installing a crack module, pouring the leaking stoppage slurry into a simulation device, connecting a pipeline, sealing, adding confining pressure to 10MPa, heating to 150 ℃, extruding the leaking stoppage slurry into a simulation crack by using a displacement pump, and observing and recording the loss and the filtered slurry amount. And after the experiment is finished, taking out the crack module when the temperature is reduced to the room temperature, and observing the leaking stoppage effect of the material in the crack.
In order to better illustrate the effect of the high-strength pressure-bearing plugging agent, the traditional pressure-bearing plugging agent product is prepared for comparison, and the formula of the high-strength pressure-bearing plugging agent is as follows, the traditional plugging product 1: weighing 13.2 parts of calcium carbonate particles with 14-20 meshes of a standard sample separating sieve, 9.8 parts of calcium carbonate particles with 40-80 meshes of the standard sample separating sieve, 30 parts of walnut shell particles with 40-80 meshes of the standard sample separating sieve, 45 parts of calcium carbonate powder with 120-325 meshes of the standard sample separating sieve and 3 parts of polypropylene fiber with 3mm length;
traditional leaking stoppage product 2: weighing 16.8 parts of walnut shell particles with 14-20 meshes of a standard sample separating sieve, 11.2 parts of walnut shell particles with 40-80 meshes of the standard sample separating sieve, 26 parts of calcium carbonate particles with 40-80 meshes of the standard sample separating sieve, 45 parts of limestone powder with 120-325 meshes of the standard sample separating sieve and 6 parts of polypropylene fibers with 3mm length. Meanwhile, a simulation experiment of the traditional plugging product is carried out, and compared with the plugging effect of the plugging agent disclosed by the invention, the result is shown in table 1.
TABLE 1 pressure-bearing plugging Effect of plugging agents in the examples of the present invention
Note: the amount of the plugging slurry for a single experiment is 4000 mL; the bearing value is more than or equal to 8MPa, which means that the plugging layer is not damaged when the pressure is increased to 8MPa, and the experimental pressure is not increased continuously for the safety.
The experimental result data in the table 1 show that the high-strength pressure-bearing plugging agent can effectively plug a crack leaking layer, a compact plugging section with a certain length is formed in the leaking layer, and the formed plugging layer can bear the pressure of more than 8 MPa. The traditional plugging material can form a resident in a crack, but a formed resident slug is broken down along with the increase of pressure, the pressure bearing value of the traditional plugging material is obviously lower than that of the plugging agent, the plugging slurry is finally and completely lost, and an effective resident slug is not formed in the crack. The PPS plastic particles have high strength, wear resistance and high temperature resistance, the graphite particles have good toughness and compressibility, and after the two materials are combined, the formed leaking stoppage slug has both high strength and good toughness, so that the leaking stoppage slug can effectively resist complicated pressure change at the bottom of a well and improve leaking stoppage timeliness, which is difficult to achieve by the traditional materials.
The change of the plugging material at high temperature is small, and the pressure-bearing plugging agent is not obviously changed under the action of high temperature and high pressure, so that the performance is stable, the material is compactly accumulated in the crack, and the pressure-bearing effect is good.
The above description is only a preferred embodiment of the present invention, and it should be noted that various modifications to these embodiments can be implemented by those skilled in the art without departing from the technical principle of the present invention, and these modifications should be construed as the scope of the present invention.
Claims (8)
1. A high-strength pressure-bearing plugging agent for well drilling comprises the following components in parts by mass:
20-30 parts of PPS plastic granular material;
15-30 parts of graphite particle materials;
35-45 parts of a filler particulate material;
3-10 parts of a fiber material;
the sum of the mass parts of all the components is 100;
the graphite particle material is selected from one or more of natural graphite particles and expanded graphite particles, and the size of the graphite particle material is 40-80 meshes of a standard sample sieve; the main component of the filling particle material is calcium carbonate or silicate.
2. The high-strength pressure-bearing plugging agent for well drilling as claimed in claim 1, wherein the PPS plastic particle material is selected from one or more of PPS plastic particles and reinforced PPS composite particles.
3. The high-strength pressure-bearing plugging agent for well drilling as claimed in claim 1, wherein the PPS plastic granular material comprises: a first granular material with a standard sample separating sieve of 14-20 meshes and a second granular material with a standard sample separating sieve of 40-80 meshes; the mass ratio of the first particle material to the second particle material is (4-2): 2.
4. the high-strength pressure-bearing plugging agent for drilling according to any one of claims 1 to 3, wherein the filling particle material is selected from one or more of calcium carbonate powder, limestone powder, shell powder and quartz sand.
5. The high-strength pressure-bearing plugging agent for well drilling as claimed in claim 4, wherein the size of the filling granular material is 120-325 meshes of a standard sample sieve.
6. The high-strength pressure-bearing plugging agent for well drilling according to any one of claims 1 to 3, wherein the fiber material is selected from one or more of sepiolite fibers and polymer fibers.
7. A high-strength pressure-bearing plugging agent for well drilling as claimed in claim 6, wherein the length of the fiber material is 2-5 mm, and the fiber diameter is 0.01-0.1 mm.
8. The application of the high-strength pressure-bearing plugging agent for drilling according to any one of claims 1 to 7 in drilling fluid plugging.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111849431A (en) * | 2020-07-29 | 2020-10-30 | 长江大学 | Composite plugging material for well drilling and application thereof |
| CN112080262A (en) * | 2020-09-11 | 2020-12-15 | 长江大学 | High-strength drilling composite plugging agent and preparation method thereof |
| CN113773816A (en) * | 2021-10-20 | 2021-12-10 | 中国海洋石油集团有限公司 | Leakage-proof drilling fluid material and using method thereof |
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| CN116042190B (en) * | 2022-11-09 | 2024-04-05 | 四川康荣石油化工科技有限公司 | High-efficiency plugging agent for drilling fluid and application thereof |
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