CN113429950A - High-strength support material for promoting crack sealing layer transformation and preparation method thereof - Google Patents
High-strength support material for promoting crack sealing layer transformation and preparation method thereof Download PDFInfo
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- CN113429950A CN113429950A CN202110770830.2A CN202110770830A CN113429950A CN 113429950 A CN113429950 A CN 113429950A CN 202110770830 A CN202110770830 A CN 202110770830A CN 113429950 A CN113429950 A CN 113429950A
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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
- C09K8/44—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing organic binders only
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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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/80—Compositions for reinforcing fractures, e.g. compositions of proppants used to keep the fractures open
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Abstract
The invention discloses a high-strength support material for promoting the conversion of a fracture plugging layer and a preparation method thereof, relating to the technical field of petroleum drilling materials, wherein the high-strength support material is preferably a plugging material with high friction coefficient, low sphericity and low acid solubility, and is prepared by the following method: weighing the plugging material, the resin, the absolute ethyl alcohol and the curing agent according to the mass ratio; heating and stirring to completely dissolve the resin in the absolute ethyl alcohol; adding a curing agent and a plugging material, and heating and stirring until the absolute ethyl alcohol is basically volatilized; the sample is dried to be in a semi-cured state, screened and then put to be in a full-cured state, and finally the high-strength support material which has the functions of plugging of a fractured reservoir and increasing permeability and transformation is obtained.
Description
Technical Field
The invention belongs to the technical field of petroleum drilling materials, and particularly relates to a high-strength support material for promoting the conversion of a crack sealing layer and a preparation method thereof.
Background
The well leakage is one of the complex engineering problems in the well drilling and completion process, and the fractured stratum is a high-occurrence section of the well leakage, so the well leakage can seriously damage a reservoir stratum and reduce the comprehensive benefit of well construction, and great difficulty is brought to the exploration and development of oil and gas resources. Statistically, nearly half of the known hydrocarbon reserves and the major geothermal reserves worldwide are located in fractured reservoirs. Due to the existence of a large number of natural fractures in a fractured oil-gas reservoir, the pressure bearing capacity of the stratum is weak, and well leakage often occurs in the processes of drilling, well completion and well repair. However, the natural fracture is not only a working fluid leakage channel but also a seepage channel in oil well production, and the natural fracture has a decisive control effect on the productivity of a fractured reservoir, particularly an unconventional fractured reservoir with extremely low matrix permeability. The more developed the natural fracture of the reservoir, the higher the individual well production of the hydrocarbon well in general.
The traditional plugging method generally adopts particle materials with multiple particle diameters, and the particle materials are compounded with fibrous materials and flaky materials to prepare bridge plugging slurry with a certain proportion and concentration, and the bridge plugging slurry enters a leakage layer to plug a leakage channel. However, the performance of the bridging plugging material which is generally adopted at present is poor. Plant materials such as walnut shells, cottonseed shells, sawdust and peanut shells have poor temperature resistance and corrosion resistance, and the pressure resistance and the plugging pressure-bearing capacity are obviously reduced under the action of high-temperature fluid at the bottom of a well; mineral materials such as calcium carbonate, shells and the like are too hard and brittle, and are easy to break under the pressure action of crack closing stress and the like, so that temporary success of plugging operation is caused, and in subsequent operation, a plugging layer is damaged due to deterioration or breakage of the plugging material, and the phenomenon of repeated leakage frequently occurs. The leakage of working fluid is controlled after the crack plugging layer is formed, severe reservoir damage is caused to the crack, although the damage can be removed to a certain degree through partial plugging removal operation, the originally opened crack is closed again after plugging removal, and the flow conductivity of the crack is greatly reduced. The existing plugging material for the fractured reservoir is difficult to play the roles of plugging fractures during drilling, supporting fractures during production and keeping the flow guide capability of the fractures.
Disclosure of Invention
In view of the above-mentioned deficiencies of the prior art, it is an object of the present invention to provide a high strength support material for promoting the transformation of a crack sealing layer, wherein the support material has high strength and is not easy to break under stress, and the formed crack sealing layer has high pressure bearing capacity; the spherical degree is low, the friction coefficient is high, the spherical supporting support is easy to remain in a crack, is beneficial to forming a crack plugging layer during drilling and production and a supporting layer during production; the acid dissolution is low, the material can keep enough granularity and pressure resistance after the acid dissolution plugging operation, can support the crack to open, keeps the crack flow conductivity, and is beneficial to reservoir production. The technical scheme adopted by the support material is as follows:
a high-strength support material for promoting the conversion of a crack sealing layer comprises a plugging material, resin and a curing agent, and comprises the following components in parts by weight:
100-150 parts of plugging material;
1-5 parts of resin;
0.2-1 part of curing agent;
the friction coefficient of the plugging material is more than 1.1, the sphericity is between 0.5 and 0.75, and the acid solubility is less than 5%.
Preferably, the resin is one or a combination of epoxy resin, acrylic resin and phenolic resin.
Preferably, the mass ratio of the resin to the plugging material is 1-5: 100.
Preferably, the curing agent is one or more of phenolic aldehyde amine, ethylenediamine, m-phenylenediamine, triethylene tetramine and phthalic anhydride.
Preferably, the mass ratio of the curing agent to the resin is 20-40: 100.
Another object of the present invention is to provide a method for preparing a high-strength support material for promoting the transformation of a fracture plugging layer, which is used for preparing the high-strength support material, and comprises the following steps:
(1) weighing the plugging material, the resin and the curing agent according to the mass ratio;
(2) mixing the resin with absolute ethyl alcohol, and heating and stirring to completely dissolve the resin in the absolute ethyl alcohol; the mass part of the absolute ethyl alcohol is 20-50 in parts by weight.
(3) After the resin is completely dissolved, adding a curing agent and a plugging material, and heating and stirring until the absolute ethyl alcohol is basically volatilized;
(4) and (3) putting the sample into an oven to be dried to be in a semi-cured state, screening, and then putting for 24 hours to be in a fully cured state to finally obtain the high-strength support material.
Preferably, the mass addition amount of the absolute ethyl alcohol is 20 times of the mass of the resin.
The invention has the following beneficial effects:
(1) the support material has the functions of plugging and permeation-increasing transformation of a fractured reservoir, has high strength, is not easy to break under the action of stress, has high pressure bearing capacity of a fracture plugging layer formed by the plugging slurry taking the support material as a bridging material, and is not easy to generate repeated leakage.
(2) The support material has low roundness and high friction coefficient, is easy to bridge in cracks to form a plugging layer in the drilling process, and is easy to retain the cracks to form a support layer in production.
(3) The supporting material has low acid dissolution rate, and the material can keep enough granularity and pressure resistance after acid dissolution plugging operation, can support the crack to open, keeps the crack flow conductivity and is beneficial to reservoir production.
Drawings
FIG. 1 is a graph of plugging performance of a support material according to example 1 of the present invention;
FIG. 2 is a pictorial representation of a proppant material of example 1 of the present invention forming a seal in fractured steel rock.
Detailed Description
First, an embodiment
The present invention will be described in detail with reference to specific examples.
The high-strength support material for promoting the conversion of the crack sealing layer provided by the embodiment is prepared from elm desert sand, oil-soluble epoxy resin E44, a curing agent T-31 and absolute ethyl alcohol, wherein the weight parts of the components are as follows:
specifically, the friction coefficient of the elm desert sand is 1.23, the average roundness is 0.72, and the acid dissolution rate is 3.4%.
The preparation method comprises the following specific steps:
(a) weighing 100g of elm desert sand, oil-soluble epoxy resin E441g, curing agent T-310.2g and absolute ethyl alcohol 40g according to the mass ratio;
(b) mixing the oil-soluble epoxy resin E44 with absolute ethyl alcohol, and heating and stirring to completely dissolve the oil-soluble epoxy resin E44 in the absolute ethyl alcohol;
(c) after the oil-soluble epoxy resin E44 is completely dissolved, adding the curing agent T-31 and the elm desert sand, and heating and stirring until the absolute ethyl alcohol is basically volatilized;
(d) and (3) putting the sample into an oven to be dried to be in a semi-cured state, screening, and then putting for 24 hours to be in a fully cured state, thereby finally obtaining the high-strength material which gives consideration to the plugging and permeation increasing transformation effects of the fractured reservoir.
Second, performance test
The high-strength support material for promoting the conversion of the crack sealing layer prepared in the example 1 is used for carrying out the compression resistance test, and the test process is as follows: weighing 30g of support material, laying the support material at the bottom of a crushing chamber, putting a steel piston into the crushing chamber, rotating the steel piston clockwise for 180 degrees to ensure that the material is laid in the crushing chamber, and putting the crushing chamber on a panel of an automatic pressurizing machine; secondly, applying vertical pressure to the piston at the speed of 100N/S by using an automatic pressurizer, keeping the pressure applied to the material unchanged at 30MPa when the pressure applied to the material is 30MPa, unloading the pressure of the hydraulic press after 5min, and taking out the support material in the crushing chamber; thirdly, measuring the mass of the support material after being pressed by an electronic balanceIs M0Putting the pressed rigid plugging material into a screen group with a lower limit mesh number for sieving and analyzing for 10min, taking the rigid plugging material passing through the screen with the lower limit mesh number as a crushing material, and measuring the mass Mi of the crushed part of the pressed rigid plugging material by using an electronic balance, wherein the crushing rate is Mi/M0.
The results of the friction coefficient, sphericity, and acid solubility of the support materials tested are shown in table 1.
Table 1 table for measuring properties of support material
| Sample (I) | Breaking at 30 MPa/% | Coefficient of friction | Average sphericity | Acid solubility/% |
| Desert sand of Yuanlin | 24.08 | 1.23 | 0.72 | 3.4％ |
| Example 1 | 2.70 | 1.18 | 0.74 | 3.8％ |
The high-strength support material for promoting the conversion of the crack sealing layer prepared in the example 1 is used for testing the sealing performance, and the test process and the result are as follows: the supporting material is added into the water-based drilling fluid, the mass addition amount is 5% of the water-based drilling fluid, and the experimental fluid is prepared. Putting a steel rock sample with a seam width of 1.5-0.5 mm into a holder, applying confining pressure to 20MPa, adding prepared experimental liquid into a working liquid kettle body, starting an electric stirrer, setting the rotating speed to be 150r/min, opening a gas cylinder and a pressure regulating valve at the inlet end of the kettle body, regulating the pressure in the kettle body to 1.5MPa, opening a valve at the outlet end of a rock core after 1min, measuring initial leakage, increasing the pressure in the kettle body by a gradient of 2.0MPa after the leakage is stabilized, keeping the pressure for a certain time, measuring the accumulated leakage, rapidly increasing the accumulated leakage when the pressure in the kettle body reaches a certain pressure point, rapidly decreasing the pressure in the kettle body, and recording a previous pressure point as the bearing capacity of a plugging layer when the pressure in the kettle body is not recovered, wherein the pressure in the kettle body is considered to be failed in plugging, the experiment is stopped, and fig. 2 is a real object diagram of the plugging layer formed in the fractured steel rock by the supporting material. The final plugging pressure curve and the cumulative leakage curve are shown in figure 1.
The above experimental results show that: the high-strength support material for promoting the conversion of the crack sealing layer has high pressure resistance and is not easy to break under the action of high stress, and the pressure bearing capacity of the crack sealing layer formed by taking the rigid plugging material of the crack leakage stratum as a bridging material is more than 15MPa, so that the plugging effect of the invention is proved to be good. The acid dissolution rate is low, the friction coefficient is high, the material can keep enough granularity and pressure resistance after acid dissolution operation, and the crack opening can be effectively supported.
The method of the present invention has been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, which are only illustrative and not restrictive, and those skilled in the art can flexibly modify the experimental conditions and analysis methods and objects within the scope not exceeding the gist of the present invention, within the scope of the present invention.
Claims (7)
1. The high-strength support material for promoting the conversion of the crack sealing layer is characterized by comprising a plugging material, resin and a curing agent, wherein the high-strength support material comprises the following components in parts by weight:
100-150 parts of plugging material;
1-5 parts of resin;
0.2-1 part of curing agent;
the friction coefficient of the plugging material is more than 1.1, the sphericity is 0.5-0.75, and the acid solubility is less than 5%.
2. The high-strength support material for promoting the conversion of a fracture sealing layer according to claim 1, wherein the resin is a combination of one or more of epoxy resin, acrylic resin and phenolic resin.
3. The high-strength supporting material for promoting the transformation of the fracture plugging layer according to claim 1, wherein the mass ratio of the resin to the plugging material is 1-5: 100.
4. The high-strength supporting material for promoting the conversion of the fracture plugging layer according to claim 1, wherein the curing agent is one or more of phenolic amine, ethylenediamine, m-phenylenediamine, triethylenetetramine and phthalic anhydride.
5. The high-strength supporting material for promoting the conversion of the crack sealing layer according to claim 1, wherein the mass ratio of the curing agent to the resin is 20-40: 100.
6. A method for preparing a high-strength support material for promoting the transformation of a fracture plugging layer, which is used for preparing the high-strength support material according to any one of claims 1 to-5, and is characterized by comprising the following steps:
(1) weighing the plugging material, the resin and the curing agent according to the mass ratio;
(2) mixing the resin with absolute ethyl alcohol, and heating and stirring to completely dissolve the resin in the absolute ethyl alcohol;
(3) after the resin is completely dissolved, adding a curing agent and a plugging material, and heating and stirring to volatilize the absolute ethyl alcohol;
(4) and (3) putting the sample into an oven to be dried to be in a semi-cured state, screening, and then putting for 24h to be in a fully cured state to finally obtain the high-strength support material for promoting the conversion of the crack sealing layer.
7. The method for preparing a high-strength supporting material for promoting the conversion of a fracture-plugging layer according to claim 6, wherein the mass ratio of the absolute ethyl alcohol to the resin is 20: 1.
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| CN202110770830.2A CN113429950A (en) | 2021-07-08 | 2021-07-08 | High-strength support material for promoting crack sealing layer transformation and preparation method thereof |
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| US6257335B1 (en) * | 2000-03-02 | 2001-07-10 | Halliburton Energy Services, Inc. | Stimulating fluid production from unconsolidated formations |
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| CN111621284A (en) * | 2020-06-05 | 2020-09-04 | 西南石油大学 | Water-control scale-inhibition coated proppant and preparation method thereof |
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2021
- 2021-07-08 CN CN202110770830.2A patent/CN113429950A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6257335B1 (en) * | 2000-03-02 | 2001-07-10 | Halliburton Energy Services, Inc. | Stimulating fluid production from unconsolidated formations |
| WO2002026656A1 (en) * | 2000-09-28 | 2002-04-04 | Fairmount Minerals Ltd | Proppant composition for gas and oil-well fracturing |
| CN103043947A (en) * | 2012-12-27 | 2013-04-17 | 亿利沙材料科技有限责任公司 | Tectorial membrane proppant as well as preparation method and application thereof |
| CN103160271A (en) * | 2012-12-28 | 2013-06-19 | 北京仁创科技集团有限公司 | Preparation method for lumpish sand prevention proppant |
| CN104533375A (en) * | 2014-12-26 | 2015-04-22 | 中国石油天然气股份有限公司 | Fracturing transformation method for natural fractured reservoir |
| CN106281272A (en) * | 2015-05-26 | 2017-01-04 | 中国石油化工股份有限公司 | A kind of fracture-type reservoir bridge joint sealing agent and preparation method and application |
| CN108751915A (en) * | 2018-06-28 | 2018-11-06 | 中国石油天然气股份有限公司 | Water plugging fracturing tectorial membrane proppant for bottom water reservoir and preparation method |
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| CN111621284A (en) * | 2020-06-05 | 2020-09-04 | 西南石油大学 | Water-control scale-inhibition coated proppant and preparation method thereof |
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Application publication date: 20210924 |