CN113136183A - Base liquid composition of chemical rubber plug, chemical rubber plug composition, chemical rubber plug and application process of chemical rubber plug - Google Patents
Base liquid composition of chemical rubber plug, chemical rubber plug composition, chemical rubber plug and application process of chemical rubber plug Download PDFInfo
- Publication number
- CN113136183A CN113136183A CN202010067654.1A CN202010067654A CN113136183A CN 113136183 A CN113136183 A CN 113136183A CN 202010067654 A CN202010067654 A CN 202010067654A CN 113136183 A CN113136183 A CN 113136183A
- Authority
- CN
- China
- Prior art keywords
- rubber plug
- chemical rubber
- chemical
- parts
- composition
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
- E21B33/134—Bridging plugs
-
- 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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/12—Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Chemical & Material Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention provides a base liquid composition of a chemical rubber plug, the chemical rubber plug composition, the chemical rubber plug and an application process thereof. The base liquid composition for the chemical rubber plug comprises, by weight, 0.005-0.08 parts of a delayed crosslinking agent, 0.5-1.2 parts of a thickening agent and 98-99 parts of water. The base liquid composition of the chemical rubber plug prolongs the addition of the cross-linking agent, prolongs the cross-linking time of the high-viscosity rubber plug, improves the plugging effect, reduces the construction friction resistance and simultaneously overcomes the problem of rapid reduction of the high-temperature shearing viscosity of the chemical rubber plug, thereby realizing the purpose of efficiently controlling the height and the morphological development of the fracturing artificial crack. And the base liquid composition of the chemical rubber plug has simple formula, the raw materials are cheap and easy to obtain, and the production cost is reduced to a certain extent.
Description
Technical Field
The invention relates to the technical field of oil and gas field development, in particular to a base liquid composition of a chemical rubber plug, a chemical rubber plug composition, a chemical rubber plug and an application process thereof.
Background
Hydraulic fracturing is an important measure for increasing the yield of an oil-gas well and increasing the injection of a water well, the aim of increasing the yield and the injection can be achieved by forming artificial fractures to reduce the flow resistance of fluid, but the height and the form of the artificial fractures are one of key factors influencing the fracturing effect. Firstly, when the production layer has no shielding layer or the shielding layer has insufficient strength and thickness, the crack is easy to break through the extension of the interlayer, penetrates the shielding layer and even penetrates the shielding layer to form a top-standing type crack, so that the extension of the artificial crack in the horizontal direction is restricted, and the effective transformation volume is reduced. Secondly, under the condition that the upper part and the lower part of the target layer contain water, the water layer is easy to communicate, the water content is increased after the fracturing, and the fracturing effect is seriously influenced. In addition, in the micro-fracture development of a near-wellbore zone or the fracturing construction of a high-angle fractured reservoir, natural fractures can be preferentially opened and are communicated with one another to form fracture channels, so that artificial fractures do not extend strictly along the direction of the maximum principal stress any more, the spatial form of the artificial fractures is influenced, the artificial fractures are narrow, and meanwhile, along with the preferential opening and activation of the natural fractures, fracturing fluid is seriously lost in the natural fracture channels, so that the sand-carrying fracturing fluid is desanded in the artificial fractures, and the sand blocking risk is increased. Therefore, a process technology capable of efficiently controlling the development form of the artificial crack is urgently needed to be developed, and favorable conditions are created for the development of the form of the artificial crack and the increase of the effective modification volume.
The technology adopts slick water to carry ceramsite or ceramsite with different particle sizes to enter a stratum and then stops a pump to promote the sedimentation of the ceramsite, forms an artificial interlayer near a seam, simultaneously reduces construction scale, construction discharge capacity and liquid viscosity, enables proppant sand at each level to shield a rear section in advance, forms a high-strength artificial interlayer, changes a stress state, and achieves the purpose of effectively controlling the height of the lower seam and extending to prevent the communication of a lower water body. Although the technology mainly aims at controlling extension of lower fracture height of a fractured reservoir, the adopted technical means is that the ceramsite or the ceramsite with different particle sizes are combined to form a high-strength artificial interlayer so as to achieve the purpose of controlling the fracture height, the method mainly aims at a carbonate reservoir, is mainly used for controlling the fracture height and preventing vertical extension of fractures, so that bottom water communication is avoided, but the problem that sand-carrying fracturing fluid desands in the artificial fractures due to the fact that natural fractures preferentially open to form fracture channels for the microcrack development or high-angle fractured reservoir in a near-wellbore area cannot be solved.
In addition, in the chinese patent application with the patent application publication No. CN102061152A, a high-strength controllable gel breaking chemical temporary plugging liquid rubber plug is disclosed, which can resist 60 ℃ and the gel forming time can be adjusted within 2-50 min, and the gel breaking hydration can be controlled within the required time. The pressure difference of the fracturing construction can be borne by more than 15MPa, the high-strength chemical liquid rubber plug is used for realizing the effect of sealing down and pressing up in the fracturing construction, and the mechanical packer can be replaced to effectively plug a target layer for conventional fracturing construction. However, the patent only realizes the packing in the shaft, cannot realize the effective packing of the natural cracks in the reservoir, and cannot effectively control the extension of the artificial cracks in the longitudinal direction in the reservoir fracturing construction without a shielding layer or without enough strength and thickness of the shielding layer for the production layer.
Disclosure of Invention
The invention mainly aims to provide a base liquid composition of a chemical rubber plug, the chemical rubber plug composition, the chemical rubber plug and an application process thereof, and aims to solve the problem that the height and morphological development of a fracturing artificial crack cannot be efficiently controlled in the prior art.
In order to achieve the above object, according to one aspect of the present invention, there is provided a base fluid composition for a chemical rubber plug, comprising, by weight, 0.005 to 0.08 parts of a delayed crosslinking agent, 0.5 to 1.2 parts of a thickening agent, and 98 to 99 parts of water.
Further, the delayed crosslinking agent is one or more of glycerol, citric acid, sodium gluconate and potassium gluconate.
Further, the thickening agent is guar gum, preferably guar gum is one or two of carboxymethyl guar gum and hydroxypropyl guar gum.
Further, the base fluid composition also comprises an additive, preferably the additive is one or more of an anti-swelling agent, a demulsifier and a cleanup additive.
Furthermore, the anti-swelling agent is one or more of inorganic clay anti-swelling agent, organic clay anti-swelling agent, cationic water-soluble polymer and polyquaternary ammonium salt anti-swelling agent, and the anti-swelling agent is preferably 0.1-6 parts by weight.
Further, the demulsifier is one or more of polyoxyethylene polyoxypropylene polyether, polyoxyethylene oleate and polymeric carboxylate, and the preferable demulsifier is 0.1-1 part by weight.
Further, the cleanup additive is one or more of a fluorocarbon surfactant, a salt cleanup additive and an organic silicon cleanup additive, and the cleanup additive is preferably 0.1-1 part by weight.
According to another aspect of the invention, a chemical rubber plug composition is provided, which comprises 100 parts by weight of a chemical rubber plug base liquid component, wherein the chemical rubber plug base liquid component comprises any one of the base liquid compositions, 1.0-1.5 parts by weight of a chemical rubber plug cross-linking liquid component and 0.001-0.4 part by weight of a gel breaker.
Further, the chemical rubber plug crosslinking liquid comprises, by weight, 20-60 parts of a crosslinking agent, 5-30 parts of a high-temperature stabilizer, 1-8 parts of a pH regulator and 10-42 parts of water.
Further, the crosslinking agent is one or more of an organic boron crosslinking agent, an organic zirconium crosslinking agent and an organic aluminum crosslinking agent.
Further, the high-temperature stabilizer is a mixture of zirconium oxide and glycerol at 140 ℃, wherein the mass ratio of zirconium oxide to glycerol is 1: 1.
Further, the pH regulator is one or more of sodium carbonate, potassium carbonate, sodium hydroxide and potassium hydroxide.
Further, the gel breaker is one or more of biological enzyme, sodium persulfate, ammonium persulfate and capsule gel breaker.
According to another aspect of the present invention, there is provided a chemical rubber plug, which is prepared from the chemical rubber plug composition, wherein the chemical rubber plug composition is any one of the chemical rubber plug compositions described above.
According to another aspect of the invention, an application process of a chemical rubber plug is provided, which comprises the steps of pre-liquid slotting, chemical rubber plug plugging, water-based fracturing fluid breakthrough dredging, sand-carrying fluid sand adding and displacement fluid displacement in sequence, wherein the chemical rubber plug is any one of the chemical rubber plugs.
Furthermore, the injection discharge capacity of the chemical rubber plug in the plugging of the chemical rubber plug is 0.8-2 m3/min。
Further, the method comprises the step of stopping the pump after the chemical rubber plug is plugged and before the water-based fracturing fluid breaks through and is dredged, and the preferred time for stopping the pump is 10-30 min.
By applying the technical scheme of the invention, the thickening agent has the effect of quick thickening, but if the base solution of the high-viscosity chemical rubber plug formed by only taking the thickening agent as the base solution composition is mixed with the chemical rubber plug crosslinking solution composition with the crosslinking effect, the rubber plug is gelatinized when not reaching the crack due to the excessively fast crosslinking time of the formed chemical rubber plug, so that the plugging effect is reduced, and the construction friction resistance is further increased. However, the base liquid composition of the chemical rubber plug prolongs the addition of the cross-linking agent, prolongs the cross-linking time of the high-viscosity rubber plug, improves the plugging effect, reduces the construction friction resistance and overcomes the defects of the high-viscosity rubber plug of the chemical rubber plugThe problem of rapid decrease of the warm shear viscosity is solved, and the dosage of the crosslinking agent and the thickening agent is controlled within the range, so that the base liquid composition of the prepared chemical rubber plug has higher viscosity, and the corresponding chemical rubber plug comprising the base liquid composition has the viscosity of 170s at 100 DEG C-1The temperature and shear resistant viscosity of the fracturing artificial crack is kept above 500mPa & s after the fracturing is continuously carried out for 90min, so that the aim of efficiently controlling the height and morphological development of the fracturing artificial crack is fulfilled.
The proportion of the base liquid composition of the chemical rubber plug can control the effect of the base liquid of the formed chemical rubber plug and the cross-linking liquid composition of the chemical rubber plug, thereby improving the plugging effect. And the base liquid composition of the chemical rubber plug has simple formula, the raw materials are cheap and easy to obtain, and the production cost is reduced to a certain extent.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
figure 1 shows a schematic view of a test example 11 of the viscosity as a function of temperature of a chemical plug according to the invention;
fig. 2 shows a process flow diagram for the use of a chemical plug according to the present invention;
FIG. 3 shows a fracture construction graph of application example 12 of the chemical plug; and
fig. 4 shows a schematic view of a process implementation of the chemical plug, wherein the above figures include the following reference numerals:
1. artificial cracking; 2. a chemical rubber plug; 3. a reservoir; 4. and fracturing the well.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As analyzed by the background technology, the problem that the height and morphological development of a fracturing artificial crack cannot be efficiently controlled in the prior art is solved, and in order to solve the technical problem, the invention provides a base liquid composition of a chemical rubber plug, a chemical rubber plug composition, a chemical rubber plug and an application process thereof.
In a typical embodiment of the present application, a base fluid composition for a chemical rubber plug is provided, which comprises, by weight, 0.005 to 0.08 parts of a delayed crosslinking agent, 0.5 to 1.2 parts of a thickening agent, and 98 to 99 parts of water.
The thickening agent has the effect of quick thickening, but when the base liquid of the high-viscosity chemical rubber plug formed only by taking the thickening agent as the base liquid composition is mixed with the chemical rubber plug cross-linking liquid composition with the cross-linking effect, the rubber plug is gelatinized when not reaching the crack due to the too fast cross-linking time of the formed chemical rubber plug, so that the plugging effect is reduced, and the construction friction resistance is increased. However, the base liquid composition of the chemical rubber plug prolongs the crosslinking time of the high-viscosity rubber plug, improves the plugging effect, reduces the construction friction resistance and simultaneously overcomes the problem of rapid reduction of the high-temperature shearing viscosity of the chemical rubber plug due to the delayed addition of the crosslinking agent, and the dosage of the delayed crosslinking agent and the thickening agent is controlled in the range, so that the prepared base liquid composition of the chemical rubber plug has higher viscosity, and the corresponding chemical rubber plug comprising the base liquid composition has the viscosity of 170s at 100 ℃-1The temperature and shear resistant viscosity of the fracturing artificial crack is kept above 500mPa & s after the fracturing is continuously carried out for 90min, so that the aim of efficiently controlling the height and morphological development of the fracturing artificial crack is fulfilled.
The proportion of the base liquid composition of the chemical rubber plug can control the effect of the base liquid of the formed chemical rubber plug and the cross-linking liquid composition of the chemical rubber plug, thereby improving the plugging effect. And the base liquid composition of the chemical rubber plug has simple formula, the raw materials are cheap and easy to obtain, and the production cost is reduced to a certain extent.
In order to enable the delayed crosslinking agent to play a better effect of delaying crosslinking in a corresponding chemical rubber plug, the rubber plug is ensured to be gelled after reaching a crack, and thus the purpose of controlling the height and morphological development of a fracturing artificial crack is achieved. Preferably, the delayed crosslinking agent is one or more of glycerol, citric acid, sodium gluconate and potassium gluconate.
Guar gum, the most effective and most water-soluble natural hydrocolloid known, forms a gel when it comes into contact with water and forms a highly viscous solution at low concentrations, achieving a rapid thickening effect. In order to improve the thickening effect of the thickening agent, the base fluid composition of the chemical rubber plug with high viscosity is rapidly formed, preferably, the thickening agent is guar gum, and preferably, the guar gum is one or two of carboxymethyl guar gum and hydroxypropyl guar gum.
In one embodiment of the present application, the base fluid composition further comprises an additive, preferably the additive is one or more of an anti-swelling agent, a demulsifier, and a cleanup additive.
In order to improve the compatibility of the chemical rubber plug prepared from the base fluid composition with the stratum and crude oil fluid and reduce stratum water sensitivity and generation of particle precipitation, one or more of an anti-swelling agent and a demulsifier can be added into the base fluid composition to be used as an additive according to the properties of different stratums. The addition of the cleanup additive is helpful for discharging the working residual liquid after the plugging effect is completed out of the reservoir of the oil-gas well, and reduces the harm of the chemical rubber plug to the stratum and the pollution of the chemical rubber plug to oil gas.
Preferably, the anti-swelling agent is one or more of an inorganic clay anti-swelling agent, an organic clay anti-swelling agent, a cationic water-soluble polymer and a polyquaternary ammonium salt anti-swelling agent, and the anti-swelling agent is preferably 0.1-6 parts by weight.
The anti-swelling agent is firmly adsorbed on the surface of clay through the actions of intermolecular force, hydrogen bond force and the like, can prevent the hydration expansion and the dispersion migration of clay minerals in a reservoir stratum, greatly improves the apparent water absorption index of oilfield flooding, and enters clay mineral layers due to the unique rigid structure to achieve the effect of efficiently and stably maintaining the reservoir stratum under the action of various chemical forces. In order to further improve the compatibility of the anti-swelling agent and the soil layer, the anti-swelling agent is preferably 0.1-6 parts by weight.
The demulsifier can reduce the emulsification of crude oil, thereby reducing the generation of water-in-oil emulsion and improving the flow property of the crude oil. In order to improve the effect of the demulsifier, the demulsifier is preferably one or more of polyoxyethylene polyoxypropylene polyether, polyoxyethylene oleate and polymeric carboxylate. In order to further improve the compatibility of the demulsifier and the crude oil fluid, 0.1-1 part of the demulsifier is preferably selected according to the parts by weight.
The cleanup additive can help the residual liquid of the gel breaking liquid in the fracturing operation process of an oil well to flow back to the stratum, and in order to improve the flow back effect of the cleanup additive, the cleanup additive is preferably one or more of a fluorocarbon surfactant, a salt cleanup additive and an organic silicon cleanup additive, and the cleanup additive is preferably 0.1-1 part by weight.
In another exemplary embodiment of the present application, a chemical rubber plug composition is provided, which comprises 100 parts by weight of a chemical rubber plug base fluid component, wherein the chemical rubber plug base fluid component is any one of the base fluid compositions described above; 1.0-1.5 parts of a chemical rubber plug crosslinking liquid component; and 0.001-0.4 parts of a gel breaker.
This application is at first independent preparation chemical plug base fluid component, chemical plug cross-linking liquid component separately, and in order to reach the effect to the temporary shutoff of artifical crack and natural crack, mix the existing usefulness when using now, with the cross-linking time of better control chemical plug, wherein delay the cross-linking agent and can play the effect of the cross-linking time of high-efficient extension chemical plug, thereby improve the shutoff effect of high-efficient control chemical plug, chemical plug base fluid wherein, behind the effect of the temporary shutoff of strong gel completion that chemical plug cross-linking liquid component formed, the gel breaker of interpolation can make the gel break the hydration of glue in a certain time.
In order to improve the synergistic effect of the chemical rubber plug crosslinking liquid component and the base liquid component, control the crosslinking time of the formed chemical rubber plug and efficiently control the high-temperature shear viscosity, the chemical rubber plug crosslinking liquid component preferably comprises 20-60 parts of a crosslinking agent, 5-30 parts of a high-temperature stabilizer, 1-8 parts of a pH regulator and 10-42 parts of water.
The function of the cross-linking agent is to convert the linear or slightly branched chain macromolecule into a three-dimensional network structure, thereby improving the strength of the chemical rubber plug and increasing the wear resistance of the chemical rubber plug. In order to more fully exert the above-mentioned function of the crosslinking agent, the crosslinking agent is preferably one or more of an organic boron crosslinking agent, an organic zirconium crosslinking agent, and an organic aluminum crosslinking agent.
The high-temperature stabilizer helps to keep the original rheological property and filtration loss of the chemical rubber plug under the condition of increasing the temperature, and prevents the chemical rubber plug from degrading or deteriorating at the high temperature, so that the blocking effect of the chemical rubber plug is influenced, and in order to improve the stability of the chemical rubber plug at the high temperature, the high-temperature stabilizer is preferably a mixture of zirconium oxide and glycerol at 140 ℃, wherein the mass ratio of the zirconium oxide to the glycerol is 1: 1.
The pH value of the chemical rubber plug cross-linking liquid component is adjusted, so that the synergistic effect of the chemical rubber plug cross-linking liquid component and the base liquid component is improved, the effects of the chemical rubber plug cross-linking liquid component and the base liquid component are exerted more fully, and the pH adjusting agent is preferably one or more of sodium carbonate, potassium carbonate, sodium hydroxide and potassium hydroxide.
The chemical rubber plug not only needs to be controlled to form jelly in a certain time, but also needs to be capable of breaking the jelly and hydrating after the jelly is formed to finish the plugging effect, so that a channel is formed to be convenient for filling sand to support and stabilize a crack. In addition, the gel breaking hydration of the gel is beneficial to reducing the blockage of the gel on rock pores and sand filling cracks and increasing the flow conductivity of oil gas. In order to achieve the gel breaking effect of the jelly, the gel breaker is preferably one or more of biological enzyme, sodium persulfate, ammonium persulfate and capsule gel breaker.
In another exemplary embodiment of the present application, a chemical rubber plug is provided, which is prepared from a chemical rubber plug composition, wherein the chemical rubber plug composition is any one of the chemical rubber plug compositions described above. The chemical rubber plug is beneficial to realizing the high-efficiency control of the height and the morphological development of the fracturing artificial crack in the oil well.
In another exemplary embodiment of the present application, a process for applying a chemical rubber plug is provided, which comprises the steps of pre-fluid crack initiation, chemical rubber plug plugging, water-based fracturing fluid breakthrough dredging, sand-carrying fluid sand-adding, and displacement fluid displacement, in this order, wherein the chemical rubber plug is any one of the aforementioned chemical rubber plugs.
The application process of the chemical rubber plug comprises the steps of firstly injecting a certain amount of fracturing pad fluid into a fracturing well (such as a fracturing well shown as the reference numeral 4 in the attached figure 4) to form an artificial fracture, such as the artificial fracture shown as the reference numeral 1 in the attached figure 4. Injecting the chemical rubber plug with high viscosity (such as the reference numeral 2 in figure 4 represents the chemical rubber plug) in the application is used for filling artificial cracks and natural cracks of a near wellbore zone in the longitudinal direction and the transverse direction so as to plug the artificial cracks and the natural cracks. And then injecting water-based fracturing fluid (stepped low-displacement trial extrusion) into the fracturing well for breaking through the high-viscosity rubber plug area and controlling the water-based fracturing fluid to longitudinally flow to form a proppant conveying channel so as to provide a liquid inlet channel for later-stage sand-carrying fracturing fluid. And then injecting sand-carrying fracturing fluid into the construction well to form an artificial diversion crack. And finally, injecting a displacement fluid into the fracturing well, and cleaning sand in the shaft, so that the morphological development of the artificial crack is controlled, and the purposes of increasing the production and injection are achieved.
In order to control the cross-linking time of the chemical rubber plug, the injection discharge capacity of the chemical rubber plug in the plugging of the chemical rubber plug is preferably 0.8-2 m3/min。
In order to facilitate the crosslinking of the chemical rubber plug base liquid and the chemical rubber plug crosslinking liquid and form strong jelly glue, thereby plugging artificial cracks and natural cracks. Preferably, the method comprises the step of stopping the pump after the chemical rubber plug is plugged and before the water-based fracturing fluid breaks through and is dredged, and the time for stopping the pump is preferably 10-30 min.
The beneficial effects of the present application will be described below with reference to specific examples and comparative examples.
Preparation example of base fluid composition of chemical plug:
example 1
Stirring 0.005 parts of sodium gluconate, 0.5 parts of hydroxypropyl guar gum, 98 parts of water, 0.1 part of inorganic clay anti-swelling agent, 0.1 part of polyoxyethylene polyoxypropylene polyether and 0.1 part of fluorocarbon surfactant at the stirring speed of 1500r/min for 8min to obtain the base liquid composition of the chemical rubber plug.
Example 2
Stirring 0.05 parts of sodium gluconate, 0.8 parts of hydroxypropyl guar gum, 98.5 parts of water, 3 parts of inorganic clay anti-swelling agent, 0.5 part of polyoxyethylene polyoxypropylene polyether and 0.5 part of fluorocarbon surfactant at the stirring speed of 1500r/min for 8min to obtain the base liquid composition of the chemical rubber plug.
Example 3
Stirring 0.08 part of sodium gluconate, 1.2 parts of hydroxypropyl guar gum, 99 parts of water, 6 parts of inorganic clay anti-swelling agent, 1 part of polyoxyethylene polyoxypropylene polyether and 1 part of fluorocarbon surfactant at the stirring speed of 1800r/min for 15min to obtain the base liquid composition of the chemical rubber plug.
Comparative example 1
Stirring 0.003 part of sodium gluconate, 0.4 part of hydroxypropyl guar gum, 98 parts of water, 0.1 part of inorganic clay anti-swelling agent, 0.1 part of polyoxyethylene polyoxypropylene polyether and 0.1 part of fluorocarbon surfactant at the stirring speed of 1500r/min for 8min to obtain the base liquid composition of the chemical rubber plug.
The base liquid compositions of the chemical rubber plugs prepared in the above examples 1 to 3 and comparative example 1 were tested for viscosity, viscosity retention rate and swelling ratio at different times by using a six-speed rotational viscometer, and the specific test results are shown in table 1.
TABLE 1
Preparation example of cross-linking liquid component of chemical plug:
example 4
60 parts of BCL-61, 30 parts of a mixture of zirconium oxide and glycerol at 140 ℃ (the mass ratio of zirconium oxide to glycerol is 1:1), 8 parts of sodium hydroxide and 42 parts of water are mixed to obtain the chemical rubber plug crosslinking liquid component.
Example 5
20 parts of BCL-61, 5 parts of a mixture of zirconium oxide and glycerol at 140 ℃ (the mass ratio of zirconium oxide to glycerol is 1:1), 4 parts of sodium hydroxide and 10 parts of water are mixed to obtain the chemical rubber plug crosslinking liquid component.
Example 6
50 parts of BCL-61, 25 parts of a mixture of zirconium oxide and glycerol at 140 ℃ (the mass ratio of zirconium oxide to glycerol is 1:1), 5 parts of sodium hydroxide and 20 parts of water are mixed to obtain the chemical rubber plug crosslinking liquid component.
Preparation example of chemical plug:
example 7
100 parts of the base liquid composition of the chemical rubber plug obtained in example 3 and 1 part of the cross-linking liquid composition of the chemical rubber plug obtained in example 4 are mixed and fully stirred to form the chemical rubber plug A.
Example 8
100 parts of the base liquid composition of the chemical rubber plug obtained in example 3 and 1.5 parts of the cross-linking liquid composition of the chemical rubber plug obtained in example 4 are mixed and fully stirred to form the chemical rubber plug B.
Example 9
100 parts of the base liquid composition of the chemical rubber plug obtained in example 3 and 1.2 parts of the cross-linking liquid composition of the chemical rubber plug obtained in example 4 are mixed and fully stirred to form a chemical rubber plug C.
Example 10
100 parts of the base liquid composition of the chemical rubber plug obtained in the comparative example 1 and 1.2 parts of the cross-linking liquid composition of the chemical rubber plug obtained in the example 4 are mixed and fully stirred to form a chemical rubber plug D.
The chemical plugs obtained in examples 7 to 10 were tested for temperature resistance and shear resistance and are listed in table 2.
TABLE 2
In addition, in comparative example 1, the addition amount of the sodium gluconate serving as a delayed crosslinking agent is too small, so that the crosslinking of the chemical rubber plug obtained by mixing the base liquid composition of the chemical rubber plug obtained by using the sodium gluconate and the crosslinking liquid composition of the chemical rubber plug obtained in example 4 is too fast, and then the strong jelly is formed before the chemical rubber plug reaches the destination, so that the temporary plugging effect on artificial cracks and natural cracks is not achieved.
Test examples of viscosity of chemical plugs as a function of temperature:
example 11
Using a high temperature rheometer at 100 ℃ for 170s-1And (3) continuously shearing for 90min, carrying out a temperature resistance and shear resistance test (the shear viscosity changes along with the temperature) on the chemical rubber plug C, wherein the test curve is shown in figure 2, and the viscosity of the fracturing fluid is always kept above 500mPa & s at 100 ℃ as can be seen from the temperature resistance and shear resistance test.
Application example of chemical rubber plug:
the process implementation schematic diagram of the chemical rubber plug is shown in figure 4, according to the characteristics of the chemical rubber plug, a process technology for controlling the crack track of a high-viscosity rubber plug, which is shown in figure 2, of pre-liquid slotting, chemical rubber plug plugging, pump stopping, water-based fracturing fluid breakthrough dredging, sand carrying fluid adding and displacement fluid replacing is formed, and in order to ensure the effective control of the high-viscosity chemical rubber plug on the artificial crack track in the construction process, the chemical rubber plug is 0.8-2 m3And injecting the fracturing fluid into the oil well at a low displacement per minute, wherein the injection amount is 8-12% of the using amount of the fracturing fluid pad fluid, and the embodiment of the fracturing fluid pad fluid is specifically applied to the oil well as follows.
Example 12
When the Xinjiang oil field exploration well is applied to a certain well site, the reservoir cracks of the perforated layer section (S1 layer 2770-2778 m) of the well are relatively developed, and the upper cracks and the lower cracks of a target layer are underdeveloped; the lithology of the target layer is andesite, the upper part is a gravel tuff/andesite interbed, and the lower part is mainly tuff and is clamped with the andesite interbed. The shielding of the upper and lower stress of the target layer is weaker (2-5 MPa).
In the fracturing process, the high-viscose plug control technology is adopted in the design considering that lithology and stress shielding are weak, and the artificial crack seam is highly increased. First, use 25m3Making a crack by using a conventional fracturing fluid pad, and then using 2m3Low-displacement injection per hour (25 m)3The chemical rubber plug base fluid in the embodiment 3 and the chemical rubber plug cross-linking fluid in the embodiment 4 (the ratio is 100:1) are pushed into the microcracks in the near wellbore area, the extension of the main cracks along the longitudinal microcrack direction is controlled, the chemical rubber plug cross-linking time is controlled within 10-20 min, a gel breaker is added in the whole implementation process (the ratio of the chemical rubber plug base fluid in the embodiment 3 to the gel breaker is 100:0.4), and then the high-viscosity rubber plug in the wellbore is pushed into the ground by the water-based fracturing fluidAnd stopping the pump for 20min to form strong jelly glue on the chemical rubber plug, pumping, injecting water-based fracturing fluid to dredge the near-wellbore area, and opening a liquid inlet channel for later-stage fracturing. The fracture construction curve is shown in figure 3: the well temperature data after the fracturing shows that the temperature change well section 2740-2790m of the S1 layer of the X well has the crack upper seam height near 2755m and the crack lower seam height 2795 m. The fracture form of the main force liquid absorption well section 2765-2790m is effectively controlled, and the transformation effect is good.
Example 13
In-situ application of a certain well in exploration of an oil field in Xinjiang, a perforation section 2775-2785 m of the well, a developing vertical split crack at the lower part of a target layer and a position 25m away from the target layer explain water content, and in order to avoid communication of a lower water layer, the fracturing construction discharge capacity is 3.0-3.5 m3Min, inject pad fluid 240m3After that, an artificial crack was formed and then injected into the hole at 28m3The base liquid composition of the chemical rubber plug obtained in example 2 and the chemical rubber plug cross-linking liquid obtained in example 6 (the ratio is 100:1.2) are pushed into the microcracks in the near-wellbore region, the extension of the main cracks along the longitudinal microcrack direction is controlled, the chemical rubber plug cross-linking time is controlled within 10-20 min, and a gel breaker is added in the whole process in the implementation process (the ratio of the chemical rubber plug base liquid and the gel breaker in example 2 is 100: 0.3). Then, a high-viscosity rubber plug of a shaft is pushed into the stratum by water-based fracturing fluid, a pump is stopped for 30min to form strong jelly glue on the chemical rubber plug, the pump is started, then the water-based fracturing fluid is injected for dredging a near-wellbore area, a liquid inlet channel is opened for later-stage fracturing, main sand adding fracturing is started, the inverted crack height after fracturing is 28m, 25t of daily oil production is achieved, and water does not exist. The chemical rubber plug can control the height of a crack under the condition that a target layer contains water, so that a water layer is prevented from being communicated, and the influence of water containing after pressing on the fracturing effect is avoided.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
the thickening agent has the effect of quick thickening, but when the base liquid of the high-viscosity chemical rubber plug formed only by the thickening agent as the base liquid composition is mixed with the chemical rubber plug cross-linking liquid composition with the cross-linking effect, the cross-linking time of the formed chemical rubber plug is too fast, so that the rubber plug is gelatinized before reaching the crack, the plugging effect is reduced, and the application rate is increasedWorker rubs and hinders. However, the base liquid composition of the chemical rubber plug prolongs the crosslinking time of the high-viscosity rubber plug, improves the plugging effect, reduces the construction friction resistance and simultaneously overcomes the problem of rapid reduction of the high-temperature shearing viscosity of the chemical rubber plug due to the delayed addition of the crosslinking agent, and the dosage of the delayed crosslinking agent and the thickening agent is controlled in the range, so that the prepared base liquid composition of the chemical rubber plug has higher viscosity, and the corresponding chemical rubber plug comprising the base liquid composition has the viscosity of 170s at 100 ℃-1The temperature and shear resistant viscosity of the fracturing artificial crack is kept above 500mPa & s after the fracturing is continuously carried out for 90min, so that the aim of efficiently controlling the height and morphological development of the fracturing artificial crack is fulfilled.
The proportion of the base liquid composition of the chemical rubber plug can control the effect of the base liquid of the formed chemical rubber plug and the cross-linking liquid composition of the chemical rubber plug, thereby improving the plugging effect. And the base liquid composition of the chemical rubber plug has simple formula, the raw materials are cheap and easy to obtain, and the production cost is reduced to a certain extent.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (17)
1. A base liquid composition for a chemical rubber plug is characterized by comprising the following components in parts by weight:
0.005-0.08 part of delayed crosslinking agent;
0.5-1.2 parts of a thickening agent; and
98-99 parts of water.
2. The base fluid composition of claim 1, wherein the delayed cross-linking agent is one or more of glycerol, citric acid, sodium gluconate, and potassium gluconate.
3. The base fluid composition as claimed in claim 1, wherein the thickening agent is guar gum, preferably the guar gum is one or both of carboxymethyl guar gum and hydroxypropyl guar gum.
4. The base fluid composition as claimed in claim 1, further comprising an additive, preferably the additive is one or more of an anti-swelling agent, a demulsifier, a cleanup additive.
5. The base liquid composition as claimed in claim 4, wherein the anti-swelling agent is one or more of inorganic clay anti-swelling agent, organic clay anti-swelling agent, cationic water-soluble polymer, and polyquaternary ammonium salt anti-swelling agent, and preferably the anti-swelling agent is 0.1-6 parts by weight.
6. The base fluid composition as claimed in claim 4, wherein the demulsifier is one or more of polyoxyethylene polyoxypropylene polyether, polyoxyethylene oleate and polymeric carboxylate, and preferably the demulsifier is 0.1-1 part by weight.
7. The base solution composition as claimed in claim 4, wherein the cleanup additive is one or more of a fluorocarbon surfactant, a salt cleanup additive, and an organosilicon cleanup additive, and is preferably 0.1-1 part by weight.
8. The chemical rubber plug composition is characterized by comprising the following components in parts by weight:
100 parts of a chemical plug base fluid component, the chemical plug base fluid component being the base fluid composition of any one of claims 1 to 7;
1.0-1.5 parts of a chemical rubber plug crosslinking liquid component; and
0.001-0.4 parts of a gel breaker.
9. The chemical rubber plug composition according to claim 8, wherein the chemical rubber plug cross-linking liquid comprises, in parts by weight:
20-60 parts of a cross-linking agent;
5-30 parts of a high-temperature stabilizer;
1-8 parts of a pH regulator; and
10-42 parts of water.
10. The chemical rubber plug composition according to claim 9, wherein the crosslinking agent is one or more of an organic boron crosslinking agent, an organic zirconium crosslinking agent, and an organic aluminum crosslinking agent.
11. The chemical rubber plug composition according to claim 9, wherein the high temperature stabilizer is a mixture of zirconia and glycerol at 140 ℃, wherein the mass ratio of the zirconia to the glycerol is 1: 1.
12. The chemical plug composition according to claim 9 wherein the pH modifier is one or more of sodium carbonate, potassium carbonate, sodium hydroxide, potassium hydroxide.
13. The chemical plug composition of claim 8 wherein the breaker is one or more of a bio-enzyme, sodium persulfate, ammonium persulfate, capsule breaker.
14. A chemical rubber plug prepared from a chemical rubber plug composition, wherein the chemical rubber plug composition is the chemical rubber plug composition according to any one of claims 8 to 13.
15. The application process of the chemical rubber plug is characterized by comprising the following steps in sequence: the method comprises the following steps of pre-fluid crack initiation, chemical rubber plug plugging, water-based fracturing fluid breakthrough dredging, sand carrying fluid sand adding and displacement fluid displacement, wherein the chemical rubber plug is any one of the chemical rubber plugs in claim 14.
16. The application process of claim 15, wherein the injection displacement of the chemical rubber plug in the chemical rubber plug plugging is 0.8-2 m3/min。
17. The application process of claim 15, wherein the step of stopping the pump is included after the chemical plug is plugged and before the water-based fracturing fluid breaks through and is dredged, and the time for stopping the pump is preferably 10-30 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010067654.1A CN113136183B (en) | 2020-01-20 | 2020-01-20 | Base liquid composition of chemical rubber plug, chemical rubber plug composition, chemical rubber plug and application process of chemical rubber plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010067654.1A CN113136183B (en) | 2020-01-20 | 2020-01-20 | Base liquid composition of chemical rubber plug, chemical rubber plug composition, chemical rubber plug and application process of chemical rubber plug |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113136183A true CN113136183A (en) | 2021-07-20 |
| CN113136183B CN113136183B (en) | 2022-12-02 |
Family
ID=76809298
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010067654.1A Active CN113136183B (en) | 2020-01-20 | 2020-01-20 | Base liquid composition of chemical rubber plug, chemical rubber plug composition, chemical rubber plug and application process of chemical rubber plug |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113136183B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116103027A (en) * | 2023-03-06 | 2023-05-12 | 深圳海程油田技术服务有限公司 | Liquid bridge plug and preparation method and application thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1687299A (en) * | 2005-04-19 | 2005-10-26 | 大庆油田有限责任公司 | Water-base fracturing fluid with low harm to permeability of reservoir bed and diversion capability of crack |
| CN102206484A (en) * | 2011-04-07 | 2011-10-05 | 中国石油天然气股份有限公司 | Acidic water repellent associated matter fracturing fluid |
| CN104498018A (en) * | 2014-12-23 | 2015-04-08 | 中国石油天然气股份有限公司 | Low-concentration guar gum water-based fracturing fluid as well as preparation method and application thereof |
| WO2016110038A1 (en) * | 2015-01-07 | 2016-07-14 | 中国石油天然气集团公司 | Guanidine gum fracturing fluid system |
-
2020
- 2020-01-20 CN CN202010067654.1A patent/CN113136183B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1687299A (en) * | 2005-04-19 | 2005-10-26 | 大庆油田有限责任公司 | Water-base fracturing fluid with low harm to permeability of reservoir bed and diversion capability of crack |
| CN102206484A (en) * | 2011-04-07 | 2011-10-05 | 中国石油天然气股份有限公司 | Acidic water repellent associated matter fracturing fluid |
| CN104498018A (en) * | 2014-12-23 | 2015-04-08 | 中国石油天然气股份有限公司 | Low-concentration guar gum water-based fracturing fluid as well as preparation method and application thereof |
| WO2016110038A1 (en) * | 2015-01-07 | 2016-07-14 | 中国石油天然气集团公司 | Guanidine gum fracturing fluid system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116103027A (en) * | 2023-03-06 | 2023-05-12 | 深圳海程油田技术服务有限公司 | Liquid bridge plug and preparation method and application thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113136183B (en) | 2022-12-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2190942B1 (en) | Methods of using colloidal silica based gels | |
| AU2009305258B2 (en) | Methods for treating a subterranean formation by introducing a treatment fluid containing a proppant and a swellable particulate and subsequently degrading the swellable particulate | |
| US20140290943A1 (en) | Stabilized Fluids In Well Treatment | |
| CN102587858B (en) | Method for blocking water for fracture and hole type reservoir | |
| US20100252262A1 (en) | Low concentrations of gas bubbles to hinder proppant settling | |
| CN106085404B (en) | A kind of Low Damage, super low concentration guar gum fracturing fluid system, preparation method and application | |
| US20130000900A1 (en) | Down-hole placement of water-swellable polymers | |
| US7378377B2 (en) | Compositions for preventing coagulation of water-in-oil emulsion polymers in aqueous saline well treating fluids | |
| CN105916959A (en) | Fracturing process using liquid ammonia | |
| CN109749748B (en) | Water-rich round gravel stratum shield muck improvement method and muck improvement agent | |
| CN101679845A (en) | Oil-well cement fluid loss additive composition | |
| US2667224A (en) | Well completion process | |
| CN108505982A (en) | It is a kind of using liquid gum plug realize temporary stall to old well refracturing method for increasing | |
| US8726999B2 (en) | Thermothickener polymer and surfactant composition and methods of employing the composition | |
| CN109826590A (en) | A kind of old well water blockoff fracturing process of hypotonic oil gas field High water cut | |
| CN101955763B (en) | High pressure-resistant leak stoppage agent and leak stoppage slurry containing same | |
| CN113136183B (en) | Base liquid composition of chemical rubber plug, chemical rubber plug composition, chemical rubber plug and application process of chemical rubber plug | |
| CN103468237A (en) | Clean fracturing fluid and preparation method thereof | |
| CN106634911A (en) | Reverse-phase temporary plugging agent and preparation method thereof | |
| CN105273709A (en) | Clean crushing liquid system | |
| CN102618232B (en) | Plugging agent for fractured-vuggy oil reservoir | |
| CN108913115B (en) | Low-damage composite fracturing fluid and application method thereof | |
| CN104927005B (en) | A kind of alkaline-resisting profile control agent of pre-crosslinked gel volume expansion grain and preparation method thereof and purposes | |
| CN108251096B (en) | Residue-free fracturing fluid loss agent and fluid loss method for fractured reservoir | |
| RU2356929C1 (en) | Viscoelastic composition for insulating operations in wells |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |