CN110129013B - Organic-inorganic composite gel plugging agent and preparation method and application thereof - Google Patents
Organic-inorganic composite gel plugging agent and preparation method and application thereof Download PDFInfo
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- CN110129013B CN110129013B CN201910395930.4A CN201910395930A CN110129013B CN 110129013 B CN110129013 B CN 110129013B CN 201910395930 A CN201910395930 A CN 201910395930A CN 110129013 B CN110129013 B CN 110129013B
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Abstract
The invention relates to the field of drilling fluid leakage stoppage of high-temperature strata, and discloses an organic-inorganic composite gel leakage stoppage agent, and a preparation method and application thereof. The organic-inorganic composite gel plugging agent comprises an organic composite comonomer, an organic composite cross-linking agent, an initiator, inorganic polymeric salt, potential alkali and water. The organic-inorganic gel plugging agent has excellent gelling strength and high-temperature stability, and has an excellent plugging effect on a high-temperature fracture leakage stratum.
Description
Technical Field
The invention relates to the field of drilling fluid leakage stoppage of high-temperature strata, in particular to an organic-inorganic composite gel leakage stoppage agent and a preparation method and application thereof.
Background
The well leakage is one of the most common underground complex problems in the current drilling process, is an accident which seriously affects the construction safety of drilling engineering, and is a phenomenon that drilling fluid or other working fluids are leaked to a stratum during the drilling process. The method not only can prolong the drilling period, but also can bring unnecessary loss to construction units, and can bring great negative effects to the exploration of underground oil and gas reservoir resources after well leakage occurs. Therefore, the leakage prevention and stoppage of the drilling fluid are always the focus of attention in the petroleum engineering field at home and abroad.
Aiming at the performance and price advantages of different plugging materials, currently, inorganic non-metallic plugging materials are widely applied, wherein the inorganic non-metallic plugging materials comprise various special cements, mixed cement thick paste and the like. Cross-linked polymer gels are common lost circulation materials for treating malignant leakage. The mechanical strength of the pure polymer gel is relatively low, while the mechanical strength of the novel composite multifunctional gel is relatively high, and the problem of underground stratum leakage can be effectively solved. The super-strong water-absorbing resin is also a polymer plugging material which is applied more, and enters a leakage pore channel under the action of internal pressure difference through water absorption expansion to plug a leakage layer, so that drilling fluid is prevented from leaking into a drilling crack. However, the plugging materials currently in common use have some drawbacks: (1) the common organic leakage-proof plugging system has insufficient temperature resistance, generally not more than 140 ℃, poor high-temperature long-term stability and limited use in high-temperature wells in deep complex formations; (2) the inorganic gel material is flocculated and settled and is difficult to inject into the deep part of the leakage passage, and in addition, the inorganic gel material is lack of toughness and is difficult to form a high-pressure-bearing plugging barrier in the leakage passage.
Therefore, it is necessary to develop an organic-inorganic hybrid gel plugging agent suitable for high temperature formation, and simultaneously exert the advantages of high strength and high toughness of the organic gel and high temperature resistance of the inorganic gel, so as to realize efficient plugging of high temperature leakage channels.
Disclosure of Invention
The invention aims to solve the problems that an organic gel plugging agent in the prior art cannot resist high temperature and inorganic gel lacks toughness, and provides an organic-inorganic hybrid gel plugging agent, and a preparation method and application thereof. The gel plugging agent has excellent gelling strength and high-temperature stability, and has an excellent plugging effect on a high-temperature fracture leakage stratum.
In order to achieve the above object, the first aspect of the present invention provides an organic-inorganic composite gel plugging agent, wherein the gel plugging agent comprises an organic composite comonomer, an organic composite cross-linking agent, an initiator, an inorganic polymeric salt, a latent base and water.
Preferably, based on the total weight of the gel plugging agent, the content of the organic composite comonomer is 3-15%, the content of the organic composite crosslinking agent is 0.5-3%, the content of the initiator is 0.02-0.2%, the content of the inorganic polymeric salt is 1-5%, and the content of the latent alkali is 0.3-3%.
More preferably, based on the total weight of the gel plugging agent, the content of the organic composite comonomer is 6-10%, the content of the organic composite crosslinking agent is 1.0-2%, the content of the initiator is 0.06-0.1%, the content of the inorganic polymeric salt is 1.5-3%, and the content of the latent alkali is 0.8-1.5%.
Preferably, the organic copolymerization composite monomer is a combination of an acrylamide monomer, a sulfonic acid group-containing monomer and an organic ester monomer, and the mass ratio of the acrylamide monomer to the sulfonic acid group-containing monomer to the organic ester monomer is 1 (0.1-0.6) to 0.005-0.1.
More preferably, the mass ratio of the acrylamide monomer, the sulfonic acid group-containing monomer and the organic ester monomer is 1 (0.2-0.4) to (0.01-0.05).
Preferably, the monomer containing the sulfonic acid group is 2-acrylamide-2-methylpropanesulfonic acid and/or sodium p-styrenesulfonate.
Preferably, the organic ester monomer is at least one of vinyl acetate, tert-butyl acrylate and methyl acrylate.
Preferably, the organic complex cross-linking agent comprises N, N-methylene bisacrylamide and polyethyleneimine. In the total weight of the organic composite cross-linking agent, the mass ratio of the N, N-methylene bisacrylamide to the polyethyleneimine is 1 (0.2-0.8).
More preferably, the mass ratio of N, N-methylene bisacrylamide to polyethyleneimine is 1 (0.3-0.5).
Preferably, the initiator comprises potassium persulfate and/or ammonium persulfate.
Preferably, the inorganic polymeric salt comprises at least one of polyaluminium sulfate, polyferric chloride, polyaluminium ferric sulfate, polyaluminium ferric chloride.
Preferably, the latent base is at least one of carbamide, pyridine, aniline and ammonium carbamate.
More preferably, the latent base is carbamide and/or ammonium carbamate.
The second aspect of the invention provides a preparation method of the organic-inorganic composite gel plugging agent, which comprises the following steps:
(I) adding a monomer containing sulfonic acid groups into water, stirring until the monomer is completely dissolved, and adjusting the pH value of the solution to 7 to obtain a solution a;
(II) adding acrylamide and an organic ester monomer into the solution a, and stirring until the acrylamide and the organic ester monomer are completely dissolved to obtain a mixed solution b;
(III) adding an organic composite cross-linking agent into the mixed solution b, and stirring until the organic composite cross-linking agent is completely dissolved to obtain a mixed solution c;
(IV) adding inorganic polymeric salt and latent alkali into the mixed solution c, and stirring until the inorganic polymeric salt and the latent alkali are completely dissolved to obtain a mixed solution d;
(V) adding an initiator into the mixed solution d, and stirring until the initiator is completely dissolved to obtain a mixed solution e, namely the organic-inorganic composite gel plugging agent.
Preferably, the temperature of the agitation mixing in steps (I) - (V) is less than 50 ℃.
The third aspect of the invention provides an application of the organic-inorganic composite gel plugging agent or the organic-inorganic composite gel plugging agent prepared by the method.
Preferably, the application is drilling fluid plugging.
Preferably, the process of drilling fluid plugging comprises the following steps: injecting the organic-inorganic composite gel plugging agent into the drilling cracks, sealing and standing, and curing to form the gel.
Preferably, the standing temperature is 50-220 ℃, and the gel forming time is 0.5-5 h.
More preferably, the temperature of the sealed standing is 100-180 ℃; curing and gelling time is 2-3 h.
The invention provides an organic-inorganic composite gel plugging agent and a preparation method thereof, and the obtained beneficial effects are mainly reflected as follows:
(1) in the gel plugging agent provided by the invention, organic composite comonomer initiates polymerization and crosslinking to form viscoelastic organogel under the action of initiator and crosslinking agent, and potential alkali is ionized in aqueous solution to generate OH-Reacting with metal ions in the polymeric inorganic salt to generate inorganic gel with certain strength, finally forming organic-inorganic composite hybrid gel, and adjusting the proportion of each component to ensure that the gel generated after curing has higher gelling strength and high-temperature stability.
(2) The potential alkali carbamide and/or ammonium carbamate in the gel plugging agent provided by the invention starts to decompose under the condition of high temperature (160 ℃) to generate ammonia gas, and the ammonia gas is dissolved in water and ionized to generate OH-The organic gel reacts with metal ions in the polymeric inorganic salt to generate inorganic gel with certain strength, and the gel strength reduction caused by high-temperature failure of the organic gel under the high-temperature condition can be compensated.
(3) The organogel component in the gel plugging agent provided by the invention has water-absorbing expansion performance after being gelatinized, and the inorganic gel component has filling and toughening effects on organogel after being gelatinized, so that an organic-inorganic hybrid gel network structure is formed, and the defects of low strength, temperature difference resistance and no elasticity of single inorganic gel of single organogel are overcome.
(4) Compared with the effect of directly using N, N-methylene bisacrylamide in the prior art, the gel plugging agent provided by the invention is an organic composite cross-linking agent, and the gel generated after curing and gelling has higher strength, stronger toughness, better temperature resistance and better plugging effect on leakage channels.
(5) The preparation method of the gel plugging agent provided by the invention is simple and easy to operate, and can realize on-site injection allocation.
Drawings
FIG. 1 is the initial apparent viscosity of gel plugging agent solution A1-D5;
FIG. 2 is the initial modulus of elasticity of gel plugging agent solution A1-D5;
FIG. 3 is the apparent viscosity of gel plugging agent solution A1-D5 after high temperature aging;
FIG. 4 is the modulus of elasticity of gel plugging agent solutions A1-D5 after high temperature aging.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
The invention provides an organic-inorganic composite gel plugging agent in a first aspect, which comprises an organic composite comonomer, an organic composite cross-linking agent, an initiator, inorganic polymeric salt, latent alkali and water.
In the invention, organic composite comonomer initiates polymerization and crosslinking to form viscoelastic organogel under the action of initiator and crosslinking agent, OH-generated by potential alkali ionization in aqueous solution reacts with metal ions in polymeric inorganic salt to generate inorganic gel with certain strength, and finally organic-inorganic composite hybrid gel is formed. The organogel component in the gel plugging agent provided by the invention has water-absorbing expansion performance after being gelatinized, and the inorganic gel component has filling and toughening effects on organogel after being gelatinized, so that an organic-inorganic hybrid gel network structure is formed, and the defects of low strength, temperature difference resistance and no elasticity of single inorganic gel of single organogel are overcome.
In order to obtain a gel with higher gel strength and temperature resistance, the inventor researches the dosage of each component in the plugging agent. Researches show that when the content of the organic composite comonomer is 3-15%, the content of the organic composite cross-linking agent is 0.5-3%, the content of the initiator is 0.02-0.2%, the content of the inorganic polymeric salt is 1-5%, and the content of the latent alkali is 0.3-3% based on the total weight of the gel plugging agent, the gel generated after curing has higher gel forming strength and high temperature stability.
In the organic-inorganic composite gel plugging agent provided by the invention, the total content of the organic composite comonomer, the organic composite cross-linking agent, the initiator, the inorganic polymer, the potential alkali and the water is 100%.
According to the invention, more preferably, based on the total weight of the gel plugging agent, the content of the organic composite comonomer is 6-10%, the content of the organic composite crosslinking agent is 1-2%, the content of the initiator is 0.06-0.1%, the content of the inorganic polymeric salt is 1.5-3%, and the content of the latent alkali is 0.8-1.5%.
In the invention, the inventor researches and discovers that when the dosage of the organic composite comonomer, the organic composite cross-linking agent, the initiator, the inorganic polymeric salt and the latent alkali in the gel plugging agent meets the range, the prepared gel plugging agent has excellent gel forming strength and high-temperature stability, and has an excellent plugging effect on a high-temperature crack leakage stratum.
Specifically, the content of the organic complex comonomer may be, for example, 7%, 8%, 9% or any two of these values, and the content of the organic complex crosslinking agent may be, for example, 1.5% based on the total weight of the gel plugging agent; the initiator content may preferably be, for example, 0.07%, 0.08%, 0.09%, and any value within the range of any two of these values; the inorganic polymeric salt may be present in an amount effective, for example, to any value in the range of 2%, 2.5%, and any two of these values; the latent base may be present, for example, at 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, and any value in the range defined by any two of these values.
According to the invention, the organic copolymerization composite monomer is a combination of an acrylamide monomer, a sulfonic acid group-containing monomer and an organic ester monomer, and the mass ratio of the acrylamide monomer to the sulfonic acid group-containing monomer to the organic ester monomer is 1 (0.1-0.6) to (0.005-0.1) based on the total weight of the organic copolymerization composite monomer.
Preferably, the mass ratio of the acrylamide monomer, the sulfonic acid group-containing monomer and the organic ester monomer is 1 (0.2-0.4) to (0.01-0.05).
Preferably, the monomer containing the sulfonic acid group is 2-acrylamide-2-methylpropanesulfonic acid and/or sodium p-styrenesulfonate.
Preferably, the organic ester monomer is at least one of vinyl acetate, tert-butyl acrylate and methyl acrylate.
According to the invention, the organic composite cross-linking agent is a combination of N, N-methylene-bisacrylamide and polyethyleneimine; in the organic composite cross-linking agent, the mass ratio of N, N-methylene bisacrylamide to polyethyleneimine is 1 (0.2-0.8).
According to the invention, the traditional N, N-methylene bisacrylamide is replaced by the organic composite cross-linking agent of N, N-methylene bisacrylamide and polyethyleneimine, and compared with the effect of directly using the traditional N, N-methylene bisacrylamide, the gel generated after curing and gelling is higher in strength, stronger in toughness and better in temperature resistance, and has a better plugging effect on a leakage channel.
Preferably, the mass ratio of the N, N-methylene-bisacrylamide to the polyethyleneimine is 1 (0.3-0.5).
According to the invention, the initiator comprises potassium persulfate and/or ammonium persulfate.
According to the invention, the inorganic polymeric salt comprises at least one of polymeric aluminum sulfate, polymeric ferric chloride, polymeric aluminum ferric sulfate, and polymeric aluminum ferric chloride.
According to the invention, the latent base is at least one of carbamide, pyridine, aniline, ammonium carbamate.
According to the invention, the latent base is carbamide and/or ammonium carbamate.
OH generated by ionization of potential alkali pyridine and aniline in water solution-The organic gel reacts with metal ions in the polymeric inorganic salt to generate inorganic gel with certain strength, and the gel strength reduction caused by high-temperature failure of the organic gel can be compensated.
The potential alkali carbamide and the ammonium carbamate start to decompose under the condition of high temperature (160 ℃) to generate ammonia gas, and the ammonia gas is dissolved in water and ionized to generate OH-The polymer gel reacts with metal ions in the polymer inorganic salt to generate inorganic gel with certain strength, so that the gel strength reduction caused by high-temperature failure of the organic gel under the high-temperature condition can be compensated.
The second aspect of the invention provides a method for preparing an organic-inorganic composite gel plugging agent, which comprises the following steps:
(I) adding a monomer containing a sulfonic acid group into water, stirring until the monomer is completely dissolved, and adjusting the pH value of the solution to 7 to obtain a solution a;
(II) adding acrylamide and an organic ester monomer into the solution a, and stirring until the acrylamide and the organic ester monomer are completely dissolved to obtain a mixed solution b;
(III) adding an organic composite cross-linking agent into the mixed solution b, and stirring until the organic composite cross-linking agent is completely dissolved to obtain a mixed solution c;
(IV) adding inorganic polymeric salt and latent alkali into the mixed solution c, and stirring until the inorganic polymeric salt and the latent alkali are completely dissolved to obtain a mixed solution d;
and (V) adding an initiator into the mixed solution d, and stirring until the initiator is completely dissolved to obtain a mixed solution e, thereby obtaining the organic-inorganic composite gel plugging agent.
In the invention, when the gel plugging agent is prepared, the adding sequence of the materials can be adjusted according to actual requirements. Preferably, by adopting the feeding sequence, the inventor researches and discovers that the gel plugging agent prepared by adopting the feeding sequence has excellent gelling strength and high-temperature stability and has excellent plugging effect on a high-temperature fracture leakage stratum.
According to the present invention, the temperature of the agitation mixing in steps (I) to (V) is less than 50 ℃.
The third aspect of the invention provides an application of the organic-inorganic composite gel plugging agent or the organic-inorganic composite gel plugging agent prepared by the method.
According to the invention, the application is the plugging of drilling fluids.
According to the invention, the process of drilling fluid plugging comprises the following steps: injecting the organic-inorganic composite gel plugging agent into the drilling cracks, sealing and standing, and curing to form the gel.
According to the invention, the standing temperature is 50-220 ℃, and the curing and gelling time is 0.5-5 h.
Preferably, the temperature of the sealing and standing is 100-180 ℃; curing and gelling time is 2-3 h.
The present invention will be described in detail below by way of examples.
Initial apparent viscosity and initial elastic modulus of the gel plugging agent: and testing the initial apparent viscosity and the initial elastic modulus of the gelled gel plugging agent by using a HAAKE (HAAKE) RS600 type rotational rheometer to test the components and the concentrations of different components. Wherein, the larger the initial apparent viscosity and the initial elastic modulus are, the better the initial strength and viscoelasticity of the gel plugging agent are. Specifically, the shear rate at which the apparent viscosity was measured was 7.34s-1(ii) a The elastic modulus was measured at a fixed scanning frequency of 1Hz (the same applies below).
High-temperature stability of the gel plugging agent: and (3) testing the apparent viscosity and viscoelasticity of the gel plugging agent after standing for 3d at the high temperature of 200 ℃ by using a Haake (HAAKE) RS600 type rotary rheometer. Wherein, when the reduction amplitude of the apparent viscosity and the viscoelasticity is larger, the higher the high-temperature stability of the gel plugging agent is shown to be.
The high-temperature plugging effect of the gel plugging agent is as follows: the plugging effect of the gel plugging agent on the porous medium is tested by adopting an LHKYDL-3 type high-temperature high-pressure plugging testing device, and the leakage channel is simulated by using 20-40-mesh quartz sand as an evaluation sand bed. The specific test method comprises the following steps: pouring 500mL of gel plugging agent solution (added with initiator) into a water loss cylinder of a plugging device; placing a movable piston at the upper part of the cylinder, and screwing a cylinder cover for sealing; after the crack model is solidified at high temperature (200 ℃), a large-displacement advection pump is used for injecting water for pressurization, the pressurization speed is controlled, 1MPa is increased every 10min, the pressure is increased to 7MPa, and the leakage quantity of the outlet of the crack model is observed and recorded.
Polyethyleneimine, marketed under the designation E107077, from the alatin reagent net;
the grade of the polymeric aluminum ferric sulfate is FA2320 which is purchased from American water purification materials Co., Ltd of strengthening city;
the grade of the polyaluminum ferric chloride is PA1100, which is purchased from American water purification materials Co., Ltd of strengthening city;
other raw materials used in the examples and the comparative examples are all commercial products.
Example 1
The gel plugging agent comprises the following components: the content of the organic composite comonomer is 10 percent, the content of the organic composite cross-linking agent is 1.5 percent, the content of the initiator potassium persulfate is 0.08 percent, the content of the inorganic polymeric salt is 2 percent, the content of the potential alkali carbamide is 1 percent, and the balance is water.
Wherein the organic copolymerization composite monomer is acrylamide, 2-acrylamide-2-methylpropanesulfonic acid and tert-butyl acrylate. Based on the total weight of the organic copolymerization composite monomer, the mass ratio of the acrylamide to the 2-acrylamide-2-methylpropanesulfonic acid to the tert-butyl acrylate is 1:0.4: 0.04.
Wherein the mass ratio of the N, N-methylene bisacrylamide to the polyethyleneimine is 1:0.4 based on the total weight of the organic composite crosslinking agent.
Wherein the inorganic polymeric salt is a mixture of polymeric aluminum ferric sulfate and polymeric aluminum ferric chloride. The mass ratio of the polymeric aluminum ferric sulfate to the polymeric aluminum ferric chloride is 1:1 based on the total weight of the inorganic polymeric salt.
The gel plugging agent A1 is prepared according to the preparation method of the organic-inorganic composite gel plugging agent provided by the invention.
The results of the initial apparent viscosity and initial elastic modulus tests of gel plugging agent solution a1 after gelling are shown in fig. 1 and 2. The high-temperature plugging effect of the gel plugging agent solution A1 after gelling is shown in Table 1.
Example 2
A gel plugging agent was prepared in the same manner as in example 1, except that: the gel plugging agent comprises the following components: the content of the organic composite comonomer is 12 percent, the content of the organic composite cross-linking agent is 0.5 percent, the content of the initiator is 0.03 percent, the content of the inorganic polymeric salt is 5 percent, the content of the ammonium carbamate is 3 percent, and the balance is water. Obtaining the gel plugging agent A2.
The results of the initial apparent viscosity and initial elastic modulus tests of gel plugging agent solution a2 after gelling are shown in fig. 1 and 2. The high-temperature plugging effect of the gel plugging agent solution A2 after gelling is shown in Table 1.
Example 3
A gel plugging agent was prepared in the same manner as in example 1, except that: the mass ratio of the acrylamide to the monomer containing the sulfonic acid group to the organic ester monomer is as follows: 1:0.6:0.1. Obtaining the gel plugging agent A3.
The results of the initial apparent viscosity and initial elastic modulus tests of gel plugging agent solution a3 after gelling are shown in fig. 1 and 2. The high-temperature plugging effect of the gel plugging agent solution A3 after gelling is shown in Table 1.
Example 4
A gel plugging agent was prepared in the same manner as in example 1, except that: the mass ratio of the N, N-methylene bisacrylamide to the polyethyleneimine is 1: 0.8. Obtaining the gel plugging agent A4.
The results of the initial apparent viscosity and initial elastic modulus tests of gel plugging agent solution a4 after gelling are shown in fig. 1 and 2. The high-temperature plugging effect of the gel plugging agent solution A4 after gelling is shown in Table 1.
Example 5
A gel plugging agent was prepared in the same manner as in example 1, except that: the monomer containing sulfonic acid groups is 2-acrylamide-2-methylpropanesulfonic acid and sodium p-styrenesulfonate, and the mass ratio of the two is 1: 1. Obtaining the gel plugging agent A5.
The results of the initial apparent viscosity and initial elastic modulus tests of gel plugging agent solution a5 after gelling are shown in fig. 1 and 2. The high-temperature plugging effect of the gel plugging agent solution A5 after gelling is shown in Table 1.
Example 6
A gel plugging agent was prepared in the same manner as in example 1, except that: the organic ester monomer is vinyl acetate, tert-butyl acrylate and methyl acrylate, and the mass ratio of the vinyl acetate to the tert-butyl acrylate to the methyl acrylate is 1:1: 1. Obtaining the gel plugging agent A6.
The results of the initial apparent viscosity and initial elastic modulus tests of gel plugging agent solution a6 after gelling are shown in fig. 1 and 2. The high-temperature plugging effect of the gel plugging agent solution A6 after gelling is shown in Table 1.
Example 7
A gel plugging agent was prepared in the same manner as in example 1, except that: the content of the organic composite comonomer is 20 percent, the content of the organic composite cross-linking agent is 4 percent, the content of the initiator potassium persulfate is 0.25 percent, the content of the inorganic polymeric salt is 6 percent, the content of the potential alkali carbamide is 4 percent, and the balance is water. The gel plugging agent A7 is prepared.
The results of the initial apparent viscosity and initial elastic modulus tests of gel plugging agent solution a7 after gelling are shown in fig. 1 and 2. The high-temperature plugging effect of the gel plugging agent solution A7 after gelling is shown in Table 1.
Comparative example 1
A gel plugging agent was prepared in the same manner as in example 1, except that: and the inorganic polymeric salt and the latent base are not contained. The gel plugging agent D1 is prepared.
The results of the initial apparent viscosity and initial elastic modulus tests of gel plugging agent solution D1 after gelling are shown in fig. 1 and 2. The high-temperature plugging effect of the gel plugging agent solution D1 after gelling is shown in Table 1.
Comparative example 2
A gel plugging agent was prepared in the same manner as in example 1, except that: does not contain organic composite comonomer, organic composite cross-linking agent and initiator. The gel plugging agent D2 is prepared.
The results of the initial apparent viscosity and initial elastic modulus tests of gel plugging agent solution D2 after gelling are shown in fig. 1 and 2. The high-temperature plugging effect of the gel plugging agent solution D2 after gelling is shown in Table 1.
Comparative example 3
A gel plugging agent was prepared in the same manner as in example 1, except that: equivalent amount of acrylamide monomer is used to replace the sulfonic acid group monomer and the organic ester monomer. The gel plugging agent D3 is prepared.
The results of the initial apparent viscosity and initial elastic modulus tests of gel plugging agent solution D3 after gelling are shown in fig. 1 and 2. The high-temperature plugging effect of the gel plugging agent solution D3 after gelling is shown in Table 1.
Comparative example 4
A gel plugging agent was prepared in the same manner as in example 1, except that: the polyethyleneimine is replaced by an equivalent amount of N, N-methylenebisacrylamide. The gel plugging agent D4 is prepared.
The results of the initial apparent viscosity and initial elastic modulus tests of gel plugging agent solution D4 after gelling are shown in fig. 1 and 2. The high-temperature plugging effect of the gel plugging agent solution D4 after gelling is shown in Table 1.
Comparative example 5
A gel plugging agent was prepared in the same manner as in example 1, except that: the polyaluminum ferric sulfate was replaced with an equal amount of polyaluminum ferric chloride. The gel plugging agent D5 is prepared.
The results of the initial apparent viscosity and initial elastic modulus tests of gel plugging agent solution D5 after gelling are shown in fig. 1 and 2. The high-temperature plugging effect of the gel plugging agent solution D5 after gelling is shown in Table 1.
Comparative example 6
A gel plugging agent was prepared in the same manner as in example 1, except that: contains no latent base. The gel plugging agent D6 is prepared.
The results of the initial apparent viscosity and initial elastic modulus tests of gel plugging agent solution D6 after gelling are shown in fig. 1 and 2. The high-temperature plugging effect of the gel plugging agent solution D6 after gelling is shown in Table 1.
TABLE 1 plugging test Effect of gel plugging agent A1-D7 on cracks
As can be seen from the data in Table 1, the gel plugging agent A1-A6 has good plugging effect on high-permeability porous media after being gelled. Specifically, when the gel plugging agent is used independently, the pressure bearing capacity of the gel plugging agents A1, A2 and A5 is higher than 7MPa, and the plugging requirement of the drilling fluid under the conditions of 200 ℃ high temperature and high pressure bearing of a crack can be met.
Although the gel plugging agent A7 leaks at 6MPa and linearly leaks at 7MPa, the plugging performance of the gel plugging agent A7 is still remarkably higher than that of the gel plugging agents D1-D6, which shows that the gel plugging agent A7 can meet the actual requirements to a certain extent.
The gel plugging agent D2 has the leakage when the pressure is 1MPa, and has the total leakage when the pressure is 3MPa, so the plugging effect is the worst. The gel plugging agent D6 has the leakage at 4MPa and the total leakage at 6MPa, which shows that the high-temperature plugging effect is poor. The gel plugging agents D3, D4 and D5 all generate dripping leakage at 5MPa, which shows that the high-temperature plugging effect is inferior to that of the gel plugging agents A1 and A2.
As can be seen from fig. 1 and 2, the initial apparent viscosity and initial viscoelasticity of the gel plugging agent a1 after curing into gel are highest, indicating that when the concentrations of the components of the gel plugging agent are within the ranges defined in the present invention, the gel after gel formation has excellent strength and viscoelasticity. The gel plugging agent A2 has lower initial apparent viscosity and initial viscoelasticity than the gel plugging agent A1 but higher than the gel plugging agents D1-D6 after being cured into gel, which shows that when the components and the concentration of the gel plugging agent are in the preferable range recommended by the patent of the invention, the gel has better strength and viscoelasticity after being cured into gel. The gel plugging agent D1-D6 is obviously lower in initial apparent viscosity and initial viscoelasticity after being cured into gel than the gel plugging agents A1 and A2, and the gel strength and viscoelasticity are poor.
As can be seen from FIGS. 3 and 4, the gel plugging agent A1 has a small decrease in apparent viscosity and elastic modulus after high-temperature aging, and has the best high-temperature stability. The high-temperature stability of the gel plugging agent A2 is lower than that of the gel plugging agent A1, but better than that of the gel plugging agents D1-D6.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (17)
1. An organic-inorganic composite gel plugging agent, wherein the gel plugging agent comprises an organic composite comonomer, an organic composite cross-linking agent, an initiator, inorganic polymeric salt, latent alkali and water;
the organic composite comonomer is a combination of an acrylamide monomer, a sulfonic acid group-containing monomer and an organic ester monomer;
the organic composite cross-linking agent comprises N, N-methylene bisacrylamide and polyethyleneimine;
the inorganic polymeric salt is a mixture of polymeric aluminum ferric sulfate and polymeric aluminum ferric chloride;
based on the total weight of the gel plugging agent, the content of the organic composite comonomer is 3-15%, the content of the organic composite crosslinking agent is 0.5-3%, the content of the initiator is 0.02-0.2%, the content of the inorganic polymeric salt is 1-5%, and the content of the latent alkali is 0.3-3%.
2. The gel plugging agent according to claim 1, wherein based on the total weight of the gel plugging agent, the content of the organic composite comonomer is 6-10%, the content of the organic composite crosslinking agent is 1.0-2%, the content of the initiator is 0.06-0.1%, the content of the inorganic polymeric salt is 1.5-3%, and the content of the latent alkali is 0.8-1.5%.
3. The gel plugging agent according to claim 1 or 2, wherein the mass ratio of the acrylamide monomer, the sulfonic acid group-containing monomer and the organic ester monomer is 1 (0.1-0.6) to (0.005-0.1).
4. The gel plugging agent according to claim 3, wherein the mass ratio of the acrylamide, the sulfonic acid group-containing monomer and the organic ester monomer is 1 (0.2-0.4) to (0.01-0.05).
5. The gel plugging agent according to claim 1 or 2, wherein the monomer containing a sulfonic acid group is 2-acrylamide-2-methylpropanesulfonic acid and/or sodium p-styrenesulfonate.
6. The gel plugging agent according to claim 1 or 2, wherein the organic ester monomer is at least one of vinyl acetate, t-butyl acrylate and methyl acrylate.
7. The gel plugging agent as claimed in claim 1 or 2, wherein the mass ratio of N, N-methylene bisacrylamide to polyethyleneimine in the organic composite cross-linking agent is 1 (0.2-0.8).
8. The gel plugging agent as claimed in claim 7, wherein the mass ratio of N, N-methylene bisacrylamide to polyethyleneimine in the organic composite cross-linking agent is 1 (0.3-0.5).
9. The gel lost circulation agent of claim 1 or 2, wherein the initiator comprises potassium persulfate and/or ammonium persulfate;
the latent base is at least one of carbamide, pyridine, aniline and ammonium carbamate.
10. The gel plugging agent of claim 9, wherein the latent base is carbamide and/or ammonium carbamate.
11. A method for preparing the organic-inorganic composite gel plugging agent according to any one of claims 1 to 10, comprising the steps of:
(I) adding a monomer containing sulfonic acid groups into water, stirring until the monomer is completely dissolved, and adjusting the pH value of the solution to 7 to obtain a solution a;
(II) adding acrylamide and an organic ester monomer into the solution a, and stirring until the acrylamide and the organic ester monomer are completely dissolved to obtain a mixed solution b;
(III) adding an organic composite cross-linking agent into the mixed solution b, and stirring until the organic composite cross-linking agent is completely dissolved to obtain a mixed solution c;
(IV) adding inorganic polymeric salt and latent alkali into the mixed solution c, and stirring until the inorganic polymeric salt and the latent alkali are completely dissolved to obtain a mixed solution d;
(V) adding an initiator into the mixed solution d, and stirring until the initiator is completely dissolved to obtain a mixed solution e, namely the organic-inorganic composite gel plugging agent.
12. The process of claim 11, wherein the temperature of the agitated mixing in steps (I) - (V) is less than 50 ℃.
13. Use of the organic-inorganic composite gel plugging agent of claims 1-10 or the organic-inorganic composite gel plugging agent prepared by the method of claims 11 or 12.
14. The use of claim 13, wherein the use is for drilling fluid plugging.
15. The use of claim 14, wherein the process of drilling fluid plugging comprises the steps of: injecting the organic-inorganic composite gel plugging agent into the drilling cracks, sealing and standing, and curing to form the gel.
16. The use of claim 15, wherein the temperature at which the seal rests is 50-220 ℃; the curing and gelling time is 0.5-5 h.
17. The use as claimed in claim 16, wherein the temperature of the sealing rest is 100-180 ℃; curing and gelling time is 2-3 h.
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| CN112442343B (en) * | 2019-08-29 | 2023-01-10 | 中国石油化工股份有限公司 | Composite gel plugging agent and preparation method thereof |
| CN111019619A (en) * | 2019-11-26 | 2020-04-17 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Liquid rubber plug temporary plugging slug for shaft isolation and preparation method |
| CN111073198B (en) * | 2019-12-26 | 2021-04-16 | 中国石油大学(北京) | Copolymerization nanocomposite and preparation method and application thereof |
| CN113388378B (en) * | 2020-03-13 | 2023-01-31 | 中石化南京化工研究院有限公司 | Novel slow expansion plugging material and preparation method thereof |
| CN115160490B (en) * | 2021-04-02 | 2023-11-28 | 中国石油天然气集团有限公司 | Preparation method of polymer gel plugging agent degraded by acid |
| CN114426619B (en) * | 2021-12-22 | 2022-11-18 | 中国石油大学(北京) | Oil-based plugging gel polymer of double-crosslinked network system and preparation method and application thereof |
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