CN111574976A - Enhanced leaking stoppage gel and preparation method thereof - Google Patents

Enhanced leaking stoppage gel and preparation method thereof Download PDF

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CN111574976A
CN111574976A CN202010598015.8A CN202010598015A CN111574976A CN 111574976 A CN111574976 A CN 111574976A CN 202010598015 A CN202010598015 A CN 202010598015A CN 111574976 A CN111574976 A CN 111574976A
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gel
enhanced
reinforcing agent
plugging
polymer
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张洪旭
张超
韦青青
汤卫华
郭振斌
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Sichuan Gredis Petroleum Technology Co ltd
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Sichuan Gredis Petroleum Technology Co ltd
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    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/42Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
    • C09K8/46Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
    • C09K8/467Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes

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Abstract

The invention discloses an enhanced leaking stoppage gel and a preparation method thereof, wherein the enhanced leaking stoppage gel comprises, by weight, 0.5-2% of polyacrylamide polymer, 2-5% of nano reinforcing agent, 1-3% of fiber reinforcing agent, 0.1-5% of cross-linking agent and 0.1-0.5% of antioxidant; the balance being water. The preparation method comprises the following steps: firstly, dissolving an antioxidant in water; then sequentially dispersing the polyacrylamide polymer, the nano reinforcing agent, the fiber reinforcing agent and the cross-linking agent in water, and uniformly mixing to obtain enhanced plugging gel base fluid; and carrying out crosslinking reaction on the base solution of the enhanced plugging gel for 2-12h to obtain the enhanced plugging gel. According to the invention, the inorganic nano-particle and fiber composite admixture is introduced into a cross-linked polymer network system, and the polymer gel has the characteristics of high gel strength, high shear toughness and the like under a high-temperature condition by virtue of the hydrogen bond effect formed by the admixture and a gel network, so that the plugging and pressure-bearing capacity of the plugging gel is improved.

Description

Enhanced leaking stoppage gel and preparation method thereof
Technical Field
The invention relates to the technical field of oil and gas exploitation, in particular to an enhanced type leaking stoppage gel and a preparation method thereof.
Background
Lost circulation is one of the most serious problems in drilling operations. When high density mud is used to overcome formation pressure, drilling fluid is lost in natural or induced fractures. Frequent lost circulation can extend the drilling unproductive time, with an average cost of about 15% for high temperature and high pressure wells. Due to the ultrahigh pressure, the existence of cracks, the drilling of depleted reservoirs and other abnormal conditions, the mud density window between the pore pressure and the fracturing gradient is reduced, and the stratum is easily damaged by high-density mud.
In the plugging operation, a pumping device is usually used for pumping the plugging material to a leaking layer, and after the plugging material is effectively plugged in the leaking layer, the subsequent drilling work is carried out. In recent years, Polyacrylamide (PAM) materials with different molecular weights and degrees of hydrolysis have been used extensively in wellbore strengthening technology. When the polyacrylamide is matched with a cross-linking agent for use, controllable cross-linking can be realized at different temperatures to form gel. At present, various cross-linked polymer-based plugging materials and processes are developed by various research and development mechanisms at home and abroad, but no breakthrough progress is made on crack and karst cave leakage. One of the more difficult work is that the jelly strength is lower after gelling, and effective plugging is difficult to achieve under the action of fluctuating pressure in the drilling process.
Disclosure of Invention
Aiming at the problems, the invention aims to provide an enhanced type leaking stoppage gel and a preparation method thereof, wherein the gel has the characteristics of high gel forming strength, high shear toughness and the like under the high-temperature condition by introducing inorganic nano particles and fiber composite dopants into a cross-linked polymer network system and by means of the hydrogen bond effect formed by the nano particles and fiber composite dopants and a gel network, so that the plugging and pressure bearing capacity of the leaking stoppage gel is improved.
The technical scheme of the invention is as follows:
on one hand, the reinforced leaking stoppage gel comprises, by weight, 0.5-2% of polyacrylamide polymer, 2-5% of nano reinforcing agent, 1-3% of fiber reinforcing agent, 0.1-5% of cross-linking agent and 0.1-0.5% of antioxidant; the balance being water.
Preferably, the polyacrylamide polymer is an acrylamide polymer with a molecular weight of 1000000-5000000Daltons and a hydrolysis degree of 2-25%.
Preferably, the polyacrylamide polymer is one or more of polyacrylamide, acrylamide and acrylic acid copolymer, acrylamide and 2-acrylamido-2-methylpropanesulfonic acid copolymer, and acrylamide and tert-butyl acrylate.
Preferably, the nano reinforcing agent is inorganic nano particles, and the particle size of the inorganic nano particles is 20-80 nm.
Preferably, the inorganic nanoparticles are one or more of silicon dioxide, titanium dioxide, zinc oxide and manganese dioxide particles.
Preferably, the fiber reinforcing agent is plant fiber powder. Preferably, the plant fiber powder has the mesh number of 40-80 meshes.
Preferably, the fiber reinforcing agent is one or more of walnut shell powder, coconut shell powder and jujube kernel powder.
Preferably, the crosslinking agent is a phenolic resin water-soluble condensation polymer.
Preferably, the antioxidant is sodium bisulfite or thiourea.
On the other hand, the preparation method of the enhanced plugging gel is also provided, and comprises the following steps: firstly, dissolving an antioxidant in water; then sequentially dispersing the polyacrylamide polymer, the nano reinforcing agent, the fiber reinforcing agent and the cross-linking agent in water, and uniformly mixing to obtain enhanced plugging gel base fluid; and carrying out crosslinking reaction on the base solution of the enhanced plugging gel for 2-12h to obtain the enhanced plugging gel.
When the anti-oxidant plugging gel is used, firstly, the anti-oxidant is fully dissolved in water, then the polyacrylamide copolymer, the nano reinforcing agent, the fiber reinforcing agent and the cross-linking agent are sequentially and uniformly dispersed in the water, the enhanced plugging gel material base liquid is obtained after uniform mixing, then the base liquid is pumped into a leaking stratum to block off the well and form enhanced plugging gel after the cross-linking reaction is finished, and plugging or production is recovered after effective plugging is realized.
Compared with the prior art, the invention has the following advantages:
the gel material adopted by the invention is a polyacrylamide polymer, which has excellent permeability for fractured strata, and the controllable time crosslinking effect at a certain temperature can be realized through the action of a crosslinking agent to form jelly; by adopting the nano reinforcing agent and the fiber reinforcing agent, on the premise of not influencing the crosslinking time, the strength and the shear toughness of the jelly are remarkably improved by utilizing the hydrogen bond effect formed by the nano particle and fiber composite admixture and the gel network, so that the effective plugging of the leakage stratum with crack property, karst cave property and the like is realized, and the one-time plugging success rate and the bearing capacity are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of the high-temperature high-pressure thickening test result of the enhanced plugging gel base fluid of the present invention.
Detailed Description
The invention is further illustrated with reference to the following figures and examples. It should be noted that, in the present application, the embodiments and the technical features of the embodiments may be combined with each other without conflict. Unless defined otherwise, technical or scientific terms used in the present disclosure should have the ordinary meaning as understood by those of ordinary skill in the art to which the present disclosure belongs. The use of the terms "comprising" or "including" and the like in the disclosure of the present invention means that the element or item appearing before the term covers the element or item listed after the term and its equivalents, without excluding other elements or items.
Example 1
Dissolving 0.1 wt% of thiourea in clear water, then fully mixing 0.8 wt% of acrylamide and tert-butyl acrylate (PAtBA) with the molecular weight of 150 ten thousand and the hydrolysis degree of 10 wt%, 2 wt% of 50nm silicon dioxide powder, 1.2 wt% of 40-80 mesh walnut shell powder and 3 wt% of water-soluble phenolic resin cross-linking agent, dispersing into the clear water, continuously stirring for 0.5-1h to fully dissolve the mixture at the circulating temperature of 20-60 ℃ to obtain enhanced plugging gel base liquid, and crosslinking for 2-12h to obtain the enhanced plugging gel material.
Example 2
0.2 wt% sodium bisulfite was dissolved in clear water. Then, 1.5 wt% of acrylamide with the molecular weight of 100 ten thousand and the hydrolysis degree of 15 wt% is fully mixed with acrylic acid, 3 wt% of 40nm titanium dioxide powder, 3 wt% of 40-80 mesh coconut shell powder and 2.5 wt% of water-soluble phenolic resin cross-linking agent, then the mixture is dispersed into clear water, the mixture is continuously stirred for 0.5-1h to be fully dissolved at the circulating temperature of 90 ℃ to obtain enhanced plugging gel base liquid, and the enhanced plugging gel base liquid is cross-linked for 2-12h to obtain the enhanced plugging gel material.
Example 3
The enhanced plugging gel base fluid prepared in the example 1 is subjected to a high-temperature high-pressure thickening test at 90 ℃ and 40MPa, the crosslinking time is 200min, and the test result is shown in figure 1. As can be seen from FIG. 1, under the dual actions of the existing cross-linking agent and the composite reinforcing agent, on one hand, the controllability of the cross-linking time of the gel is considered; on the other hand, the strength of the gel is effectively improved by reflecting the 'nearly right-angle' property of the consistency change curve.
Example 4
The gel strength of the reinforced gel lost circulation material of example 1 and example 2 was measured by the visual code method (Sydansk1990) gel strength standard at a constant temperature of 90 ℃ and without adding the nano-reinforcing agent and the fiber reinforcing agent, and the test results are shown in Table 1:
TABLE 1 jelly Strength test results
Figure BDA0002557718330000031
Figure BDA0002557718330000041
The gel finally formed in the blank case is typical 'tongue spitting gel', and as can be seen from table 1, the gel strength of the blank case after 6 hours of crosslinking reaches 'E' level, while the gel added with the nano reinforcing agent and the fiber reinforcing agent is strong gel, the gel strength can reach 'I' level, and is much higher than that of single crosslinked polymer gel, so that the gel strength has remarkable progress.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. The reinforced leakage stoppage gel is characterized by comprising, by weight, 0.5-2% of a polyacrylamide polymer, 2-5% of a nano reinforcing agent, 1-3% of a fiber reinforcing agent, 0.1-5% of a cross-linking agent and 0.1-0.5% of an antioxidant; the balance being water.
2. The reinforced plugging gel as claimed in claim 1, wherein the polyacrylamide polymer is acrylamide polymer with molecular weight of 1000000-5000000Daltons and degree of hydrolysis of 2-25%.
3. The enhanced lost circulation gel according to claim 1, wherein the polyacrylamide-based polymer is one or more of polyacrylamide, a copolymer of acrylamide and acrylic acid, a copolymer of acrylamide and 2-acrylamido-2-methylpropanesulfonic acid, and acrylamide and tert-butyl acrylate.
4. The enhanced lost circulation gel as defined in claim 1, wherein the nano reinforcing agent is inorganic nano particles, and the particle size of the inorganic nano particles is 20-80 nm.
5. The enhanced lost circulation gel of claim 4, wherein the inorganic nanoparticles are one or more of silica, titanium dioxide, zinc oxide, manganese dioxide particles.
6. The enhanced lost circulation gel of claim 1, wherein the fiber reinforcement is a plant fiber powder.
7. The reinforced leaking stoppage gel as claimed in claim 6, wherein the particle size of the fiber reinforcing agent is 40-80 meshes, and the fiber reinforcing agent is one or more of walnut shell powder, coconut shell powder and jujube kernel powder.
8. The enhanced lost circulation gel of claim 1, wherein the cross-linking agent is a phenolic water-soluble condensation polymer.
9. The enhanced lost circulation gel of claim 1, wherein the antioxidant is sodium bisulfite or thiourea.
10. A method for preparing the enhanced plugging gel as claimed in any one of claims 1 to 9, which comprises the following steps: firstly, dissolving an antioxidant in water; then sequentially dispersing the polyacrylamide polymer, the nano reinforcing agent, the fiber reinforcing agent and the cross-linking agent in water, and uniformly mixing to obtain enhanced plugging gel base fluid; and carrying out crosslinking reaction on the base solution of the enhanced plugging gel for 2-12h to obtain the enhanced plugging gel.
CN202010598015.8A 2020-06-28 2020-06-28 Enhanced leaking stoppage gel and preparation method thereof Pending CN111574976A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112280543A (en) * 2020-10-29 2021-01-29 中国石油化工集团有限公司 Composite gel plugging material and composite gel plugging slurry
CN114214046A (en) * 2022-01-24 2022-03-22 西南石油大学 High-temperature-resistant modified manganese dioxide nano plugging agent and oil-based drilling fluid
CN116023914A (en) * 2023-01-06 2023-04-28 山东滨州昱诚化工科技有限公司 Gel plugging agent and preparation method and application thereof
CN116656329A (en) * 2023-05-25 2023-08-29 河南易发石油工程技术有限公司 Nano polymer gel for water shutoff and profile control

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112280543A (en) * 2020-10-29 2021-01-29 中国石油化工集团有限公司 Composite gel plugging material and composite gel plugging slurry
CN114214046A (en) * 2022-01-24 2022-03-22 西南石油大学 High-temperature-resistant modified manganese dioxide nano plugging agent and oil-based drilling fluid
CN116023914A (en) * 2023-01-06 2023-04-28 山东滨州昱诚化工科技有限公司 Gel plugging agent and preparation method and application thereof
CN116656329A (en) * 2023-05-25 2023-08-29 河南易发石油工程技术有限公司 Nano polymer gel for water shutoff and profile control

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Application publication date: 20200825