阅读说明：本技术 一种耐高温高强度冻胶材料及其应用 (High-temperature-resistant high-strength jelly material and application thereof ) 是由 刘宇龙 熊青山 于 2020-12-18 设计创作，主要内容包括：本发明提供了一种耐高温高强度冻胶材料及其应用,该冻胶材料包括部分水解聚丙烯酰胺、有机交联剂和水,其中,以所述耐高温高强度冻胶材料的总质量计,部分水解聚丙烯酰胺的含量为0.4-0.9wt％,有机交联剂的含量为0.4-1.5wt％,余量为水；所述有机交联剂为多羟基有机交联剂。本发明针对特定水解度和分子量的部分水解聚丙烯酰胺,选用多羟基有机交联剂能大大提高冻胶材料的耐高温性能和耐压强度,并在此基础上通过调节其pH进一步优化其综合性能通过加入过硫酸铵,可使其具有优异的自破胶性能,破胶后黏度利于反排；其原料易得且价格低廉,使其用于油田具有良好的经济效益。(The invention provides a high-temperature-resistant high-strength jelly glue material and application thereof, wherein the jelly glue material comprises partially hydrolyzed polyacrylamide, an organic cross-linking agent and water, wherein the content of the partially hydrolyzed polyacrylamide is 0.4-0.9 wt%, the content of the organic cross-linking agent is 0.4-1.5 wt% and the balance is water, based on the total mass of the high-temperature-resistant high-strength jelly glue material; the organic cross-linking agent is a polyhydroxy organic cross-linking agent. Aiming at the partially hydrolyzed polyacrylamide with specific hydrolysis degree and molecular weight, the polyhydroxy organic cross-linking agent is selected to greatly improve the high temperature resistance and compressive strength of the gel material, and on the basis, the pH value of the gel material is adjusted to further optimize the comprehensive performance of the gel material, and the ammonium persulfate is added to ensure that the gel material has excellent self-gel-breaking performance, so that the viscosity after gel breaking is favorable for reverse discharge; the raw materials are easy to obtain and low in price, so that the oil field oil-water separator has good economic benefit when being used in oil fields.)

1. A high-temperature-resistant high-strength jelly glue material, which is characterized in that,

comprises partially hydrolyzed polyacrylamide, an organic cross-linking agent and water;

wherein, based on the total mass of the high-temperature resistant high-strength jelly glue material, the content of the partially hydrolyzed polyacrylamide is 0.4-0.9 wt%, the content of the organic cross-linking agent is 0.4-1.5 wt%, and the balance is water;

the organic cross-linking agent is a polyhydroxy organic cross-linking agent.

2. The high temperature resistant and high strength jelly glue material as claimed in claim 1,

also comprises a pH regulator;

the pH regulator is NaOH aqueous solution or hydrochloric acid aqueous solution.

3. The high temperature resistant and high strength jelly glue material as claimed in claim 2,

the addition amount of the pH regulator is to control the pH of the high-temperature-resistant high-strength jelly material to be 8-10;

preferably, the concentration of the pH adjusting agent is 1 wt%.

4. The high temperature resistant and high strength jelly glue material as claimed in claim 1,

also included are breakers;

the gel breaker is ammonium persulfate.

5. The high temperature resistant and high strength jelly glue material as claimed in claim 4,

the content of the gel breaker is 0.04-0.12 wt%.

6. The high temperature resistant and high strength jelly glue material according to any one of claims 1 to 5,

the hydrolysis degree of the partially hydrolyzed polyacrylamide is 27-30%, and the molecular weight is 1200-1500 ten thousand.

7. The high temperature resistant and high strength jelly glue material according to any one of claims 1 to 5,

the organic cross-linking agent is prepared by the following method:

adding 10g of sodium tetraborate into 50ml of 0.004 wt% sodium hydroxide aqueous solution, heating to 45-55 ℃, stirring to dissolve, adding 7.5g of glycerol, and heating to 62-68 ℃ for hydrolysis reaction to obtain the sodium tetraborate.

8. The high temperature resistant and high strength jelly glue material according to any one of claims 1 to 7,

the composite material consists of partially hydrolyzed polyacrylamide, a polyhydroxy organic cross-linking agent, a pH regulator, ammonium persulfate and water;

based on the total mass of the high-temperature-resistant high-strength jelly glue material, the content of partially hydrolyzed polyacrylamide is 0.7 wt%, the content of polyhydroxy organic cross-linking agent is 0.9 wt%, the content of pH regulator is used for controlling the pH of the high-temperature-resistant high-strength jelly glue material to be 9, the content of ammonium persulfate is 0.1 wt%, and the balance is water.

9. Use of the high temperature resistant high strength gel material of any one of claims 1 to 8 in underbalanced well completion.

Technical Field

The invention relates to the technical field of drilling and completion of oil and gas fields, in particular to a high-temperature-resistant high-strength jelly material and application thereof.

Background

In recent years, with the deep research and continuous development of the underbalanced drilling and completion technology, the application of the technology is more and more extensive at home and abroad; however, with the present field application of this technology, the risk of work is too high and the risk of a kick occurring is great.

The common stratum blocking modes in snubbing operation include chemical blocking and mechanical blocking technologies, the two modes can be operated in the stratum pressurized environment, and from the development of recent years, the chemical blocking has more advantages compared with the traditional mechanical blocking, the application is wider, and the economic evaluation is better. The jelly glue valve is taken as an intelligent chemical colloid, and is widely researched and applied as a downhole pressure control means newly developed in recent years.

The gel valve is high-elasticity gel, and has the functions in the well as follows: the temporary plugging device can temporarily plug a shaft and bear a certain pressure difference, thereby being beneficial to the normal implementation of underground work and being applied to snubbing operation and underbalanced drilling; the method specifically comprises the following steps: firstly, a proper amount of base glue solution is quickly injected into the underground, then the glue solution is kept for a period of time, the glue solution is fully gelatinized under the environments of temperature, pressure and the like of the stratum, and when the glue solution reaches a certain strength, the pressure of the stratum can be sealed by utilizing the viscosity generated by the contact of the glue solution and the pipe wall and the stratum, so that the overflow of oil gas is avoided.

Therefore, the technology of temporarily plugging the jelly plays a role in protecting the reservoir during the snubbing operation while simplifying construction operation and greatly reducing construction economic expenditure.

At present, certain achievements are obtained in the aspect of research on jelly materials at home and abroad, and meanwhile, the pace of oil-gas exploration and development is also rapidly advanced, so that the requirements on the performance of jelly are higher and higher in the face of more severe field operation environments.

In summary, in order to meet the requirements of fracturing operation and snubbing operation, it is important to prepare a high temperature resistant and high strength gel material and study a self-gel breaking method thereof on the basis, and the key technical problem to be solved by the technical personnel in the field is urgently needed.

Disclosure of Invention

The invention aims to provide a jelly glue material aiming at the technical problems in the prior art, and a self-breaking method and application thereof are discussed on the basis of the jelly glue material.

In order to achieve the purpose, the invention adopts the following technical scheme:

a high-temp-resistant high-strength jelly glue material is prepared from partially hydrolyzed polyacrylamide, organic cross-linking agent and water.

Wherein, based on the total mass of the high-temperature resistant and high-strength jelly glue material, the content of the partially hydrolyzed polyacrylamide is 0.4-0.9 wt%, the content of the organic cross-linking agent is 0.4-1.5 wt%, and the balance is water.

The organic cross-linking agent is a polyhydroxy organic cross-linking agent.

In the above technical scheme, the high temperature resistant and high strength jelly material further comprises a pH adjusting agent.

Specifically, in the above technical solution, the pH adjusting agent is an aqueous solution of NaOH or an aqueous solution of hydrochloric acid.

Further, in the above technical scheme, the addition amount of the pH regulator is to control the pH of the high temperature resistant and high strength jelly material to be 8-10.

Preferably, in the above technical solution, the concentration of the pH adjuster is 1 wt%.

In the technical scheme, the high-temperature-resistant high-strength gel material further comprises a gel breaker.

Specifically, in the above technical scheme, the gel breaker is ammonium persulfate.

Still further, in the above technical solution, the content of the breaker is 0.04-0.12 wt%.

In detail, in the above technical scheme, the degree of hydrolysis of the partially hydrolyzed polyacrylamide is 27-30%, and the molecular weight is 1200-1500 ten thousand.

In detail, in the above technical scheme, the organic cross-linking agent is prepared by the following method:

adding 10g of sodium tetraborate into 50ml of 0.004 wt% sodium hydroxide aqueous solution, heating to 45-55 ℃, stirring to dissolve, adding 7.5g of glycerol, and heating to 62-68 ℃ for hydrolysis reaction to obtain the sodium tetraborate.

In a preferred embodiment, the high-temperature-resistant high-strength jelly glue material consists of partially hydrolyzed polyacrylamide, a polyhydroxy organic cross-linking agent, a pH regulator, ammonium persulfate and water.

Specifically, in the high-temperature-resistant high-strength jelly glue material, based on the total mass of the high-temperature-resistant high-strength jelly glue material, the content of partially hydrolyzed polyacrylamide is 0.7 wt%, the content of a polyhydroxy organic cross-linking agent is 0.9 wt%, the content of a pH regulator is used for controlling the pH of the high-temperature-resistant high-strength jelly glue material to be 9, the content of ammonium persulfate is 0.1 wt%, and the balance is water.

The invention also provides application of the high-temperature-resistant high-strength gel material in underbalanced well completion.

Compared with the prior art, the invention has the beneficial effects that:

(1) the invention provides a high-temperature-resistant high-strength gel material, aiming at partially hydrolyzed polyacrylamide with specific hydrolysis degree and molecular weight, the high-temperature-resistant performance and compressive strength of the gel material can be greatly improved by selecting a polyhydroxy organic cross-linking agent; and further optimizing the comprehensive performance of the composite material by adjusting the pH value of the composite material on the basis; in addition, the ammonium persulfate is added, so that the self-gel-breaking performance is excellent, and the viscosity after gel breaking is favorable for reverse arrangement;

(2) the high-temperature-resistant high-strength gel material provided by the invention has the advantages that the preparation process is simple, the initial viscosity of the gel base liquid is low, the injectability is strong, the strength of the gel body is high, and the performance requirements on high gel strength, gel forming time and gel breaking in field non-well killing operation are met;

(3) the high-temperature-resistant high-strength jelly glue material provided by the invention has the advantages of easily available raw materials and low price, so that the high-temperature-resistant high-strength jelly glue material has good economic benefit when being used in oil fields.

Detailed Description

The present invention is further described in detail below with reference to specific examples so that those skilled in the art can more clearly understand the present invention.

The following examples are given for the purpose of illustration only and are not intended to limit the scope of the invention.

All other embodiments obtained by a person skilled in the art based on the specific embodiments of the present invention without any inventive step are within the scope of the present invention.

In the examples of the present invention, all the raw material components are commercially available products well known to those skilled in the art unless otherwise specified.

In the examples of the present invention, the partially hydrolyzed polyacrylamide was commercially available from Yiyuan environmental protection technology, Inc., Guangzhou, having a hydrolysis degree of 28% and a molecular weight of 1300 ten thousand.

In the examples of the present invention, the organic crosslinking agent used was prepared as follows:

adding 10g of sodium tetraborate into 50ml of 0.004 wt% sodium hydroxide aqueous solution, heating to 45-55 ℃, stirring to dissolve, adding 7.5g of glycerol, heating to 62-68 ℃, and carrying out hydrolysis reaction to obtain the cross-linking agent.

In the embodiment of the invention, the used water is tap water; the rest raw materials are conventional commercial products.

In the examples of the present invention, the pH adjusting agents used were an aqueous NaOH solution and an aqueous hydrochloric acid solution each having a concentration of 1 wt%.

Example 1

The embodiment of the invention provides a high-temperature-resistant high-strength jelly glue material, and a preparation method of the jelly glue material comprises the following steps:

taking a 500ml beaker, measuring 400ml of tap water by using a measuring cylinder, pouring the tap water into the beaker, stirring the mixture under the stirring of a stirrer, weighing partial hydrolyzed polyacrylamide by using a balance, adding the partial hydrolyzed polyacrylamide into the beaker in the stirring process, and stirring the mixture for 4 hours;

covering with a preservative film, and standing for 12h at normal temperature; then, continuously stirring the liquid in the beaker to uniformly mix the liquid;

weighing the organic cross-linking agent, adding the organic cross-linking agent, quickly transferring the organic cross-linking agent into a 500ml volumetric flask, adding the organic cross-linking agent into the flask after constant volume, stirring the mixture for 15min to uniformly mix the solution, and reacting the mixture to form the gel.

The specific formulation is shown in table 1 below.

TABLE 1 formulation of high temperature resistant high strength jelly glue material

The following table 2 shows the compressive strength and high temperature resistance of the high temperature resistant and high strength jelly glue materials with different formulations.

TABLE 2 compression strength and high temperature resistance of high temperature resistant high strength jelly glue materials with different formulations

Example 2

The embodiment of the invention provides a high-temperature-resistant high-strength jelly glue material, on the basis of the optimal formula of the embodiment 1 (the contents of partially hydrolyzed polyacrylamide and an organic cross-linking agent are respectively 0.7 wt% and 0.9 wt%), the influence of the pH on the compressive strength and the high-temperature resistance is discussed by adjusting the pH, the preparation method is similar to the embodiment 1, and the pH is adjusted by adding NaOH aqueous solution or hydrochloric acid aqueous solution.

The results are shown in table 3 below.

TABLE 3 compressive strength and high temperature resistance of jelly glue materials under different pH conditions

Example 3

On the basis of the optimal formula of the embodiment 1 (the contents of the partially hydrolyzed polyacrylamide and the organic cross-linking agent are respectively 0.7 wt% and 0.9 wt%), the influence of the addition amount of ammonium persulfate on the gel forming time, the gel breaking time, the compressive strength and the high-temperature resistance is discussed by adding different amounts of ammonium persulfate, and the preparation method of the high-temperature-resistant high-strength gel material is similar to that of the embodiment 1.

The results are shown in Table 4 below.

TABLE 3 comprehensive Properties of jelly glue materials with different ammonium persulfate additions

According to the high-temperature-resistant high-strength jelly glue material provided by the embodiment of the invention, aiming at partially hydrolyzed polyacrylamide with a specific hydrolysis degree and a specific molecular weight, the high-temperature resistance and the compressive strength of the jelly glue material can be greatly improved by selecting the polyhydroxy organic cross-linking agent, and the comprehensive performance of the jelly glue material is further optimized by adjusting the pH value of the jelly glue material; in addition, the ammonium persulfate is added, so that the self-gel-breaking performance is excellent, and the viscosity after gel breaking is favorable for reverse arrangement; the high-temperature-resistant high-strength gel material provided by the embodiment of the invention has the advantages of simple preparation process, low initial viscosity of the gel base fluid, strong injectability and high gel body strength, and meets the performance requirements on high gel strength, gel forming time and gel breaking in field non-well killing operation; the high-temperature-resistant high-strength jelly glue material provided by the embodiment of the invention has the advantages of easily available raw materials and low price, so that the high-temperature-resistant high-strength jelly glue material has good economic benefit when being used in oil fields.

Finally, the method of the present invention is only a preferred embodiment and is not intended to limit the scope of the present invention. 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.