阅读说明：本技术 一种石油勘探钻井液用无荧光防塌降失水剂及制备方法 (Non-fluorescent anti-collapse fluid loss agent for petroleum exploration drilling fluid and preparation method thereof ) 是由 李振华 于 2019-10-08 设计创作，主要内容包括：本发明公开了一种石油勘探钻井液用无荧光防塌降失水剂,是由下列方法制得：利用煤矿中废弃的煤矸石与碱及水在95-100℃条件下提取腐植酸钠；废腈纶丝在碱性条件下,温度110-150℃,水解丙烯腈钠盐；上述两种中间体接枝共聚,加入反应釜中反应形成腐植酸钠多元共聚物。本发明配成1%的水溶液注入井下,在井壁周围形成坚韧膜,防止钻井液渗透,减少钻井的摩擦系数、阻力,提高钻井速度,本发明产品无荧光,完井测录井时测储油量准确,不受干扰,而其他同类产品由有荧光成份测录井储油量受干扰误差。本发明还公开了一种石油勘探钻井液用无荧光防塌降失水剂的制备方法。(The invention discloses a non-fluorescent anti-collapse fluid loss agent for petroleum exploration drilling fluid, which is prepared by the following method: extracting sodium humate from waste coal gangue, alkali and water in coal mine at 95-100 deg.C; hydrolyzing acrylonitrile sodium salt by the waste acrylic fiber yarn under the alkaline condition at the temperature of 110-150 ℃; the two intermediates are subjected to graft copolymerization and added into a reaction kettle to react to form the sodium humate multipolymer. The invention is prepared into 1% water solution to be injected into the well, and forms a tough film around the well wall, thereby preventing the penetration of drilling fluid, reducing the friction coefficient and resistance of the well, and improving the well drilling speed. The invention also discloses a preparation method of the non-fluorescent anti-collapse fluid loss agent for the petroleum exploration drilling fluid.)

1. A non-fluorescent anti-collapse fluid loss agent for petroleum exploration drilling fluid is prepared by the following steps:

a. extracting sodium humate from waste coal gangue, alkali and water in coal mine at 95-100 deg.C;

b. hydrolyzing acrylonitrile sodium salt by the waste acrylic fiber yarn under the alkaline condition at the temperature of 110-150 ℃;

c. the two intermediates are subjected to graft copolymerization and added into a reaction kettle to react to form the sodium humate multipolymer.

2. The non-fluorescent anti-collapse and anti-dropping agent for the drilling fluid for the petroleum exploration, as claimed in claim 1, wherein in the step a, the reaction is carried out for 4h-8h by using 400% coal gangue in an alkali ratio of 1: 150; in the step b, 1: 2-25% of waste acrylic fibers in percentage by weight of alkali are hydrolyzed under the condition of 140 ℃ at 130-; in the step c, two intermediates are subjected to graft copolymerization according to the weight ratio of acrylonitrile sodium salt 1: reacting 2-25% sodium humate at 90 deg.C for 2h, and drying.

3. The preparation method of the non-fluorescence anti-sloughing and fluid loss agent for the petroleum exploration drilling fluid as claimed in claim 1, comprising the following steps:

a. extracting sodium humate from waste coal gangue, alkali and water in coal mine at 95-100 deg.C;

b. hydrolyzing acrylonitrile on the waste acrylic fibers at the temperature of 110-150 ℃ and 0.6Mpa under the alkaline condition;

c. the two intermediates are subjected to graft copolymerization and added into a reaction kettle to react to form the sodium humate multipolymer.

Technical Field

The invention relates to a non-fluorescent anti-collapse fluid loss agent for petroleum exploration drilling fluid and a preparation method thereof.

Technical Field

In the process of petroleum drilling, in order to reduce the filtration of drilling fluid for petroleum exploration, a certain amount of anti-collapse and anti-loss agent is required to be added, and sulfonated asphalt is commonly used, but the fluorescence false image on drill cuttings is often caused in the drilling process, so the normal operation is seriously interfered, and the limitation is caused. In addition, the stacking of the waste coal gangue in the coal mine occupies a large amount of land, and dry dust flies after the coal gangue is exposed to rain, so that air pollution is caused to the periphery. A large amount of acrylic staple fibers and wool generated in the spinning process of a production workshop of a chemical fiber plant cannot be treated and buried underground, and are never degraded, so that serious harm is caused to the offspring; harmful substances are generated by combustion, air is polluted, and harm is caused to people. The effective utilization of the waste short fibers and the hair of the acrylic fibers and the gangue is a critical priority.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a non-fluorescent anti-collapse fluid loss agent for petroleum exploration drilling fluid, which is produced by fully utilizing waste materials.

The invention also aims to provide a preparation method of the non-fluorescent anti-collapse fluid loss agent for the petroleum exploration drilling fluid.

In order to achieve the purpose, the technical scheme provided by the invention is as follows:

a non-fluorescent anti-collapse fluid loss agent for petroleum exploration drilling fluid is prepared by the following steps:

a. extracting sodium humate from waste coal gangue, alkali and water in coal mine at 95-100 deg.C;

b. hydrolyzing acrylonitrile sodium salt by the waste acrylic fiber yarn under the alkaline condition at the temperature of 110-150 ℃;

c. the two intermediates are subjected to graft copolymerization and added into a reaction kettle to react to form the sodium humate multipolymer.

Further, reacting for 4-8 h to extract sodium humate from 400% coal gangue with the weight ratio of alkali of 1:150 in the step a; in the step b, 1: 2-25% of waste acrylic fibers in percentage by weight of alkali are hydrolyzed under the condition of 140 ℃ at 130-; in the step c, two intermediates are subjected to graft copolymerization according to the weight ratio of acrylonitrile sodium salt 1: reacting 2-25% sodium humate at 90 deg.C for 2h, and drying.

The preparation method of the non-fluorescent anti-collapse fluid loss agent for the petroleum exploration drilling fluid comprises the following steps:

a. extracting sodium humate from waste coal gangue, alkali and water in coal mine at 95-100 deg.C;

b. hydrolyzing acrylonitrile on the waste acrylic fibers at the temperature of 110-150 ℃ and 0.6Mpa under the alkaline condition;

c. the two intermediates are subjected to graft copolymerization and added into a reaction kettle to react to form the sodium humate multipolymer.

The reaction mechanism of the present invention:

humic acid and polypropylene hydrolysate are grafted and copolymerized to form a novel copolymer.

The invention relates to a non-fluorescence anti-collapse fluid loss agent for petroleum exploration drilling fluid, which is prepared into 1 percent aqueous solution to be injected into a well, a tough film is formed around the wall of the well, the penetration of drilling fluid is prevented, the friction coefficient and the resistance of the well drilling are reduced, and the well drilling speed is improved.

The anti-collapse water loss agent product of the invention uses 6-7 tons of waste material resources from drilling to well completion in the drilling process, solves the problem that a large amount of coal gangue is piled up to occupy a large amount of land by comprehensively utilizing 98 percent of waste materials, and simultaneously reduces the probability of peripheral pollution caused by flying of coal gangue powder in sunny days. The problem that a large amount of acrylic staple fibers and wool generated in the fiber poking process of a production workshop of a chemical fiber plant cannot be treated is solved, and the ecological environment is protected. The invention fully utilizes waste resources to produce the anti-collapse agent water loss agent with advanced technical level in China, removes the pollution of waste and produces products with high added value.

Drawings

FIG. 1 is a process flow diagram of the present invention.

Detailed Description

A preparation method of a non-fluorescent anti-collapse fluid loss agent for petroleum exploration drilling fluid comprises the following steps:

a. reacting waste coal gangue, alkali and water in a coal mine at 95-100 ℃ for 4-8 h by using 400% of coal gangue in an alkali ratio of 1:150 to extract sodium humate;

b. hydrolyzing acrylonitrile sodium salt by using waste acrylic fibers at the temperature of 110-150 ℃ and preferably at the temperature of 130-140 ℃ and under the conditions that the weight ratio of alkali is 1: 2-25% and the hydrolysis time is 8-12 h under the alkaline condition;

c. and (3) carrying out graft copolymerization on the two intermediates, adding the two intermediates into a reaction kettle, and reacting to form the sodium humate multipolymer, wherein the graft copolymerization of the two intermediates is carried out according to the weight ratio of acrylonitrile sodium salt 1: reacting 2-25% sodium humate at 90 deg.C for 2h, and drying.

The non-fluorescent anti-collapse fluid loss agent for the petroleum exploration drilling fluid is prepared by the preparation method.

The process flow diagram of the present invention can be referred to fig. 1.

The above description is merely a detailed description of an example of the present invention, but the present invention is not limited to the above embodiments. It is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

After the fluorescence-free anti-collapse and water loss agent FH-610 for the drilling fluid is industrially produced, a well descending test is carried out in a victory oil field, mud shale in large sections of stratums of an east-oriented group and a sand and river street group of a block where a test well is located is extremely developed and has abnormal pressure, the content of montmorillonite illite in the mud shale is high, the mud shale is easy to hydrate and expand and collapse, and the filtration loss of the drilling fluid is strictly controlled in drilling construction in the area so as to reduce the soaking of filtrate in the stratums and prevent collapse accidents.

The test well uses the non-fluorescent anti-collapse fluid loss agent FH-610 for the drilling fluid as the fluid loss agent to obtain ideal use effect, each index meets the design requirement, the actual underground requirement is met, the well construction is smooth, the underground safety is realized, the use of the non-fluorescent anti-collapse fluid loss agent provides effective anti-collapse guarantee for the drilling construction, and in addition, the product is non-fluorescent and does not interfere with geological logging.

The specific energy adding property of the fluorescence-free anti-collapse fluid loss additive FH-610 for the drilling fluid is found in the test process. The anti-collapse and anti-loss water agent used originally can not fully meet the technical requirements of drilling well which is continuously developed, so that the company takes the market as a guide to research and develop a high-technology product which can resist temperature up to 230 ℃ and can resist salt to saturation, namely a fluorescence-free anti-collapse and anti-loss water agent FH-610 product for the drilling fluid.

The invention relates to a fluorescence-free anti-collapse and anti-drop agent FH-610 product, which is prepared by extracting fulvic acid (or fulvic acid), fulvic acid (or melilotic acid) and fulvic acid (or humic acid) from coal gangue, and carrying out graft polymerization reaction on the three humic acids and a copolymer of propylene and derivatives thereof under the action of a catalyst at a certain temperature and pressure to form a product, and carrying out spray drying on the product to obtain a finished product. The product is not a simple compound, but a mixture with different sizes, structures and compositions, and the molecules of the product contain a plurality of functional groups, such as carboxyl, acylamino, hydroxyl and nitrile groups.

The liquid non-fluorescent anti-collapse and water loss agent FH-610 can be used in fresh water drilling fluid, seawater drilling fluid and saturated salt water drilling fluid in petroleum drilling engineering, and the temperature resistance of the liquid non-fluorescent anti-collapse and water loss agent FH-610 can reach 230 ℃. The product can be used in land drilling and ocean drilling, can effectively prevent or inhibit the surface hydration and the water inrush liquefaction of the mud shale of the well wall after being added into the drilling fluid, greatly reduces the high-temperature and high-pressure filtration loss and the mud cake permeability of the drilling fluid, and reduces the amount of the filtrate of the drilling fluid entering a stratum as much as possible, thereby achieving the effect of stabilizing the well wall. The product is subjected to a water loss reducing performance parallelism comparison test with similar products used in the current drilling production, and the results are shown in table 1.

Table 1: comparative experiment report

The data in table 1 show that the fluorescence-free anti-collapse fluid loss additive FH-610 for drilling fluid has very obvious advantages compared with other similar products in both the normal-temperature and high-temperature pressure filtration loss of fresh water drilling fluid or brine drilling fluid.

The fluorescence-free anti-collapse and water loss agent FH-610 for the drilling fluid is tested by a quality supervision and inspection center of chemical agents in oil fields in the petroleum industry, and the result is shown in Table 2.

Table 2: report of test results

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