阅读说明：本技术 一种稀释剂及其制备方法和应用 (Diluent and preparation method and application thereof ) 是由 葛炼 钱帆 李万强 罗宇峰 王姝蕾 吴义 张斌 陈智 万伟 于 2019-09-28 设计创作，主要内容包括：本发明公开了一种稀释剂及其制备方法和应用。该稀释剂,包括以下重量份的组分：葡聚糖60～80份、环己胺30～50份、催化剂1～5份、二氯亚砜1～5份、十二烷基苯磺酸10～20份,以及氧化剂5～10份；其制备方法为：(1)按配方将葡聚糖与氧化剂混合,调节体系pH值为9～11,于室温搅拌反应5～8h；(2)将步骤(1)所得产物与二氯亚砜混合,搅拌反应1～2h,然后加入催化剂和环己胺,升温至80～100℃继续反应2～3h后,保温0.5～1h；(3)将步骤(2)所得产物与十二烷基苯磺酸混合,于130～150℃搅拌反应1～2h即可。本发明制备得到的稀释剂耐温性能好,能够有效的降低钻井液的粘度。(The invention discloses a diluent and a preparation method and application thereof. The diluent comprises the following components in parts by weight: 60-80 parts of glucan, 30-50 parts of cyclohexylamine, 1-5 parts of a catalyst, 1-5 parts of thionyl chloride, 10-20 parts of dodecylbenzene sulfonic acid and 5-10 parts of an oxidant; the preparation method comprises the following steps: (1) mixing glucan and an oxidant according to a formula, adjusting the pH value of a system to be 9-11, and stirring and reacting for 5-8 hours at room temperature; (2) mixing the product obtained in the step (1) with thionyl chloride, stirring and reacting for 1-2 h, then adding a catalyst and cyclohexylamine, heating to 80-100 ℃, continuing to react for 2-3 h, and then preserving heat for 0.5-1 h; (3) and (3) mixing the product obtained in the step (2) with dodecylbenzene sulfonic acid, and stirring and reacting for 1-2 hours at 130-150 ℃. The diluent prepared by the invention has good temperature resistance and can effectively reduce the viscosity of the drilling fluid.)

1. The diluent is characterized by comprising the following components in parts by weight:

60-80 parts of glucan, 30-50 parts of cyclohexylamine, 1-5 parts of a catalyst, 1-5 parts of thionyl chloride, 10-20 parts of dodecylbenzene sulfonic acid and 5-10 parts of an oxidant.

2. The diluent of claim 1, comprising the following components in parts by weight:

80 parts of glucan, 30 parts of cyclohexylamine, 3 parts of a catalyst, 5 parts of thionyl chloride, 16 parts of dodecylbenzene sulfonic acid and 5 parts of an oxidant.

3. The diluent of claim 1 or 2, wherein the catalyst is a lye.

4. The diluent of claim 1 or 2, wherein the oxidant comprises the following components in parts by weight: 5-10 parts of sodium hypochlorite, 1-5 parts of sodium bromide and 5-10 parts of tetramethyl piperidine nitrogen oxide.

5. The diluent of claim 4, wherein the oxidant comprises the following components in parts by weight: 8 parts of sodium hypochlorite, 3 parts of sodium bromide and 5 parts of tetramethyl piperidine oxynitride.

6. A process for the preparation of a diluent as claimed in any one of claims 1 to 5, comprising the steps of:

(1) mixing glucan and an oxidant according to a formula, adjusting the pH value of a system to be 9-11, and stirring and reacting for 5-8 hours at room temperature;

(2) mixing and dissolving the product obtained in the step (1) and thionyl chloride, stirring and reacting for 1-2 h, then adding a catalyst and cyclohexylamine, heating to 80-100 ℃, continuing to react for 2-3 h, and then preserving heat for 0.5-1 h;

(3) and (3) mixing the product obtained in the step (2) with dodecylbenzene sulfonic acid, and stirring and reacting for 1-2 hours at 130-150 ℃.

7. The method according to claim 6, wherein the reaction temperature in the step (2) is 85 ℃ and the reaction time is 2 hours.

8. Use of the diluent of any one of claims 1 to 7 in the preparation of a water-based drilling fluid.

Technical Field

The invention belongs to the technical field of drilling, and particularly relates to a diluent as well as a preparation method and application thereof.

Background

With the development of the petroleum industry, drilling is deeper and deeper, the bottom hole temperature is higher and higher, and therefore the pressure of the drilled stratum is higher and higher, and the drilling fluid with more excellent use performance is needed. The drilling fluid is an important fluid in the drilling engineering, the performance of the drilling fluid is directly related to the quality of the drilled well, and the drilling fluid plays a vital role in the oil extraction efficiency of an oil field. With the rapid development of deep well drilling technology, the technical problem of drilling fluid for deep wells and ultra-deep wells is more and more prominent.

The drilling fluid is easy to thicken under the conditions of deepening of a well, increasing of temperature and increasing of pressure, a diluent is usually required to be added for adjustment, but the existing diluent is often poor in effect, poor in temperature resistance and the like.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides the diluent and the preparation method and the application thereof, and can effectively solve the problems of poor dilution effect and poor temperature resistance of the existing diluent on the water-based drilling fluid.

In order to achieve the purpose, the technical scheme adopted by the invention for solving the technical problems is as follows:

a diluent comprises the following components in parts by weight:

60-80 parts of glucan, 30-50 parts of cyclohexylamine, 1-5 parts of a catalyst, 1-5 parts of thionyl chloride, 10-20 parts of dodecylbenzene sulfonic acid and 5-10 parts of an oxidant.

Further, the paint comprises the following components in parts by weight:

80 parts of glucan, 30 parts of cyclohexylamine, 3 parts of catalyst, 5 parts of thionyl chloride, 16 parts of dodecylbenzene sulfonic acid and 5 parts of oxidant

Further, the catalyst is alkali liquor.

Further, the oxidant comprises the following components in parts by weight: 5-10 parts of sodium hypochlorite, 1-5 parts of sodium bromide and 5-10 parts of tetramethyl piperidine nitrogen oxide.

Further, the oxidant comprises the following components in parts by weight: 8 parts of sodium hypochlorite, 3 parts of sodium bromide and 5 parts of tetramethyl piperidine oxynitride.

The preparation method of the diluent comprises the following steps:

(1) mixing glucan and an oxidant according to a formula, adjusting the pH value of a system to be 9-11, and stirring and reacting for 5-8 hours at room temperature;

(2) mixing the product obtained in the step (1) with thionyl chloride, stirring and reacting for 1-2 h, then adding a catalyst and cyclohexylamine, heating to 80-100 ℃, continuing to react for 2-3 h, and then preserving heat for 0.5-1 h;

(3) and (3) mixing the product obtained in the step (2) with dodecylbenzene sulfonic acid, and stirring and reacting for 1-2 hours at 130-150 ℃.

Further, the reaction temperature in the step (2) is 85 ℃, and the reaction time is 2 h.

The diluent is applied to the preparation of water-based drilling fluid.

The invention has the beneficial effects that:

1. through the reaction of sodium hypochlorite, sodium bromide and tetramethylpiperidine oxynitride with glucan, partial hydroxyl in the glucan can be oxidized into carboxyl, so that the carboxyl content in the whole glucan is improved, the carboxyl has electronegativity and hydration action, the electronegativity of the surfaces of clay particles is enhanced, the hydration layer action is enhanced, the network structure of the clay particles can be effectively dispersed or weakened, and the viscosity and the shear force of the drilling fluid are reduced; meanwhile, phenolic hydroxyl in the glucan can be adsorbed with aluminum ions at the bond-broken positions on the surfaces of the clay particles, so that the dilution effect of the glucan on the drilling fluid is further improved.

2. After partial hydroxyl in the glucan is converted into carboxyl, the carboxyl reacts with thionyl chloride and cyclohexylamine under the action of an alkaline catalyst, so that the carboxyl can be amidated with the cyclohexylamine to generate an amide group, and the temperature resistance of the prepared diluent can be effectively improved; meanwhile, the cyclohexylamine is alkaline primary amine, so that a certain alkaline condition can be provided for the reaction, and the smooth proceeding of the reaction is further ensured.

3. The dilution performance of the glucan on the drilling fluid can be ensured only by ensuring a certain amount of carboxyl, and the amine value in the subsequent amidation reaction process, namely the amidation degree, can be limited by adding the dodecylbenzene sulfonic acid, so that enough carboxyl groups are ensured in the glucan.

4. The diluent prepared by the method can contain a large amount of hydroxyl and carboxyl which are hydrophilic groups, so that the prepared diluent also has hydrophilicity and can be well compatible with water-based drilling fluid.

Detailed Description

The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.