阅读说明：本技术 一种抗高温抗饱和盐生物质润滑剂及其制备方法 (High-temperature-resistant and saturated-salt-resistant biological lubricant and preparation method thereof ) 是由 单海霞 王中华 徐勤 李彬 *** 周亚贤 于 2018-07-09 设计创作，主要内容包括：本发明提供了一种抗高温抗饱和盐生物质润滑剂,以重量份计,包括：60～80份的月桂醇烷基醚；13～37份的油酸钾溶液；2～5份的乳化剂；1～2份的增粘剂。本发明提供的润滑剂中月桂醇烷基醚和油酸钾溶液具有协同,二者相互配合共同作用,能够使得到的润滑剂具有抗高温、抗饱和盐的效果,而且本发明提供的润滑剂绿色无毒、易于生物分解,尤其适用于储层埋藏深、高温高压的油气井,适用于大位移井、斜井及水平井等特殊井作业。本发明还提供了上述技术方案所述的抗高温抗饱和盐生物质润滑剂的制备方法。(The invention provides a high-temperature-resistant anti-saturated salt biomass lubricant, which comprises the following components in parts by weight: 60-80 parts of lauryl alcohol alkyl ether; 13-37 parts of a potassium oleate solution; 2-5 parts of an emulsifier; 1-2 parts of a tackifier. The lauryl alcohol alkyl ether and the potassium oleate solution in the lubricant provided by the invention have synergy, and the lauryl alcohol alkyl ether and the potassium oleate solution are mutually matched and act together, so that the obtained lubricant has the effects of high temperature resistance and saturated salt resistance. The invention also provides a preparation method of the high-temperature-resistant and saturated-salt-resistant biomass lubricant.)

1. A high temperature resistant anti-saturation salt biomass lubricant comprises the following components in parts by weight:

60-80 parts of lauryl alcohol alkyl ether;

13-37 parts of a potassium oleate solution;

2-5 parts of an emulsifier;

1-2 parts of a tackifier.

2. The high temperature resistant, saturated salt tolerant biomass lubricant of claim 1, wherein the lauryl alcohol alkyl ether has the structure of formula I:

in the formula I, R is an alkyl group having 1-10 carbon atoms.

3. The high temperature resistant anti-saturation salt biomass lubricant according to claim 1, wherein the mass concentration of the potassium oleate solution is 10-25%.

4. The high temperature resistant and salt-saturation resistant biomass lubricant according to claim 1, wherein the emulsifier is selected from one or more of sorbitan monooleate, propylene glycol monostearate, diacetyl tartaric acid ester of monoglycerides, and stearyl lactylate.

5. The high temperature resistant and salt tolerant biomass lubricant of claim 4, wherein the stearoyl lactylate is selected from one or more of sodium stearoyl emulsion, calcium stearoyl lactylate, and calcium stearoyl lactylate-lactylate.

6. The high temperature resistant, saturated salt tolerant biomass lubricant of claim 1, wherein the viscosity increasing agent is high viscosity sodium carboxymethyl cellulose; the polymerization degree of glucose in the high-viscosity sodium carboxymethyl cellulose is 200-600.

7. A method of making the high temperature resistant anti-saturate salt biolubricant of claim 1, comprising:

and mixing lauryl alcohol alkyl ether, a potassium oleate solution, an emulsifier and a tackifier to obtain the high-temperature-resistant anti-saturated salt biomass lubricant.

8. The method according to claim 7, wherein the temperature of the mixing is 40-60 ℃;

the mixing time is 1-3 hours.

9. The method of claim 7, wherein the mixing is performed under agitation.

10. The method of claim 9, wherein the stirring speed is 1200 to 1800 r/min.

Technical Field

The invention relates to the technical field of oil and gas well exploitation, in particular to a high-temperature-resistant and saturated-salt-resistant biomass lubricant and a preparation method thereof.

Background

Nowadays, with the increasing expansion of the field of oil exploration and development, the drilling stratum is deepened continuously, the drilling mode is renovated continuously, and the drilling difficulty is increased gradually. Wells with special conditions such as deep wells, ultra-deep wells, directional wells, horizontal wells, extended reach wells, slim-hole wells, high-density long open-hole wells and the like are increasing day by day, the drilling speed needs to be greatly improved, and the complex problems can be solved by using the lubricant for the drilling fluid.

With the increasing probability of high temperature, high pressure, and formation of plaster and various complex strata, the lubricant is generally required to have good temperature resistance and salt resistance as well as abrasion resistance and wear resistance reduction. In addition, the drilling fluid is required to have good compatibility, no corrosion to metal, no environmental pollution, no influence on analysis and evaluation of stratum data, no toxicity or low toxicity, no fluorescence or low fluorescence, easy biodegradation, no foaming, no viscosity increase and no obvious influence on the rheological property of the drilling fluid.

The drilling fluid high-temperature resistant lubricant currently used in the oil and gas drilling industry in China has relatively few varieties and has certain limitations. For example, some drilling fluids are mixed with mineral oil such as crude oil, white oil and the like, which is not environment-friendly; some drilling fluids decompose and fail when the pH is above 10; some cause foaming of the drilling fluid; some are difficult to disperse in saline, etc. In practical applications, however, many areas must be drilled with consideration of high temperature and pressure, drilling fluid foaming, and inorganic salt corrosion. Therefore, the development of the lubricant which integrates multiple functions of green, strong lubrication, temperature resistance, salt resistance, compatibility and the like has very important practical significance.

Disclosure of Invention

In view of the above, the present invention aims to provide a high temperature resistant and saturated salt resistant biomass lubricant and a preparation method thereof.

The invention provides a high-temperature-resistant anti-saturated salt biomass lubricant, which comprises the following components in parts by weight:

60-80 parts of lauryl alcohol alkyl ether;

13-37 parts of a potassium oleate solution;

2-5 parts of an emulsifier;

1-2 parts of a tackifier.

In the present invention, the lauryl alcohol alkyl ether is preferably 65 to 75 parts by weight, more preferably 68 to 72 parts by weight, and most preferably 70 parts by weight. In the present invention, the lauryl alcohol alkyl ether preferably has a structural formula shown in formula I:

in the formula I, R is an alkyl group having 1-10 carbon atoms.

In the present invention, R is preferably an alkyl group having 1 to 8 carbon atoms, more preferably an alkyl group having 2 to 6 carbon atoms, and most preferably an alkyl group having 3 to 5 carbon atoms.

The source of the lauryl alcohol alkyl group is not particularly limited in the present invention, and the lauryl alcohol alkyl group can be prepared according to a preparation method of the lauryl alcohol alkyl group well known to those skilled in the art.

In the invention, the weight part of the potassium oleate solution is preferably 15-35 parts, more preferably 20-30 parts, and most preferably 25 parts. In the present invention, the potassium oleate solution is preferably an aqueous potassium oleate solution. In the invention, the mass concentration of the potassium oleate solution is preferably 10-25%, more preferably 15-20%, and most preferably 16-18%.

The invention adopts the potassium oleate solution as the component of the lubricant, the potassium oleate solution and lauryl alcohol alkyl ether in the invention have synergistic action, and under the mutual cooperation and combined action, the obtained lubricant has good comprehensive performance.

In the invention, the emulsifier is preferably 3-4 parts by weight, and more preferably 3.5 parts by weight. In the invention, the emulsifier is preferably one or more of sorbitan monooleate, propylene glycol monostearate, diacetyl tartaric acid monoglyceride and lactate stearate. In the invention, the stearic acid lactate is preferably one or more of sodium stearate lactate, calcium stearate lactate and sodium-calcium stearate lactate.

In the invention, the weight part of the tackifier is preferably 1.2-1.8 parts, and more preferably 1.4-1.6 parts. In the invention, the tackifier is preferably high-viscosity sodium carboxymethyl cellulose, namely CMC-HV, and the polymerization degree of glucose in the high-viscosity sodium carboxymethyl cellulose is preferably 200-600, more preferably 250-550, more preferably 300-500, more preferably 350-450, and most preferably 400.

The high-viscosity sodium carboxymethyl cellulose is preferably adopted as the tackifier, and the high-viscosity sodium carboxymethyl cellulose and lauryl alcohol alkyl ether have a synergistic effect, so that the lubricant provided by the invention has better comprehensive performance under the combined action of mutual cooperation.

The invention provides a preparation method of the high-temperature-resistant and saturated-salt-resistant biomass lubricant, which comprises the following steps:

and mixing lauryl alcohol alkyl ether, a potassium oleate solution, an emulsifier and a tackifier to obtain the high-temperature-resistant anti-saturated salt biomass lubricant.

In the invention, the dosage of the lauryl alcohol alkyl ether, the potassium oleate solution, the emulsifier and the tackifier is the same as the weight parts of the lauryl alcohol alkyl ether, the potassium oleate solution, the emulsifier and the tackifier in the technical scheme, and the description is omitted. In the present invention, the types and sources of the lauryl alcohol alkyl ether, the potassium oleate solution, the emulsifier and the tackifier are the same as those of the lauryl alcohol alkyl ether, the potassium oleate solution, the emulsifier and the tackifier described in the above technical solution, and are not described herein again.

In the present invention, the mixing is preferably carried out in a reaction vessel. In the invention, the mixing temperature is preferably 40-60 ℃, more preferably 45-55 ℃, and most preferably 50 ℃. In the present invention, the mixing time is preferably 1 to 3 hours, more preferably 1.5 to 2.5 hours, and most preferably 2 hours. In the invention, the mixing is preferably carried out under the condition of stirring, and the stirring speed is preferably 1200-1800 r/min, more preferably 1300-1700 r/min, more preferably 1400-1600 r/min, and most preferably 1500 r/min.

The high-temperature-resistant and saturated-salt-resistant biomass lubricant provided by the invention has the temperature resistance of 240 ℃ and good stability in water-based drilling fluid; the extreme pressure lubrication coefficient can be remarkably reduced, the reduction rate of the fresh water slurry lubrication coefficient is more than or equal to 90%, and the reduction rate of the saturated saline slurry lubrication coefficient is more than or equal to 75%, so that the extreme pressure lubrication system plays a vital role in reducing the underground complex conditions such as sticking and the like and ensuring safe, high-quality and rapid drilling. When the addition amount of the high-temperature-resistant saturated salt-resistant biomass lubricant in the base slurry is 1%, the apparent viscosity change is small, the bubble rate is less than 3%, the surface tension reduction rate is more than or equal to 50%, the compatibility in the water-based drilling fluid is good, the lubricant does not foam and is not tackified when added into the drilling fluid, and the rheological property of the drilling fluid is not obviously influenced. The biomass lubricant provided by the invention does not corrode metal, does not pollute the environment, does not influence the analysis and evaluation of stratum data, and has low fluorescence, and the fluorescence level is less than or equal to 3. After the biomass lubricant provided by the invention is added into drilling fluid, the filtration loss of the biomass lubricant is basically unchanged, and the biomass lubricant plays an important role in stabilizing a well wall. The biomass lubricant provided by the invention is green, nontoxic, low in price, simple, rapid and efficient in preparation method.

The high-temperature-resistant and saturated-salt-resistant biomass lubricant provided by the invention can solve the problems of poor high-temperature and high-pressure stability and the like of the existing drilling fluid, has the characteristics of high-temperature resistance, saturated salt resistance, environmental protection, no toxicity, easiness in biological decomposition, no fluorescence, low price and the like, can be well compatible with a water-based drilling fluid, and is particularly suitable for special drilling operations such as extended reach wells, inclined wells, horizontal wells and the like.

The high-temperature-resistant and saturated-salt-resistant biomass lubricant provided by the invention has the characteristics of green, high-temperature resistance and saturated salt resistance, no foaming and viscosity increase when the drilling fluid is added, no obvious influence on the rheological property of the drilling fluid and the like, and is suitable for well types such as vertical wells, inclined wells, horizontal wells and the like, and fresh water, seawater and saturated salt water systems.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other examples, which may be modified or appreciated by those of ordinary skill in the art based on the examples given herein, are intended to be within the scope of the present invention.

The starting materials used in the following examples of the present invention are all commercially available products.