CN108130060B - Environment-friendly clay-free strong-inhibition drilling fluid and preparation method thereof - Google Patents
Environment-friendly clay-free strong-inhibition drilling fluid and preparation method thereofDownload PDFInfo
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/06—Clay-free compositions
- C09K8/08—Clay-free compositions containing natural organic compounds, e.g. polysaccharides, or derivatives thereof
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Abstract
Translated fromChineseDescription
Translated fromChinese技术领域technical field
本发明涉及钻井液及其制备方法技术领域，是一种环保型无粘土强抑制钻井液及其制备方法。The invention relates to the technical field of drilling fluid and a preparation method thereof, and is an environment-friendly clay-free strong inhibition drilling fluid and a preparation method thereof.
背景技术Background technique
钻井液是石油钻井作业使用的一种循环流体，它通常由水、造浆粘土、各种处理剂组成。钻井液的功能是确保安全顺利、优质快速钻井和完井。钻井液技术发展到现在，各种满足钻井要求的钻井液体系越来越多，各有特点。国家新的环保法实施，要求钻井液无毒、可生物降解，产生的钻屑必须检测合格才能排放，因此钻井液既要满足环保要求、又要满足功能要求，对钻井液技术是一个新的课题和挑战。研究和使用环保钻井液是大势所趋，是实现绿色可持续发展的必然要求。Drilling fluid is a circulating fluid used in oil drilling operations. It usually consists of water, slurry clay, and various treatment agents. The function of drilling fluids is to ensure safe, smooth, high-quality rapid drilling and completions. With the development of drilling fluid technology, there are more and more drilling fluid systems that meet drilling requirements, each with its own characteristics. The implementation of the new national environmental protection law requires drilling fluids to be non-toxic and biodegradable, and the drill cuttings produced must be tested and passed before they can be discharged. Therefore, drilling fluids must meet both environmental protection requirements and functional requirements, which is a new aspect of drilling fluid technology. issues and challenges. The research and use of environmentally friendly drilling fluids is the general trend and an inevitable requirement to achieve green and sustainable development.
发明内容SUMMARY OF THE INVENTION
本发明提供了一种环保型无粘土强抑制钻井液及其制备方法，该环保型无粘土强抑制钻井液具有较强的抑制性。The invention provides an environment-friendly non-clay strong inhibitory drilling fluid and a preparation method thereof. The environment-friendly non-clay strong inhibitory drilling fluid has strong inhibitory properties.
本发明的技术方案之一是通过以下措施来实现的：一种环保型无粘土强抑制钻井液，原料包括复合盐水、降解型增粘剂、硅酸钠、生石灰和超细碳酸钙，原料按质量比计，复合盐水：降解型增粘剂：硅酸钠：生石灰：超细碳酸钙=100：0.3至1.0：3至5：0.5至1：2至3。One of the technical solutions of the present invention is realized by the following measures: an environment-friendly clay-free strong inhibition drilling fluid, the raw materials include complex brine, degradable tackifier, sodium silicate, quicklime and ultrafine calcium carbonate, and the raw materials are Mass ratio meter, complex brine: degradable tackifier: sodium silicate: quicklime: superfine calcium carbonate = 100: 0.3 to 1.0: 3 to 5: 0.5 to 1: 2 to 3.
下面是对上述发明技术方案之一的进一步优化或/和改进：The following is a further optimization or/and improvement of one of the above-mentioned technical solutions of the invention:
上述按下述步骤得到：第一步，在搅拌状态下，向所需量的复合盐水中加入所需量的硅酸钠、生石灰和超细碳酸钙混合后得到混合液一；第二步中，采用氢氧化钠溶液将混合液一的pH值调节至7至9；第三步，向第二步得到的混合液一中加入所需量的降解型增粘剂搅拌至降解型增粘剂完全溶解后得到混合液二，混合液二的漏斗粘度为40s至60s后得到环保型无粘土强抑制钻井液。Above-mentioned obtains by following steps: the first step, under stirring state, in required amount of complex brine, add required amount of sodium silicate, quicklime and ultrafine calcium carbonate to mix and obtain mixed solution one; in the second step , using sodium hydroxide solution to adjust the pH value of the mixed solution 1 to 7 to 9; the third step, add the required amount of degradable thickener to the mixed solution 1 obtained in the second step and stir until the degradable thickener After completely dissolving, a mixed liquid 2 is obtained, and the funnel viscosity of the mixed liquid 2 is 40s to 60s to obtain an environment-friendly non-clay strong inhibition drilling fluid.
上述复合盐水为海水、咸水和卤水中的一种以上，并且复合盐水的密度为1.05g/cm3至1.50 g/cm3。The above-mentioned composite brine is one or more of seawater, salt water, and brine, and the composite brine has a density of 1.05 g/cm3 to 1.50 g/cm3 .
上述降解型增粘剂为黄原胶。The above-mentioned degradable tackifier is xanthan gum.
上述硅酸钠的模数为2.4至3.6，硅酸钠为工业级硅酸钠。The modulus of the above-mentioned sodium silicate is 2.4 to 3.6, and the sodium silicate is technical grade sodium silicate.
上述生石灰为工业级生石灰；或/和，氢氧化钠为工业级氢氧化钠。The above-mentioned quicklime is industrial-grade quicklime; or/and, the sodium hydroxide is technical-grade sodium hydroxide.
上述超细碳酸钙的细度为5um至10um。The fineness of the above-mentioned ultrafine calcium carbonate is 5um to 10um.
本发明的技术方案之二是通过以下措施来实现的：一种环保型无粘土强抑制钻井液的制备方法，按下述步骤进行：第一步，在搅拌状态下，向所需量的复合盐水中加入所需量的硅酸钠、生石灰和超细碳酸钙混合后得到混合液一；第二步中，采用氢氧化钠溶液将混合液一的pH值调节至7至9；第三步，向第二步得到的混合液一中加入所需量的降解型增粘剂搅拌至降解型增粘剂完全溶解后得到混合液二，混合液二的漏斗粘度为40s至60s后得到环保型无粘土强抑制钻井液。The second technical scheme of the present invention is realized by the following measures: a preparation method of an environment-friendly clay-free strong inhibition drilling fluid, which is carried out according to the following steps: the first step, under stirring state, to the required amount of compound Add the required amount of sodium silicate, quicklime and ultrafine calcium carbonate to the brine to obtain mixed solution one; in the second step, the pH value of the mixed solution one is adjusted to 7 to 9 by using sodium hydroxide solution; the third step , add the required amount of degradable thickener to the mixed solution 1 obtained in the second step and stir until the degradable thickener is completely dissolved to obtain a mixed solution 2. The funnel viscosity of the mixed solution 2 is 40s to 60s to obtain an environmentally friendly Clay-free strong inhibiting drilling fluid.
下面是对上述发明技术方案之二的进一步优化或/和改进：The following is a further optimization or/and improvement of the second technical solution of the above-mentioned invention:
上述复合盐水为海水、咸水和卤水中的一种以上，并且复合盐水的密度为1.05g/cm3至1.50 g/cm3。The above-mentioned composite brine is one or more of seawater, salt water, and brine, and the composite brine has a density of 1.05 g/cm3 to 1.50 g/cm3 .
上述降解型增粘剂为黄原胶。The above-mentioned degradable tackifier is xanthan gum.
上述硅酸钠的模数为2.4至3.6，硅酸钠为工业级硅酸钠。The modulus of the above-mentioned sodium silicate is 2.4 to 3.6, and the sodium silicate is technical grade sodium silicate.
上述生石灰为工业级生石灰；或/和，氢氧化钠为工业级氢氧化钠。The above-mentioned quicklime is industrial-grade quicklime; or/and, the sodium hydroxide is technical-grade sodium hydroxide.
上述超细碳酸钙的细度为5um至10um。The fineness of the above-mentioned ultrafine calcium carbonate is 5um to 10um.
本发明所述的环保型无粘土强抑制钻井液兼具降解性和较强的抑制性，并且，本发明所述的环保型无粘土强抑制钻井液能够降低滤失量，另外，原料配方简单，原料来源丰富，相比于现有钻井液，生产本发明所述的环保型无粘土强抑制钻井液的成本更低；本发明所述的环保型无粘土强抑制钻井液适用于正常压力地层、长裸眼泥页岩井段钻井作业。The environment-friendly clay-free strong inhibitory drilling fluid of the present invention has both degradability and strong inhibitory properties, and the environment-friendly clay-free strong inhibitory drilling fluid of the present invention can reduce filtration loss, and in addition, the raw material formula is simple , the source of raw materials is rich, and compared with the existing drilling fluid, the cost of producing the environment-friendly clay-free strong inhibition drilling fluid of the present invention is lower; the environment-friendly clay-free strong inhibition drilling fluid of the present invention is suitable for normal pressure formations , Long open-hole mud shale drilling operations.
具体实施方式Detailed ways
本发明不受下述实施例的限制，可根据本发明的技术方案与实际情况来确定具体的实施方式。本发明中所提到各种化学试剂和化学用品如无特殊说明，均为现有技术中公知公用的化学试剂和化学用品；本发明中的百分数如没有特殊说明，均为质量百分数；本发明中的溶液若没有特殊说明，均为溶剂为水的水溶液，例如，盐酸溶液即为盐酸水溶液；本发明中的常温、室温一般指15℃到25℃的温度，一般定义为25℃。The present invention is not limited by the following examples, and specific implementations can be determined according to the technical solutions and actual conditions of the present invention. The various chemical reagents and chemical products mentioned in the present invention are all known and public chemical reagents and chemical products in the prior art unless otherwise specified; the percentages in the present invention are mass percentages unless otherwise specified; the present invention Unless otherwise specified, the solution in the solution is an aqueous solution in which the solvent is water. For example, a hydrochloric acid solution is an aqueous hydrochloric acid solution; the normal temperature and room temperature in the present invention generally refer to a temperature between 15°C and 25°C, which is generally defined as 25°C.
下面结合实施例对本发明作进一步描述：Below in conjunction with embodiment, the present invention is further described:
实施例1：该环保型无粘土强抑制钻井液按下述制备方法得到，原料包括复合盐水、降解型增粘剂、硅酸钠、生石灰和超细碳酸钙，原料按质量比计，复合盐水：降解型增粘剂：硅酸钠：生石灰：超细碳酸钙=100：0.3至1.0：3至5：0.5至1：2至3；制备方法如下：第一步，在搅拌状态下，向所需量的复合盐水中加入所需量的硅酸钠、生石灰和超细碳酸钙混合后得到混合液一；第二步中，采用氢氧化钠溶液将混合液一的pH值调节至7至9；第三步，向第二步得到的混合液一中加入所需量的降解型增粘剂搅拌至降解型增粘剂完全溶解后得到混合液二，混合液二的漏斗粘度为40s至60s后得到环保型无粘土强抑制钻井液。Example 1: The environment-friendly clay-free strong inhibition drilling fluid is obtained by the following preparation method. The raw materials include compound brine, degradable tackifier, sodium silicate, quicklime and ultrafine calcium carbonate. : Degradable thickener: sodium silicate: quicklime: superfine calcium carbonate = 100: 0.3 to 1.0: 3 to 5: 0.5 to 1: 2 to 3; the preparation method is as follows: the first step, under stirring The required amount of sodium silicate, quicklime and ultrafine calcium carbonate are added to the required amount of composite brine to obtain mixed solution one; in the second step, the pH value of the mixed solution one is adjusted to 7 to 9; In the third step, add the required amount of degradable tackifier to the mixed solution 1 obtained in the second step and stir until the degradable tackifier is completely dissolved to obtain a mixed solution 2, and the funnel viscosity of the mixed solution 2 is 40s to After 60s, an environment-friendly clay-free strong inhibition drilling fluid was obtained.
本实施例中，原料采用无毒环保的复合盐水、降解型增粘剂、硅酸钠、生石灰和超细碳酸钙，配方独特；在复合盐水中，既有钠、钾等一价离子，又有钙、镁等二价离子；向复合盐水中加入生石灰、硅酸钠，能够增加钙离子浓度和二价硅酸根，使本实施例得到的钻井液的抑制性得到强化，使之对泥页岩地层具有更好的抑制水化、膨胀及分散的作用，并且本实施例得到的钻井液中的硅酸钠、生石灰和氢氧化钠，能够形成硅酸钙溶胶和氢氧化钙胶体，加上超细碳酸钙后，使本实施例得到的钻井液中有足够胶体离子形成滤饼，从而能够降低滤失量；另外，本实施例中，原料配方简单，原料来源丰富，相比于现有钻井液，生产本实施例所述的环保型无粘土强抑制钻井液的成本更低；制备方法简便，无特殊操作。In this embodiment, the raw materials are non-toxic and environmentally friendly compound brine, degradable tackifier, sodium silicate, quicklime and ultrafine calcium carbonate, and the formula is unique; in compound brine, there are both monovalent ions such as sodium and potassium, and There are divalent ions such as calcium and magnesium; adding quicklime and sodium silicate to the composite brine can increase the concentration of calcium ions and divalent silicates, so that the inhibition of the drilling fluid obtained in this example is strengthened, so that it has a strong effect on mud sheets. The rock formation has better effects of inhibiting hydration, swelling and dispersion, and the sodium silicate, quicklime and sodium hydroxide in the drilling fluid obtained in this example can form calcium silicate sol and calcium hydroxide colloid, plus After superfine calcium carbonate, there are enough colloidal ions in the drilling fluid obtained in this example to form a filter cake, thereby reducing the amount of filtration; For the drilling fluid, the cost of producing the environment-friendly non-clay strongly inhibited drilling fluid described in this embodiment is lower; the preparation method is simple and no special operation is required.
实施例2：该环保型无粘土强抑制钻井液按下述制备方法得到，原料包括复合盐水、降解型增粘剂、硅酸钠、生石灰和超细碳酸钙，原料按质量比计，复合盐水：降解型增粘剂：硅酸钠：生石灰：超细碳酸钙=100：0.3或1.0：3或5：0.5或1：2或3；制备方法如下：第一步，在搅拌状态下，向所需量的复合盐水中加入所需量的硅酸钠、生石灰和超细碳酸钙混合后得到混合液一；第二步中，采用氢氧化钠溶液将混合液一的pH值调节至7或9；第三步，向第二步得到的混合液一中加入所需量的降解型增粘剂搅拌至降解型增粘剂完全溶解后得到混合液二，混合液二的漏斗粘度为40s或60s后得到环保型无粘土强抑制钻井液。Example 2: The environment-friendly clay-free strong inhibition drilling fluid is obtained by the following preparation method. The raw materials include compound brine, degradable tackifier, sodium silicate, quicklime and ultrafine calcium carbonate. : Degradable tackifier: sodium silicate: quicklime: superfine calcium carbonate = 100: 0.3 or 1.0: 3 or 5: 0.5 or 1: 2 or 3; the preparation method is as follows: the first step, under stirring The required amount of sodium silicate, quicklime and ultrafine calcium carbonate are added in the required amount of complex brine to obtain mixed solution one; in the second step, the pH value of the mixed solution one is adjusted to 7 or 9; In the third step, add the required amount of degradable tackifier to the mixed solution 1 obtained in the second step and stir until the degradable tackifier is completely dissolved to obtain a mixed solution 2, and the funnel viscosity of the mixed solution 2 is 40s or After 60s, an environment-friendly clay-free strong inhibition drilling fluid was obtained.
实施例3：该环保型无粘土强抑制钻井液按下述制备方法得到，原料包括复合盐水、降解型增粘剂、硅酸钠、生石灰和超细碳酸钙，原料按质量比计，复合盐水：降解型增粘剂：硅酸钠：生石灰：超细碳酸钙=100：0.3：5：0.5：3；制备方法如下：第一步，在搅拌状态下，向所需量的复合盐水中加入所需量的硅酸钠、生石灰和超细碳酸钙混合后得到混合液一；第二步中，采用氢氧化钠溶液将混合液一的pH值调节至9；第三步，向第二步得到的混合液一中加入所需量的降解型增粘剂搅拌至降解型增粘剂完全溶解后得到混合液二，混合液二的漏斗粘度为40s后得到环保型无粘土强抑制钻井液。Example 3: The environment-friendly clay-free strong inhibition drilling fluid is obtained by the following preparation method. The raw materials include compound brine, degradable tackifier, sodium silicate, quicklime and ultrafine calcium carbonate. : Degradable thickener: sodium silicate: quicklime: superfine calcium carbonate = 100: 0.3: 5: 0.5: 3; the preparation method is as follows: the first step, under stirring, add the required amount of compound brine The required amount of sodium silicate, quicklime and ultrafine calcium carbonate are mixed to obtain mixed solution one; in the second step, the pH value of the mixed solution one is adjusted to 9 by using sodium hydroxide solution; in the third step, to the second step A required amount of degradable tackifier is added to the obtained mixed solution 1 and stirred until the degradable tackifier is completely dissolved to obtain a mixed solution 2. After the funnel viscosity of the mixed solution 2 is 40s, an environment-friendly clay-free strong inhibition drilling fluid is obtained.
实施例4：该环保型无粘土强抑制钻井液按下述制备方法得到，原料包括复合盐水、降解型增粘剂、硅酸钠、生石灰和超细碳酸钙，原料按质量比计，复合盐水：降解型增粘剂：硅酸钠：生石灰：超细碳酸钙=100：1.0：3：1：2；制备方法如下：第一步，在搅拌状态下，向所需量的复合盐水中加入所需量的硅酸钠、生石灰和超细碳酸钙混合后得到混合液一；第二步中，采用氢氧化钠溶液将混合液一的pH值调节至7；第三步，向第二步得到的混合液一中加入所需量的降解型增粘剂搅拌至降解型增粘剂完全溶解后得到混合液二，混合液二的漏斗粘度为60s后得到环保型无粘土强抑制钻井液。Embodiment 4: The environment-friendly clay-free strong inhibition drilling fluid is obtained by the following preparation method. The raw materials include compound brine, degradable tackifier, sodium silicate, quicklime and ultrafine calcium carbonate. : Degradable thickener: sodium silicate: quicklime: superfine calcium carbonate = 100: 1.0: 3: 1: 2; the preparation method is as follows: the first step, under stirring, add the required amount of complex brine The required amount of sodium silicate, quicklime and ultrafine calcium carbonate are mixed to obtain mixed solution one; in the second step, the pH value of the mixed solution one is adjusted to 7 by using sodium hydroxide solution; in the third step, to the second step The required amount of degradable tackifier is added to the obtained mixed solution 1 and stirred until the degradable tackifier is completely dissolved to obtain a mixed solution 2. After the funnel viscosity of the mixed solution 2 is 60s, an environment-friendly clay-free strong inhibition drilling fluid is obtained.
实施例5：作为上述实施例的优化，复合盐水为海水、咸水和卤水中的一种以上，并且复合盐水的密度为1.05g/cm3至1.50 g/cm3。Embodiment 5: As an optimization of the above embodiment, the composite brine is one or more of seawater, salt water and brine, and the density of the composite brine is 1.05 g/cm3 to 1.50 g/cm3 .
复合盐水还可以采用其它高矿化度地层水。Compound brine can also use other high salinity formation water.
实施例6：作为上述实施例的优化，降解型增粘剂为黄原胶。Embodiment 6: As an optimization of the above embodiment, the degradable tackifier is xanthan gum.
本发明中，唯一一种有机物黄原胶能够无毒可降解；黄原胶具有增粘提切的特点，提供悬浮携带能力。In the present invention, the only organic xanthan gum can be non-toxic and degradable; the xanthan gum has the characteristics of increasing viscosity and cutting, and provides suspension and carrying capacity.
实施例7：作为上述实施例的优化，硅酸钠的模数为2.4至3.6，硅酸钠为工业级硅酸钠。Embodiment 7: As an optimization of the above embodiment, the modulus of sodium silicate is 2.4 to 3.6, and the sodium silicate is technical grade sodium silicate.
实施例8：作为上述实施例的优化，生石灰为工业级生石灰；或/和，氢氧化钠为工业级氢氧化钠。Embodiment 8: As an optimization of the above embodiment, the quicklime is industrial grade quicklime; or/and, the sodium hydroxide is technical grade sodium hydroxide.
实施例9：作为上述实施例的优化，超细碳酸钙的细度为5um至10um。Embodiment 9: As the optimization of the above-mentioned embodiment, the fineness of ultrafine calcium carbonate is 5um to 10um.
实施例10:该环保型无粘土强抑制钻井液，原料为咸水100克（密度1.15g/cm3）+硅酸钠5克+生石灰1克+超细碳酸钙2克+氢氧化钠0.1克+黄原胶0.5克，制备方法同实施例4。Embodiment 10: this environment-friendly clay-free strong inhibition drilling fluid, the raw material is 100 grams of salt water (density 1.15g/cm3 )+5 grams of sodium silicate+1 gram of quicklime+2 grams of superfine calcium carbonate+0.1 gram of sodium hydroxide g + xanthan gum 0.5 g, the preparation method is the same as that in Example 4.
实施例11:该环保型无粘土强抑制钻井液，原料为地层盐水100克（咸水，密度1.30g/cm3）+硅酸钠3克+生石灰0.5克+超细碳酸钙3克+黄原胶0.7克，制备方法同实施例4。Embodiment 11: this environment-friendly clay-free strong inhibition drilling fluid, the raw material is 100 grams of formation brine (salt water, density 1.30g/cm3 )+3 grams of sodium silicate+0.5 grams of quicklime+3 grams of superfine calcium carbonate+yellow 0.7 g of original glue, the preparation method is the same as that of Example 4.
实施例12：该环保型无粘土强抑制钻井液，原料为卤水100克（盐卤，密度1.50g/cm3）+硅酸钠4克+生石灰0.6克+超细碳酸钙3克+黄原胶0.7克，制备方法同实施例3。Example 12: The environment-friendly clay-free strong inhibition drilling fluid, the raw material is 100 grams of brine (salt brine, density 1.50g/cm3 ) + 4 grams of sodium silicate + 0.6 grams of quicklime + 3 grams of superfine calcium carbonate + xanthan gum 0.7 g, the preparation method is the same as that in Example 3.
对于常规钻井液，钻井液性能要求为：密度1.05g/cm3～1.50 g/cm3，漏斗粘度40s至60s，滤失量≤10mL，抑制性（钻井液+15%膨润土，100℃滚动16h后表观粘度上升率≤10%）；降解性能评定指标为：生物毒性检测（EC50≥25000mg/L），可降解性（BOD5/CODCr≥0.15）。For conventional drilling fluid, the performance requirements of drilling fluid are: density 1.05g/cm3 ~ 1.50 g/cm3 , funnel viscosity 40s to 60s, filtration loss ≤10mL, inhibition (drilling fluid + 15% bentonite, rolling at 100℃ for 16h) The apparent viscosity increase rate is less than or equal to 10%); the degradation performance evaluation indicators are: biological toxicity test (EC50≥25000mg/L), degradability (BOD5 /CODCr ≥0.15).
本发明上述实施例1、实施例10至实施例12所述的钻井液的主要技术指标（钻井液性能要求、降解性能）测试结果如表1所示。Table 1 shows the test results of the main technical indicators (drilling fluid performance requirements, degradation performance) of the drilling fluids described in the above-mentioned Example 1 and Example 10 to Example 12 of the present invention.
从表1可以看出，本发明上述实施例1、实施例10至实施例12所述的钻井液不仅达到了常规钻井液的钻井液性能要求，而且通过表观粘度上升率数据可以看出，本发明上述实施例1、实施例10至实施例12所述的钻井液具有较强的抑制性；还具有较好的降解性能。As can be seen from Table 1, the drilling fluids described in Example 1 and Example 10 to Example 12 of the present invention not only meet the drilling fluid performance requirements of conventional drilling fluids, but also can be seen from the apparent viscosity rise rate data, The drilling fluids described in the above Embodiment 1 and Embodiment 10 to Embodiment 12 of the present invention have strong inhibitory properties, and also have good degradation performance.
综上所述，本发明所述的环保型无粘土强抑制钻井液兼具降解性和较强的抑制性，并且，本发明所述的环保型无粘土强抑制钻井液能够降低滤失量，另外，原料配方简单，原料来源丰富，相比于现有钻井液，生产本发明所述的环保型无粘土强抑制钻井液的成本更低；本发明所述的环保型无粘土强抑制钻井液适用于正常压力地层、长裸眼泥页岩井段钻井作业。To sum up, the environment-friendly clay-free strong inhibition drilling fluid of the present invention has both degradability and strong inhibition, and the environment-friendly clay-free strong inhibition drilling fluid of the present invention can reduce filtration loss, In addition, the raw material formula is simple and the source of raw materials is abundant. Compared with the existing drilling fluid, the cost of producing the environment-friendly clay-free strong inhibition drilling fluid of the present invention is lower; the environment-friendly clay-free strong inhibition drilling fluid of the present invention is It is suitable for drilling operations in normal pressure formations and long open-hole mud shale wells.
以上技术特征构成了本发明的实施例，其具有较强的适应性和实施效果，可根据实际需要增减非必要的技术特征，来满足不同情况的需求。The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effects, and unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.
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