阅读说明：本技术 一种钾胺基聚磺钻井液处理方法 (Method for treating potassium amino polysulfonate drilling fluid ) 是由 宋晓勇 于 2021-10-14 设计创作，主要内容包括：本发明公开了一种钾胺基聚磺钻井液处理方法,涉及钻井液技术领域,包括以下步骤：(1)、地质概况研究：钻井液处理前首先对钻井位置的钻井深度以及钻井位置的地质情况进行研究,根据钻井深度和地质情况的区别,针对性配制钾胺基聚磺钻井液的钻井液配方,该钾胺基聚磺钻井液配方具体包括：配方一、配方二、配方三和配方四；(2)、钾胺基聚磺钻井液配制；(3)、钾胺基聚磺钻井液施工。该钾胺基聚磺钻井液处理方法,适用于中生界、古生界地层石油钻井,在配制时钻井液处理剂加料顺序为:降失水剂、30％包被剂、抑制剂、70％包被剂,该加料顺序粒径分布较宽,有利于黏土颗粒的有效堆积从而形成致密滤饼,滤失造壁性能与流变性能均较好。(The invention discloses a method for treating potassium amino polysulfonate drilling fluid, which relates to the technical field of drilling fluid and comprises the following steps: (1) and geological profile research: before the drilling fluid is treated, firstly, the drilling depth of a drilling position and the geological condition of the drilling position are researched, and according to the difference between the drilling depth and the geological condition, a drilling fluid formula of the potassium amino polysulfonate drilling fluid is prepared in a targeted manner, wherein the potassium amino polysulfonate drilling fluid formula specifically comprises the following components: formula one, formula two, formula three and formula four; (2) preparing potassium amino polysulfonate drilling fluid; (3) and constructing the potassium amino polysulfonate drilling fluid. The potassium amino polysulfonate drilling fluid treatment method is suitable for petroleum drilling of stratums of Zhongsheng and Gusheng, the drilling fluid treatment agent is prepared by a fluid loss agent, 30% of coating agent, an inhibitor and 70% of coating agent in the sequence, the particle size distribution of the feeding sequence is wide, clay particles are effectively stacked to form a compact filter cake, and the fluid loss wall-building performance and the rheological performance are good.)

1. A potassium amino polysulfonate drilling fluid treatment method is characterized by comprising the following steps:

(1) geological profile study

Before the drilling fluid is treated, firstly, the drilling depth of a drilling position and the geological condition of the drilling position are researched, and according to the difference between the drilling depth and the geological condition, a drilling fluid formula of the potassium amino polysulfonate drilling fluid is prepared in a targeted manner, wherein the potassium amino polysulfonate drilling fluid formula specifically comprises the following components: formula one, formula two, formula three and formula four;

(2) preparation of potassium amino polysulfonate drilling fluid

Firstly, adding bentonite slurry into a preparation container as base slurry, sequentially adding a fluid loss additive, a 30% coating agent, an inhibitor and a 70% coating agent, adding the next treating agent after one treating agent is uniformly stirred, continuously stirring and mixing while adding materials, and fully mixing after adding materials to obtain a finished product of the potassium amino polysulfonamide drilling fluid;

(3) construction of potassium amino polysulfonate drilling fluid

The equipment is debugged before drilling, different drilling modes are realized according to drilling geology and well depth structures, and the performance of the drilling fluid is maintained in time in the drilling process.

2. The method as claimed in claim 1, wherein the fluid loss additive specifically comprises lignite resin, vinyl fluid loss additive, industrial product, etc., the inhibitor specifically comprises potassium chloride, organic salt Weigh2, polyamine SIAT, industrial product, etc., and the coating agent specifically comprises zwitterionic polymer, industrial product, etc.; the other treating agent specifically comprises calcium oxide, potassium hydroxide, anhydrous sodium carbonate and the like.

3. The method for treating the potassium amino polysulfonic drilling fluid as claimed in claim 1, wherein the formula one of the potassium amino polysulfonic drilling fluid is prepared according to the following proportion: 3.5-4.5% of bentonite slurry, 0.2-0.5% of polyacrylamide potassium salt, 0.5-2% of fast drilling agent, 0.3-0.5% of polyamine, 2-3% of NPAN, 0.5-1.0% of filtrate loss reducer and 1-2% of plugging agent, and part of additives can be properly added.

4. The method for treating the potassium amino polysulfonic drilling fluid as claimed in claim 1, wherein the formula II of the potassium amino polysulfonic drilling fluid is prepared according to the following proportion: 3-4% of bentonite slurry, 0.3-0.5% of polyacrylamide potassium salt, 0.5-1% of fast drilling agent, 0.5-1% of polyamine, 2-3% of a filtrate reducer composite ammonium salt, 0.5-1.0% of a polymer filtrate reducer, 2-3% of phenolic resin, 2-3% of lignite resin, 1-2% of sulfonated lignite, 2-3% of a plugging agent and 3-5% of potassium chloride, and part of additives can be properly added.

5. The method for treating the potassium amino polysulfonate drilling fluid as claimed in claim 1, wherein the additives of the first formula and the second formula of the potassium amino polysulfonate drilling fluid are specifically: superfine calcium carbonate, organic silanol inhibitor, shielding temporary plugging agent, high-quality asphalt plugging agent and the like.

6. The method for treating the potassium amino polysulfonic drilling fluid as claimed in claim 1, wherein the formula III of the potassium amino polysulfonic drilling fluid is prepared according to the following proportion: 3 to 3.5 percent of bentonite slurry, 0.1 to 0.3 percent of coating agent, 0.5 to 1 percent of polyanionic cellulose, 0.3 to 0.5 percent of polyamine inhibitor, 2 to 3 percent of superfine calcium carbonate, 2 to 4 percent of high-temperature collapse-resisting agent, 2 to 4 percent of sulfonated phenolic resin, 2 to 4 percent of lignite resin, 3 to 5 percent of potassium chloride, 1 to 2 percent of nano-micron plugging agent and 0.5 to 1.0 percent of fast drilling agent, and partial additives can be properly added.

7. The method for treating the potassium amino polysulfonic drilling fluid as claimed in claim 1, wherein the formula four of the potassium amino polysulfonic drilling fluid is prepared according to the following proportion: 3-3.5% of bentonite slurry, 0.1-0.3% of coating agent, 0.5-1% of polyanionic cellulose, 7-10% of potassium chloride, 0.5-1.0% of polyamine inhibitor, 2-4% of sulfonated phenolic resin, 2-4% of lignite resin, 1-2% of sulfonate copolymer fluid loss additive, 2-3% of cationic asphalt latex, 2-3% of sulfonated asphalt or natural asphalt powder, 3-5% of superfine calcium carbonate and 1-2% of micro-nano plugging agent, and part of additives can be properly added.

8. The method for treating the potassium amino polysulfonate drilling fluid as claimed in claim 1, wherein the additives of formula three and formula four of the potassium amino polysulfonate drilling fluid are specifically: asphalt anti-collapse agent, polymer fluid loss agent, shielding temporary plugging agent, non-penetrating agent and the like.

9. The method for treating the potassium amino polysulfonic drilling fluid in claim 1, wherein the potassium amino polysulfonic drilling fluid is suitable for petroleum drilling in middle and ancient China formations.

Technical Field

The invention relates to the technical field of drilling fluid, in particular to a method for treating potassium amino polysulfonate drilling fluid.

Background

The drilling fluid is also called mud and flushing fluid, is an essential circulating medium in drilling construction, and is the blood of drilling. Drilling fluids can be divided by composition into clear water slurries, water-based muds, non-water-based muds (commonly referred to as oil-based muds), and gas drilling fluids, among others.

In the existing drilling fluid treatment method, the quality influence of the feeding sequence on a finished product is not emphasized when the drilling fluid is fed, the system particle size of the inhibitor-added drilling fluid system is too large, a compact filter cake is not easily formed, and the filtration loss wall building performance is poor; the system particle size of the drilling fluid system added with the coating agent is larger, the system particle size of the drilling fluid system added with the coating agent is smaller, the filtration wall building performance is poorer, and an adaptive drilling fluid treatment method cannot be provided for different drilling depths and geology, so that a potassium amino polysulfonate drilling fluid treatment method is provided.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a method for treating potassium amino polysulfonate drilling fluid, which solves the problems in the background art.

In order to achieve the purpose, the invention is realized by the following technical scheme, and the potassium amino polysulfonate drilling fluid treatment method comprises the following steps:

(1) geological profile study

Before the drilling fluid is treated, the drilling depth of a drilling position and the geological condition of the drilling position are firstly researched, and the drilling fluid formula of the potassium amino polysulfonate drilling fluid is specifically configured according to the difference between the drilling depth and the geological condition, wherein the potassium amino polysulfonate drilling fluid formula specifically comprises the following components: formula one, formula two, formula three and formula four;

(2) preparation of potassium amino polysulfonate drilling fluid

Firstly, adding bentonite slurry into a preparation container as base slurry, sequentially adding a fluid loss additive, a 30% coating agent, an inhibitor and a 70% coating agent, adding the next treating agent after one treating agent is uniformly stirred, continuously stirring and mixing while adding materials, and fully mixing after adding materials to obtain a finished product of the potassium amino polysulfonamide drilling fluid;

(3) construction of potassium amino polysulfonate drilling fluid

The equipment is debugged before drilling, different drilling modes are realized according to drilling geology and well depth structures, and the performance of the drilling fluid is maintained in time in the drilling process.

Optionally, the fluid loss agent specifically comprises lignite resin, a vinyl fluid loss agent, an industrial product and the like, the inhibitor specifically comprises potassium chloride, organic salt Weigh2, polyamine SIAT, an industrial product and the like, and the coating agent specifically comprises a zwitterionic polymer, an industrial product and the like; the other treating agent specifically comprises calcium oxide, potassium hydroxide, anhydrous sodium carbonate and the like.

Optionally, the formulation one of the potassium amino polysulfonate drilling fluid is as follows: 3.5-4.5% of bentonite slurry, 0.2-0.5% of polyacrylamide potassium salt, 0.5-2% of fast drilling agent, 0.3-0.5% of polyamine, 2-3% of NPAN, 0.5-1.0% of filtrate loss reducer and 1-2% of plugging agent, and part of additives can be properly added.

Optionally, the formula II of the potassium amino polysulfonate drilling fluid is prepared according to the following proportion: 3-4% of bentonite slurry, 0.3-0.5% of polyacrylamide potassium salt, 0.5-1% of fast drilling agent, 0.5-1% of polyamine, 2-3% of a filtrate reducer composite ammonium salt, 0.5-1.0% of a polymer filtrate reducer, 2-3% of phenolic resin, 2-3% of lignite resin, 1-2% of sulfonated lignite, 2-3% of a plugging agent and 3-5% of potassium chloride, and part of additives can be properly added.

Optionally, the additives of the first formula and the second formula of the potassium amino polysulfonate drilling fluid are specifically: superfine calcium carbonate, organic silanol inhibitor, shielding temporary plugging agent, high-quality asphalt plugging agent and the like.

Optionally, the formula three of the potassium amino polysulfonate drilling fluid is prepared according to the following proportion: 3 to 3.5 percent of bentonite slurry, 0.1 to 0.3 percent of coating agent, 0.5 to 1 percent of polyanionic cellulose, 0.3 to 0.5 percent of polyamine inhibitor, 2 to 3 percent of superfine calcium carbonate, 2 to 4 percent of high-temperature collapse-resisting agent, 2 to 4 percent of sulfonated phenolic resin, 2 to 4 percent of lignite resin, 3 to 5 percent of potassium chloride, 1 to 2 percent of nano-micron plugging agent and 0.5 to 1.0 percent of fast drilling agent, and partial additives can be properly added.

Optionally, the formula four of the potassium amino polysulfonate drilling fluid is prepared according to the following proportion: 3-3.5% of bentonite slurry, 0.1-0.3% of coating agent, 0.5-1% of polyanionic cellulose, 7-10% of potassium chloride, 0.5-1.0% of polyamine inhibitor, 2-4% of sulfonated phenolic resin, 2-4% of lignite resin, 1-2% of sulfonate copolymer fluid loss additive, 2-3% of cationic asphalt latex, 2-3% of sulfonated asphalt or natural asphalt powder, 3-5% of superfine calcium carbonate and 1-2% of micro-nano plugging agent, and part of additives can be properly added.

Optionally, the additives of the formula three and the formula four of the potassium amino polysulfonate drilling fluid are specifically: asphalt anti-collapse agent, polymer fluid loss agent, shielding temporary plugging agent, non-penetrating agent and the like.

Optionally, the potassium amino polysulfonate drilling fluid is suitable for petroleum drilling of stratums of the middle and ancient communities.

The invention provides a method for treating potassium amino polysulfonate drilling fluid, which has the following beneficial effects:

the potassium amino polysulfonate drilling fluid treatment method is suitable for petroleum drilling of stratums of the middle and ancient communities, the drilling fluid treatment agent is prepared by adding a water loss reducer, a 30% coating agent, an inhibitor and a 70% coating agent in sequence, and analyzing the action mechanism of influencing the performance of the drilling fluid by different adding sequences by using a laser scattering particle size analyzer, the result shows that the particle size distribution of the adding sequence is wide, is between several micrometers and more than one thousand micrometers, is in multimodal distribution, is beneficial to the effective accumulation of clay particles so as to form a compact filter cake, and has good filtration wall building performance and rheological performance;

according to the potassium amino polysulfonate drilling fluid treatment method, in the preparation process, the selected material proportion can greatly improve the anti-collapse performance of the drilling fluid, the coating agent with strong inhibition performance is selected to be compatible with the filtrate reducer, the inhibition performance of a drilling fluid system can be enhanced, the filtrate loss can be reduced, the stability of a well wall and the well diameter regulation can be ensured, and the coating agent of a high-quality macromolecular polymer is adopted, so that the coating inhibition performance of the drilling fluid can be enhanced, the requirement of rapid drilling and rock carrying of an upper stratum can be met, the plugging performance of the drilling fluid can be enhanced, and the problems of collapse and leakage of the same layer caused by the leakage of a sandstone stratum can be reduced;

according to the potassium amino polysulfonate drilling fluid treatment method, in the preparation process, along with the increase of the well depth and the increase of the well temperature, the proportioning system has strong anti-collapse property and temperature resistance, can fully ensure the anti-hydration, plugging and anti-collapse properties of the drilling fluid, has good mud cake quality, can ensure the stability of the wall of a mudstone stratum well and the sticking and blocking of a sandstone stratum, and can effectively inhibit the hydration, expansion and stripping of clay and plug micro cracks by adopting the plugging inhibition capability of the system, such as potassium chloride, polyamine, potassium polyacrylate, a nano-micron plugging agent, a high-temperature anti-collapse agent and the like.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to specific embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

A potassium amino polysulfonate drilling fluid treatment method comprises the following steps:

(1) geological profile study

Before the drilling fluid is treated, the drilling depth of a drilling position and the geological condition of the drilling position are firstly researched, and the drilling fluid formula of the potassium amino polysulfonate drilling fluid is specifically configured according to the difference between the drilling depth and the geological condition, wherein the potassium amino polysulfonate drilling fluid formula specifically comprises the following components: formula one, formula two, formula three and formula four;

(2) preparation of potassium amino polysulfonate drilling fluid

Firstly, adding bentonite slurry into a preparation container as base slurry, sequentially adding a fluid loss additive, a 30% coating agent, an inhibitor and a 70% coating agent, adding the next treating agent after one treating agent is uniformly stirred, continuously stirring and mixing while adding materials, and fully mixing after adding materials to obtain a finished product of the potassium amino polysulfonamide drilling fluid;

(3) construction of potassium amino polysulfonate drilling fluid

The equipment is debugged before drilling, different drilling modes are realized according to drilling geology and well depth structures, and the performance of the drilling fluid is maintained in time in the drilling process.

The fluid loss agent specifically comprises lignite resin, a vinyl fluid loss agent, industrial products and the like, the inhibitor specifically comprises potassium chloride, organic salt Weigh2, polyamine SIAT, industrial products and the like, and the coating agent specifically comprises a zwitterionic polymer, industrial products and the like; other treating agents include calcium oxide, potassium hydroxide, anhydrous sodium carbonate, and the like.

The preparation proportion of the potassium amino polysulfonate drilling fluid is as follows: 3.5-4.5% of bentonite slurry, 0.2-0.5% of polyacrylamide potassium salt, 0.5-2% of fast drilling agent, 0.3-0.5% of polyamine, 2-3% of NPAN, 0.5-1.0% of filtrate loss reducer and 1-2% of plugging agent, and part of additives can be properly added.

The formula II of the potassium amino polysulfonate drilling fluid is prepared according to the following proportion: 3-4% of bentonite slurry, 0.3-0.5% of polyacrylamide potassium salt, 0.5-1% of fast drilling agent, 0.5-1% of polyamine, 2-3% of a filtrate reducer composite ammonium salt, 0.5-1.0% of a polymer filtrate reducer, 2-3% of phenolic resin, 2-3% of lignite resin, 1-2% of sulfonated lignite, 2-3% of a plugging agent and 3-5% of potassium chloride, and part of additives can be properly added.

The formula III of the potassium amino polysulfonate drilling fluid comprises the following components in proportion: 3 to 3.5 percent of bentonite slurry, 0.1 to 0.3 percent of coating agent, 0.5 to 1 percent of polyanionic cellulose, 0.3 to 0.5 percent of polyamine inhibitor, 2 to 3 percent of superfine calcium carbonate, 2 to 4 percent of high-temperature collapse-resisting agent, 2 to 4 percent of sulfonated phenolic resin, 2 to 4 percent of lignite resin, 3 to 5 percent of potassium chloride, 1 to 2 percent of nano-micron plugging agent and 0.5 to 1.0 percent of fast drilling agent, and partial additives can be properly added.

The formula IV of the potassium amino polysulfonate drilling fluid comprises the following components in proportion: 3-3.5% of bentonite slurry, 0.1-0.3% of coating agent, 0.5-1% of polyanionic cellulose, 7-10% of potassium chloride, 0.5-1.0% of polyamine inhibitor, 2-4% of sulfonated phenolic resin, 2-4% of lignite resin, 1-2% of sulfonate copolymer fluid loss additive, 2-3% of cationic asphalt latex, 2-3% of sulfonated asphalt or natural asphalt powder, 3-5% of superfine calcium carbonate and 1-2% of micro-nano plugging agent, and part of additives can be properly added.

The additives of the first formula and the second formula of the potassium amino polysulfonate drilling fluid are specifically as follows: superfine calcium carbonate, organic silanol inhibitor, shielding temporary plugging agent, high-quality asphalt plugging agent and the like; the additive of the formula III and the formula IV of the potassium amino polysulfonate drilling fluid is specifically as follows: asphalt anti-collapse agent, polymer fluid loss agent, shielding temporary plugging agent, non-penetrating treatment agent and the like; the potassium amino polysulfonate drilling fluid is suitable for petroleum drilling of stratums of China and ancient China.

The first embodiment is as follows:

(1) geological profile study

The depth of a well drilling section is 1000-5213 m, recent, ancient, chalky, three-fold and two-fold igneous rock strata are mainly drilled, the ancient, chalky and dwarfin sandstone are varied in thickness, the lithology of the three-fold stratum is mainly mudstone, the lower part of a kotul group develops sandstone, and the two-fold igneous rock section develops basalt, English andesite and tuff and mudstone in geological prediction;

(2) preparation of potassium amino polysulfonate drilling fluid

Preparing drilling fluid at a well section of 1000-3500m according to the preparation proportion of 3.5-4.5 percent of bentonite slurry, 0.2-0.5 percent of polyacrylamide potassium salt, 0.5-2 percent of fast drilling agent, 0.3-0.5 percent of polyamine, 2-3 percent of NPAN, 0.5-1.0 percent of filtrate reducer and 1-2 percent of plugging agent;

3500-plus-5213-m well section is prepared by drilling fluid according to the preparation proportion of 3-4 percent of bentonite slurry, 0.3-0.5 percent of polyacrylamide potassium salt, 0.5-1 percent of fast drilling agent, 0.5-1 percent of polyamine, 2-3 percent of fluid loss additive composite ammonium salt, 0.5-1.0 percent of polymer fluid loss additive, 2-3 percent of phenolic resin, 2-3 percent of lignite resin, 1-2 percent of sulfonated lignite, 2-3 percent of plugging agent and 3-5 percent of potassium chloride;

(3) construction of potassium amino polysulfonate drilling fluid

Replenishing glue solution and adjusting the performance of the drilling fluid before drilling, and replenishing HV-CMC and polymer glue solution in time after drilling to maintain the circulation volume of the drilling fluid and the necessary performance of the drilling fluid;

the drilling speed of the chalk system and above strata is higher, 5-10kg/m of stratum is added in the stratum in the section³The fast drilling agent improves the lubricating and anti-balling capacity of the drilling fluid and the auxiliary rock breaking capacity;

before the three-cascade system, a drilling fluid system is gradually converted into a polysulfonate anti-collapse system, 3 percent of SMP-2, SPNH, KJ series and other sulfonation treatment agents can be added into glue solution, and the gradually conversion is carried out in a mode of compounding 0.2 to 0.4 percent of small molecular polymer, so that the drilling fluid system is completely converted into the polysulfonate anti-collapse system before entering the three-cascade system;

after the drilling fluid enters the triple-stack, KCl is added into the drilling fluid, the system is converted into KCL-potassium amino polysulfonamide, the safe density window of the drilling fluid is widened, the drilling fluid enters the formation which is easy to leak and is in the double-stack system with lower drilling fluid density, 0.3-0.5% of polyamine is compounded, and the inhibition capability of the system is ensured.

The second embodiment is as follows:

(1) geological profile study

The depth of the well drilling section is 5213-7650 m, when the drilling tool mainly encounters a Sanjia charcoal system, a Shizu system and an Ordovician Santana wood group, mudstone is relatively developed and easy to hydrate and expand, and the mudpan system, the Shizu system and the Ordovician Santana wood group develop into layered sandstone, and a Liangzi lattice group and a Qialback group are developed into argillaceous limestone, gray mudstone and argillaceous marlite;

(2) preparation of potassium amino polysulfonate drilling fluid

5213-7650 m well section, preparing a drilling fluid according to the preparation proportion of 3-3.5% of bentonite slurry, 0.1-0.3% of coating agent, 0.5-1% of polyanionic cellulose, 0.3-0.5% of polyamine inhibitor, 2-3% of superfine calcium carbonate, 2-4% of high-temperature collapse resistant agent, 2-4% of sulfonated phenolic resin, 2-4% of lignite resin, 3-5% of potassium chloride, 1-2% of nano-micron plugging agent and 0.5-1.0% of fast drilling agent;

(3) construction of potassium amino polysulfonate drilling fluid

Before drilling, a proper amount of Na can be added according to the field condition₂CO₃The pretreatment is carried out, and after the plug is drilled, the mud is polluted by the cement, and the sectional circulation is noticed, so that the complexity is avoided;

the potassium amino polysulfonate anti-sloughing drilling fluid system is used, and a sulfonation treating agent, potassium chloride and a macromolecular polymer are properly supplemented, so that the performance of the drilling fluid is stable, and the KCl concentration in the well slurry is kept at 30kg/m³Polyamine inhibitor concentration of not less than 5kg/m³(ii) a And timely supplement 2-3kg/m³Polymer coating agent, 20-40kg/m³High temperature resistant anti-collapse agent and 20-40kg/m³The temperature-resistant filtrate reducer is supplemented with plugging materials such as asphalt, QS-2 and the like, so that the drilling fluid is ensured to have good anti-collapse plugging performance;

when the drilling is in contact with the non-integrated interface of the mud basin system and the left-handed system tower cell group, the reasonable drilling fluid density is carefully controlled when the left-handed system tower cell group and the kokstan cell group drill, and the drilling-while-drilling plugging of the drilling fluid is enhanced. During drilling, 20-30kg/m can be added³The high-efficiency plugging agent while drilling prevents well leakage;

along with the increase of the well depth, high-temperature resistant fluid loss additive sulfomethyl phenolic resin and the like are timely supplemented to ensure that the concentration of the fluid loss additive is not lower than 30kg/m³In combination with 5-10kg/m³The flow pattern of the silicon-fluorine viscosity reducer is adjusted, and the content of bentonite is controlled to be 35kg/m³And the high-temperature thickening or high-temperature dilution is prevented, and the high-temperature stability of the drilling fluid system is ensured.

The third concrete embodiment:

(1) geological profile study

The depth of a well section of a well is 5928-7275m, the main drilling meets stratums of Ordovician dell-Cock group and Chilback group, and the main lithology is as follows: gray mudstone, diabase, tan gray mudstone, yellow gray argillaceous limestone;

(2) preparation of potassium amino polysulfonate drilling fluid

5928 7275m well section, preparing drilling fluid according to the proportion of 3-3.5% bentonite slurry, 0.1-0.3% coating agent, 0.5-1% polyanionic cellulose, 7-10% potassium chloride, 0.5-1.0% polyamine inhibitor, 2-4% sulfonated phenolic resin, 2-4% lignite resin, 1-2% sulfonate copolymer fluid loss additive, 2-3% cationic asphalt latex, 2-3% sulfonated asphalt or natural asphalt powder, 3-5% superfine calcium carbonate and 1-2% micro-nano plugging agent;

(3) construction of potassium amino polysulfonate drilling fluid

Storing sufficient heavy slurry on site, entering 50-100 m before an invader, gradually adding a physical-chemical coupling anti-collapse material according to design requirements, adjusting the viscosity of the drilling fluid, improving the rock carrying capacity of the drilling fluid, improving the suspension performance of the drilling fluid, controlling the HTHP filtration loss (130 ℃/150 ℃) of the drilling fluid to be less than or equal to 10mL, reducing the permeation of filtrate to the stratum, and improving the stability of a borehole;

when a potassium amino polysulfonate anti-collapse drilling fluid system is used in drilling, mudstone is easy to hydrate and expand to cause erosion and block falling, the capability of inhibiting hydration expansion and hydration dispersion of the drilling fluid needs to be improved, 7-10% of KCL (the system inhibition is improved by matching with 0.5-1.0% of polyamine inhibitor; 3-5% of QS, 3-5% of asphalts and 2-3% of PB-1 are supplemented to improve the system plugging property; and the filtration loss and the high-temperature stability of the drilling fluid are controlled by using sulfonated phenolic resin, lignite resin, sulfonate copolymer filtrate reducer, low-viscosity polyanionic cellulose and the like;

after the well is drilled to 6200m, 1.5% of a well wall reinforcer 1 type + 1.5% of a well wall reinforcer 2 type + 1-2% of a flexible plugging anti-collapse agent + 1-2% of a flexible nano plugging agent + 1-2% of a chemical wall-fixing agent are gradually supplemented in the well slurry, and meanwhile, the API (application program interface) filtration loss is controlled to be less than or equal to 4mL, and the HTHP filtration loss is controlled to be less than or equal to 10mL, so that the penetration of filtrate into the stratum is reduced, and the risk of well wall instability is reduced.

In conclusion, the potassium amino polysulfonate drilling fluid treatment method comprises the following specific steps when in use:

before the drilling fluid is treated, the drilling depth of a drilling position and the geological condition of the drilling position are firstly researched, and the drilling fluid formula of the potassium amino polysulfonate drilling fluid is specifically configured according to the difference between the drilling depth and the geological condition, wherein the potassium amino polysulfonate drilling fluid formula specifically comprises the following components: formula one, formula two, formula three and formula four; firstly, adding bentonite slurry into a preparation container as base slurry, sequentially adding a fluid loss additive, a 30% coating agent, an inhibitor and a 70% coating agent, adding the next treating agent after one treating agent is uniformly stirred, continuously stirring and mixing while adding materials, and fully mixing after adding materials to obtain a finished product of the potassium amino polysulfonamide drilling fluid; the potassium amino polysulfonate drilling fluid is suitable for petroleum drilling of stratums of the middle and ancient communities; the equipment is debugged before drilling, different drilling modes are realized according to drilling geology and well depth structures, and the performance of the drilling fluid is maintained in time in the drilling process.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.