{"id":12432,"date":"2026-02-25T08:13:32","date_gmt":"2026-02-25T08:13:32","guid":{"rendered":"https:\/\/rawchemicalmart.com\/?p=12432"},"modified":"2026-02-27T04:29:12","modified_gmt":"2026-02-27T04:29:12","slug":"technical-guide-api-13a-pac-lv-specifications","status":"publish","type":"post","link":"https:\/\/rawchemicalmart.com\/ru\/technical-guide-api-13a-pac-lv-specifications\/","title":{"rendered":"Understanding  Polyanionic Cellulose (PAC-LV) COA in Drilling Fluids"},"content":{"rendered":"<p>In the high-stakes environment of offshore and deep-well drilling, the chemical integrity of drilling fluids is the primary defense against geological failure. <strong>Polyanionic Cellulose (PAC)<\/strong>, specifically the Low Viscosity (LV) grade, serves as a critical rheology modifier and filtration control agent.<\/p>\n\n\n\n<p>Compliance with the <strong>API-13A (American Petroleum Institute)<\/strong> standard is not merely a regulatory hurdle; it is a benchmark of molecular engineering that ensures borehole stability under extreme salinity and thermal stress.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"784\" src=\"https:\/\/rawchemicalmart.com\/wp-content\/uploads\/2026\/02\/The_COA-_file_of_PAC_LV-1024x784.png\" alt=\"\" class=\"wp-image-12458\" srcset=\"https:\/\/rawchemicalmart.com\/wp-content\/uploads\/2026\/02\/The_COA-_file_of_PAC_LV-1024x784.png 1024w, https:\/\/rawchemicalmart.com\/wp-content\/uploads\/2026\/02\/The_COA-_file_of_PAC_LV-300x230.png 300w, https:\/\/rawchemicalmart.com\/wp-content\/uploads\/2026\/02\/The_COA-_file_of_PAC_LV-768x588.png 768w, https:\/\/rawchemicalmart.com\/wp-content\/uploads\/2026\/02\/The_COA-_file_of_PAC_LV-16x12.png 16w, https:\/\/rawchemicalmart.com\/wp-content\/uploads\/2026\/02\/The_COA-_file_of_PAC_LV-600x460.png 600w, https:\/\/rawchemicalmart.com\/wp-content\/uploads\/2026\/02\/The_COA-_file_of_PAC_LV.png 1115w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Technical Specification Analysis: The API-13A Benchmark<\/h2>\n\n\n\n<p>The following table synthesizes the core quality indicators (CQIs) based on standard API-13A requirements and typical high-performance laboratory results.<\/p>\n\n\n\n<table id=\"tablepress-105\" class=\"tablepress tablepress-id-105\">\n<thead>\n<tr class=\"row-1\">\n\t<th class=\"column-1\">\u0422\u0435\u0441\u0442\u043e\u0432\u044b\u0439 \u044d\u043b\u0435\u043c\u0435\u043d\u0442<\/th><th class=\"column-2\">API-13A Standard<\/th><th class=\"column-3\">Test Result<\/th><th class=\"column-4\">Industrial Significance<\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"row-striping row-hover\">\n<tr class=\"row-2\">\n\t<td class=\"column-1\">Purity (%)<\/td><td class=\"column-2\">\u226565.0<\/td><td class=\"column-3\">68.5<\/td><td class=\"column-4\">Concentration of active polymer; directly impacts the cost-efficiency of bulk procurement.<\/td>\n<\/tr>\n<tr class=\"row-3\">\n\t<td class=\"column-1\">Degree of Substitution (D.S.)<\/td><td class=\"column-2\">\u22650.90<\/td><td class=\"column-3\">0.92<\/td><td class=\"column-4\">Higher D.S. ensures superior salt tolerance and molecular stability in harsh drilling fluids.<\/td>\n<\/tr>\n<tr class=\"row-4\">\n\t<td class=\"column-1\">Loss on Drying (%)<\/td><td class=\"column-2\">\u226410.0<\/td><td class=\"column-3\">8<\/td><td class=\"column-4\">Controls moisture content to prevent product caking and microbial degradation during transit.<\/td>\n<\/tr>\n<tr class=\"row-5\">\n\t<td class=\"column-1\">\u0417\u043d\u0430\u0447\u0435\u043d\u0438\u0435 pH<\/td><td class=\"column-2\">7.0 \u2013 9.5<\/td><td class=\"column-3\">8.3<\/td><td class=\"column-4\">Maintains a non-corrosive environment for drilling tools and optimizes polymer longevity.<\/td>\n<\/tr>\n<tr class=\"row-6\">\n\t<td class=\"column-1\">Apparent Viscosity (4% Salt)<\/td><td class=\"column-2\">40 max<\/td><td class=\"column-3\">22<\/td><td class=\"column-4\">Confirms the \"Low Viscosity\" (LV) grade, ensuring minimal resistance to mud flow.<\/td>\n<\/tr>\n<tr class=\"row-7\">\n\t<td class=\"column-1\">Fluid Loss (4% Salt)<\/td><td class=\"column-2\">16 max<\/td><td class=\"column-3\">10.5<\/td><td class=\"column-4\">Crucial \"shielding\" factor that prevents water migration into geological strata.<\/td>\n<\/tr>\n<tr class=\"row-8\">\n\t<td class=\"column-1\">Content of Starch<\/td><td class=\"column-2\">\u041e\u0442\u0441\u0443\u0442\u0441\u0442\u0432\u0443\u044e\u0449\u0438\u0439<\/td><td class=\"column-3\">Conform<\/td><td class=\"column-4\">Guarantees resistance to high-temperature thinning and fermentation.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-105 from cache -->\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">The Chemistry of Performance: Deep Dive into Indicators<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">A. Degree of Substitution (D.S.) &amp; Salt Tolerance<\/h3>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"947\" height=\"428\" src=\"https:\/\/rawchemicalmart.com\/wp-content\/uploads\/2026\/02\/the-hydroxyl-groups-are-replaced-by-carboxymethyl-groups.jpg\" alt=\"\" class=\"wp-image-12450\" srcset=\"https:\/\/rawchemicalmart.com\/wp-content\/uploads\/2026\/02\/the-hydroxyl-groups-are-replaced-by-carboxymethyl-groups.jpg 947w, https:\/\/rawchemicalmart.com\/wp-content\/uploads\/2026\/02\/the-hydroxyl-groups-are-replaced-by-carboxymethyl-groups-300x136.jpg 300w, https:\/\/rawchemicalmart.com\/wp-content\/uploads\/2026\/02\/the-hydroxyl-groups-are-replaced-by-carboxymethyl-groups-768x347.jpg 768w, https:\/\/rawchemicalmart.com\/wp-content\/uploads\/2026\/02\/the-hydroxyl-groups-are-replaced-by-carboxymethyl-groups-18x8.jpg 18w, https:\/\/rawchemicalmart.com\/wp-content\/uploads\/2026\/02\/the-hydroxyl-groups-are-replaced-by-carboxymethyl-groups-600x271.jpg 600w\" sizes=\"(max-width: 947px) 100vw, 947px\" \/><\/figure>\n\n\n\n<p>The D.S. represents the average number of hydroxyl groups on each anhydroglucose unit that have been replaced by carboxymethyl groups. For PAC-LV, a D.S. \u2265 0.90 is vital.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>High D.S. (0.92):<\/strong> Provides superior solubility in saturated brine. The negatively charged carboxyl groups (-CH2COO-) create electrostatic repulsion, keeping the polymer chain extended even in high-electrolyte environments.<\/li>\n\n\n\n<li><strong>Low D.S. (&lt;0.70):<\/strong> Leads to &#8220;coiling&#8221; of the molecule in salt water, causing the polymer to precipitate and the wellbore to lose its protective seal.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">B. Fluid Loss: The &#8220;Tight Filter Cake&#8221; Mechanism<\/h3>\n\n\n\n<p><a href=\"https:\/\/rawchemicalmart.com\/ru\/science-of-fluid-loss-control-pac-drilling-muds\/\">Fluid loss<\/a> (measured at 10.5 mL in the sample) is the most critical field-performance metric. PAC-LV functions by adsorbing onto clay particles to form a <strong>thin, tough, and low-permeability filter cake<\/strong> on the borehole wall.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Mechanism:<\/strong> In a 4% NaCl solution, the PAC-LV molecules must remain dispersed enough to bridge the microscopic pores of the formation. A result of 10.5 mL (against a limit of 16) indicates a highly efficient &#8220;sealing&#8221; capability, which protects the oil-bearing zone from water damage.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">C. Apparent Viscosity: Why &#8220;Low&#8221; is Often Better<\/h3>\n\n\n\n<p>In deep-well drilling, increasing the viscosity of the entire mud system can lead to excessive pump pressure and &#8220;lost circulation.&#8221;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>PAC-LV (Low Viscosity):<\/strong> Engineered to provide maximum filtration control with minimal impact on the mud\u2019s thickness. This allows for faster drilling speeds (ROP) while maintaining the structural integrity of the wellbore.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">D.<strong>Loss on Drying (Moisture Content):<\/strong> <\/h3>\n\n\n\n<p>While standard limits are \u226410\\%, our typical result of 8.0% ensures the polymer stays free-flowing without clumping (fish eyes) during mixing. Lower moisture also means you are paying for active polymer, not water weight.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">E. <strong>pH Value (8.3):<\/strong><\/h3>\n\n\n\n<p> A slightly alkaline pH is critical for preventing the corrosion of drilling strings. It also optimizes the hydration rate of the PAC-LV, ensuring it reaches peak performance quickly after being added to the mud system.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">F. <strong>Purity &amp; Processing Cost:<\/strong> <\/h3>\n\n\n\n<p>Our PAC-LV purity ranges from 65% to 99%. To achieve higher purity, the crude slurry undergoes multiple ethanol-water washing cycles to remove byproduct salts. This direct correlation means that while 99% purity offers maximum potency, the increased washing cycles result in a higher production cost.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<div style=\"border-left: 5px solid #0056b3; background: #fff; box-shadow: 0 2px 10px rgba(0,0,0,0.1); padding: 20px; margin: 20px 0;\">\n    <h4 style=\"margin: 0 0 10px 0;\">\ud83d\udd2c The Science Behind the Specs<\/h4>\n    <p style=\"font-size: 14px; color: #555;\">Understand how API 13A parameters directly influence the filtration mechanism in drilling muds.<\/p>\n    <a href=\"https:\/\/rawchemicalmart.com\/ru\/science-of-fluid-loss-control-pac-drilling-muds\/\" style=\"color: #0056b3; font-weight: bold; text-decoration: underline;\">Explore Fluid Loss Science \u2192<\/a>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Industrial Manufacturing &amp; Quality Control<\/h2>\n\n\n\n<p>To achieve a &#8220;Qualified&#8221; API-13A status, <a href=\"https:\/\/rawchemicalmart.com\/ru\/polyanionic-cellulose-pac-manufacturing-process\/\">the manufacturing process<\/a> focuses on two critical stages:<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>Alkalization &amp; Etherification:<\/strong> Precision control of the NaOH to cellulose ratio ensures the D.S. stays above 0.90. Any uneven reaction leads to &#8220;gel specks&#8221; that fail the starch-free and fluid-loss tests.<\/li>\n\n\n\n<li><strong>The Ethanol Wash (Purity Control):<\/strong> Higher purity (reaching 68.5% or higher) is achieved through multiple stages of high-concentration ethanol washing. This removes byproduct salts (Sodium Chloride and Sodium Glycolate), ensuring the final product is highly concentrated and potent.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Operational Impact: Cost vs. Performance<\/h2>\n\n\n\n<p>Using a &#8220;Qualified&#8221; API-13A PAC-LV reduces the <strong>Total Cost of Ownership (TCO)<\/strong> for drilling projects:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Lower Dosage:<\/strong> High-purity PAC requires less material to achieve the same fluid-loss targets.<\/li>\n\n\n\n<li><strong>Enhanced Equipment Life:<\/strong> A stable pH (8.3) and low starch content prevent the corrosion of drill strings and the souring of mud systems.<\/li>\n\n\n\n<li><strong>Borehole Stability:<\/strong> Superior filter cakes prevent &#8220;differential sticking,&#8221; a common cause of multi-million dollar drilling delays.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Frequently Asked Questions (FAQ)<\/h3>\n\n\n\n<p><strong>Q: Why is &#8220;Starch Absent&#8221; a mandatory requirement for API-13A?<\/strong><\/p>\n\n\n\n<p>A: API-13A standards strictly mandate the absence of starch because it is highly susceptible to bacterial fermentation and thermal degradation at temperatures exceeding 90\u00b0C. In high-stakes drilling environments, any residual starch can lead to a sudden collapse of the mud&#8217;s rheological properties and filtration control. A &#8220;Conform&#8221; result in our COA ensures the PAC-LV remains chemically stable and biocide-resistant in high-temperature, high-pressure (HTHP) conditions.<\/p>\n\n\n\n<p><strong>Q: Can PAC-LV be used in freshwater muds?<\/strong><\/p>\n\n\n\n<p>A: Yes, while it is optimized for salt water, PAC-LV provides excellent filtration control in freshwater systems without significantly increasing the mud&#8217;s yield point.<\/p>\n\n\n\n<p><strong>Q: How does &#8220;Loss on Drying&#8221; affect shelf life?<\/strong><\/p>\n\n\n\n<p>A: A moisture content of 8.0% (within the &lt;10% limit) ensures the powder remains free-flowing for up to 24 months if stored in a dry, ventilated warehouse using standard 25kg PE\/PP packaging.<\/p>","protected":false},"excerpt":{"rendered":"<p class=\"tmnf_excerpt\">Optimize drilling fluid rheology with API-13A compliant Polyanionic Cellulose (PAC-LV). High salt tolerance &#038; fluid loss control. View technical specs &#038; buy now.\n<\/p>","protected":false},"author":3,"featured_media":12445,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[43],"tags":[],"class_list":["post-12432","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-oilfield-chemicals"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>API-13A Polyanionic Cellulose (PAC-LV) Technical Specifications Guide<\/title>\n<meta name=\"description\" content=\"Master the technical specs of PAC-LV. Learn how Purity, D.S., and Fluid Loss impact drilling performance under API-13A standards. 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