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Mud acid

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Journal Articles
SPE Prod & Oper 37 (03): 397–413.
Paper Number: SPE-209224-PA
Published: 10 August 2022
... and hydrofluoric acid (HF) called organic mud acid (OMA) as the main treatment acid. The composition of OMA was a mixture of 9% formic acid and 1% HF or 10% formic acid and 0.5% HF in this work. Results of the coreflooding tests with the preflush acid indicated permeability enhancement in all the samples...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, October 3–6, 1999
Paper Number: SPE-56527-MS
... Abstract Matrix Acidizing has been used as the preferred method of stimulating hydrocarbon producing wells in the Niger Delta Basin. The majority of reservoirs in this area are Sandstone reservoirs. Conventional Mud Acid system has been the main HCl:HF acid mixture used in restoring...
Proceedings Papers

Paper presented at the SPE/ICoTA Well Intervention Conference and Exhibition, March 26–27, 2019
Paper Number: SPE-194236-MS
... Abstract In the Gulf of Mexico the wells are usually completed as cased and perforated or frac packed. These wells can be damaged during the drilling phase, completion phase and/or when they are on production. This paper presents the unique combined use of chelant and mud acid treatments...
Proceedings Papers

Paper presented at the Abu Dhabi International Petroleum Exhibition & Conference, November 7–10, 2016
Paper Number: SPE-182976-MS
... with double and quadruple permeability reduction upon fresh water exposure. Regular mud acid is known for its dissolving power of the alumino silicate minerals, yet the secondary and tertiary reaction still cast a damaging potential on the sandstone formation especially in presence of fines migration...
Journal Articles
SPE Prod & Oper 32 (02): 196–207.
Paper Number: SPE-175833-PA
Published: 12 October 2016
... or on how acid-solubility values vary as a function of time, temperature, and dynamic conditions. This study investigates factors affecting the interactions of regular mud acid [hydrofluoric acid (HF)/hydrochloric acid (HCl) = 3:12] with sand and clay-based proppants under downhole conditions. Experiments...
Journal Articles
Journal: SPE Journal
SPE J. 21 (03): 1050–1060.
Paper Number: SPE-169395-PA
Published: 15 June 2016
...Qin Ji; Lijun Zhou; Hisham Nasr-El-Din Summary Aluminum chloride (AlCl 3 ) has been used as a retarding agent for mud acid for a long time; its applications are studied in the laboratory and tested in the field. The theory and mechanism of AlCl 3 retardation were investigated in many works...
Proceedings Papers

Paper presented at the SPE North Africa Technical Conference and Exhibition, September 14–16, 2015
Paper Number: SPE-175833-MS
... ceramic materials. Studying the acid resistance of proppants is important. Acids are needed to remove the scale and clays that affect the fracture conductivity. This study investigated the different factors affecting the interactions between mud acid and sand proppants. Several experiments were conducted...
Proceedings Papers

Paper presented at the International Petroleum Technology Conference, March 26–28, 2013
Paper Number: IPTC-16418-MS
... drillstem/well testing oil production application wellbore productivity international petroleum technology conference novel organic-solvent-mud-acid stimulation approach organic deposit water breakthrough reduction stimulation job Abstract One of the key successes in optimising a mature...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference, May 21–22, 2001
Paper Number: SPE-68925-MS
..., but the rates drop rapidly even at very low water cuts. A team of engineers and scientist from the operator and service companies analyzed the problem and started to develop solutions. Migration of kaolinite fines was identified as the major cause for productivity decline. A mud acid/clay acid system to remove...
Journal Articles
J Pet Technol 50 (03): 48–50.
Paper Number: SPE-0398-0048-JPT
Published: 01 March 1998
..._ JPT staff This article is a synopsis of paper SPE 39483, "Aluminum Scaling and Formation Damage Due to Regular Mud-Acid Treatment," by H.A. Nasr-El-Din, SPE, and J.A. Hopkins, SPE, Saudi Aramco, and C.E. Shuchart, SPE, and T. Wilkinson, SPE, Halliburton Energy Services, originally presented...
Proceedings Papers

Paper presented at the SPE Formation Damage Control Conference, February 18–19, 1998
Paper Number: SPE-39483-MS
... extensive examination, it was determined that the only possible source of aluminum was a previous HF stimulation. Examination of the well history showed that a typical 12% HCl-3% HF mud acid stimulation treatment was conducted during the original drilling and testing of the well. 9F NMR spectroscopy...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, October 4–7, 1992
Paper Number: SPE-24782-MS
... Abstract This paper documents the design process and production response of a successful foamed, high hydrofluoric (HF) acid concentration (10% hydrochloric (HCl) acid/5% HF), high volume (1 50 gal/ft) mud acid stimulation program performed in 1991 on thermal production wells in the Tulare...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, October 6–9, 1991
Paper Number: SPE-22855-MS
... The chemical reactions between mud acid (HF/HCl mixtures) and sandstone minerals are numerous and complex. To obtain tractable models of mud acid treatments it is common practice to approximate the chemistry as the dissolution of two "lumped" minerals. Examination of coreflood data shows...
Journal Articles
J Pet Technol 27 (10): 1199–1203.
Paper Number: SPE-5153-PA
Published: 01 October 1975
...C.C. Templeton; E.A. Richardson; G.T. Karnes; J.H. Lybarger Since regular mud acid can dissolve clay only within a few inches of the wellbore, removal of deeper permeability damage caused by clay requires in-situ generation of hydrofluoric acid. Such a retarded acidization can be based...
Proceedings Papers

Paper presented at the 8th European Formation Damage Conference, May 27–29, 2009
Paper Number: SPE-119994-MS
... Abstract Cement attack by acids during acid stimulation is a serious problem as indicated by both field experience and lab tests. A new cost effective technique was developed to enhance cement resistance to full strength mud acid. This technique will not only protect cement from acid attack...
Damage Skin per Zone for Two <span class="search-highlight">Mud</span> <span class="search-highlight">Acid</span> Formulations: Both <span class="search-highlight">mud</span> <span class="search-highlight">acid</span> formulati...
Published: 31 May 1999
Figure 4 Damage Skin per Zone for Two Mud Acid Formulations: Both mud acid formulations used in coiled tubing treatments with annular flow yielded uniform damage of approximately 10 in the thief zones 1–3. However, the stronger mud acid resulted in better damage removal in the targeted non-thief z... More
Proppant <span class="search-highlight">acid</span> solubility in 12:3 HCl&#x2F;HF <span class="search-highlight">mud</span> <span class="search-highlight">acid</span>.
Published: 08 January 2015
Fig. 10 Proppant acid solubility in 12:3 HCl/HF mud acid. More
Perm vs time trace for 10% Acetic <span class="search-highlight">acid</span> (HAc) +9&#x2F;1 <span class="search-highlight">mud</span> <span class="search-highlight">acid</span> with Berea core ...
Published: 29 September 2002
Fig. 15 Perm vs time trace for 10% Acetic acid (HAc) +9/1 mud acid with Berea core at 350°F (177°C) More
Solubility of various <span class="search-highlight">acid</span> resistant cements in full strength <span class="search-highlight">mud</span> <span class="search-highlight">acid</span> at 1...
Published: 27 May 2009
Fig. 5 Solubility of various acid resistant cements in full strength mud acid at 150 °F for 2h. More
Spent <span class="search-highlight">acid</span> analysis of full a strength <span class="search-highlight">mud</span> <span class="search-highlight">acid</span> due to reaction with cement...
Published: 27 May 2009
Fig. 8 Spent acid analysis of full a strength mud acid due to reaction with cement More

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