​Well Maintenance and Cleanout History

For well maintenance and cleanout operations that involve emplacing fluid containing acid in the well or application of pressure to the formation that exceeds formation pore pressure, but are not well stimulation treatment, operators must download, complete, and submit the Well Maintenance (OG179) form (updated August 1, 2017) within 60 days after completing the operation.

Guidance and Sample Form (PDF)

Well maintenance reports submitted by operators can be searched on the Well Maintenance Data webpage.

For Operators

As mentioned in NTO-2017-05 (PDF), a treatment with pressures exceeding the formation fracture gradient and/or any well treatment or operation that involves emplacing acid in a well and that uses a volume of fluid equal to or greater than the Acid Volume Threshold (AVT) (PDF) for the operation shall be presumed to be a well stimulation treatment unless it is demonstrated to the satisfaction of the Division that the treatment, as designed, does not enhance oil and gas production or recovery by increasing the permeability of the formation. Well Stimulation Treatment may not commence without a valid permit approved by DOGGR (Cal. Code Regs., title 14, § 1783(a)). Demonstrations must be made to DOGGR prior to performing any operation that exceeds formation fracture gradient or involves emplacing acid in a well and that uses a volume of fluid equal or greater than the Acid Volume Threshold. DOGGR highly recommends that any operation which may come close to the above thresholds be brought to DOGGR's attention for an advance determination from DOGGR prior to commencing the operation. Failure to make the requisite demonstration in advance of the operation may result in enforcement action, including but not limited to issuance of a civil penalty and/or order for remedial action.

See below for additional information on the applicability of the requirements under California Code of Regulations, Title 14, section 1777.4, and contact DOGGR if you have questions. 

Statutes and Regulations (January 2019) (PDF)

Document Submission

Documents must be submitted in electronic format via an online drop-box using the approved forms provided by DOGGR. Upon request, each operator will be sent an email with a personal drop-box link and password. Please request access to DOGGR's Box.com account by sending an email to WST@conservation.ca.gov

Box Instructions (PDF)

DOGGR is issuing the following notice directing operators to submit well maintenance activity related reports to DOGGR Headquarters for review and processing:

NTO 2019-03: Submittal Requirements for the Well Maintenance Form (OG179)

Aggregated Data Reporting

Subject to the approval of DOGGR, under Cal. Code Regs., title 14, section 1777.4(d), an operator may propose a plan for submitting aggregated information regarding a specific type of repeated operation that involves emplacing fluid containing acid in the well, yet clearly does not meet the definition of a well stimulation treatment.  Once approved, aggregated data is due to DOGGR annually on January 31.

A proposal for an aggregated plan should contain, but is not limited to the following items:

    1. The oil and gas field names you would like your plan to cover
    2. A description of the different types of well maintenance to be covered by your plan
    3. An explanation of why you believe this work is clearly not well stimulation
    4. Examples of typical volumes of fluids containing acids emplaced in the well
    5. A range of volumes of fluids containing acids emplaced in the well (minimums and maximums)
    6. The name (trade name) of each chemical, its purpose and a Safety Data Sheet (SDS) for each chemical you plan on using

Well Maintenance FAQs