Obviousness

To analyze the obviousness of US patent 12110780 under 35 U.S.C. § 103, we will examine the independent claims in light of the prior art explicitly discussed within the patent's specification. The patent itself identifies three key prior art references: U.S. Pat. No. 4,372,398 ('398 patent), U.S. Pat. No. 8,695,730 ('730 patent), and U.S. Pat. No. 9,759,060 ('060 patent).

The present invention (US12110780) aims to overcome the limitations of existing magnetic ranging techniques, specifically by eliminating the need for wireline deployment during either excitation or detection, and by providing efficient target well excitation and accurate detection while drilling.

Independent Claims of US12110780:

The independent claims define an apparatus (Claims 1, 9, 18) and a method (Claim 19) for magnetic ranging. Key elements across these claims include:

• A power supply.
• At least one section of drill pipe operatively connected to the power supply.
• At least one wire inside the drill pipe connecting the power supply and the drill pipe.
• A connection between the internal wire and the drill pipe that is rigid, not spring-loaded, and maintains a continuous electrical connection while drilling.
• A first electrically insulated member (e.g., gap sub) causing electrical energy to exit a section of drill pipe into the formation.
• A sensor for detecting a magnetic ranging signal.
• In the method claim, energizing the power supply to inject current into the formation to create a magnetic ranging signal on a target well, sampling the signal, and adjusting drilling operations, potentially while drilling is taking place.

Analysis of Prior Art from US12110780:

1. U.S. Pat. No. 4,372,398 ('398 patent): This patent describes a method for determining the location of a deep-well casing by magnetic field sensing. It involves deploying a signal source and a receiver in a common wireline assembly into a drilling well (relief well). Electrical power is transmitted down a multiconductor wireline, delivered into the formation, collects on the target well casing, and creates a magnetic field that is subsequently detected by the wireline receiver. The '398 patent teaches the fundamental principles of inducing and detecting magnetic ranging signals but explicitly relies on wireline deployment, necessitating the retraction of the drilling assembly for measurements, which is described as "time consuming and expensive."

2. U.S. Pat. No. 8,695,730 ('730 patent): This patent attempts to streamline the process by containing a current source within the drilling assembly, separated by an electrically insulative gap sub. This shows a motivation to perform ranging while drilling using a drill string-integrated current source and gap subs. However, the present patent (US12110780) states that a drawback of '730 is that "the effective circuit for current flow is localized about the drilling assembly. The effective circuit that is created downhole does not include or severely limits the along well current flow path of the target well tubular, and therefore sufficient signal for a ranging determination is often not achievable."

3. U.S. Pat. No. 9,759,060 ('060 patent): This patent proposes using a wireline electrode deployed inside the drill pipe. While this moves closer to a "while drilling" approach, US12110780 notes that it "still involves the cessation of drilling for extended periods of time while wireline is deployed concentrically in the drill string... This approach is risky, however, in that it involves maintaining the drill string more or less stationary for the duration of the data collection process."

Obviousness Argument under 35 U.S.C. § 103:

A person having ordinary skill in the art (PHOSITA) in wellbore surveying and drilling operations, motivated by the stated problems in the prior art, would have been motivated to combine elements from the '398 patent, the '730 patent, and general knowledge regarding integrating conductors into drill pipe, to arrive at the claimed inventions of US12110780.

Combination: U.S. Pat. No. 4,372,398 in view of U.S. Pat. No. 8,695,730, further informed by general knowledge of integrating insulated conductors into drill pipe for power and data transmission.

Motivation to Combine:

1. Improve Efficiency of Magnetic Ranging (from '398): The '398 patent teaches an effective method for magnetic ranging by inducing current on a target well casing and detecting the resulting magnetic field. A PHOSITA would be motivated to retain this proven method but eliminate the "time consuming and expensive" wireline deployment that requires tripping the drill string.
2. Achieve "While Drilling" Capability (from '730): The '730 patent provides a clear motivation to perform ranging while drilling by integrating a current source and gap subs into the drilling assembly. This directly addresses the drawback of the '398 patent by attempting to allow measurements without pulling the drill string.
3. Overcome Limitations of '730 and '060 with Reliable Current Delivery: The critical flaw of '730, as identified by US12110780, is the "localized circuit" that "severely limits the along well current flow path of the target well tubular, and therefore sufficient signal for a ranging determination is often not achievable." Similarly, the '060 patent, while moving the wireline inside the drill pipe, still requires stopping drilling and introduces sticking risks.
   A PHOSITA, seeking to overcome these issues to achieve reliable and effective magnetic ranging while drilling, would be motivated to implement a more robust and permanent current delivery system within the drill string. General knowledge in the art (as supported by the description in US12110780 referencing technologies like that in US20190119990A1, which describes "a radially expansive conductive element is used to line the interior of an industry standard drill pipe... insulated from the ID of the drill pipe and the drilling fluid") would suggest integrating dedicated, insulated electrical conductors directly into the drill pipe sections.

How the Combination Renders the Claims Obvious:

• Power Supply, Drill Pipe, and Sensor: The presence of a power supply, drill pipe, and a sensor for detecting magnetic ranging signals are all common elements in the prior art, specifically in the context of drilling and ranging operations ('398 and '730).
• Wire Inside the Drill Pipe: While '060 uses a wireline inside the drill pipe (though with drawbacks), the idea of running electrical conductors inside drill pipe for power and data is a known engineering solution for downhole tools. The specification of US12110780 itself describes such configurations in detail (FIGS. 9A-9C) and mentions "coating a section or all of the ID of a commercial pipe with a nonconductive material such as epoxy, and then installing one or more ribbons of insulated conductor into the epoxy layer". A PHOSITA would recognize the advantage of a permanently installed internal wire system over a deployable wireline system for continuous "while drilling" operations.
• Rigid, Not Spring-Loaded, Continuous Electrical Connection While Drilling: To ensure the reliability and functionality of an integrated internal conductor system for "while drilling" operations, a PHOSITA would naturally design connections that are robust, rigid, and maintain electrical continuity despite the harsh drilling environment. The descriptions in US12110780 of conductive rings (904, 905 in FIG. 9C) that "assures contact from box to pin of the drill pipes when joints of pipe are added to the drill stem" exemplify such an obvious engineering choice to create a rigid and continuous connection suitable for drilling. Avoiding spring-loaded connections, which might be susceptible to vibration or wear in a drilling context, would also be an obvious design decision for reliability.
• First Electrically Insulated Member (Gap Sub) Causing Electrical Energy to Exit: The '730 patent explicitly teaches the use of an "electrically insulative gap sub in the assembly" to influence current flow in a drilling context. A PHOSITA would understand how to employ such gap subs to direct current into the formation at a specific point, building on the concepts in '730 and the current injection principles from '398. The 'flow-through' and bracketing configurations shown in US12110780 (FIG. 2, FIG. 3, FIG. 7) would be obvious adaptations for controlling current injection effectively.
• Method Steps (Claim 19):
  • Installing sensor, gap sub, drill pipe: These are standard procedural steps for assembling a downhole drilling and measurement system.
  • Connecting power supply via internal wire at surface with rigid connection: This step directly results from the motivation to integrate robust internal conductors for continuous power delivery while drilling. Connecting at the surface is a practical aspect of power delivery to the drill string.
  • Energizing power supply to inject current, create signal on target well: This is the core magnetic ranging principle taught by '398, implemented using the integrated current delivery system to achieve effective current flow into the formation and onto the target well, addressing the "localized circuit" drawback of '730.
  • Sampling signal and adjusting drilling operations: These are standard outcomes and control mechanisms for any ranging system, including those described in '398.
  • Sampling while drilling (Claim 22): This is the direct result of successfully integrating the robust internal conductor system with gap subs into a drilling assembly, enabling continuous ranging measurements without interruptions, thereby achieving the "while drilling" objective that prior art like '398 and '060 failed to fully realize.

In conclusion, a PHOSITA would have been motivated to combine the known magnetic ranging principles of US '398 with the "while drilling" objective and gap sub technology of US '730. To effectively address the limitations of localized current paths (in '730) and the need for drilling cessation (in '060), the PHOSITA would integrate known "wired pipe" technology to provide robust, insulated internal conductors with rigid and continuous electrical connections throughout the drill string. This combination renders the apparatus and method claims of US12110780 obvious.