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How Do Water Well Drilling Rig Makers Help Customers Fish Out Broken Drill Pipes

Drill pipe breakage is one of the most common serious accidents in water well Drilling Rig drilling. Once it happens, if not handled properly, at best you lose the drilling tools and delay the schedule, and at worst the borehole is scrapped. This article combines the practical experience of Guangzhou International Technology in the water well drilling rig field, sorts out a systematic handling plan from accident diagnosis to fishing tool selection, and includes a comparison table of commonly used fishing tools for practitioners' reference.

Drill Pipe Breakage Is a Tricky Accident in Water Well Construction

How Do Water Well Drilling Rig Makers Help Customers Fish Out Broken Drill Pipes

During water well drilling rig drilling, drill pipe breakage is one of the more common downhole accidents. Whether it's due to complex geological conditions, long-term fatigue of the drill pipe, or improper operation, once the drill pipe breaks, if it can't be handled in time and effectively, it will not only cause the drilling tools to be lost, but may also lead to the borehole being scrapped, bringing huge economic losses to the customer. According to industry statistics, for every five wells drilled, one may need fishing operations. Therefore, how to help customers efficiently deal with the fishing problem after drill pipe breakage has become an important indicator for measuring the service capability of water well drilling rig manufacturers.

The serious impact of drill pipe breakage accidents on customers' construction progress and costs. It is not only necessary to provide high-quality water well drilling rig equipment and drill pipe accessories, but also to establish an after-sales technical support system to help customers deal with various downhole accidents.

Common Causes and Prevention of Drill Pipe Breakage

Before discussing the fishing plan, it is necessary to first understand the common causes of drill pipe breakage. Complex geological conditions, broken rock formations, drill pipe material fatigue, improper operation, and other factors can all cause breakage. Especially in adverse geological sections such as faults, fissures, karst trenches, or weak interbeds, it is easy for the phenomenon of no water return and cuttings discharge at the hole opening to occur during drilling, which then leads to sticking and even drill pipe breakage.
Regularly check the drill pipe condition: Carry out regular flaw detection on drill pipes that have been used for a long time to find fatigue cracks in time.
Choose suitable drilling tools according to the formation: According to the characteristics of different rock layers, select matching drill pipes and drill bits to avoid overload operation.
Standardize the operation process: Strictly control the drilling pressure and rotation speed to avoid sudden force application causing uneven stress on the drill pipe.

Fishing Plans After Drill Pipe Breakage

1. Internal fishing method tools

Male taper: It is a tool specially used for making threads and fishing from the inner hole of hollow fish such as drill pipes and oil pipes. It is made of high-quality alloy steel and subjected to special heat treatment, and has the advantages of high strength, high toughness, and easy thread making. The fishing threads of the male taper are divided into sawtooth and triangle types. The surface hardness of the threads can reach HRC60~65, and it can effectively bite the inner wall of the broken drill pipe.
"Shell" type fisher: It is an efficient internal fishing tool developed in recent years. Its design principle is similar to a ball-card lifter. By dropping a steel ball, the fisher is tightly connected to the inner wall of the broken drill pipe. In practical application, this kind of fisher once successfully handled a broken drill accident with a hole depth of more than 1,700 meters, and succeeded in one fishing attempt.

2. External fishing method tools

Releasable slip overshot: It is used to fish columnar fish such as drill collars, drill pipes, and oil pipes from the outside. When the fish is caught but cannot be pulled out, the overshot can release the fish and be retrieved to the surface. In addition, after the slip overshot catches the fish, it can also perform high-pressure mud circulation, and the milling shoe it carries can effectively repair the top of the fish, making it easier for the fish to enter the overshot smoothly.
Female taper: It is a tool specially used for making threads and fishing from the outer wall of tubular fish such as drill pipes and oil pipes. Used together with the male taper, it can deal with different types of breakage situations.

3. Auxiliary fishing tools

In complex accident handling, various auxiliary tools also need to be used together. Lead impression printing is an important procedure before fishing operations. Through lead impression printing, the nature of the downhole accident can be judged, including the degree of casing damage, the inner and outer diameters of the fish, and the downhole state, providing a basis for the next fishing step. In addition, auxiliary tools such as jars and safety joints are also often used in complex fishing operations.

Technical support services of Guangzhou International Technology

Service stage	Service content	Service goal
Pre-sales consultation	Provide free technical consultation services and recommend suitable drill pipes and fishing tools according to the customer's geological conditions	Help customers prevent drill pipe breakage accidents
Accident diagnosis	Assist customers in analyzing the causes of drill pipe breakage and determine the nature of the accident	Formulate targeted fishing plans
On-site guidance	Provide installation guidance services and regularly track product usage status	Solve problems encountered by customers in time
After-sales follow-up	Provide solutions to relevant information or problems fed back by customers in the shortest time	Ensure customers' construction progress

Guangzhou International Technology's water well drilling rig products include vehicle-mounted water well drilling rigs and many other models, equipped with positive circulation rotary drilling rig technology, and can adapt to drilling needs under different geological conditions. The company also supplies various drilling accessories, including drill pipes, drill bits, Mud Pumps, etc., providing customers with one-stop procurement services.

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How Do Water Well Drilling Rig Makers Help Customers Fish Out Broken Drill Pipes

Precautions for Fishing Operations

1. Accurately determine the accident location: By measuring the remaining length on the rig floor and the stand, determine the exact depth of the accident head. This is the basis for selecting fishing tools and the depth of running in.
2. Reasonably select fishing tools: According to the specifications of the broken drill pipe, the breakage form, and the downhole situation, choose the appropriate type of fishing tool. For cases with irregular breakage forms, special tools such as the "shell" type fisher may be needed.
3. Control the fishing force: During the fishing process, operate smoothly and avoid excessive force causing secondary accidents. When using a jar, it can provide controllable impact force to help remove sticking.

4. Make a good emergency plan: Before fishing operations, a detailed emergency plan should be made, including the preparation of spare fishing tools, personnel division of labor, etc., to ensure a quick response when complex situations are encountered.

The Summary Is as Follows:

The fishing treatment after drill pipe breakage is an unavoidable technical problem in water well construction. Choosing a water well drilling rig manufacturer that can provide complete technical support and high-quality fishing tools is of great significance for reducing accident losses and ensuring construction progress. With its professional team and complete service system, Guangzhou International Technology Co., Ltd. can provide customers with all-round support from drilling tool selection, accident prevention to fishing treatment, and is a trustworthy partner for water well construction enterprises.

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