What is a workover rig
The workover rig is the most basic and main source of power in workover and downhole operations. It is a large and expensive piece of equipment. Therefore, special attention must be paid to comply with operating procedures and safety precautions during operation and use.
Starting of the workover rig
First check the lubricating oil level of the engine, the liquid level of the radiator, and the oil level of the diesel tank, and check whether there are foreign objects around the engine that affect the engine rotation. After starting the engine, first check whether the oil pressure is normal, and then carefully Listen to the engine for abnormal noise, whether the generator is generating electricity, and whether the air pump is normal.
Starting and running of the workover rig
The air pressure must reach the specified pressure before starting, and the engine must reach the specified temperature.Check whether there are any obstacles around the workover rig that will affect the driving of the vehicle. Whether the parts on the vehicle are fixed firmly. Start with the first gear, shift the gear first, then roll the hand brake, step on the accelerator lightly, and drive at a medium speed. Do not exceed 50 kilometers per hour and do not lean against the roadside. Drive to prevent the subgrade from being crushed, the vehicle toppled over, causing major accidents, pay attention to the curvature of the road when turning, do not forcefully pass, and pay attention to the vehicle to prevent hanging up the wires hanging in the air. When the workover rig enters the well site, you must pay attention to the road and Pavement conditions at the well site to prevent vehicle subsidence.
Placement of the workover rig and erection of the derrick
First, level the well site and dig a rope pit according to the requirements of the manual. If the well needs to move the turntable, first set up the drill floor and the derrick base, and then set up the boat-shaped base. Move the power selection handle to the "Winch" position, start the engine, and when the air pressure reaches the specified pressure, engage the liquid pump, move the "Working Condition Selection" handle of the hydraulic system to the "Adjustment" position, and adjust the engine speed to 1100~1300 rpm Left and right, at this time, manipulate the control valve handles of the four outrigger cylinders in the six-way valve, level the vehicle, connect the rear of the vehicle with the coupling rod at the base of the derrick, untie all the stay ropes from the derrick, and carefully check the extension of the derrick. When there is no concern, then manipulate the derrick to lift the control valve handle of the hydraulic cylinder, open the needle valve handle when the pressure reaches 2Mpa, let the oil circulate for about 3 minutes, close the needle valve, and then open the exhaust cap on the top of the hydraulic cylinder to discharge Inflate until no air bubbles appear, close the exhaust cap, operate the handle, and slowly raise the derrick. When the derrick stands upright quickly, the operation must be slow, in case the derrick is lifted too fast, causing a fall-back accident, and the derrick should be raised immediately after it is in place. The connecting bolts of the derrick and the lower body must be careful not to hang anything on the wire rope during the lifting process of the derrick.
Before the upper section of the derrick is raised, check the suspension of each guy rope and exhaust the secondary shrinkage cylinder (the pressure of the hydraulic cylinder is about 1Mpa), and then manipulate the handle of the control valve of the telescopic hydraulic cylinder to slowly rise the upper section of the derrick to act as the first centralizer When it appears, the upper derrick stops rising, observe whether the centralizer is in place, the two centralizers should be on the same plane after being in place, and the derrick continues to rise until the second centralizer appears, and then observe whether the second centralizer is in place. When you reach the predetermined position, you should slow down the rising speed, and then rise 1030 mm after hearing a slight metal impact, and then manipulate the telescopic hydraulic cylinder control valve handle to make the upper section of the derrick slowly descend, and sit on the lock block. If you do not sit, the derrick Continue to descend, manipulate the telescopic hydraulic cylinder control valve handle to raise the derrick to the top position again, and then lower the derrick until the upper section of the derrick sits firmly, and immediately insert the safety plug and the plug of the derrick lighting lamp. At this time, the hydraulic system " Move the handle of "working mode selection" to the middle position, manipulate the control handle of the liquid pump to stop the liquid pump, and then pull the windproof guy rope until it is tight to the specified degree, and then pull the second floor guy rope and the load guy rope.For a workover rig with two engines, when one engine is working, the power output clutch of the other engine must be in a disengaged state.
The above operation process particularly emphasizes that the action should be gentle and not too hasty. The control handles should not be lifted and released violently.
Install ancillary equipment
Driller control box, walkway, guardrail, insert the positioning pins everywhere, and set up all escalators. Debugging and inspection equipment: the debugging and inspection equipment should be related to the safe operation of the equipment and the personal safety of the well site staff. Drill full-time responsible, check and test item by item.
1. Check the transmission shafts on the vehicle and whether the fastening bolts are tightened
2. Check each lubricating part and add lubricating oil and grease that meet the requirements in time
3. Check that the handles of the control valves of the liquid and gas lines are in a safe position, and whether the liquid and gas lines, joints, and instruments are loose and leaked
4. Check the rolling brake mechanism, whether the action is flexible and reliable 5), check whether the big rope is broken or flattened, etc.
Safety precautions for timely replacement of unqualified wire ropes
1. Before tripping out of the drill, check the anti-collision mechanism of the crown block, and the action must be sensitive, correct and reliable
2. Pay attention to concentrate when operating
3. The operation action should be stable, and it is forbidden to lift, release, brake, and pier
4. When the hanging weight of the hook reaches more than 300KN, auxiliary brakes (water brakes or disc brakes) should be used to reduce the hook’s descending speed and reduce the wear of brake pads and brakes.
5. The grid controls the lowering speed of the hook to prevent brake failure and cause pier drilling accidents
6. Reasonably select the gear position and lifting speed according to the hanging weight of the hook
7. Pay attention to observe the temperature of the circulating cooling water, the maximum shall not exceed 66°C
How to find a trustworthy workover rig supplier?
When it comes to choosing workover rig suppliers, procurement departments rely on a number of qualitative, quantitative, subjective and objective criteria.
1. Supplier cost
Probably the most obvious – but equally important – factor to take into consideration when looking for new suppliers, is cost.
Of course, you’ll have a figure in mind as you'll know which products you're looking for, and how much you’re willing to pay. Even so, prices between suppliers can vary, so it's important to shop around and see who offers the best deal. For instance, some suppliers may offer discounts on bulk-buying; or others may offset higher costs with better quality products.
You should weigh up all of the options when it comes to costs, before deciding which supplier is best in that respect.
There’s often a correlation between cost and quality: the more expensive the product, the better the quality. Regardless of price, there is still a predetermined, agreed level of quality, and you want to be sure that your expectations are met.
After all, the last thing you want to do is market your products as high-end, when your supplier sends you something completely different.
Quality doesn't just refer to the physical product itself, but its associated aspects too. Are the products packaged adequately, protecting them in transit? Are they labelled correctly? Speak with potential suppliers to ensure that you're fully aware of what they will offer you – you don't want to sign a contract and then be disappointed.
3. Reliability and previous experience
It's important to remember that when choosing a supplier, you're essentially entering into a long-term relationship with them. It's similar to hiring a new recruit – you'll want to see references.
Don't be afraid to ask for them: it makes sense that you would want to hear from businesses who have worked with specific suppliers in the past, as they can give you an honest account of what the partnership was like, and list any good or bad points.
If you're deciding between two suppliers, references can make all the difference when deciding who to choose.
Your chosen supplier will directly reflect upon your business. If they send over a batch of products two weeks late, the customer who ordered that product will blame you, not your supplier.
4. Shared culture
Expectations are only met when they are clear on both sides. A good supplier relationship is built on shared cultural goals and attitudes. Speak with suppliers directly to find out how they like to work with other businesses. If you want constant communication but they prefer to just “get on with it”, then realistically, that's not going to work.
Top-down view of people around a table on their laptops
When speaking with suppliers, whilst you'll have questions to ask them; it's likely they'll have equally as many questions for you. Use this time to gauge whether your culture and expectations are similar, as you should get a good idea of whether or not the relationship will work.
When choosing a supplier, location is a big factor to consider. If you're a local business that has built your brand on expertise in your area, then you'll want to focus on finding a supplier who is located nearby, and shares your values.
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