Well killing method using solid water particles as kill fluid

Abstract

The invention is a well killing method using solid water particles as well killing liquid, its character: making according to the steps: 1, prepare clear water or salt water; 2, add in the drugs such as corrosion inhibitor, discharging assistant, clay stabilizing agent, etc, to protect oil-gas well; 3, add in solidification initiator and colloid protective agent; 4, add in strong water absorbing resin material to fully and uniformly mix to form solid particles; 5, press the solid particles into the well tube by slurry pump or crusher in a forward or reverse circulating mode; 6, after killing well, circulate a cycle, observe for 48 hours, and when the well is stable, open well mouth to make underpit construction; 7, discharge the solid particles in the well tube by pumping or air lifting, etc, and put into production.

Description

Technical field: [0001] The invention relates to an oil and gas well isolation method, in particular to a well killing method using solid water particles as well killing fluid. Background technique: [0002] As we all know, after the oil and gas well is drilled, the production layer is opened through perforation and ejection to connect the production layer with the wellbore, so that oil or natural gas can be produced through the wellbore smoothly. However, after the perforating projectile produces production layers, the wellbore and the surface wellhead still need to carry out some work, such as pulling out the perforating gun, lowering the production string, installing downhole tools, etc. The liquid is used to fill the entire wellbore, so that the oil and gas in the production layer will not be ejected from the ground immediately after the production layer is shot, and the oil and gas well will not be out of control. In addition, after the oil and gas well has been in ope...

AI Technical Summary

Problems solved by technology

For example, if the drilling mud kills the well, the solid phase substances in the mud enter the production layer to block the oil and gas channels, and are lost to the production layer, causing damage to the production layer, or even permanent pollution, which greatly reduces the productivity of a single well; inorganic salt water well killing, inorganic salt water is inevitable The ground will be lost to the production layer, causing certain damage to the production layer, and at the same time, it will corrode the downhole oil and gas casing; clean water well killing is to continuously inject clean water into the wellbore during the well killing and workover process to ensure that the wellbore is formed in the wellbore. The pressure difference is used to prevent blowout. In this way, the longer the operation time, the more clean water will leak into the production layer. Generally, the amount of clear water leakage from a well operation ranges from a few hundred cubic meters to thousands of square meters, and a large amount of clean water is submerged. In the production layer, the minerals in the production layer expand, block the production layer, and cause damage to the production layer. Often the original production capacity cannot be restored after operation, which seriously affects economic benefits; foam well killing is to use surfactant and nitrogen on the ground to generate foam through special equipment The technology of reinjecting the wellbore, but its stable time is short, and it often takes multiple well kills to complete the construction of a well, and the uniformity is poor. There are also disadvantages such as high cost and serious environmental pollution.

Moreover, the above-mentioned technology cannot solve the problem of well killing when there are two production layers with different pressure coefficients in the same well.