Oil gas well completion temporary blocking liner tube

Abstract

The invention relates to an oil and gas well completion temporary plugging lining pipe, which is used for the under-balanced well completion after under-balanced drilling, belonging to the field of whole process under-balanced drilling well completion snubbing manufacturing technology. Based on the characteristic that temporary plugging agent can melt under high temperature, the invention designs an oil and gas well completion temporary plugging lining pipe which has an upper joint and a lower joint, and is equipped with through sieve pores with temporary plugging agent inside on the pipe body, solves the problem that a tail pipe is perforated in the prior art, resulting in tail pipe deformation, and is in an unfixed state in a well, bringing in trouble to subsequent works, the sieve pores of the temporary plugging lining pipe are processed on the ground, thus the temporary plugging lining pipe has the characteristics of convenient process and deformation improbability, a different binder can be selected in accordance with a different well depth to implement temporary plugging, after the lining pipe is put in the well, the temporary plugging agent can melt slowly when the temperature in the well reaches to a preset value, thus a temporary lining pipe having sieve pores can be obtained.

Description

Technical field: [0001] An oil and gas well completion temporary plugging liner is used for underbalanced drilling and completion after underbalanced drilling, and belongs to the technical field of design and manufacture of underbalanced drilling and completion pipe strings in the whole process. Background technique: [0002] At present, underbalanced drilling, snubbing and tripping under pressure, underbalanced coring, and snubbing and pressure logging in the whole process of underbalanced drilling technology have become increasingly mature, but the underbalanced completion method is still Relatively simple, the main completion methods are open hole completion and liner completion. The open hole completion method has the advantages of fast and economical, but its disadvantages are: it can only be implemented in the harder layers of underground rock, and Open hole completion in soft and loose formations will lead to wellbore collapse and eventually make the wellbore unusable...

AI Technical Summary

Problems solved by technology

[0002] At present, underbalanced drilling, snubbing and tripping under pressure, underbalanced coring, and snubbing and pressure logging in the whole process of underbalanced drilling technology have become increasingly mature, but the underbalanced completion method is still Relatively simple, the main completion methods are open hole completion and liner completion. The open hole completion method has the advantages of fast and economical, but its disadvantages are: it can only be implemented in the harder layers of underground rock, and Open hole completion in soft and loose formations will lead to wellbore collapse and eventually make the wellbore unusable; using liner to complete the well without cementing is a common way at present, but it needs to be well cleaned. The perforated pipe is used to make it a liner with holes so that the downhole oil and gas resources can enter the tubing and be recovered to the surface. Well cementing is in an unfixed state and is not centered in the well. This will cause the pin of the one-way constant pressure joint of the tubing to be lowered in the future. It has brought trouble to the follow-up work. A patent application with the patent application number 200520113354.3 discloses a well completion device for underbalanced well completion. The patent is to pre-cut non-penetrating bar shafts on the circular pipe The circular pipes cut with strip-shaped grooves are lowered into the well, and then the non-penetrating strip-shaped axial grooves are expanded by the expander to become a penetrating screen tube, which plays the role of blocking the downhole sediment. , however, in practical applications, this technology needs to be lowered into the hanger first, and the hanger and the casing are sealed together. Due to the roundness tolerance and dimensional tolerance of the connecting part between the casing and the hanger, it is difficult The seal was in place, and thus caused the hanger to fail to hang. The failure of the hanger to set caused the pipe with the non-penetrating bar axial groove to fail to hang in the well. During the test, occasionally the hanger was set. However, when the expander is lowered to unscrew the non-penetrating strip axial groove, due to the friction between the expander and the pipe string, the higher temperature will cause the stick shaft of the expander to stick to the pipe string, making it impossible to extract the oil from the well. The drilling tool is raised, which eventually leads to the scrapping of the wellbore. In addition, the cut non-penetrating strip axial groove will greatly reduce the strength of the pipe string, and it will be deformed when encountering irregularities in the wellbore

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