Completion and fracture integrated pipe column of offshore openhole horizontal well and construction method of pipe column

Abstract

The invention relates to a completion and fracture integrated pipe column of an offshore openhole horizontal well and a construction method of the pipe column. The pipe column comprises a casing pipe, a bottom completion pipe column and a top tie-back pipe column, wherein the top tie-back pipe column comprises a plurality of stages of fracture construction groups, except a first stage of fracture construction group, each stage is provided with more than two sliding sleeves for providing fracturing fluid jetting outlets, the fracturing number is large, and two packers are arranged at two ends for sealing and isolating. Besides, a safety valve, a top packer and a circulating valve are further arranged on a tie-back oil pipe of the top tie-back pipe column; the safety valve is arranged in the position close to a well mouth and connected with a control terminal on the ground; the top packer is located between the safety valve and a hydraulic anchor; and the circulating valve is located between the hydraulic anchor and the top packer. According to the completion and fracture integrated pipe column of the offshore openhole horizontal well and the construction method of the pipe column, the fracture number of each fracture construction section multiplies under the condition that drop balls are not increased, so that the refining degree of fracture is improved, and oil or gas yield is increased; and meanwhile, requirements and limitation of offshore operation for safety and environment protection are met.

Description

technical field [0001] The present invention relates to an open-hole horizontal well completion and fracturing integrated pipe string and a construction method thereof, in particular to an open-hole horizontal well completion and fracturing integrated pipe string suitable for offshore fracturing construction and a construction method thereof. Background technique [0002] Open-hole horizontal well staged fracturing technology is a low-permeability oilfield stimulation technology, which has a wide market demand. This technology suspends tools in the open hole section by hanging packers, including open hole packers, sliding sleeves, seating ball seats, floating shoes, etc., and divides the horizontal section into several sections to achieve separate fracturing and simultaneous production. The tie-back string includes an insertion seal and a hydraulic anchor. The insertion seal is inserted into the tie-back sealing cylinder of the hanging packer to realize the tubing tie-back, ...

AI Technical Summary

Problems solved by technology

However, the offshore fracturing construction is limited by many factors such as safety, environmental protection, and platform site conditions, and it is impossible to fully use the existing open-hole horizontal well segmented strings on land for fracturing construction.

In addition, the above-mentioned open-hole horizontal well completion and fracturing integrated string, due to the use of ordinary sliding sleeves in the fracturing process, is limited by the number of pitching balls, and the technology cannot meet the refined stimulation requirements of the reservoir.

Moreover, during the construction and production process, the above-mentioned integrated pipe pile shut-in is controlled by the gate valve of the Christmas tree, which has certain risks.

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