Temperature-control rigid expansion plugging working fluid for drilling fluid

Abstract

The invention relates to a temperature-control type rigid expansion plugging working fluid for a drilling fluid for a fractured leakage layer in the technical field of leakage prevention and plugging of the drilling fluid. The temperature-control type rigid expansion plugging working fluid comprises the following components in parts by weight: 100 parts of leaking stoppage base slurry, 5-10 parts of a temperature-control rigid expansion leaking stoppage agent, 10-20 parts of rigid particles, 4-10 parts of elastic particles, 2-5 parts of a flaky material and 0.2-0.4 part of a fiber material, and is compounded by optimizing the functions and particle sizes of the components. A temperature control type rigid expansion material serves as a core, deformation is generated through temperature induction excitation at a leakage channel to achieve bridging and blocking, rigid blocking materials and elastic blocking materials which are different in particle size and shape are cooperated, and a dense pressure-bearing blocking layer which is of a strong chain network structure and is high in self-adaptive capacity, high in temperature resistance, high in pressure-bearing capacity and low in leakage amount is formed, 3-5mm large opening of fractured leakage is sealed, the activation temperature can be adjusted from 70 DEG C to 100 DEG C, the pressure bearing capacity is larger than or equal to 20 MPa, and the leakage amount is smaller than or equal to 100 mL.

Description

Technical field: [0001] The invention belongs to the new technical field of leakage prevention and plugging in petroleum drilling engineering, and in particular relates to a temperature-controlled rigid expansion plugging working fluid for drilling fluid in the drilling process. Background technique: [0002] Lost circulation refers to the phenomenon that wellbore working fluid (including drilling fluid, cement slurry, completion fluid, etc.) leaks into the formation under the action of pressure difference during downhole operations such as drilling, cementing, and testing. [0003] At present, the most effective method to deal with fracture leakage is the bridging plugging method. The bridging plugging method relies heavily on the knowledge of the lost channels in the formation and the reasonable compounding of materials. Traditional bridging plugging materials do not have self-adaptive properties. With the continuous development of oil drilling to the stage of informatiza...

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Problems solved by technology

[0005] Chinese patent (publication number: CN 108239531) discloses a plugging agent composed of shape memory foam, fibrous plugging material, filling material and suspension stabilizer. The activation temperature of the shape memory material is not introduced, and no crack plugging is performed. Evaluation

The shape-memory particles include: hollow high-elastic foam sponge and its coated temperature-sensitive shape-memory polymer; the content of the temperature-sensitive shape-memory polymer is 20-99.99wt% of the shape-memory particles; the particle size of the shape-memory particles is less than Or equal to 8mm, added to the cementing slurry, stimulated by a suitable downhole temperature rise environment, expands several times in volume, uses the volume steric effect to seal rock cracks, and is an anti-polymer shape memory material Strong sealing capacity, but relatively insufficient pressure bearing capacity

[0008] Therefore, the existing polymer shape memory plugging agents have unknown activation temperature or low activation temperature and low pressure bearing capacity, while alloy shape memory plugging agents have larger particle size, complex ball forming process, and narrow application range. It is not suitable for leak prevention and plugging while drilling; at the same time, it lacks the corresponding matching plugging fluid formula and its fracture sealing effect, as well as the field practical application of shape memory plugging agent in drilling and plugging

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