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Acid-soluble composite plugging agent and application thereof

A plugging agent and acid-soluble technology, which is applied in the petrochemical field, can solve problems such as reservoir protection without consideration, and achieve the effects of high rigidity, high strength, and improved pressure bearing capacity

Active Publication Date: 2014-10-29
新疆华油能源工程服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above lost circulation agents mainly consider the treatment effect on lost circulation, and do not consider the protection of reservoirs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Take 40kg of shellfish particles, 20kg of pre-crosslinked gel body swelling particle regulating agent RGT-14 (manufactured by Tianjin Runge Auxiliary Technology Co., Ltd., and implement the standard Q / 12JH 5180-2013), fiber material (the 30kg of fiber particles, whose particle size range is 0.38-0.83mm), 10kg of limestone powder (calcium carbonate content is more than 90%wt), after mechanical mixing, mix well with drilling fluid 5 times the mass of the mixture, and then, if necessary, Add appropriate amount of surfactant, fluid loss reducer, viscosifier, bentonite and mineral fibers such as sepiolite, vermiculite, mica flakes, etc. to prepare a plugging slurry for drilling plugging. There are three basic components of the plugging agent. The first is shellfish particles, including particles of various shellfish, clam crabs, conchs and other shells that have been crushed. The particles have high acid solubility and high hardness, and can be used as plugging Rigid bridgin...

Embodiment 2

[0035] Take 30kg of shellfish particles, pre-crosslinked gel body expansion particle control agent (by polyacrylamide and bentonite under the action of crosslinking agent, use functional groups such as silicon hydroxyl groups on the surface of bentonite particles and amide groups of polyacrylamide molecules to condense Prepared by cross-linking reaction, wherein the mass ratio of polyacrylamide and bentonite is 1:3) 25kg, fiber material (fiber particles after crushing waste newspapers, the particle size range is 0.38-0.83mm) 35kg, limestone powder (calcium carbonate content of more than 90%wt) 10kg, after mechanical mixing, mix well with drilling fluid 6 times the mass of the mixture, and add appropriate amount of surfactant, fluid loss reducer, viscosity enhancer, bentonite and mineral fiber as needed Sepiolite, vermiculite, mica flakes, etc. are prepared into plugging slurry for drilling plugging.

Embodiment 3

[0037] Take 20kg of shellfish particles, 30kg of pre-crosslinked polyacrylamide, 35kg of fiber material (fiber particles after crushing waste newspapers, the particle size range is 0.42-0.83mm), limestone powder (calcium carbonate content is more than 90%wt) 15kg, after mechanical mixing, mix well with drilling fluid 8 times the mass of the mixture, and add appropriate amount of surfactant, fluid loss reducer, viscosifier, bentonite and mineral fibers such as sepiolite, vermiculite, Mica flakes are prepared into plugging slurry for drilling plugging.

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Abstract

The invention discloses an acid-soluble composite plugging agent which mainly comprises shell particles, pre-crosslinked gel expanded particles, fiber materials and lime stone powder. The invention further provides application of the acid-soluble composite plugging agent in treatment of reservoir leakage in a drilling process. According to the invention, when being used for treating the reservoir leakage in the drilling process, the acid-soluble composite plugging agent disclosed by the invention is uniformly mixed with drilling fluid in a mass ratio of 1:(2-9) to prepare plugging slurry for plugging in the drilling process. The shell particles are high in acid solubility and greater in hardness, and can be applied as rigid bridge-binding particles in the plugging agent; expanding volume of polymer particles is continuously increased along with prolonging of water absorbing time; the fiber materials can be used for changing a fractured leaking channel into a pored leaking channel by virtue of bridge binding action. The secondary component is acid-soluble lime stone powder which can further fill up small gaps of a blocking all formed by the three materials, so that compactness and strength of the building wall are further increased to finally form the compact and high-strength blocking wall.

Description

technical field [0001] The invention belongs to the petrochemical field, and relates to a drilling fluid treatment agent in petroleum drilling engineering, in particular to a preparation method of an acid-soluble composite plugging agent for drilling fluid. Background technique [0002] In oil and gas drilling, lost circulation is a downhole complex situation often encountered in the drilling process. At present, the treatment of lost circulation usually adopts the method of prevention and plugging. For formations prone to lost circulation, anti-leakage materials while drilling are added to the drilling fluid in advance to prevent porosity leakage and prevent small leaks from becoming big leaks. For formations that have already lost circulation, especially large-scale lost circulation where drilling fluid can only enter and exit, it is necessary to stop drilling for special plugging. There are many conventional plugging materials, such as bridging plugging agent, cementing ...

Claims

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Application Information

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IPC IPC(8): C09K8/42
CPCC09K8/03C09K8/426C09K2208/04C09K2208/08
Inventor 王富华王德兴刘浩蔡德利李雪雨
Owner 新疆华油能源工程服务有限公司
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