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Water base fracturing and blocking-removing composite process

A composite process and water-based fracturing technology, which is applied in the direction of drilling composition, production fluid, wellbore/well components, etc., can solve the problems of increasing construction unsafety, affecting the effect of plugging removal, and decreasing the use concentration. Achieve the effect of wide range of blocking, effective effect of blocking, and reduction of damage

Inactive Publication Date: 2012-06-20
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problems existing in the technology are: when the isolation layer is too thick, the construction safety is guaranteed, but the use concentration of HRS and acid solution decreases, which affects the plugging removal effect; when the isolation layer is too thin, the concentration of the plugging agent can be guaranteed, but the HRS Rapid contact with acid at the wellhead and a violent reaction will occur, causing the risk of explosion, which increases the safety of construction; in addition, the HRS acidic plugging removal system is not suitable for the stimulation of acid-sensitive reservoirs, and the affected area in the well is small, which affects understanding Blocking effect

Method used

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  • Water base fracturing and blocking-removing composite process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Step 1. Add HRS compound plugging agent into the water, stir well, then add clay stabilizer potassium chloride and demulsification and drainage aid CF-5C (produced by Changqing underground chemical factory in Qingyang, Gansu Province), stir well and then add Hydroxypropyl guar gum, stir 10min to obtain former glue solution; The mass concentration of hydroxypropyl guar gum in the described former glue solution is 0.1%, and the mass concentration of clay stabilizer is 0.5%, and the mass concentration of demulsification aid-drainage agent is 0.1%, the mass concentration of compound plugging agent HRS is 0.1%;

[0026] Step 2, mixing the original gum solution and the crosslinking agent described in step 1 at a volume ratio of 100:6 and then stirring evenly to obtain a fracturing fluid; the crosslinking agent is a mixed aqueous solution of sodium tetraborate and ammonium persulfate, The mass concentration of sodium tetraborate in the crosslinking agent is 0.4%, and the mass ...

Embodiment 2

[0029] Step 1. Add HRS compound plugging agent into the water, stir well, then add clay stabilizer potassium chloride and demulsification and drainage aid CF-5C (produced by Changqing underground chemical factory in Qingyang, Gansu Province), stir well and then add Hydroxypropyl guar gum, stir 20min to obtain former gum solution; The mass concentration of hydroxypropyl guar gum in the described former gum solution is 1%, and the mass concentration of clay stabilizer is 2.5%, and the mass concentration of demulsification aid-drainage agent is 1%, the mass concentration of composite plugging agent HRS is 0.5%;

[0030] Step 2, mixing the original gum solution and the cross-linking agent described in step 1 at a volume ratio of 100:10 and stirring evenly to obtain a fracturing fluid; the cross-linking agent is a mixed aqueous solution of sodium tetraborate and ammonium persulfate, The mass concentration of sodium tetraborate in the crosslinking agent is 1%, and the mass concentra...

Embodiment 3

[0033] Step 1. Add HRS compound plugging agent into the water, stir well, then add clay stabilizer potassium chloride and demulsification and drainage aid CF-5C (produced by Changqing underground chemical factory in Qingyang, Gansu Province), stir well and then add Hydroxypropyl guar gum, stir 10min to obtain former gum solution; The mass concentration of hydroxypropyl guar gum in the described former gum solution is 0.3%, and the mass concentration of clay stabilizer is 1%, and the mass concentration of demulsification aid-drainage agent is 0.3%, the mass concentration of compound plugging agent HRS is 0.2%;

[0034] Step 2, mixing the original gum solution and the crosslinking agent described in step 1 at a volume ratio of 100:6 and then stirring evenly to obtain a fracturing fluid; the crosslinking agent is a mixed aqueous solution of sodium tetraborate and ammonium persulfate, The mass concentration of sodium tetraborate in the crosslinking agent is 0.6%, and the mass conc...

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Abstract

The invention discloses a water base fracturing and blocking-removing composite process. The process comprises the following steps of: 1, adding a composite blocking remover in water, after uniformly stirring, sequentially adding a clay stabilizer and an emulsion breaking cleanup additive, after uniformly stirring, adding hydroxylpropyl guar gum into the mixture, and stirring for 10 to 20 minutes to obtain crude glue solution; 2, mixing the crude glue solution with a cross-linking agent according to a volume ratio of 100:(6-10), and uniformly stirring to obtain fracturing fluid; and 3, injecting the fracturing fluid, an initiator and a conventional fracturing propping agent into an oil well together, wherein chlorine dioxide in the composite blocking remover is released from the composite blocking remover through the initiation of the initiator, and blocking removing is realized while the fracturing is realized. The process has the advantages of simple construction process, high operation efficiency, low cost, wider blocking-removing range and the like. While the conventional water base fracturing process is not changed, the two processes of fracturing and blocking removing are effectively combined, the dual effects of fracturing and blocking removing are achieved while one kind of operation is performed, and the damage of the operation to a storage layer is lessened.

Description

technical field [0001] The invention belongs to the technical field of petroleum, and in particular relates to a composite technology of water-based fracturing and plugging removal. Background technique [0002] Fracturing injures reservoirs while increasing the productivity of oil and gas wells. For the damage caused by fracturing fluid residue and incomplete foot breaking, technologies such as microbial plugging removal, HRS composite plugging removal, and plugging removal agent injection before and after fracturing are generally adopted to remove plugging. Among them, HRS composite plugging removal technology has the best effect. The existing HRS plugging removal technology uses acid as the initiator. When the acid and HRS meet, the reaction speed is very fast. Generally, the alternate injection process of "HRS + isolated water + hydrochloric acid" is used to remove the plugging of the target layer. The problems existing in the technology are: when the isolation layer i...

Claims

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Application Information

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IPC IPC(8): E21B43/267C09K8/68
Inventor 王满学
Owner XI'AN PETROLEUM UNIVERSITY
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