Calcium-based brine polymer strong-inhibition environment-friendly drilling fluid base fluid, drilling fluid as well as preparation and application of drilling fluid

A drilling fluid and polymer technology, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of drilling fluid not flowing, environmental protection is difficult to meet standards, drilling fluid rapid slurrying, etc., to achieve the ability to inhibit plugging Strong, keep the well wall clean and prevent the coal seam from collapsing

Active Publication Date: 2021-11-02
洲际海峡能源科技有限公司 +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Aiming at the drilling areas of tight oil in the eastern Junggar Basin oilfield and Changji Oilfield of Xinjiang Oilfield Branch Company, especially the 1700m shallow well in the fault block of Well Ji 8 in the Ji 7 well area of ​​Changji Oilfield, the technical difficulties existing in the drilling operation after the second opening: such as Neogene , Paleogene water-sensitive formation mudstone, gypsum rock and gypsum mudstone are easy to hydrate, expand, and disperse when exposed to water, resulting in rapid slurrying of drilling fluid, performance pollution, poor fluidity, and even a vicious cycle. Fluid flow does not move, causing downhole complications such as diameter shrinkage and drill sticking, and frequent accidents; Xishanyao formation coal seams are well developed, and it is easy to cause downhole collapse and drill sticking; repeated flushing and discharging of drilling fluid causes the cost of drilling fluid to exceed the design cost , causing the cost of single well drilling fluid to remain high
The existence of these technical problems shows that the natural polymer drilling fluid system and potassium-based brine polymer drilling fluid system currently used in drilling operations in this block can no longer meet the needs of drilling construction in this block
Although oil-based drilling fluid can solve the above problems, it has the problems of high cost, serious pollution, and difficulty in meeting environmental protection standards

Method used

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  • Calcium-based brine polymer strong-inhibition environment-friendly drilling fluid base fluid, drilling fluid as well as preparation and application of drilling fluid
  • Calcium-based brine polymer strong-inhibition environment-friendly drilling fluid base fluid, drilling fluid as well as preparation and application of drilling fluid
  • Calcium-based brine polymer strong-inhibition environment-friendly drilling fluid base fluid, drilling fluid as well as preparation and application of drilling fluid

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Embodiment 1

[0149] This embodiment provides a calcium-based brine polymer strong inhibition environment-friendly drilling fluid base fluid, denoted as 1# base fluid, wherein, the total volume of pre-hydrated sodium bentonite slurry is used as the calculation basis, and the base fluid includes pre-hydrated sodium bentonite slurry Sodium hydrate bentonite slurry, 2wt / v% high temperature resistant starch fluid loss reducer SHR-1, 0.6wt / v% sulfonate copolymer fluid loss reducer DSP-1, 0.6wt / v% low viscosity copolymer PANS flow regulator, 7wt / v% calcium-based oligosalt and 0.3wt / v% NaOH, wherein the concentration of sodium bentonite in the prehydrated sodium bentonite slurry is 3wt / v%;

[0150] Wherein, the calcium-based oligosalt is composed of CaCl 2 , CaCO 3 The compound formed after mixing with low-viscosity carboxymethyl cellulose sodium salt, based on the total weight of the compound as 100%, it comprises 40wt% low-viscosity carboxymethyl cellulose sodium salt, 50wt% CaCI 2 and 10 wt%...

Embodiment 2

[0152] This embodiment provides a calcium-based brine polymer strong inhibition environment-friendly drilling fluid base fluid, which is denoted as 2# base fluid, wherein the total volume of prehydrated sodium bentonite slurry is used as the calculation basis, and the base fluid includes pre-hydrated sodium bentonite slurry. Sodium hydrate bentonite slurry, 2wt / v% high temperature resistant starch fluid loss reducer SHR-1, 1wt / v% sulfonate copolymer fluid loss reducer DSP-1, 1wt / v% low viscosity copolymer PANS flow regulator, 10wt / v% calcium-based oligosalt and 0.3wt / v% NaOH, wherein the concentration of sodium bentonite in the prehydrated sodium bentonite slurry is 2wt / v%;

[0153] Wherein, the calcium-based oligosalt is composed of CaCl 2 , CaCO 3 The compound formed after mixing with low-viscosity carboxymethyl cellulose sodium salt, based on the total weight of the compound as 100%, it comprises 40wt% low-viscosity carboxymethyl cellulose sodium salt, 50wt% CaCI 2 and 1...

Embodiment 3

[0155] This embodiment provides a calcium-based brine polymer strong inhibition environment-friendly drilling fluid base fluid, denoted as 3# base fluid, wherein, taking the total volume of clean water as the basis for calculation, the base fluid includes clean water, 0.2wt / v %Na 2 CO 3 , 3wt / v% sodium bentonite, 2wt / v% high temperature resistant starch fluid loss reducer SHR-1, 1.5wt / v% sulfonate copolymer fluid loss reducer DSP-1, 1.5wt / v% Low-viscosity copolymer PANS flow regulator, 10wt / v% calcium-based oligosalt and 0.3wt / v% NaOH;

[0156] Wherein, the calcium-based oligosalt is composed of CaCl 2 , CaCO 3 The compound formed after mixing with low-viscosity carboxymethyl cellulose sodium salt, based on the total weight of the compound as 100%, it comprises 40wt% low-viscosity carboxymethyl cellulose sodium salt, 50wt% CaCI 2 and 10 wt% CaCO 3 .

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Abstract

The invention provides a calcium-based brine polymer strong-inhibition environment-friendly drilling fluid base fluid, a drilling fluid as well as preparation and application of the drilling fluid. The base fluid comprises base slurry, calcium-based oligomeric salt, a filtrate reducer, a flow pattern regulator and sodium hydroxide, wherein the base slurry comprises pre-hydrated sodium bentonite slurry or slurry formed from clear water, sodium carbonate and sodium bentonite. Based on the total volume of the pre-hydrated sodium bentonite slurry or clear water in the slurry as a calculation reference, the use amount of the calcium-based oligomeric salt is 2-20 wt/v%, the use amount of the filtrate reducer is 0.8-4.5 wt/v%, the use amount of the flow pattern regulator is 0.5-2 wt/v%, and the use amount of sodium hydroxide is 0.3-0.5 wt/v%. The calcium-based oligomeric salt is a compound formed from a calcium salt and a low-viscosity sodium carboxymethyl cellulose salt. The drilling fluid comprises the base fluid and a blocking agent, and the use amount of the blocking agent is 1.2-5wt/v% based on the total volume of the base fluid.

Description

technical field [0001] The invention relates to a calcium-based brine polymer strong inhibition environment-friendly drilling fluid base fluid, drilling fluid and its preparation and application, and belongs to the technical field of petroleum exploitation. Background technique [0002] Aiming at the drilling areas of tight oil in the eastern Junggar Basin oilfield and Changji Oilfield of Xinjiang Oilfield Branch Company, especially the 1700m shallow well in the fault block of Well Ji 8 in the Ji 7 well area of ​​Changji Oilfield, the technical difficulties existing in the drilling operation after the second opening: such as Neogene , Paleogene water-sensitive formation mudstone, gypsum rock and gypsum mudstone are easy to hydrate, swell, and disperse when exposed to water, resulting in rapid slurrying of drilling fluid, performance pollution, poor fluidity, and even a vicious cycle. Fluid flow does not move, causing downhole complications such as diameter shrinkage and dril...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/20C09K8/24
CPCC09K8/206C09K8/24C09K2208/10Y02P20/141
Inventor 段明祥张福祥李志斌胡强
Owner 洲际海峡能源科技有限公司
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