Water Shutoff Through Fullbore Placement of Polymer Gel in Faulted and in Hydraulically Fractured Producers of the Prudhoe Bay Field

Lane, Robert H.; Sanders, G.S.

doi:10.2118/29475-ms

Cited by 33 publications

(4 citation statements)

References 8 publications

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“…Field cases exist where a partially formed or fully formed (mature) gel of the classical type was extruded down the length of the well and into a fracture (Lane and Seright 2000;Lane and Sanders 1995). Horizontal wells often intersect fractures that lead to an aquifer.…”

Section: Fractured Wellsmentioning

confidence: 99%

When and Where Relative Permeability Modification Water-Shutoff Treatments Can Be Successfully Applied

Sydansk¹,

Seright

2007

SPE Production &Amp; Operations

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This paper provides guidance on when and where relativepermeability-modification/disproportionate-permeability-reduction (RPM/DPR) water-shutoff (WSO) treatments can be successfully applied for use in either oil or gas production wells. When properly designed and executed, these treatments can be successfully applied to a limited range of oilfield excessive-water-production problems. When these treatments are applicable, they may be placed using bullhead injection (not requiring mechanical zone isolation)-a very favorable feature. However, there are a substantial number of limitations and possible pitfalls relating to the successful application of RPM/DPR WSO treatments. First-time application by an inexperienced operator should be considered a somewhat high-risk undertaking. In order to successfully treat unfractured production wells (i.e., radial flow through matrix rock into the well) that are fully drawn down, the oil and water zones should not be in pressure communication and the oil-producing zone(s) must be producing at 100% oil cut (dry oil). When treating unfractured and multizoned production wells that are not fully drawn down, the well's long-term oil-production rate can be increased if the post-treatment drawdown is increased substantially. Treatments that promote short-term (transient) decreased water/oil ratios can, in principle, be applied to many unfractured production wells (that are not totally watered out) in matrix-rock reservoirs. However, these latter treatments must be custom designed and engineered on a well-by-well basis. Furthermore, for most wells, the performance and the economics of such transient WSO treatments are generally marginal. An attractive application of RPM/ DPR WSO treatments is the use of robust pore-filling gels in the matrix reservoir rock that is adjacent to a fracture(s) when oil and water is being co-produced into the treated fracture. Zitha et al. 1999;Al-Sharji et al. 1999;Elmkies et al. 2001;Stavland and Nilsson 2001;Grattoni et al. 2001;Seright et al. 2002;Willhite et al. 2002). More recently, a plausible mechanism was proposed that explains how chromium(III)-carboxylate/acrylamidepolymer (CC/AP) gels impart DPR (Seright et al. 2006). A detailed discussion of the mechanism by which water-soluble polymers and aqueous polymer gels impart RPM/DPR is beyond the scope of this paper. Historically, a large number of ineffective, underperforming, and/or disappointing RPM/DPR water-shutoff treatments were applied by the petroleum industry (Eoff et al.

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Section: Fractured Wellsmentioning

confidence: 99%

When and Where Relative Permeability Modification Water-Shutoff Treatments Can Be Successfully Applied

Sydansk¹,

Seright

2007

SPE Production &Amp; Operations

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“…In this case, the goal would be to plug the fracture without damaging Fig. 9 Fracture leading from a horizontal production well down to an aquifer those parts of the horizontal well in the remainder of the oil zone (Lane and Sanders 1995;O'Brien et al 1999). Gels are the most effective means that we currently have to treat excess water production through fractures (Borling 1994;Hild and Wackowski 1999;Lane and Sanders 1995;O'Brien et al 1999;Sydansk and Moore 1992;Sydansk and Southwell 2000).…”

Section: Diagnosismentioning

confidence: 99%

“…9 Fracture leading from a horizontal production well down to an aquifer those parts of the horizontal well in the remainder of the oil zone (Lane and Sanders 1995;O'Brien et al 1999). Gels are the most effective means that we currently have to treat excess water production through fractures (Borling 1994;Hild and Wackowski 1999;Lane and Sanders 1995;O'Brien et al 1999;Sydansk and Moore 1992;Sydansk and Southwell 2000). Cement cannot penetrate into narrow fractures, and in wide fractures, gravity segregation makes the cement drop to the lower part of the fracture-leaving the upper part open (Seright 1995a;Seright et al 2003).…”

Section: Diagnosismentioning

confidence: 99%

Water shutoff and conformance improvement: an introduction

2021

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This paper provides an introduction to the topic of water shutoff and conformance improvement. After indicating the volumes of water produced during oilfield operations, a strategy is provided for attacking excess water production problems. Problem types are categorized, typical methods of problem diagnosis are mentioned, and the range of solutions is introduced for each problem type. In the third section of the paper, the concept of disproportionate permeability reduction is introduced—where polymers and gels may reduce permeability to water more than to oil or gas. When and where this property is of value is discussed. The fourth section describes the properties of formed gels as they extrude through fractures and how those properties can be of value when treating conformance problems caused by fractures. Section 5 covers the efficiency with which gels block fractures after gel placement—especially, the impact of fluids injected subsequent to the gel treatment.

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“…The parameter design of injection well profile control and oil displacement (PCOD) scheme plays an important role in improving the water drive effect and enhancing the oil field production and recovery. 1,2 The effect of PCOD is affected by many factors. Injection rate is one of the important factors to ensure the stable and balanced rise of block pressure.…”

Section: ■ Introductionmentioning

confidence: 99%

Optimization of Profile Control and Oil Displacement Scheme Parameters Based on Deep Deterministic Policy Gradient

Tan

Wang

Tian³

et al. 2023

ACS Omega

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The parameter design of profile control and oil displacement (PCOD) scheme plays an important role in improving waterflooding efficiency and increasing the oil field production and recovery. In this paper, the parameter optimization model and solution method of the PCOD scheme based on deep deterministic policy gradient (DDPG) are constructed with the half-year increased oil production (Q i ) of injection well group as the objective function and the parameter range of PCOD system type, concentration, injection volume, and injection rate as constraints. Using the historical data of PCOD and extreme gradient boosting (XGBoost) method to construct a proxy model of PCOD process as the environment, the change rate of Q i of well groups before and after optimization is taken as the reward function; the system type, concentration, injection volume, and injection rate are taken as the action; and the Gaussian strategy with noise is taken as the action exploration strategy. Taking XX block of offshore oil field as an example, the parameters of the compound slug PCOD process (pre-slug + main slug + protection slug) of the injection well group are analyzed, that is, parameters such as the system type, concentration, injection volume, and injection rate of each slug system are optimized. The research shows that the parameter optimization model of the PCOD scheme established based on DDPG can obtain higher oil production PCOD scheme for well groups with different PCOD, and has strong optimization and generalization ability compared with the particle swarm optimization (PSO) model.

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Water Shutoff Through Fullbore Placement of Polymer Gel in Faulted and in Hydraulically Fractured Producers of the Prudhoe Bay Field

Cited by 33 publications

References 8 publications

When and Where Relative Permeability Modification Water-Shutoff Treatments Can Be Successfully Applied

When and Where Relative Permeability Modification Water-Shutoff Treatments Can Be Successfully Applied

Water shutoff and conformance improvement: an introduction

Optimization of Profile Control and Oil Displacement Scheme Parameters Based on Deep Deterministic Policy Gradient

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